KR20230108626A - Tray For Charge And Discharge Of Battery Cell - Google Patents

Abstract

The present invention relates to a tray for an activation process of a pouch-type battery cell, and more particularly, to accommodate a pouch-type battery cell; and an elastic member positioned on an inner surface of the bottom of the body and in close contact with a portion of the pouch-type battery cell.

Description

Tray for activation process of pouch type battery cell {Tray For Charge And Discharge Of Battery Cell}

The present invention relates to a tray for an activation process of a pouch-type battery cell, and more particularly, an elastic member capable of supporting the lower portion of the pouch-type battery cell is provided on the inner surface of the bottom of the body portion, so that the pouch-type battery cell during the activation process The present invention relates to a tray for an activation process of a pouch-type battery cell, which can prevent deformation of the bottom of the battery cell and furthermore, prevent damage by absorbing shock when the battery cell is inserted.

As technology development and demand for mobile devices increase, secondary batteries capable of charging and discharging are used as energy sources for various mobile devices. Secondary batteries are attracting attention as an energy source for electric vehicles, hybrid electric vehicles, etc., which are proposed as alternatives to existing gasoline vehicles and diesel vehicles using fossil fuels.

Lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries, etc. are known as secondary batteries, and cylindrical batteries in which an electrode assembly is embedded in a cylindrical or prismatic metal can depending on the shape of the battery case and a prismatic battery and a pouch-type battery in which the electrode assembly is embedded in a pouch-type case of an aluminum laminate sheet.

On the other hand, in manufacturing a lithium secondary battery, after preparing a positive electrode active material and a negative electrode active material in which an active material and a binder are mixed, the positive electrode and the negative electrode are prepared by applying them to the positive electrode current collector and the negative electrode current collector, respectively, and stacking them on both sides of the separator to prepare a predetermined Shaped battery cells are formed.

Then, the battery cell is inserted into the battery case, sealed, and an activation process is performed. The activation process is a process in which the battery is activated and gas is removed by repeating charging and discharging. During charging, lithium ions from the lithium metal oxide used as the positive electrode move to the carbon electrode used as the negative electrode and are inserted into the carbon electrode. It reacts at the cathode to form compounds such as Li2CO3, LiO, and LiOH to form a solid electrolyte interface (SEI) film on the surface of the cathode.

However, since this activation process proceeds with the battery cell standing vertically, the load is concentrated downward, and the case may be not only deformed but also damaged due to gas generated during the charging and discharging process.

In this regard, prior literature discloses a tray for a charger/discharger having a battery cell fixing function.

1 is a perspective view of a tray for a charger and discharger having a battery cell fixing function according to the prior art. As shown in FIG. 1, a tray for a charger/discharger having a battery cell fixing function has an accommodation space 11 formed therein and an upper portion thereof being opened, and a plurality of battery cells 2 are mounted in the accommodation space 11. The tray 10, and a plurality of fixing holes 21 are formed so as to correspond to the positions where each battery cell 2 is mounted, and each battery cell 2 is installed on the open top of the tray 10. It is configured to include a fixing plate 20 installed to be inserted into (21).

Therefore, it is possible to accommodate a plurality of battery cells, but a configuration for preventing lower deformation of the battery cells is not disclosed.

Korean Patent Publication No. 2015-0049972

In the present invention for solving the above problems, an object of the present invention is to provide a tray for the activation process of a pouch-type battery cell equipped with a function to prevent deformation of the lower part of the battery cell during the activation process of the pouch-type battery cell. .

The tray for the activation process of the pouch-type battery cell according to the present invention for solving the above problems has an open top so as to accommodate the pouch-type battery cell 100, and has a first storage space (S1) inside. Provided body portion 210; and an elastic member 220 located on the inner surface of the bottom of the body 210 and in close contact with a portion of the pouch-type battery cell 100.

In addition, in the tray for the activation process of the pouch-type battery cell according to the present invention, the body portion 210 has a hexahedral shape, and the pouch-type battery cell 100 accommodated in the first storage space S1 is positioned upright. It is characterized in that a plurality of protrusions 211 are positioned while facing each other on the inner surface of the body portion 210 so as to be able to do so.

In the tray for the activation process of the pouch-type battery cell according to the present invention, the protrusions 211 are characterized in that they are continuously formed along the height direction of the body portion 210.

In the tray for the activation process of the pouch-type battery cell according to the present invention, the outer surface of the protruding part 211 and the inner surface of the body part 210 form a right angle with the inner surface of the bottom of the body part 210.

