CN220731647U

CN220731647U - Soft package battery

Info

Publication number: CN220731647U
Application number: CN202322270551.7U
Authority: CN
Inventors: 刘能; 王浩; 孙宝林; 郭彬林
Original assignee: Chuneng New Energy Co Ltd
Current assignee: Chuneng New Energy Co Ltd
Priority date: 2023-08-23
Filing date: 2023-08-23
Publication date: 2024-04-05
Anticipated expiration: 2033-08-23

Abstract

The utility model discloses a soft package battery, and relates to the technical field of batteries. Including electric core, utmost point ear, plastic-aluminum membrane, the plastic-aluminum membrane parcel electric core and edge seal, but the utmost point ear stretch out in outside the plastic-aluminum membrane, the bonding cover is equipped with annular rubber ring on the utmost point ear, the plastic-aluminum membrane with annular rubber ring heat-seal connection, still be equipped with the cooperation utmost point ear on the utmost point ear in order to further press from both sides the tight subassembly of clamp of annular rubber ring and plastic-aluminum membrane that is located utmost point ear department. According to the soft-package battery, on the premise of not compressing the size of the battery core, the electrolyte of the soft-package battery is prevented from leaking at the electrode lug through the top sealing structure, the leakage-proof effect is stable, and the battery performance is not damaged.

Description

Soft package battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a soft package battery.

Background

The top sealing process of the soft package battery is to put the welded battery core into the aluminum plastic film punched with the pit, then fold the packaged aluminum plastic film in half, finely adjust the top position, align the tab glue on the tab welded by the battery core with the aluminum plastic film, and then heat seal the battery core, so as to ensure that the non-sealed tab glue is exposed outside and inside the top sealing area after top sealing.

The Chinese patent with publication number of CN212342769U discloses a top sealing structure of a soft package battery, which comprises a battery core, a tab arranged on the battery core and an aluminum plastic film wrapping the battery core, wherein two tab adhesives are arranged on the tab to form two top sealing structures at the tab of the soft package battery, and a liquid absorption strip is further arranged between the two top sealing structures to further absorb electrolyte leaking from the first top sealing structure so as to effectively prevent battery leakage. However, in order to simultaneously set two top sealing structures on the tab, the size of the tab is increased correspondingly, the size of the battery core is reduced correspondingly on the premise that the overall size of the soft-packaged battery is unchanged, and the size of the battery core is reduced relatively, so that the battery performance is reduced.

Disclosure of Invention

The utility model discloses a soft-package battery, which is used for solving the technical problems by preventing electrolyte of the soft-package battery from leaking at a lug through a top sealing structure on the premise of not compressing the size of a battery core and having stable leakage-proof effect.

The technical scheme for solving the problems is as follows: the utility model provides a soft package battery, including electric core, utmost point ear, plastic-aluminum membrane, the plastic-aluminum membrane parcel the electric core and edge seal, but the utmost point ear stretch out in outside the plastic-aluminum membrane, the bonding cover is equipped with annular rubber ring on the utmost point ear, the plastic-aluminum membrane with annular rubber ring heat-seal connection, still be equipped with the cooperation utmost point ear on the utmost point ear in order to further press from both sides the tight subassembly of clamp of annular rubber ring and plastic-aluminum membrane that is located utmost point ear department.

Further, the clamping assembly comprises clamping plates which are oppositely arranged at two sides of the pole lugs, the clamping plates are connected to the pole lugs, and the clamping plates are formed by bending to be matched with the pole lugs or directly form a clamping structure for clamping the annular rubber ring and the aluminum plastic film.

Further, the clamping plate is arranged with the tab lamination, the clamping plate is fixedly connected with the tab at the edge of the end, which is closer to the battery cell, of the clamping plate, and the clamping structure is formed by bending the plate end, which is farther from the battery cell, of the clamping plate towards the battery cell direction to form the clamping plate directly or form the clamping plate in a manner of being matched with the tab.

Further, along the direction of keeping away from the electric core, a plurality of crease marks are equidistantly arranged on the clamping plate.

Further, the end edge of the clamping plate, which is closer to the battery cell, is integrally connected with the tab.

Further, along the width direction of the tab, the two sides of the clamping plate are provided with auxiliary clamping pieces in an extending mode, and when the clamping plate is used for clamping the annular rubber ring and the aluminum plastic film at the tab, the two groups of auxiliary clamping pieces located at the same side of the two opposite clamping plates are matched with each other to further clamp the aluminum plastic film located at the two sides of the tab.

