CN218731339U - Power battery top cap and power battery - Google Patents

Abstract

The utility model provides a power battery top cap and power battery. The power battery top cover comprises a top cover plate and a first pole unit arranged on the top cover plate. The first pole unit comprises a first pole, a sealing element and an upper insulating element. The top cover plate is provided with a first mounting hole, the first pole column penetrates through the first mounting hole and is fixedly mounted in the first mounting hole through the sealing element, and the peripheral wall of the first pole column is provided with an annular groove. Go up insulating part and include split type first insulating part and second insulating part, first insulating part and second insulating part all are equipped with the slope structure in relative one end. The first insulating part and the second insulating part are clamped on the outer peripheral wall of the first pole column through the sliding effect of the slope structure in the annular groove. The upper insulating part and the first pole are clamped and fixed by sliding the slope structure into the annular groove. The split is divided into two parts which can play a role in buffering, and the split and the first pole are clamped to avoid deformation of the upper insulating part caused by high temperature influence and external pressure, so that a stable insulating effect can be achieved.

Description

Power battery top cap and power battery

Technical Field

The utility model relates to an energy storage apparatus technical field especially relates to a power battery top cap and power battery.

Background

The power battery is a novel green and environment-friendly energy storage component, has the advantages of good high-current discharge performance, high energy density, green and environment-friendliness, high energy density, long service life and the like, and is widely applied to the fields of energy storage technology, hybrid electric vehicles, communication, household appliances, war industry, aerospace and the like. However, with the increasingly improved technology of electric vehicles, electric vehicles and hybrid vehicles are closer to the daily lives of people, and there is a great business opportunity, and meanwhile, electric vehicles put higher demands on the capacity and safety performance of lithium ion batteries for supplying energy to the electric vehicles. Promote effective space as far as inside the electric core, need effectively guarantee the insulating function between positive and negative pole again simultaneously, prevent the risk of short circuit.

The insulating part is gone out to the integrated into one piece of moulding plastics at the periphery wall of utmost point post usually to keep apart with utmost point post periphery wall and external world in order to prevent the short circuit. The injection molding material is usually PPS, the injection molded upper insulating part is difficult to bear the influence of high temperature and external force, and the upper insulating part is easy to deform and difficult to maintain the insulating effect when being influenced by the high temperature inside the battery and external pressure. And the injection molding process usually requires high temperature operation, and the production process has high temperature danger and is difficult to disassemble and reuse.

SUMMERY OF THE UTILITY MODEL

Based on the problem, the utility model aims at providing a power battery top cap and power battery, this power battery top cap go up the insulating part and need not to mould plastics, can avoid the potential safety hazard that injection moulding brought, and it has the insulating nature of preferred, and reuse once more.

In order to achieve the above object, the utility model provides a power battery top cap, include the top cap piece, locate first utmost point post unit on the top cap piece, first utmost point post unit includes first utmost point post, sealing member and goes up the insulating part, the top cap piece is equipped with first mounting hole, first utmost point post is worn to establish first mounting hole and borrow in sealing member fixed mounting in first mounting hole, the periphery wall of first utmost point post is equipped with the ring channel, it includes split type first insulation portion and second insulating part to go up the insulating part, first insulation portion with the second insulating part all is equipped with the slope structure in relative one end, first insulation portion with the second insulating part borrow by the slope structure in sliding action in the ring channel and joint in the periphery wall of first utmost point post.

As an embodiment, the first insulating portion and the second insulating portion are symmetrical to each other, the first insulating portion includes a body and two extending portions formed by two opposite ends of the body extending in a direction of the second insulating portion, and upper surfaces of the extending portions are inclined downward in the direction of the second insulating portion to form the slope structure at ends thereof.

As an embodiment, the extending portion is provided with an engaging portion at one end of the slope structure close to the body, and a part of the circumferential wall of the annular groove is recessed upwards to form a clamping groove engaged with the engaging portion.

As an embodiment, a gap is provided between the first insulating portion and the second insulating portion.

As an embodiment, the first insulating portion and the second insulating portion are fixed to each other in a clamping manner.

