[1]Mutual citations and related applications
[2]This application claims the benefit of priority based on the September 19, Korea Patent Application No. 10-2016-0119146 and 09 years May 13, 2017 Date of Korea Patent Application No. 10-2017-0117320, 2016, and of the Korea Patent Application everything described in the literature are included as part of the specification.
[3]Art
[4]The present invention relates to a secondary battery.
BACKGROUND
[5]
This secondary battery has been developed, unlike primary cells, rechargeable, and due also to the small size and large capacity much potential research in recent years. The demand for secondary batteries as an energy source has increased dramatically as the development of technology and demand for mobile devices increases.
[6]
This secondary battery according to the shape of the battery case, the nose is classified as type battery, a cylindrical battery, a prismatic battery, and a pouch-shaped battery. The electrode assembly mounted inside the battery case in a secondary battery is a power generation device capable of charge and discharge made of a stacked structure of electrodes and separators.
[7]
The electrode assembly is interposed a separator between the anode and the cathode of the active material is applied to a sheet-like (介 在) by winding the jelly roll (Jelly-roll) stacked one type, stacking a plurality of positive and negative electrodes in a membrane interposed state type by, and a take-up stack of unit cells stacked as separate film of the longer length / folding type can be roughly classified.
[8]
In recent years, such as a pouch-type battery of a structure built in the stacking or stacking / folding type electrode assembly in a pouch-shaped battery case made of aluminum laminate sheet, and low manufacturing cost, small weight, easy deformation reasons, collect a lot of attention and also its usage increases gradually.
Detailed Description of the Invention
SUMMARY
[9]
One aspect of the present invention is to provide a secondary battery that can increase the energy density in addition to the two shillings foldable folding part forming the battery case to a storage form.
[10]
Further, another aspect of the present invention is to provide a secondary battery capable of preventing damaging the insulation on the folding portion of the battery case occurred.
Problem solving means
[11]
A secondary battery according to an embodiment of the present invention, the cell case, comprising: a battery case that the electrode and the separator having a receiving the electrode assembly and the electrode assembly that is formed by alternately stacked therein is a step portion formed stepped in the upper form and, the outer surface of the battery case and the section is folded folding seals mounted on the outer surface of the step portion, the electrode assembly is a stepped jaw formed is formed stepped in a form corresponding to the inner surface of the step portion is formed in the battery case It can be.
Effects of the Invention
[12]
According to the invention, is added to form a step in a battery case and added sealing portion is folded folding the battery case housing is seated on the outer stepped portion, an electrode assembly is formed so that the inside of the battery case corresponding to the step portion of the battery case, it can ensure maximum energy density.
[13]
According to the present invention, by sealing the part other than the bent portion at the folding portion of the battery case it can be prevented from damage to the insulation due to cracking in the bent portion sealing region is generated.
[14]
And, according to the present invention, having a locking step at the top is a folding portion of the battery case mounted, without folding the end portion release by the retaining jaws can be coupled to the folding parts of the solid fixed so unsolved.
Brief Description of the Drawings
[15]
1 is a front view showing a rechargeable battery according to a first embodiment of the present invention.
[16]
Figure 2 is a schematic diagram showing in perspective the A region shown in Fig.
[17]
3 is a front view showing an electrode assembly in a rechargeable battery according to a first embodiment of the present invention.
[18]
Figure 4 is a perspective view illustrating a rechargeable battery according to a first embodiment of the present invention.
[19]
Figure 5 is a perspective view of an electrode assembly according to a first embodiment of the present invention.
[20]
Figure 6 is a partial cross-sectional view showing a rechargeable battery according to a second embodiment of the present invention.
[21]
7 is a perspective view illustrating a rechargeable battery according to a third embodiment of the present invention.
[22]
Figure 8 is a side view showing a rechargeable battery according to a third embodiment of the present invention.
[23]
Figure 9 is a schematic diagram showing in perspective the B area shown in Fig.
