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JP-2026075209-A - battery

JP2026075209AJP 2026075209 AJP2026075209 AJP 2026075209AJP-2026075209-A

Abstract

[Challenge] To provide high-quality batteries. [Solution] The positive electrode plate 100 constituting the electrode body 20 of the battery 1 is formed by forming a positive electrode composite material layer 102 on the surface of a positive electrode current collector foil 101. The positive electrode current collector foil 101 has a positive electrode main body portion 110 and a positive electrode tab 120. The positive electrode tab 120 is provided protruding from a positive electrode specific end portion 111 of the positive electrode main body portion 110. The positive electrode tab 120 on the positive electrode current collector foil 101 is the part connected to the positive electrode current collector member 4. The positive electrode main body portion 110 has a forming region 115 on its surface where the positive electrode composite material layer 102 is formed, spaced apart from the positive electrode specific end portion 111. As a result, the positive electrode main body portion 110 has a non-forming region 116 on its surface where the positive electrode composite material layer 102 is not formed, along the positive electrode specific end portion 111. The width of the non-forming region 116 is 2 mm or less. [Selection Diagram] Figure 3

Inventors

  • 出口 祥太郎

Assignees

  • トヨタバッテリー株式会社

Dates

Publication Date
20260508
Application Date
20241022

Claims (7)

  1. A battery having an electrode body formed by laminating a positive electrode plate, on which a positive electrode composite material layer is formed on the surface of a positive electrode current collector foil, and a negative electrode plate, on which a negative electrode composite material layer is formed on the surface of a negative electrode current collector foil, with a separator in between, wherein a positive electrode current collector and a negative electrode current collector are connected to the electrode body, The aforementioned positive electrode current collector foil is It has a positive electrode body and a positive electrode tab which is provided protruding from a specific positive electrode end of the end of the positive electrode body and is connected to the positive electrode current collector, The positive electrode body portion is, The formation region on which the positive electrode composite material layer is formed is provided at a distance from the specific end of the positive electrode, and the non-formation region on which the positive electrode composite material layer is not formed is provided along the specific end of the positive electrode. The battery has a width of 2 mm or less in the non-formed region.
  2. The battery according to claim 1, The aforementioned negative electrode current collector foil is It has a negative electrode body and a negative electrode tab which is provided protruding from a specific negative electrode end of the negative electrode body and is connected to the negative electrode current collector. The positive electrode tab and the negative electrode tab protrude from the same end of the electrode body in the battery.
  3. The battery according to claim 1, A battery in which the positive electrode specific end is located within a range from a position that protrudes 3 mm compared to the end of the negative electrode plate that constitutes the same end of the electrode body, to a position that is recessed 3 mm compared to the end of the negative electrode plate that constitutes the same end of the electrode body.
  4. The battery according to claim 1, The aforementioned non-formed region has a reinforcing layer on its surface, resulting in a battery with higher rigidity compared to the positive electrode current collector foil alone.
  5. The battery according to claim 4, The aforementioned reinforcing layer is an insulating layer having insulating properties.
  6. The battery according to claim 1, A battery in which a notch is formed in the aforementioned non-formed region.
  7. The battery according to claim 6, The aforementioned notch is semicircular or semi-elliptical in shape.

Description

This disclosed technology relates to a battery having an electrode body composed of a positive electrode plate and a negative electrode plate stacked with a separator in between. Some batteries utilize positive and negative electrode plates with tabs as current-collecting foils. For example, Patent Document 1 discloses a battery in which tabs on both the positive and negative electrode plates protrude from the upper part of the electrode body. Furthermore, Patent Document 1 describes forming tabs by punching the current collector. Additionally, Patent Document 1 describes that an active material layer, which is a composite material layer, is formed in the areas of the current collector other than the tab portions. Japanese Patent Publication No. 2011-70918 This is a schematic diagram of the battery according to an embodiment.This is a perspective view of an electrode body according to an embodiment.This figure shows the positive electrode plate, negative electrode plate, and separator that constitute the electrode body according to the embodiment.This is a cross-sectional view showing the tab of the electrode plate according to the embodiment.This is an enlarged cross-sectional view of the upper end of the electrode body according to the embodiment.This is an enlarged cross-sectional view of an electrode body constructed using a positive electrode plate without a non-formed region, at the position of the negative electrode tab.This is an enlarged cross-sectional view of the electrode body according to the embodiment, at the position of the positive electrode tab.This is an enlarged cross-sectional view of the electrode body at the position of the positive electrode tab in an embodiment in which a reinforcing layer is formed in a non-formed region.This figure shows a positive electrode plate according to an embodiment in which a notch is formed in the non-formed region. The following describes in detail embodiments of the disclosed technology, with reference to the attached drawings. Figure 1 shows the battery 1 according to this embodiment. Figure 1 shows the X-direction extending horizontally and the Z-direction extending vertically. The depth direction in Figure 1 is the Y-direction. In this embodiment, battery 1 is a lithium-ion secondary battery. Battery 1 houses the electrode body 20 inside the battery case 10. The electrode body 20 is constructed by stacking a positive electrode plate 100, a negative electrode plate 200, and a separator 30. The battery case 10 consists of a battery case body 11 and a lid 12. An opening is formed at the top of the battery case body 11 for housing the electrode body 20 inside the battery case body 11, and this opening is closed by the lid 12. The battery case 10 also contains an electrolyte solution 40. The battery case 10 in this embodiment has a flat, rectangular shape overall. Positive terminals 2 and negative terminals 3 are provided near both ends in the longitudinal direction of the lid 12. A positive current collector 4 is provided on the inside side of the battery case 10 relative to the positive terminal 2. The positive current collector 4 is connected to the positive terminal 2. Furthermore, the positive current collector 4 is connected to the positive tab 120 inside the battery case 10. Thus, the positive current collector 4 connects the positive terminal 2 to the positive tab 120 of the positive electrode plate 100. A negative electrode current collector 5 is provided on the inside of the battery case 10 at the negative electrode terminal 3. The negative electrode current collector 5 is connected to the negative electrode terminal 3. Furthermore, the negative electrode current collector 5 is connected to the negative electrode tab 220 inside the battery case 10. Thus, the negative electrode current collector 5 connects the negative electrode terminal 3 to the negative electrode tab 220 of the negative electrode plate 200. The connection between the positive electrode current collector 4 and the positive electrode tab 120, and the connection between the negative electrode current collector 5 and the negative electrode tab 220, can be achieved, for example, by welding. The battery 1 can then be charged or discharged via the positive electrode terminal 2 and the negative electrode terminal 3. Figure 2 is a perspective view of the electrode body 20. The electrode body 20 is constructed by laminating a sheet-like positive electrode plate 100, a negative electrode plate 200, and a separator 30. The electrode body 20 has a laminated portion 21. The laminated portion 21 is the part where the positive electrode plate 100 and the negative electrode plate 200 are laminated with the separator 30 sandwiched between them. In this embodiment, both the positive electrode tab 120 and the negative electrode tab 220 protrude from the ends of the electrode body 20. In this embodiment, both the positive electrode tab 120 and the negative electrode tab 220 are provided to protrud