CN101635371B

CN101635371B - Lithium-ion power battery

Info

Publication number: CN101635371B
Application number: CN200910032834XA
Authority: CN
Inventors: 周金平
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-06-04
Filing date: 2009-06-04
Publication date: 2011-04-27
Anticipated expiration: 2029-06-04
Also published as: CN101635371A

Abstract

The invention relates to a lithium-ion power battery, comprising a laminated battery cell (16). The laminated battery cell (16) comprises negative pole pieces (9), positive pole pieces (10) and insulating diaphragms (7), wherein, the negative pole pieces (9) and the positive pole pieces (10) are sequentially arrayed at intervals. The invention also comprises two side plywood (5) and positioning columns (11), wherein, the two side plywood (5) is used for clamping the negative pole pieces (9), the positive pole pieces (10) and the insulating diaphragms (7) and is provided with positioning holes (5-1); connecting holes (19) matching the positions of the positioning holes (5-1) are arranged on the insulating diaphragms (7), the negative pole pieces (9) and the positive pole pieces (10); the positioning columns (11) pass through the connecting holes (19) on the negative pole pieces (9), the positive pole pieces (10) and the insulating diaphragms (7) to be fixedly connected with the side plywood (5) at both ends in the positions of the positioning holes (5-1). The lithium-ion power battery has good capability of resisting shock and extrusion, is not easy to bulge and has long cycle life.

Description

Lithium-ion-power cell

Technical field

The present invention relates to a kind of rechargeable battery, 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, negative plate and positive plate are successively alternately, separate by insulation diaphragm between negative plate and the positive plate, the arranged outside of outermost layer negative plate has insulation diaphragm, these negative plates, positive plate and insulation diaphragm are according to above-mentioned described ordering flat putting and stacking together layer by layer one by one, then generally they are wrapped as whole bag printing paper with adhesive tape, but expose top negative electrode lug and anode ear, therefore electric core also is lamination electricity core.Present this laminated type lithium-ion-power cell exists following defective: (1), antidetonation and anti-extrusion capability are poor.No matter be to be placed in the shell after circle or square lamination electricity core is wrapped, because unfixing and support, protectiveness is poor, so easy in the enclosure play of lamination electricity core, antidetonation and anti-extrusion capability are poor, cause the damage of lithium-ion-power cell easily, thereby make it recycle the lost of life; (2), easily expand, security risks is big.Because after the lithium-ion-power cell fluid injection and changing into, owing to produce to expand and charge behind the lamination electricity core material Electolyte-absorptive and change into the gas of generation, lithium-ion-power cell is produced to expand, because the pressure that the rectangular cell shell does not resemble around the circular housing is uniformity, middle meeting produces serious bulge, though not resembling, circular housing do not produce serious bulge the square shell, but also exist the risk and the possibility of bulge, and the bulge meeting is increased the internal resistance of battery intermediate drum packet portion and is produced heating, further cause the electrolyte evaporation, make the capacitance loss of bulge part, even cause capacity to be decayed in early days, thus its cycle life is shortened greatly, even bring damage to battery, also have the possibility of blast when serious, bring hidden danger.

Summary of the invention

The purpose of this invention is to provide a kind of antidetonation and anti-extrusion capability good, be difficult for the lithium-ion-power cell that bulge, protectiveness are good, have extended cycle life.

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, also include the clamping negative plate, two side clamping plate of positive plate and insulation diaphragm, also include negative plate with lamination electricity core, the reference column that insulate between positive plate and the insulation diaphragm, have location hole on the clamping plate of side, at insulation diaphragm, all have the connecting hole that is complementary with position of positioning hole on negative plate and the positive plate, reference column passes negative plate, connecting hole on positive plate and the insulation diaphragm, with the side faces at both ends clamping plate at location hole place Joint.

Further, described side clamping plate and shell are at location hole place Joint.

Further, described shell and side clamping plate are stainless steel material and make, and reference column also is a stainless steel material, and insulating sleeve is equipped with in the reference column outside of stainless steel material.

