CN204230338U - A kind of lug laser welding structure of lithium ion battery and the battery pack of formation thereof - Google Patents

Abstract

The utility model provides a kind of laser welding structure in lug interconnection technique field and the battery pack of formation thereof that belong to lithium ion battery, this structure comprises following parts: end clamping plate, battery frame, square aluminum strip, gather mounting panel, lug connecting plate, with lug end tab and pole etc., this structure can realize the lug connection in series-parallel connection of lithium ion battery and the connection in groups of battery.The mode reliability of this structure lock bolt connecting tab relatively is in the past higher, it is convenient to assemble, efficiency is high, connect internal resistance less, stability is better and connect more firm, effectively can also prevent loosening of battery when forming battery modules, the vibration in the situations such as road vehicle and impact can be tolerated.

Description

A kind of lug laser welding structure of lithium ion battery and the battery pack of formation thereof

Technical field

The utility model belongs to technical field of lithium ion, particularly a kind of assembling lithium ion battery and battery pack, and this structure is applicable to the assembling of aluminum plastic membrane shell lithium ion battery, is also suitable for the assembling of other electrokinetic cell.

Background technology

Increasingly serious along with the energy and environmental problem, under the promotion in the industrial policies such as energy-saving and emission-reduction, green credit, green security and market, electric automobile gradually cause society and the attention of government, the large branch that electric automobile also will become future automobile industry.One of electric automobile core technology is battery system.And the group technology of battery be determine this system whether can key problem in technology.

From existing battery technology and cost consideration, current lithium ion battery is suitable for electric automobile most, so the influence on development of lithium ion battery electric automobile development trend from now on.This also allows the application of lithium ion battery progressively expand to the high-power products such as electric automobile from the small-power product of traditional portable consumer electronic.

But at present, lithium ion cell polar ear is substantially all that the mode by locking bolt connects, technique loaded down with trivial details so not only wastes a large amount of manpower and materials, connect internal resistance also very large, and the material of lug connecting plate is also very single, substantially be all adopt copper coin to connect, because the weight issue of lithium battery monomer itself is also a problem in the urgent need to address always, then adopt the copper coin of several millimeters thick to be connected the weight more increasing whole battery system with bolt.

Because new-energy automobile driving cycle is complicated, and often there is vibration and impact phenomenon, the life-span of vehicle will more than 5 years, therefore for battery system vibration resistance and shock-resistant etc. require higher, the lug laser welding structure of battery in the utility model primary study battery system, solves the problem that battery easily loosens because of loosening of bolt in vehicle operating.

Utility model content

For problems of the prior art, the utility model provides a kind of lug laser welding structure of lithium ion battery, and for several cell is connected into battery pack, this structure comprises:

Battery frame, end clamping plate, fixed part, side's aluminum strip, gather mounting panel, lug connecting plate, wherein battery frame is multiple, cell is provided with between every two battery frames, in the outer end of outermost battery frame, end clamping plate are set, battery frame and end clamping plate are fixed by fixed part series connection, the draw-in groove place side's of the loading onto aluminum strip formed between every two pairs of battery combination frameworks, for connecting the lug of cell, collection mounting panel is loaded onto between every two cells, lug connecting plate is provided with above each collection mounting panel, this lug connecting plate has the width of two square aluminum strips that can cover described collection mounting panel both sides, the lug of neighboring unit cell by square aluminum strip together with lug connecting plate laser welding.

Wherein, by lug to the vertical bending in direction 90 degree of square aluminum strip and on the side's of being laminated on aluminum strip; For laser welding on lug after lug connecting plate laminates and covers bending; Lug connecting plate comprises: gather the lug connecting plate arranged above mounting panel, can cover two the square aluminum strips gathering mounting panel both sides; With, outermost two lug connecting plates, cover outermost side's aluminum strip and end clamping plate; Fixed part is preferably screw mandrel and split nut.

Wherein, this structure also comprises lug end tab, lug end tab backing plate, lug end tab pressing plate, outermost lug connecting plate is connected with lug end tab, above lug end tab and have lug end tab backing plate and lug end tab pressing plate supported by the mode of locking bolt and fixed and make it maintain static pole pressing below respectively.