In the tray for the activation process of the pouch-type battery cell according to the present invention, the elastic member 220 is composed of at least one of polyurethane foam, expanded polystyrene (EPS), and extruded polystyrene (XPS). characterized by

In the tray for the activation process of the pouch-type battery cell according to the present invention, the elastic member 220 has an upper surface 221 in close contact with the lower part of the pouch-type battery cell 100, an inner surface or a protrusion of the body part 210 (211) It is characterized in that it has a hexahedral shape composed of a side surface 222 in close contact with the outer surface and a bottom surface 223 in close contact with the bottom inner surface of the body portion 210.

In the tray for the activation process of the pouch-type battery cell according to the present invention, the upper surface 221 and the bottom surface 223 of the elastic member 220 are parallel to the bottom inner surface of the body portion 210.

In the tray for the activation process of the pouch-type battery cell according to the present invention, the bottom surface 223 of the elastic member 220 is provided with a second storage space S2 toward the top surface 221, and the second storage space (S2) is characterized in that the spring 230 is accommodated.

In the tray for the activation process of the pouch-type battery cell according to the present invention, an inclined surface 224 is formed at a corner where the upper surface 221 and the side surface 222 of the elastic member 220 meet.

In the tray for the activation process of the pouch-type battery cell according to the present invention, a plurality of pouch-type battery cells 100 may be positioned side by side in the first storage space S1 of the body 210 while being spaced apart at predetermined intervals. It is characterized by having

According to the tray for the activation process of the pouch-type battery cell according to the present invention, an elastic member capable of supporting the lower portion of the pouch-type battery cell is provided on the inner surface of the bottom of the body portion to prevent deformation of the lower portion of the pouch-type battery cell during the activation process. There are advantages to avoiding or minimizing it.

In addition, according to the tray for the activation process of the pouch-type battery cell according to the present invention, since an elastic member is provided on the inner surface of the bottom of the body portion, there is an advantage in that shock is absorbed when the battery cell is inserted and thus damage can be prevented.

1 is a perspective view of a tray for a charger and discharger having a battery cell fixing function according to the prior art.
Figure 2 is a perspective view of a pouch-type battery cell accommodated in the tray of the present invention.
3 is a perspective view of a tray for an activation process of a pouch-type battery cell according to a preferred embodiment of the present invention.
FIG. 4 is a plan view of a state in which pouch type battery cells are accommodated in the tray shown in FIG. 3 .
5 is a cross-sectional view taken along line AA′ of FIG. 4 .
6 is a cross-sectional view of an elastic member according to an embodiment mounted on a tray of the present invention.
7 is a cross-sectional view of an elastic member according to a modified embodiment mounted on a tray of the present invention.

In this application, terms such as "comprise", "have" or "have" are intended to indicate that there is a feature, number, step, component, part, or combination thereof described in the specification, but one or more other It should be understood that it does not preclude the possibility of addition or existence of features, numbers, steps, operations, components, parts, or combinations thereof.

In addition, the same reference numerals are used for parts having similar functions and actions throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only the case where it is directly connected, but also the case where it is indirectly connected with another element interposed therebetween. In addition, including a certain component does not exclude other components unless otherwise stated, but means that other components may be further included.

Hereinafter, a tray for an activation process of a pouch type battery cell according to the present invention will be described.

Figure 2 is a perspective view of a pouch-type battery cell accommodated in the tray of the present invention.

Referring to FIG. 2, the battery cell 100, which is activated through the tray for the activation process of the present invention, has a cell case 110, an electrode assembly stored inside the cell case 110, one side connected to the electrode assembly, and the other side connected to the electrode assembly. The side may include an electrode lead 120 protruding outward from the cell case 110 and an insulating film 130 attached to both upper and lower surfaces of the electrode lead 120 .

In detail, the cell case 110 may be composed of an upper case and a lower case, and a pocket-shaped space portion is provided to accommodate the electrode assembly.

The cell case 110 uses a laminate sheet composed of an outer coating layer, a metal layer, and an inner coating layer to form a space portion capable of accommodating the electrode assembly.

Since the inner coating layer is in direct contact with the electrode assembly, it must have insulation and electrolytic resistance, and must have excellent heat sealing strength for sealing with the outside.

Materials for the inner coating layer may be selected from polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, polyurethane resins, and polyimide resins, which have excellent chemical resistance and good sealing properties, but are not limited thereto, Polypropylene having excellent mechanical properties such as tensile strength, rigidity, surface hardness, and impact resistance and chemical resistance is most preferred.

A metal layer in contact with the inner coating layer corresponds to a barrier layer that prevents moisture or various gases from permeating into the battery from the outside, and a lightweight aluminum film having excellent formability can be used as a preferable material for the metal layer.

And, an outer coating layer is provided on the other side of the metal layer, and the outer coating layer can use a heat-resistant polymer having excellent tensile strength, moisture permeability, and air permeability to secure heat resistance and chemical resistance while protecting the electrode assembly, For example, nylon or polyethylene terephthalate may be used, but is not limited thereto.

