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KR-102962554-B1 - Battery cell Assembly

KR102962554B1KR 102962554 B1KR102962554 B1KR 102962554B1KR-102962554-B1

Abstract

A battery cell assembly according to one embodiment of the present invention comprises at least one battery cell having a tab sealing portion and an electrode tab formed at one or both ends, and a pair of venting pressure portions formed to face the tab sealing portion so as to rotate around a coupling axis by the expansion force of one side of the tab sealing portion and press the other side of the tab sealing portion. According to one embodiment of the present invention, the rupture of the fused portion of the battery cell sealing portion can be effectively sensed and pressurized by the pressure caused by the discharge of gas inside the battery cell, thereby enabling detection and delay.

Inventors

  • 김동진
  • 이승훈

Assignees

  • 에스케이온 주식회사

Dates

Publication Date
20260508
Application Date
20211223

Claims (11)

  1. At least one battery cell having a tab sealing portion and an electrode tab formed at one or both ends; and It includes a pair of venting pressure members formed to face the tap sealing member so as to rotate around a coupling axis by the expansion force on one side of the tap sealing member and press the other side of the tap sealing member. The above venting pressure part A variable part that transmits rotational force to the coupling shaft by being driven by the expansion force of the above-mentioned tab sealing part; and A pressurizing member that pressurizes the tap sealing member by mutually contacting both sides of the tap sealing member by the rotational force of the above coupling shaft; A battery cell assembly comprising a pressure sensor that senses the intensity of pressure applied to both sides of the tab sealing part through the above-mentioned pressurizing part to sense the degree of breakage or the time of breakage of the tab sealing part.
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  4. In claim 1, Using the above coupling shaft as a rotation axis, A battery cell assembly in which the above variable part and the above pressure part are integrally formed.
  5. At least one battery cell having a tab sealing portion and an electrode tab formed at one or both ends; and It includes a pair of venting pressure members formed to face the tap sealing member so as to rotate around a coupling axis by the expansion force on one side of the tap sealing member and press the other side of the tap sealing member. The above tab sealing part A tab terrace including an internal space where the outer material of the above battery cell is not adhered; and It includes a tab fusion portion formed by bonding the above exterior material, A battery cell assembly comprising a pair of venting pressure members formed to face the tab sealing member so as to rotate around a coupling axis by the expansion force of one side of the tab sealing member and press the tab fusion member on the other side of the tab sealing member.
  6. In claim 5, When the above-mentioned fused tab begins to fracture due to internal expansion force, A battery cell assembly formed such that the above-mentioned venting pressure portion pressurizes the above-mentioned tab fusion portion by the expansion force of one side of the above-mentioned tab sealing portion.
  7. At least one battery cell having a tab sealing portion and an electrode tab formed at one or both ends; A venting detection part formed to face each other on each side of the tab sealing part, corresponding to each other, so as to be variable by the expansion force of the tab sealing part, and A battery cell assembly comprising a sensing sensor unit coupled to detect the degree to which the spacing distance of the venting detection unit is physically deformed by the expansion force of the tab sealing unit.
  8. At least one battery cell having a tab sealing portion and an electrode tab formed at one or both ends; A venting detection part formed to face each other on each side of the tab sealing part, corresponding to each other, so as to be variable by the expansion force of the tab sealing part, and It includes a sensing sensor unit coupled to detect the separation distance of the above-mentioned venting detection unit, and The above venting detection unit A first venting detection part formed on one surface of the above-mentioned tab sealing part; and A second venting detection part formed on the other side of the above-mentioned tab sealing part and facing the first venting detection part; is included. The above-mentioned sensing unit is disposed in an area where the tab sealing unit is not formed among the areas facing the first venting sensing unit and the second venting sensing unit, and is a battery cell assembly coupled with the first venting sensing unit and the second venting sensing unit.
  9. At least one battery cell having a tab sealing portion and an electrode tab formed at one or both ends; A variable part that varies by the expansion force of the above-mentioned tab sealing part; A fixed part coupled to the above variable part; and A battery cell assembly comprising a sensing sensor unit coupled to connect the variable part and the fixed part, sensing a change in the distance between the fixed part and the variable part, and sensing the degree of expansion of the tab sealing part and the degree of venting of the gas inside the battery cell due to the expansion of the tab sealing part.
  10. At least one battery cell having a tab sealing portion and an electrode tab formed at one or both ends; A variable part that varies by the expansion force of the above-mentioned tab sealing part; A fixed part coupled to the above variable part; and It includes a sensing sensor unit coupled to connect the variable part and the fixed part, and detecting deformation of the variable part. The above fixed part is formed by extending from the coupling axis of one end of the above variable part, and is a battery cell assembly that rotates and deforms around the coupling axis.
  11. At least one battery cell having a tab sealing portion and an electrode tab formed at one or both ends; A variable part that varies by the expansion force of the above-mentioned tab sealing part; A fixed part coupled to the above variable part; and It includes a sensing sensor unit coupled to connect the variable part and the fixed part, and detecting deformation of the variable part. The above fixed part Formed spaced apart in the outer direction of the above variable part, A battery cell assembly in which the above-described sensing sensor part is coupled to the space between the fixed part and the variable part, and detects a change in the distance from the fixed part due to deformation of the variable part.

