CN201413847Y

CN201413847Y - Lithium-ion power battery

Info

Publication number: CN201413847Y
Application number: CN2009200445160U
Authority: CN
Inventors: 周金平
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-06-04
Filing date: 2009-06-04
Publication date: 2010-02-24
Anticipated expiration: 2019-06-04

Abstract

The utility model relates to a lithium-ion power battery, which comprises an outer shell (1) and laminated cells (16), wherein the outer shell (1) is packaged outside the laminated cells (16); the laminated cells (16) comprise negative plates (9), positive plates (10) and insulating diaphragms (7); lug splints (27) are arranged at both sides of the lower part of a negative lug connector (21); thenegative plates (9) are connected with the negative lug connector (21) through fixing parts (20) which penetrate on the lug splints (27); the lug splints (27) are also arranged at both sides of the lower part of a positive lug connector (22); the positive plates (10) are connected with the positive lug connector (22) through the fixing parts (20) which penetrate on the lug splints (27); the shapeof all the negative plates (9) is the same; and the shape of all the positive plates (10) is the same. The lithium-ion power battery has the advantages of simple processing technology, low cost, longcycle life, high safety, beautiful appearance and good stability.

Description

Lithium-ion-power cell

Technical field

The utility model relates to a kind of rechargeable battery, and particularly a kind of lithium-ion-power cell belongs to the electrokinetic cell field, and being mainly used in the lithium-ion-power cell is the various hybrid automobiles of power source and pure electric automobile etc.

Background technology

The primary structure of lithium-ion-power cell has two kinds at present, a kind of is that rolled electric core is encapsulated in the formula that rolls lithium-ion-power cell in circle or the square shell, but the heat radiation of electric core only depends on the gaseous exchange exchange of inner space and the medium heat conduction of minimum part in this battery operated process, therefore this structure can not solve heat dissipation problem effectively all the time, this just causes this structure can not accomplish big capacity (can only about 10Ah) lithium-ion-power cell.Even some producer can do capacity greatly, also can make the very fast decay of battery capacity owing to temperature rise can not get solving, shortened the life-span of battery greatly, even burst, lose more than gain.Therefore be that the folded lamination electricity core that makes is encapsulated in laminated type lithium-ion-power cell in circle or the square shell through improving second kind of present lithium-ion-power cell structure, it have heat conduction and heat radiation effective, can do high capacity cell, fail safe is good, advantage such as have extended cycle life, particularly its internal resistance is low, power density is high, high its superiority that more makes of specific energy is outstanding.The lamination electricity core of this laminated type lithium-ion-power cell includes negative plate, positive plate and insulation diaphragm, these negative plates, positive plate and insulation diaphragm be order flat putting and after stacking together layer by layer one by one in accordance with regulations, top negative electrode lug all is connected all negative plates by fixture with the negative lug joint, top anode ear all is connected all positive plates by fixture with the positive pole ear joint, negative lug joint and positive pole ear joint stretch out shell more respectively then.Present this laminated type lithium-ion-power cell exists following defective: (1), processing technology complexity, cost height.Because negative lug joint and positive pole ear joint generally are positioned at the centre position, top of lamination electricity core, because lamination electricity core has certain thickness, therefore the distance of every negative plate and negative lug joint is unequal, and the distance of every positive plate and positive pole ear joint also is unequal.So just make that the lengthwise position of the negative electrode lug on the negative plate that fixture connects is inequality, therefore cause long apart from the negative electrode lug longitudinal length on the negative plate of negative lug joint distance, and it is short apart from the negative electrode lug longitudinal length on the near negative plate of negative lug joint distance, and positive plate also exists same problem on connecting, feasible long apart from the anode ear longitudinal length on the positive plate of positive pole ear joint distance, and short apart from the anode ear longitudinal length on the near positive plate of positive pole ear joint distance.This just makes that the negative electrode lug length on each piece negative plate is all inconsistent, and the anode ear length on each piece positive plate is also all inconsistent.Therefore caused great difficulty for the processing of positive plate and negative plate, make the processing technology complexity of lithium-ion-power cell, processing cost is high, has caused the increase of lithium-ion-power cell cost; (2) cycle life shortens, and fail safe reduces.Heat on existing lithium ion power cell cathode sheet and the positive plate, be delivered on negative lug joint and the positive pole ear joint, then heat is distributed, because negative plate only contacts with the negative lug joint, positive plate only contacts with the positive pole ear joint, so the thermal-arrest heat conduction function of negative lug joint and positive pole ear joint is bad, cause the lithium-ion-power cell heating easily, influenced the performance of lithium-ion-power cell widely, its cycle life is shortened, fail safe reduces; (3), influence good looking appearance and stability.Negative electrode lug is different in size on the existing negative plate, anode ear is also different in size on the positive plate, present way is after negative plate and positive plate fix with negative lug joint and positive pole ear joint respectively, top lug different in size is had one's hair trimmed, the defective that such way is brought is to be difficult to be cut into unanimity on the one hand, influence the attractive in appearance of profile, on the other hand because negative electrode lug and anode ear are different in size, and positive plate and negative plate are baffle is heat carrier, this just causes the inconsistent of projected current and heat conduction on positive plate and the negative plate, thereby the stability of lithium-ion-power cell is reduced.