[24]
10 is a perspective view of an electrode assembly according to a third embodiment of the present invention.
[25]
11 is a bottom perspective view illustrating a rechargeable battery according to a fourth embodiment of the present invention.
[26]
Figure 12 is a side view showing a rechargeable battery according to a fourth embodiment of the present invention.
[27]
13 is a perspective view of an electrode assembly according to a fourth embodiment of the present invention.
Best Mode for Carrying Out the Invention
[28]
An object of the present invention, particular advantages, and novel features will become more apparent from the detailed description and the preferred embodiments below that in connection with the accompanying drawings. In addition as the reference numerals to components in the drawings herein, hanhaeseoneun to like elements even though shown in different drawings, even if should be noted that and to have the same number as possible. In addition, the present invention is not be implemented in many different forms and limited to the embodiments set forth herein. Then, in the following description, detailed description of the related art which may unnecessarily obscure the subject matter of the present invention will be omitted.
[29]
[30]
1 is a front view showing a rechargeable battery according to a first embodiment of the present invention, Figure 2 is a schematic diagram showing in perspective the A region shown in Fig.
[31]
With reference to Figures 1 and 2, the secondary battery 100 according to the first embodiment of the present invention includes a battery case 120 accommodating the electrode assembly 110 and electrode assembly 110, a battery case ( 120) is formed with a step portion 124 and the folding unit 125.
[32]
[33]
In the following, with reference to Figs. 1 and 3, will be described in more detail with respect to the first embodiment of the secondary battery of the present invention.
[34]
When reference to Fig. 1 and 2, the battery case 120 may include an upper case 122 and lower case 121 accommodating the electrode assembly 110 and an electrolyte therein.
[35]
The lower case 121 is formed with a receiving portion 123 of the electrode assembly 110 and electrolyte are accommodated, the upper case 122 may be provided so as to cover the opening of the receiving portion 123. Here, it can be secured to the upper case 122 and seals the outer surface, along the lower case (121) (Sealing) and is folded (Foding) form a folding portion 125, and the stepped portion 124. The
[36]
Step part 124 may be formed to be stepped at the top of the battery case (120). At this time, the stepped portion 124 may be formed on the upper side of the battery case (120).
[37]
Further, the stepped portion 124 may be formed to be stepped in the form as the outer surface corresponding to the folding unit 125.
[38]
Folding portion 125 is formed in the outer surface of the sealing portion of the battery case 120 is folded, and can be formed with a bent portion (125a) bending when folding. Here, the outer surface of the battery case 120 can be folded with the exception of the bent part (125a) and sealed. Accordingly, it is possible to prevent the insulation damage due to cracks in the sealing portion of the battery case 120, the bent portion (125a) in the process of folding the wing (Wingfolding) to fold the sealing region of the outer peripheral surface of the generation. In particular, the battery case 120 can be prevented when formed of a laminate sheet, the insulation damage due to cracking of the cured by bending from the sealing region of the bent portion (125a), the polymer layer generated by a polymer.
[39]
Further, the folding portion 125 is secured to the outer surface of the step portion 124 can be accommodated.
[40]
In addition, the folding unit 125 may be attached through a tape or adhesive agent to the outer surface of the step portion 124, for example.
[41]
Then, the folding unit 125 may be fixed through heat seal to the outer surface of another example step (124). In this case, the folding portion 125 is a portion other than the bent portion (125a) can be secured to the welded to the step portion 124.
[42]
[43]
3 is a front view showing an electrode assembly in a rechargeable battery according to a first embodiment of the present invention.
[44]
2 and referring to Figure 3, the electrode assembly 110 as the power generation element can be charged and discharged, the electrode 113 and the separator 114 are aggregated to form a laminated alternately.
[45]
Electrode 113 may be composed of the positive electrode 111 and negative electrode 112. The In this case, the electrode assembly 110 may be formed of a positive electrode 111 / separator 114 / negative electrode 112 laminated in this shift.
