CN218525646U - Large-size ultrathin square-shaped polymer power battery - Google Patents

Abstract

The application relates to a large-size ultrathin square-shaped polymer power battery, which comprises a battery shell, battery cover plates arranged on two sides of the battery shell and a battery cell arranged in the battery shell; the battery shell comprises two shell units which are symmetrically arranged, each shell unit comprises a bottom plate, vertical plates fixedly connected to two sides of the bottom plate and extension plates fixedly connected to one ends of the vertical plates far away from the bottom plate, the two shell units are combined to form a containing cavity for containing a battery cell, and the extension plates between the two shell units are abutted in pairs and are welded and fixed; the battery cover plate is provided with two battery cover plates which are respectively positioned at two openings of two ends of the accommodating cavity, the battery cover plate comprises a cover plate body which is embedded in the accommodating cavity, the peripheral part of the cover plate body is provided with a welding ring on the outer wall of the cover plate body, the welding ring is used for abutting against the inner wall of the accommodating cavity, and the welding ring is fixedly connected to the shell unit through welding. By adopting the technical scheme, the large-size battery in any direction can be manufactured, the monomer capacity of the battery is improved, and various use requirements are met.

Description

Large-size ultrathin square-shaped polymer power battery

[ technical field ] A

The application relates to a large-size ultrathin square-shaped polymer power battery, and belongs to the technical field of power batteries.

[ background ] A method for producing a semiconductor device

Among the existing power batteries, there are three types of conventional soft package batteries, square-shell batteries and cylindrical batteries. Wherein the soft package battery can be thinner and 5mm-12mm in thickness. Rather than conventional batteries such as blade batteries. The aluminum foil is packaged by a traditional aluminum shell, the length direction is about 1000mm, the width direction is about 120mm, the thickness is about 10mm, and the aluminum foil is long-strip-shaped and is in the form of a blade. Because the monomer specific energy of blade battery is high, the radiating effect is good, space utilization is high, therefore blade battery uses under the discharge mode of high specific energy, high multiplying power and has more and more markets.

Although the blade battery is made as thin as possible and large, the existing blade battery cannot be made into any large size in the width direction. Other traditional batteries can only be up to A4 paper, and the thickness is generally 9mm-15mm. Because the conventional battery case is manufactured through a drawing process, i.e., a sheet material is directly drawn and pressed until the sheet material becomes a box structure with one end open, as shown in fig. 1.

The punching is generally carried out by adopting a manganese-aluminum plate with the thickness of 1.5mm, and the punching depth can only reach 288mm-300mm. If the size of the battery is too large, the stamping depth is too large, so that the process cannot be smoothly completed. The inability to make large batteries results in limited battery capacity. The maximum cell capacity of the battery can now be made to 350ah. If the single capacity of the battery in the use scene needs to reach 1000-2000 ah, such as a large photovoltaic power storage station, the capacity of the battery is too small.

Accordingly, there is a need for improvements in the art that overcome the deficiencies in the prior art.

[ Utility model ] content

The application aims to provide a large-size battery to meet subsequent use requirements.

The purpose of the application is realized by the following technical scheme: a large-size ultrathin square high-polymer power battery comprises a battery shell, battery cover plates arranged on two sides of the battery shell and a battery cell arranged in the battery shell;

the battery shell comprises two shell units which are symmetrically arranged, each shell unit comprises a bottom plate, vertical plates fixedly connected to two sides of the bottom plate and extension plates fixedly connected to one ends of the vertical plates far away from the bottom plate, the two shell units are combined to form a containing cavity for containing a battery cell, and the extension plates between the two shell units are abutted in pairs and are welded and fixed;

the battery cover plate is provided with two battery cover plates which are respectively positioned at two openings of two ends of the accommodating cavity, the battery cover plate comprises a cover plate body which is embedded in the accommodating cavity, the peripheral part of the cover plate body is provided with a welding ring which is abutted against the inner wall of the accommodating cavity, and the welding ring is fixedly connected to the shell unit through welding.

Further, the method comprises the following steps: and the corresponding extension plates are reinforced and welded through two welding-penetration welding, wherein the welding depth of the two welding-penetration welding is 1/3-2/3 of the thickness of the extension plates.

Further: and the welding ring and the shell unit are subjected to reinforcement welding through two welding-penetration welding, wherein the welding depth of the two welding-penetration welding is 1/3-2/3 of the thickness of the shell unit.

Further: the width of the extension plate is not less than 1.5mm.