On the other hand, the electrode assembly accommodated inside the cell case 110 is a stacked electrode assembly in which a plurality of electrodes are stacked, a jelly-roll type electrode assembly in a wound state with a separator interposed between the positive electrode and the negative electrode, and a plurality of units. It can be classified into a lamination/stack type electrode assembly in which cells are stacked, and a stack/folding type electrode assembly in which unit cells are wound while positioned on a separator sheet.

A unit cell is manufactured to manufacture the lamination/stack type electrode assembly and the stack/folding type electrode assembly. The unit cell includes a mono-cell in the form of a separator interposed between an anode and a cathode, an anode, It may be in the form of a bi-cell in which a cathode and an anode, or a cathode, an anode and a cathode are stacked, and a separator is interposed between the anode and the cathode.

The electrode assembly according to the present invention may have a structure in which a cathode/separator/anode/separator/cathode are stacked, and in addition, the number of anodes and cathodes constituting the electrode assembly can be freely set and used. In addition, a lamination/stack type electrode assembly in which a plurality of unit cells are laminated may be used. The structure of the electrode assembly may be applied to all of the electrode assemblies described in this specification.

The positive electrode and the negative electrode of the electrode assembly are provided with a positive electrode tab and a negative electrode tab, respectively, and the pair of tabs are connected to a pair of electrode leads 120 by spot welding and have a predetermined length outside the cell case 110. arranged to protrude.

In addition, the insulating film 130 is located around the pair of electrode leads 120, more specifically, at the sealing portion where the upper case and the lower case are heat-sealed to fix the electrode lead 120 to the cell case 110. .

Therefore, electricity generated from the electrode assembly is prevented from flowing to the cell case 110 through the electrode lead 120 and the sealing of the cell case 110 is maintained. On the other hand, the insulating film 130 is preferably made of a non-conductive material that does not conduct electricity well, and generally uses an insulating tape that is easy to attach to the electrode lead 120 and has a relatively thin thickness, but is not limited thereto.

3 is a perspective view of a tray for an activation process of a pouch-type battery cell according to a preferred embodiment of the present invention, FIG. 4 is a plan view of a pouch-type battery cell stored in the tray shown in FIG. 3, and FIG. 5 is a plan view of FIG. This is a cross-sectional view taken along line A-A´.

Referring to FIGS. 3 to 5 , the tray for the battery cell activation process of the present invention includes a body portion 210 and an elastic member 220 .

The upper portion of the body portion 210 is open, and a first storage space S1 is provided to accommodate one or more pouch-type battery cells 100 therein.

Specifically, the exterior of the body portion 210 is a hexahedral shape with a substantially rectangular structure, and has a longitudinal direction (X-axis direction) to accommodate and fix the pouch-type battery cell 100 stored in the first storage space (S1). Accordingly, a plurality of protrusions 211 positioned facing each other are formed on both sides of the inner side.

That is, both edges of the pouch-type battery cell 100 are fixed by the protrusions 211 facing each other.

Here, it is preferable that the protrusions 211 formed on the same inner surface are spaced at a predetermined interval, more specifically, similar to the thickness of the pouch-type battery cell 100, which is due to the left and right movement of the pouch-type battery cell 100 during the activation process. is to suppress

In particular, it is preferable that the protrusions 211 are formed continuously along the height direction of the body 210, and the outer surface of the protrusions 211 and the inner surface of the body 210 are connected to the bottom inner surface of the body 210. It is more preferable to form a right angle.

During the activation process of the pouch-type battery cell 100, charging and discharging are repeatedly performed, and at this time, deformation such as swelling of the battery cell 100 occurs due to gas generated by an irreversible reaction.

However, in the tray of the present invention, the protrusions 211 are continuously formed in the height direction of the body 210, and the outer surface of the protrusions 211 and the inner surface of the body 210 are at right angles to the inner surface of the bottom of the body 210. Since it forms, it is possible to minimize the deformation of the battery cell 100 in an upright state.

The following is to prevent deformation of the pouch-type battery cell, in particular, deformation of the lower portion during the activation process. 6 is a cross-sectional view of an elastic member according to an embodiment mounted on a tray of the present invention.

Referring to FIGS. 2 to 6 together, the elastic member 220 is positioned between the inner surface of the bottom of the body 210 and the protrusions 211 described above.

The elastic member 220 may have a hexahedral shape composed of an upper surface 221, a side surface 222, and a bottom surface 223 (in FIG. 6 (a) is a front view viewed from the X-Y plane of FIG. 3, (b) is the front view from the Y-Z plane).

