KR102277225B1 - Separable Battery Case with Receiving Portion and Process for Preparation of Battery Cell - Google Patents

Abstract

The present invention is a method of manufacturing a battery cell, (a) a first case in which n (n≥2) first accommodating parts are formed in a line to accommodate an electrode assembly having a positive electrode/separator/negative electrode structure; preparation process; (b) mounting an electrode assembly to each of the first accommodating parts; (c) manufacturing a unit battery case by forming a heat-sealing sealing part in a state in which the second case is positioned so as to coincide with the outer side of the first case; (d) cutting the battery case for each part corresponding to the unit battery; (e) after injecting the electrolyte into the inside of each case cut out in the process (d), forming a heat-sealing sealing part in the injection part and sealing the battery cell manufacturing method comprising a process and a battery cell manufactured by the method will be.

Description

Separable battery case with receiving part and manufacturing method of battery cell using same {Separable Battery Case with Receiving Portion and Process for Preparation of Battery Cell}

The present invention relates to a detachable battery case having a receiving part and a method for manufacturing a battery cell using the same.

With the development and increase of demand for mobile devices, the demand for secondary batteries is also rapidly increasing. Among them, lithium secondary batteries with high energy density and operating voltage and excellent preservation and lifespan characteristics are widely used in various electronic products as well as various mobile devices. It is widely used as an energy source.

Typically, in terms of battery shape, there is a high demand for prismatic secondary batteries and pouch-type secondary batteries that can be applied to products such as mobile phones with thin thickness, and in terms of materials, they have advantages such as high energy density, discharge voltage, and output stability. Demand for lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries is high.

Recently, a pouch-type battery having a structure in which a stack-type or stack-folding electrode assembly is embedded in a pouch-type battery case of an aluminum laminate sheet is attracting a lot of attention due to low manufacturing cost, small weight, easy shape deformation, etc. Also, its usage is gradually increasing.

Such a pouch-type battery forms a housing part on a battery case made of a laminate sheet in the manufacturing process of the battery cell, and the battery case is cut off so that it can be used in a unit cell. The electrode assembly is stored on the battery case cut out to be used as a unit battery. will go through the process of

In addition, the pouch-type battery undergoes a process of activating the battery by charging and discharging in the manufacturing process of the battery cell. In order to manufacture the final battery cell, it is necessary to remove the gas generated in the activation process, which is performed by degassing. It's called fair

At this time, in the empty space existing inside the battery case, a shape (Rabin part) in which the battery case enters the inner direction in which the electrode assembly is accommodated appears in the process of applying a vacuum in the degassing process, so that the appearance is not distorted or wrinkled. occurs, and this phenomenon becomes more problematic in the process of manufacturing a battery cell by bending a battery case made of one unit member.

Accordingly, there is a high need for a technology capable of fundamentally solving these problems.

An object of the present invention is to solve the problems of the prior art as described above and the technical problems that have been requested from the past.

After repeated in-depth research and various experiments, the inventors of the present application, as will be described later, after mounting the electrode assembly in the housing formed in any one of the two separate battery cases, the unit after thermal fusion sealing By sequentially performing the cutting process for each battery, it was confirmed that the above problems can be solved at once, and the present invention was completed.

As a method of manufacturing a battery cell for achieving this object,

(a) preparing a first case in which n (n≥2) first accommodating parts are formed in a line to accommodate an electrode assembly having a cathode/separator/cathode structure;

(b) mounting an electrode assembly to each of the first accommodating parts;

(c) manufacturing a unit battery case by forming a heat-sealing sealing part in a state where the outer side of the first case coincides with the outer side of the second case;

(d) cutting the battery case for each part corresponding to the unit battery;

(e) after injecting the electrolyte into the inside of each case cut out in the process (d), the process of sealing by forming a heat-sealing sealing part in the injection part;

includes

Therefore, in the manufacturing method according to the present invention, since there is no need to bend the battery case made of one unit member, the appearance of the battery case is dented as the battery case enters inward at the lower end of the first housing in which the electrode assembly is accommodated. or to prevent wrinkles.

In this case, the battery case cut for each part corresponding to the unit cell in the process (d) may be cut to a size including the electrode assembly and the gas pocket.

