CN202454663U

CN202454663U - Current collector and battery pack adopting same

Info

Publication number: CN202454663U
Application number: CN2012200731997U
Authority: CN
Inventors: 赵彪; 肖调坤
Original assignee: Microvast Power Systems Huzhou Co Ltd
Current assignee: Microvast Power Systems Huzhou Co Ltd
Priority date: 2012-03-01
Filing date: 2012-03-01
Publication date: 2012-09-26
Anticipated expiration: 2022-03-01

Abstract

The utility model relates to a current collector for a battery pack; in addition, the utility model also relates to the battery pack adopting the current collector; and because radiating fins are arranged on the current collector, the heat of the heat collector which is produced by electrification can be quickly dissipated, and the reliability of the current collector is improved. For the battery pack which adopts the heat collector, pole ears are connected with the radiating fins, so that the heat which is produced by a part which has the most heating value, of a cell can be quickly led out, the heat dissipation of the whole battery pack is facilitated, and the reliability of the whole battery pack is improved.

Description

Collector and the power brick that adopts this collector

[technical field]

The utility model relates to a kind of collector that is used for power brick; In addition, the utility model also relates to a kind of power brick that adopts this collector.

[background technology]

Along with reducing day by day with the pollution of environment of petroleum resources is day by day serious, the protection environment, energy-saving and emission-reduction have become present trend and trend in the world.Under this background, in recent years, be that the motor vehicle of major impetus source or partial power source (mainly comprises PHEV with the battery; The plug-in hybrid car; Engender and increasing that pure electric vehicle) the carbon emission amount of motor vehicle is less than the traditional combustion engine automobile, the carbon emission of pure electric vehicle even be zero; And have the high characteristics of energy conversion efficiency, this makes people electric automobile is regarded as an important selection of following replace internal combustion engines car.

At present, the main selection of electric automobile power battery is a lithium ion battery, and traditional cylindrical lithium ion battery (common has 18650 types; 26650 types) though be widely used in 3C Product (mobile phone; Computer, digital camera) power supply, but traditional lithium ion battery is because the character of itself material and the influence of shaped design; Be easy to generate thermal runaway phenomenon, lithium ion battery burning just took place repeatedly in the cells in notebook computer field cause the incident of recalling.This make people with lithium ion battery when being applied to electric automobiles, be faced with the test of fail safe.So, in order to improve the security performance of lithium ion battery, in recent years; People develop the lithium ion battery of some new structures in succession; Soft-package battery (soft-bag battery or claim coffee-bag battery) for example, rectangular cell (Prismatic battery or claim Prismatic pouch battery) is compared with traditional column lithium ion battery; Soft-package battery or rectangular cell generally are flat; A side or relative both sides at battery have lug, and lug generally also is flat, and it is shell that soft-package battery generally adopts aluminum plastic film; Rectangular cell can adopt metal material to constitute flat rectangular-shaped shell, also can adopt the aluminum plastic film shell.Soft-package battery or rectangular cell have than columniform lithium ion battery and have better heat dispersion.So present most electric automobiles adopt soft-package battery monomer or rectangular cell monomer to constitute the electrokinetic cell bag.

In the process of development electric automobile power battery bag; A key problem is exactly the battery group technology; The general energy storage of power battery pack of electric household automobile (especially pure electric automobile) is all more than 20kWh; And pure electric bus, the energy storage of the power battery pack of truck even can reach kWh up to a hundred.Huge energy like this, often up to a hundred thousands of of needs even up to ten thousand battery cells constitute a power brick.For the battery group technology is huge test.Though the heat dispersion of Soft Roll or rectangular cell is better than the plain cylindrical form lithium ion battery,, when the battery cell (or being referred to as electric core) of huge amount is integrated in the very limited power brick space; Caloric value is huge; The appearance in " focus " zone is difficult to avoid in the power brick, and the appearance of hot spot region can further cause the environmental parameter in the power brick inhomogeneous again, and then influences the expansion of inconsistency between battery cell; Finally can cause the damage of power brick even influence the car load safety problem; So so far, electric core heat dissipation problem remains quite difficult in the design of a battery for electric automobile bag aspect.At present, for the heat radiation of entire cell bag, mainly contain air-cooled and these two kinds of methods of liquid cooling, perhaps two kinds of methods are united use.Air-cooled is that the air channel that utilizes natural wind or air-conditioning cold wind to pass in the power brick is come power brick is cooled off.Liquid cooling then is to flow through the pipeline that is arranged in the power brick through cooling fluid; Take away the heat in the power brick; And no matter be air-cooled or liquid cooling; After generally all need the heat that electric core produced of stack in the power brick or accumulation being derived, through cold wind or cooling fluid these heats are taken away again by thermal component (being generally fin).

