[1]The present invention is heat-expandable to tape the safety is improved battery cells containing and more detail relates to a production method thereof, the present invention provides in a battery pack including multiple battery cells, heat generated in the charging and discharging process, because of this, and that the thermal expansion by applying an internal gas generating tape comprises a heat-expandable tape, characterized in that for effectively discharged to the outside of the battery cell safety is improved battery cell and a process for their preparation.
BACKGROUND
[2]
In general, the kind of the secondary batteries include nickel-cadmium batteries, nickel hydrogen batteries, lithium ion batteries and lithium ion polymer batteries. Such secondary batteries digital camera, P-DVD, MP3P, cell phone, PDA, Portable Game Device, Power Tool and not only small items such as Ebike, electric or hybrid cars and large products and surplus that high power is required, such as generated power or is used is applied to the electric power storage device and the backup energy storage device for storing renewable energy.
[3]
On the other hand, the large batteries used in electric vehicles or hybrid electric vehicles or power storage device comprises a plurality of unit cells assembly connected in series and / or in parallel. Batteries are a number of unit cells are connected, is the problem of controlling the state of each unit cell and the battery pack according to the charging and discharging in the form of a battery pack repeated occurrence.
[4]
Depending on the shape of the lithium secondary battery is classified into a cylindrical shape (cylinder type), rectangular (prismatic type) and a pouch type (pouched type) and the like. In particular, the pouch type secondary battery is made of the case with the flexibility in shape ropda relatively free. In addition, the manufacturing process is relatively easy, and is widely used in the rechargeable battery industry and the manufacturing cost is low.
[5]
However, the pouch-shaped secondary battery is made to be an organic solvent and a plasticizer is added to improve the output or capacity characteristics. And a pouch type secondary battery is lead to charge and discharge process, overcharging occurs or the internal short circuit occurs or the like swelling (swelling) development internal temperature rise of, and a pouch into which flammable gas is generated from bulging cells in an instant by due to the failure in can. In order to prevent this swelling phenomenon by adequately must move or release the gas inside the pouch case. In particular, being the study to achieve the above problems, without additional components for gas discharge of the components of the conventional battery pack is in progress.
[6]
In Korea Laid-Open Patent Application No. 2016-0095439 (11.08.2016) at regular intervals are respectively arranged in horizontal and vertical directions, and having an electrode terminal and safety vent, respectively, on which the electrode terminal and the safety vent arranged toward the one side a secondary battery unit including a plurality of secondary batteries; Pressure plate for urging the secondary cell unit surrounding the exterior of the secondary battery unit to form a band at a predetermined pressure; And covering the electrode terminal and the safety vent, and are respectively connected to the safety vent is formed with a duct for guiding so that the gas that is respectively discharged moved to the first position from the safety vent, connected to the duct at the first location in that it comprises an insulation cover comprising a coupling member to the vent hole it is disclosed a battery module according to claim.
[7]
Japanese Patent Laid-Open Publication No. 2011-071097 (07.04.2011) in the cell terminal is installed a top surface, a bottom surface and a plurality of battery cells and each cell having a side surface connecting the bottom surface and the top surface respectively opposite to the upper surface At the same time, each of the cell terminals of the battery cells soon as the terminals lined up in a straight line and respectively support the each of the upper surface and the adhesion of the cells take part first recess for the battery cells in the array a plurality so as to be positioned on the same plane exposure opening is formed in each of the first support frame and a plurality of second support frame and a plurality of the battery cells get a second recess for supporting the battery cells each in which each said bottom surface and the adhesion of the cells to the a bus for connecting the third support frame and each of the cell terminal of said one cell, said cell exposed at the opening of the first support frame having a tubular portion for supporting the side of the electrical Described at the same time enclosing a plurality of electric third support framework standing on the bottom and the bottom one to the second counter and the second support frame supporting the battery cell having an outside case having a side wall that is fastened to the first support frame there is a secondary battery is disclosed that the device according to claim.
[8]
Japanese Patent Publication No. 5993209 (26.08.2016) in the battery pack configured Jiro plurality of unit cells accommodated in the container case and has an air outlet is installed to discharge the cooling air intake port and to introduce cooling air to the cooling case by the wind as the battery cooling structure for cooling the battery pack, unit cells the lithium ion secondary battery or a nickel hydrogen secondary battery, and an air inlet or air outlet, the refractory closure member (3) which expands to close the air inlet or air outlet by the heat at the time of fire, there is arranged a refractory closure member expansion starting temperature is composed of a heat-expandable fire-resistant resin material containing the expansion material of 270 or less also at the same time as, the duct member is connected to an air inlet or air outlet, refractory closure member is a circumferential surface of the air inlet or air outlet has a cylindrical portion which is disposed to follow, wherein the tubular portion of the refractory closure member It discloses a cell structure interposed between the apparatus or air outlet and a duct member.
