CN205882054U

CN205882054U - Secondary battery

Info

Publication number: CN205882054U
Application number: CN201620823503.3U
Authority: CN
Inventors: 张敏; 杨凯; 王岳利
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2016-08-01
Filing date: 2016-08-01
Publication date: 2017-01-11
Anticipated expiration: 2026-08-01

Abstract

The utility model provides a secondary battery, it includes that electric core, casing and lead wire are around the son. A plurality of utmost point ears with polarity that the electricity core has the main part and stretches out from the main part. Housing seal accepts electric core. The lead wire has around the son: the joining region, with a plurality of utmost point ear fixed connection together, sealed district is located the joining region and follows length direction's the outside and encapsulate at the casing. Each utmost point ear exceedes part along the main part inflection from length direction to electric core of lead wire around the sealed district of son along length direction. The utility model discloses a main part and lead wire that secondary battery has effectively shortened electric core around the distance between the joining region of son and lead wire around the distance between the joining region of son and the sealed district, and need not anxious utmost point ear overlength and extend to the lead wire around the sealed district of son, it is extravagant to reduce the inside space of casing, thereby the improvement the utility model discloses a secondary battery's volume energy density, simultaneously, the length design comparison of utmost point ear is nimble, need not to simplify processing technology through the process of cutting.

Description

Secondary cell

Technical field

This utility model relates to field of batteries, particularly relates to a kind of secondary cell.

Background technology

Along with power vehicle course continuation mileage requires more and more higher, automobile to the volume energy density of lithium ion battery it is also proposed that Requirements at the higher level, reduce as far as possible in terms of battery design or compress unnecessary volume waste and have become as lithium ion battery and set The trend of meter.At present for multi pole ears soft-package battery, the lifting of volume energy density is how to shorten closedtop greatly Seal (at the seal of case top) and the intersubjective distance of battery core, therefore, lug is designed to shortening envelope with lead-in wire around sub Print limit and the key of battery core main body spacing, the method generally used has: one, lug does not cuts the (length of lug Unanimously), and on the premise of ensureing that lug can weld, lug design is longer, but owing to lug is along the thickness direction of battery core main body Distribution, when all tab weldings are at one, it may appear that uneven phenomenon, to ensure lug weldering print area (i.e. flow-passing surface Long-pending), weldering print is accomplished by leaning on toward main body, avoids misplacing between lug, it means that lug need to suitably lengthen, simultaneously for avoiding lug to connect Contacting lead-in wire around sub-seal district, the risk of lug and housing conducting occur, going between will be suitable in the length of enclosure interior around son Lengthen；Two, for further reducing inner space can avoid again the former produced problem while, general lug is carried out before welding Suitably cut so that it is when being welded at one, length is consistent, so the shortizationest can go between around son length in housing, but can deposit At some inevitable metal fillings, increase Hi-pot (the internal micro-short circuit of battery core) bad product rate；Three, lead-in wire bends around son, Lead-in wire is the most harder around son at present, and bending difficulty is bigger, and the lead-in wire after bending adds around son and insulate enclosure interior simultaneously The risk that layer is damaged.

Utility model content

In view of problem present in background technology, the purpose of this utility model is to provide a kind of secondary cell, and it can carry High volume energy density, simplified processing process.

To achieve these goals, this utility model provides a kind of secondary cell, it include battery core, housing and lead-in wire around Son.Battery core has main part and the multiple lugs of same polarity stretched out from main part.Housing seal houses battery core.Lead-in wire is around sub-tool Have: bonding pad, be fixed together with the plurality of lug；Seal area, is positioned at outside along its length, bonding pad and envelope It is contained in housing.Wherein, each lug exceedes the part around the seal area of son that goes between along its length along its length to battery core Main part inflection.

