KR20170100971A - Process for Preparing Battery Cell Comprising Clamping and Baking Step - Google Patents

Abstract

The present invention provides a method of producing a battery cell, comprising the processes of: a) preparing a primary battery cell having a structure in which an electrode assembly including a positive electrode, a negative electrode, and a separation film is introduced with an electrolyte solution into a battery case; b) performing a first aging process by maintaining the electrolyte solution to be impregnated in the electrode assembly; c) subjecting the primary battery cell to an initial charging with a fixed voltage; d) subjecting the primary battery cell to a second aging process and a third aging process by maintaining the primary battery cell sequentially at different temperature ranges; e) removing gas from the inside of the primary battery cell and sealing the same; f) performing a clamping-and-baking process by applying fixed temperature and pressure so as to adjust the thickness of the primary battery cell; and g) adjusting the primary battery cell to have a predetermined output voltage by charging and discharging the primary battery cell, to prepare a final battery cell thereby.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing a battery cell including a clamping and baking process,

The present invention relates to a method of manufacturing a battery cell including a cold clamping and baking process.

In recent years, the demand for environmentally friendly alternative energy sources has become an indispensable factor for the future, as the increase in the price of energy sources due to depletion of fossil fuels and the interest in environmental pollution are amplified. Various researches on power generation technologies such as nuclear power, solar power, wind power, and tidal power have been continuing, and electric power storage devices for more efficient use of such generated energy have also been attracting much attention.

Particularly, as technology development and demand for mobile devices are increasing, the demand for batteries as energy sources is rapidly increasing, and accordingly, a lot of researches on batteries that can meet various demands have been conducted.

Typically, in terms of the shape of a battery, there is a high demand for a prismatic secondary battery and a pouch-type secondary battery which can be applied to products such as mobile phones with a small thickness, and has advantages such as high energy density, discharge voltage, There is a high demand for lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries.

Also, the secondary battery is classified according to the structure of the electrode assembly having the positive electrode, the negative electrode, and the separator interposed between the positive electrode and the negative electrode. Typically, the long battery- A stacked (stacked) electrode assembly in which a plurality of positive electrodes and negative electrodes cut in a predetermined size unit are sequentially stacked with a separator interposed therebetween, the jelly-roll type (wound type) electrode assembly having a structure in which a separator is interposed; In recent years, in order to solve the problems of the jelly-roll type electrode assembly and the stack type electrode assembly, an electrode assembly having an advanced structure, which is a combination of the jelly-roll type and the stack type, A stack / folding type electrode having a structure in which unit cells stacked with a separator interposed between an anode and a cathode are sequentially wound while being placed on a separation film Developed body lip.

The secondary battery includes a cylindrical battery and a prismatic battery in which the electrode assembly is housed in a cylindrical or rectangular metal can according to the shape of the battery case, and a pouch type battery in which the electrode assembly is housed in a pouch-shaped case of an aluminum laminate sheet .

In particular, in recent years, a pouch-shaped battery having a structure in which a stacked or stacked / folded electrode assembly is embedded in a pouch-shaped battery case of an aluminum laminate sheet has attracted much attention due to low manufacturing cost, small weight, And its usage is gradually increasing.

1 is an exploded perspective view schematically showing a structure of a conventional pouch-shaped battery cell.

1, the pouch-shaped battery cell 100 includes an electrode assembly 130, electrode tabs 131 and 132 extending from the electrode assembly 130, electrodes (electrodes) 131 and 132 welded to the electrode tabs 131 and 132, Leads 140 and 141, and a battery case 120 that accommodates the electrode assembly 130. [

The electrode assembly 130 is a power generation element in which an anode and a cathode are sequentially stacked with a separation membrane interposed therebetween, and has a stacked or stacked / folded structure. The electrode tabs 131 and 132 extend from the respective electrode plates of the electrode assembly 130 and the electrode leads 140 and 141 are formed by a plurality of electrode tabs 131 and 132 extending from the respective electrode plates, And they are partially exposed to the outside of the battery case 120. [0051] An insulating film 150 is attached to a portion of the upper and lower surfaces of the electrode leads 140 and 141 in order to increase the degree of sealing with the battery case 120 and at the same time to secure an electrically insulated state.