[9]
In Korea Laid-Open Patent Application No. 2013-0117637 (28.10.2013), the electrode assembly including an electrode tab; Attached to the electrode taps and the electrode leads including at least a lead hole; Pouch case for receiving the electrode assembly such that the electrode lead is drawn out; And a secondary battery including a sealing tape 13 which is interposed between the inner surface of the electrode leads and the pouch case is disclosed as having venting portion pattern formed on the area corresponding to the lead hole.
[10]
However, without a separate gas discharge devices by controlling the battery cell and the inner temperature and the gas discharge of the battery pack effectively increase the stability of the battery pack is improved in safety including a heat-expandable tape to improve the charge and discharge characteristics Battery Cell and a method of manufacturing the technology not been presented.
[11]
(Patent Document 0001) Korea Patent Laid-Open Publication No. 2016-0095439 (11.08.2016)
[12]
(Patent Document 0002) Japanese Unexamined Patent Publication No. 2011-071097 (4.7.2011)
[13]
(Patent Document 0003) Japanese Patent Publication No. 5993209 (26.08.2016)
[14]
(Patent Document 0004) Korea Patent Laid-Open Publication No. 2013-0117637 (28.10.2013)
Detailed Description of the Invention
SUMMARY
[15]
The invention The main purpose is the safety including a heat-expandable tape with the features to provide a device capable of discharging the gas generated in the interior of the pouch-type secondary battery, improvement of the present invention for solving the conventional problems as described above there is a battery cell, and aims to provide a production method thereof.
[16]
Also, a further object to provide a method to discharge the inner gas of the battery cells with no additional components in the process for producing a lithium secondary battery pack.
[17]
Another object of the present invention is to provide a battery cell fixing unit having the following physico-chemical stability in a battery pack temperature and emission control of an internal generation of a gas according to the charging and discharging characteristics of the pouch type lithium secondary battery.
Problem solving means
[18]
The present invention been made in view of solving the conventional problems as described above, by the pouch electrode assembly and an electrolyte are enclosed which the pouch-shaped battery cells that are formed such that the positive electrode tab and negative electrode tab drawn out to one side of the exterior of the pouch first step; A second step of stacking (Staking) a plurality of the pouch-shaped battery cell formed by the first step; A third step of fixing by a plurality of pouch-shaped battery cell of the second step of the fixing unit to form a module unit; Characterized in that it comprises a function of, and include, the fixing unit includes discharge the temperature rise when the battery cell internal gas of the pouch-shaped battery cell; a fourth step of arranging a plurality of unit modules formed in the third step of the module case It provides a method for producing a lithium secondary battery pack as set.
[19]
Further, the fixing unit may have a thermal expansion property.
[20]
Further, the fixing unit may be a thermally expandable polymer.
[21]
Further, the fixing unit may have any one of a tape-like, band-like, tubular, box-shaped one or two or more types may be used.
[22]
Further, one side of the unit modules in the third step there is a protection circuit or PTC circuit can be formed.
[23]
In addition, the heat-expandable polymer may be composed of one selected from the group consisting of PE, PP, PS, PVC, acrylic, butyl resin.
[24]
Further, the internal gas discharge function of the fixing unit may be the temperature of the battery cells function at least 80.
[25]
Further, the fixing unit may be formed of a composite structure of a heat-expandable polymer and expanded graphite.
[26]
In addition, the inflation pressure of the fixing unit is 0.2N / mm 2 to 1.5N / mm 2 may be.
[27]
In addition, the device may be characterized in that it comprises a secondary battery produced by the production process of the lithium secondary battery pack.
[28]
In addition, the device may be a device being selected from the group consisting of an electronic apparatus, an electric vehicle, hybrid vehicle and the power storage device.
[29]
The present invention is made in view of solving the conventional problems, the pouch-shaped battery cell is formed such that the electrode assembly and an electrolyte sealed by a pouch and the positive electrode tab and negative electrode tab to the side take-off outside of the pouch as described above; After stacking a plurality of the pouch-shaped battery cell unit modules is fixed to the fixed unit; And a plurality of the unit modules includes a module array case and the fixing unit may paekil lithium secondary battery characterized in that it comprises a function of discharging the gas temperature increases when the battery cells inside the pouch-shaped battery cell.