As an embodiment, the first insulating portion includes a first body and two first extending portions formed by extending opposite ends of the first body in a direction of the second insulating portion, an upper surface of the first extending portion is inclined downward in the direction of the second insulating portion to form a first slope structure at an end thereof, the first extending portion is provided with a first recess portion at one end of the first slope structure close to the first body, the second insulating portion includes a second body and two second extending portions formed by extending opposite ends of the second body in the direction of the first insulating portion, a lower surface of the second extending portion is inclined upward in the direction of the first insulating portion to form a second slope structure at an end thereof, the second extending portion is provided with a second recess portion at one end of the second slope structure close to the second body, the first slope structure is fastened to the second recess portion, and the second slope structure is fastened to the first recess portion.

As an embodiment, the first pole comprises a column body part penetrating through the first mounting hole and a connecting part located below the top cover plate, the sealing element is sleeved on the column body part and abutted against the connecting part and the top cover plate, and the peripheral wall of the column body part is provided with the annular groove.

As an embodiment, a lower insulating piece is arranged between the connecting part and the top cover plate.

As an embodiment, the top profile of the column portion is square or circular.

The utility model discloses the second aspect provides including electric core, holding the casing and the sealing of electric core the aforementioned power battery top cap of casing.

The technical effects of the utility model are that: the utility model discloses last insulating part split in the power battery top cap becomes first insulation portion and second insulation portion, and the ring channel on the periphery wall is slided into through the slope structure in first insulation portion and the second insulation portion, can make first insulation portion and second insulation portion also imbed the ring channel, and it is fixed to have realized the joint between last insulating part and the first utmost point post promptly. This approach eliminates the need for injection molding because the high temperature safety risks associated with injection molding can be avoided. The split is divided into two parts which can play a role in buffering, and the split and the first pole are clamped to avoid deformation of the upper insulating part caused by high temperature influence and external pressure, so that a stable insulating effect can be achieved. The first insulating part and the second insulating part are embedded into the annular groove through a slope structure, and can be pulled out of the annular groove again through reverse external acting force, so that the annular groove can be used repeatedly.

Drawings

Fig. 1 is a plan view of a first embodiment of the top cover of the power battery of the present invention.

Fig. 2 is a perspective view of the first embodiment of the top cover of the power battery of the present invention in a first direction.

Fig. 3 is a perspective view of the first embodiment of the top cover of the power battery of the present invention in a second direction.

Fig. 4 is an exploded view of the first embodiment of the top cap of the power battery of the present invention in a first direction.

Fig. 5 is an exploded view of the first embodiment of the top cap of the power battery according to the present invention in a second direction.

FIG. 6 isbase:Sub>A cross-sectional view of the power cell top cover of FIG. 1 taken in the direction A-A.

FIG. 7 is a cross-sectional view of the power cell top cover of FIG. 1 in the direction B-B.

Fig. 8 is an enlarged view of the circled portion in fig. 6.

Fig. 9 is an enlarged view of the circled portion in fig. 7.

Fig. 10 is an enlarged view of the circled portion in fig. 2.

Fig. 11 is a top view of a second embodiment of the top cover of the power battery of the present invention.

Fig. 12 is a perspective view of a second embodiment of the top cover of the power battery of the present invention.

Fig. 13 is an exploded view of a second embodiment of a top cap of a power battery according to the present invention in a first direction.

Fig. 14 is an exploded view of a second embodiment of the top cover of the power battery according to the present invention in a second direction.

FIG. 15 isbase:Sub>A cross-sectional view of the power cell top cover of FIG. 11 in the A-A direction.

FIG. 16 is a cross-sectional view of the power cell top cover of FIG. 11 in the direction B-B.

Fig. 17 is an enlarged view of the circled portion in fig. 15.

Fig. 18 is an enlarged view of the circled portion in fig. 16.

Fig. 19 is an enlarged view of the circled portion in fig. 12.

Fig. 20 is a top view of a third embodiment of the top cover of the power battery of the present invention.

Fig. 21 is a perspective view of a third embodiment of the top cover of the power battery of the present invention.

Fig. 22 is an exploded view of a third embodiment of the top cover of the power battery of the present invention in a first direction.

Fig. 23 is an exploded view of a third embodiment of a top cover of a power battery according to the present invention in a second direction.