In the Soft Roll power brick that perhaps square electric core is formed; Common layout designs is at present: see Fig. 1 and Fig. 2; Fig. 1 is an a kind of part sketch map of soft-package battery bag, and Fig. 2 is the left view of Fig. 1: a plurality of Soft Rolls or rectangular cell stack are connected in parallel (also can connect), and the positive pole ear of each electric core all is connected with collector; Collector is generally copper material and constitutes, and generally speaking is a copper coin.Collector is connected with the output of entire cell bag.In the middle of two adjacent electric cores, be provided with a fin, fin is generally aluminium matter, and its width is generally greater than the width of electric core.The heat that sent of electricity core is dispersed into the outside of electric core region through fin, and then dispels the heat through the method for air-cooled or liquid cooling.Though this design has utilized the excellent heat conductivity property of metal material that the heat that electric core sent is derived, the overall applicability effect in reality is not fully up to expectations.Reason mainly contains: on the one hand; Monomer electricity core in use, the different calorie values that the zone produced are different, because lug compiles outflow/inflow region as the electric current of electric core; It has born the current strength (generally can reach tens amperes) of whole electric core; And the calorie value that electric current produced is and square being directly proportional of current strength, so the heat that the lug zone produces is more, but the derivation of lug zone heat is not but considered in present design; On the other hand; Output as the entire cell bag; Current strength through collector is more huge (generally can reach amperes up to a hundred); The heat derivation problem of collector part is not considered in present design equally, and collector itself also is easy to owing to overheated breaking down (such as the cable around having ignited) even fusing.

[utility model content]

The purpose of the utility model promptly is to the problems referred to above, and a kind of collector of good heat dissipation effect is provided.Another purpose of the utility model is: a kind of good heat dissipation effect is provided, the power brick that reliability is high.

To achieve these goals, the utility model comprises: a kind of collector, it comprises: body, described body is provided with at least one fin.

Body is generally metal material, and common is copper.

As a kind of execution mode, offer at least one through hole on the body of collector.

The utility model also comprises a kind of power brick, and it comprises: at least one battery cell, and aforesaid collector, and the lug of battery cell is connected with described fin.

As a kind of execution mode, offer at least one through hole on the body of collector, lug passes this through hole.

As another kind of execution mode, offer at least one through hole on the body of collector, lug passes this through hole, and lug passes this through hole and the part that exceeds fits in the body of collector.

Described battery cell is soft-package battery or rectangular cell.

Owing on collector, be provided with fin, make collector owing to the heat that energising produces can be shed fast, make the reliability of collector increase.For the power brick that has adopted this collector, the lug part is connected with fin, and the heat that makes electric core caloric value the best part produced can be derived fast, helps the heat radiation of entire cell bag, and the reliability that improves the entire cell bag.

[description of drawings]

Fig. 1 is common design pattern in the existing soft-package battery group;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is the sketch map of power brick embodiment 1;

Fig. 4 is the sketch map of power brick embodiment 2;

Fig. 5 is the sketch map of power brick embodiment 3;

Fig. 6 is the vertical view of Fig. 5;

Fig. 7 is the sketch map of collector embodiment 1;

Fig. 8 is the sketch map of collector embodiment 2;

Fig. 9 is for adopting the power brick of Fig. 1 and technical scheme shown in Figure 5, at the temperature rising comparison diagram that discharges and recharges equally under the condition.

Wherein: 1. collector; 11. body; 12. fin; 13. through hole; 2. battery cell; 21. lug.

