CN210692700U

CN210692700U - Packaging structure of lithium ion battery

Info

Publication number: CN210692700U
Application number: CN201922307004.5U
Authority: CN
Inventors: 郭永民; 杨春海
Original assignee: Jiangsu Nuodi Amperex Technology Ltd
Current assignee: Jiangsu Nuodi Amperex Technology Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-06-05
Anticipated expiration: 2029-12-20

Abstract

The utility model discloses a lithium ion battery's packaging structure, including shell, naked electric core and top cap, still include expansion structure, expansion structure includes connecting plate, shrouding, recess, piston, first spring and second spring, naked electric core bottom outside is around being equipped with the connecting plate, naked electric core bottom has seted up flutedly, the inside shrouding that is equipped with of recess, shrouding top fixedly connected with piston. The utility model discloses a set up shrouding, recess, first spring and second spring, be favorable to not being when filling into the electrolyte in to naked electric core, extrude the shrouding under the effect of first spring is tensile and the second spring return force, when filling into unnecessary electrolyte, liquid extrusion shrouding for the second spring compression, first spring is tensile, and the corresponding position of shrouding downstream has avoided naked electric core to damage in the recess, has played the effect of fine inflation and buffering, has increased the space of inflation.

Description

Packaging structure of lithium ion battery

Technical Field

The utility model relates to a lithium ion battery field, in particular to lithium ion battery's packaging structure.

Background

As the demand for battery energy density by end customers increases, the development of high energy density platforms is more and more urgent. In order to improve the energy density of the battery, on one hand, the compaction density of the cathode and anode pole pieces is continuously improved, the high compaction density causes less and less electrolyte to be absorbed by cathode and anode active substances, and unabsorbed electrolyte is dissociated in the packaging aluminum foil, so that the appearance of the battery is expanded. On the other hand, the electrolyte plays an important role in the life cycle of the lithium ion battery, and in order to ensure the long cycle life of the battery core, enough electrolyte needs to be injected into the battery.

The present technology sets up the porous filling layer between naked electric core and packing aluminium foil for absorb free electrolyte, the inflation effect of this structure is less, when filling into electrolyte when more, still can cause naked electric core to damage.

Therefore, it is necessary to invent a package structure of a lithium ion battery to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a lithium ion battery's packaging structure to the long cycle life who proposes for guaranteeing electric core among the above-mentioned background of solution, when pouring into sufficient electrolyte into the battery inside, cause the problem that naked electric core damaged easily.

In order to achieve the above object, the utility model provides a following technical scheme: a packaging structure of a lithium ion battery comprises a shell, a naked battery cell, a top cover and an expansion structure, wherein the expansion structure comprises a connecting plate, a sealing plate, a groove, a piston, a first spring and a second spring, the connecting plate is arranged on the outer side of the bottom of the naked battery cell in a surrounding mode, the groove is formed in the bottom of the naked battery cell, the sealing plate is arranged inside the groove, the piston is fixedly connected to the top of the sealing plate, the first spring is fixedly connected to the top of the piston, the second spring is fixedly connected to the bottom of the sealing plate, the sealing plate is favorably extruded under the stretching action of the first spring and the returning force of the second spring when electrolyte is not filled into the naked battery cell by arranging the sealing plate, the groove, the first spring and the second spring, the sealing plate moves downwards in the groove to the corresponding position, the damage of naked electric core is avoided, the effect of fine inflation and buffering has been played, the expanded space has been increased.

Preferably, the closing plate is provided with a U-shaped section.

Preferably, the piston is fitted with the groove.

Preferably, one end of the first spring, which is far away from the piston, is fixedly connected with the top of the groove.

Preferably, the other end of the second spring is fixedly connected with the bottom of the shell.

The utility model has the advantages that:

(1) by arranging the sealing plate, the groove, the first spring and the second spring, when electrolyte is not filled into the bare cell, the sealing plate is extruded under the stretching action of the first spring and the returning action of the second spring, when the redundant electrolyte is filled, the liquid extrudes the sealing plate, so that the second spring is compressed, the first spring is stretched, the sealing plate moves downwards in the groove at a corresponding position, the damage of the bare cell is avoided, a good expansion and buffering effect is achieved, and the expansion space is increased;

(2) through setting up the piston, be favorable to sealing the recess, and then seal the shrouding, avoid electrolyte to flow out, simple structure facilitates the use.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an enlarged view of the portion A of FIG. 1;

in the figure: 1 shell, the naked electric core of 2, 3 top caps, 4 connecting plates, 5 shrouding, 6 recesses, 7 pistons, 8 first springs, 9 second springs.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model provides a lithium ion battery's packaging structure as shown in fig. 1-2, including shell 1, naked electric core 2 and top cap 3, still include expansion structure, expansion structure includes connecting plate 4, shrouding 5, recess 6, piston 7, first spring 8 and second spring 9, the 2 bottom outsides of naked electric core are encircleed and are equipped with connecting plate 4, recess 6 has been seted up to naked electric core 2 bottom, the inside shrouding 5 that is equipped with of

recess

6, 5 top fixedly connected with pistons 7 of shrouding, the first spring 8 of 7 top fixedly connected with of piston, 5 bottom fixedly connected with of shrouding a set of second spring 9.

Further, in the above technical solution, the section of the sealing plate 5 is provided with a U shape;

further, in the above technical solution, the piston 7 is fitted with the groove 6;

further, in the above technical solution, one end of the first spring 8, which is far away from the piston 7, is fixedly connected with the top of the groove 6;

further, in the above technical solution, the other end of the second spring 9 is fixedly connected to the bottom of the housing 1.

This practical theory of operation:

referring to specification attached drawing 1-2, when the using device, when not being filled with electrolyte in naked electric core 2, extrude shrouding 5 under the tensile effect of the resilience with second spring 9 of first spring 8, when filling into unnecessary electrolyte, liquid extrusion shrouding 5, make the compression of second spring 9, first spring 8 is tensile, shrouding 5 moves corresponding position downwards in recess 6, the damage of naked electric core 2 has been avoided, fine inflation and the effect of buffering have been played, the expanded space has been increased, be favorable to prolonging lithium ion battery's life, piston 7 seals recess 6, and then seal shrouding 5, avoid the electrolyte to flow out, moreover, the steam generator is simple in structure, and is convenient to use.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. The utility model provides a lithium ion battery's packaging structure, includes shell (1), naked electric core (2) and top cap (3), its characterized in that: still include the expansion structure, the expansion structure includes connecting plate (4), shrouding (5), recess (6), piston (7), first spring (8) and second spring (9), naked electric core (2) bottom outside is around being equipped with connecting plate (4), recess (6) have been seted up to naked electric core (2) bottom, recess (6) inside is equipped with shrouding (5), shrouding (5) top fixedly connected with piston (7), piston (7) top fixedly connected with first spring (8), a set of second spring (9) of shrouding (5) bottom fixedly connected with.

2. The packaging structure of a lithium ion battery according to claim 1, wherein: the section of the sealing plate (5) is U-shaped.

3. The packaging structure of a lithium ion battery according to claim 1, wherein: the piston (7) is matched with the groove (6).

4. The packaging structure of a lithium ion battery according to claim 1, wherein: one end, far away from the piston (7), of the first spring (8) is fixedly connected with the top of the groove (6).

5. The packaging structure of a lithium ion battery according to claim 1, wherein: the other end of the second spring (9) is fixedly connected with the bottom of the shell (1).