WO2024214940A1 - 파우치형 전지셀 - Google Patents
파우치형 전지셀 Download PDFInfo
- Publication number
- WO2024214940A1 WO2024214940A1 PCT/KR2024/002017 KR2024002017W WO2024214940A1 WO 2024214940 A1 WO2024214940 A1 WO 2024214940A1 KR 2024002017 W KR2024002017 W KR 2024002017W WO 2024214940 A1 WO2024214940 A1 WO 2024214940A1
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- WO
- WIPO (PCT)
- Prior art keywords
- case
- pouch
- battery cell
- edge
- shaped battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
- H01M50/136—Flexibility or foldability
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a pouch-type battery cell.
- While small mobile devices generally use one or two or three secondary batteries, medium and large devices such as electric vehicles use battery modules in which a number of secondary batteries are electrically connected, or battery packs in which a plurality of battery modules are electrically connected to each other, due to the need for high output and large capacity.
- Lithium secondary batteries can be classified into can-type, square-type, and pouch-type depending on the shape of the outer packaging material.
- pouch-type secondary batteries are widely used in medium and large-sized battery modules due to their advantages of high energy density and easy stacking.
- a pouch-type battery cell has a structure in which an electrode assembly is accommodated in a pouch-type battery case and a sealing portion is formed at the edge of the battery case.
- TP thermal propagation
- the problem to be solved by the present invention is to provide a pouch-type battery cell configured so that gas is discharged in a preset direction when the internal pressure of a cup portion in which an electrode assembly is accommodated increases.
- a pouch-type battery cell may accommodate an electrode assembly between a first case and a second case.
- the pouch-type battery cell may include: a cup portion formed in at least one of the first case and the second case and accommodating the electrode assembly; a folding portion in which an edge portion of the first case surrounds an edge portion of the second case so that a discharge path is formed between the edge portion of the first case and the edge portion of the second case; a sealing portion formed in the folding portion; and a venting portion in which a portion of the folding portion is sealed less weakly than the sealing portion or is not sealed so that the cup portion and the discharge path are connected when the internal pressure of the cup portion increases.
- the above sealing portion and venting portion can be located between the cup portion and the discharge path.
- the above folding portion may include a first facing portion facing one side of the edge portion of the second case; a second facing portion facing the other side of the edge portion of the second case; and a connecting portion connecting the first facing portion and the second facing portion and bending or curving at a predetermined interval with an end of the edge portion of the second case.
- the discharge path may be formed within the connecting portion.
- the thickness of the connecting portion in a direction parallel to the thickness of the edge portion of the second case may be greater than the sum of the thickness of the first facing portion, the thickness of the edge portion of the second case, and the thickness of the second facing portion.
- the width of the discharge path in a direction parallel to the thickness of the edge portion of the second case may be greater than the thickness of the edge portion of the second case.
- the above connecting portion may include a curved surface formed convexly outwardly.
- the above sealing portion can be formed by sealing the first facing portion and the second facing portion with the edge portion of the second case.
- venting portion can be formed by the edge portions of the first facing portion and the second case being unsealed or weakly sealed to each other.
- the above discharge path extends in the direction of the full length or full width of the cup portion and at least one end can be open.
- venting portions may be provided in multiple numbers along the perimeter of the first case and the second case.
- the above folding portions and venting portions are provided in plurality, and the plurality of folding portions may include a first folding portion extending in the full length direction of the cup portion; and a second folding portion extending in the full width direction of the cup portion.
- the plurality of venting portions may include a first venting portion located on the outer side of the long side of the cup portion and connecting the exhaust passage within the cup portion and the first folding portion when the internal pressure of the cup portion increases; and a second venting portion located on the outer side of the short side of the cup portion and connecting the exhaust passage within the cup portion and the second folding portion when the internal pressure of the cup portion increases.
- a pouch-shaped battery cell may accommodate an electrode assembly between a first case and a second case.
- the pouch-shaped battery cell may include: a cup portion formed in at least one of the first case and the second case and accommodating the electrode assembly; a folding portion in which an edge portion of the first case surrounds an edge portion of the second case so that a discharge path is formed between the edge portion of the first case and the edge portion of the second case; a sealing portion formed in the folding portion; and a gas discharge member disposed between the cup portion and the discharge path and made of a gas-permeable material.
- the above gas discharge member may include an absorbent material.
- the inner end of the above gas discharge member can be exposed to the inside of the cup portion.
- the outer end of the above gas discharge member may protrude further than the end of the edge of the second case.
- the above folding portion may include a first facing portion facing one side of the edge portion of the second case; a second facing portion facing the other side of the edge portion of the second case; and a connecting portion connecting the first facing portion and the second facing portion and bending or curving at a predetermined interval with an end of the edge portion of the second case.