In one specific example, in the process (c), the heat-sealing sealing part is formed between the first sealing part formed on the outer peripheral surfaces of the first case and the second case, and n-1 second accommodating parts formed between the n first accommodating parts. It may have a structure including a sealing part.

Here, it can be understood that the first sealing part is formed by thermally sealing the overlapping portions of the outer peripheral surfaces in a state in which the outer periphery of the first case and the outer periphery of the second case are matched, and the second sealing part is formed of n electrode assemblies. 1 It can be understood as a part sealed to cut out the battery case in the state accommodated in the storage unit for each unit cell.

Specifically, the distance between the second sealing parts may be a structure formed to have a constant size so that a battery cell of a uniform size can be manufactured, and in the process (d), the battery case is formed by using the central part of the second sealing part as a perforation line. can be stolen

On the other hand, since the battery cell manufactured by the manufacturing method in the present invention is sometimes used for a battery of a compact size, the electrode terminals of each of the electrode assemblies are positioned together on one side of the battery case and protrude to the outside of the battery case. The structure may be accommodated.

In one specific example, the second case may have a structure in which second accommodating parts corresponding to respective accommodating parts formed in the first case are formed.

At this time, when the battery cell manufacturing process is performed through the manufacturing method according to the present invention, the first accommodating part and the second accommodating part respectively formed in the two separate battery cases are not offset from each other in the overlapping process. won't

In order to achieve this more effectively, in the first case, each of the second accommodating parts is aligned with the first accommodating parts so that the outer side of the first case and the outer side of the second case can coincide with each other without shifting in the process (c). The first reference points may be formed so that they can be positioned, and the second reference points may be formed at positions corresponding to each of the first reference points in the second case.

For example, each of the first reference points and the second reference points may be a through hole formed by drilling the first case and the second case.

This reference point allows the electrode assembly accommodated in the first housing part of the first case to be wrapped in a state where the second housing part of the second case is positioned properly, so that it is possible to manufacture a battery cell having a uniform appearance.

Meanwhile, the following process (f) may be further included after the process (e).

(f) The process of bending the sealing part adjacent to or facing one side where the electrode lead is located.

The present invention also provides a battery cell manufactured by the manufacturing method, a battery pack including at least one of the battery cells, and a device including the battery pack as a power source.

On the other hand, the device, for example, a notebook computer, a netbook, a tablet PC, a mobile phone, an MP3, a wearable electronic device, a power tool (power tool), an electric vehicle (Electric Vehicle, EV), a hybrid electric vehicle (Hybrid Electric Vehicle, HEV), Plug-in Hybrid Electric Vehicle (PHEV), electric bicycle (E-bike), electric scooter (E-scooter), electric golf cart, or system for power storage and the like, but is not limited thereto, of course.

Since the structure and manufacturing method of such a device are known in the art, a detailed description thereof will be omitted herein.

As described above, in the method for manufacturing a battery cell according to the present invention, since it is not necessary to bend the battery case made of one unit member, the battery case is moved inward from the lower end of the first accommodating part in which the electrode assembly is accommodated. It prevents the appearance of dents or wrinkles as it enters, and provides an effect of not shifting from each other in the process of overlapping the first and second accommodating parts respectively formed in the two separate battery cases.

1 to 4 are schematic diagrams of a process for manufacturing a battery cell according to an embodiment of the present invention;
5 is a schematic diagram of a process for manufacturing a battery cell according to another embodiment of the present invention.

Hereinafter, although described with reference to the drawings according to the embodiment of the present invention, this is for easier understanding of the present invention, and the scope of the present invention is not limited thereto.

1 to 4 schematically show processes for manufacturing a battery cell according to an embodiment of the present invention.

1 shows a first case in which a first accommodating part for accommodating the electrode assembly is formed, and FIG. 2 shows a process of mounting the electrode assembly in the first accommodating part of the first case.

Referring to FIG. 1 , the first accommodating parts 101 , 102 , 103 , and 104 are formed in a line on the first case 100 while maintaining a constant distance therebetween.

Referring to FIG. 2 , the electrode assemblies 10 , 20 , 30 , and 40 are mounted in the corresponding first receiving portions 101 , 102 , 103 and 104 , respectively.