Summary of the invention

The lithium-ion-power cell that the purpose of this utility model provides that a kind of processing technology is simple, cost is low, has extended cycle life, security and stability is high.

The technical scheme that realizes above-mentioned purpose is: a kind of lithium-ion-power cell, comprise shell and lamination electricity core, shell is encapsulated in the outside of lamination electricity core, shell is provided with breach, breach includes installing port and liquid injection port, negative lug joint and positive pole ear joint are fixed on the shell, negative lug joint top is negative terminals, positive pole ear joint top is positive terminal, negative terminals and positive terminal stretch out housing exterior by the installing port on the breach, lamination electricity core includes negative plate, positive plate and insulation diaphragm, negative plate and positive plate are successively alternately, separate by insulation diaphragm between negative plate and the positive plate, the outside of outermost layer pole piece also is provided with insulation diaphragm, two ends, the left and right sides all with negative plate as the outermost layer pole piece, all negative plates all are connected with the negative lug joint by fixture, all positive plates all are connected with the positive pole ear joint by fixture, the both sides of negative lug joint bottom are provided with the lug clamping plate, negative plate is connected with the negative lug joint by the fixture that is through on the lug clamping plate, the both sides of positive pole ear joint bottom also are provided with the lug clamping plate, positive plate is connected with the positive pole ear joint by the fixture that is through on the lug clamping plate, all negative plate shapes are identical, and all positive plate shapes are identical.

Further, described negative plate is clipped between two lug clamping plate, and positive plate is clipped between two lug clamping plate, has the through hole that allows fixture pass on the lug clamping plate.

Further, described lug clamping plate are rectangle.

Further, film and a slice Copper Foil that described negative plate is made by two graphite materials are formed, and Copper Foil is clamped between the film that two graphite materials make, and as negative electrode lug, and have the hole that allows fixture pass on this negative electrode lug on the Copper Foil.

Further, film and a slice aluminium foil that described positive plate is made by two LiFePO 4 materials are formed, and aluminium foil is clamped between the film that two LiFePO 4 materials make, and as anode ear, and have the hole that allows fixture pass on this anode ear on the aluminium foil.

Further, described insulation diaphragm is made up of the film of two PP material and the film of a slice PE material, and the film of PE material is clamped between the film of two PP material.

Further, described shell is that stainless steel material is made.

Further, the two ends up and down of described shell are installed with the battery case insulating case.

Further, described shell includes casing and cover plate, breach is opened on the cover board, breach also includes venting, post the safety anti-explosive film on the venting, the electronic mounting plate is housed below the cover plate, has down breach on the electronic mounting plate with on the corresponding position of breach, following breach includes location and installation mouth, fluid injection port and explosion-proof through hole.

Further, described safety anti-explosive film is a copper film.

After adopting technique scheme, have a lot of benefits: (1), processing technology are simple, and cost is low.The utility model design is ingenious, just can be by the lug clamping plate by fixture with negative plate and positive plate clamping position in regulation, be that the lug clamping plate make that the lengthwise position of the negative electrode lug on the negative plate that fixture connects is identical, the lengthwise position of the anode ear on the positive plate that fixture connects is also identical, therefore negative electrode lug length is identical, anode ear length is identical, and all like this negative plate shapes are identical, and all positive plate shapes are identical.Above-mentioned improvement has brought negative plate and positive plate processing to be very easy to, and processing technology is simple, convenient, and the process-cycle is short, greatly reduces cost of the present utility model; (2) have extended cycle life, safe.Owing to increased the lug clamping plate, heat on the utility model negative plate and the positive plate, just be delivered on negative lug joint and the positive pole ear joint by the lug clamping plate, then heat is distributed, because the lug clamping plate have good heat collection function, therefore increased the thermal-arrest heat conduction function of negative lug joint and positive pole ear joint greatly, the heat that negative lug joint and positive pole ear joint are derived distributes rapidly, thereby the utility model is difficult for heating, improved performance of the present utility model greatly, its cycle life is prolonged, and fail safe improves; (3), good looking appearance, good stability.The utility model negative plate shape is identical, the positive plate shape is identical, good looking appearance, and because negative electrode lug is consistent with anode ear length, make on positive plate and the negative plate uniformity by lug clamping plate projected current and heat conduction, thereby stability of the present utility model is improved greatly.