Further: the welding ring is characterized in that abutting plates used for abutting against the end wall of the battery shell are arranged on two sides of the welding ring, the abutting plates cover the extending plates, and the abutting plates are welded and fixed outside the extending plates.

Further: at least one of the bottom plates is provided with a limiting ring on one side facing inwards, and the battery core is arranged in the limiting ring and is limited by the limiting ring.

Further: the bottom plate is equipped with the insulating piece that is used for isolated electric core and bottom plate towards electric core one side.

Further: the electric core includes a plurality of anodal units and a plurality of negative pole unit, be crisscross setting between anodal unit and the negative pole unit, anodal unit includes positive plate and the anodal polymer interface management tunic that is located positive plate (26) both sides, the negative pole unit includes negative pole piece and the negative pole polymer interface management tunic that is located negative pole piece both sides.

Further: the negative plate is shorter than the positive plate in length, and the negative plate is shorter than the positive plate in width.

Further, the method comprises the following steps: the positive electrode polymer interface management layer film comprises a first nonpolar diaphragm and first positive electrode conductive polymer interface management layer films positioned on two sides of the first nonpolar diaphragm, and the negative electrode polymer interface management layer film comprises a second nonpolar diaphragm and second negative electrode conductive polymer interface management layer films positioned on two sides of the second nonpolar diaphragm.

Compared with the prior art, the method has the following beneficial effects: this application sets up battery case components of a whole that can function independently through adopting above-mentioned technical scheme, forms complete battery case by two housing unit concatenation welding. The whole structure of the shell unit is approximately flat, and the punching and drawing depth is small, so that the operation range is large during die casting, and the shell unit with large plane size in any direction can be manufactured. And the welding between two extension plates, the welding between extension plate and the apron body has ensured the gas tightness of whole battery for battery is whole safer. The battery cell with large size in any direction is more stable and safer to be coated in the containing cavity. Therefore, the large-size battery in any direction can be manufactured, the monomer capacity of the battery is improved, and various use requirements are met.

[ description of the drawings ]

Fig. 1 is a schematic diagram of a battery case according to the prior art.

FIG. 2 is a schematic structural view of embodiment 1.

Fig. 3 is an exploded view of the battery case and the battery cell in example 1.

Fig. 4 is a sectional view of a battery case in example 1.

Fig. 5 is a partial schematic view of a battery case in example 1.

Fig. 6 is a schematic structural view of the battery cover plate at the pole in embodiment 1.

Fig. 7 is a schematic structural view of the battery cover plate in embodiment 1.

Fig. 8 is a partial structural view of the battery cover plate in example 1.

Fig. 9 is a schematic structural view of a second insulating layer in embodiment 1.

Fig. 10 is a schematic structural view of the housing unit in embodiment 1.

Fig. 11 is an enlarged view at a in fig. 10.

Fig. 12 is a partial schematic view of the case where the stopper plate abuts against the battery lid plate in embodiment 1.

Fig. 13 is a schematic structural view of the battery cover plate at the glue injection port in embodiment 1.

Fig. 14 is a schematic structural diagram of a cell in embodiment 1.

Fig. 15 is a schematic structural view of a positive electrode unit in embodiment 1.

Fig. 16 is a schematic structural view of a positive electrode polymer interface management layer film in example 1.

Fig. 17 is a schematic view of the structure of the negative electrode unit in example 1.

Fig. 18 is a schematic view of the structure of the negative electrode polymer interface management layer film in example 1.

Fig. 19 is a process flow chart of manufacturing a positive electrode unit in example 1.

Fig. 20 is a schematic view of the thermal composite process of the positive electrode polymer interface management layer film in example 1.

Fig. 21 is a flowchart of manufacturing a negative electrode unit in example 1.

Fig. 22 is a process flow chart of manufacturing a negative electrode unit in example 1.

Fig. 23 is a schematic view of a thermal composite process of the negative polymer interface management layer film in example 1.

Fig. 24 is a schematic flow chart of a manufacturing process of the battery cell in embodiment 1.

Figure 25 is a partial schematic view of embodiment 2 at the abutment plate.