A kind of lithium ion battery laser welding structure in groups, for several cell is connected into battery pack, concrete grammar has been built in cell between often pair of group frame and is connected in series by end clamping plate and screw mandrel by multiple and is fixedly clamped in groups, and make the positive and negative electrode lug bending 90 ° of each cell, then require by the positive pole ear of neighboring unit cell, negative lug by weld parts such as installation side's aluminum strip lug connecting plates together according to concrete connection in series-parallel.Described lug connecting plate material is the copper aluminum composite material that MATERION company produces, and its component is configured to the copper coin of 50%, the aluminium sheet of 50%, and during welding, copper polar ear welds copper coin, and aluminium pole ears welds aluminium sheet.The material of lug end tab is preferably copper coin.

The utility model additionally provides a kind of battery pack using above-mentioned lithium ion cell polar ear laser welding structure to be formed.

Assembling lithium ion battery framework of the present utility model is the compound mode that two battery frames press from both sides a cell, by battery folder in outside framework, directly do not contact between battery with battery, ensure that battery under extreme conditions also can not cause danger by the outside framework short circuit of aluminum plastic membrane shell lithium ion battery.There are alignment pin and installing hole between battery frame, can ensure that aluminum plastic membrane shell lithium ion battery combines arbitrarily, can suitability for industrialized production be realized.

Due to the difference of new energy vehicle, the specification demands of battery is also not quite similar, battery module and the battery system of different size can be made up of by different connection in series-parallel single battery, to meet the requirement of different vehicle, the lithium ion battery outside framework assembled battery that the utility model adopts can make a kind of lithium ion battery carry out series and parallel combination arbitrarily, ensures the operability of continuity and the technique of producing simultaneously.The standardization and seriation of so easy formation product.

The utility model is by a kind of effective design, and the battery module utilizing assembling lithium ion battery framework to form has good heat sinking function.

The utility model, by design, utilizes assembling lithium ion battery framework to ensure effectively to absorb the expansion of battery.

The beneficial effects of the utility model are: the laser welding process in the utility model structure, the material of a lot of difficult weldering can not only be solved, and the distortion of component is little, and joint quality is high, favorable reproducibility, Laser Welding can implement the heating of the small scope in local, be specially adapted to the welding between different materials, it is high that it has energy density, and speed of welding is fast, the series of advantages such as the little and workpiece deformation in heat affected area is little, can meet the special welding requirements of lithium battery.Adopt such connecting method of grouped batteries, owing to can reduce the use amount of bolt as far as possible, therefore, reliable, the stable connection of cell can be realized, be not only later full automation production and carried out sufficient preparation, this also solves the safe handling problem of lithium battery equally.Such burst mode is succinctly very convenient, is beneficial to maintenance, extends the life-span of battery fully, is applicable to the charging of vehicle, electric discharge, meets the requirement of New-energy electric vehicle further; Important progradation is served to domestic electric vehicle industrialization, greenization and high zinc foods.The mode reliability of this structure lock bolt connecting tab relatively is in the past higher, it is convenient to assemble, efficiency is high, connect internal resistance less, stability is better and connect more firm, effectively can also prevent loosening of battery when forming battery modules, the vibration in the situations such as road vehicle and impact can be tolerated.

Accompanying drawing explanation

The schematic diagram of the built-in cell of Fig. 1: a pair lithium ion battery framework.

Fig. 2: through the battery module schematic diagram of the 2P24S of end Boards wall.

Fig. 3: the side's of installation aluminum strip and lug folding 90 degree of schematic diagrames.

Fig. 4: install and gather mounting panel schematic diagram.

Fig. 5: install lug end tab and lug connecting plate schematic diagram.

Fig. 6: a kind of lug laser welding structure figure of lithium ion battery.

Number in the figure: 1. battery frame; 2. side's aluminum strip; 3. gather mounting panel; 4. lug connecting plate; 5. lug end tab; 6. lug end tab backing plate; 7. lug end tab pressing plate; 8. end clamping plate; 9. screw mandrel.

Embodiment

The following examples (for 2P24S 8Ah battery) can make those skilled in the art more fully understand the utility model, but limit the utility model never in any form.

