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CN-116154267-B - Battery cell

CN116154267BCN 116154267 BCN116154267 BCN 116154267BCN-116154267-B

Abstract

The main object of the present disclosure is to provide a battery having a good junction between a tab and a collector terminal. In the present disclosure, the problem is solved by providing a battery including a plurality of power generation elements each including a1 st active material layer, a2 nd active material layer, an electrolyte layer disposed between the 1 st active material layer and the 2 nd active material layer, a1 st collector for collecting the 1 st active material layer, and a2 nd collector for collecting the 2 nd active material layer, the 1 st collector including a1 st tab including at least a root portion, a plurality of 1 st tabs being disposed so as to overlap each other in a thickness direction of the power generation elements, the battery including a1 st collector terminal electrically connected to the plurality of 1 st tabs, and a resin layer for reinforcing the root portion being disposed between adjacent 1 st tabs among the plurality of power generation elements.

Inventors

  • Yamamoto Somi

Assignees

  • 丰田自动车株式会社

Dates

Publication Date
20260508
Application Date
20221114
Priority Date
20211122

Claims (7)

  1. 1. A battery comprising a plurality of power generation elements, The power generating element includes a 1 st active material layer, a 2 nd active material layer, an electrolyte layer disposed between the 1 st active material layer and the 2 nd active material layer, a 1 st current collector for collecting current from the 1 st active material layer, and a 2 nd current collector for collecting current from the 2 nd active material layer, The 1 st current collector has a1 st tab including at least a root portion, In the thickness direction of the power generation element, a plurality of the 1 st tabs are arranged in an overlapping manner, The battery includes a1 st collector terminal electrically connected to the plurality of 1 st tabs, Among the plurality of power generation elements, a resin layer for reinforcing the root portion is disposed between the adjacent 1 st tab, In the thickness direction of the power generation elements, a height H1 of the resin layer located at least one end of a laminate which is an aggregate of the plurality of power generation elements is greater than a height H2 of the resin layer located at a center of the laminate, and a ratio H1/H2 of the H1 to the H2 is 1.1 or more and 2.0 or less.
  2. 2. The battery according to claim 1, The 1 st tab includes a curved portion disposed at a tip end of the root portion and extending in a direction intersecting an extending direction of the root portion.
  3. 3. The battery according to claim 2, An angle formed by the extending direction of the bending portion and the thickness direction of the power generating element is 0 DEG or more and 30 DEG or less.
  4. 4. The battery according to any one of claim 1 to 3, When the width of the 1 st tab is W T and the width of the resin layer is W R , W T and W R satisfy 0.5≤w R /W T .
  5. 5. The battery according to any one of claim 1 to 3, When the center line of the 1 st tab in the width direction is L C , the resin layer is present so as to overlap with the L C .
  6. 6. The battery according to any one of claim 1 to 3, The resin layer contains at least one of a thermoplastic resin and a curable resin.
  7. 7. The battery according to any one of claim 1 to 3, The resin layer contains an elastomer resin.

Description

Battery cell Technical Field The present disclosure relates to batteries. Background A battery such as a lithium ion secondary battery generally includes a power generation element (power GENERATING ELEMENT) having a positive electrode, a negative electrode, and an electrolyte layer disposed between the positive electrode and the negative electrode. Patent document 1 discloses a sealed battery in which a bent portion (curved portion) is provided in at least one of a positive electrode and a negative electrode, and the bent portion is brought into contact with a current collecting plate surface. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 2002-170547 Disclosure of Invention The positive electrode generally has a positive electrode active material layer and a positive electrode current collector. The negative electrode generally has a negative electrode active material layer and a negative electrode current collector. These collectors have tabs (tabs) for electrical connection with collector terminals. In general, the tab is thin, and thus, unintended deformation is easily generated. If the tab deforms, the tab and the collector terminal may be insufficiently bonded. The present disclosure has been made in view of the above circumstances, and a main object thereof is to provide a battery in which a tab and a collector terminal are well bonded. In the present disclosure, there is provided a battery including a plurality of power generation elements, the power generation elements including a1 st active material layer, a2 nd active material layer, an electrolyte layer disposed between the 1 st active material layer and the 2 nd active material layer, a1 st collector for collecting the 1 st active material layer, and a2 nd collector for collecting the 2 nd active material layer, the 1 st collector including a1 st tab including at least a root portion (root portion), the plurality of 1 st tabs being disposed so as to overlap each other in a thickness direction of the power generation elements, the battery including a1 st collector terminal electrically connected to the plurality of 1 st tabs, and the plurality of power generation elements including a resin layer for reinforcing the root portion disposed between adjacent 1 st tabs. According to the present disclosure, by providing the resin layer that reinforces the root portion of the tab, a battery in which the tab and the current collecting terminal are well bonded is obtained. In the above disclosure, the 1 st tab may include a curved portion disposed at a distal end of the root portion and extending in a direction intersecting an extending direction of the root portion. In the above disclosure, an angle formed between the extending direction of the bent portion and the thickness direction of the power generating element may be 0 ° or more and 30 ° or less. In the above publication, when the height of the 1 st tab is H T and the height of the resin layer is H R, 0.5 to 1H R/HT may be satisfied by H T and H R. In the above disclosure, H T and H R may satisfy H R/HT of 0.5 to 0.95. In the above publication, when the width of the 1 st tab is W T and the width of the resin layer is W R, W T and W R may satisfy 0.5≤w R/WT. In the above publication, when the center line of the 1 st tab in the width direction is L C, the resin layer may be present so as to overlap with the L C. In the disclosure, the resin layer may contain at least one of a thermoplastic resin and a curable resin. In the above disclosure, the resin layer may contain an elastomer resin. The battery of the present disclosure achieves the effect of good bonding of the tab and the collector terminal. Drawings Fig. 1 is a schematic front view illustrating a battery in the present disclosure. FIG. 2 is a section A-A and B-B of FIG. 1. Fig. 3 is a schematic cross-sectional view illustrating a method of forming a bent portion in the present disclosure. Fig. 4 is a schematic cross-sectional view illustrating a power generation element in the present disclosure. Fig. 5 is a schematic cross-sectional view illustrating a power generation element in the present disclosure. Fig. 6 is a schematic cross-sectional view illustrating a power generation element in the present disclosure. Fig. 7 is a schematic front view illustrating the power generation element in the present disclosure. Fig. 8 is a schematic cross-sectional view illustrating a method of forming a power generation element in the present disclosure. Description of the reference numerals 1. Active substance layer 1 2.2 Active substance layer Electrolyte layer First collector 1 4T. 1 st tab Second collector 2 5T. 2 nd tab 6. Resin layer Power generation element 20A. 1 st Current collecting terminal 20B. 2 nd collector terminal Battery 100 Detailed Description Hereinafter, the battery according to the present disclosure will be described in detail with reference to the accompanying drawings. The drawings shown belo