1]This application claims the benefit of priority based on the October 31, 2017 Korea Patent Application No. 2017-0143675 years, and all information disclosed in the literature of the Korea patent application are included as part of the specification.
[2]The present invention is injected as a secondary battery including the molded battery case, and is delivered is specifically, an electrode assembly accommodated in the battery case with the material, the battery case is room for storage of the electrode assembly formed in the injection molding It relates to a secondary battery made of a thermoplastic resin.
BACKGROUND
[3]
The lithium secondary battery is used as an energy source for various devices. Lithium secondary batteries are widely used from small mobile devices such as smart phones to large devices such as an electric vehicle. Lithium secondary batteries are classified into cylindrical batteries, prismatic batteries, and pouch-shaped battery case in accordance with the form. A cylindrical battery and a prismatic battery is a battery equipped with an electrode assembly in a metal can, a pouch-shaped battery is a battery equipped with an electrode assembly in a pouch type case of aluminum laminate sheet. Among them is attracting a lot of attention and can be stacked with high integration density is high in energy density per weight is low and the pouch-shaped battery deformation, easy price.
[4]
Pouch-shaped battery is housed an electrode assembly by molding the aluminum laminate sheet. By increasing the cell capacity is increased the thickness of the electrode assembly. If the space to place the battery eventually it runs out is not only possible to reduce the thickness of the battery case. The thickness of the aluminum laminate sheet The more thin and inferior in formability. Because of this is to manufacture a deep depth of the receiving electrode assembly also becomes difficult.
[5]
On the other hand, an aluminum laminate sheet has a weak to external impact, fixing is difficult to form a constant problem because of its low rigidity compared to metal can type battery case.
[6]
In this connection, the Republic of Korea Patent Application No. 1,089,168 discloses a respective wrapping the electrode assembly in a unit cell type, and each of the packing to the inside resin layer and be formed in a two-layer structure of the outer resin layer topography first package, and said first package It discloses a pouch type lithium secondary battery including a metal-type second packing material for storing and packaging at the same time the two or more unit cells to form the module.
[7]
The Republic of Korea Patent Application No. 1089168 arc pouch type lithium secondary battery is using RESIN packaging material consisting of the inner resin layer and the outer resin layer of the layered structure. When using a laminate sheet containing aluminum as a battery case of a typical pouch-type secondary battery is an aluminum layer is exposed, but can prevent the insulating property decreases, a weak ability to block the influx of foreign matter such as moisture penetration, a plurality because of the need to process to combine the different layer made of the layer structure has a problem that there is inconvenience in the process.
[8]
In addition, the Republic of Korea Patent Application No. 1,084,801 discloses a process for producing a rechargeable battery equipped with a battery core pack in the forming die, and injecting a molten resin in an injection molding apparatus. However, the Republic of Korea Patent core pack heading No. 1,084,801 is a bar, the Republic of Korea Patent Application No. 1,084,801 favor secondary battery made of a structure comprising a circuit module connected to the pouch type bare cell and the bare cell is a pouch of the electrode assembly in a structure of that type received in a battery case for a battery case, a problem of moldability improvement occurred in the previous does not provide a solution.
[9]
Republic of Korea Patent Application No. 0,889,203 discloses a resin-molded secondary being formed with the bare cell and the protection circuit are both covered with the resin mold in the safety device is engaged state including a protection circuit for the bare cell including a pouch that is a built-in electrode assembly It discloses a battery. However, the Republic of Korea Patent Application No. 0,889,203 favor secondary battery may also fail to solve the conventional problems in that the electrode assembly is coated with an outer surface of the bare cell in the stored state in the conventional pouch-shaped battery case made of a resin mold.
[10]
Thus, being able to overcome the poor formability of a thin pouch-shaped battery case technology to provide a secondary battery including a battery case to accommodate the electrode assembly having a relatively large thickness as has not yet been presented to.