FIG. 3 illustrates a process in which the second case is positioned on top of the first case in order to seal the electrode assembly from the outside in a state in which the electrode assembly is mounted on the first housing.

Referring to FIG. 3 , electrode assemblies 10 , 20 , 30 , 40 are mounted in each of the first accommodating parts 101 , 102 , 103 , 104 formed in the first case 100 , and the electrode assembly As a pre-step for sealing the ones 10, 20, 30, and 40 from the outside, the second case 200 is placed on the upper portion so as to coincide with the outer side of the first case 100 and then covered.

Referring to FIG. 4 , a process of manufacturing a battery case of one unit by heat-sealing the second case to the first case, and then cutting the case is schematically shown.

In a state in which the second case 200 coincides with the outer periphery of the first case 100 so that the outer periphery overlaps, the overlapped portion is thermally fused to form the first sealing portion 120 .

Second sealing parts 130 are formed between the first accommodating parts 101 , 102 , 103 , and 104 for cutting the battery case for each part corresponding to the unit battery.

After the sealing parts 120 and 130 are formed by thermal fusion, the battery case is cut along the second sealing part 130 .

A battery cell is manufactured by injecting an electrolyte into each cut-out battery case, forming a heat-sealing sealing part in the injection part to seal it, and then performing a process of charging and discharging the electrode assemblies to activate the battery cell.

5 schematically shows a process for manufacturing a battery cell according to another embodiment of the present invention.

Referring to FIG. 5 , electrode assemblies 10 , 20 , 30 , and 40 are respectively mounted on the first receiving portions 101 , 102 , 103 , and 104 formed on the first case 100 , and the electrode assembly Second accommodating parts 301 , 302 , 303 , 304 are formed on the second case 300 for sealing the ones 10 , 20 , 30 , and 40 from the outside.

In the first case 100 , each of the second accommodating parts 301 , 302 , 303 , 304 of the second case 300 may be positioned in alignment with the first accommodating parts 101 , 102 , 103 , 104 . The first reference points 190 are formed so as to be there, and the second reference points 390 are formed in the second case 300 at positions corresponding to the first reference points 190 .

Although described above with reference to the drawings according to the embodiment of the present invention, those skilled in the art to which the present invention pertains will be able to make various applications and modifications within the scope of the present invention based on the above content.

Claims (13)

A method for manufacturing a battery cell, comprising:
(a) preparing a first case in which n (n≥2) first accommodating parts are formed in a line so as to accommodate an electrode assembly having a cathode/separator/cathode structure;
(b) mounting an electrode assembly in each of the first accommodating parts;
(c) manufacturing a unit battery case by forming a heat-sealing sealing part in a state where the outer side of the first case coincides with the outer side of the second case;
(d) cutting the battery case for each part corresponding to the unit battery;
(e) after injecting the electrolyte into the inside of each case cut out in step (d), forming a heat-sealing sealing part in the injection part and sealing,
In the second case, second accommodating parts corresponding to the accommodating parts formed in the first case are formed,
In the process (c),
First reference points are formed in the first case so that each of the second accommodation units can be positioned in alignment with the first accommodation portions, and the second reference points are formed in the second case at positions corresponding to the first reference points, respectively. is formed,
The heat-sealing sealing part includes a first sealing part formed on the outer peripheral surfaces of the first case and the second case, and n-1 second sealing parts formed between the n first accommodating parts,
In the process (d), the battery cell manufacturing method, characterized in that the battery case is cut by using the central part of the second sealing part as a perforation line. The method according to claim 1, wherein in the step (d), the unit cell includes an electrode assembly and a gas pocket. delete The method according to claim 1, wherein a distance between the second sealing parts is formed to have a constant size. delete The method according to claim 1, wherein the electrode terminals of each of the electrode assemblies are accommodated to protrude to the outside of the battery case while being positioned together at one side of the battery case. delete delete The method according to claim 1, wherein each of the first and second reference points is a through hole formed by perforating the first case and the second case. The method according to claim 1, further comprising the following process (f) after the process (e):
(f) The process of bending the sealing part adjacent to or facing one side where the electrode lead is located. delete delete delete

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