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Laminated lithium ion battery, battery pack comprising same and pole piece of laminated lithium ion battery

A lithium-ion battery and lamination technology, which is applied in the direction of non-aqueous electrolyte battery electrodes, battery pack components, secondary batteries, etc., can solve the problems of battery electrical performance degradation, battery performance changes, battery explosion, etc., to achieve current collectors The effects of increased area, reduced internal resistance, and good heat dissipation performance

Inactive Publication Date: 2015-09-02
SHENZHEN GREPOW BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When a high-power lithium-ion battery is working, the heat generated by the lithium-ion battery will cause the temperature of the battery to rise, and the lithium-ion battery is sensitive to temperature changes. When the temperature of the battery exceeds its normal temperature range, the electrical performance of the battery will change. The temperature rises and decreases, and the higher the temperature, the greater the performance change of the battery. If the temperature is too high, it may cause the battery to explode and cause safety hazards.

Method used

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  • Laminated lithium ion battery, battery pack comprising same and pole piece of laminated lithium ion battery
  • Laminated lithium ion battery, battery pack comprising same and pole piece of laminated lithium ion battery
  • Laminated lithium ion battery, battery pack comprising same and pole piece of laminated lithium ion battery

Examples

Experimental program
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Embodiment 1

[0067] see figure 1 As shown, this embodiment provides a pole piece suitable for laminated lithium-ion batteries, the pole piece comprising: a current collector 101 , and an active material layer 102 coated on the current collector 101 .

[0068] The active material layer 102 is coated to the end of the first width end of the pole piece, and a continuous uncoated area 103 is reserved at the end of the second width end of the pole piece. The front and bottom surfaces of the uncoated area are both The active material layer 102 is not coated, and the current collector 101 located in the uncoated area 103 is exposed. When applying the pole piece, the exposed current collector 101 can be used as the tab of the pole piece without additional welding of the tab.

[0069] The length of the exposed current collector 101 in this embodiment can be predetermined, and the length of the exposed current collector 101 can be made longer so that it can be bent and welded to external components....

Embodiment 2

[0077] see Figure 2-5 As shown, this embodiment provides a structure in which the positive electrode sheet and the negative electrode sheet of the structure described in Embodiment 1 are used to make a laminated lithium ion battery core body.

[0078] see figure 2 As shown, in this embodiment, the current collector of the positive electrode sheet is marked as the first current collector, and at the end of a width end of the positive electrode sheet, the exposed first current collector can be used as the tab of the positive electrode sheet (i.e., the positive electrode ear 202 ). The current collector of the negative electrode sheet is referred to as the second current collector, and the exposed second current collector section at one width end of the negative electrode sheet can be used as the tab of the negative electrode sheet (ie, the negative tab 201 ).

[0079] The positive electrode sheet and the negative electrode sheet are stacked together by lamination technology,...

Embodiment 3

[0090] see Figure 6 As shown, this embodiment provides a lithium-ion battery pack composed of the laminated lithium-ion batteries described in Embodiment 2.

[0091] When utilizing the stacked lithium-ion batteries of Embodiment 2 to form a lithium-ion battery pack in series, each lithium-ion battery can be arranged face-to-face and arranged together to form a lithium-ion battery pack. Specifically, for any adjacent two stacks Lithium-ion batteries, the first metal panel 501 of the shell of a laminated lithium-ion battery is in contact with the second metal panel 401 of the shell of another laminated lithium-ion battery face to face, and the laminated lithium ion battery can be realized. A series connection between ion batteries. It can be seen that when the laminated lithium-ion battery of this embodiment is used to form a battery pack, since the positive and negative poles of the battery are the plane of its housing, the batteries only need to be in face-to-face contact to...

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Abstract

Disclosed are a laminated lithium ion battery, a battery pack comprising the same and a pole piece of the laminated lithium ion battery. The pole piece comprises a current collector and an active material layer, wherein the current collector is coated with the active material layer. A section of continuous uncoated area is arranged at the tail end of a first width end portion of the pole piece, the top face and the bottom face of the uncoated area are not coated with the active material layer, the current collector is exposed in the uncoated area, and the exposed current collector serves as a pole lug of the pole piece. By the pole piece, internal resistance of the lithium ion battery is reduced and heat dissipation performance of the battery is improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a laminated lithium-ion battery, a battery pack formed by it, and pole pieces thereof. Background technique [0002] Due to its environmental protection and energy-saving characteristics, lithium-ion batteries have more and more widely replaced traditional energy sources. They can be the most promising power energy at present, and have been widely used as power supply energy in various fields, such as Lithium-ion batteries are being more and more widely used in electric vehicles as the power source of electric vehicles. [0003] The present inventor finds in the research process of the present invention, there is following defective in the lithium-ion battery of prior art in application process: [0004] When a high-power lithium-ion battery is working, the heat generated by the lithium-ion battery will cause the temperature of the battery to rise, and the lithium-ion batter...

Claims

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Application Information

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IPC IPC(8): H01M10/0585H01M10/0525H01M4/13H01M2/26H01M4/70H01M10/48H01M10/613H01M10/625H01M10/647H01M10/654H01M50/54
CPCH01M4/13H01M4/70H01M10/0525H01M10/0585H01M10/48H01M50/531Y02E60/10Y02P70/50
Inventor 何安轩王佳
Owner SHENZHEN GREPOW BATTERY CO LTD
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