Detailed Description of the Invention
SUMMARY
[11]
The present invention for solving the problems of the prior art, deliver the electrode assembly and is accommodated in a battery case together with the substance, and an object thereof is to provide a battery case, a space for accommodating the electrode assembly, which is formed. Specifically, the battery case to be capable of solving the problem of poor moldability, while case accommodating the electrode assembly is thickened in order to increase the capacity and provides a method for manufacturing the same.
Problem solving means
[12]
A secondary battery according to the present invention for achieving this purpose,
[13]
A secondary cell having a structure accommodated in a battery case together with an electrolyte electrode assembly substance,
[14]
The battery case is formed a space for accommodating the electrode assembly,
[15]
The battery case may be a structure formed of a thermoplastic resin is injection moldable.
[16]
When using a laminate sheet including a metal layer, such as a conventional aluminum pouch-shaped battery case, the laminated sheet is weak in protecting an electrode assembly from external shock lower, rigid as compared to the can type battery case made of metal material, and constant the fixed form there is a difficult problem.
[17]
In addition, the increase in the thickness of the electrode assembly, as the demand for a high-output high-capacity rechargeable battery is increased, the depth of the can for receiving the electrode assembly in order to accommodate the thickened electrode assembly housing also deepening trend.
[18]
On the other hand, without increasing the thickness of the secondary battery standing for the production of high-capacity secondary battery, the thickness of the electrode assembly is increased and if the thickness of the battery case is thinning becomes the thickness of the bar, the battery case thin and that has a storage depth the deep molding it becomes more difficult to.
[19]
Thus, in the case of using the laminate sheet as a battery case, the safety and formability by low rigidity is a problem for the production of a conventional pouch type secondary battery.
[20]
However, in the case of using a battery case formed of a thermoplastic resin is injection-molded as possible as in the present invention, by injecting a thermoplastic resin into a mold for injection molding of a size corresponding to the thickness of the electrode assembly is a bar that can be made to the battery case , it can be easily produced a deep cell case accommodating the electrode assembly unit formed thereon.
[21]
Further, the productivity of the bar, the secondary battery manufacturing process is the simplification of the secondary battery can be improved because it is not necessary sealing step of the battery case using a molding process and a pressure member for forming an accommodation space of the electrode assembly.
[22]
In one specific example, the battery case is a bar, the upper case and after respectively forming the lower case electrode assembly and the electrolyte storage material, and the upper case and the lower case can be composed of the upper case and the lower case seals.
[23]
For example, the battery case is a bar, the upper case and the lower case made of thermoplastic resin may be sealed by heat-sealing, ultrasonic welding, laser welding.
[24]
That is, it is the upper case and the lower case can be made in the sealing portion by the thermal welding, ultrasonic welding, laser welding, which face each other.
[25]
In another specific example, the battery case is when injecting the thermoplastic resin in a housing the electrode assembly in a mold for injection molding the bar which may be made as a one-piece structure by injection molding conditions, wherein the outer surface of the entire of the electrode assembly bar with a thermoplastic resin to prepare a battery case of the structure is surrounded, on the other battery case of such a structure may be formed as a one-piece structure in which the joint portion of the battery case is formed in appearance. Thus, the process of coupling the upper case and the lower case are separated from one another as described above is not necessary.
[26]
A secondary battery according to the present invention, it is necessary to complement the role of the moisture barrier having a metal layer of a laminate sheet including a bar, a conventional metal layer made of a thermoplastic resin is injection moldable. Accordingly, the battery case of the present invention may be formed of a thermoplastic resin containing an additive of moisture in order to prevent the performance of the secondary battery decreases due to moisture coming from outside.
[27]
Alternatively, the secondary battery according to the present invention may be made of a structure at least a part of a surface of the electrode assembly, the aluminum tape is wrapped to protect the electrode assembly from the entry of foreign matter, including water, for example, electrodes in the electrode assembly and the terminal may be composed of the outer surface of other than the outer surface of a projecting direction side of the aluminum tape is part structure, the entire outer surface of the aluminum tape portion of the electrode assembly to obtain the barrier effect of the moisture in the entire portion of the electrode assembly It may be made to the structure.