Description of drawings

Fig. 1 is a main TV structure schematic diagram of the present utility model;

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

Fig. 3 is the left view of Fig. 1;

Fig. 4 is the A-A profile of Fig. 1;

Fig. 5 is the B-B profile of Fig. 1;

Fig. 6 is the internal structure schematic diagram that removes part 1 shell and part 4 electronic mounting plates etc.;

Fig. 7 is part 9 negative plate structural representations;

Fig. 8 is part 10 positive plate structural representations;

Fig. 9 is part 7 insulation diaphragm structural representations;

Figure 10 is the J-J cutaway view of Fig. 7;

Figure 11 is the K-K cutaway view of Fig. 8;

Figure 12 is the L-L profile of Fig. 9;

Figure 13 is the structural representation of part 21 negative lug joints and part 22 positive pole ear joints;

Figure 14 is the structural representation of part 27 lug clamping plate;

Figure 15 is the structural representation of part 26 battery case insulating cases;

Figure 16 is part 1 shell upper part spare 3 structure of cover plate schematic diagrames;

Figure 17 is the structural representation of part 4 electronic mounting plates;

Figure 18 is the structural representation of part 1 shell lower face bulk-breaking 2 casings.

Embodiment

Below in conjunction with drawings and Examples the utility model is described in further detail.

To shown in Figure 180, a kind of lithium-ion-power cell comprises shell 1, electronic mounting plate 4 and lamination electricity core 16, also includes the negative lug joint 21 of copper material making and the positive pole ear joint 22 that aluminium is made, and also includes rectangular lug clamping plate 27 as Fig. 1.Shell 1 adopts stainless steel material to make, heat radiation and anticorrosion effect are better like this, and shell 1 is encapsulated in the outside of electronic mounting plate 4 and lamination electricity core 16, and shell 1 includes casing 2 and cover plate 3, electronic mounting plate 4 is housed below the cover plate 3, and electronic mounting plate 4 is made by insulating material.Shell 1 is provided with breach 17, breach 17 is opened on cover plate 3, breach 17 includes two installing port 17-1 and a liquid injection port 17-2 and a venting 17-3, post the safety anti-explosive film 19 that copper film is made on the venting 17-3, have down breach 18 on the electronic mounting plate 4 with on the breach 17 corresponding positions, following breach 18 includes two location and installation mouth 18-1 and a fluid injection port 18-2 and an explosion-proof through hole 18-3.Liquid injection port 17-2 opens the side at cover plate 3, venting 17-3 opens in cover plate 3 central authorities, liquid injection port 17-2 opens in venting 17-3 both sides, liquid injection port 17-2 is just in time corresponding with fluid injection port 18-2 position, substitute the bad for the good in the shell 1 behind the electrolyte, rivet 23 rivetings are gone in the liquid injection port 17-2 above the fluid injection port 18-2 to seal.All have boss 4-1 above two location and installation mouth 18-1, two installing port 17-1 of the breach 17 on the cover plate 3 are enclosed within boss 4-1 outside.Negative lug joint 21 tops are the sub-21-1 of negative terminals, positive pole ear joint 22 tops are the sub-22-1 of positive terminal, all has external screw thread on sub-21-1 of negative terminals and the sub-22-1 of positive terminal, negative lug joint 21 bottoms have the connecting hole 21-2 that connects negative electrode lug 9-1-1, positive pole ear joint 22 bottoms have the connecting hole 22-2 that connects anode ear 10-1-1, sub-21-1 of negative terminals and the sub-22-1 of positive terminal stretch out the installing port 17-1 outside of shell 1 by the location and installation mouth 18-1 on the electronic mounting plate 4, on sub-21-1 of negative terminals and the sub-22-1 of positive terminal, put insulating washer 24 respectively, and screw on hold-down nut 25 and fix.Negative lug joint 21 and positive pole ear joint 22 are fixed on the cover plate 3 of shell 1.Lamination electricity core 16 includes negative plate 9, positive plate 10 and insulation diaphragm 7, negative plate 9 and positive plate 10 are successively alternately, separate by insulation diaphragm 7 between negative plate 9 and the positive plate 10, the outside of outermost layer pole piece also is provided with insulation diaphragm 7, two ends, the left and right sides all with negative plate 9 as the outermost layer pole piece, promptly according to insulation diaphragm 7, negative plate 9, insulation diaphragm 7, positive plate 10, insulation diaphragm 7, negative plate 9, insulation diaphragm 7, positive plate 10, insulation diaphragm 7...... insulation diaphragm 7, negative plate 9, insulation diaphragm 7 is arranged, with insulation diaphragm 7, negative plate 9 and positive plate 10 press said sequence stacked layer by layer good after, adhesive tape 5 is wrapped in the outside, will expose negative electrode lug 9-1-1 and the anode ear 10-1-1 above the positive plate 10 above the negative plate 9 during bag.The both sides of negative lug joint 21 bottoms are provided with lug clamping plate 27, have the through hole 27-1 that allows fixture 20 pass on the lug clamping plate 27, negative plate 9 is clipped between the lug clamping plate 27, positive plate 10 is clipped between the lug clamping plate 27, all negative plates 9 are all by being through the fixture 20 and negative lug joint 21 Joints on the lug clamping plate 27, the both sides of positive pole ear joint 22 bottoms also are provided with lug clamping plate 27, all positive plates 10 are all by being through the fixture 20 and positive pole ear joint 27 Joints on the lug clamping plate 27, all negative plate 9 shapes are identical, and all positive plate 10 shapes are identical.Described fixture 20 is a set bolt.