[30]
Further, the fixing unit may have a thermal expansion property.
[31]
Further, the fixing unit may be a tape that includes at least one band forms a heat-expandable graphite.
Brief Description of the Drawings
[32]
1 is a view showing an exemplary conventional pouch-shaped electrode assembly.
[33]
2 is a view showing an exemplary conventional pouch-shaped battery cell.
[34]
3 is a diagram an exemplary pouch-shaped battery cell showing the volume expansion caused by gas.
[35]
4 is a view of the expanded graphite formed in the fixing unit according to an embodiment of the present invention.
[36]
5 is a view of the expanded graphite formed in the fixed unit of band form according to one embodiment of the present invention.
[37]
6 is a view of the two-way electrode tab type electrode assembly including a fixed unit expanded graphite is formed, in accordance with one embodiment of the present invention.
Best Mode for Carrying Out the Invention
[38]
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.
[39]
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, it means that may further contain other components.
[40]
According to the invention in the drawings will be described as in the detailed embodiment.
[41]
The first step is an electrode assembly and an electrolyte sealed by a pouch and a pouch-shaped battery cell is formed is formed such that the positive electrode tab and negative electrode tab to the side take-off outside of the pouch; A second step of stacking (Staking) a plurality of the pouch-shaped battery cell formed by the first step; A third step of fixing by a plurality of pouch-shaped battery cell of the second step of the fixing unit to form a module unit; Characterized in that it comprises a function of, and include, the fixing unit includes discharge the temperature rise when the battery cell internal gas of the pouch-shaped battery cell; a fourth step of arranging a plurality of unit modules formed in the third step of the module case It provides a method for producing a lithium secondary battery pack as set.
[42]
Fixed unit to the pouch type secondary battery including is formed so that the sealing body electrode by the pouch to be a positive electrode tab and negative electrode tab drawn out to the upper outside of the pouch a pair of pouch-shaped cells that are side-by-side stacking, including thermal expansion characteristics of the present invention, and the number of pouch-shaped cell modules included, and arranged side by side stacking the cell case is a pouch of the pouch-type cell coupled to sealing; A comprise.
[43]
The pouch-shaped cell module is formed of the pouch surrounding the outer surface of the electrode body to form the pouch body is sealed by the electrodes of the pouch-shaped cells. And is formed such that the positive electrode tab and negative electrode tab extending to one side of the electrode member drawn out of the pouch. That is, the pouch-shaped cell is in the form composed of a positive electrode tab and the negative electrode tab to the one side thereof to said electrode member is extended, the wrapping the pouch to seal only the electrode member other than the positive electrode tab and negative electrode tab. And this is the pouch-shaped cells that are formed as side-by-side is made up of a pair of stacked, the pouch-shaped cells are bonded to the outer surface of the cell case is bonded to the pouch is sealed.
[44]
That is, the portion enclosed in the pouch with the exception of the positive electrode tab and negative electrode tab of the pouch-shaped cells surrounded by the cell back into the case is closed by the cell case. At this time, the cell case is preferably formed does not adhere to the pouch so as to be a certain space in the inside.
[45]
The pouch-shaped cell module is formed such that the positive electrode tab and the negative electrode tabs drawn out to the outside of the cell case to one side, the electrode unit is enclosed by said pouch, again sealed by the combination of the cell case to the outside of the pouch is forms a structure that is sealed into 2.
[46]
At this time, the electrode member of the pouch-shaped cell is composed of a separator separating the positive electrode, negative electrode, electrolyte and the anode and the cathode is part electricity is charged and discharged, the positive electrode tab and the negative electrode tab upon discharge from said electrode member generated or a part for passing the current flowing during charging from the outside.
[47]
Pouch-shaped cell module that is formed as described above is configured to be a dog stacked side by side, the positive electrode tab or negative electrode tab is drawn out to the outside of the cell case is a pair of a positive electrode tab of a pouch-type cell module bonded and the negative electrode tab is combined negative taepwa the pouch-shaped cell modules adjacent to each other may be connected in series or in parallel.
[48]
At this time, the positive electrode tab and the negative electrode tab is coupled using a connector or a connection plate or the like, or may be bonded by laser or ultrasonic welding. In this way it is that the number of pouch-shaped cell configuring the module, there is the gas discharge port may be formed at one side of the cell case of each of the pouch-shaped cell module.
[49]
Further, the fixing unit may have a thermal expansion property.
[50]
Further, the fixing unit may be organic and / or inorganic material having a thermal expansion property.