The battery case 120 includes a case body 122 including a concave shaped storage portion 123 on which the electrode assembly 130 can be placed and a lid 121 integrally connected to the body 122 And the electrode assembly 130 is housed in the housing part 123 and the side parts 124 and the upper part 125, which are the contact parts, are joined to each other to complete the battery. The battery case 120 is made of an aluminum laminate structure of a resin outer layer / barrier metal layer / heat-sealable resin sealant layer and has a lid 121 which contacts with each other, both side portions 124 of the main body 122, And the resin layers are fused to each other to form bonded sealing surplus portions. Both side portions 124 are in direct contact with the same resin layers of the upper and lower battery case 120, so that they can be uniformly sealed by melting. Since the electrode leads 140 and 141 protrude from the upper end portion 125 of the battery case 120 in consideration of the thickness of the electrode leads 140 and 141 and the material of the battery case 120, And the leads 140 and 141 are thermally fused with the insulating film 150 interposed therebetween.

In general, a pouch-shaped battery cell having such a structure is manufactured by preparing a primary battery cell having a structure in which an electrode assembly and an electrolyte are housed in a battery case, an aging process for the primary battery cell, An aging process for charging and discharging the cell, a degassing process for removing the gas generated in the aging process and the charge and discharge process, and the like.

FIG. 2 is a graph illustrating a change in voltage level according to each process of a conventional battery cell manufacturing method.

Referring to FIG. 2, a primary battery cell having a structure in which an electrode assembly including an anode, a cathode, and a separation membrane is introduced into a battery case together with an electrolyte solution is first aged 201 by maintaining an electrolyte solution impregnated in the electrode assembly.

Thereafter, the primary battery cell is initially charged 202 at a voltage of about 3.7 V, and clamping & baking is performed by applying a predetermined temperature and pressure to adjust the thickness of the primary battery cell. (203).

The primary battery cells that have undergone the clamping-bake process 203 are sequentially subjected to a secondary aging process 204 and a tertiary aging process 205 in a different temperature range, respectively, and are spontaneously discharged.

Thereafter, the primary battery cell is regulated (206) to the set shipping voltage in the state where the full discharge and the full charge are performed.

The primary battery cell is subjected to a degassing process 207 for removing gases generated in the aging process 201, 204, 205 and the charge and discharge processes 202, 206, thereby preparing a final battery cell.

However, even though these aging processes 201, 204, 205 and the charge and discharge processes 202, 206 can be performed in the same apparatus or tray, the clamping- , 205 and the charging and discharging processes 202 and 206. Therefore, in the process of moving the apparatus or the tray for performing the clamping-bake process 203, The position can be changed.

Therefore, it is difficult to accurately identify at which position the failure occurs in the primary battery cell through the aging process (201, 204, 205) and the charge / discharge process (202, 206) even if the failure of the battery cell is detected .

In some cases, the positions of the primary battery cell in the apparatus or the tray where the aging process 201, 204, 205 and the charge / discharge process 202, 206 are performed are separately displayed so as to prevent such difficulties. Since the display process must be performed for all of the primary cells, the display process is very cumbersome, and as the cost and time required for the display process are increased, the overall cost and time required for manufacturing the battery cell increase .

Since the thickness of the primary battery cell changes during the aging process 201, 204, 205 and the initial charging process 202, the primary battery cell is subjected to the aging process 204, 205 after the clamping- It is difficult to predict the thickness of the battery cell, which makes it difficult to set the optimum clamping-baking condition for the uniform thickness formation of the battery cell, and accordingly, the rate of defectiveness to the thickness of the battery cell can be increased.

Further, in order to uniformly form the final thickness of the primary battery cell, a part of the electrolyte is discharged along with the internal gas during the degassing process, so that an excessive amount of the electrolyte can be discharged in this process, There is a problem that can be deteriorated.