As Fig. 4 and shown in Figure 10, film 9-2 and a slice Copper Foil 9-1 that described negative plate 9 is made by two graphite materials form, Copper Foil 9-1 is clamped between the film 9-2 of two graphite materials making, Copper Foil 9-1 upper end is as negative electrode lug 9-1-1, and has the hole 9-3 that allows fixture 20 pass on this negative electrode lug 9-1-1.A plurality of negative electrode lug 9-1-1 stack and form the negative electrode lug group, and fixture 20 is fixed together lug clamping plate 27, negative electrode lug group and negative lug joint 21 by hole 9-3 and connecting hole 21-2 and through hole 27-1.Heat on the negative plate 9 and electric current are directly passed to negative lug joint 21 by negative electrode lug group, lug clamping plate 27 and fixture 20 set bolts, and heat distributes in time by lug clamping plate 27 and negative lug joint 21.

As Fig. 5 and shown in Figure 11, film 10-2 and a slice aluminium foil 10-1 that described positive plate 10 is made by two LiFePO 4 materials form, aluminium foil 10-1 is clamped between the film 10-2 of two LiFePO 4 materials making, aluminium foil 10-1 upper end is as anode ear 10-1-1, and has the hole 10-3 that allows fixture 20 pass on this anode ear 10-1-1.A plurality of anode ear 10-1-1 stack and form the anode ear group, and fixture 20 is fixed together lug clamping plate 27, anode ear group and positive pole ear joint 22 by hole 10-3 and connecting hole 22-2 through hole 27-1.Heat on the positive plate 10 and electric current are directly passed to positive pole ear joint 22 by anode ear group, lug clamping plate 27 and fixture 20 set bolts, and heat distributes in time by lug clamping plate 27 and positive pole ear joint 22.

As shown in figure 12, described insulation diaphragm 7 is made up of the film 7-2 of two PP material and the film 7-1 of a slice PE material, and the film 7-1 of PE material is clamped between the film 7-2 of two PP material.

As Fig. 1, Fig. 2 and shown in Figure 15, the two ends up and down of shell 1 are installed with battery case insulating case 26, and battery case insulating case 26 is made by insulating material.Battery case insulating case 26 is detachable.

Electronic mounting plate 4 also has supporting role to shell 1 in the utility model except that having insulating effect, makes shell 1 more firm, and the antidetonation resistance to compression makes the negative lug joint 21 and the positive pole ear joint 22 that are fixed on the cover plate 3 more firm.In addition to the implementation, electronic mounting plate 4 of the present utility model also can adopt two insulating washers to replace, an insulating washer pad is between cover plate 3 installing port 17-1 and negative lug joint 21, and another insulating washer pad is between cover plate 3 installing port 17-1 and positive pole ear joint 22.