The beneficial effects of the utility model are as follows:

According in secondary cell of the present utility model, exceed the seal area gone between around son along its length due to each lug Part along its length to the main part inflection of battery core, so ensureing that the plurality of lug and lead-in wire are solid around the bonding pad of son On the premise of determining bonding strength, the plurality of lug is fixed, around the bonding pad of son, the part being connected with lead-in wire and can be leaned on as far as possible The main part of nearly battery core, is effectively shortened main part and the distance gone between the bonding pad of son of battery core and goes between around son Bonding pad and seal area between distance, and without having to worry about lug long extend to go between around son seal area, reduce housing Internal space waste, thus improve the volume energy density of secondary cell of the present utility model；Meanwhile, the Design of length of lug The most flexibly, it is not necessary to through cutting process, simplified processing process.

Accompanying drawing explanation

Fig. 1 is the axonometric chart according to secondary cell of the present utility model, it is shown that battery core and lead-in wire are around son；

Fig. 2 is the schematic diagram of the embodiment according to secondary cell of the present utility model；

Fig. 3 is the schematic diagram of another embodiment according to secondary cell of the present utility model；

Fig. 4 is the schematic diagram of the another embodiment according to secondary cell of the present utility model.

Wherein, description of reference numerals is as follows:

1 battery core 31 bonding pad

11 main part 32 seal areas

12 lugs 4 insulate film

2 housing L length directions

3 lead-in wires are around sub-T thickness direction

Detailed description of the invention

Describe secondary cell of the present utility model with reference to the accompanying drawings in detail.

Referring to figs. 1 through Fig. 4, include that battery core 1, housing 2 and lead-in wire are around son 3 according to secondary cell of the present utility model.Battery core 1 There are main part 11 and the multiple lugs 12 of same polarity stretched out from main part 11.Housing 2 seals and houses battery core 1.Go between around son 3 Have: bonding pad 31, be fixed together with the plurality of lug 12；Seal area 32, is positioned at bonding pad 31 L along its length Outside and be encapsulated in housing 2.

Wherein, each lug 12 L along its length exceedes the part L along its length around the seal area 32 of son 3 that goes between to electricity Main part 11 inflection of core 1.

According in secondary cell of the present utility model, owing to each lug 12 L along its length exceedes go between around son 3 close The part L along its length in envelope district 32 to main part 11 inflection of battery core 1, so ensure the plurality of lug 12 and lead-in wire around On the premise of bonding strength is fixed in the bonding pad 31 of son 3, the plurality of lug 12 is connected with going between to fix around the bonding pad 31 of son 3 Part the main part 11 of battery core 1 as far as possible near the main part 11 of battery core 1, can be effectively shortened with lead-in wire around son 3 Distance between bonding pad 31 and lead-in wire distance between bonding pad 31 and the seal area 32 of son 3, and without having to worry about lug The 12 long seal areas 32 around son 3 that go between that extend to, minimizing space waste within housing 2 (reduces lead-in wire around son 3 at housing 2 Interior length, thus reduce space waste), thus improve the volume energy density of secondary cell of the present utility model；Meanwhile, pole The Design of length of ear 12 is more flexible, it is not necessary to through cutting process, simplified processing process.

Supplementing at this, each lug 12 L along its length exceedes the part around the seal area 32 of son 3 that goes between and is each pole Ear 12 with lead-in wire around son 3 seal area 32 in part overlapping for thickness direction T.

In the embodiment according to secondary cell of the present utility model, with reference to Fig. 2 to Fig. 4, described secondary cell also wraps Include: insulation film 4, cladding anchor leg around the bonding pad 31 of son 3, each lug 12 fixes around the bonding pad 31 of son 3 with lead-in wire The position connected and the part of the inflection of each lug 12.Insulation film 4 can either fix the part of the inflection of each lug 12, also It is avoided that the part of the inflection of each lug 12 is short-circuited with housing 2 (having metal level in the middle of housing 2).