- the discharge path may be formed within the connecting portion.
- the above gas discharge member may be provided in multiple numbers along the perimeter of the first case and the second case.
- the gas within the cup portion can be discharged sequentially through the discharge paths within the vent portion and the folding portion. Accordingly, by discharging the gas in a preset direction, the pouch-type battery cell can be prevented from exploding, and thermal propagation (TP) to other surrounding battery cells can be prevented due to the explosion.
- TP thermal propagation
- the discharge path can be simply and easily implemented using only the folding part without a separate device or additional sealing process.
- the gas within the cup portion can be discharged sequentially by passing through the gas discharge member and the discharge path within the folded portion.
- the internal pressure of the cup portion can be maintained at an appropriate level, and there is an advantage in that the pouch-type battery cell can be continuously used.
- configurations according to preferred embodiments of the present invention may include effects that can be easily predicted by those skilled in the art.
- FIG. 1 is a perspective view illustrating a case and electrode assembly of a pouch-type battery cell according to a first embodiment of the present invention.
- Figure 2 is a plan view of a pouch-shaped battery cell according to the first embodiment of the present invention.
- Figure 3 is a partial cross-sectional view along line A-A' of Figure 2.
- Figure 4 is a partial cross-sectional view taken along line B-B' of Figure 2.
- Figure 5 is a drawing showing a modified example of the connection part shown in Figures 3 and 4.
- Figure 6 is a plan view of a pouch-shaped battery cell according to a second embodiment of the present invention.
- Figure 7 is a partial cross-sectional view taken along line C-C' of Figure 6.
- Figure 8 is a plan view of a pouch-shaped battery cell according to a third embodiment of the present invention.
- Figure 9 is a plan view of a pouch-shaped battery cell according to the fourth embodiment of the present invention.
- Fig. 10 is a partial cross-sectional view taken along line D-D' of Fig. 9.
- FIG. 1 is a perspective view illustrating a case and an electrode assembly of a pouch-type battery cell according to a first embodiment of the present invention
- FIG. 2 is a plan view of a pouch-type battery cell according to the first embodiment of the present invention
- FIG. 3 is a partial cross-sectional view taken along line A-A' of FIG. 2
- FIG. 4 is a partial cross-sectional view taken along line B-B' of FIG. 2.
- a pouch-shaped battery cell (10) according to the first embodiment may include a pair of cases (100) and an electrode assembly (200). More specifically, the pouch-shaped battery cell (10) may be manufactured by accommodating an electrode assembly (200) between a first case (100A) and a second case (100B).
- the first case (100A) and the second case (100B) can be sealed to contain an electrode assembly (200) together with an electrolyte to form a pouch-type battery cell (10).
- the electrode assembly (200) may include an anode, a cathode, and a separator interposed between the anode and the cathode to insulate them.
- the type of the electrode assembly (200) is not limited.
- the electrode assembly (200) may be a stack-type electrode assembly in which the anode and the cathode are alternately stacked with the separator interposed therebetween.
- the electrode assembly (200) may be a jellyroll-type electrode assembly in which sheet-shaped anodes and cathodes are rolled together with the separator interposed therebetween.
- the combination of the first case (100A) and the second case (100B) provides a storage space capable of accommodating the electrode assembly (200) and may have an overall pouch shape.
- first case (100A) and one side of the second case (100B) are connected to each other, and the connected portions can form a folding area (103). That is, a pair of cases (100) can be integrally connected by the folding area (103).
- first case (100A) and the second case (100B) may be provided as separate components that are subsequently sealed together.
- Each case (100) may include a first resin layer forming the innermost layer, a second resin layer forming the outermost layer, and a metal layer positioned between the first resin layer and the second resin layer. That is, each case (100) may be manufactured by forming a laminate film including the first resin layer, the second resin layer, and the metal layer.
- the first resin layer forming the innermost layer may be in direct contact with or adjacent to the electrode assembly (200) and the electrolyte. Therefore, the first resin layer may be formed of a material having high insulation and high corrosion resistance.
- the first resin layer may include a polypropylene (PP) material.
- PP polypropylene
- the first resin layer is not limited thereto, and a person skilled in the art may appropriately select the material of the first resin layer.
- the second resin layer forming the outermost layer can protect the pouch-shaped battery cell (10) from friction and collision with the outside, while electrically insulating the electrode assembly (200) from external objects.
- the second resin layer can include a polyethylene terephthalate (PET) material.
- PET polyethylene terephthalate
- the second resin layer is not limited thereto, and a person skilled in the art can appropriately select the material of the second resin layer.
- At least one of the first resin layer and the second resin layer may be provided with a structure including two or more layers to improve formability and adhesiveness.
- the above metal layer can secure the mechanical strength of the case (100), block the ingress of external gas or moisture, and prevent leakage of electrolyte.