Description of the reference numerals: 1. a battery case; 2. a battery cover plate; 3. an electric core; 4. a housing unit; 5. a base plate; 6. a vertical plate; 7. an extension plate; 8. edge clamping; 9. a card slot; 10. sealing the adhesive layer; 11. a limiting plate; 12. a limiting ring; 13. an insulating sheet; 14. a cover plate body; 15. a pole column; 16. an extreme flow plate; 17. welding a ring; 18. a through groove; 19. a seal assembly; 20. an explosion-proof valve; 21. a glue injection port; 22. a rubber pad; 23. a sealing cover; 24. a positive electrode unit; 25. a negative electrode unit; 26. a positive plate; 27. a positive polymer interface management layer film; 28. a first non-polar separator; 29. a first positive conductive polymer interface management layer film; 30. a negative plate; 31. a negative polymer interface management layer film; 32. a second non-polar separator; 33. a second negative conductive polymer interface management layer film; 34. a positive electrode tab; 35. positive pole roll; 36. a positive electrode unit roll; 37. a first heating zone; 38. a second heating zone; 39. a third heating zone; 40. a positive pressure roller; 41. a negative electrode tab; 42. negative pole roll; 43. a negative electrode unit roll; 44. a fourth heating zone; 45. a fifth hot zone; 46. a sixth heating zone; 47. a negative pressure roller; 48. a seventh heating zone; 49. an eighth heating zone; 50. a ninth heating zone; 51. a butt joint plate; 61. a PP sleeve; 62. a first insulating layer; 63. a second insulating layer; 631. a copper foil layer or an aluminum foil layer; 64. a third insulating layer; 65. a first fixing plate; 66. a fourth insulating layer; 67. a fifth insulating layer; 68. and a sixth insulating layer.

[ detailed description ] A

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures associated with the present application are shown in the drawings, not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "comprising" and "having," as well as any variations thereof, in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.

Referring to fig. 1 to 7, a large-sized ultra-thin square-shaped polymer power battery according to a preferred embodiment of the present application is shown. The capacity of the battery cell can reach 500AH-2000AH, and the maximum capacity can reach 3000AH. Referring to fig. 2 and 3, the large-sized ultrathin square-shaped polymer power battery includes a battery case 1, battery cover plates 2 disposed on both sides of the battery case 1, and a battery core 3 installed in the battery case 1.

Referring to fig. 4 and 5, the battery case 1 includes two housing units 4. The housing unit 4 is in a shape of a little letter, and is in a flat sheet shape. The housing unit 4 includes a bottom plate 5, a vertical plate 6 fixedly connected to both ends of the bottom plate 5, and an extension plate 7 fixedly connected to one end of the vertical plate 6 and parallel to the bottom plate 5. The sizes of the bottom plate 5, the vertical plate 6 and the extension plate 7 can be set according to actual requirements. The shell unit 4 is formed by die-casting a manganese-aluminum thin plate with the thickness of 1-1.5mm through a die. In this example, the bottom plate 5 is 505.5mm by 740mm, the riser 6 is 12.75mm by 740mm, and the extension plate 7 is 3mm by 740mm.

During assembly, the two housing units 4 are symmetrically placed so that the extension plates 7 between the two housing units 4 abut against each other. The two extending plates 7 abutting against each other are welded at their side edges by laser welding. And then, performing two welding-fusion deep welding on the middle part of the extension plate 7, wherein the welding depth reaches the depth of the bottom plate 51/2. Thereby making the battery case 1 formed by the two case units 41 have better sealability and less susceptible to air leakage.

Referring to fig. 5, in order to further improve the sealing performance of the battery case 1 and reduce the possibility of air leakage between the two case units 4, the battery case 1 further includes two beads 8. The two extension plates welded together form an extension plate group. One clip edge 8 corresponds to one extension plate group. The clamping edge 8 is provided with a clamping groove 9 along the length direction, and the extension plate group is clamped in the clamping groove 9. A sealing glue layer 10 for sealing is arranged between the clamping edge 8 and the vertical plate 6, and the sealing glue layer 10 can be made of resin glue. The clamping edge 8 is used for stably clamping and connecting the two shell units 41 together, and the sealing glue improves the sealing property between the clamping edge 8 and the shell unit 4. Thereby finally achieving an improvement in the sealability of the battery case 1. After the clamping edge 8 is arranged on the extension plate group, the end surface of the clamping edge 8 and the bottom plate 5 are positioned on the same plane, namely the thickness of the clamping edge 8 is equal to the total thickness of the two shell units 4 welded together.

In this way, the battery case 1 for any large-sized thin battery can be manufactured. The battery shell 1 is required to be enlarged only by enlarging the bottom plate 5, the stamping depth of the shell unit 4 is not required to be very deep, the stamping process can be completely realized, the processing difficulty is small, and the processing cost is low.