[28]
The battery case has an upper case and a case made of a separate structure consisting of a lower case, after forming of the battery case through a process for receiving and sealing the electrode assembly and the electrolytic material, and producing the secondary battery, the electrolyte material is the cell case may be possible in liquid form is injected into the interior.
[29]
On the other hand, the battery case is when made as a one-piece structure by injection molding, the electrode assembly the bar that is to form the battery case of the structure that wraps around the outer surface of all of the electrode assembly in a stored state in the forming die, delivery of the liquid injection of the substance this can not be done. Thus, the electrolytes of such a case is the delivery made of a solid material constitutes an electrode assembly.
[30]
Wherein the thermoplastic resin is one kinds or more selected from polyvinyl alcohol, polyethylene, polypropylene, polystyrene, acrylonitrile butadiene styrene copolymer (ABS), polyamide, polyvinyl chloride, acrylic, fluoropolymer, and the group consisting of polyethylene terephthalate can.
[31]
The invention also provides a method of manufacturing the secondary battery.
[32]
A secondary battery manufacturing process according to one embodiment,
[33]
(A) preparing a forming die for manufacturing a battery case having a receiving space of the electrode assembly;
[34]
(B) the step of forming each of the upper case and the lower case by injecting a thermoplastic resin into the forming mold;
[35]
(C) the step of storing the electrode assembly in the upper case and the lower case separated from the mold, and injecting a substance delivered after coupling the battery case; And
[36]
(D) the step of sealing by fusing the binding portion of the battery case;
[37]
It may consist of a process that includes.
[38]
Such a secondary battery manufacturing method as the case of using a removable battery case is divided into an upper case and a lower case, after the injection housing the electrode assembly in a molding cell can, and electrolyte injected into the material, the upper case and the lower case with each other It made from a combination of face-to-face part.
[39]
A secondary battery manufacturing process according to another embodiment,
[40]
(A) preparing a forming die for producing a battery case having a space for accommodating the electrode assembly;
[41]
(B) step of storing the electrode assembly in the mold;
[42]
(C) a step of producing a battery case having an electrode assembly in the electrode assembly inside the injection mold for molding a thermoplastic resin in a storage; And
[43]
(D) separating the battery cases from the mold;
[44]
It may consist of a process that includes.
[45]
In a case of a secondary battery manufacturing method of manufacturing a battery case of one-piece structure, prior to forming the battery case, by injecting a thermoplastic resin in a housing the electrode assembly in the mold for molding state of the battery case to the outer surface of the entire of the electrode assembly It comprises a process in which a battery case is formed.
[46]
In this case, there is another advantage of the process is unnecessary for the coupling of the upper case and the lower case as in the production method of the above.
[47]
The thermoplastic resin used in the production method of the can to absorb the water generated inside the bar may further include an additive of the hygroscopicity, the cell to prevent the performance of the electrode assembly to be lowered.
[48]
In addition, the electrode assembly as compared to the case where an aluminum tape is used for a laminate sheet, which wraps around at least a portion of the surface of a metal layer on the bar, the prior can be made of a structure in the battery case, the outer material used in the above production method of the barrier it can solve the problem of degradation.
[49]
The thermoplastic resins include polyvinyl alcohol, polyethylene, polypropylene, polystyrene, acrylonitrile butadiene styrene copolymer (ABS), polyamide, polyvinyl chloride, acrylic, fluorocarbon resin and polyethylene terephthalate, at least one element selected from the group consisting of as it can be achieved.