[51]
Further, the fixing unit may be expanded graphite having a thermal expansion property.
[52]
Further, the fixing unit may be a thermally expandable polymer.
[53]
The heat expandable polymer may be a PE, PP, PS, PVC, acrylic, butyl resin one or two or more of the polymer.
[54]
Physical properties data of the heat-expandable polymer is above considerations are given in Table 1.
[55]
TABLE 1
[56]
Further, the fixing unit may have any one of a tape-like, band-like, tubular, box-shaped one or two or more types may be used.
[57]
A fixed unit having any one or two or more types of the tape-like, band-like, tubular, box-shaped and can access the battery cells stacked in the third step.
[58]
The surface of the fixed unit in contact with said stacking battery cells, may be formed with a thermoplastic pressure-sensitive adhesive.
[59]
The thermoplastic pressure-sensitive adhesive may be a PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (polyvinyl chloride), nylon (polyamide), any one selected from the group consisting of PET (polyethylene terephthalate).
[60]
Further, one side of the unit modules in the third step there is a protection circuit or PTC circuit can be formed.
[61]
In addition, the heat-expandable polymer may be composed of one selected from the group consisting of PE, PP, PS, PVC, acrylic, butyl resin.
[62]
Further, the internal gas discharge function of the fixing unit may be the temperature of the battery cells function at least 80. Preferably it is a coming of the battery cells function at least 150.
[63]
Further, the fixing unit may be formed of a composite structure of a heat-expandable polymer and expanded graphite.
[64]
In addition, the inflation pressure of the fixing unit may be a 0.2N / mm2 to about 1.5N / mm2.
[65]
The loss of the ability to secure the weight ratio beomwieul out side cells of the polymer compared to a metal, or can not be easily discharged gas.
[66]
In addition, the electronic apparatus may be a method for manufacturing a lithium secondary battery pack according to any one of the method applied.
[67]
Also may be, electric method for manufacturing a lithium secondary battery pack according to any one of the methods applied car.
[68]
It may also be a hybrid vehicle The method of manufacturing a lithium secondary battery pack according to any one of the method applied.
[69]
In addition, it may be a power storage device, a method for manufacturing a lithium secondary battery pack according to any one of the method applied.
[70]
The present invention is made in view of solving the conventional problems, the pouch-shaped battery cell is formed such that the electrode assembly and an electrolyte sealed by a pouch and the positive electrode tab and negative electrode tab to the side take-off outside of the pouch as described above; After stacking a plurality of the pouch-shaped battery cell unit modules is fixed to the fixed unit; And a plurality of the unit modules includes a module array case and the fixing unit may paekil lithium secondary battery characterized in that it comprises a function of discharging the gas temperature increases when the battery cells inside the pouch-shaped battery cell.
[71]
Further, the fixing unit may have a thermal expansion property.
[72]
Further, the fixing unit may be a tape made up of one or more bands form of thermally expandable polymer.
[73]
The heat expandable polymer may be a PE, PP, PS, PVC, acrylic, butyl resin one or two or more of the polymer.
[74]
The fixing unit may be a thermally expandable metal.
[75]
(Example)
[76]
4 is a view of the expanded graphite formed in the fixing unit according to an embodiment of the present invention.
[77]
5 is a view of the expanded graphite formed in the fixed unit of band form according to one embodiment of the present invention.
[78]
Expanded graphite formed in the fixing unit according to an embodiment of the present invention may be formed in various forms. Although Figure 4 shows the fixing unit form as whole uniformly distributed in the, form that is formed in the image stand out in particular areas, presents a shape that is formed of a scan line form a specific part, the inside of the secondary battery from an abnormal condition of the secondary battery of the fixing unit If the effect shown for the gas discharge is generated in the clear it is not limited to the shape formed.
[79]
Expanded graphite is formed in the fixed unit of band form according to one embodiment of the present invention may be formed in various forms. To Fig. 5, but presents a shape that is formed into a shape, firing line form in a specific area which is formed by the fixed unit form as whole uniformly distributed in the, form stand out a specific part, the current flows in the abnormal condition of the secondary battery of the fixing unit If the effect appeared to stop is apparent is not limited to the shape formed.
[80]
6 is a view of the two-way electrode tab type electrode assembly including a fixed unit expanded graphite is formed, in accordance with one embodiment of the present invention. An electrode assembly in which the fixing unit is formed is apparent that can be formed in a one-way electrode tab form.