Meanwhile, the conventional battery case 1 has a non-uniform thickness of the bottom plate 5 and the side plates due to a large punching depth. The stamping depth required by the case for processing the shell unit 4 is not large, so that the thicknesses of all parts of the shell unit 4 can be ensured to be the same as far as possible, and the shell unit is better adapted to various performances required by the subsequent battery shell 1, such as heat dissipation performance and the like.

Referring to fig. 6 to 9, the battery cover 2 includes a cover body 14, a terminal post 15 connected to the cover body 14, a terminal flow plate 16, and a weld ring 17 disposed along the cover body 14. The cover plate body 14 is provided with a through groove 18 for the pole 15 to pass through. The pole post 15 and the polar flow plate 16 are respectively positioned at two sides of the cover plate body 14, and the pole post 15 penetrates through the through groove 18 and is connected with the polar flow plate 16. The pole 15 is fixedly mounted on the cover plate body 14, and a space exists between two side surfaces of the pole 15 and the welding ring 17 in the width direction of the cover plate body 14.

The pole post 15 is further provided with a sealing assembly 19, and the sealing assembly 19 is connected with the pole post 15 through a hot melting welding process so as to fill the space between the two side faces of the sealed pole post 15 and the welding ring 17.

The sealing assembly 19 includes a PP sleeve 61, a first insulating layer 62, a second insulating layer 63, a third insulating layer 64 and a first fixing plate 65, the PP sleeve 61 is sleeved on the post 15, the first insulating layer 62 is sleeved on one side of the PP sleeve 61 away from the current plate 16, the second insulating layer 63 is sleeved on the PP sleeve 61 and connected to the first insulating layer 62 so as to be connected to the second insulating layer 63 in a state that the first insulating layer 62 is partially melted, and thus the first insulating layer 62 and the second insulating layer 63 are fixedly connected after the first insulating layer 62 is completely cured. The third insulating layer 64 is sleeved on the PP sleeve 61 and connected with the second insulating layer 63, and similarly, the third insulating layer 64 is connected with the second insulating layer 63 in a partially melted state, so that the third insulating layer 64 and the second insulating layer 63 are fixedly connected after the third insulating layer 64 is completely solidified. First fixed plate 65 then sets up between the gap of utmost point post 15 and apron body 14, interference fit is in order to fill the gap between first fixed plate 65 and the utmost point post 15, and it is fixed with first fixed plate 65 and utmost point post 15 to carry out laser welding through laser welding process simultaneously for first fixed plate 65 and third insulating layer 64 are connected more firmly, and hot melt between first fixed plate 65 and the third insulating layer 64 is connected. In the present embodiment, the material of the PP sleeve 61 is polypropylene (modified PP), the materials of the first insulating layer 62 and the third insulating layer 64 are both polypropylene (modified PP), and the material of the second insulating layer 63 is insulating ceramic. Polypropylene is a semicrystalline material which is harder and has a higher melting point than PE (polyethylene), and modified PP does not have the problem of environmental stress cracking. Typically, PP is modified by the addition of glass fibers, metal additives or thermoplastic rubbers.

The insulating ceramic comprises a body part and a copper foil layer 631 or an aluminum foil layer 631 coated on the outer surface of the body part, namely, the two surfaces of the insulating ceramic can be coated with copper foil or aluminum foil. The purpose of this is to: the insulating ceramic and the polypropylene can be fixedly connected through a hot-melt welding process, and meanwhile, gaps can be prevented from appearing between the insulating ceramic and the polypropylene, so that the sealing performance of the power battery cover plate is guaranteed.

The sealing assembly 19 further includes a fourth insulating layer 66 disposed on a side of the PP sleeve 61 close to the current plate 16, a fifth insulating layer 67 disposed on the PP sleeve 61 and connected to the fourth insulating layer 66, and a sixth insulating layer 68 disposed on the PP sleeve 61 and connected to the fifth insulating layer 67. Similarly, in order to further increase the sealing performance of the whole power battery cover plate, the pole post 15, the PP sleeve 61, the fourth insulating layer 66, the fifth insulating layer 67 and the sixth insulating layer 68 are connected by a hot-melt welding process.

In the present embodiment, the material of the fourth insulating layer 66 and the sixth insulating layer 68 is polypropylene, and the material of the fifth insulating layer 67 is insulating ceramic. That is, in the present embodiment, the fourth insulating layer 66 and the sixth insulating layer 68 have the same structure as the first insulating layer 62 and the third insulating layer 64, and the fifth insulating layer 67 has the same structure as the third insulating layer 64, which is not described herein again. The connection manner between the fourth insulating layer 66, the fifth insulating layer 67, and the sixth insulating layer 68 is the same as the connection manner between the first insulating layer 62, the second insulating layer 63, and the third insulating layer 64, which is not described herein again.