[50]
In the method of manufacturing the battery case of the integral structure, after storing the electrode assembly in the molding die of the battery case, by injecting the thermoplastic resin into the mold for molding the electrode assembly is accommodated, a battery having an electrode assembly within the the secondary battery manufacturing bars, this way of manufacturing the casing may be a full-solid electrolyte cell using a solid electrolyte in the form of a material.
[51]
Thus, the electrode assembly may be a type that does not use a separate separator, producing a secondary battery comprising a solid electrolyte structure interposed between the positive and negative electrodes.
[52]
The present invention also provides a device including a battery pack as a power source and the battery pack including two or more secondary cells as the unit cells.
[53]
The battery pack is high temperature stability and can be used in the long cycle characteristics and power of the device is required such as high rate characteristics, a detailed example of such a device, a mobile electronic device (mobile device), wearable electronic devices (wearable device), omniscient power tool moving receiving power by a motor (power tool); Electric vehicles, including hybrid electric vehicles (Plug-in Hybrid Electric Vehicle, PHEV) including - an electric vehicle (Electric Vehicle, EV), hybrid electric vehicles (Hybrid Electric Vehicle, HEV), plug; Electric bicycles (E-bike), electric two-wheeled vehicle including an electric scooter (E-scooter); Electric golf carts (electric golf cart); And the like electric power storage device (Energy Storage System), but it is not limited to this.
[54]
Structure and its manufacturing method of the devices are so well known in the art, in the present specification a detailed description thereof will be omitted.
Brief Description of the Drawings
[55]
1 is an exploded perspective view of a secondary battery according to one embodiment.
[56]
Figure 2 is an exploded perspective view of the battery case in accordance with one embodiment.
[57]
Figure 3 is a perspective view of an electrode assembly in accordance with multiple embodiments.
[58]
Figure 4 is a perspective view of a secondary battery according to another embodiment.
[59]
5 is a perspective view of a secondary battery for making the forming die of Fig.
[60]
6 is a perspective view of a secondary battery for making the forming die of Fig.
Mode for the Invention
[61]
Reference to the accompanying drawings self having ordinary skill in the art will be described in detail an embodiment that can easily practice the invention. However, if it is determined that in the following description of the detail of the operation principle of a preferred embodiment of the present invention is a detailed description of known functions or constructions may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.
[62]
In addition, the same reference numerals to portions that a similar function and operation throughout the drawings. In the specification, when there is any part connected to the other part, which, as well as if it is directly connected to, placed between the other elements in between, and includes cases that are indirectly connected. Also, it includes a certain component, not excluding the other elements do not have a base material which is particularly opposite, means that may further contain other components.
[63]
According to the invention in the drawings will be described as in the detailed embodiment.
[64]
1 is an exploded perspective view of a secondary battery according to one embodiment.
[65]
1, a secondary battery 100 includes a cell case made of a thermoplastic resin is injection moldable, the cell case is composed of an upper case 110 and lower case 120. The upper case 110 and is formed to for acceptance housing 111 of the electrode assembly 130, the lower case 120 is formed with a can for accommodating housing 121 of the electrode assembly 130. The sum of the height (D3) of the height (D2) and the housing 121 of the electrode assembly 130 includes a bar which is located in housing portions 111 and 121 together with the electrolytic material, the housing 111 is an electrode assembly (130 ) it is formed of larger or equal to the thickness (D1).
[66]
The housing of the upper case 110 and lower case 120, the housing outer periphery 112 and the lower case 120 of the upper case 110 in a state of accommodating the electrode assembly 130 inside the outer periphery 122 bar is positioned facing each other, the outer periphery (112, 122) will be written is sealed by heat, ultrasonic or laser welding.
[67]
Figure 2 shows an exploded perspective view of a battery case according to one embodiment.
[68]
2, the battery case 200 is a separate type battery case consisting of an upper case 210 and lower case 220, such as a battery case of Figure 1, the battery case 200 is of a thermoplastic resin is injection moldable is done, the thermoplastic resin may contain the additives of hygroscopicity.