[46]
Membrane 114 is electrically insulated through the insulating material consists of a positive electrode 111 and negative electrode 112. The Here, the separator 114 is, for example, be formed of a polyolefin-based resin film such as polyethylene, polypropylene having a non-porous.
[47]
The electrode assembly 110 includes a stepped jaw 115 in the form corresponding to the inner surface of the stepped portion 124 of the battery case 120 is formed on top. Here, the stepped jaw 115 may be formed on the upper side of the electrode assembly 110.
[48]
Then, the step height (h1) of the stepped jaw 115 may correspond to the step height (h2) of the step portion 124. The
[49]
In addition, the electrode assembly 110 has a width (w1) the entire width of the battery case, step portion 124, the electrode assembly 110 so as to correspond to the 120 of the electrode 113 and the separator 114 at the top ( It may be formed narrower than w2).
[50]
On the other hand, the outer surface is formed along the periphery of the electrode assembly 110 may be formed in the shape corresponding to the inner surface of the battery case (120). At this time, the inner surface of the outer surface of the battery case 120 of the electrode assembly 110 may be provided to come into close contact.
[51]
[52]
On the other hand, the energy density per volume increase of the cell (Cell) can be obtained from equation (1) below.
[53]
[Formula 1]

[54]
D: volume energy density increase
[55]
L: height of the positive electrode of the cell (Cell)
[56]
W: width of the positive electrode of the cell
[57]
S: monocell(stack) 수
[58]
A: Drawdown cell area due to the conventional folding structure
[59]
B: Drawdown uppermost anode due to the structure of a secondary battery according to the first embodiment of the present invention
[60]
Here, for example, the L of 250mm, 100mm W, S 29, if the A as 2.8mm, 14mm to B, the energy density per volume increment (D) is [{(250 * 2.8 * 29) - (250 * 14 * it can be seen that: 1)} / (250 * 100 * 29) = 0.023 = 2.3%. Accordingly, a first exemplary electrode assembly 110 of a secondary battery according to Examples of the present invention can be seen, the energy density to be increased.
[61]
As a result, the secondary battery 100 according to the first embodiment of the present invention includes a step portion 124 on the upper side of the battery case 120 is formed and accommodating the folding unit 125, so that the electrode assembly (110 corresponding ), it is added to form a conventional folding the battery case side can be seen that the energy density per volume than a structure is decreased as a whole width of the electrode assembly is increased as the structure in which only the width of the portion reduced unit cell located at the top side of. That is, by folding the wings of a conventional folding unit cell case than the form in which the reduced overall side width of the electrode assembly, a folding section 125 of the present invention, the step portion 124 formed on the upper side of the battery case 120, housed in the structure for reducing only the width of the top of the electrode assembly 110 it can be seen that increasing the volume energy density.
[62]
[63]
4 is a perspective view illustrating a rechargeable battery according to a first embodiment of the present invention, Figure 5 is a perspective view of an electrode assembly according to a first embodiment of the present invention.
[64]
4 and referring to Figure 5, the secondary battery 100 according to the first embodiment of the invention the electrode lead (140 150 extends so as to project to the outer side of the electrically coupled to the electrode assembly 110, a battery case 120, ) may further include a.
[65]
Electrode leads (140 150) may include a positive electrode 111 and the electrically positive electrode lead 140 and the cathode 112 and the electrically negative electrode lead 150 is connected to connected to the electrode assembly 110.
[66]
Here, for example, the positive electrode lead 140 is projected in the front end of the battery case 120, a negative electrode lead 150 may be projected in the rear end of the battery case (120).
[67]
[68]
Figure 6 is a partial cross-sectional view showing a rechargeable battery according to a second embodiment of the present invention.
