JP-7856857-B2 - Battery cells and battery assemblies including battery cells

JP7856857B2JP 7856857 B2JP7856857 B2JP 7856857B2JP-7856857-B2

Inventors

ファン，ウォンピル
イ，ジンキュ
カン，イェラン
パク，ジュンキュ
ユン，ドゥハン
キム，ソンジェ

Assignees

エルジーエナジーソリューションリミテッド

Dates

Publication Date: 20260511
Application Date: 20241004
Priority Date: 20231006

Claims (15)

Electrode assembly and A cover sheet including a main body portion surrounding the electrode assembly and a sealing joint portion extending from the upper part of the main body portion and connected to the main body portion , A first multi-functional terminal block (first MTB) is located at one end of the electrode assembly and includes a first housing connected to the main body portion of the cover sheet, It is a battery cell, The width of the sealing joint at the center of the sealing joint is smaller than the width of the sealing joint at the edge of the sealing joint, so that the seal is first broken at the center of the sealing joint when the internal pressure of the battery cell rises. Battery cell.
The battery cell according to claim 1, further comprising a fixing tape for securing the edge of the sealing joint to the main body.
The battery cell according to claim 1, further comprising an elastic band that tightly adheres the edge of the sealing joint and the main body of the cover sheet to the first housing.
The battery cell according to claim 1, wherein the main body portion of the cover sheet is attached to the first housing.
The battery cell according to claim 1, wherein the sealing joint is a joint formed by joining the first and second portions of the cover sheet together.
The sealing joint includes a first edge connected to the main body and a second edge opposite to the first edge. The profile of the second edge of the sealing joint includes a plurality of straight lines, The battery cell according to claim 1.
The sealing joint includes a first edge connected to the main body and a second edge opposite to the first edge. The profile of the second edge of the sealing joint includes a curve. The battery cell according to claim 1.
The battery cell according to claim 1, wherein, at the edge of the sealing joint, the width of the sealing joint decreases as it moves away from the end along the first direction of the sealing joint.
The battery cell according to claim 1, wherein the width of the sealing joint is uniform at the central part of the sealing joint.
The battery cell according to claim 1, wherein the first MTB is mounted in the first housing and further includes external terminals connected to the electrode leads of the electrode assembly.
The battery cell according to claim 1, further comprising a venting disc mounted on the first housing, wherein the venting disc is configured to rupture and release gas when the internal pressure of the battery cell increases.
The first MTB further includes a check valve mounted in the first housing, The check valve is configured to open to release internal gas when the internal pressure of the battery cell is higher than a reference pressure, and to close again after the internal pressure has eased. The battery cell according to claim 1.
The battery cell according to claim 1, further comprising a second multi-functional terminal block (second MTB) spaced apart from the first MTB in a first direction with the electrode assembly in between, wherein the second MTB includes a second housing connected to the main body portion of the cover sheet.
Multiple battery cells, Includes a cooling pad positioned between the plurality of battery cells, A battery assembly, Each of the aforementioned plurality of battery cells is Electrode assembly and A cover sheet including a main body portion surrounding the electrode assembly and a sealing joint portion extending from the upper part of the main body portion and connected to the main body portion, The electrode assembly includes a multi-functional terminal block (MTB) which is located at one end of the electrode assembly and includes a housing connected to the main body portion of the cover sheet, The width of the sealing joint at the center of the sealing joint is smaller than the width of the sealing joint at the edge of the sealing joint, so that the seal is first broken at the center of the sealing joint when the internal pressure of the battery cell increases. Battery assembly.
The main body portion of the cover sheet includes an upper portion that covers the upper surface of the electrode assembly and a side portion that covers the side surface of the electrode assembly. The cooling pad contacts the side portion of the main body of the cover sheet, The sealing joint is connected to the upper part of the main body of the cover sheet. The battery assembly according to claim 14.

Description

(Technical field) This invention relates to battery cells and battery assemblies including battery cells. (See related applications) This application claims priority under Korean Patent Application No. 10-2023-0133561 dated October 6, 2023, and all content disclosed in the said Korean Patent Application is incorporated herein as part of this specification. Unlike primary batteries, rechargeable batteries can be charged and discharged multiple times. Rechargeable batteries are widely used as an energy source for a variety of wireless devices, such as handsets, laptops, and wireless vacuum cleaners. In recent years, improvements in energy density and economies of scale have dramatically reduced the manufacturing cost per unit capacity of rechargeable batteries. As the driving range of battery electric vehicles (BEVs) increases to levels comparable to those of fuel-powered vehicles, the primary use of rechargeable batteries is shifting from mobile devices to mobility. As rechargeable batteries are used in mobility, the demand for their safety is increasing. Because accidents such as fires involving rechargeable batteries used in mobility can endanger the lives of drivers, research into technologies to enhance the safety of rechargeable batteries is absolutely essential. A perspective view showing a battery cell according to an exemplary embodiment of the present invention.Figure 1 is an exploded perspective view showing the battery cell.This is a cross-sectional view showing a portion of the battery cell in Figure 1.This is a plan view showing a portion of a battery cell.This is a perspective view showing a method for manufacturing battery cells.This is a perspective view showing a method for manufacturing battery cells.This is a perspective view showing a method for manufacturing battery cells.This is a plan view showing a part of a battery cell according to an exemplary embodiment of the present invention.This is a plan view showing a part of a battery cell according to an exemplary embodiment of the present invention.A perspective view showing an exemplary embodiment of the present invention: a battery assembly. Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Before that, however, terms and words used herein and in the claims should not be interpreted in their usual or dictionary sense, but rather in a sense and concept consistent with the technical idea of the present invention, based on the principle that inventors may appropriately define the concepts of terms in order to best describe their own invention. Therefore, the embodiments described herein and the configurations shown in the drawings represent only one of the most preferred embodiments of the present invention and do not represent the entire technical concept of the invention; thus, a variety of equivalents and modifications may exist that can substitute for them at the time of filing. Furthermore, in describing the present invention, if it is determined that a specific description of a related known configuration or function may obscure the gist of the invention, such detailed description will be omitted. The embodiments of the present invention are provided to more fully explain the invention to a person of ordinary skill; therefore, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or shown schematically for the sake of clarity. Accordingly, the sizes and proportions of each component do not fully reflect their actual sizes and proportions. Figure 1 is a perspective view showing a battery cell 100 according to an exemplary embodiment of the present invention. Figure 2 is an exploded perspective view showing the battery cell 100 of Figure 1. Figure 3 is a cross-sectional view showing a part of the battery cell 100 of Figure 1. Referring to Figures 1 to 3, the battery cell 100 may include an electrode assembly 110, a multifunctional terminal block (MTB) 120, and a cover sheet 130. The electrode assembly 110 may include a plurality of unit cells 111. Each of the unit cells 111 may be a metal foil coated with electrode material, each acting as a current collector. In exemplary embodiments, the electrode assembly 110 is a stacked electrode assembly, and the plurality of unit cells 111 can be stacked on top of each other in a second direction (e.g., the X direction). The electrode assembly 110, composed of the plurality of unit cells 111, may generally have a rectangular parallelepiped shape. The electrode assembly 110 may have first and second sides opposite in the second direction (e.g., the X direction) and top and bottom surfaces opposite in a third direction (e.g., the Z direction). Each unit battery 111 may have a thin, plate-shaped body extending in a first direction (e.g., the Y direction). Each unit battery 111 may be a positive electrode unit battery or a negative electrode unit battery. In some embodiments, the plurality of unit b