FIG. 24 isbase:Sub>A cross-sectional view of the power cell top cover of FIG. 20 in the A-A direction.

FIG. 25 is a cross-sectional view of the power cell top cover of FIG. 20 in the direction B-B.

Fig. 26 is an enlarged view of the circled portion in fig. 24.

Fig. 27 is an enlarged view of the circled portion in fig. 25.

Fig. 28 is an enlarged view of the circled portion in fig. 21.

DESCRIPTION OF SYMBOLS IN THE DRAWINGS

100-power battery top cover; 10-a top cover sheet; 11-a first mounting hole; 13-a second mounting hole; 15-liquid injection hole; 17-explosion-proof valve hole; 30-a first pole unit; 31-a first pole; 311-a column portion; 3111-ring channel; 3113-card slot; 313-a connecting portion; 33-an upper insulator; 33 a-first insulating portion; 331-a body; 331 a-a first body; 331 b-a second body; 333-an extension; 333 a-a first extension; 333 b-a second extension; 3331-ramp structure; 3331 a-first ramp structure; 3331 b-a second ramp structure; 3333-a chimeric moiety; 3335 a-first recess; 3335 b-second recess; 33 b-a second insulating portion; 35-a seal; 50-a second pole cell; 51-a second pole; 511-a second pole body portion; 5111-second polar annular groove; 5113-second pole card slot; 513 — a second pole connection portion; 53-second pole upper insulator; 53 a-third insulation; 531-second pole body; 531 a-third ontology; 531 b-fourth ontology; 533-a second pole extension; 533 a-third extension; 533 b-a fourth extension; 5331-a second pole ramp structure; 5331 a-a third ramp structure; 5331 b-a fourth ramp structure; 5333 a second pole fitting part; 5335 a-a third recess; 5335 b-a fourth recess; 53 b-fourth insulation; 55-second pole seal; 70-lower insulation; s-gap

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are illustrated in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be noted that, in general, the secondary battery is placed vertically, one side of the secondary battery top cover, which extends out and is connected with the outside, is an upper side, i.e., a top direction, and the other side is a lower side, i.e., a bottom direction.

The secondary battery top cap and the secondary battery thereof according to the present invention will be described with reference to the accompanying drawings.

A power battery generally includes a battery cell, a housing for accommodating the battery cell, and a power battery top cover for sealing the housing. The top cover of the power battery can be welded with the shell for sealing, and secondary battery electrolyte for infiltrating the battery core is injected into the shell. As shown in fig. 1 to 7, 11 to 16, and 20 to 25, the secondary battery top cap 100 includes a top cap sheet 10, and a first pole unit 30, a second pole unit 50, and an explosion-proof valve assembly (not shown) disposed on the top cap sheet 10. The top cover plate 10 is provided with a first mounting hole 11, a second mounting hole 13, a liquid injection hole 15 and an explosion-proof valve mounting hole 17, the first pole column unit 30 is fixedly mounted in the first mounting hole 11, the second pole column unit 50 is fixedly mounted in the second mounting hole 13, and an explosion-proof valve assembly is fixedly mounted in the explosion-proof valve mounting hole 17. The explosion-proof valve assembly may be of conventional construction, such as consisting of an explosion-proof valve and a protective sheet, and will not be described further since it is not the focus of the present invention.

First, the first pole unit 30 of the secondary battery top cap 100 of the present invention will be described in detail. As shown in fig. 1 to 28, the first pole unit 30 includes a first pole 31, a sealing member 35, and an upper insulating member 33. The top cover plate 10 is provided with a first mounting hole 11, and the first pole column 31 penetrates through the first mounting hole 11 and is fixedly mounted in the first mounting hole 11 through a sealing element 35. The first pole 31 comprises a column 311 penetrating the first mounting hole 11 and a connecting part 313 located below the top cover plate 10, and a lower insulating member 70 is arranged between the connecting part 313 and the top cover plate 10. The sealing member 35 is fitted to the column portion 311 and abuts against the connection portion 313 and the top cover sheet 10, and an annular groove 3111 is formed in the outer peripheral wall of the column portion 311. The upper insulator 33 includes a first insulating portion 33a and a second insulating portion 33b which are separated. The first insulating portion 33a and the second insulating portion 33b are respectively provided with a slope structure 3331 at opposite ends, and the first insulating portion 33a and the second insulating portion 33b are clamped to the outer peripheral wall of the first pole post 31 by the sliding action of the slope structure 3331 in the annular groove 3111. The slope structures 3331 of the first insulating part 33a and the second insulating part 33b are embedded into the annular groove 3111 of the outer peripheral wall of the first pole post 31, so that the upper insulating part 33 and the first pole post 31 can be clamped and fixed. The split becomes two parts and can play the cushioning effect, can avoid high temperature influence and external pressure to lead to going up insulating part 33 to take place deformation with first utmost point post 31 joint again, so can play stable insulating effect. The first and second insulating portions 33a and 33b are inserted into the annular groove 3111 through the slope structure 3331, and are again withdrawn from the annular groove 3111 by a reverse external force so as to be used repeatedly.

