CN211404619U

CN211404619U - A top head structure for soft packet of lithium cell encapsulation

Info

Publication number: CN211404619U
Application number: CN201921884477.5U
Authority: CN
Inventors: 许晓雄; 林晓; 周春龙; 张永龙
Original assignee: Zhejiang Funlithium New Energy Tech Co Ltd
Current assignee: Zhejiang Funlithium New Energy Tech Co Ltd
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-09-01
Anticipated expiration: 2029-11-04

Abstract

The utility model discloses a head structure for soft packet of lithium battery package relates to the encapsulation field of soft packet of lithium battery, including the upper die base that has the upper cover and the die holder that has the low head, upper cover and low head are corresponding, and all have utmost point ear encapsulation groove and the suppression face that is located utmost point ear encapsulation groove both sides, it glues the encapsulation groove to be provided with utmost point ear between suppression face and the utmost point ear encapsulation groove, utmost point ear glues and sets up the cambered surface between encapsulation groove and the utmost point ear encapsulation groove. By adopting the technical scheme, the end socket is provided with the grooves corresponding to the lug and lug glue packaging positions, when the packaging is carried out, the stress is uniform at each position, the problems of air leakage and bulging caused by poor sol effect due to uneven stress heating at the combined position of the lug and the non-lug are reduced, the joint of the lug and the lug glue groove is designed to be arc-shaped, the arc-shaped boundary is utilized to reduce the gap existing in the packaging of the two sides of the lug, and the poor packaging phenomenon caused by the deviation of the lug can be reduced.

Description

A top head structure for soft packet of lithium cell encapsulation

Technical Field

The utility model relates to a soft packet of lithium battery package field, in particular to a top head structure for soft packet of lithium battery package.

Background

With the rapid development of new energy automobile industry in recent years, the demand of power batteries is continuously increased. The power lithium battery is the key in the new energy automobile industry chain, and soft-package battery has advantages such as energy density height, good, the design is nimble, the security performance is good for square and cylindrical battery, and the demand increases gradually, and market share constantly increases. In the field of power batteries, the requirement on the power output capacity of the battery is higher and higher, so that the tab is required to have higher overcurrent capacity, and under the condition that the width of the tab is limited, the thickness of the tab needs to be increased to realize the purpose.

Therefore, soft package lithium battery is in the packaging process, the reliability of encapsulation is one of the important processes of producing soft package lithium battery, current top seal mainly adopts the hard seal technology, in order to avoid the encapsulation that the utmost point ear does not fall into the utmost point ear recess and arouse in the design badly, utmost point ear encapsulation groove is greater than about utmost point ear width 3mm, utmost point ear glue is greater than about utmost point ear width 10mm, when utmost point ear metallic conductor thickness exceeded 0.3mm, it is big at the combination position drop of utmost point ear and non-utmost point ear, banding intensity is not enough, lead to soft package lithium battery to appear leaking gas easily, bad phenomena such as bloated.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a top head structure for soft packet of lithium cell encapsulation.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme: the utility model provides a top head structure for soft packet of lithium cell encapsulation, is including the upper die base that has the upper cover and the die holder that has the low head, upper cover and low head are corresponding, and all have a plurality of utmost point ear encapsulation grooves and lie in the suppression face of utmost point ear encapsulation groove both sides, it glues the encapsulation groove to be provided with utmost point ear between suppression face and the utmost point ear encapsulation groove, it glues the encapsulation groove and sets up the cambered surface between the encapsulation groove to utmost point ear.

Through adopting above-mentioned technical scheme, fluting corresponds utmost point ear, utmost point ear and glues encapsulation position on the head, and when the encapsulation, the atress is even everywhere, has reduced the combination position of utmost point ear and non-utmost point ear because of the inhomogeneous gas leakage and the bloated problem that leads to well of sol effect that appears of atress heating, glues the recess junction at utmost point ear and establishes to the arc surface, and the boundary that utilizes the arc surface can reduce the space that utmost point ear both sides encapsulation exists, can reduce the bad phenomenon of encapsulation that arouses because of utmost point ear skew again.

Preferably, the arc of the arc surface is pi.

Through adopting above-mentioned technical scheme, make the bottom surface between utmost point ear encapsulation groove and the utmost point ear encapsulation groove like this, can be comparatively natural in the transition process to be favorable to further reducing the space that utmost point ear both sides encapsulation exists.

Preferably, a guide cylinder and a guide block matched with the guide cylinder are respectively arranged between the upper die base and the lower die base between the two adjacent pole lug packaging grooves (111).

By adopting the technical scheme, the upper sealing head and the lower sealing head can be butted together accurately in the process of mutually matching the guide block and the guide cylinder, so that the quality of pole lug encapsulation is ensured.