In the embodiment according to secondary cell of the present utility model, super with reference to Fig. 3, each lug 12 L along its length Cross the part L along its length around the bonding pad 31 of son 3 that goes between to main part 11 inflection of battery core 1.Generally, lead-in wire is around son 3 Bonding pad 31 is spaced a distance with seal area 32, if each lug 12 L along its length exceedes the bonding pad gone between around son 3 The part of 31 L along its length, to main part 11 inflection of battery core 1, can avoid each lug 12 to take the connection gone between around son 3 Space between district 31 and seal area 32, and then the distance gone between bonding pad 31 and the seal area 32 of son 3 can be shortened, Improve the volume energy density of secondary cell.

In the embodiment according to secondary cell of the present utility model, with reference to Fig. 4, the lug 12 of all same polarities is positioned at Lead-in wire is around the same side of the through-thickness T of son 3.

In the embodiment according to secondary cell of the present utility model, with reference to Fig. 2 and Fig. 3, the lug of all same polarities A part of lug 12 of 12 is positioned at the side of through-thickness T gone between around son 3, and the remainder lug 12 of all lugs 12 It is positioned at the lead-in wire contrary opposite side around the through-thickness T of son 3.

In the embodiment according to secondary cell of the present utility model, multiple lugs 12 of described same polarity are welded in and draw Line is around the bonding pad 31 of son 3, so that lead-in wire is fixed together with the plurality of lug 12 around the bonding pad 31 of son 3.

In the embodiment according to secondary cell of the present utility model, lug 12 is positive pole ear or negative lug.Ginseng According to Fig. 1, secondary cell can have two groups of lugs 12 and two lead-in wires around son 3, and the lug of two groups (is just being respectively positive pole ear Pole lug is multiple) and negative lug (negative lug is multiple), positive pole ear and lead-in wire connect around son 3 is fixing, negative pole Lug goes between with another to fix around son 3 and is connected.

In the embodiment according to secondary cell of the present utility model, described secondary cell is soft-package battery.

In the embodiment according to secondary cell of the present utility model, with reference to Fig. 2 to Fig. 4, housing 2 is by two sub-housings It is tightly connected and forms.

Claims

1. a secondary cell, including:

Battery core (1), has main part (11) and the multiple lugs (12) of same polarity stretched out from main part (11)；

Housing (2), seals and houses battery core (1)；

Go between around son (3), have:

Bonding pad (31), is fixed together with the plurality of lug (12)；

Seal area (32), is positioned at the outside of bonding pad (31) (L) along its length and is encapsulated in housing (2)；

It is characterized in that,

Each lug (12) (L) along its length exceedes the part (L) along its length around the seal area (32) of son (3) that goes between to electricity Main part (11) inflection of core (1).

Secondary cell the most according to claim 1, it is characterised in that described secondary cell also includes:

Insulate film (4), and cladding anchor leg around the son bonding pad (31) of (3), each lug (12) and go between around the company of son (3) Connect the part of the inflection of the fixing position connected, district (31) and each lug (12).

Secondary cell the most according to claim 1, it is characterised in that each lug (12) (L) along its length exceedes lead-in wire Part (L) along its length around the bonding pad (31) of son (3) is to main part (11) inflection of battery core (1).

Secondary cell the most according to claim 1, it is characterised in that

The lug (12) of all same polarities is positioned at lead-in wire the same side around the through-thickness (T) of son (3)；Or

A part of lug (12) of the lug (12) of all same polarities is positioned at the lead-in wire side around the through-thickness (T) of son (3), And the remainder lug (12) of all lugs (12) is positioned at the contrary opposite side of through-thickness (T) gone between around son (3).

Secondary cell the most according to claim 1, it is characterised in that multiple lugs (12) of described same polarity are welded in and draw Line is around the bonding pad (31) of son (3), so that lead-in wire is fixedly connected on the plurality of lug (12) around the bonding pad (31) of son (3) Together.

Secondary cell the most according to claim 1, it is characterised in that lug (12) is positive pole ear or negative lug.

Secondary cell the most according to claim 1, it is characterised in that described secondary cell is soft-package battery.

Secondary cell the most according to claim 1, it is characterised in that housing (2) is formed by connecting by two sub-housing seals.