The lug laser welding structure of embodiment 1 one kinds of lithium ion batteries, it mainly comprises following parts:

1. battery frame

2. side's aluminum strip

3. gather mounting panel

4. lug connecting plate

5. lug end tab

6. lug end tab backing plate

7. lug end tab pressing plate

8. end clamping plate

9. screw mandrel

10. pole

As shown in Figure 1, two battery frames 1 combine a built-in cell; 48 pairs of battery frame four rhizoid bars 9 are together in series, and are fixedly clamped in groups with two end clamping plate 8 split nuts in the mode of locking bolt in the outside of outermost battery frame, as shown in Figure 2.The draw-in groove place side's of the loading onto aluminum strip 2 formed between every two pairs of battery frames, in order to two cells are together in parallel, by lug to the vertical bending in direction 90 degree of square aluminum strip and on the side's of being laminated on aluminum strip, by that analogy, as shown in Figure 3, between every two cells, load onto collection mounting panel 3, as shown in Figure 4, finally, above each collection mounting panel 3, be provided with lug connecting plate 4, cover the square aluminum strip 2 of both sides; Outermost lug connecting plate 4 covers outermost side's aluminum strip 2 and end clamping plate 8 and is connected with lug end tab 5 (as shown in Figure 5), and lug end tab 5 has lug end tab backing plate 6 and lug end tab pressing plate 7 are supported by the mode of lock bolt and are fixed and make it maintain static pole pressing above and below respectively.

Assembling lithium ion battery framework in the utility model system ensures that when assembled battery battery is effectively fixing, vibratory impulse can be prevented the injury of battery, power brick is rolled in battery module simultaneously avoid in cell assembling processes and when installing in battery system to the injury of battery body.

Battery pack is mainly used on electric automobile, and therefore native system will meet the safety requirements of vehicle, ensures enough good insulation and fire prevention, vibrationproof performance, and the utility model is by rational selection and technique, and guarantee meets the safety requirements of vehicle and battery.

The above; be only the utility model preferably embodiment; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the change that can expect easily or replacement, all should be encompassed within protection range of the present utility model.

Claims (8)

1. a lug laser welding structure for lithium ion battery, for several cell is connected into battery pack, is characterized in that, this structure comprises:

Battery frame (1), end clamping plate (8), fixed part, side's aluminum strip (2), gather mounting panel (3), lug connecting plate (4), wherein battery frame (1) is for multiple, cell is provided with between every two battery frames, end clamping plate (8) are set in the outer end of outermost battery frame, battery frame (1) and end clamping plate (8) are fixed by fixed part series connection, the draw-in groove place side's of loading onto aluminum strip (2) formed between every two battery frames, for connecting the lug of cell, load onto between every two string cells and gather mounting panel (3), the top gathering mounting panel (3) is provided with lug connecting plate (4), the lug of neighboring unit cell by square aluminum strip (2) and lug connecting plate (4) laser welding together.

2. lug laser welding structure as claimed in claim 1, is characterized in that, by lug to the vertical bending in direction 90 degree of square aluminum strip (2) and on the side's of being laminated on aluminum strip (2).

3. lug laser welding structure as claimed in claim 1 or 2, it is characterized in that, lug connecting plate (4) comprising: gather the lug connecting plate (4) arranged above mounting panel, can cover two the square aluminum strips (2) gathering mounting panel (3) both sides; With, outermost two lug connecting plates (4), cover outermost side's aluminum strip (2) and end clamping plate (8); Wherein, lug connecting plate (4) is laminated on the lug after bending for laser welding.

4. lug laser welding structure as claimed in claim 1, it is characterized in that, fixed part is screw mandrel (9) and split nut.

5. the lug laser welding structure as described in claim as arbitrary in claim 1-4, it is characterized in that, also comprise lug end tab (5), lug end tab backing plate (6), lug end tab pressing plate (7), outermost lug connecting plate (4) is connected with lug end tab (5), and lug end tab (5) has lug end tab backing plate (6) and lug end tab pressing plate (7) are supported by the mode of locking bolt and are fixed and make it maintain static pole pressing above and below respectively.

6. lug laser welding structure according to claim 1, it is characterized in that: described lug connecting plate (4) material is copper aluminum composite material, its component is configured to the copper coin of 50%, the aluminium sheet of 50%, during welding, copper polar ear is to the welding of its copper coin part, and aluminium pole ears welds its aluminium sheet part.

7. lug laser welding structure according to claim 1, is characterized in that: lug end tab material (5) is copper coin.

8. use the lithium ion cell polar ear laser welding structure described in any one claim of claim 1 to 7 to form battery pack.