Further, when the auxiliary clamping pieces positioned on the same side of the two opposite clamping plates are mutually matched to clamp the aluminum plastic film positioned on the outer side of the edge of the tab, the two mutually matched auxiliary clamping pieces are also limited and tightly attached by the U-shaped clamp.

Further, when the clamping plate corresponds to the annular rubber ring and the aluminum plastic film which are clamped at the lug, an insulating rubber strip used for isolating the clamping plate is further arranged on the outer side of the clamping plate.

The utility model has the beneficial effects that:

1. when plastic-aluminum membrane and annular rubber ring heat-seal connection in utmost point ear department, press from both sides tight subassembly can further press from both sides tight plastic-aluminum membrane and the annular rubber ring of heat-seal connection each other, makes the plastic-aluminum membrane paste tightly in annular rubber ring, and annular rubber ring pastes tightly in utmost point ear surface to prevent to lead to annular rubber ring to come unstuck because of the erosion of chemical substances such as electrolyte or too long time, and then lead to appearing the gap between annular rubber ring and the utmost point ear, lead to the problem that electrolyte revealed to appear.

2. The clamping assembly is integrally connected with the lug, and when the clamping assembly is correspondingly matched with the annular rubber ring and the aluminum plastic film at the lug, the clamping assembly also forms a covering and blocking structure at the edge of the aluminum plastic film so as to prevent glue solution on the annular rubber ring from overflowing or prevent impurities outside the soft-package battery from eroding the annular rubber ring because the edge of the aluminum plastic film does not exceed the annular rubber ring. Moreover, when the aluminum-plastic film wraps the battery core, if the edges of the aluminum-plastic film are not aligned at the lug, the clamping assembly can cover the edges of the aluminum-plastic film which are not flush at the lug so as to improve the aesthetic property of the battery.

3. For convenient operation, the clamping component conventionally adopts the sheetmetal, and corresponding, the clamping component is in the annular rubber ring and the plastic-aluminum membrane of clamping tab department, in order to avoid clamping component conduction electric energy, still is equipped with insulating adhesive tape in order to keep apart clamping component in the clamping component outside to prevent battery leakage, promote battery security.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description, serve to explain the principles of the utility model. In the drawings, like reference numerals are used to identify like elements. The drawings, which are included in the description, illustrate some, but not all embodiments of the utility model. Other figures can be derived from these figures by one of ordinary skill in the art without undue effort.

Fig. 1 is a front view schematically showing the overall structure of a soft pack battery of the present embodiment;

fig. 2 is a side view schematically showing the overall structure of the pouch electric cell of the present embodiment;

fig. 3 is a schematic top view showing the overall structure of the soft pack battery of the present embodiment;

FIG. 4 is a schematic view A-A in section of FIG. 1;

1-battery cell, 2-tab, 3-plastic-aluminum membrane, 4-annular rubber ring, 5-clamping plate, 6-bending crease, 7-auxiliary clamping piece, 8-U-shaped clamping and 9-insulating adhesive tape.

Detailed Description

The terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible in this specification are defined with respect to the configurations shown in the drawings, and the terms "inner" and "outer" refer to the relative concepts of the terms toward or away from the geometric center of a particular component, respectively, and thus may be changed accordingly depending on the location and use state of the component. These and other directional terms should not be construed as limiting terms.

Firstly, it should be noted that, the improvement of the present utility model is mainly embodied at the heat-sealing joint position of the aluminum plastic film 3 and the tab 2, so that the technical scheme of the specific embodiment of the present utility model can be understood through the relatively clear drawings, the drawings to which the specific embodiment of the present utility model is correspondingly referred mainly show the structure of the tab 2 of the soft package battery, and other parts not shown in the drawings can be understood as the prior art.

