阅读说明：本技术 二次电池 (Secondary battery ) 是由 郭承昊 高珠煐 于 2020-03-06 设计创作，主要内容包括：一种二次电池包括:包括未涂覆部分接线片的电极组件；连接到所述未涂覆部分接线片并与所述未涂覆部分接线片一起弯折的集流构件；以及覆盖所述未涂覆部分接线片和所述集流构件的连接和弯折区域的带构件。(A secondary battery includes an electrode assembly including an uncoated portion of a tab; a current collecting member connected to the uncoated portion tab and bent together with the uncoated portion tab; and a band member covering the connection and bending regions of the uncoated portion tab and the current collecting member.)

1. A secondary battery comprising:

an electrode assembly including an uncoated portion tab;

a current collecting member connected to the uncoated portion tab and bent together with the uncoated portion tab; and

a band member covering the connection and bending regions of the uncoated portion tab and the current collecting member.

2. The secondary battery according to claim 1, wherein the belt member is attached to the uncoated portion tab.

3. The secondary battery according to claim 1, wherein the belt member is attached to the current collecting member.

4. The secondary battery according to claim 1, wherein the belt member includes a region attached to the uncoated part tab and another region attached to a part of the electrode assembly other than the uncoated part tab.

5. The secondary battery according to claim 1, wherein the band member includes a region attached to the current collecting member and another region attached to a portion of the electrode assembly other than the uncoated portion tab.

6. The secondary battery according to claim 1, wherein the belt member has heat resistance of at least 150 ℃.

7. The secondary battery according to claim 1, wherein the belt member comprises polyimide, polyetheretherketone, a liquid crystal polymer, or polyphenylene sulfide.

8. The secondary battery according to claim 1, wherein the current collecting member includes a first section connected to a terminal portion, a second section bent from the first section to be in tight contact with the electrode assembly, and a third section extending from the second section and connected to the uncoated portion tab.

9. The secondary battery according to claim 8, wherein the third section is bent to be in close contact with the second section.

10. The secondary battery according to claim 8, wherein the third segment is connected to the second segment.

11. The secondary battery according to claim 8, wherein the third segment is integrally formed with the second segment.

12. The secondary battery according to claim 1, further comprising a holder covering the belt member, the uncoated portion tab, and the current collecting member.

13. The secondary battery according to claim 12, further comprising an insulating pouch accommodating the electrode assembly and the holder.

Technical Field

Aspects of embodiments of the present disclosure relate to a secondary battery.

Background

Unlike a primary battery that cannot be charged, a secondary battery can be charged and discharged. A low-capacity secondary battery packaged in a pack form including a single battery cell may be used as a power source for various portable small electronic devices such as a cellular phone or a camcorder, and a high-capacity secondary battery having several tens to several hundreds of battery cells connected to each other may be used as a power source for a motor in, for example, a hybrid vehicle, an electric vehicle, or the like.

A secondary battery may be constructed by accommodating an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator between the positive electrode plate and the negative electrode plate, and an electrolyte in a case and mounting a cap plate on the case. Representative examples of the electrode assembly may include a winding type electrode assembly and a stacking type electrode assembly. The electrode assembly may include an uncoated portion tab protruding upward and a current collecting member connected to the uncoated portion tab.

The above information disclosed in this background section is only for enhancement of understanding of the background of the described technology and, therefore, it may contain information that does not constitute prior art that is already known in this country to a person of ordinary skill in the art.

Disclosure of Invention

According to an aspect of embodiments of the present disclosure, there is provided a secondary battery having a high capacity using a winding-type or stacking-type electrode assembly. According to another aspect of embodiments of the present disclosure, there is provided a secondary battery capable of preventing or substantially preventing an electrode assembly from being damaged by a current collecting member when an external force is horizontally applied. According to still another aspect of embodiments of the present disclosure, a secondary battery includes a current collecting member and an uncoated portion tab connected and bent to be completed using an insulating tape member, thereby preventing or substantially preventing problems, such as, for example, electrical short circuits, due to the restoration of the current collecting member and the uncoated portion tab, without restoring to their original state, which has not been bent.

These and other aspects and features of the present disclosure will be described in, or will become apparent from, the following description of some example embodiments of the present disclosure.

According to one or more embodiments of the present disclosure, a secondary battery includes an electrode assembly including an uncoated portion tab, a current collecting member connected to the uncoated portion tab and bent together with the uncoated portion tab, and a band member covering connection and bending regions of the uncoated portion tab and the current collecting member.

The band member may be attached to the uncoated portion tab or the current collecting member.

The band member may have a region attached to the uncoated part tab or the current collecting member and another region attached to a portion of the electrode assembly other than the uncoated part tab.

The belt member may have a heat resistance of at least 150 ℃.

The belt member may include polyimide, polyetheretherketone, liquid crystal polymer, or polyphenylene sulfide.

The current collecting member may include a first section connected to a terminal portion, a second section bent from the first section to be in close contact with the electrode assembly, and a third section extending from the second section and connected to the uncoated portion tab.

The third section may be bent to be in close contact with the second section.

The third section may be connected to the second section or may be integrally formed with the second section.

The secondary battery may further include a holder covering the belt member, the uncoated portion tab, and the current collecting member.

The secondary battery may further include an insulating pouch accommodating the electrode assembly and the holder.

As described above, the secondary battery according to the embodiment of the present disclosure employs a winding-type or stacking-type electrode assembly in which the uncoated portion tabs face in a first direction (e.g., a horizontal direction) instead of a second direction (e.g., a vertical direction), thereby effectively utilizing the inner space of the unit cells and increasing the battery capacity. In addition, in the secondary battery according to the embodiment of the present disclosure, since the current collecting member is bent after being connected to the uncoated portion tab, the electrode assembly may be prevented or substantially prevented from being damaged when an external force is horizontally applied, thereby preventing or substantially preventing an electrical short between the current collecting member and the electrode assembly. Further, in the secondary battery according to the embodiment of the present disclosure, after the current collecting member and the uncoated portion tab are connected and bent together, the final structure is completed using the insulating tape member, thereby preventing or substantially preventing the bent current collecting member and the bent uncoated portion tab from being restored to their original states, which have not been bent. Thereby, problems due to the restoration of the current collecting member and the uncoated portion tab, such as an electrical short, for example, can be avoided.

Drawings

Fig. 1A, 1B, and 1C are a perspective view, a sectional view, and a partial perspective view of a secondary battery according to an embodiment of the present disclosure.

Fig. 2 is a flowchart illustrating an assembly method of a secondary battery according to an embodiment of the present disclosure.

Fig. 3A to 3I are perspective views illustrating a method of manufacturing a secondary battery according to an embodiment of the present disclosure.

Description of reference numerals

100: secondary battery 110: electrode assembly

111: first electrode plate 112: second electrode plate

113: partition 114: first uncoated portion tab

115: second uncoated portion tab 116: first region

117A, 117B: second regions 118A, 118B: a third region

119A, 119B: band members 119C, 119D: retainer

120: the housing 130: first terminal part

131: first terminal post 132: first terminal board

133: first-terminal upper insulating member 134: first terminal sealing gasket

135: first-terminal lower insulating member 140: second terminal part

141: second terminal post 142: second terminal plate

143: second-terminal upper insulating member 144: second terminal sealing gasket

145: lower insulating member of second terminal

150: first current collecting member 151: the first section

152: second section 153: third section

160: second current collecting member 161: the first section

162: second section 163: third section

170: the lid assembly 171: cover plate

172: electrolyte injection unit 173: sealing plug

174: vent 175: ventilation plate