[69]
Referring to Figure 6, the secondary battery 200 according to the second embodiment of the present invention, an electrode assembly 110 and the battery case 220, and the battery case 220 includes a stepped portion 224 and folding and a unit (225). In this case, the battery case 220 may be formed to include an upper case 222 and lower case 121, including the step portion 224 and the folding unit 225 and the locking step 226. The
[70]
A secondary battery 200 according to the second embodiment of the present invention as compared with the secondary battery 100 according to the first embodiment described above, the folding portion 225 of the battery case 220 and folding a two-stage, cell the difference is further formed an engaging shoulder 226 on the case 220 is present. Thus, the present embodiment is to describe about the first embodiment is the same as information, for example, and is briefly described, differences.
[71]
More particularly, the folding unit 225 is a two-stage folded from the lateral side ends of the battery case 220, a first bending portion (225a) and a second bent part (225b) may be formed sequentially.
[72]
Locking step 226 is formed in the folding portion 225 protruding in the direction to the top of the stepped portion 224 of the battery case 220, the end portion of the folding unit 225 to be interrupted from being detached from the step portion 224 It can be formed.
[73]
In addition, the locking jaw 226 is round (Round) which is formed in the form, located at the end of the folding portion 225, the second bent part (225b), the engaging shoulder so as not departing from the step portions 224, 226 It can be combined.
[74]
Here, the engaging shoulder 226 formed at the top step part 224 of the battery case 220, a second bent part (225b), the engaging shoulder so as not departing from the step portion 224 of the folding unit 225 ( 226) can be coupled to the interference fit. At this time, the second bent part (225b) can be bent to a round shape.
[75]
On the other hand, the step height (h2 ') of the stepped portion 224 may correspond to the height (h3) of the folding unit 125.
[76]
[77]
Figure 7 is a perspective view illustrating a rechargeable battery according to a third embodiment of the present invention, Figure 8 is a side view showing a rechargeable battery according to a third embodiment of the present invention.
[78]
Further, FIG. 9 is a schematic diagram showing in perspective the B region shown in Figure 8, Figure 10 is a perspective view of an electrode assembly according to a third embodiment of the present invention.
[79]
Referring to Figs. 7 to 10, the secondary battery 300 according to the third embodiment of the present invention includes an electrode assembly 310 and the battery case 320, a battery case 320 has step portions (324 ) and a folding unit 325, the electrode assembly 310 includes a stepped jaw 315.
[80]
A secondary battery 300 according to the third embodiment of the present invention includes a step of, when compared with the secondary battery 200 according to the secondary battery 100 and the other embodiments according to the first embodiment described above, the battery case 320, portion has a step jaw 315, the difference in section is formed of (324) and the electrode assembly 310.
[81]
Thus, the present embodiment information is the same as the first embodiment and other embodiments will be briefly described, and the technique with the focus on the differences.
[82]
To be more specific, referring to Figs. 7 to 10, the step portion 324 formed in the secondary battery 300, a battery case 320 in accordance with a third embodiment of the present invention includes a first step portion (324a) and a second It may include a step portion (324b). Here, for example, a first step portion (324a) is formed on the upper side, and the second stepped portion (324b) of the battery case 320 may be formed on the lower rear end of the battery case (320).
[83]
In addition, the stepped jaw 315 formed on the electrode assembly 310 may include a first stepped projection (315a) and a second stepped projection (315b). Here, for example, a first stepped projection (315a) is formed in the upper side portion, a second stepped projection (315b) of the electrode assembly 310 may be formed on the lower rear end portion of the electrode assembly 310.
[84]
On the other hand, electrode upper side of the assembly 310 can be formed into a shape corresponding to the first step portion the second step portion (324b), a lower rear end portion of the electrode assembly 310 is formed into a shape corresponding to (324a) have.
[85]
The folding unit 325 to face the end surface of the battery case 320, the first and the primary folding to rest on the step portions (324a), the first folding portion (325a), the battery case 320 of the secondary folding 2 to rest on the second step portion (324b) of the folded portion (325b) and the battery case 320 may include a third folding portion (325c), the folded tertiary.