Next, referring to fig. 1 to 3, a soft package battery according to an embodiment of the present utility model includes a battery core 1, a tab 2, and an aluminum-plastic film 3, wherein the aluminum-plastic film 3 is folded upwards from the middle to wrap the battery core 1, and the folded edge of the folded aluminum-plastic film 3 is directly sealed, but the tab 2 extends upwards beyond the folded aluminum-plastic film 3. When the electrode lug 2 can extend out of the aluminum plastic film 3, the electrode lug 2 and the aluminum plastic films 3 on the two sides of the electrode lug 2 need to be further sealed, so that an annular rubber ring 4 is sleeved at the corresponding position on the electrode lug 2, the inner side and the outer side of the annular rubber ring 4 are provided with adhesive layers, the inner side of the annular rubber ring 4 is in adhesive sealing connection with the electrode lug 2, and the aluminum plastic films 3 on the outer side corresponding to the two sides of the electrode lug are in sealing bonding through a heat sealing process; moreover, after the aluminum plastic film 3 and the annular rubber ring 4 are connected in a heat sealing manner, a clamping assembly is arranged on the pole lug 2, the aluminum plastic films 3 on the front side and the rear side of the pole lug 2 are further pressed on the annular rubber ring 4 through the clamping assembly, the annular rubber ring 4 is pressed on the surface of the pole lug 2, and meanwhile, the aluminum plastic films 3 and the annular rubber ring 4 are clamped, so that the problem of liquid leakage of the soft package battery caused by degumming of the annular rubber ring 4 and separation of the annular rubber ring 4 and the pole lug 2 is prevented.

In this embodiment, the annular rubber ring 4 may be formed by winding an adhesive tape around the tab 2 and connecting the tabs end to end, or may be an integral elastic rubber ring. When the annular rubber ring 4 is an integral elastic rubber ring, an adhesive layer is arranged on the inner side of the annular rubber ring 4, a diaphragm is stuck on the outer surface of the adhesive layer, the annular rubber ring 4 is sleeved on the corresponding position of the pole lug 2, and then the diaphragm is torn off, so that the annular rubber ring 4 can be stably stuck and sleeved on the pole lug 2.

In this embodiment, the clamping assembly includes two clamping plates 5, the two clamping plates 5 are respectively disposed at front and rear sides of the tab 2, and lower ends of the two clamping plates 5 are fixedly connected to the tab 2.

Referring to fig. 2 and 4, taking one of the clamping plates 5 as an example, the clamping plate 5 is a metal plate made of the same material as the tab 2, initially, the lower end of the clamping plate 5 is fixedly connected with the lower end of the tab 2, the upper end of the clamping plate 5 extends upwards to pass through the inner side of the annular rubber ring 4, after the annular rubber ring 4 and the aluminum plastic film 3 are connected by heat sealing, the upper end of the clamping plate 5 can be bent downwards by bending the clamping plate 5, and then the whole clamping plate 5 forms a U-shaped clamping structure, so that the annular rubber ring 4 and the aluminum plastic film 3 which are connected by heat sealing are clamped, the annular rubber ring 4 and the side wall of the clamping plate 5 are not easy to separate, and electrolyte leakage from the tab 2 is prevented. Both clamping plates 5 clamp the annular rubber ring 4 and the aluminum plastic film 3 which are connected in a heat sealing manner in the same way.

Further, in order to facilitate bending of the clamping plate 5, and further enable the folds of the clamping plate 5 to be relatively flat and regular, a plurality of bending folds 6 are equidistantly arranged on the clamping plate 5 along the direction away from the battery cell 1.

In another embodiment, the lower end of the clamping plate 5 is further integrally and fixedly connected to the middle upper region of the tab 2, and the clamping plate 5 can be bent downwards from the position where the clamping plate is integrally and fixedly connected with the tab 2, so as to form a U-shaped clamping structure with the tab 2, and further clamp the annular rubber ring 4 and the aluminum plastic film 3.

In this embodiment, in order to prevent the electrolyte from leaking from the joint positions of the left and right ends of the annular rubber ring 4 and the aluminum plastic film 3, auxiliary clamping pieces 7 are provided at the left and right ends of the clamping plate 5 in an extending manner. Taking the left auxiliary clamping piece 7 as an example, when the clamping plates 5 on the front side and the rear side of the tab 2 are both used for clamping the aluminum plastic film 3 and the annular rubber ring 4, the left auxiliary clamping piece 7 of the front clamping plate 5 and the left auxiliary clamping piece 7 of the rear clamping plate 5 are correspondingly stuck tightly to each other, and the left end of the annular rubber ring 4 and the aluminum plastic film 3 are clamped, so that a gap at the joint position of the left end of the annular rubber ring 4 and the aluminum plastic film 3 is eliminated. In addition, when the two auxiliary clamping pieces 7 at the left end of the tab 2 are tightly attached to each other, the two auxiliary clamping pieces 7 are clamped by a U-shaped clamp 8 to keep the mutually attached state, so that the attaching and clamping states of the two auxiliary clamping pieces 7 are stable and not easy to change, and the stability of the two auxiliary clamping pieces is improved.