Referring to fig. 6, the width of the solder ring 17 can be designed according to the actual soldering requirement, and in this embodiment, the width of the solder ring 17 is 2.5mm. Referring to fig. 10 and 11, in order to facilitate the installation of the cover plate body 14, a limiting plate 11 is disposed on the inward side of the bottom plate 5, and the limiting plate 11 and the bottom plate 5 are integrally die-cast. Referring to fig. 12, when the cover body 14 is inserted into the battery case 1, the cover body 14 abuts against the stopper plate 11, and the outer end surface of the welding ring 17 is located at the same level as the end wall of the battery case 1.

Referring to fig. 6, the cover plate body 14 is provided with a glue injection port 21 and an explosion-proof valve 20, and the glue injection port 21 and the explosion-proof valve 20 are respectively located on two sides of the pole 15. Referring to fig. 13, a rubber gasket 22 for sealing the glue injection port 21 is provided on the glue injection port 21. And a sealing cover 23 is connected to the glue injection port 21 through threads.

When the cover plate and the battery shell 1 are assembled, the two battery cover plates 2 are respectively embedded into two ends of the battery shell 1 until the cover plate body 14 abuts against the limiting plate 11, and at the moment, the welding ring 17 is located on the outward side of the cover plate body 141. The welding ring 17 and the corresponding end face of the battery shell 1 are welded and fixed through laser welding, and then two welding-penetration welding is carried out at 1/2 of the welding ring 17, wherein the penetration welding depth reaches the bottom plate 51/2. Thereby improving the sealing performance between the battery cover plate 2 and the battery shell 1 and reducing the occurrence of air leakage. When the pole post 15 is installed, the pole post 15 penetrates through the through groove 18, and the pole post 15 and the pole flow plate 16 are welded in one step through ultrasonic seam welding.

Referring to fig. 3, in order to facilitate the subsequent installation of the battery cell 3 and improve the safety, at least one of the bottom plates 5 is provided with a limiting ring 12 on the inward side, and the limiting ring 12 is used for limiting the position of the battery cell 3 installed in the battery case. The inward side of the bottom plate 5 is provided with an insulating sheet 13, and the insulating sheet 13 is positioned in the limiting ring 12.

Referring to fig. 14, the battery cell 3 includes a plurality of positive electrode units 24 and a plurality of negative electrode units 25, and the positive electrode units 24 and the negative electrode units 25 are arranged in a staggered manner. The length difference between the length of the negative electrode unit 25 and the length of the positive electrode unit 24 is 0.5-1.5mm, and the length difference between the width of the negative electrode unit 25 and the width of the positive electrode unit 24 is 0.5-1.5mm, so that the possibility of short circuit is reduced.

Referring to fig. 15 and 16, the positive electrode unit 24 includes a positive electrode sheet 26, a positive electrode polymer interface management layer film 27 located on both sides of the positive electrode sheet 26, and a positive electrode active material 69 located between the positive electrode sheet 26 and the positive electrode polymer interface management layer film 27, and the positive electrode polymer interface management layer film 27 includes a first nonpolar separator 28 and a first positive electrode conductive polymer interface management layer film 29 located on both sides of the first nonpolar separator 28.

Referring to fig. 17 and 18, the negative electrode unit 25 includes a negative electrode sheet 30, a negative electrode polymer interface management layer film 31 positioned on both sides of the negative electrode sheet 30, and a negative electrode active material 70 positioned between the negative electrode sheet 30 and the negative electrode polymer interface management layer film 31. The negative electrode polymer interface management layer 31 includes a second nonpolar separator 32 and second negative electrode conductive polymer interface management layer films 33 located on both sides of the second nonpolar separator 32.

The thicknesses of the first nonpolar separator 28, the second nonpolar separator 32, the first positive electrode conductive polymer interface management layer film 29, and the second negative electrode conductive polymer interface management layer film 33 are set according to actual materials and requirements. In this embodiment, the first and second nonpolar separators 28 and 32 are each 5 μm thick, and the first and second positive electrode conductive polymer interface management layer films 29 and 33 are each 1-1.5 μm thick. Therefore, the thickness of the positive electrode polymer interface control layer film 27 and the negative electrode polymer interface control layer film 31 are both 7 to 8 μm. Referring to fig. 1, the total thickness of the positive electrode polymer interface management layer film 27 and the negative electrode polymer interface management layer film 31 between the positive electrode sheet 26 and the negative electrode sheet 30 is 14 to 16 μm.