Therefore, there is a high need for a technique capable of fundamentally solving such problems.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

The inventors of the present application have conducted intensive research and various experiments. As a result, after the process of clamping and baking the primary battery cell is performed after the gas removing and sealing process, It is not necessary to separately display each position in the device or the tray in which the aging process and the charge and discharge process are performed. Therefore, it is possible to save the cost and time required for manufacturing the battery cell, and immediately after the clamping- It is possible to more easily set the conditions optimized for performing the clamping-baking process, and it is also possible to set the thickness of the primary battery cell It is possible to easily predict the thickness of the primary battery cell changed by the subsequent clamping-baking process The gas removal and sealing process can be simplified, and the gas or bubbles which can not be removed in the gas removal and sealing process can be removed in the subsequent clamping-baking process, and at the same time, , It has been found that the problem of deterioration of the performance of the battery cell can be prevented because it is not necessary to excessively discharge the electrolyte inside the battery cell to uniformly form the thickness of the battery cell.

According to an aspect of the present invention, there is provided a method of manufacturing a battery cell,

a) preparing a primary battery cell having a structure in which an electrode assembly including an anode, a cathode, and a separator is introduced into a battery case together with an electrolyte;

b) maintaining the electrolyte solution impregnated in the electrode assembly to perform primary aging;

c) initial charging the primary battery cell to a predetermined voltage;

(d) sequentially aging the primary battery cells in different temperature ranges to perform secondary aging and tertiary aging;

e) removing and sealing the gas in the primary battery cell;

f) clamping and baking by applying a predetermined temperature and pressure to adjust the thickness of the primary battery cell; And

g) preparing the final battery cell by regulating the primary battery cell to a set shipping voltage by charging and discharging the primary battery cell;

. ≪ / RTI >

Therefore, it is not necessary to separately display the positions of the primary battery cell in the apparatus or the tray in which the aging process and the charge / discharge process of the primary battery cell are performed, thereby saving the cost and time required for manufacturing the battery cell Since the thickness of the primary battery cell can be confirmed immediately after the clamping-bake process, it is possible to more easily set the optimized conditions for performing the clamping-bake process. In the process of removing and sealing the primary battery, It is possible to easily predict the thickness of the primary battery cell, which has been changed in accordance with the subsequent clamping-bake process, by checking only the remaining amount of the electrolyte in the primary battery cell without considering the thickness of the cell, And the gas or bubbles which can not be removed in the degassing and sealing process can be removed in the subsequent clamping-baking process In addition, in the gas removing and sealing process, it is not necessary to excessively discharge the electrolyte inside the battery cell to uniformly form the thickness of the battery cell, thereby preventing the performance deterioration of the battery cell.

In one specific example, the battery cell may be a structure having a plate-like structure in which an outer periphery is sealed by thermal fusion with the electrode assembly housed in a battery case of a laminate sheet including a resin layer and a metal layer.

That is, in the method of manufacturing a battery cell according to the present invention, the thickness of the primary battery cell may vary during the aging process and the charge / discharge process, and thus, a pouch- It can be more effectively applied to the battery cell.

On the other hand, the primary aging of the step b) may be carried out at a temperature range of 20 to 30 degrees Celsius for 40 to 80 hours.

More specifically, the primary aging process is a process of maintaining the impregnation property of the electrolyte solution in the electrode assembly in the primary battery cell to be improved. If the primary aging is performed for less than 40 hours, The electrolytic solution can not be sufficiently impregnated into the assembly. On the other hand, when the electrolytic solution is carried out for more than 80 hours, the first aging is performed for an excessively long time compared to the time required for impregnating the electrolytic solution, There is a problem that the overall time may increase.

Also, the initial charging of the process c) may be performed to a voltage range of 3.5V to 4.0V.

Generally, a lithium secondary battery is initially charged and activated during the manufacturing process. During this initial charging, lithium ions from the anode migrate to the cathode and are inserted. At this time, a solid electrolyte interface (SEI) .

Once formed, the SEI film acts as an ion tunnel to pass only lithium ions. Organic solvent molecules, such as lithium salts, EC, DMC or DEC, which have a large molecular weight and move together with lithium ions in the electrolyte solution by solvation of lithium ions by the effect of the ion tunnel, So that it is possible to prevent the structure of the cathode from collapsing. Once the SEI film is formed, lithium ions no longer undergo side reaction with the graphite anode or other material, and the amount of charge consumed in the formation of the SEI film is irreversible and does not react reversibly upon discharging. Therefore, no further decomposition of the electrolytic solution occurs, the amount of lithium ions in the electrolytic solution is reversibly maintained, and stable charging / discharging can be maintained

As a result, once the SEI film is formed, the amount of lithium ions is reversibly maintained and the lifetime characteristics of the battery are also improved.