[86]
A secondary battery 300 according to the third embodiment of the present invention may further include an electrode lead (340 350) extending to and electrically connected to project outwardly of the battery case 320 to the electrode assembly 310.
[87]
Electrode leads (340 350) may include a positive electrode 111 and the electrically positive electrode lead 340 and the cathode 112 and the electrically negative electrode lead 350 is connected to connected to the electrode assembly 310.
[88]
Here, for example, the positive electrode lead 340 and the negative electrode lead 350 may be projected in the front end of the battery case (320).
[89]
Configured as described above, the secondary battery 300 according to the third embodiment of the present invention when provided to a side of the electrode lead (340 350) the battery case (320), first folding the upper side of the battery case 320, portion (325a) is to form a first step portion (324a) to be received, in addition further form a third folding portion (325c) and a second stepped portion (324b) which is housed in the lower rear end of the battery case 320, can. In this case, the electrode assembly 310 was formed in the form corresponding to the inner side of the battery case 320, it is possible to more possible to secure the energy density of the secondary battery 300.
[90]
[91]
11 is a fourth embodiment is a bottom perspective view illustrating a secondary battery according to the embodiment, and Figure 12 is a side view showing a rechargeable battery according to a fourth embodiment of the present invention, Figure 13 is a fourth embodiment of the present invention of the present invention according to a perspective view of an electrode assembly.
[92]
Referring to Figure 11 - Figure 13, the secondary battery 400 according to the fourth embodiment of the present invention includes an electrode assembly 410 and the battery case 420, a battery case 420 has step portions (424 ) and a folding unit 425, the electrode assembly 410 includes a stepped jaw 415.
[93]
A secondary battery 300 according to the fourth embodiment of the present invention according to the first embodiment described above the secondary battery 100 and second rechargeable according to an exemplary embodiment cell 200 and a rechargeable battery according to the third embodiment as compared to 300, the stepped jaw 415, the difference in section is formed in the step portion 424 and the electrode assembly 410 of the battery case (420).
[94]
Thus, the present embodiment information is the same as the first to third embodiments will be briefly described, and the technique with the focus on the differences.
[95]
In more detail, Figures 10 to Referring to Figure 12, the stepped portion 424 formed in the battery case 420 in the secondary battery 400 according to the fourth embodiment of the present invention, after the lower side of the battery case 420, an end It can be formed.
[96]
In addition, the stepped jaw 415 formed on the electrode assembly 410 may be formed on the lower rear end portion of the electrode assembly 410.
[97]
On the other hand, the lower rear end of the electrode assembly 410 may be after the lower side of the battery case 420 is formed into a shape corresponding to the step portion 424 formed at an end.
[98]
The folding unit 425 to face the end surface of the battery case 420, the first fold of the first folded portion (425a) and a battery case 420, the second folding the second folding to the rest on the stepped portion 424 It may comprise a portion (425b).
[99]
A secondary battery 400 according to the fourth embodiment of the present invention may further include an electrode lead (440 450) extending to and electrically connected to project outwardly of the battery case 420 to the electrode assembly 410.
[100]
2, the secondary battery 400 according to the fourth embodiment of the present invention, when the electrode lead (440 450) is positioned at the front end of the battery case 420, a lower rear end portion of the battery case 420 configured as above that the folding portion (425b) housing may be formed a step portion 424. In this case, the electrode assembly 410 is formed into a shape corresponding to the inside of the battery case 420, it is possible to more possible to secure the energy density of the secondary battery 400.
[101]
[102]
Above been described in detail and the present invention through specific embodiments, This is to be described in detail the present invention, and is not a secondary battery according to the present invention is not limited thereto. The various embodiments by those skilled in the art within the spirit of the present invention will be that it is possible.
[103]
In addition, the specific scope of protection of the invention will become clear by the following claims.