[69]
3 shows a perspective view of an electrode assembly of the three in Fig.
[70]
3, the electrode assembly (230, 240, 250) is of a structure wound in a membrane intervening in a long sheet-like positive and negative state jelly-roll (winding type) electrode assembly, taken in units of a predetermined size, a plurality of bi-cells (bi-cell) stacked in a state sandwiching the anode and the cathode of the stack sequentially stacked in a state of sandwiching the membrane-type (stack-type) electrode assembly, a separator of the positive electrode and the negative electrode of a predetermined unit, pull cells ( Full cell) may be a stack structure of a separator sheet take-up / folding type electrode assembly or the bi-cell, pull cells are stacked with a separator is interposed state lamination / stack of the bonded structure type electrode assembly.
[71]
In addition, the electrode assembly (230, 240, 250) may be made of a solid electrolyte is interposed between the bar structure, the positive and negative electrodes, which may be an electrode assembly constituting the all-solid battery.
[72]
Electrode assembly (230, 240, 250), but is shown as a protruding structure to each other in the other direction, the electrode terminals (231, 241, 251), comprises an electrode terminal protruding to a side structure.
[73]
Electrode assembly (230, 240, 250) to at least a portion of the outer surface of the aluminum tape may be added to the bar, the electrode assembly 230 in order to enhance the barrier property for water is formed in a linear pattern from, the aluminum tape 235 that is attached, the electrode assembly 240 may be an aluminum tape 245 is added to surround the whole side surface other than the surface of the electrode terminal 241 protrudes, the electrode assembly 250 is a surface with an electrode terminal is projected the entire outer surface of the electrode assembly may include an aluminum tape 255 is attached.
[74]
Figure 4 is a perspective view of a secondary battery according to another embodiment.
[75]
4, the secondary battery 300 may be the inside of the battery case 310. The electrode assembly 330 is accommodated, the outside of the battery case may protrude only the electrode terminal 331, a battery case (310 ) of the outer surface is made of a one-piece structure with no seams.
[76]
The electrode assembly 330 includes a secondary battery 300 includes a solid electrolyte made of a structure interposed between the positive electrode and the negative electrode, all the components of the bar, the secondary battery does not use a liquid electrolyte additionally to former consisting of a solid It corresponds to the solid-state battery.
[77]
The secondary battery 300 as is manufactured by injecting a thermoplastic resin in a state in which the position of the electrode assembly to a mold for forming the battery case.
[78]
5 is a perspective view of a secondary battery for making the forming die of a separate structure as shown in Fig.
[79]
5, the forming die 400 has a recess 442 corresponding to the size and shape of the upper case or the lower case is formed, the injection port 441 for injection of the thermoplastic resin is one formed a plurality .
[80]
Housing the electrode assembly in a battery case produced by using a forming mold 400, and sealing the battery case by heat-sealing the facing surface of the upper case and the lower case after coupling the upper case and an electrolyte injection and lower cases.
[81]
6 is a perspective view of the forming die for producing the secondary battery of the integrated structure as shown in FIG.
[82]
Referring to Figure 6, the forming die 500 is an upper forming die 510 and the lower portion consists of a forming mold 520, the upper forming die 510 and the bottom forming die (520) inside of the electrode assembly 530, the space for receiving are formed. Coupling a mold (510, 520) in a housing the electrode assembly 530 in the state space to inject the thermoplastic resin with the thermoplastic resin injection port 521.
[83]
Thermoplastic resins to form a battery case of one-piece structure surrounding the entire outer surface of the electrode assembly 530.
[84]
The outer surface of the electrode assembly 530 has may be a non-addition of any form of treatment, or, may be an aluminum tape on at least a portion of the outer surface structure portion. Further, the thermoplastic resin may be used as any of the additives may be in the non-addition forms, or absorption of the additive addition forms.