Such an SEI film is relatively firm under the ordinary conditions of maintaining the stability of the electrolyte solution, that is, in the temperature range of -20 to 60 占 폚 and the voltage of 4 V or less, and can sufficiently prevent the side reaction between the anode and the electrolyte.

However, there is a problem that the durability of the SEI film is gradually lowered when stored at a high temperature in a fully charged state (for example, left at 85 캜 for four days after 100% charging at 4.2 V).

That is, when the high-temperature storage in the fully charged state the cathode, while the SEI film gradually collapses and exposed with the lapse of time, so that the surface of the exposed anode reacts with an electrolyte around, causing a side reaction continued to CO, CO _2, CH ₄ , C ₃ H _6, and the like are generated, resulting in an increase in the cell internal pressure.

Therefore, if this initial charge is performed at less than 3.5V, the primary battery cell can not be fully activated and the SEI film can not be formed sufficiently. On the other hand, if the initial charge is performed in excess of 4.0V , There is a problem that the durability of the SEI film may be lowered in the subsequent secondary aging and tertiary aging.

In one specific example, the secondary aging of step d) may be carried out for a period of 20 to 40 hours at a temperature in the range of 50 to 80 degrees Celsius.

If the secondary aging is carried out in an excessively low temperature range beyond the above range or if the secondary aging is performed for an excessively short time, the high temperature storage characteristics of the battery cell may be deteriorated. On the contrary, Or if it is carried out at an excessively high temperature or for an excessively long time, the durability of the SEI film may be lowered as described above.

In addition, the third aging of the step d) may be carried out at a temperature in the range of 20 to 30 degrees Celsius for 70 to 120 hours.

If the tertiary aging is carried out in an excessively low temperature range beyond the above range or if the primary battery cell is performed for an excessively short time, the primary battery cell can not be sufficiently activated, so that the electrical performance may deteriorate. On the contrary, If the third aging is carried out at an excessively high temperature outside the above range or if the aging is carried out for an excessively long time, the amount of gas generated due to the decomposition of the electrolyte increases, swelling may occur, or the durability of the SEI film There is a problem that can be deteriorated.

On the other hand, in the gas removal of the process (e), the electrolyte solution in the primary battery cell can be adjusted to a predetermined amount.

More specifically, the primary battery cell may be subjected to a clamping-baking process for adjusting the thickness of the primary battery cell after the degassing and sealing process, It is possible to easily reduce the defective thickness of the primary battery cell according to the remaining amount of the electrolytic solution in the subsequent clamping-baking process by merely adjusting the remaining amount of the electrolyte uniformly.

In addition, when the gas in the process (e) is removed, the electrolyte solution in the primary battery cell is adjusted to a predetermined amount, so that the thickness of the primary battery cell changed in the subsequent clamping-bake process can be more easily predicted, It is unnecessary to discharge the electrolyte excessively in order to uniformly control the thickness of the primary battery cell in the gas removing and sealing process, unlike the conventional method of manufacturing the battery cell. Therefore, Deterioration of performance of the battery cell can be prevented.

In one specific example, the clamping-baking of the process f) may be performed by applying a predetermined temperature and pressure, with the pair of jigs facing opposite to each other of the primary battery cells.

Therefore, not only the thickness of the primary battery cell can be more easily adjusted, but also the strength of the battery case made of the laminate sheet including the resin layer and the metal layer can be increased.

At this time, the temperature applied by the jig may be in the range 80 degrees to 25 degrees Celsius, the pressure applied by the fixture may be 300 kgf / cm ² to 2000 range kgf / cm ^2.

If the temperature or the pressure applied by the jig is too small or too low, the effect of desired thickness adjustment and the effect of increasing the strength of the battery case can not be sufficiently exhibited. On the other hand, If the temperature or pressure is too high beyond the above range, structural damage may occur to the primary battery cell.

