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Laminated lithium ion battery pole core and battery comprising same

A lithium-ion battery, laminated technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as unfavorable batteries, misconnection or accidental short circuit, increase the complexity of battery system design, etc., to reduce The effect of internal resistance, simplifying the PACK process, and reducing the risk of misconnection or short circuit of positive and negative poles

Active Publication Date: 2021-04-20
SUZHOU YOULION BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A battery with multiple positive and negative pole structures requires an external circuit to separate the positive and negative poles, which increases the complexity of the battery system design; It is more prone to misconnection or accidental short circuit accidents, which is not conducive to the later battery pack

Method used

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  • Laminated lithium ion battery pole core and battery comprising same
  • Laminated lithium ion battery pole core and battery comprising same
  • Laminated lithium ion battery pole core and battery comprising same

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0042] Embodiment 1: The battery pole core is composed of an active unit 1, a positive balance plate 21 and a negative balance plate 22, and the structure is as follows Figure 4-Figure 6 As shown, in order to simplify the description, the diaphragm, battery case and insulating sheet in the figure are omitted. The positive pole piece 111 is 560 mm long and 70 mm wide, including a square base 11 coated with lithium iron phosphate active material on both sides and two tabs extending from the square base 11. The square base 11 is 500 mm long and 70 mm wide. The length is 30mm, the width is 25mm, and the pole lug 2 is 15mm long and 25mm wide. The square substrate 11 is an aluminum foil with a thickness of 15 microns, and the coating surface density of lithium iron phosphate is 40 mg / cm 2 The negative pole piece 112 is 570mm long and 72mm wide, including a square substrate 11 coated with graphite active material on both sides and two tabs extending from the square substrate 11, the ...

Embodiment 2

[0043] Embodiment 2: The battery pole core is composed of an active unit 1, a positive balance plate 21 and a negative balance plate 22, and the structure is as follows Figure 7-Figure 9 As shown, in order to simplify the description, the diaphragm, battery case and insulating sheet in the figure are omitted. The positive pole piece 111 is 560mm long and 70mm wide, including a square substrate 11 coated with lithium iron phosphate active material on both sides and two tabs extending from the square substrate 11. The square substrate 11 is 500mm long and 70mm wide. The length is 30mm, the width is 25mm, and the pole lug 2 is 15mm long and 25mm wide. The square substrate 11 is an aluminum foil with a thickness of 15 microns, and the coating surface density of lithium iron phosphate is 40 mg / cm 2 The negative pole piece 112 is 570mm long and 72mm wide, including a square substrate 11 coated with graphite active material on both sides and two tabs extending from the square subst...

Embodiment 3

[0044] Embodiment 3: The battery pole core is composed of an active unit 1, a positive balance plate 21 and a negative balance plate 22, and the structure is as follows Figure 10-Figure 12 As shown, in order to simplify the description, the diaphragm, battery case and insulating sheet in the figure are omitted. The positive pole piece 111 is 560 mm long and 70 mm wide, including a square base 11 coated with lithium iron phosphate active material on both sides and two tabs extending from the square base 11. The square base 11 is 500 mm long and 70 mm wide. The length is 30mm, the width is 25mm, and the pole lug 2 is 15mm long and 25mm wide. The square substrate 11 is an aluminum foil with a thickness of 15 microns, and the coating surface density of lithium iron phosphate is 40 mg / cm 2 The negative pole piece 112 is 570mm long and 72mm wide, including a square substrate 11 coated with graphite active material on both sides and two tabs extending from the square substrate 11, ...

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Abstract

The invention discloses a laminated lithium ion battery pole core and a battery comprising the same, and belongs to the technical field of lithium ion batteries. The laminated lithium ion battery pole core comprises a plurality of active units and a balance plate, the plurality of active units are arranged in a stacked manner to form the battery pole core, each active unit is of a laminated structure and is formed by stacking a square base body and a diaphragm, the square base body comprises a positive pole piece and a negative pole piece, the square base body extends outwards to form at least two positive pole lugs, the positive pole lugs are distributed on different side edges of the square base body, the square base body extends outwards to form at least two negative pole lugs, and the negative pole lugs are distributed on different side edges of the square base body. According to the invention, respective confluence of the positive and negative pole lugs in the battery shell is realized by using the electrode balance plate, the internal resistance is further reduced, only the unique positive pole and the unique negative pole are led out, the later PACK process of the battery is simplified, and the risk of misconnection or short circuit of the positive and negative poles is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a laminated lithium ion battery pole core and a battery including the pole core. Background technique [0002] With the large-scale application of lithium-ion batteries in new energy vehicles, energy storage power stations, etc., the demand for power battery systems is growing on a large scale. Increasing the size and capacity of a single battery can reduce the number of batteries required by the battery system, thus simplifying the assembly process of the battery system. The large size of a single battery has become the development trend of the industry, such as the cylindrical battery from 18650 to 21700, and then to the 4680 size proposed by Tesla, such as long square and large pouch batteries. [0003] The path of current in a large-sized battery becomes longer, and the internal resistance of the battery increases, causing rate problems and heat gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0585H01M10/0525H01M50/54H01M50/528
CPCY02E60/10Y02P70/50
Inventor 毛焕宇刘贯东尚随军吴刚徐晓磊
Owner SUZHOU YOULION BATTERY INC