Similarly, the auxiliary clamping piece 7 at the right end of the clamping plate 5 is clamped at the position where the right end of the annular rubber ring 4 is combined with the aluminum plastic film 3 in the same manner, so that a gap at the position where the right end of the annular rubber ring 4 is combined with the aluminum plastic film 3 is eliminated.

In this embodiment, the U-shaped clip 8 is an elastic clip.

In this embodiment, the auxiliary clamping piece 7 is also a metal piece. Meanwhile, when the clamping plate 5 corresponds to the annular rubber ring 4 and the aluminum plastic film 3 at the clamping electrode lug 2, an insulating rubber strip 9 for isolating the clamping plate 5 is arranged on the outer side of the clamping plate 5 for preventing electric leakage; the two insulating adhesive tapes 9 are respectively positioned on the front side and the rear side of the tab 2 and are mutually attached to wrap the clamping piece and the auxiliary clamping piece 7 so as to prevent the electric energy of the battery from being released from the clamping plate 5 and improve the safety of the battery.

In a further embodiment, the auxiliary clamping piece 7 and the clamping plate 5 can also be fixedly connected to the battery cell 1. Furthermore, the clamping plate 5 and the auxiliary clamping piece 7 can be made of non-metallic materials on the premise that the clamping plate 5 can be bent and cannot be elastically restored.

The above is applicable to the prior art, where nothing is mentioned.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting. Although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. The utility model provides a soft packet of battery, includes electric core (1), utmost point ear (2), plastic-aluminum membrane (3) parcel electric core (1) and edge seal, but utmost point ear (2) stretch out in outside plastic-aluminum membrane (3), its characterized in that, bonding cover is equipped with annular rubber ring (4) on utmost point ear (2), plastic-aluminum membrane (3) with annular rubber ring (4) heat-seal connection, still be equipped with on utmost point ear (2) and be used for pressing from both sides tight annular rubber ring (4) and plastic-aluminum membrane (3) tight subassembly of clamp.

2. The soft package battery according to claim 1, wherein the clamping assembly comprises clamping plates (5) oppositely arranged at two sides of the tab (2), the clamping plates (5) are connected to the tab (2), and the clamping plates (5) are formed by bending to be matched with the tab (2) or directly form a clamping structure for clamping the annular rubber ring (4) and the aluminum plastic film (3).

3. A pouch cell as claimed in claim 2, wherein the clamping plate (5) is laminated with the tab (2), the clamping plate (5) being fixedly connected to the tab (2) at the edge of the clamping plate which is closer to the cell (1), the clamping structure being formed by bending the plate end of the clamping plate (5) which is farther from the cell (1) in the direction of the cell (1) so as to be straight or to be in engagement with the tab (2).

4. A pouch cell according to claim 2, wherein a plurality of bending creases (6) are equidistantly provided on the clamping plate (5) in a direction away from the cell (1).

5. A pouch cell according to claim 3, wherein the clamping plate (5) is integrally connected to the tab (2) at an end edge nearer to the cell (1).

6. A pouch cell as claimed in claim 2, wherein, along the width direction of the tab (2), both sides of the clamping plate (5) are provided with auxiliary clamping pieces (7) extending, and when the clamping plate (5) corresponds to the annular rubber ring (4) and the aluminum plastic film (3) at the position of clamping the tab (2), two sets of auxiliary clamping pieces (7) located at the same side of the two opposite clamping plates (5) are mutually matched to further clamp the aluminum plastic film (3) located at both sides of the tab (2).

7. A pouch cell according to claim 6, wherein when the auxiliary clamping pieces (7) on the same side of the opposite two clamping plates (5) are mutually matched to clamp the plastic-aluminum film (3) on the outer side of the edge of the tab (2), the two mutually matched auxiliary clamping pieces (7) are also limited and tightly attached by the U-shaped clamp (8).

8. The soft package battery according to claim 2, wherein when the clamping plate (5) corresponds to the annular rubber ring (4) and the aluminum plastic film (3) at the position of clamping the tab (2), an insulating rubber strip (9) for isolating the clamping plate (5) is further arranged on the outer side of the clamping plate (5).