Further, described reference column is the punching rivet.

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, 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, negative plate, positive plate and the insulation diaphragm of lamination electricity core of the present invention are clamped between two side clamping plate, reference column passes the connecting hole on negative plate, positive plate and the insulation diaphragm, with the side faces at both ends clamping plate at location hole place Joint, add side clamping plate and shell especially at location hole place Joint, make lamination electricity core of the present invention and shell combine together, this has just brought following benefit: (1), antidetonation and anti-extrusion capability are good.Because the support of reference column is arranged, the fixedly protection of side clamping plate is arranged, this just makes that the antidetonation and the anti-extrusion capability of lamination electricity core of the present invention are good, lamination electricity core in the enclosure can play, makes antidetonation of the present invention and anti-extrusion capability stronger.Therefore protectiveness of the present invention is good, and it is long to recycle the life-span; (2), be difficult for to expand, fail safe is good.Adopt the square shell lithium-ion-power cell performance that makes of the present invention fully near the circular housing battery, make square shell pressure uniformity all around, solved the difficult problem of bulge in the prior art, and that the circular housing battery adopts this method also the risk of its bulge to be reduced to is lower, almost nil risk.And the shell centre does not produce bulge, therefore can not cause the present invention to generate heat, keep capacity of the present invention early stage decay can not take place, thereby its cycle life is prolonged greatly, and avoided the battery that brings because of heating to damage or the generation of other dangerous phenomenon, fail safe is good; (3), protective is good.Side of the present invention clamping plate are at location hole place Joint, side clamping plate and shell are also at location hole place Joint, the binding site attenuation of fixing position, security performance of the present invention is good, in case make lithium-ion-power cell because of short circuit just in case go wrong, the high pressure gas that produces before blast is so known from experience makes the expanded effect of air pressure of side clamping plate and shell binding site, at first reference column is broken, the location hole that exposes the binding site place loses heart, and avoids the generation of exploding.Therefore the location hole at side clamping plate and shell binding site place has played the effect of safety valve, so barrier propterty of the present invention is good, and fail safe is higher.

Description of drawings

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

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 C-C cutaway view of Fig. 1;

Fig. 7 is the D portion enlarged drawing of Fig. 6;

Fig. 8 is the internal structure schematic diagram that removes part 1 shell and part 4 electronic mounting plates etc.;

Fig. 9 is part 5 side clamp region schematic diagrames;

Figure 10 is part 9 negative plate structural representations;

Figure 11 is part 10 positive plate structural representations;

Figure 12 is part 7 insulation diaphragm structural representations;

Figure 13 is the J-J cutaway view of Figure 10;

Figure 14 is the K-K cutaway view of Figure 11;

Figure 15 is the L-L profile of Figure 12;

Figure 16 is the structural representation of part 21 negative lug joints and part 22 positive pole ear joints;

Figure 17 is the structural representation of part 11 reference columns;

Figure 18 is the structural representation of part 12 insulating sleeves;

Figure 19 is the structural representation of part 26 battery case insulating cases;

Figure 20 is part 1 shell upper part spare 3 structure of cover plate schematic diagrames;

Figure 21 is the structural representation of part 4 electronic mounting plates;

Figure 22 is the structural representation of part 1 shell lower face bulk-breaking 2 casings.

Embodiment

The present invention is further detailed explanation below in conjunction with drawings and Examples.