Also, the thickness of the primary battery cell controlled by the clamping-baking in the process f) may be 75% to 95% of the thickness of the primary battery cell prepared in the process a).

If the thickness of the primary battery cell controlled by clamping-baking in the process f) is less than 75% of the thickness of the primary cell prepared in the process a) If the pressure is excessively high, structural damage may occur to the primary battery cell. On the contrary, when the size exceeds 95%, the temperature or pressure applied in the process is excessively low, And the effect of increasing the strength of the battery case can not be sufficiently exhibited.

If the thickness of the primary battery cell has a size smaller than 75% or larger than 95%, even though the clamping-bake process is performed in a range of normal temperature and pressure, , It is possible to expect an abnormality of the primary battery cell itself.

Meanwhile, the g) process may be performed by performing a full discharge and a full charge of the primary battery cell, and then discharging to reach a set shipping voltage.

More specifically, the primary battery cell is spontaneously discharged during the course of the secondary aging and the tertiary aging after the initial charging. In this process, the voltages of the primary battery cells may be individually differentiated, The primary battery cells may be regulated and classified to have different voltages according to the respective devices to be applied.

Therefore, in the step g), the primary battery cell is discharged so as to reach the set discharge voltage in the fully discharged state and the fully charged state, so that not only the same voltage state can be maintained, By discharging and sorting the battery cells, different types of final battery cells can be separately prepared.

Also, the shipment voltage of the process g) may be set in a range of 80% to 90% with respect to the full charge voltage of the primary battery cell.

If the shipment voltage of the process g) is set to less than 80% of the full charge voltage of the primary battery cell, the discharge cell can not be immediately used due to natural discharge in the waiting process until the final battery cell is used, On the contrary, when the final battery cell is used in excess of 90%, the battery is in an excessively high voltage state until the final battery cell is used. Therefore, problems such as leakage of electrolyte may occur, The final battery cell can not be fully reactivated by recharging, and performance may be degraded.

In one specific example, the battery cell manufacturing method includes:

i) a primary inspection process for checking whether the electrolyte cell is impregnated in the electrolyte cell, whether a side reaction has occurred or not, and whether the cell has undergone an agglomeration abnormality after the first aging in the step b);

ii) a secondary inspection step of inspecting a charging capacity of the primary battery cell after the initial charging of the step c);

iii) a third inspection step of inspecting the discharge capacity of the primary battery cell after the third aging in the step d);

iv) a fourth checking step of checking a voltage regulation state of the primary battery cell after the shipment voltage adjustment in the step g);

As shown in FIG.

Accordingly, the primary battery cell is checked for an abnormality according to each process, so that it is possible to more easily identify the problem of the specific process or device in which the abnormality occurs, Time, and cost for identifying a specific process or device to be generated.

Here, in the fourth inspection process, the final battery cells may be prepared by separately classifying each of the primary battery cells according to different types of shipping voltages.

Also, the battery cell manufacturing method may include: checking the remaining amount of the electrolyte in the primary battery cell after gas removal and sealing in process (e); or f) after clamping-baking the process, Of course.

According to another aspect of the present invention, there is provided an apparatus for manufacturing a battery cell by the battery cell manufacturing method,

An activator for charging / discharging the primary battery cell;

A gas removing unit for removing and sealing the gas in the primary battery cell; And

A clamping-baking unit for clamping and baking by applying a predetermined temperature and pressure so as to adjust the thickness of the primary battery cell from which the gas is removed;

. ≪ / RTI >

Therefore, the primary aging, the initial charging, the secondary aging and the tertiary aging for the primary battery cell can be continuously performed in the same activated portion without moving the apparatus or the tray, It is unnecessary to separately display the positions of the apparatus or the tray in which the aging process and the charging / discharging process of the primary battery cell are performed. Therefore, Time can be saved.

The present invention also provides a battery cell manufactured by the method for manufacturing a battery cell and a device including the battery cell, wherein the device is used for a mobile phone, a tablet computer, a notebook computer, a power tool, a wearable electronic device, A hybrid electric vehicle, a plug-in hybrid electric vehicle, and a power storage device.