- the metal layer may include aluminum (Al) or stainless steel (STS) material.
- Al aluminum
- STS stainless steel
- the metal layer is not limited thereto, and a person skilled in the art can appropriately select the material of the metal layer.
- the pouch-type battery cell (10) is formed in at least one of the first case (100A) or the second case (100B) and may include a cup portion (110) that accommodates an electrode assembly (200).
- the cup part (110) can be formed by drawing and molding the laminate film, which is the base material of the case (100), and recessing it to a predetermined depth.
- the cup portion (110) may be provided in each of the first case (100A) and the second case (100B).
- the electrode assembly (200) may be accommodated in a receiving space defined by a pair of cup portions (110).
- the present invention is not limited thereto, and the cup portion (110) may be provided in only one of the first case (100A) and the second case (100B). That is, a case that does not include the cup portion (110) may be flat.
- the first case (100A) and the second case (100B) may include an edge portion (120) positioned around the cup portion (110).
- the edge portion (120) may also be referred to as a terrace portion.
- the edge portions (120) of the first case (100A) and the second case (100B) may be positioned to contact each other and may be sealed together, thereby sealing the electrode assembly (200) within the first case (100A) and the second case (100B).
- the folding area (103) can be folded so that the edges (120) of the first case (100A) and the second case (100B) are in contact with each other.
- the edges (120) that are in contact with each other can form three sides of the pouch-shaped battery cell (10), and the folding area (103) can form the remaining one side. Accordingly, the sealing portion (150) described below can be formed on the three sides of the pouch-shaped battery cell (10).
- a pouch-shaped battery cell (10) may include a folding portion (130) in which an edge portion (120) of the first case (100A) wraps around an edge portion (120) of the second case (100B) so that a discharge path (140) is formed between the edge portion (120) of the first case (100A) and the edge portion (120) of the second case (100B).
- the edge (120) of the first case (100A) can be folded, bent, or curved to form a folded portion (130). More specifically, to form the folded portion (130), the edge (120) of the first case (100A) can be folded with a predetermined gap from the end of the edge (120) of the second case (100B).
- the folding portion (130) can extend in the direction of the full length or full width of the cup portion (110).
- the folding portion (130) may be provided in at least one, preferably in multiple numbers.
- the folding portion (130) may be formed on three sides of the four sides of the pouch-shaped battery cell (10) excluding the folding region (103).
- the multiple folding portions (130) may include a first folding portion (130A) extending in the full length direction of the cup portion (110) and a second folding portion (130B) extending in the full width direction of the cup portion (110).
- the present invention is not limited to this, and it is also possible for the folding portion (130) to be formed only on some of the third sides.
- the edge portion (120) of the first case (100A) may be formed wider than the edge portion (120) of the second case (100B).
- the edge portion (120) of the first case (100A) may be formed longer in the overall length and/or overall width direction than the edge portion (120) of the second case (100B).
- a first line (L1) and a second line (L2) are indicated at an edge (120) of a first case (100A) to exemplarily indicate lines corresponding to the ends of an edge (120) of a second case (100B).
- the first line (L1) may be parallel to the full-length direction of a pouch-shaped battery cell (10)
- the second line (L2) may be parallel to the full-width direction of a pouch-shaped battery cell (10).
- the corner portion where the first line (L1) and the second line (L2) overlap at the edge portion (120) of the first case (100A) can be double folded.
- the corner portion can be cut into an appropriate shape by a person skilled in the art.
- the folding portion (130) may include a first facing portion (131) facing one side of the edge portion (120) of the second case (100B), a second facing portion (132) facing the other side of the edge portion (120) of the second case (100B), and a connecting portion (133) connecting the first facing portion (131) and the second facing portion (132).
- the first facing portion (131) can be in contact with one surface of the edge portion (120) of the second case (100B).
- the second facing portion (132) can be in contact with the other surface of the edge portion (120) of the second case (100B).
- the connecting portion (133) can be folded, bent, or curved at a predetermined interval from the end of the edge portion (120) of the second case (100B). With the above configuration, a discharge path (140) can be formed within the connecting portion (133). When the internal pressure of the cup portion (110) increases, gas generated within the cup portion can be discharged to the outside of the pouch-type battery cell (10) by sequentially passing through the venting portion (160) described below and the discharge path (140).
- the cross-sectional shape of the exhaust path (140) may be defined by the shape of the connecting portion (133).
- the connecting portion (133) may include a curved surface formed to be convex toward the outside.
- a portion of the cross-section of the exhaust path (140) may be approximately rounded.
- the first facing portion (131) and the second facing portion (132) can overlap each other with respect to the thickness direction of the edge portion (120) of the second case (100B).