Preferably, the edge of the end part of the guide block is provided with a first guide surface, and the edge of the inner side of the opening of the guide cylinder is provided with a second guide surface.

Through adopting above-mentioned technical scheme, spigot surface one and spigot surface two help guide block and guide cylinder more smoothly in the cooperation process.

Preferably, the two ends of the opposite surfaces of the upper die holder and the lower die holder, which are close to the opposite surfaces, are respectively connected with the corresponding limiting blocks through screws.

Through adopting above-mentioned technical scheme, utilize the screw rod can adjust the height of stopper to can adjust the head encapsulation distance from top to bottom, at the head encapsulation in-process from top to bottom, the stopper both can protect the head, also can guarantee the uniformity of soft packet of lithium cell seal thickness.

Preferably, the upper die holder and the lower die holder are provided with the same vertical guide post at the position close to the limiting block at the same side.

Through adopting above-mentioned technical scheme, the guide post can further improve the alignment effect between the head from top to bottom to be favorable to further guaranteeing the quality of utmost point ear encapsulation.

Preferably, an oil storage groove is formed in the circumferential surface of the guide post in the axial direction.

Through adopting above-mentioned technical scheme, lubricating oil can be filled in the oil storage tank, is favorable to the upper die base like this pushing down the in-process that removes, reduces and the guide post between the friction to be favorable to improving lubricated effect.

Preferably, the upper die holder and the lower die holder are provided with projections matched with the oil storage grooves.

Through adopting above-mentioned technical scheme, be favorable to weakening like this upper and lower die holder around the trend that guide post takes place circumferential direction.

To sum up, the utility model discloses a beneficial technological effect does:

1. the tab glue packaging groove is arranged between the tab packaging groove and the pressing surface, so that stress at each position is uniform, and the problems of air leakage and bulging caused by poor sol effect due to uneven stress heating at the joint part of the tab and the non-tab are solved;

2. the lug glue packaging groove and the lug packaging groove are in transition through the cambered surface, so that gaps existing in the packaging of the two sides of the lug can be reduced;

3. the stopper passes through the screw rod to be fixed in the tip department that is close to of upper and lower die holder, utilizes the screw rod just so to adjust the height of stopper to can adjust upper and lower head encapsulation distance, at upper and lower head encapsulation in-process, the stopper both can protect the head, also can guarantee the uniformity of soft packet of lithium cell seal thickness.

Drawings

Fig. 1 is a schematic structural diagram of a top seal structure for a soft package lithium battery package according to a first embodiment;

FIG. 2 is an enlarged view of FIG. 1 at A;

fig. 3 is a packaging schematic diagram of a head cap structure for packaging a soft package lithium battery according to the first embodiment;

fig. 4 is a schematic structural diagram of a top seal structure for a soft package lithium battery package according to a second embodiment;

FIG. 5 is a schematic structural view of a guide block and a guide cylinder according to a second embodiment;

fig. 6 is a schematic structural diagram of a top seal structure for a soft package lithium battery package according to a third embodiment;

fig. 7 is an enlarged view of fig. 6 at B.

In the figure, 1, an upper die base; 11. an upper end enclosure; 111. a tab packaging groove; 112. pressing the noodles; 113. a tab glue packaging groove; 114. a cambered surface; 115. a guide cylinder; 1151. a second guide surface; 2. a lower die holder; 21. a lower end enclosure; 22. a limiting block; 23. a guide block; 231. a first guide surface; 24. perforating; 241. a bump; 3. a guide post; 31. an oil storage tank; 4. a tab; 5. gluing a tab; 6. and (3) an aluminum plastic film.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment,

The utility model provides a head structure for soft packet of lithium cell encapsulation, as shown in figure 1, includes rectangular upper die base 1 and die holder 2, wherein the up die base 1 and die holder 2 the face in opposite directions respectively integrative two sets of upper cover 11 and low head 21 have been set up, and upper cover 11 and low head 21 match. The number between the upper end enclosure 11 and the lower end enclosure 21 can be determined according to actual needs.

Meanwhile, as shown in the attached

drawings

2 and 3, the upper end enclosure 11 and the lower end enclosure 21 are respectively provided with a tab packaging groove 111 and pressing surfaces 112 positioned at two sides of the tab packaging groove 111, and a tab glue packaging groove 113 is arranged between the tab packaging groove 111 and the pressing surfaces 112, and the three are sequentially arranged in a stepped manner from the tab packaging groove 111 to the pressing surfaces 112, so that the stress at each position is uniform, and the problems of air leakage and bulging caused by poor sol effect of the tab glue 5 due to uneven stress heating at the combined position of the tab 4 and the aluminum plastic film 6 are solved. In addition, the tab glue packaging groove 113 and the tab packaging groove 111 are transited through the arc surface 114, and the radian of the arc surface 114 is pi, so that the transition between the tab glue packaging groove and the tab glue packaging groove is gentle, and therefore, gaps existing in the packaging of two sides of the tab can be reduced, and poor packaging caused by offset of the tab can be reduced.

