CN2786803Y - Large-capacity metal shell lithium ion secondary battery - Google Patents

Abstract

The utility model relates to a large-capacity metal shell lithium ion secondary battery which is characterized in that the positive terminal and negative terminal are respectively composed of an upper backing board, an upper insulator and a lower insulating board. The upper backing board and the upper insulator are long circular shape slice body. The lithium ion secondary battery passes through the concentric hole of the upper end of pole ear of the positive or negative electrode, the lower insulating board, the covering plate substrate body, the upper insulator and the upper backing board by using two or more two rivets to rivet connect to one body. The lower end of the pole ear of positive or negative electrode connects to the pole ear of positive or negative electrode which is arranged on battery core, the battery core is formed by connecting two or more than two winding core in parallel. The battery is provided with better sealing, better electrochemistry performance, simple production technology, high security of the battery set composed of the battery monomer, decreasing the height of invalid space of the battery, improving the volumetric and energy of the battery, etc. advantages and effects.

Description

High capacity lithium ion secondary battery with metal case

Technical field

The utility model relates to a kind of high capacity lithium ion secondary battery with metal case, belongs to energy field.

Technical background

Lithium ion battery has the advantage of high power capacity and high-energy-density, developed rapidly in recent years and used, nickel-cadmium cell and Ni-MH battery have been replaced gradually in a lot of applications, extensively apply at present at electric bicycle, electric motorcycle and electric automobile, existing high capacity lithium ion secondary battery with metal case, the positive and negative electrode terminal adopts bolt connecting mode usually, and a gate terminal of the battery that also has adopts the riveted joint mode to connect, and an other gate terminal is a battery container.But because the voltage height of this kind battery, adopt nonaqueous electrolytic solution, and use in groups usually, so under the situation of abuse, safety problems such as it is on fire to blast easily, one of its reason just is, negative electrode terminal adopts bolted bolt method usually, owing to be used in the vehicles or the mobile device, vibration force is big, and bolt is very easily lax, causes electrolyte leakage, battery pack short circuit and having an accident, the packaging technology complexity of battery is difficult to reach high-seal when producing in batches simultaneously, and then there is very big short circuit hidden danger in use in the existing battery pack that with the metal shell is the battery cell of the negative or positive electrode of battery is formed.

The utility model content

The purpose of this utility model provides a kind of high capacity lithium ion secondary battery with metal case of rivet fixed electrode terminal just with deficiency for the shortcoming that overcomes above-mentioned prior art, thereby improved the sealing property of battery, the security performance and the chemical property of lithium ion secondary batteries have been improved, especially high rate during charging-discharging has also been simplified production technology.

The purpose of this utility model realizes by following technical proposal:

High capacity lithium ion secondary battery with metal case, it comprises housing (3), blank cover (1), battery (2), explosionproof hole (6), liquid injection hole (7), positive terminal (4) and negative terminal (5), it is characterized in that positive terminal and negative terminal are at the blank cover two ends, explosionproof hole is just, between the negative terminal, liquid injection hole is on an end corner of blank cover, positive terminal and negative terminal are respectively by the upper padding plate that places two ends (8), upper insulator (9) and place lower insulation plate (10) below the blank cover matrix, just, negative lug (11,14) form, upper padding plate and upper insulator are the Long Circle lamellar body, the Long Circle groove that can insert Long Circle lamellar body upper padding plate is arranged above the upper insulator, two or more circular holes are arranged in the groove, there is tube shape bulge the circular hole bottom surface, concentric circle holes tight fit on tube shape bulge external diameter and the blank cover matrix, internal diameter and rivet post tight fit, the boss height is identical with the blank cover matrix thickness, lower insulation plate is the rectangle lamellar body, pass plus or minus utmost point lug upper end with two or more rivets (12), lower insulation plate, the blank cover matrix, the concentric holes riveted joint one of upper insulator and upper padding plate, just, on negative lug lower end and the battery just, negative lug is corresponding to be connected.

Described battery is composed in parallel by two or more volume cores that anode plate, barrier film and negative plates coiling form; Described rivet is a solid rivet, and the used rivet bar of positive terminal is an aluminum or aluminum alloy, and the used rivet bar of negative terminal is aluminium or copper and alloy thereof.

Jumbo lithium ion secondary battery with metal case described in the utility model, its capacity is generally more than 5 ampere-hours, metal shell is a stainless steel, aluminium alloy or nickel-clad iron material drawn or be stamped to form, the blank cover basis material is identical with case material, form by the metal pattern punching out, go out "+" at two edges of blank cover matrix, "-" indentation be battery just, the negative pole sign, liquid injection hole is used to pour into electrolyte, available little steel ball or ductile metal piece indentation sealing, explosionproof hole is a battery safety valve, liquid injection hole is on an end corner of blank cover, usually seal with the welding of tinsel brazing mode or with the high strength bonding agent, battery is by just, negative plates and barrier film compose in parallel through two or more volume cores that coiling forms, positive electrode is a cobalt acid lithium, lithium nickelate, LiMn2O4 or LiFePO 4, but negative material is material with carbon element or other lithium intercalation compound, upper insulator, it is injection molded that the lower insulation plate employing has the high-insulativity macromolecular material, and normally used macromolecular material is polypropylene or fluorine resin.