[85]
Those of ordinary skill in the art that the present invention it will be possible to perform a variety of applications and modifications within the scope of the invention as disclosed in the accompanying claims.
Industrial Applicability
[86]
As described above, the secondary battery according to the present invention, including a battery case made of a thermoplastic resin is injection moldable, and wherein the battery case has a bar that has a space for accommodating the electrode assembly and an electrolyte material is formed, high-capacity high- even increasing the thickness of the electrode assembly to manufacture a secondary battery of the energy density, it is possible to accommodate the thickness of the electrode assembly by controlling the size of a mold for injection molding.
[87]
Further, by the manufacturing process is simplified to improve the productivity we are not required heat fusion process using the molding process, and the pressing member of another battery case.
[88]
Further, by the thermoplastic resin constituting the battery case containing the additives of the hygroscopic or apply the aluminum tape to the outer surface of the electrode assembly, it is possible to supplement the barrier properties of the outer material.

Claims

[Claim 1]A secondary cell having a structure accommodated in a battery case together with an electrolyte electrode assembly substance, the battery case is formed a space for accommodating the electrode assembly and the cell case is a rechargeable battery which is made of thermoplastic resin is injection moldable.
[Claim 2]
The method of claim 1, wherein the battery case has a secondary battery constituted by the upper case and the lower case.
[Claim 3]
3. The method of claim 2, wherein the upper case and the lower case is a secondary battery which is sealed by heat or ultrasonic welding.
[Claim 4]
The method of claim 1, wherein the battery case has a secondary battery comprising a one-piece structure by injection molding.
[Claim 5]
The method of claim 1, wherein the battery case has a secondary battery made of a thermoplastic resin containing the additives of the hygroscopicity.
[Claim 6]
The method of claim 1, wherein the electrode assembly is a secondary battery made of a structure of aluminum tape is wrapped at least a portion of the surface.
[Claim 7]
The method of claim 1 wherein the electrolytic material is a secondary battery which is a liquid or solid form.
[Claim 8]
The method of claim 1, wherein the thermoplastic resin is the group consisting of polyvinyl alcohol, polyethylene, polypropylene, polystyrene, acrylonitrile butadiene styrene copolymer (ABS), polyamide, polyvinyl chloride, acrylic, fluorocarbon resin and polyethylene terephthalate at least one member selected from the battery case.
[Claim 9]
(A) preparing a forming die for manufacturing a battery case having a receiving space of the electrode assembly; (B) the step of forming each of the upper case and the lower case by injecting a thermoplastic resin into the forming mold; (C) the step of storing the electrode assembly in the upper case and the lower case separated from the mold, and injecting a substance delivered after coupling the battery case; And (d) sealing by fusing the binding portion of the battery case; Method of producing a secondary battery comprising a.
[Claim 10]
(A) preparing a forming die for producing a battery case having a space for accommodating the electrode assembly; (B) step of storing the electrode assembly in the mold; (C) a step of producing a battery case having an electrode assembly in the electrode assembly inside the injection mold for molding a thermoplastic resin in a storage; And (d) separating the battery cases from the mold; Method of producing a secondary battery comprising a.
[Claim 11]
In the ninth or claim 10, wherein the thermoplastic resin The method of manufacturing a secondary battery further comprises an additive in moisture absorption.
[Claim 12]
In the ninth or claim 10, wherein the electrode assembly manufacturing method comprising the secondary battery in a structure of aluminum tape is wrapped at least a portion of the surface.
[Claim 13]
Ninth according to any one of claims 10, wherein the thermoplastic resin is one member selected from the group consisting of polyvinyl alcohol, polyethylene, polypropylene, polystyrene, acrylonitrile butadiene styrene copolymer (ABS), polyamide and polyethylene terephthalate production process or more secondary cells.
[Claim 14]
11. The method of claim 10, wherein the electrode assembly is a secondary battery manufacturing method consisting of the solid electrolyte interposed between the positive electrode and the negative electrode structure.