Heat-sealing packaging device of soft package lithium battery

Abstract

The utility model relates to the field of lithium battery production and manufacturing, in particular to a heat-sealing packaging device of a soft package lithium battery, which comprises a sealing head structure and a forming block, the sealing head structure comprises an upper sealing head and a lower sealing head; the upper sealing head and the lower sealing head are used for being close to each other to at least package tabs of the lithium battery; the forming block comprises an upper forming block and a lower forming block, and the upper forming block is connected with the upper sealing head; the lower forming block is connected with the lower sealing head; the upper forming block and the lower forming block are oppositely arranged and are used for forming a transition area at the position, close to the lithium battery body, of the tab when approaching each other.

Description

Technical Field

[0001] The utility model relates to the field of lithium battery production and manufacturing, and in particular, to a heat-sealing packaging device for a soft-pack lithium battery. Background Art

[0002] There are dynamic electrochemical reactions inside lithium-ion batteries, which are sensitive to moisture and oxygen. The organic solvents existing inside the battery cells, such as electrolytes, will quickly react with the lithium salts in the electrolyte when encountering water, oxygen, etc., affecting the electrochemical performance of the battery cells (such as capacity, cycle life). In order to increase the battery life, a soft-pack lithium battery packaging technology is proposed, using a high-barrier soft packaging material to completely isolate the inside of the battery cell from the outside, making the inside in a vacuum, oxygen-free, and water-free environment.

[0003] However, in the existing soft-pack lithium battery packaging technology, the packaging process at the position of the battery tab is not good, which easily affects the overall packaging quality of the lithium battery. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a heat-sealing packaging device for a soft-pack lithium battery, including a sealing head structure and a forming block; the sealing head structure includes an upper sealing head and a lower sealing head; the upper sealing head and the lower sealing head are used to approach each other to at least package the battery tab of the lithium battery; grooves are provided on one side of the upper sealing head and the lower sealing head away from the soft-pack lithium battery body, threaded holes are provided at the bottom of the grooves, and tab grooves communicating with the grooves are provided on one side of the upper sealing head and the lower sealing head opposite to each other; the forming block includes an upper forming block and a lower forming block, the upper forming block and the lower forming block are arranged oppositely, and are used to straighten and fix the tab when approaching each other; elliptical adjusting holes are provided at the positions corresponding to the threaded holes on the upper forming block and the lower forming block, and the upper forming block and the lower forming block are respectively fixed on the grooves of the upper sealing head and the lower sealing head through bolts.

[0005] In some embodiments of the utility model:

[0006] The upper forming block and the lower forming block are respectively lower than the upper sealing head and the lower sealing head in the moving direction.

[0007] In some embodiments of the utility model:

[0008] The forming block is made of brass.

[0009] In some embodiments of the utility model:

[0010] The upper forming block and the lower forming block each include a base body and an extrusion body; the surfaces of the extrusion bodies of the upper forming block and the lower forming block opposite to each other have a roughness not higher than Ra3.2 and no tool marks.

[0011] The technical solution of the utility model has at least the following beneficial effects:

[0012] The end of the tab of the lithium battery has better flatness and avoids the influence of heat radiation during the encapsulation process on the battery performance; during the encapsulation process, the wrinkling of the aluminum film is reduced, and the cost of heat-sealing encapsulation is lowered. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0014] Figure 1 It is a schematic structural view of a soft-pack lithium battery in an embodiment of the present invention;

[0015] Figure 2 It is a schematic structural view of a heat-sealing encapsulation device for a soft-pack lithium battery in an embodiment of the present invention;

[0016] Figure 3 It is a partial enlarged view of a heat-sealing encapsulation device for a soft-pack lithium battery in an embodiment of the present invention;

[0017] Figure 4 It is an exploded view of a heat-sealing encapsulation device for a soft-pack lithium battery in an embodiment of the present invention.

[0018] Figure 5 It is a schematic structural view of the head of a heat-sealing encapsulation device for a soft-pack lithium battery in an embodiment of the present invention;

[0019] In the figure: 10 - tab; 20 - body; 100 - encapsulation device; 110 - upper head; 120 - lower head; 130 - upper forming block; 140 - lower forming block; 141 - extrusion body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0022] It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it is not necessary to further define and explain it in subsequent drawings.

[0023] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "inner", "outer", "upper", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0024] Embodiment

[0025] An exemplary heat-sealed and encapsulated soft-pack lithium battery can be referred to Figure 1 , in the figure, the soft-pack lithium battery includes (a pair of) tabs 10 and a body 20, and the body 20 of the lithium battery is the battery cell.

[0026] Refer to Figure 2 , the present invention provides a heat-sealing and encapsulating device 100 for a soft-pack lithium battery, including a sealing head structure and a forming block; the sealing head structure includes an upper sealing head 110 and a lower sealing head 120. The upper sealing head 110 and the lower sealing head 120 are used to approach each other to at least encapsulate the tabs 10 of the lithium battery.