Other configurations of the above devices or devices are well known in the art, so a detailed description thereof will be omitted herein.

As described above, in the method of manufacturing a battery cell according to the present invention, the process of clamping and baking the primary battery cell is performed after the gas removing and sealing process, It is possible to reduce the cost and time required for manufacturing the battery cell, and it is possible to confirm the thickness of the primary battery cell immediately after the clamping-baking process It is possible to more easily set the optimized conditions for performing the clamping-baking process, and it is possible to reduce the residual amount of the electrolytic solution in the primary battery cell without considering the thickness of the primary battery cell in the gas removal and sealing process It is possible to easily predict the thickness of the changed primary battery cell according to the subsequent clamping-baking process, The gas or bubbles which can not be removed in the degassing and sealing process can be removed in the subsequent clamping-baking process, and in the gas removing and sealing process, There is no need to excessively flow out the electrolytic solution inside the battery cell, so that it is possible to prevent the deterioration of the performance of the battery cell.

1 is an exploded perspective view schematically showing a structure of a conventional pouch-shaped battery cell;
2 is a graph schematically showing a change in voltage level according to each process of a conventional battery cell manufacturing method;
3 is a graph schematically illustrating a change in voltage level according to each process of the method for manufacturing a battery cell according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings according to the embodiments of the present invention, but the scope of the present invention is not limited thereto.

FIG. 3 is a graph illustrating a change in a voltage level according to each process of the method for manufacturing a battery cell according to an embodiment of the present invention.

Referring to FIG. 3, a primary battery cell having a structure in which an electrode assembly including an anode, a cathode, and a separation membrane is introduced into a battery case together with an electrolyte solution is first aged 201 by maintaining an electrolyte solution impregnated in the electrode assembly.

The primary aging (201) is carried out at a temperature range of about 23 degrees Celsius for 40 hours.

The primary cell 201 having undergone the primary aging 201 is subjected to a primary inspection process 211 for inspecting whether the electrolyte cell is impregnated with an electrolyte solution, a side reaction has occurred, and an assembled state is present or absent.

Thereafter, the primary battery cell is activated by initial charging 202 at a voltage of about 3.7 V, whereby an SEI film is formed on the cathode surface, which serves as an ion tunnel.

The primary battery cell in which the initial charge 202 has been completed is subjected to a secondary inspection process 212 for inspecting the charging capacity.

Thereafter, the primary battery cell is maintained in a temperature range of about 60 degrees Celsius for about one day (24 hours) to undergo secondary aging (203). After the secondary aging, the temperature of the primary battery cell is about 23 degrees Celsius And maintained for about 4 days (96 hours) and then aged three times (204).

Therefore, the primary aging 201, the initial charging 202 and the secondary aging 203 and the tertiary aging 204 for the primary battery cell are continuously performed in the same activating unit without moving the apparatus or the tray (201, 203, 204) and the initial charge (202) of the primary battery cell can be accurately identified because it is possible to accurately identify at which position the failure of the primary battery cell occurs, It is not necessary to separately display each position in the tray, thereby saving the cost and time required for the operation.

The primary battery cell having undergone the tertiary aging (204) is subjected to a tertiary inspection process (213) for inspecting the discharge capacity.

Thereafter, the primary battery cell is degassed and sealed (205), whereby the internal electrolyte is regulated to a predetermined amount in a desired range.

The primary battery cell in which the degassing and sealing 205 has been completed can be adjusted in thickness by applying a predetermined temperature and pressure in a state in which a pair of jigs face each other on opposite sides of the primary battery cell, And then baking (step 206). Thus, the thicknesses of the primary battery cells can be adjusted to be thin and uniform.

Thereafter, after the primary battery cell performs full discharging and full charging, the primary battery cell is discharged to reach the set shipping voltage, thereby being adjusted (207) to the set shipping voltage.

The final battery cell is prepared through the fourth inspection process 214 for checking the voltage regulation state of the primary battery cell after the shipping voltage regulation 207 is completed.

Accordingly, not only the primary battery cells can maintain the same voltage state, but also different battery cells of different kinds can be separately prepared by discharging and sorting the primary battery cells in a desired voltage range.

