CN204927405U - A double pair of lug laminated soft pack power battery structure - Google Patents

Abstract

The utility model relates to a soft packet of power battery structure of biconjugate utmost point ear lamination formula comprises plastic -aluminum membrane casing, lithium cell aluminium utmost point ear, lithium cell copper -base ear, its characterized in that: battery electricity core forms lamination formula electricity core by the positive and negative pole piece staggered arrangement of a plurality of biconjugates utmost point ear, intermediate spacing with the folding diaphragm of zigzag, the biconjugate is the positive and negative pole piece of ear extremely, and the utmost point ear that its pole piece was reserved is two, and the upper right corner that utmost point ear is located the pole piece is reserved to the positive pole, and positive pole utmost point ear is in the lower left corner of pole piece, and the lithium cell copper -base ear welding of utmost point ear and top is reserved to the positive pole, and positive pole utmost point ear welds with the lithium cell copper -base ear of below, the reservation utmost point ear of negative pole also welds respectively on the special nickel utmost point ear of two laminate polymer battery according to same method, and above -mentioned structure is passed through plastic -aluminum complex film parcel and is constituteed the battery main part, and plastic -aluminum membrane casing overlaps in the battery main part. The uneven defect of current distribution when it can improve among the prior art the big multiplying power charge -discharge of lithium ion power batteries.

Description

A double pair of lug laminated soft pack power battery structure

technical field

The utility model relates to a double-pair lug lamination type soft pack power battery structure, which belongs to the technical field of batteries, in particular to the structure field of the lamination type soft pack lithium ion power battery.

Background technique

Now electric vehicles have become an important direction for the development of new energy vehicles. Among the energy storage units with mature technology at present, lithium-ion batteries have the characteristics of high discharge platform and high energy density, which are the most suitable energy storage units for electric vehicles. In the structure of lithium batteries, pouch batteries are light in weight, small in size and fast in heat dissipation, which have many advantages.

Traditional soft-pack batteries mostly use a single tab design. When charging and discharging with high current, the current distribution will be uneven, causing the tab to overheat, which poses a safety hazard.

Contents of the invention

The purpose of the utility model is to provide a double pair of lug lamination type soft package power battery structure, which can improve the defect of uneven current distribution in the prior art when the lithium ion power battery is charged and discharged at a high rate.

The technical solution of the utility model is realized in the following way: a double pair of lug lamination type soft package power battery structure, which is composed of an aluminum-plastic film shell, a lithium battery aluminum lug, and a lithium battery copper lug, and is characterized in that: The battery cell is composed of a plurality of double-tab positive and negative pole pieces staggered, and the middle interval is a Z-shaped folded diaphragm to form a stacked battery cell; the double-pair tab positive and negative pole pieces have two tabs reserved for the pole pieces. One, the reserved tab of the positive electrode is located in the upper right corner of the pole piece, the positive tab is located in the lower left corner of the pole piece, the reserved tab of the positive electrode is welded to the copper tab of the lithium battery above, and the tab of the positive pole is connected to the copper tab of the lithium battery below Welding; the reserved tabs of the negative electrode are also welded to the two special nickel tabs for pouch batteries in the same way. The above structure is wrapped with aluminum-plastic composite film to form the main body of the battery, and the aluminum-plastic film shell is sleeved on the main body of the battery.

The positive effect of the utility model is that at the same time, the tabs are arranged diagonally, which more balances the concentration area of the current density of a single tab, greatly improves the rate performance and safety performance of the battery, and can facilitate the series and parallel connection of the battery. For the tab battery, the single tab is smaller, which is helpful for the welding of the tab.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a sectional structure diagram of the utility model.

Fig. 3 is a schematic diagram of a double-pair lug pole piece of the present invention.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings: as shown in Figure 1-3, a double pair of lug laminated sheet type soft package power battery structure is composed of an aluminum-plastic film shell 1, a lithium battery aluminum lug 2, a lithium battery Composed of battery copper tabs 3, it is characterized in that: battery cells 1-2 are arranged in a staggered manner by multiple pairs of positive and negative tabs 4, and the middle interval is folded in a Z-shaped diaphragm to form a laminated cell; double pair of tabs Positive and negative pole pieces 4, there are two lugs reserved for the pole pieces, the reserved lug 4-1 for the positive pole is located at the upper right corner of the pole piece, the positive pole lug 4-2 is at the lower left corner of the pole piece, and the reserved pole for the positive pole is located at the upper right corner of the pole piece. Ear 4-1 is welded to the copper tab 3 of the upper lithium battery, and the positive tab 4-2 is welded to the copper tab 3 of the lower lithium battery; On the battery-specific nickel tab 2, the above-mentioned structure is wrapped by an aluminum-plastic composite film 1-1 to form a battery body, and the aluminum-plastic film casing 1 is set on the battery body.

When the batteries are connected in series, as shown in Figure 1, it is only necessary to weld a pair of positive pole lugs of the battery to a pair of negative pole lugs of another battery, and then connect them in series to form a group.

Claims (1)

1. A double-pair tab laminated soft-pack power battery structure, which is composed of an aluminum-plastic film shell, a lithium battery aluminum tab, and a lithium battery copper tab. The positive and negative electrodes of the ears are arranged in a staggered manner, and the diaphragm is folded in a Z shape to form a laminated battery cell in the middle interval; the positive and negative electrodes of the double pair of tabs have two tabs reserved for the pole piece, and the tabs reserved for the positive pole are located on the pole. The upper right corner of the sheet, the positive tab is at the lower left corner of the pole piece, the reserved tab of the positive electrode is welded with the copper tab of the lithium battery above, and the tab of the positive electrode is welded with the copper tab of the lithium battery below; the reserved tab of the negative electrode is also welded In the same way, it is respectively welded on two special nickel tabs for pouch batteries. The above-mentioned structure is wrapped by aluminum-plastic composite film to form the main body of the battery, and the aluminum-plastic film shell is sleeved on the main body of the battery.