Description

Battery cell assembly One embodiment of the present invention relates to a battery cell assembly. Generally, a secondary battery is a battery that can be used repeatedly through the discharge process, which converts chemical energy into electrical energy, and the reverse charging process. Its types include nickel-cadmium (Ni-Cd) batteries, nickel-hydrogen (Ni-MH) batteries, lithium-metal batteries, lithium-ion (Ni-Ion) batteries, and lithium-ion polymer batteries (Li-Ion Polymer Battery, hereinafter referred to as "LIPB"). A secondary battery consists of a positive electrode, a negative electrode, an electrolyte, and a separator, and stores and generates electricity by utilizing the voltage difference between different positive and negative electrode materials. Here, discharge refers to the movement of electrons from the negative electrode, which has a higher voltage, to the positive electrode, which has a lower voltage (generating electricity equal to the voltage difference between the positive and negative electrodes), and charging refers to the movement of electrons back from the positive electrode to the negative electrode; at this time, the positive electrode material accepts electrons and lithium ions and returns to its original metal oxide form. In other words, when a secondary battery is charged, a charging current flows as metal atoms move from the positive electrode to the negative electrode through the separator, and conversely, when it is discharged, a discharge current flows as metal atoms move from the negative electrode to the positive electrode. Recently, secondary batteries have garnered attention as a promising energy source due to their widespread use in IT products, the automotive sector, and energy storage. In the IT product sector, secondary batteries are required to enable long-term continuous use, as well as to be miniaturized and lightweight. In the automotive sector, high output, durability, and safety to eliminate the risk of explosion are required. The energy storage sector involves storing surplus electricity generated from sources such as wind and solar power; as these are used in a stationary manner, secondary batteries with more relaxed conditions can be applied. As gas is generated inside the battery cell, this gas pressure is transmitted to the outside, causing the terrace portion to swell and eventually leading to the fracture of the fused portion of the sealing portion. Consequently, there was a problem of exposure to explosions or various electrical hazards caused by the venting of this gas. FIG. 1 is a perspective view of a battery cell according to an embodiment of the present invention. FIG. 2 is a partial enlarged view of FIG. 1. FIG. 3 is a schematic diagram of the operation of a battery cell assembly according to a first embodiment of the present invention. FIG. 4A is a schematic diagram of the operation of a battery cell assembly according to a second embodiment of the present invention. FIG. 4B is a combined plan view of the tab sealing part and the venting detection part of FIG. 4A. FIGS. 5A and 5B are schematic diagrams of the operation of a battery cell assembly according to a modified example of the second embodiment of the present invention. FIG. 6 is a schematic diagram of the operation of a battery cell assembly according to another variation of the second embodiment of the present invention. The object, specific advantages, and novel features of the invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings. It should be noted that in assigning reference numbers to the components of each drawing in this specification, the same components are assigned the same number whenever possible, even if they are shown in different drawings. Furthermore, terms such as "one side," "other side," "first," and "second" are used to distinguish one component from another, and the components are not limited by these terms. In the following description of the invention, detailed descriptions of related prior art that could unnecessarily obscure the essence of the invention are omitted. Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings, and the same reference numerals indicate the same components. FIG. 1 is a perspective view of a battery cell (10) according to an embodiment of the present invention, and FIG. 2 is a partial enlarged view of FIG. 1. A battery cell assembly according to one embodiment of the present invention comprises at least one battery cell (10) having an electrode tab (11) formed at one or both ends and a pair of venting pressure parts (20) formed to face the electrode tab (11) so as to rotate around a coupling axis (23) by the expansion force of one side of the electrode tab (11) to press the other side of the electrode tab (11). As illustrated in FIGS. 1 and 2, a battery cell (10) according to an e