As shown in fig. 1 to 10, the first insulating portion 33a and the second insulating portion 33b are symmetrical to each other. The first insulating portion 33a includes a body 331 and two extending portions 333 formed by opposite ends of the body 331 to extend in a direction of the second insulating portion 33b, and an upper surface of the extending portion 333 is inclined downward in the direction of the second insulating portion 33b to form a slope structure 3331 at an end thereof. The extending portion 333 is provided with an engaging portion 3333 at an end of the slope structure 3331 close to the body 331, and the engaging portion 3333 may be formed by stacking a plurality of steps higher than the slope structure 3331. A part of the circumferential wall of the annular groove 3111 is recessed upward to form a notch 3113 to be engaged with the fitting portion 3333. The upper insulator 33 can be clamped with the first pole 31 via the slope 3331, and the connection reliability can be further enhanced via the clamping between the engaging portion 3333 and the clamping groove 3113. A gap S is provided between the first insulating portion 33a and the second insulating portion 33b, and the gap S is configured to provide a buffer function when the power battery top cover 100 is subjected to an external pressure.

Alternatively, as shown in fig. 11 to 28, the first insulating portion 33a and the second insulating portion 33b may be fixed to each other in a snap-fit manner. The first insulating portion 33a includes a first body 331a and two first extending portions 333a formed by extending opposite ends of the first body 331a in the direction of the second insulating portion 33b. The upper surface of the first extension part 333a is inclined downward in the direction of the second insulating part 33b to form a first slope structure 3331a at an end thereof. The first extending portion 333a has a first recessed portion 3335a at an end of the first slope structure 3331a close to the first body 331a. The second insulating portion 33b includes a second body 331b and two second extending portions 333b formed by extending opposite ends of the second body 331b in the direction of the first insulating portion 33a. The lower surface of the second extension part 333b is inclined upward in the direction of the first insulation part 33a to form a second slope structure 3331b at an end thereof. The second extending portion 333b has a second recessed portion 3335b at an end of the second slope structure 3331b close to the second body 331b. The first slope structure 3331a is engaged with the second recess 3335b, and the second slope structure 3331b is engaged with the first recess 3335a. The first insulating portion 33a and the second insulating portion 33b are also inserted into the annular groove 3111 by sliding the slope structure 3331 (e.g., the first slope structure 3331a and the second slope structure 3331 b) into the annular groove 3111, i.e., the upper insulating member 33 is clamped with the first terminal post 31, and the connection reliability is further enhanced by the clamping between the recess portions (e.g., the first recess portion 3335a and the second recess portion 3335 b) and the slope structure 3331 (e.g., the first slope structure 3331a and the second slope structure 3331 b).

Further, the top profile of the column portion 311 of the first pole 31 may be square as shown in fig. 1 to 10 and 20 to 28, or may be circular as shown in fig. 11 to 19.

The second pole cell 50 and the first pole cell 30 are substantially similar in structure. The second pole unit 50 can be either a positive pole unit or a negative pole unit, and the corresponding first pole unit is either a negative pole unit or a positive pole unit.