[0027] Refer to Figures 2 to 5 , in some embodiments of the present invention, grooves are provided on the sides of the upper sealing head 110 and the lower sealing head 120 away from the soft-pack lithium battery body 20, the depth of the grooves is 3-5 mm, and two threaded holes are provided at the bottom of the grooves. Grooves communicating with the tabs are provided on the opposite sides of the upper sealing head 110 and the lower sealing head 120. The tab grooves are precisely designed according to the width of the tab PP glue and the width of the tab shoulder, and after the aluminum-plastic film / tab is encapsulated, it is centered and flat, and the encapsulation effect is the best. When the upper sealing head 110 and the lower sealing head 120 are in contact, a pair of gaps are formed between the opposite tab grooves of the upper sealing head 110 and the lower sealing head 120, which are used to form a pair of tabs 10 of the lithium battery.

[0028] The forming blocks include an upper forming block 130 and a lower forming block 140, which are arranged oppositely. When they approach each other, they are used to straighten and fix the tab 10 at the position where the tab 10 is close to the body 20 of the lithium battery, reducing the warping, heat transfer and curling. Oval adjustment holes are provided at the positions corresponding to the threaded holes on both the upper forming block 130 and the lower forming block 140. The upper forming block 130 and the lower forming block 140 are respectively fixed on the grooves of the upper head 110 and the lower head 120 through bolts. In this embodiment, the upper forming block 130 and the lower forming block 140 are slightly smaller than the grooves of the corresponding upper head 110 and lower head 120. When the forming blocks are fixed, the relative positions of the forming blocks can be adjusted according to requirements, and then the forming blocks are fixed through bolts and adjustment holes, so as to avoid the edge sealing protrusions and better fix and inlay the upper forming block 130 and the lower forming block 140 on the head.

[0029] By setting the head structure and the forming blocks, the side of the tab 10 of the lithium battery close to the body 20 has better flatness, and the influence of heat radiation during the encapsulation process on the battery performance is avoided, reducing the wrinkling of the soft-pack aluminum film.

[0030] In some embodiments of the present invention, the upper forming block 130 and the lower forming block 140 are respectively lower than the upper head 110 and the lower head 120 in the moving direction. In some embodiments, the size of the groove can be 2.0mm * 3.8mm.

[0031] Since brass has good machining performance and heat conduction performance, in some embodiments of the present invention, the forming blocks are made of brass.

[0032] In some embodiments of the present invention, both the upper forming block 130 and the lower forming block 140 include a base body and an extrusion body 141; the surface of the extrusion body 141 of the upper forming block 130 and the lower forming block 140 facing each other has a roughness not higher than Ra3.2 and no tool marks are allowed. The surface of the extrusion body 141 of the upper forming block 130 and the lower forming block 140 facing each other is the working surface corresponding to form the transition zone. Therefore, according to actual needs, different shapes and sizes of the working surfaces can be set, and at the same time, its roughness is controlled not to be higher than Ra3.2 and no tool marks are allowed to ensure better processing effects.

[0033] Through the heat-sealing encapsulation device 100 of the above-mentioned soft-pack lithium battery, the side of the tab 10 of the lithium battery close to the body 20 has better flatness, and the influence of heat radiation during the encapsulation process on the battery performance is avoided, reducing the wrinkling of the soft-pack aluminum film. At the same time, during the heat-sealing encapsulation process, the labor cost can be saved by 0.00932 yuan / PCS, and the effect is objective.

[0034] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A heat-sealing packaging device for a soft-pack lithium battery, characterized in that: It includes a head structure and a forming block; The sealing head structure comprises an upper sealing head and a lower sealing head; the upper sealing head and the lower sealing head are used to be close to each other to at least encapsulate the tabs of the lithium battery; A groove is provided on one side of the upper and lower heads away from the body of the soft-pack lithium battery, a threaded hole is provided at the bottom of the groove, and a tab groove communicating with the groove is provided on one side opposite to the upper and lower heads; The forming block comprises an upper forming block and a lower forming block, and the upper forming block and the lower forming block are arranged opposite to each other and are used to fix the pole ear straightly when they are close to each other; The upper forming block and the lower forming block are both provided with elliptical adjustment holes at positions corresponding to the threaded holes, and the upper forming block and the lower forming block are respectively fixed to the grooves of the upper head and the lower head by bolts.

2. The heat-sealing packaging device for soft-pack lithium batteries according to claim 1, characterized in that: The upper forming block and the lower forming block are respectively lower than the upper sealing head and the lower sealing head in the moving direction.

3. The heat-sealing packaging device for soft-pack lithium batteries according to claim 1, characterized in that: The forming block is made of brass.

4. The heat-sealing packaging device for a soft-pack lithium battery according to claim 1, characterized in that: The upper forming block and the lower forming block both include a base body and an extrusion body; the roughness of one side of the extrusion body opposite to the upper forming block and the lower forming block is not higher than Ra3.2 and no knife marks are allowed.

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