A plurality of the utility model can be combined into the lithium-ion-power cell group and use, to improve the power of lithium-ion-power cell.When a plurality of the utility model are combined into the use of lithium-ion-power cell group, battery case insulating case 26 can play the effect of insulation, can make again remain between a plurality of shells of the present utility model 1 gapped, help the heat radiation, improve the life-span that recycles of the present utility model.When single the utility model used, battery case insulating case 26 can remove or not adorn.

The utility model is not limited to the foregoing description, and the technical scheme that all employings are equal to replacement or equivalence replacement formation all belongs to the claimed scope of the utility model.

Claims

1, a kind of lithium-ion-power cell, comprise shell (1) and lamination electricity core (16), shell (1) is encapsulated in the outside of lamination electricity core (16), shell (1) is provided with breach (17), breach (17) includes installing port (17-1) and liquid injection port (17-2), negative lug joint (21) and positive pole ear joint (22) are fixed on the shell (1), negative lug joint (21) top is negative terminals (21-1), positive pole ear joint (22) top is positive terminal (22-1), negative terminals (21-1) and positive terminal (22-1) stretch out shell (1) outside by the installing port (17-1) on the breach (17), lamination electricity core (16) includes negative plate (9), positive plate (10) and insulation diaphragm (7), negative plate (9) and positive plate (10) are successively alternately, separate by insulation diaphragm (7) between negative plate (9) and the positive plate (10), the outside of outermost layer pole piece also is provided with insulation diaphragm (7), two ends, the left and right sides all with negative plate (9) as the outermost layer pole piece, all negative plates (9) all are connected with negative lug joint (21) by fixture (20), all positive plates (10) all are connected with positive pole ear joint (22) by fixture (20), it is characterized in that: the both sides of negative lug joint (21) bottom are provided with lug clamping plate (27), negative plate (9) is connected with negative lug joint (21) by the fixture (20) that is through on the lug clamping plate (27), the both sides of positive pole ear joint (22) bottom also are provided with lug clamping plate (27), positive plate (10) is connected with positive pole ear joint (27) by the fixture (20) that is through on the lug clamping plate (27), all negative plates (9) shape is identical, and all positive plates (10) shape is identical.

2, lithium-ion-power cell according to claim 1, it is characterized in that: described negative plate (9) is clipped between the lug clamping plate (27), positive plate (10) is clipped between the lug clamping plate (27), has the through hole (27-1) that allows fixture (20) pass on the lug clamping plate (27).

3, lithium-ion-power cell according to claim 1 is characterized in that: described lug clamping plate (27) are rectangle.

4, lithium-ion-power cell according to claim 1, it is characterized in that: film (9-2) and a slice Copper Foil (9-1) that described negative plate (9) is made by two graphite materials are formed, Copper Foil (9-1) is clamped between the film (9-2) of two graphite materials making, Copper Foil (9-1) upper end is as negative electrode lug (9-1-1), and has the hole (9-3) that allows fixture (20) pass on this negative electrode lug (9-1-1).

5, lithium-ion-power cell according to claim 1, it is characterized in that: film (10-2) and a slice aluminium foil (10-1) that described positive plate (10) is made by two LiFePO 4 materials are formed, aluminium foil (10-1) is clamped between the film (10-2) of two LiFePO 4 materials making, aluminium foil (10-1) upper end is as anode ear (10-1-1), and has the hole (10-3) that allows fixture (20) pass on this anode ear (10-1-1).

6, lithium-ion-power cell according to claim 1, it is characterized in that: described insulation diaphragm (7) is made up of the film (7-2) of two PP material and the film (7-1) of a slice PE material, and the film of PE material (7-1) is clamped between the film (7-2) of two PP material.

7, lithium-ion-power cell according to claim 1 is characterized in that: described shell (1) is made for stainless steel material.

8, lithium-ion-power cell according to claim 1 is characterized in that: the two ends up and down of described shell (1) are installed with battery case insulating case (26).

9, lithium-ion-power cell according to claim 1, it is characterized in that: described shell (1) includes casing (2) and cover plate (3), breach (17) is opened on cover plate (3), breach (17) also includes venting (17-3), post safety anti-explosive film (19) on the venting (17-3), electronic mounting plate (4) is housed below the cover plate (3), electronic mounting plate (4) upward and on the corresponding position of breach (17) has down breach (18), and following breach (18) includes location and installation mouth (18-1), fluid injection port (18-2) and explosion-proof through hole (18-3).

10, lithium-ion-power cell according to claim 9 is characterized in that: described safety anti-explosive film (19) is a copper film.