The base films of the first and second non-polar separators 28 and 32 may be made of PE, PP, PET, PEO, PAN, PA, PI, aramid, etc., and the first and second non-polar separators 28 and 32 have a pore size of 0.03 to 1 μm and a porosity of 40 to 60%. The first nonpolar separator 285 and the second nonpolar separator 32 are nonpolar polymer skeleton phases, and have a porosity structure having a function of passing electrons of ionic groups.

The first positive conductive polymer interface management layer film 29 is composed of PVDF-HFP, a solid electrolyte, a binder, a conductive agent, and a nano oxide. The adhesive is PVDF, which is a polar polymer skeleton phase. PVDF-HFP is a polar amorphous phase conductive polymer group, and exists in a continuous state on the surface of the first nonpolar separator 285 and in the micropores of the binder. Solid electrolytes include, but are not limited to, boehmite, LLZO, PIM-1 intercalated with lithium fluoride, li0.33La0.56TiO3, and the like. The solid electrolyte exists in a continuous state on the surface of the first non-polar separator 285 and in the pores.

The conductive agent includes but is not limited to any one of VFCF, SPUER-Li, S-O, KS-6, KS-15, SFG-6, SFG-15, 350G, acetylene Black (AB), ketjen Black (KB), vapor Grown Carbon Fiber (VGCF), and Carbon Nanotube (CNT). The VFCF may be chemically modified to have better compatibility with the active material and current collector by modifying or introducing other ions, such as fluoride ions, to the surface of the VGCF. SPUER-Li can be replaced by, for example, ketjen black ECP, acetylene black, carbon nanotubes, ks-6, etc.; or selecting more than two kinds of conductive agent (SPUER-Li, S-O, KS-6, KS-15, SFG-6, SFG-15, 350G, acetylene Black (AB), ketjen Black (KB), vapor Grown Carbon Fiber (VGCF), and Carbon Nanotube (CNT) without replacement.

The second negative conductive polymer interface management layer film 33 is composed of a binder, a conductive agent, and a nano oxide. The conductive agent includes but is not limited to any one of VFCF, SPUER-Li, conductive carbon black SP, ketjen black ECP, acetylene black, carbon nano-tube and SFG-6.

The processing technology of the battery cell 3 comprises the following steps:

1. referring to FIG. 19, an aluminum foil of 0.012mm in thickness was prepared as a base material of positive electrode sheet 26,

2. referring to fig. 19, a positive electrode tab 34 is cut out from the positive electrode sheet 26 to form a positive electrode roll 35;

3. referring to fig. 15 and 19, a first non-polar separator 28 is prepared, the first non-polar separator 28 is made of at least one of PE, PP, PET, PEO, PAN, PA, PI, and aramid, and in this embodiment, the first non-polar separator 28 is made of PE, and a cathode active material, a binder, and a proper amount of a conductive agent are added to prepare a cathode slurry;

4. referring to fig. 15 and 19, a cathode slurry is coated on both sides of a first non-polar separator 28 to form a first positive conductive polymer interface management layer film 29, leaving a space for a positive tab 34; specifically, the positive active material is lithium iron phosphate LFP, the conductive agent is conductive carbon black, the adhesive is PVDF, and the LFP, the conductive agent and the adhesive are mixed by a mixing ratio of 94:4:2, preparing slurry in NMP (N-methyl pyrrolidone), uniformly coating the slurry on the first nonpolar membrane 28 by a roller coating method, vacuum-drying at 120 ℃ for 16h, and rolling to form the positive polymer interface management layer 27.

5. Referring to fig. 20, two rolls of the positive polymer interface management layer film 27 and one roll of the positive electrode roll 35 are prepared, and a three-in-one positive electrode roll 35 containing the polymer interface management layer, namely a positive electrode unit roll 36, is formed by pressing the positive polymer interface management layer film 27, the positive electrode roll 35 and the positive polymer interface management layer film 27 in sequence on a thermal compound machine according to process requirements;

specifically, the positive polymer interface management layer film 27, the positive electrode roll 35 and the positive polymer interface management layer film 27 sequentially pass through a first heating zone 37, a second heating zone 38 and a third heating zone 39 during hot pressing, wherein the temperature of the first heating zone 37 is 60-90 ℃, the temperature of the second heating zone 38 is 90-110 ℃, and the temperature of the third heating zone 39 is 110-120 ℃; the third heating area 39 is provided with two positive pressure rollers 40, a gap for the positive unit roll 36 to pass through is formed between the two positive pressure rollers 40, and the temperature of the positive pressure roller 40 is 110-120 ℃;