As shown in fig. 1 to 28, the second pole unit 50 includes a second pole 51, a second pole seal 55, and a second pole upper insulator 53. The top cover plate 10 is provided with a second mounting hole 13, and the second pole post 51 penetrates through the second mounting hole 13 and is fixedly mounted in the second mounting hole 13 by a second pole sealing element 55. The second pole post 51 includes a second pole post body portion 511 inserted into the second mounting hole 13 and a second pole connecting portion 513 positioned below the top cover plate 10, and a lower insulator 70 is provided between the second pole connecting portion 513 and the top cover plate 10. The second pole sealing member 55 is sleeved on the second pole column portion 511 and abuts against the second pole connecting portion 513 and the top cover plate 10, and a second pole annular groove 5111 is formed in an outer peripheral wall of the second pole column portion 511. The second pole upper insulator 53 includes split-type third and fourth insulating portions 53a and 53b. The third insulating portion 53a and the fourth insulating portion 53b are both provided with a second pole slope structure 5331 at opposite ends, and the third insulating portion 53a and the fourth insulating portion 53b are clamped to the outer peripheral wall of the second pole 51 by the sliding action of the second pole slope structure 5331 in the second pole annular groove 5111. The second pole annular groove 5111 on the outer circumferential wall of the second pole post 51 is inserted by the second pole slope structure 5331 on the third insulating portion 53a and the fourth insulating portion 53b, so that the snap-fit fixation between the second pole upper insulator 53 and the second pole post 51 is achieved. The split part can play a role in buffering, and then the split part is clamped with the second pole 51 to avoid the deformation of the second pole upper insulating piece 53 caused by high temperature influence and external pressure, so that a stable insulating effect can be achieved. The third and fourth insulating portions 53a and 53b are inserted into the second pole annular groove 5111 by the second pole slope structure 5331, and can be pulled out of the second pole annular groove 5111 again by a reverse external force so as to be reusable.

As shown in fig. 1 to 10, the third insulating portion 53a and the fourth insulating portion 53b are symmetrical to each other. The third insulating part 53a includes a second pole body 531 and two second pole extension parts 533 formed by opposite ends of the second pole body 531 extending in the direction of the fourth insulating part 53b, and an upper surface of the second pole extension part 533 is inclined downward in the direction of the fourth insulating part 53b to form a second pole slope structure 5331 at its end. The second pole extension portion 533 has a second pole engaging portion 5333 at an end of the second pole slope structure 5331 close to the second pole body 531, and the second pole engaging portion 5333 can be formed by stacking a plurality of steps higher than the second pole slope structure 5331. A part of the peripheral wall of the second pole annular groove 5111 is recessed upward to form a second pole engaging groove 5113 engaged with the second pole engaging portion 5333. The second pole upper insulator 53 can be engaged with the second pole 51 not only by the second pole slope 5331, but also by engagement between the second pole engaging portion 5333 and the second pole engaging groove 5113.

Alternatively, as shown in fig. 11 to 28, the third insulating portion 53a and the fourth insulating portion 53b may be fixed to each other in a snap-fit manner. The third insulating part 53a includes a third body 531a and two third extending parts 533a formed by opposite ends of the third body 531a extending in the direction of the fourth insulating part 53b. The upper surface of the third extension portion 533a is inclined downward in the direction of the fourth insulating portion 53b to form a third slope structure 5331a at an end thereof. The third extending portion 533a has a third concave portion 5335a at an end of the third inclined structure 5331a close to the third body 531 a. The fourth insulating part 53b includes a fourth body 531b and two fourth extending parts 533b formed by opposite ends of the fourth body 531b extending in the direction of the third insulating part 53 a. The lower surface of the fourth extension portion 533b is inclined upward in the direction of the third insulating portion 53a to form a fourth slope structure 5331b at an end thereof. The fourth extending portion 533b has a fourth concave portion 5335b at an end of the fourth slope structure 5331b close to the fourth body 531 b. The third ramp structure 5331a is engaged with the fourth recess 5335b, and the fourth ramp structure 5331b is engaged with the third recess 5335a. By sliding the slope structures 5331 (e.g., the third slope structure 5331a and the fourth slope structure 5331 b) into the second pole annular groove 5111, the third insulating portion 53a and the fourth insulating portion 53b can also be embedded into the second pole annular groove 5111, i.e., the second pole upper insulator 53 and the second pole 51 can be clamped, and the connection firmness can be further enhanced by the clamping between the recesses (e.g., the third recess 5335a and the fourth recess 5335 b) and the second pole slope structure 5331 (e.g., the third slope structure 5331a and the fourth slope structure 5331 b).

