KR-102963289-B1 - Pouch-type Battery Cell

KR102963289B1KR 102963289 B1KR102963289 B1KR 102963289B1KR-102963289-B1

Abstract

An electrode assembly (130) formed by stacking a plurality of positive plates (131) and negative plates (133) with a separator (135) in between; a pouch (101) having an electrode receiving portion (110) for accommodating the electrode assembly inside, and a sealing portion (120) for sealing the electrode assembly on at least a portion of the perimeter of the electrode receiving portion; The present invention provides a pouch-type battery cell (100) comprising: an electrode lead (140) that is electrically connected to the electrode assembly and includes a positive lead and a negative lead that are exposed to the outside of the pouch through the sealing portion; wherein the electrode receiving portion (110) includes a body portion (111) having a width greater than its height and an extension portion (115) that extends to one side from the center portion in the width direction of the body portion and has a width smaller than that of the body portion, and the electrode lead (140) is located on the outer side in the width direction of the extension portion (115), and the end of the electrode lead (140) has a height lower than the outer edge of the pouch (101).

Inventors

최양규
이서로
최영선
최은정

Assignees

에스케이온 주식회사

Dates

Publication Date: 20260511
Application Date: 20201113

Claims (16)

An electrode assembly formed by stacking multiple positive and negative plates with a separator in between; A pouch having an electrode receiving portion for accommodating the electrode assembly inside, and a sealing portion for sealing the electrode assembly on at least a portion of the perimeter of the electrode receiving portion; and An electrode lead comprising a positive lead and a negative lead that are electrically connected to the electrode assembly and exposed to the outside of the pouch through the sealing portion; Includes, The electrode receiving portion comprises a body portion having a width greater than its height, and an extension portion extending to one side from the center of the width direction of the body portion and having a width smaller than that of the body portion. The above electrode lead is located on the outer side in the width direction of the extension, and The above sealing portion includes a first sealing portion formed on both sides in the width direction of the electrode receiving portion and a second sealing portion formed on the upper part of the electrode receiving portion. The above second sealing portion is a pouch-type battery cell formed on both sides and the top of the extension portion in the width direction, and on the top of the portion located on both sides in the width direction of the extension portion among the body portions.
In paragraph 1, A pouch-type battery cell in which the end of the electrode lead has a height lower than the outer edge of the pouch.
delete
In paragraph 1, The above pouch is formed by forming a single pouch film outer material so that a pair of electrode receiving portions are connected at a certain distance, and The above pair of electrode receiving portions have a shape in which the connected portions are folded so as to face each other, and the sealing portion is formed at the portions that meet each other around the perimeter of the electrode receiving portions. A pouch-type battery cell in which the sealing portion is not formed in the folded portion around the electrode receiving portion.
In any one of paragraphs 1, 2, and 4, The first sealing portion includes a first bent portion that is bent at least once, and The above second sealing portion is a pouch-type battery cell comprising a second fold portion that is folded at least once on the upper part of the extension portion.
In paragraph 5, A pouch-type battery cell in which the end of the electrode lead has a height lower than the outer height of the second bend portion.
In paragraph 5, The above second sealing portion is a pouch-type battery cell in which a step is formed between a portion formed on the upper part of the body portion and a portion formed on the upper part of the extension portion.
In Paragraph 7, The above electrode lead is a pouch-type battery cell that is exposed to the outside of the pouch through the second sealing portion formed on the upper part of the body portion.
In paragraph 5, A pouch-type battery cell having at least one of the first bend portion and the second bend portion having a shape that is bent twice.
An electrode assembly formed by stacking multiple positive and negative plates with a separator in between; A pouch having an electrode receiving portion for accommodating the electrode assembly inside, and a sealing portion for sealing the electrode assembly on at least a portion of the perimeter of the electrode receiving portion; and An electrode lead comprising a positive lead and a negative lead that are electrically connected to the electrode assembly and exposed to the outside of the pouch through the sealing portion; Includes, The electrode receiving portion comprises a body portion having a width greater than its height, and an extension portion extending to one side from the center of the width direction of the body portion and having a width smaller than that of the body portion. The above electrode lead is located on the outer side in the width direction of the extension, and A pouch-type battery cell in which the width of the electrode receiving portion is at least twice the size of the height of the electrode receiving portion.
An electrode assembly formed by stacking multiple positive and negative plates with a separator in between; A pouch having an electrode receiving portion for accommodating the electrode assembly inside, and a sealing portion for sealing the electrode assembly on at least a portion of the perimeter of the electrode receiving portion; and An electrode lead comprising a positive lead and a negative lead that are electrically connected to the electrode assembly and exposed to the outside of the pouch through the sealing portion; In a battery cell comprising, The electrode receiving portion comprises a body portion having a width greater than its height, and an extension portion extending to one side from the center of the width direction of the body portion and having a width smaller than that of the body portion. The above electrode lead is located on the outer side in the width direction of the extension, and A pouch-type battery cell having a width that is at least twice the height of the battery cell.
In any one of paragraphs 1, 10, and 11, A pouch-type battery cell having a width of 20 mm or more and a size of 1/3 or less of the width of the battery cell.
In any one of paragraphs 1, 10, and 11, A pouch-type battery cell having a thickness of the electrode lead ranging from 0.15 mm or more to 1 mm or less.
In any one of paragraphs 1, 10, and 11, A pouch-type battery cell in which the widthwise distance from one end of the battery cell to the extension has a value equal to or smaller than the total height of the battery cell.
An electrode assembly formed by stacking multiple positive and negative plates with a separator in between; A pouch having an electrode receiving portion for accommodating the electrode assembly inside, and a sealing portion for sealing the electrode assembly on at least a portion of the perimeter of the electrode receiving portion; and An electrode lead comprising a positive lead and a negative lead that are electrically connected to the electrode assembly and exposed to the outside of the pouch through the sealing portion; Includes, The electrode receiving portion comprises a body portion having a width greater than its height, and an extension portion extending to one side from the center of the width direction of the body portion and having a width smaller than that of the body portion. The above electrode lead is located on the outer side in the width direction of the extension, and The anode plate, the cathode plate, and the separator are each formed in a sheet shape and are stacked together to form the electrode assembly. The above positive plate includes a positive tab that protrudes upward from the upper side of one side in the width direction and is connected to the above positive lead on one side, A pouch-type battery cell comprising a negative plate that protrudes upward from the upper side of the other side in the width direction and includes a negative tab connected to the negative lead of the other side.
In paragraph 15, The above-mentioned anode plate includes an anode plate body portion having a width greater than its height, and an anode tab extending to one side from the center in the width direction of the anode plate body portion and having a width smaller than that of the anode plate body portion. A pouch-type battery cell comprising a negative plate having a width greater than its height, a negative plate body portion, and a negative tab extending to one side from the center portion in the width direction of the negative plate body portion and having a width smaller than that of the negative plate body portion.