- the first facing portion (131) and the second facing portion (132) can be joined to the edge portion (120) of the second case (100B) by a sealing portion (150) to be described later.
- the thickness (t2) of the connection portion (133) in the direction parallel to the thickness of the edge portion (120) of the second case (100B) (upper and lower direction with reference to FIG. 3) may be greater than the sum (t1) of the thickness of the first facing portion (131), the thickness of the edge portion (120) of the second case (100B), and the thickness of the second facing portion (132). That is, the thickness (t2) of the connection portion (133) may be greater than the thickness of the sealing portion (150).
- the connection portion (133) may be formed to protrude further in the thickness direction than the first facing portion (131) and the second facing portion (132).
- the width (W) of the discharge path (140) in the direction parallel to the thickness of the edge (120) of the second case (100B) may be greater than the thickness (t0) of the edge (120) of the second case (100B).
- the cross-sectional area of the exhaust path (140) can be sufficiently large, and gas can be discharged smoothly through the exhaust path (140).
- the discharge path (140) extends in the direction of the full length or full width of the cup portion (110) and at least one end, preferably both ends, can be opened.
- the open end of the discharge path (140) can act as an outlet through which gas is discharged.
- the arrows shown in Fig. 2 schematically indicate gas discharged from the end of the discharge path (140) within each folded portion (130). Accordingly, there is no need to form a separate discharge port in the folded portion (130).
- the sealing portion (150) can be formed in the folding portion (130) and can be formed long along the folding portion (130).
- the sealing portion (150) can be formed in various ways.
- the sealing portion (150) can be formed by heat welding, laser welding, ultrasonic welding, or resistance welding.
- the sealing portion (150) can be located between the cup portion (110) and the discharge passage (140). Accordingly, the sealing portion (150) can partition the internal space of the cup portion (110) and the discharge passage (140).
- the sealing portion (150) may be formed by sealing the first facing portion (131) and the second facing portion (132) with the edge portion (120) of the second case (100B).
- the sealing portion (150) may include a first sealing portion (151) in which the edge portion (120) of the second case (100B) and the first facing portion (131) are sealed, and a second sealing portion (152) in which the edge portion (120) of the second case (100B) and the second facing portion (132) are sealed. That is, the sealing portion (150) may be doubly sealed to the folding portion (130) and may have a high sealing strength.
- the pouch-type battery cell (10) may include a venting portion (160) positioned between the cup portion (110) and the discharge passage (140).
- the venting portion (160) may be formed by sealing a portion of the folding portion (130) weaker than the sealing portion (150) so that when the internal pressure of the cup portion (110) increases, the weak seal is destroyed and the cup portion (110) and the discharge passage (140) are connected.
- the venting portion (160) may be unsealed. Therefore, in either case, the cup portion (110) may be selectively connected to the discharge passage (160).
- the venting portion (160) can be formed by slightly sealing the edge portion (120) of the first facing portion (131) and the second case (100B) to each other or leaving a specific area unsealed. That is, a part of the first sealing portion (151) can be unsealed or slightly sealed and defined as the venting portion (160).
- the venting portion (160) can overlap with the second sealing portion (152) in the thickness direction of the edge portion (120) of the second case (100B).
- the sealing strength of the venting portion (160) may be lower than the sealing strengths of the first sealing portion (151) and the second sealing portion (152).
- the gap between the first facing portion (131) and the edge portion (120) of the second case (100B) may widen, destroying the weak seal and causing a gap (g) to occur.
- the gas within the cup portion (110) may flow to the exhaust path (140) through the gap (g).
- the venting section (160) may be provided in at least one, or preferably in multiple, number along the perimeter of the first case (100A) and the second case (100B).
- Each folded portion (130) may be formed with at least one venting portion (160).
- the plurality of venting portions (160) may include a first venting portion (160A) positioned along a length side of the edge portion (120) and a second venting portion (160B) positioned along a width side of the edge portion (120).
- the first venting part (160A) can connect the discharge path (140) in the first folding part (130A) and the cup part (110), and the second venting part (160B) can connect the discharge path (140) in the second folding part (130B) and the cup part (110).
- venting portions (160) it is also possible for multiple venting portions (160) to be formed in a single folding portion (130).
- the pouch-type battery cell (10) has the advantage of being easy to design an appropriate flow rate at which gas is discharged within the cup portion (110) by adjusting the length, number, and position of the venting portion (160).
- Figure 5 is a drawing showing a modified example of the connection part shown in Figures 3 and 4.
- the connecting portion (133') according to the modified example can form a discharge path (140)'.
- the width of the discharge path (140') in a direction parallel to the thickness of the edge portion (120) of the second case (100B) (upper and lower direction based on FIG. 5) can be the same as or similar to the thickness (t0) of the edge portion (120) of the second case (100B).