Extremely shown in Figure 22 as Fig. 1, a kind of lithium-ion-power cell, comprise shell 1, electronic mounting plate 4 and lamination electricity core 16, also include the negative lug joint 21 of copper material making and the positive pole ear joint 22 that aluminium is made, also include negative plate 9 with lamination electricity core 16, the reference column 11 of insulation between positive plate 10 and the insulation diaphragm 7, reference column 11 is made by the punching rivet, the big two ends of punching rivet intermediate outer external diameter is little, reference column 11 is provided with three, also include three insulating sleeves 12, reference column 11 is a stainless steel material, also include two side clamping plate 5, shell 1 is stainless steel material with side clamping plate 5 and makes, and uses the shell 1 and the side clamping plate 5 of stainless steel material, more help heat radiation, and anticorrosion effect is better.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 electronic mounting plate 4.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, all negative plates 9 are all by fixture 20 and negative lug joint 21 Joints, all by fixture 20 and positive pole ear joint 22 Joints, described fixture 20 is a set bolt to all positive plates 10.Two side clamping plate 5 are clamped in the outside of negative plate 9, positive plate 10 and the insulation diaphragm 7 arranged by above-mentioned order, on two side clamping plate 5, respectively have three location hole 5-1, location hole 5-1 leaves easy bulge position in the middle of side clamping plate 5, on insulation diaphragm 7, negative plate 9 and positive plate 10, all have three connecting holes 19 that are complementary with three location hole 5-1 positions, connecting hole 19 is a circular hole, and the size of connecting hole 19 is identical with the external diameter of insulating sleeve 12 with shape.The reference column 11 that insulating sleeve 12 is housed passes the connecting hole 19 on negative plate 9, positive plate 10 and the insulation diaphragm 7, with side faces at both ends clamping plate 5 at location hole 5-1 place by the riveted joint Joint.Described side clamping plate 5 with shell 1 at location hole 5-1 place by outside spot welding Joint.

As Fig. 4 and shown in Figure 13, 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 negative electrode lug group and negative lug joint 21 by hole 9-3 and connecting hole 21-2.Heat on the negative plate 9 and electric current are directly passed to negative lug joint 21 by negative electrode lug group and fixture 20 set bolts, and heat distributes in time by negative lug joint 21.

As Fig. 5 and shown in Figure 14, 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 anode ear group and positive pole ear joint 22 by hole 10-3 and connecting hole 22-2.Heat on the positive plate 10 and electric current are directly passed to positive pole ear joint 22 by anode ear group and fixture 20 set bolts, and heat distributes in time by positive pole ear joint 22.

As shown in figure 15, 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 19, 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.

In addition to the implementation, shell 1 of the present invention and two side clamping plate 5 also can adopt plastic material to make, and reference column 11 also can adopt plastic material to make, and does not at this moment just need to use insulating sleeve 12.Electronic mounting plate 4 also has supporting role to shell 1 among the present invention 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.Novel electronic mounting panel 4 of the present invention also can adopt two insulating washers to replace, and 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 present invention 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 present invention are combined into the lithium-ion-power cell group when using, battery case insulating case 26 can play the effect of insulation, can make again to remain gappedly between a plurality of shells of the present invention 1, helps heat radiation, improves the life-span that recycles of the present invention.When single the present invention used, battery case insulating case 26 can remove or not adorn.

The invention is not restricted to the foregoing description, the technical scheme that all employings are equal to replacement or equivalence replacement formation all belongs to the scope of protection of present invention.

Claims

1. 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: also include clamping negative plate (9), two side clamping plate (5) of positive plate (10) and insulation diaphragm (7), also include negative plate (9) with lamination electricity core (16), the reference column (11) of insulation between positive plate (10) and the insulation diaphragm (7), have location hole (5-1) on the side clamping plate (5), in insulation diaphragm (7), all have the connecting hole (19) that is complementary with location hole (5-1) position on negative plate (9) and the positive plate (10), reference column (11) passes negative plate (9), connecting hole (19) on positive plate (10) and the insulation diaphragm (7) is located Joint with side faces at both ends clamping plate (5) at location hole (5-1).

2. lithium-ion-power cell according to claim 1 is characterized in that: described side clamping plate (5) are located Joint with shell (1) at location hole (5-1).

3. lithium-ion-power cell according to claim 1, it is characterized in that: described shell (1) is stainless steel material with side clamping plate (5) and makes, reference column (11) also is a stainless steel material, and insulating sleeve (12) is equipped with in the reference column of stainless steel material (11) outside.

4. lithium-ion-power cell according to claim 1 is characterized in that: described reference column (11) is the punching rivet.

5. 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).

6. 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).

7. 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.

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.