Specifically, the upper surface 221 supports the lower portion of the pouch-type battery cell 100 when the pouch-type battery cell 100 is accommodated in the first storage space S1 of the body portion 210, and has four side surfaces. (222) is in close contact with the inner surface of the body portion 210 or the outer surface of the projection (211). And the bottom surface 223 comes into close contact with the inner surface of the bottom of the body portion 210 .

Here, the elastic member 220 is not particularly limited as long as it has a cushion capable of preventing deformation while supporting the lower end of the pouch-type battery cell, but polyurethane foam, expanded polystyrene (EPS), and extruded polystyrene ( XPS, extruded polystyrene) and the like.

In particular, an inclined surface 224 is formed at the corner where the upper surface 221 and the side surface 222 of the elastic member 220 meet, so that the area of the upper surface 221 is smaller than the lower end cross section of the pouch-type battery cell 100. It is preferable. This is because the edge portion of the lower end of the cell case 110 protrudes somewhat downward, and thus deformation near the edge of the battery cell 100 can be further prevented.

On the other hand, it is advantageous that the upper surface 221 and the bottom surface 223 of the elastic member 220 are parallel to the bottom inner surface of the body part 210 so as to support the lower part of the pouch-type battery cell 100 as horizontally as possible. .

7 is a cross-sectional view of an elastic member according to a modified embodiment mounted on a tray of the present invention.

As shown in FIG. 7, the deformed elastic member 220 has a second storage space S2 on the bottom surface 223 toward the top surface 221, and one or more springs in the second storage space S2. As the 230 is accommodated, the lower portion of the pouch type battery cell 100 can be supported.

Specifically, the deformed elastic member 220 has an upper surface 221, a side surface 222, a bottom surface 223, and an upper surface 221 and a side surface ( 222) may have a hexahedral shape composed of inclined surfaces 224 at the corners where they meet ((a) in FIG. 7 is a front view as seen from the X-Y plane of FIG. 3, and (b) is a front view as viewed from the Y-Z plane).

On the other hand, since the material of the elastic member 220 is the same as the elastic member according to the embodiment described with reference to FIG. 6, overlapping descriptions will be described.

As above, specific parts of the present invention have been described in detail, to those skilled in the art, these specific descriptions are only preferred embodiments, and the scope of the present invention is not limited thereby, and the scope of the present invention It is obvious to those skilled in the art that various changes and modifications are possible within the scope and scope of the technical idea, and it goes without saying that these changes and modifications fall within the scope of the appended claims.

100: battery cell
110: cell case
120: electrode lead
130: insulating film
200: tray
210: body part 211: protrusion part
220: elastic member
221: top surface 222: side surface
223 bottom surface 224 inclined surface
230: spring
S: storage space
S1: first storage space
S2: Second storage space

Claims (10)

A body portion having a first storage space therein with an upper portion open to accommodate a pouch-type battery cell; and
The tray for the activation process of the pouch-type battery cell, characterized in that it comprises; an elastic member located on the inner surface of the bottom of the body portion and in close contact with a portion of the pouch-type battery cell.
According to claim 1,
The body has a hexahedral shape, and a plurality of protrusions are positioned on the inner surface of the body while facing each other so that the pouch-type battery cell stored in the first storage space can be positioned upright. Activation of the pouch-type battery cell, characterized in that process tray.
According to claim 2,
The tray for the activation process of the pouch-type battery cell, characterized in that the protrusion is formed continuously along the height direction of the body portion.
According to claim 3,
The tray for the activation process of the pouch-type battery cell, characterized in that the outer surface of the protrusion and the inner surface of the body form a right angle with the inner surface of the bottom of the body.
According to claim 1,
The elastic member is a tray for the activation process of a pouch-type battery cell, characterized in that composed of at least one of polyurethane foam, expanded polystyrene (EPS), and extruded polystyrene (XPS).
According to claim 5,
The elastic member has a hexahedral shape composed of an upper surface in close contact with the lower part of the pouch-type battery cell, a side surface in close contact with the inner surface of the body or an outer surface of the protrusion, and a bottom surface in close contact with the inner surface of the bottom of the body. A tray for the activation process of molded battery cells.
According to claim 6,
The tray for the activation process of the pouch-type battery cell, characterized in that the upper surface and the bottom surface of the elastic member are parallel to the bottom inner surface of the body portion.
According to claim 7,
A tray for an activation process of a pouch-type battery cell, characterized in that a second storage space is provided on the bottom surface of the elastic member toward the upper surface, and a spring is stored in the second storage space.
According to claim 7 or 8,
A tray for the activation process of a pouch-type battery cell, characterized in that an inclined surface is formed at the corner where the upper surface and the side surface of the elastic member meet.
According to claim 2,
A tray for an activation process of a pouch-type battery cell, characterized in that a plurality of pouch-type battery cells can be located side by side in the first storage space of the body part spaced apart from each other at a predetermined interval.

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