- the width (W') of the exhaust path (140') in a direction parallel to the width of the edge portion (120) of the second case (100B) (horizontal direction based on FIG. 5) may be larger than the thickness (t0) of the edge portion (120) of the second case (100B).
- the width (W') of the exhaust path (140') may be at least twice the thickness (t0) of the edge portion (120) of the second case (100B).
- the connecting portion (133') can form a polygonal discharge path (140)' that does not include a curved surface. However, it is not limited thereto, and, as in the first embodiment, it is also possible for the connecting portion (133') to include a curved surface.
- FIG. 6 is a plan view of a pouch-shaped battery cell according to a second embodiment of the present invention
- FIG. 7 is a partial cross-sectional view taken along line C-C' of FIG. 6.
- a pouch-shaped battery cell (10a) may have a folding portion (130) formed on some of the three sides except for the folding area (103), and a sub-folding portion (170) formed on other sides.
- the sub-folding portion (170) can be provided so that the edge portion (120) of the first case (100A) wraps around the edge portion (120) of the second case (100B), thereby preventing the formation of a discharge path. That is, the sub-folding portion (170) can be folded, bent, or curved at a position where it comes into contact with or is adjacent to the end of the edge portion (120) of the second case (100B).
- the sub-folding portion (170) may include a first facing portion (171) facing one side of the edge portion (120) of the second case (100B), a second facing portion (172) facing the other side of the edge portion (120) of the second case (100B), and a connecting portion (173) connecting the first facing portion (171) and the second facing portion (172).
- the connecting portion (173) may be folded, bent, or curved so as to be in contact with or adjacent to an end of the edge portion (120) of the second case (100B).
- a sealing portion (150) may be formed in the sub-folding portion (170).
- the sealing portion (150) formed in the sub-folding portion (170) may be formed by sealing the first facing portion (171) and the second facing portion (172) with the edge portion (120) of the second case (100B).
- the sealing portion (150) may include a first sealing portion (151) in which the edge portion (120) of the second case (100B) and the first facing portion (171) are sealed, and a second sealing portion (152) in which the edge portion (120) of the second case (100B) and the second facing portion (172) are sealed. That is, the sealing portion (150) may be doubly sealed in the sub-folding portion (170) and may have a higher sealing strength.
- the sub-folding portion (170) can be formed compactly compared to the folding portion (130). Therefore, by forming the sub-folding portion (170) instead of the folding portion (130) in a portion where the formation of the discharge path (140) is unnecessary, the energy density of the pouch-type battery cell (10a) can be improved.
- Figure 8 is a plan view of a pouch-shaped battery cell according to the third embodiment of the present invention.
- the pouch-shaped battery cell (10b) according to the third embodiment can be manufactured by sealing the first case (100A) and the second case (100B), which are not connected as one body but are separate components.
- the edge portions (120) of the first case (100A) and the second case (100B) can be in contact with each other and can be sealed together later to form four sides of the pouch-shaped battery cell (10b). Accordingly, the sealing portion (150) can be formed on the four sides of the pouch-shaped battery cell (10b).
- the folding portion (130) may be formed on at least one of the four sides of the pouch-shaped battery cell (10).
- the folding portions (130) may be provided in a pair that are arranged on opposite sides with the cup portion (110) in between and are parallel to each other.
- the folding portions (130) may be formed on each of the four sides of the pouch-shaped battery cell (10).
- at least one venting portion (160) may be formed on each folding portion (130).
- FIG. 9 is a plan view of a pouch-shaped battery cell according to a fourth embodiment of the present invention
- FIG. 10 is a partial cross-sectional view taken along line D-D' of FIG. 9.
- the pouch-shaped battery cell (10c) may include a gas discharge member (180) provided in the folding member (130) and arranged between the cup member (110) and the discharge path (140).
- the gas discharge member (180) may replace the venting member (160) of the first embodiment described above.
- the gas discharge member (180) may be located between the cup portion (110) and the discharge path (140).
- the gas discharge member (180) may be located between the first facing portion (131) of the folding portion (130) and the edge portion (120) of the second case (100B).
- the gas discharge member (180) can overlap the second sealing member (152) in the thickness direction of the edge portion (120) of the second case (100B).
- the gas discharge member (180) may be formed of a material that is permeable to gas. Accordingly, when the internal pressure of the cup portion (110) increases, the gas within the cup portion (110) may be discharged to the discharge path (140) through the gas discharge member (180).
- the inner end of the gas discharge member (180) may be placed inside the cup portion (110).
- the outer end of the gas discharge member (180) may be placed inside the discharge path (140).
- the width of the gas discharge member (180) may be wider than the width of the sealing portion (150), particularly the second sealing portion (152). Accordingly, gas generated inside the cup portion (110) may be smoothly discharged to the discharge path (140) through the gas discharge member (180).