Owing to take technique scheme to make the utility model technology compared with the prior art have following advantage and effect:

(a) battery container and positive and negative electrode terminal insulation, the fail safe that has improved battery pack,

(b) improve sealing property, improve the chemical property of battery, also simplified production technology,

(c) adopt two or more rivets can reduce the internal resistance of battery effectively, improve the big electric current fan-out capability of battery, reduced the idle space height of battery, improve the volume of battery specific energy.

(d) battery adopts the two or more volume cores that are wound into to compose in parallel, and has also reduced the internal resistance of cell effectively, and is easy to realize that production technology is simple.

Description of drawings

Fig. 1 is a lithium rechargeable battery structural representation of the present utility model,

Fig. 2 is a view before and after the assembling of battery positive and negative electrode terminal.

Embodiment

High capacity lithium ion secondary battery with metal case, by shown in Figure 1, it comprises housing (3), blank cover (1), battery (2), explosionproof hole (6), liquid injection hole (7), positive terminal (4) and negative terminal (5), positive terminal and negative terminal are at the blank cover two ends, explosionproof hole is just, between the negative terminal, liquid injection hole is on an end corner of blank cover, positive terminal and negative terminal are respectively by the upper padding plate that places two ends (8), upper insulator (9) and place lower insulation plate (10) below the blank cover matrix (13), just, negative lug (11,14) form, upper padding plate and upper insulator are the Long Circle lamellar body, the Long Circle groove that can insert Long Circle lamellar body upper padding plate is arranged above the upper insulator, two or more circular holes are arranged in the groove, there is the tube shape bulge (not shown) circular hole bottom surface, concentric circles tight fit on tube shape bulge external diameter and the blank cover matrix, internal diameter and rivet post tight fit, the boss height is identical with the blank cover matrix thickness, can make rivet and blank cover insulation by tube shape bulge, improved the fail safe of battery pack, lower insulation plate is the rectangle lamellar body, pass plus or minus utmost point lug upper end with two or more rivets (12), lower insulation plate, the blank cover matrix, the concentric holes riveted joint one of upper insulator and upper padding plate, just, on negative lug lower end and the battery just, negative lug is corresponding to be connected, by shown in Figure 2, Fig. 2 left hand view is the preceding state of assembling, right part of flg is assembling back state, this rivet is a solid rivet, the used rivet bar of positive terminal is an aluminum or aluminum alloy, and the used rivet bar of negative terminal is aluminium or copper and alloy thereof.The method of this connection electrode not only can make the insulation of positive and negative electrode terminal and housing but also the idle space height of reduction battery improves the volume of battery specific energy, and the phenomenon of having avoided producing battery leakage and short circuit because of bolt looseness takes place.

Upper insulator is made by mold injection, go out two holes or plural hole respectively at blank cover matrix two ends, but the tube shape bulge external diameter tight fit on pore size and the upper insulator, can make anode and cathode terminals and casing insulation after the assembling like this, middle towards an explosionproof hole, one end edge dashes a liquid injection hole, upper padding plate, lower insulation plate and positive and negative electrode lug upper end are also gone out two holes or the plural hole identical with blank cover matrix hole spacing, pore size and rivet column diameter tight fit respectively.During assembling, pass the concentric holes riveted joint one of plus or minus utmost point lug upper end, lower insulation plate, blank cover matrix, upper insulator and upper padding plate with two or more rivets, battery is put into housing, the lower end of the plus or minus utmost point lug on the blank cover is connected with electric resistance welding or ultrasonic bond with the plus or minus utmost point lug of battery respectively, and the mode with Laser Welding or flanging sealing is connected one with blank cover with housing then.

Technology of the present utility model also is applicable to NI-G or Ni-MH power cell, and reaches same effect.

Claims (3)

1, a kind of high capacity lithium ion secondary battery with metal case, it comprises housing (3), blank cover (1), battery (2), explosionproof hole (6), liquid injection hole (7), positive terminal (4) and negative terminal (5), it is characterized in that positive terminal and negative terminal are at the blank cover two ends, explosionproof hole is just, between the negative terminal, liquid injection hole is on an end corner of blank cover, positive terminal and negative terminal are respectively by the upper padding plate that places two ends (8), upper insulator (9) and place lower insulation plate (10) below the blank cover matrix, just, negative lug (11,14) form, upper padding plate and upper insulator are the Long Circle lamellar body, the Long Circle groove that can insert Long Circle lamellar body upper padding plate is arranged above the upper insulator, two or more circular holes are arranged in the groove, there is tube shape bulge the circular hole bottom surface, concentric circle holes tight fit on tube shape bulge external diameter and the blank cover matrix, internal diameter and rivet post tight fit, the boss height is identical with the blank cover matrix thickness, lower insulation plate is the rectangle lamellar body, pass plus or minus utmost point lug upper end with two or more rivets (12), lower insulation plate, the blank cover matrix, the concentric holes riveted joint one of upper insulator and upper padding plate, just, on negative lug lower end and the battery just, negative lug is corresponding to be connected.

2, lithium rechargeable battery according to claim 1 is characterized in that described battery is composed in parallel by two or more volume cores that anode plate, barrier film and negative plates coiling form.

3, lithium rechargeable battery according to claim 1 is characterized in that described rivet is a solid rivet, and the used rivet bar of positive terminal is an aluminum or aluminum alloy, and the used rivet bar of negative terminal is aluminium or copper and alloy thereof.

Images