[81]
The present invention in the above been described in detail with reference to the described embodiments, the present Those invention with a conventional, in which a number of substitutions, additions and modifications without departing from the scope of the technical concept described in the above It will be will be understood that the natural, such modified embodiment also belongs to the protection scope of the invention as appointed by the appended claims below.
Industrial Applicability
[82]
According to the method for manufacturing the heat-expandable tape with safety-improving battery cells containing and derivatives according to the invention, it is to discharge the gas generated in the interior of the pouch-type secondary battery, the effect to improve the safety of the pouch type secondary battery pack .
[83]
In addition, the present invention is used, so the pressure of the gas generated in the interior of the secondary battery is possible to operate without a separate external power source device and effect.
[84]
In addition, the present invention has a repetitive emission effect by the configuration of the heat-expandable fixed unit.
[85]
In addition, large amounts of the present invention is composed of side-by-side comprises a fixed unit of a number of pouch-shaped cell modules stacked arrangement, that is to have ignitable gases when the internal short circuit or overcharge of the pouch-shaped cells occurs discharged while bursting a part of the pouch to be able to quickly discharge the combustible gas, by stabilizing the temperature and the voltage of the pouch-shaped cell module, there is an effect that reduces the potential ignition or explosion of the battery module consisting of a plurality of pouch-shaped battery cell.

Claims

[Claim 1]The first step is an electrode assembly and an electrolyte sealed by a pouch and a pouch-shaped battery cell is formed is formed such that the positive electrode tab and negative electrode tab to the side take-off outside of the pouch; A second step of stacking (Staking) a plurality of the pouch-shaped battery cell formed by the first step; A third step of fixing by a plurality of pouch-shaped battery cell of the second step of the fixing unit to form a module unit; Characterized in that it comprises a function of, and include, the fixing unit includes discharge the temperature rise when the battery cell internal gas of the pouch-shaped battery cell; a fourth step of arranging a plurality of unit modules formed in the third step of the module case method for manufacturing a lithium secondary battery pack as set.
[Claim 2]
The method of claim 1, wherein the fixing unit includes method for producing a lithium secondary battery pack characterized in that it has a thermal expansion characteristic.
[Claim 3]
The method of claim 2, wherein the fixing unit includes method for producing a lithium secondary battery pack, characterized in that heat-expandable polymer.
[Claim 4]
The method of claim 2, wherein the fixing unit includes method for producing a lithium secondary battery pack, characterized in that either one or two or more types of tape-like, band-like, tubular, box-applied.
[Claim 5]
The method of claim 1, wherein the method for manufacturing a lithium secondary battery pack characterized in that the protective circuit or PTC circuit one side of the unit modules in the third step of forming.
[Claim 6]
4. The method of claim 3 wherein the heat-expandable polymer is method of manufacturing a lithium secondary battery pack according to claim consisting of one selected from the group consisting of PE, PP, PS, PVC, acrylic, butyl resin.
[Claim 7]
The method of claim 1, wherein the inner gas discharge function of the fixing unit The production method of a lithium secondary battery pack characterized in that the temperature of the battery cells function at least 80.
[Claim 8]
The method of claim 3, wherein the fixing unit includes method for producing a lithium secondary battery pack, characterized in that the composite structure consisting of the heat-expandable polymer and expanded graphite.
[Claim 9]
The method of claim 8, wherein the inflation pressure of 0.2N / mm2 to about 1.5N / mm2 in the lithium secondary battery production method, characterized in that the fixed unit.
[Claim 10]
Any one of claims 1 to 9, wherein of the device comprising a, a secondary battery produced by the production method of the lithium secondary battery pack according to any of the preceding.
[Claim 11]
11. The method of claim 10, wherein the device is a device wherein is selected from the group consisting of an electronic apparatus, an electric vehicle, hybrid vehicle and the power storage device.
[Claim 12]
Pouch-shaped battery cell formed by the pouch to the electrode assembly and an electrolyte and sealed with the positive tab and the negative electrode tabs drawn out to the outer side of the pouch; After stacking a plurality of the pouch-shaped battery cell unit modules is fixed to the fixed unit; It said unit and the plurality of modules includes a module array case, the fixing unit is a lithium secondary battery pack characterized by comprising a function for discharging the gas inside the battery cells during the temperature rise of the pouch-shaped battery cell.
[Claim 13]
The method of claim 12, wherein the fixing unit is a lithium secondary battery pack characterized in that it has a thermal expansion characteristic.
[Claim 14]
The method of claim 13, wherein the fixing unit is a lithium secondary battery pack characterized in that the tape contains more than one band, the form of the heat-expandable graphite.