- the outer end of the gas discharge member (180) may protrude further than the end of the edge portion (120) of the second case (100B).
- gas passing through the gas discharge member (180) may be discharged not only in the width direction (horizontal direction in FIG. 10) of the gas discharge member (180) but also in the surface direction (vertical direction in FIG. 10). That is, the gas may be smoothly discharged into the discharge path (140).
- the length (L) of the gas discharge member (180) can be appropriately adjusted.
- the length of the gas discharge member (180) can mean a direction parallel to the length of the sealing portion (150).
- the gas discharge member (180) may be formed of a material having a higher melting point than the first resin layer (e.g., PP layer) forming the innermost layer of the case (100).
- the gas discharge member (180) may be formed of a material that does not react with the electrolyte.
- the gas discharge member (180) may include a binder including at least one of an olefin-based resin, an acrylic-based resin, and a fluorine-based resin.
- the olefin-based resin may be polypropylene (PP), polyethylene (PE), or polyvinyldifluoride (PVDF).
- the fluorine-based resin may be polytetrafluoroethylene (PTFE) or polyvinylidenefluoride.
- the internal pressure of the cup portion (110) can be maintained at an appropriate level, and there is an advantage in that continuous use of the pouch-type battery cell (10c) is possible.
- the gas discharge member (180) may further include a hygroscopic material to increase gas permeability while minimizing moisture penetration. That is, the gas discharge member (180) may include a getter material.
- the hygroscopic material may be calcium oxide (CaO), barium oxide (BaO), lithium chloride (LiCl), silica (SiO2), calcium (Ca), barium (Ba), etc., but is not limited thereto, and any material that reacts with water (H2O) may be used.
- the gas discharge member (180) may be in the form of a film. However, it is not limited thereto, and may be formed by coating a resin including the binder and/or absorbent material described above on at least one of the first facing portion (131) or the edge portion (120) of the second case (100B) by a known coating method.
- the bonding force of the gas discharge member (180) to the edge portion (120) of the first facing portion (131) and/or the second case (100B) may be smaller than the bonding force of the sealing portion (150), particularly the second sealing portion (152).
- the interface between the edge portion (120) of the first facing portion (131) and/or the second case (100B) and the gas discharge member (180) may be separated little by little. As a result, the amount of gas permeated through the gas discharge member (180) may increase.
- the interface between the edge portion (120) of the first facing portion (131) and/or the second case (100B) and the gas discharge member (180) can be completely separated, and a passage through which gas is discharged can be created, similar to the gap (g) of Fig. 4. This enables rapid discharge of gas, and the safety of the pouch-type battery cell (10c) can be improved.
- the gas discharge member (180) may be provided at least one, and preferably a plurality, along the periphery of the first case (100A) and the second case (100B).
- Each folding portion (130) may be provided with at least one gas discharge member (180).
- the plurality of gas discharge members (180) may include a first gas discharge member (180A) positioned along a length side of the edge portion (120) and a second gas discharge member (180B) positioned along a width side of the edge portion (120).
- gas passing through the first gas discharge member (180A) can be discharged through the discharge path (140) in the first folded portion (130A), and gas passing through the second gas discharge member (180B) can be discharged through the discharge path (140) in the second folded portion (130B).
- gas discharge members (180) it is also possible for multiple gas discharge members (180) to be formed in a single folding member (130). Meanwhile, it is also possible to replace the venting member (160) of the second and third embodiments described above with a gas discharge member (180).
- Second face 133 Connection
- Venting part 180 Gas exhaust part
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
Description
Claims (20)
- 제1케이스 및 제2케이스의 사이에 전극 조립체가 수용된 파우치형 전지셀에 있어서,상기 제1케이스 또는 제2케이스 중 적어도 하나에 형성되며 상기 전극 조립체를 수용하는 컵부;상기 제1케이스의 가장자리부와 상기 제2케이스의 가장자리부의 사이에 배출 유로가 형성되도록, 상기 제1케이스의 가장자리부가 상기 제2케이스의 가장자리부를 감싸는 접힘부;상기 접힘부에 형성되는 실링부; 및상기 컵부의 내압이 높아지면 상기 컵부와 상기 배출 유로를 연통시키는 벤팅부를 포함하는 파우치형 전지셀.
- 제 1 항에 있어서,상기 실링부 및 벤팅부는, 상기 컵부와 상기 배출 유로의 사이에 위치하는 파우치형 전지셀.