The utility model discloses a go up the material of insulating part 33 not only is limited to PPS, and it also can be for other materials as long as satisfy the electrical insulation and have certain intensity can.

The above embodiments are only used to illustrate the technical solutions of the present invention, not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, the present invention is not limited to the embodiments, and it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. The utility model provides a power battery top cap (100), its characterized in that, include top cap piece (10), locate first utmost point post unit (30) on top cap piece (10), first utmost point post unit (30) include first utmost point post (31), sealing member (35) and go up insulating part (33), top cap piece (10) are equipped with first mounting hole (11), first utmost point post (31) wear to establish first mounting hole (11) and borrow sealing member (35) fixed mounting in first mounting hole (11), the periphery wall of first utmost point post (31) is equipped with ring channel (3111), it includes split type first insulating part (33 a) and second insulating part (33 b) to go up insulating part (33), first insulating part (33 a) with second insulating part (33 b) all are equipped with ramp structure (3331) in relative one end, first insulating part (33 a) with second insulating part (33 b) borrow by ramp structure (3331) are in slip effect in ring channel (3111) and first utmost point post (31) the joint in the periphery wall (31).

2. The top cover (100) for power battery according to claim 1, wherein the first insulating portion (33 a) and the second insulating portion (33 b) are symmetrical to each other, the first insulating portion (33 a) comprises a body (331) and two extending portions (333) formed by extending two opposite ends of the body (331) in the direction of the second insulating portion (33 b), the upper surfaces of the extending portions (333) are inclined downwards in the direction of the second insulating portion (33 b) and form the slope structure (3331) at the ends thereof.

3. The top cover (100) for power battery according to claim 2, wherein the extending portion (333) is provided with an engaging portion (3333) at an end of the slope structure (3331) close to the body (331), and a part of a peripheral wall of the annular groove (3111) is recessed upwards to form a slot (3113) engaged with the engaging portion (3333).

4. The power cell top cover (100) according to claim 2, wherein a gap (S) is provided between the first insulating portion (33 a) and the second insulating portion (33 b).

5. The power battery top cover (100) according to claim 1, wherein the first insulating portion (33 a) and the second insulating portion (33 b) are clamped and fixed to each other.

6. The power cell top cover (100) according to claim 5, the first insulating portion (33 a) includes a first body (331 a) and two first extending portions (333 a) formed by extending opposite ends of the first body (331 a) in a direction of the second insulating portion (33 b), the upper surface of the first extension part (333 a) is inclined downward in the direction of the second insulating part (33 b) to form a first slope structure (3331 a) at the end thereof, the first extending part (333 a) is provided with a first concave part (3335 a) at one end of the first slope structure (3331 a) close to the first body (331 a), the second insulating portion (33 b) includes a second body (331 b) and two second extending portions (333 b) formed by opposite ends of the second body (331 b) extending in a direction of the first insulating portion (33 a), the lower surface of the second extension part (333 b) is inclined upward in the direction of the first insulation part (33 a) to form a second slope structure (3331 b) at the end thereof, the second extending part (333 b) is provided with a second concave part (3335 b) at one end of the second slope structure (3331 b) close to the second body (331 b), the first slope structure (3331 a) is clamped in the second concave part (3335 b), the second slope structure (3331 b) is clamped in the first concave part (3335 a).

7. The power battery top cover (100) according to claim 1, wherein the first pole (31) comprises a column part (311) penetrating through the first mounting hole (11) and a connecting part (313) located below the top cover plate (10), the sealing member (35) is sleeved on the column part (311) and abuts against the connecting part (313) and the top cover plate (10), and the annular groove (3111) is formed in the peripheral wall of the column part (311).

8. The top cover (100) of the power battery according to claim 7, wherein a lower insulator (70) is arranged between the connecting part (313) and the top cover sheet (10).

9. The power cell top cover (100) according to claim 7, wherein the column portion (311) is square or circular in top profile.

10. A power battery, characterized by comprising a battery cell, a casing for accommodating the battery cell, and a power battery top cover (100) according to any one of claims 1 to 9 for sealing the casing.

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