[embodiment]

Come the utility model is done specific descriptions below in conjunction with accompanying drawing and embodiment

Collector embodiment 1

Meaning as shown in Figure 7: a kind of collector 1, it comprises body 11, body 11 is provided with a plurality of fin 12.Body 11 is the metal material material with fin 12 and processes, and common used material comprises copper and aluminium.Only provided the part diagram of collector 1 among Fig. 7, the sheet number average of its length and fin 12 can increase according to the needs of power brick or reduce.

Collector embodiment 2

Meaning as shown in Figure 8: a kind of collector 1; It comprises body 11, and body 11 is provided with a plurality of fin 12, on body 11, also has a plurality of through holes 13 that are used to pass lug 21; Body 11 is the metal material material with fin 12 and processes, and common used material comprises copper and aluminium.Only provided the part diagram of collector 1 among Fig. 8, the sheet number of its length and fin 12 and the individual number average of through hole can increase according to the needs of power brick or reduce.

Power brick embodiment 1

[019] meaning as shown in Figure 3: a kind of power brick, comprise at least one battery cell 2, described battery cell 2 has lug 21, and described power brick also comprises the 1 described collector 1 like embodiment, and described lug 21 is connected with described fin 12.In Fig. 3,,, because fit system is identical, do not draw so omit at opposite side so only provided a side pole ear 21 and the sketch map that collector 1 matches because battery cell 2 is a symmetric shape.

Power brick embodiment 2

Meaning as shown in Figure 4: a kind of power brick; Comprise at least one battery cell 2; Described battery cell 2 has lug 21, and described power brick also comprises the 2 described collectors 1 like embodiment, and described lug 21 passes described through hole 13 and is connected with described fin 12.In Fig. 4,,, because fit system is identical, do not draw so omit at opposite side so only provided a side pole ear 21 and the sketch map that collector 1 matches because battery cell 2 is a symmetric shape.

Power brick embodiment 3

Meaning as shown in Figure 5: a kind of power brick; Comprise at least one battery cell 2; Described battery cell 2 has lug 21; Described power brick also comprises the 2 described collectors 1 like embodiment, and described lug 21 passes described through hole 13 and be connected with described fin 12, and lug 21 is passed the part bending of through hole 13 and makes bending part applying body 11.

Fig. 6 is the vertical view of Fig. 5.In Fig. 5,,, because fit system is identical, do not draw so omit at opposite side so only provided a side pole ear 21 and the sketch map that collector 1 matches because battery cell 2 is a symmetric shape.

Fig. 9 has provided the power brick that adopts Fig. 1 and technical scheme shown in Figure 5; At the temperature rising comparison diagram that discharges and recharges equally under the condition; Rectangular pulse is a charging and discharging curve among the figure; Comparatively the curve of top is the temperature of the power brick of employing Fig. 1 technical scheme, and comparatively the curve of below is the temperature that adopts the power brick of Fig. 5 technical scheme., can find out that adopted the power brick of the utility model technical scheme, its temperature will be low than the conventional batteries bag.

The protection range of the utility model is not limited in embodiment, and all variation and changes of under the utility model spirit, being done all should drop within the utility model protection range.

Claims

1. a collector (1), comprising: body (11) is characterized in that: described body (11) is provided with at least one fin (12).

2. collector as claimed in claim 1 (1) is characterized in that: on described body (11), offer at least one through hole (13).

3. power brick; Comprise: at least one battery cell (2), described battery cell have lug (21), it is characterized in that; Described power brick also comprises collector as claimed in claim 1 (1), and described lug is connected with described fin (12).

4. power brick as claimed in claim 3; Comprise at least one battery cell (2); Described battery cell has lug (21), it is characterized in that: on described collector (1), offer at least one through hole (13), described lug (21) passes described through hole (13).

5. power brick as claimed in claim 4 is characterized in that: described lug (21) passes said through hole (13) and the part that exceeds fits in described body (11).

6. like claim 3 or 4 or 5 described power brick, it is characterized in that: described battery cell (2) is soft-package battery or rectangular cell.