6. referring to fig. 19, the positive electrode unit roll 36 is cut into the positive electrode units 24;

7. referring to fig. 21, a copper foil of 0.006mm thickness was prepared as a negative electrode sheet 30 substrate;

8. referring to fig. 21, a negative electrode tab 41 is cut out from the negative electrode sheet 30 to form a negative electrode roll 42;

9. referring to fig. 17 and 21, preparing a second non-polar separator 32, wherein the second non-polar separator 32 is made of at least one of PE, PP, PET, PEO, PAN, PA, PI, and aramid, and in this embodiment, the second non-polar separator 32 is made of PE, and a negative active material, a binder, and a proper amount of a conductive agent are added to prepare an anode slurry;

10. referring to fig. 17 and 21, the anode slurry is coated on both sides of the second nonpolar separator 32 to form a second negative conductive polymer interface management layer film 33, leaving a space for a negative electrode tab 41; specifically, the cathode active material is mesocarbon microbeads (MCMB), the conductive agent is conductive carbon black, the binder is PVDF, and the MCMB, the conductive agent and the binder are mixed in a ratio of 95:3:2, preparing slurry in NMP (N-methylpyrrolidone), uniformly coating the slurry on the second nonpolar membrane 32 by a roller coating method, vacuum-drying at 120 ℃ for 16h, and rolling to form the negative electrode polymer interface management layer membrane 31.

11. Referring to fig. 22, two rolls of the negative polymer interface management layer film 31 and one roll of the negative electrode roll 42 are prepared, and a three-in-one negative electrode roll 42 containing the polymer interface management layer, that is, a negative electrode unit roll 43, is formed by pressing the negative polymer interface management layer film 31, the negative electrode roll 42, and the negative polymer interface management layer film 31 in this order on a thermal compound machine according to process requirements;

specifically, when the negative electrode polymer interface management layer film 31, the negative electrode roll 42 and the negative electrode polymer interface management layer film 31 are subjected to hot pressing, the negative electrode polymer interface management layer film, the negative electrode roll and the negative electrode polymer interface management layer film sequentially pass through a fourth heating area 44, a fifth heating area 45 and a sixth heating area 46, wherein the temperature of the fourth heating area 44 is 90-110 ℃, the temperature of the fifth heating area 45 is 110-125 ℃, and the temperature of the sixth heating area 46 is 125-130 ℃; the sixth heating area 46 is provided with two negative pressure rollers 47, a gap for the negative unit coil 43 to pass through is formed between the two negative pressure rollers 47, and the temperature of the negative pressure rollers 47 is 125-130 ℃;

12. referring to fig. 21, the negative electrode unit roll 43 is cut into the negative electrode units 25;

13. with reference to fig. 14 and 23, sheets are grabbed by a mechanical arm of a lamination machine, and the negative electrode units 25 and the positive electrode units 24 are stacked in a staggered and reverse manner to form the battery core 3 according to the process requirements;

14. referring to fig. 24, the stacked and integrated battery cells 3 are encapsulated and thermally pressed; specifically, when the battery cell 3 is subjected to hot flat pressing, the battery cell sequentially passes through a seventh heating zone 48, an eighth heating zone 49 and a ninth heating zone 50, wherein the temperature of the seventh heating zone 48 is 80-100 ℃, the temperature of the eighth heating zone 49 is 100-120 ℃, and the temperature of the ninth heating zone 50 is 120-140;

15. after hot pressing, the battery is subjected to primary activation, dried and then filled into an aluminum-plastic composite bag or a battery shell 1, and then secondary activation and sealing are carried out.

The manufacturing process of the large-size ultrathin square high-polymer power battery comprises the following steps:

1. manufacturing an electric core 3;

2. placing the battery cell 3 in the limiting ring 12 of one housing unit 4, and then covering the other housing unit 4 on the battery cell 3, so that the two housing units 4 are abutted against each other; then, the two shell units 4 are stably and fixedly connected together in a multi-pass welding mode, a clamping edge 8 structure mode and the like;

3. the battery cover plate 2 is arranged on the battery shell 1, and then the battery cover plate 2 and the battery shell 1 are stably fixed together through multiple welding processes to form a closed battery whole body with better sealing property;

4. the glue injection port 21 in the battery cover plate 2 is used for injecting glue into the accommodating cavity, so that the battery is sealed in one step, the whole installation process is convenient, the battery core 3 can be stably and conveniently placed into the battery shell, and the installation efficiency is improved.