- 제 1 항에 있어서,상기 접힘부는,상기 제2케이스의 가장자리부의 일면을 마주보는 제1대면부;상기 제1대면부의 반대편에서 상기 제2케이스의 가장자리부의 타면을 마주보는 제2대면부; 및상기 제1대면부와 상기 제2대면부를 연결하고 상기 제2케이스의 가장자리부의 끝단과 소정의 간격을 이루며 벤딩되거나 휘어지는 연결부를 포함하고,상기 배출 유로는 상기 연결부에 의해 적어도 부분적으로 형성되는 파우치형 전지셀.
- 제 3 항에 있어서,상기 제2케이스의 가장자리부의 두께와 나란한 방향에 대한 상기 연결부의 두께는, 상기 제1대면부의 두께와, 상기 제2케이스의 가장자리부의 두께와, 상기 제2대면부의 두께의 합보다 큰 파우치형 전지셀.
- 제 3 항에 있어서,상기 제2케이스의 가장자리부의 두께와 나란한 방향에 대한 상기 배출 유로의 폭은, 상기 제2케이스의 가장자리부의 두께보다 큰 파우치형 전지셀.
- 제 3 항에 있어서,상기 연결부는 외측으로 볼록하게 형성된 곡면을 포함하는 파우치형 전지셀.
- 제 3 항에 있어서,상기 실링부는,상기 제1대면부가 상기 제2케이스의 가장자리부에 실링된 제1실링부; 및상기 제2대면부가 상기 제2케이스의 가장자리부에 실링된 제2실링부를 포함하는 파우치형 전지셀.
- 제 3 항에 있어서,상기 벤팅부는,상기 제1대면부 및 상기 제2케이스의 가장자리부가 서로 미실링 또는 약실링되어 형성되는 파우치형 전지셀.
- 제 1 항에 있어서,상기 배출 유로는,상기 컵부의 전장 또는 전폭 방향으로 연장되며 적어도 일 단부가 개방되는 파우치형 전지셀.
- 제 1 항에 있어서,상기 벤팅부는, 상기 제1케이스 및 제2케이스의 둘레를 따라 복수개가 구비된 파우치형 전지셀.
- 제 1 항에 있어서,상기 접힘부 및 벤팅부는 복수개가 구비되고,상기 복수개의 접힘부는,상기 컵부의 전장 방향으로 연장되는 제1접힘부; 및상기 컵부의 전폭 방향으로 연장되는 제2접힘부를 포함하고,상기 복수개의 벤팅부는,제1접힘부에 위치하는 제1벤팅부; 및제2접힘부에 위치하는 제2벤팅부를 포함하는 파우치형 전지셀.
- 제1케이스 및 제2케이스의 사이에 전극 조립체가 수용된 파우치형 전지셀에 있어서,상기 제1케이스 또는 제2케이스 중 적어도 하나에 형성되며 상기 전극 조립체를 수용하는 컵부;상기 제1케이스의 가장자리부와 상기 제2케이스의 가장자리부의 사이에 배출 유로가 형성되도록, 상기 제1케이스의 가장자리부가 상기 제2케이스의 가장자리부를 감싸는 접힘부;상기 접힘부에 형성되는 실링부; 및상기 컵부와 상기 배출 유로의 사이에 배치되며, 가스 투과성이 있는 재질로 형성된 가스 배출 부재를 포함하는 파우치형 전지셀.
- 제 12 항에 있어서,상기 가스 투과성이 있는 재질은 흡습 물질을 포함하는 파우치형 전지셀.
- 제 12 항에 있어서,상기 가스 배출 부재의 내측 단부는 적어도 일부가 상기 컵부의 내부에 위치하는 파우치형 전지셀.
- 제 12 항에 있어서,상기 가스 배출 부재의 외측 단부는 적어도 일부가 상기 배출 유로의 내부에 위치하는 파우치형 전지셀.
- 제 12 항에 있어서,상기 가스 배출 부재의 외측 단부는, 상기 제2케이스의 가장자리부의 단부보다 더 돌출되는 파우치형 전지셀.
- 제 12 항에 있어서,상기 접힘부는,상기 제2케이스의 가장자리부의 일면을 마주보는 제1대면부;상기 제2케이스의 가장자리부의 타면을 마주보는 제2대면부; 및상기 제1대면부와 상기 제2대면부를 연결하고 상기 제2케이스의 가장자리부의 끝단과 소정의 간격을 이루며 벤딩되거나 휘어지는 연결부를 포함하고,상기 배출 유로는 상기 연결부에 의해 적어도 부분적으로 형성되는 파우치형 전지셀.
- 제 17 항에 있어서,상기 가스 배출 부재는, 상기 제1대면부와 상기 제2케이스의 가장자리부의 사이에 위치하는 파우치형 전지셀.
- 제 12 항에 있어서,상기 가스 배출 부재는, 상기 제1케이스 및 제2케이스의 둘레를 따라 복수개가 구비된 파우치형 전지셀.