Claims

[Claim 1]The electrode assembly is formed with the electrode and the separator are alternately stacked; And the cell case, comprising: a battery case for accommodating therein the electrode assembly is a stepped portion formed stepped formed, are added outside the side sealed folding the folding of the battery case mounted on the outer surface of the step portion, wherein the electrode assembly is a secondary battery that is the stepped jaw formed as a stepped shape corresponding to the inner surface of the step portion is formed in the battery case forming.
[Claim 2]
The method according to claim 1, wherein the secondary battery is stepped outer surface portion which is formed stepped in a form corresponding with the folded portion.
[Claim 3]
The method according to claim 1, wherein the cells of the step of the case portion is formed on the upper side of the battery case, the stepped jaw of the electrode assembly is formed on an upper side of the electrode assembly, the electrode assembly includes a said electrode at the top and a secondary battery that is formed narrower so that the width of said separator corresponding to said step portion of said battery case.
[Claim 4]
The method according to claim 3, the outer surface of the stepped projection is formed along the periphery of the electrode assembly is formed of a shape corresponding to the inner surface of the stepped portion of the battery case, and the outer surface of the stepped projection of the electrode assembly the inner surface of the stepped portion of the battery case is a secondary battery which is provided to come into close contact.
[Claim 5]
The method according to claim 1, wherein the folding unit secondary battery which is attached via the adhesive tape or the outside face of the step portion.
[Claim 6]
The method according to claim 1, wherein the folding portion is formed a bent portion bent, the outer surface of the battery case is folded secondary battery portion other than the bent portions are sealed.
[Claim 7]
The method according to claim 6, the secondary battery fixed in the folded portion is in areas other than the bent portion is heat-sealed to the outer surface of the step portion.
[Claim 8]
The system according to claim 7, wherein the battery case is formed with the lower case portion receive for receiving the electrode assembly, which is formed, the outer surface of an upper case covering the said housing, and with the upper case of the lower case is folded together parts of the foldable and the step portion which is seated in the secondary battery.
[Claim 9]
The method according to claim 1, the step height of the stepped portion rechargeable battery corresponding to the height of the folded portion.
[Claim 10]
A method according to any one of claims 1 to 9, the foldable portion is foldable bunk first bent portion and a second bent portion formed in a secondary battery sequentially.
[Claim 11]
The method according to claim 10, is formed protruding from the upper end of the step portion as the foldable portion direction, the folding portion end locking step is formed to regulate the secondary battery from being detached from the step portion.
[Claim 12]
The method according to claim 11, wherein the locking step is formed of a round (Round) form the second bent portion of the secondary battery coupled to the locking step to prevent departure from the step portion which is located at the folded end portion.
[Claim 13]
The method according to claim 1, wherein the step of the battery case portion includes a second step formed on the lower rear end of the first step portion and the battery case formed in an upper side portion of the battery case, the stepped jaw of the electrode assembly is the the formed on the upper side of the electrode assembly 1, the stepped jaw and a secondary battery including a second stepped jaws formed on the lower rear end portion of the electrode assembly.
[Claim 14]
The method according to claim 13, the upper side of the electrode assembly is first formed in the form corresponding to the step portion, the lower rear end of the electrode assembly of a secondary battery is formed into a shape corresponding to said second step.
[Claim 15]
The method according to claim 13, wherein said folding portion, the step portion to be secured to the first part primary folded first folding of the battery case; Part 2 after folding the battery case to face the end face of the secondary folded; And a secondary battery comprising a second tertiary folding seat so that the step portion the third folding portion of the battery case.
[Claim 16]
The method according to claim 1, wherein the step of the battery case portion is formed at a lower rear end portion of the battery case, the stepped jaw secondary battery formed in the lower rear end portion of the electrode assembly of the electrode assembly.
[Claim 17]
The method according to claim 16, wherein the folding unit, the battery case and the section so that the first folding portion of the primary folding after the face-to-face; And a secondary battery comprising the step portion to be secured to the second folding the second folding portion of the battery case.