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CN-122003772-A - Battery module in which exhaust gas is guided upward

CN122003772ACN 122003772 ACN122003772 ACN 122003772ACN-122003772-A

Abstract

A structure of a battery cell including a pouch accommodating an electrode assembly, an electrode lead extending from the electrode assembly and protruding to one side of the pouch in a length direction, and a shielding member disposed at one side of the pouch in the length direction, the shielding member having a through-hole through which the electrode lead passes and including a flame retardant material, wherein an inner circumferential surface of the through-hole corresponds to an outer circumferential surface of the electrode lead, and a structure of a battery module including at least one battery cell are provided.

Inventors

  • Zheng Qizhai

Assignees

  • 株式会社LG新能源

Dates

Publication Date
20260508
Application Date
20241011
Priority Date
20231013

Claims (20)

  1. 1. A battery cell, the battery cell comprising: a pouch accommodating the electrode assembly; an electrode lead extending from the electrode assembly and protruding from a first lengthwise end of the pouch; a housing accommodating the cell laminate and having a vent hole in an upper portion thereof, and A shielding member including a flame retardant material, the shielding member being disposed at the first lengthwise end of the pouch and including a through hole through which the electrode lead passes, and Wherein the inner circumferential surface of the through hole corresponds to the outer circumferential surface of the electrode lead.
  2. 2. The battery cell of claim 1, wherein the electrode leads and the through holes have the same height.
  3. 3. The battery cell of claim 1, wherein the electrode lead and the through hole have the same width.
  4. 4. The battery cell according to claim 1, wherein the outer circumferential surface of the electrode lead and the inner circumferential surface of the through-hole are in contact with each other.
  5. 5. The battery cell according to claim 1, wherein a gap between the outer peripheral surface of the electrode lead and the inner peripheral surface of the through-hole is sealed.
  6. 6. The battery cell according to claim 1, wherein a gap between the outer peripheral surface of the electrode lead and the inner peripheral surface of the through-hole is 1mm or less in all directions.
  7. 7. The battery cell of claim 1, wherein the first lengthwise end of the pouch is spaced a predetermined distance from the shielding member.
  8. 8. The battery cell of claim 1, wherein the shielding member includes a pair of sidewall portions extending from both widthwise ends of the shielding member toward the second length direction of the pouch.
  9. 9. The battery cell of claim 1, wherein the width of the shielding member is equal to or greater than the width of the battery cell.
  10. 10. The battery cell according to claim 1, wherein the lower end portion of the shielding member is located at the same height as or lower than the lower end portion of the first lengthwise end face of the battery cell.
  11. 11. The battery cell according to claim 1, wherein the upper end portion of the shielding member is located at the same height as or higher than the upper end portion of the first lengthwise end face of the battery cell.
  12. 12. The battery cell according to claim 1, wherein the shielding member covers the entire first lengthwise end face of the battery cell except the electrode leads when viewed from the first lengthwise end of the battery cell.
  13. 13. A battery module comprising the battery cell according to any one of claims 1 to 12.
  14. 14. A battery module, the battery module comprising: A cell laminate including a plurality of cell groups stacked in a width direction thereof, each cell group including a plurality of pouch-type battery cells, each of the plurality of pouch-type battery cells including a pouch accommodating an electrode assembly and an electrode lead extending from the electrode assembly and protruding from a first lengthwise end of the pouch; a housing accommodating the cell laminate and having a vent hole at an upper portion thereof, and A shielding member including a flame retardant material, the shielding member being disposed at a first lengthwise end of each of the plurality of cell groups and including a through hole through which the electrode lead passes, Wherein the inner circumferential surface of the through hole corresponds to the outer circumferential surface of the electrode lead.
  15. 15. The battery module of claim 14, wherein a gap in a width direction between two shield members adjacent in the width direction is 1 mm or less.
  16. 16. The battery module according to claim 15, wherein a gap between widthwise ends of at least one pair of shielding members facing each other is sealed.
  17. 17. The battery module according to claim 14, wherein the shielding member includes a pair of side wall portions extending from both widthwise ends of the shielding member toward the second lengthwise end of the pouch, and Two side wall portions of two shield members adjacent in the width direction are in contact with each other.
  18. 18. The battery module according to claim 14, wherein the shielding member includes a pair of side wall portions extending from both widthwise ends of the shielding member toward the second lengthwise end of the pouch, and A blocking member contacting at least one of the pair of side wall portions is interposed between at least two cell groups adjacent in the width direction.
  19. 19. The battery module of claim 14, further comprising a battery frame housing the cell laminate, the battery frame including a pair of side walls extending in a length direction from both widthwise ends of the cell laminate, Wherein the shielding member includes a pair of side wall portions extending from both widthwise ends of the shielding member toward the second lengthwise end of the bag, and At least one of the pair of side wall parts is in contact with the battery frame.
  20. 20. A battery pack comprising the battery module according to any one of claims 14 to 19.