The method of manufacturing a battery cell according to the present invention may include the step of inspecting the remaining amount of the electrolyte in the primary battery cell after the degassing and sealing of the process e) or after the clamping-baking of the process f) And a step 216 of checking the thickness of the cell.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (18)

a) preparing a primary battery cell having a structure in which an electrode assembly including an anode, a cathode, and a separator is introduced into a battery case together with an electrolyte;
b) maintaining the electrolyte solution impregnated in the electrode assembly to perform primary aging;
c) initial charging the primary battery cell to a predetermined voltage;
(d) sequentially aging the primary battery cells in different temperature ranges to perform secondary aging and tertiary aging;
e) removing and sealing the gas in the primary battery cell;
f) clamping and baking by applying a predetermined temperature and pressure to adjust the thickness of the primary battery cell; And
g) preparing the final battery cell by regulating the primary battery cell to a set shipping voltage by charging and discharging the primary battery cell;
And forming a battery cell. The battery cell according to claim 1, wherein the battery cell has a plate-like structure in which an outer periphery is sealed by thermal fusion in a state that an electrode assembly is housed in a battery case of a laminate sheet including a resin layer and a metal layer ≪ / RTI > The method according to claim 1, wherein the first aging in step b) is performed at a temperature in the range of 20 to 30 degrees Celsius for 40 to 80 hours. The method of claim 1, wherein the initial charging of step c) is performed to a voltage range of 3.5V to 4.0V. The method of claim 1, wherein the secondary aging of step d) is performed at a temperature in the range of 50 to 80 degrees Celsius for 20 to 40 hours. The method of claim 1, wherein the third aging in step d) is performed at a temperature in the range of 20 to 30 degrees Celsius for about 70 to 120 hours. The method according to claim 1, wherein, in the gas removal step (e), the electrolyte solution in the primary battery cell is adjusted to a predetermined amount. The method according to claim 1, wherein the clamping-baking in the step f) is performed by applying a predetermined temperature and pressure while a pair of jigs face each other on opposite sides of the primary battery cell. ≪ / RTI > The method of claim 8, wherein the temperature applied by the jig is in the range of 25 to 80 degrees Celsius. The method according to claim 8, wherein the pressure applied by the jig is in the range of 300 kgf / cm ² to 2000 kgf / cm ² . The method according to claim 1, wherein the thickness of the primary battery cell controlled by clamping-baking in step f) is in the range of 75% to 95% of the thickness of the primary battery cell prepared in step a) A method of manufacturing a battery cell. The method as claimed in claim 1, wherein step g) is performed by discharging the battery to reach a set discharge voltage after performing full discharge and full charge of the primary battery cell. The method of claim 1, wherein the shipment voltage of step g) is set in a range of 80% to 90% with respect to a full charge voltage of the primary battery cell. The battery cell manufacturing method according to claim 1,
i) a primary inspection process for checking whether the electrolyte cell is impregnated in the electrolyte cell, whether a side reaction has occurred or not, and whether the cell has undergone an agglomeration abnormality after the first aging in the step b);
ii) a secondary inspection step of inspecting a charging capacity of the primary battery cell after the initial charging of the step c);
iii) a third inspection step of inspecting the discharge capacity of the primary battery cell after the third aging in the step d);
iv) a fourth checking step of checking a voltage regulation state of the primary battery cell after the shipment voltage adjustment in the step g);
Further comprising the steps of: An apparatus for manufacturing a battery cell by the method for manufacturing a battery cell according to claim 1,
An activator for charging / discharging the primary battery cell;
A gas removing unit for removing and sealing the gas in the primary battery cell; And
A clamping-baking unit for clamping and baking by applying a predetermined temperature and pressure so as to adjust the thickness of the primary battery cell from which the gas is removed;
Wherein the battery cell manufacturing apparatus comprises: A battery cell manufactured by the method for manufacturing a battery cell according to claim 1. A device comprising a battery cell according to claim 16. 18. The device of claim 17, wherein the device is selected from the group consisting of a cell phone, a tablet computer, a notebook computer, a power tool, a wearable electronic device, an electric vehicle, a hybrid electric vehicle, a plug- . ≪ / RTI >

Images