- 제 1 항에 있어서,상기 접힘부는 서브 접힘부를 포함하고,상기 서브 접힘부의 연결부는 상기 제2케이스의 가장자리부의 끝단과 접촉되거나 인접하는 파우치형 전지셀.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202480013337.8A CN120712682A (zh) | 2023-04-12 | 2024-02-13 | 袋型电池单元 |
| EP24788884.5A EP4648202A4 (en) | 2023-04-12 | 2024-02-13 | POUCH TYPE BATTERY CELL |
| JP2025549778A JP2026508280A (ja) | 2023-04-12 | 2024-02-13 | パウチ型電池セル |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20230048247 | 2023-04-12 | ||
| KR10-2023-0048247 | 2023-04-12 | ||
| KR1020230067111A KR102894214B1 (ko) | 2023-04-12 | 2023-05-24 | 파우치형 전지셀 |
| KR10-2023-0067111 | 2023-05-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024214940A1 true WO2024214940A1 (ko) | 2024-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2024/002017 Ceased WO2024214940A1 (ko) | 2023-04-12 | 2024-02-13 | 파우치형 전지셀 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20240347847A1 (ko) |
| EP (1) | EP4648202A4 (ko) |
| JP (1) | JP2026508280A (ko) |
| CN (1) | CN120712682A (ko) |
| WO (1) | WO2024214940A1 (ko) |
Citations (5)
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| JP2011108433A (ja) * | 2009-11-16 | 2011-06-02 | Sumitomo Heavy Ind Ltd | 蓄電装置 |
| KR20110072733A (ko) * | 2009-12-23 | 2011-06-29 | 삼성에스디아이 주식회사 | 이차 전지 및 이차 전지의 제조방법 |
| KR20190054735A (ko) * | 2017-11-14 | 2019-05-22 | 삼성에스디아이 주식회사 | 미실링부를 갖는 파우치 타입 이차 전지 |
| KR20220043034A (ko) * | 2020-09-28 | 2022-04-05 | 주식회사 엘지에너지솔루션 | 이차전지 및 그의 제조방법 |
| KR20220121748A (ko) * | 2021-02-25 | 2022-09-01 | 주식회사 엘지에너지솔루션 | 전지셀, 이의 제조 방법 및 이를 포함하는 전지 모듈 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040048295A (ko) * | 2002-12-02 | 2004-06-07 | 히다치 막셀 가부시키가이샤 | 전지 |
| US8574746B2 (en) * | 2008-03-14 | 2013-11-05 | Nec Corporation | Film-covered electrical device and assembled battery |
| KR20220142962A (ko) * | 2021-04-15 | 2022-10-24 | 주식회사 엘지에너지솔루션 | 이차전지 |
| KR102951440B1 (ko) * | 2021-06-02 | 2026-04-10 | 주식회사 엘지에너지솔루션 | 실링부 벤팅 조절 수단을 포함하는 파우치형 전지셀 |
| US20240106070A1 (en) * | 2021-07-06 | 2024-03-28 | Lg Energy Solution, Ltd. | Battery Cell And Battery Module Comprising Same |
-
2024
- 2024-02-13 EP EP24788884.5A patent/EP4648202A4/en active Pending
- 2024-02-13 CN CN202480013337.8A patent/CN120712682A/zh active Pending
- 2024-02-13 JP JP2025549778A patent/JP2026508280A/ja active Pending
- 2024-02-13 WO PCT/KR2024/002017 patent/WO2024214940A1/ko not_active Ceased
- 2024-03-06 US US18/597,586 patent/US20240347847A1/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011108433A (ja) * | 2009-11-16 | 2011-06-02 | Sumitomo Heavy Ind Ltd | 蓄電装置 |
| KR20110072733A (ko) * | 2009-12-23 | 2011-06-29 | 삼성에스디아이 주식회사 | 이차 전지 및 이차 전지의 제조방법 |
| KR20190054735A (ko) * | 2017-11-14 | 2019-05-22 | 삼성에스디아이 주식회사 | 미실링부를 갖는 파우치 타입 이차 전지 |
| KR20220043034A (ko) * | 2020-09-28 | 2022-04-05 | 주식회사 엘지에너지솔루션 | 이차전지 및 그의 제조방법 |
| KR20220121748A (ko) * | 2021-02-25 | 2022-09-01 | 주식회사 엘지에너지솔루션 | 전지셀, 이의 제조 방법 및 이를 포함하는 전지 모듈 |
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| Title |
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| See also references of EP4648202A4 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20240347847A1 (en) | 2024-10-17 |
| CN120712682A (zh) | 2025-09-26 |
| EP4648202A4 (en) | 2026-04-29 |
| JP2026508280A (ja) | 2026-03-10 |
| EP4648202A1 (en) | 2025-11-12 |
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