Description

Pouch-type Battery Cell The present invention relates to a pouch-type battery cell for a secondary battery having an electrode assembly inside a pouch, and a battery module having the same. Unlike primary batteries, secondary batteries can be charged and discharged, so they can be applied in various fields such as digital cameras, mobile phones, laptops, hybrid cars, and electric vehicles. Examples of secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-hydrogen batteries, and lithium secondary batteries. Among these secondary batteries, extensive research is currently underway on lithium secondary batteries, which possess high energy density and discharge voltage. Recently, lithium secondary batteries have been manufactured as flexible pouch-type cells or rigid prismatic or cylindrical can-type cells, and multiple battery cells are electrically connected for use. In this process, multiple battery cells form a stacked cell array, which is placed inside a module housing to form a battery module. FIG. 1 is an exploded perspective view illustrating an example of a battery module (20) having a pouch-type battery cell (10) according to the prior art, FIG. 2 is a perspective view of the pouch-type battery cell (10) shown in FIG. 1, and FIG. 3 is a schematic diagram of the pouch-type battery cell (10) shown in FIG. 2. Referring to FIG. 1, a battery module (20) according to the prior art, which has pouch-type battery cells (10), is arranged such that a plurality of pouch-type battery cells (10) are stacked inside a module housing (21, 25). The module housing (21, 25) may include a bottom plate (21) having a shape in which one side (e.g., the upper side) is open, composed of a bottom portion (22) and a side wall portion (23), and a cover plate (25) that covers the open side of the bottom plate (21). Such module housing (21, 25) may have a tubular shape with both ends open, and the open ends may have a structure in which they are covered by end plates (26). A busbar assembly (30) may be provided between the end plate (26) and the stack of battery cells (10). The busbar assembly (30) may be equipped with a busbar (not shown) to which the electrode lead (15) is electrically connected, and a connection terminal (32) electrically connected to the busbar and for electrical connection with the outside. Additionally, an opening (27) may be formed in the end plate (26) to expose the connection terminal (32) to the outside. Referring to FIGS. 2 and 3, a conventional pouch-type battery cell (10) may include an electrode assembly (not shown) comprising a positive plate, a negative plate, and a separator, and a pouch (outer material) (11) that surrounds the electrode assembly. The pouch (11) is composed of an electrode receiving portion (12) that forms a portion for receiving the electrode assembly, and a sealing portion (13; 13a, 13b) formed by joining the periphery of the pouch (11) along the circumference of the electrode assembly. Additionally, the pouch-type battery cell (10) has a shape that includes electrode leads (15) that are connected to the electrode plates (positive plate, negative plate) of the electrode assembly and protrude outward from the pouch (12) at both ends in the width direction (length direction) (left and right direction in FIG. 3) of the battery cell (10), and an insulating part (15a) that can increase the sealing degree of the pouch (11) and simultaneously secure an electrical insulation state at the position where the electrode leads (15) are drawn out among the sealing parts (13a, 13b). As illustrated in FIGS. 2 and 3, a pouch-type battery cell (10) according to the prior art has a structure in which a sealing portion (13a) is formed at both ends (both sides) in the width direction (length direction) and an electrode lead (15) extends outside the sealing portion (13a). Therefore, the width (length) (L1) of the area (A') where the electrode plates (positive plate and negative plate) of the electrode assembly are installed has only a portion of the total width (length) (L) of the battery cell (10). That is, in the pouch-type battery cell (10) according to the prior art, the electrode plates are not formed at each end of the battery cell by a width (L2) equal to the sum of the width (L3) of the sealing portion (13a) and the protruding length (L4) of the electrode lead (15). In this way, in the case of a pouch-type battery cell (10), the width (length) (L2) of the area where the electrode plate is not formed in the exposed part of the electrode lead (15) is approximately 20 mm. Considering that the electrode lead (15) connected to the positive plate and the negative plate, respectively, is placed on both sides of the battery cell (10), the pouch-type battery cell (10) according to the prior art does not have an electrode plate installed in a width (length) of approximately 40 mm out of the total width (length) (L) of the battery cell (10). In particular, the pouch