Example 2

The difference between the embodiment 2 and the embodiment 1 is that, referring to fig. 25, the welding ring 17 is extended outward by the abutting plates 51, and the abutting plates 51 are used for shielding the joints of the extension plate group and are welded and fixed with the extension plates 7 and the clamping edges 8, so that the whole battery has better air tightness.

The above are only two specific embodiments of the present application, and any other modifications based on the concept of the present application are considered as the protection scope of the present application.

Claims (10)

1. A large-size ultrathin square high-polymer power battery is characterized in that: comprises a battery shell (1), battery cover plates (2) arranged at two sides of the battery shell (1) and a battery core (3) arranged in the battery shell (1);

the battery shell (1) comprises two shell units (4) which are symmetrically arranged, each shell unit (4) comprises a bottom plate (5), vertical plates (6) which are fixedly connected to two sides of the bottom plate (5) and extension plates (7) which are fixedly connected to one ends, far away from the bottom plate (5), of the vertical plates (6), the two shell units (4) are combined to form a containing cavity for containing the battery core (3), and the extension plates (7) between the two shell units (4) are abutted in pairs and welded and fixed;

battery apron (2) are equipped with two and are located respectively and hold chamber both ends opening, battery apron (2) are including inlaying apron body (14) of locating holding the intracavity, apron body (14) circumference is located welding ring (17) of apron body (14) outer wall, welding ring (17) are used for the butt in holding the intracavity wall, welding ring (17) are through welded fastening connection in housing element (4).

2. The large-sized ultra-thin square-shaped polymer power cell as claimed in claim 1, wherein: and the corresponding extension plates (7) are reinforced and welded through two welding-penetration welding, and the welding depth of the two welding-penetration welding is 1/3-2/3 of the thickness of the extension plates (7).

3. The large-sized ultra-thin square-shaped polymer power cell as claimed in claim 1, wherein: the welding ring (17) and the shell unit (4) are subjected to reinforcement welding through two welding-penetration welding, and the welding depth of the two welding-penetration welding is 1/3-2/3 of the thickness of the shell unit (4).

4. The large-sized ultra-thin square-shaped polymer power cell as claimed in claim 2, wherein: the width of the extension plate (7) is not less than 1.5mm.

5. The large-sized ultra-thin square-shaped polymer power cell as claimed in claim 3, wherein: the welding device is characterized in that abutting plates (51) used for abutting against the end wall of the battery shell (1) are arranged on two sides of the welding ring (17), the extending plate (7) is covered by the abutting plates (51), and the abutting plates (51) are welded and fixed outside the extending plate (7).

6. The large-sized ultra-thin square-shaped polymer power cell as claimed in claim 1, wherein: at least one of the bottom plates (5) is provided with a limiting ring (12) on one side facing inwards, and the battery core (3) is installed in the limiting ring (12) and limited by the limiting ring (12).

7. The large-sized ultra-thin square-shaped polymer power cell as claimed in claim 1, wherein: and an insulating sheet (13) used for isolating the battery core (3) and the bottom plate (5) is arranged on one side of the bottom plate (5) facing the battery core (3).

8. The large-sized ultra-thin square-shaped polymer power cell as claimed in claim 1, wherein: electric core (3) include a plurality of positive pole units (24) and a plurality of negative pole unit (25), be the setting of staggering between positive pole unit (24) and negative pole unit (25), positive pole unit (24) include positive plate (26) and be located the anodal polymer interface management rete (27) of positive plate (26) both sides, negative pole unit (25) include negative pole piece (30) and be located negative pole polymer interface management rete (31) of negative pole piece (30) both sides.

9. The large-sized ultra-thin square-shaped polymer power cell as claimed in claim 8, wherein: the length of the negative plate (30) is shorter than that of the positive plate (26), and the width of the negative plate (30) is shorter than that of the positive plate (26).

10. The large-sized ultra-thin square-shaped polymer power cell as claimed in claim 9, wherein: anodal polymer interface management tunic (27) include first nonpolar unfamiliar (28) and be located the electrically conductive polymer interface management tunic (29) of first anodal of first nonpolar unfamiliar (28) both sides, negative pole polymer interface management tunic (31) include second nonpolar unfamiliar (32) and be located the electrically conductive polymer interface management tunic (33) of second negative pole of second nonpolar unfamiliar (32) both sides.

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