Description

Battery module in which exhaust gas is guided upward Technical Field The present application claims the benefit of priority based on korean patent application No. 10-2023-0137405 filed on day 13 of 10 in 2023, the entire contents of which are incorporated herein by reference as part of the specification. The present invention relates to a battery module having a cell laminate in which a plurality of pouch-shaped battery cells capable of guiding the discharge of gas and flame in an upward direction are laminated, thereby preventing the discharge occurring in a forward direction at a cell stack level. Background Secondary batteries, which provide ease of use and have electrical characteristics such as high energy density according to product categories, are widely applied not only to portable devices but also to electric vehicles or hybrid vehicles driven by electric driving sources and electric power storage devices. These secondary batteries are attracting attention as new energy sources for improving the eco-friendliness and energy efficiency not only because they have a major advantage of being able to significantly reduce the use of fossil fuels, but also because they do not generate any by-products due to the use of energy. Although small-sized mobile devices use one or two or three battery cells per device, medium-to-large-sized devices such as vehicles require high output and large capacity. Therefore, a middle-to-large-sized battery module in which a plurality of battery cells are electrically connected is used. Since the middle-to-large-sized battery module needs to be manufactured in a manner as small and light as possible, rectangular batteries and pouch-shaped batteries, which can be stacked highly integrally and have a small weight-to-capacity ratio, are mainly used as battery cells of the middle-to-large-sized battery module. Fig. 1 shows the structure of a pouch-type battery cell. Referring to fig. 1, a general pouch-type battery cell 100 has a structure in which an electrode assembly 100 is received in a pouch 102. The pouch 102 accommodates the electrode assembly 100 by folding and sealing a sheet in half, and the pouch 102 is fused and sealed at a sealing portion 103 on one height end portion thereof and a landing portion 104 on both length direction end portions thereof. Electrode leads 105 extending from the electrode assembly 100 protrude from the pouch 102 through the stepped portion 104. Multiple battery cells 100 may be laminated to form a cell laminate for higher voltages and/or higher capacities. Fig. 2 shows a configuration of a cell laminate. Referring to fig. 2, a plurality of battery cells 100 may be laminated in a width direction to form a cell laminate 1. The cell laminate 1 may further include a blocking member 110 interposed between the battery cells 100 to prevent heat propagation between the battery cells 100. The battery cells 100 may be integrated to form one or more cell groups 10 that are isolated by a blocking member 110. The cell laminate 1 may be electrically connected to form a single module. Fig. 3 and 4 illustrate the structure of a general battery module. Referring to fig. 3 and 4, the battery module M may include a bus bar frame assembly 2 connected to the front of the cell laminate 1 to electrically connect the battery cells 100 to each other, and a case 4 accommodating the cell laminate 1. Meanwhile, thermal runaway may occur in the battery cell 100 due to a short circuit or an impact. When the fusion portion of the sealing portion 103 and the landing portion 104 is melted, high-temperature gas and flame generated during thermal runaway can be discharged through the upper, front and rear portions of the battery cell 100. Here, an exhaust hole 420 may be provided in the top plate 42 of the housing 4 to exhaust gas and flame out of the housing 4. However, when the gas and flame are discharged through the front of the battery module M, heat may be transferred to other battery modules or external devices electrically connected to the battery module M. In particular, when a plurality of battery modules are integrated to form a battery, such heat propagation may cause thermal runaway at the battery level. Therefore, it is necessary to prevent the gas and flame from being discharged to the front of the battery module M while allowing the gas and flame to be smoothly discharged in an upward direction. In addition, even when the blocking member 110 is interposed between the battery cells 100, the gas and flame discharged through the front of the battery cells 100 may cause heat propagation between the cells through the stepped portions of the adjacent battery cells. Therefore, it is necessary to prevent thermal runaway at the module level by blocking the occurrence of thermal propagation between the cells before the cell laminate 1. Disclosure of Invention Technical problem In order to solve the above-described problems of the prior art, it is an object of the present