Furthermore, as shown in fig. 1, the opposing surfaces of the upper die base 1 and the lower die base 2 are close to the respective two end portions, a limiting block 22 is fixed through a screw respectively, and the limiting blocks 22 on the upper die base 1 and the lower die base 2 correspond to each other two by two. Make things convenient for the staff like this to dismantle and change stopper 22 to adjust the height of stopper 22, thereby be convenient for adjust the encapsulation distance of upper cover 11 and low head 21, at the encapsulation in-process of upper cover 11 and low head 21, stopper 22 both can protect the head, also can guarantee the uniformity of soft packet of lithium cell seal thickness.

Example II,

Based on the first embodiment, with reference to fig. 4 and 5, the upper die base 1 is provided with the guide cylinder 115 between the two adjacent polar lug encapsulation grooves 111, the guide cylinder 115 is located on one outer side of the upper end enclosure 11, the lower die base 2 is provided with the guide block 23 between the two adjacent polar lug encapsulation grooves 111, and the guide block 23 is located on one outer side of the lower end enclosure 21. And the guide cylinder 115 and the guide block 23 correspond to each other. Furthermore, the edge of the guide block 23 facing one end of the guide cylinder 115 is provided with a first guide surface 231, and the edge of the inner side of the cylinder opening of the guide cylinder 115 is provided with a second guide surface 1151, so that the guide block 23 and the guide cylinder 115 can be more smoothly butted together. Therefore, the upper seal head 11 and the lower seal head 21 can be butted together accurately, and the packaging quality of the tab 4 is ensured.

Example III,

The utility model provides a top head structure for soft packet of lithium cell encapsulation, on the basis of embodiment one, combine that fig. 6 and fig. 7 are shown, upper die base 1 and die holder 2 are close to all wear to be provided with same vertical stopper 22 with the stopper 22's of one side position. An oil storage tank 31 is opened on the circumferential surface of the guide post 3, and lubricating oil can be added in the oil storage tank 31. Therefore, the upper die holder 1 can keep the lubricating effect with the guide columns 3 in the process of moving up and down. In addition, the upper die holder 1 is further provided with a projection 241 in the through hole 24 through which the guide post 3 passes, and the projection 241 is matched with the oil storage groove 31, so that the tendency of circumferential rotation of the upper die holder 1 around the guide post 3 in the moving process is further weakened. Thereby being beneficial to ensuring the packaging quality of the pole lugs.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. The utility model provides a top head structure for soft packet of lithium cell encapsulation, is including upper die base (1) that has upper cover (11) and lower bolster (2) that have low head (21), upper cover (11) and low head (21) are corresponding, and all have a plurality of utmost point ear encapsulation grooves (111) and be located suppression face (112) of utmost point ear encapsulation groove (111) both sides, its characterized in that, be provided with utmost point ear glue encapsulation groove (113) between suppression face (112) and utmost point ear encapsulation groove (111), it sets up cambered surface (114) between utmost point ear glue encapsulation groove (113) and utmost point ear encapsulation groove (111).

2. The top head structure for the soft package lithium battery package according to claim 1, wherein: the radian of the cambered surface (114) is pi.

3. The top head structure for the soft package lithium battery package according to claim 1, wherein: the guide cylinder (115) and the guide block (23) matched with the guide cylinder (115) are respectively arranged between the two adjacent polar lug packaging grooves (111) of the upper die holder (1) and the two adjacent polar lug packaging grooves (111) of the lower die holder (2).

4. The top head structure for the lithium battery pack soft package according to claim 3, wherein: the edge of the end part of the guide block (23) is provided with a first guide surface (231), and the edge of the inner side of the opening of the guide cylinder (115) is provided with a second guide surface (1151).

5. The top head structure for the soft package lithium battery package according to claim 1, wherein: two ends of the opposite surfaces of the upper die holder (1) and the lower die holder (2) close to the opposite surfaces are respectively connected with corresponding limiting blocks (22) through screws.

6. The top head structure for the lithium battery pack soft package according to claim 5, wherein: the upper die holder (1) and the lower die holder (2) are provided with the same vertical guide post (3) at the position close to the limiting block (22) at the same side.

7. The top head structure for the lithium battery pack soft package according to claim 6, wherein: an oil storage tank (31) is axially arranged on the circumferential surface of the guide column (3).

8. The top head structure for the lithium battery pack soft package according to claim 7, wherein: the upper die holder (1) and the lower die holder (2) are provided with convex blocks (241) matched with the oil storage groove (31).