CN212257468U - PP insulation cushion block with structure for preventing rubber plug from falling off - Google Patents

Abstract

The utility model relates to a PP insulation cushion block with a structure for preventing a rubber plug from falling off, which comprises a flat-plate-shaped bottom plate, wherein a plurality of riveting holes are arranged in one side area of the bottom plate, and a structure for preventing the rubber plug from falling off is arranged in the other side area of the bottom plate; the structure for preventing the rubber plug from falling comprises a through hole corresponding to the position of the liquid injection hole of the top cover, the through hole is connected with a disc with a central hole into a whole through bone positions, the bone positions are of a plurality of step-shaped structures and are uniformly distributed in a circumferential manner by taking the through hole as the center, the inner diameter of the through hole is larger than the diameter of the central hole of the disc with the central hole, and the circle centers of the through hole and the central hole are on the same axis. The utility model discloses the PP insulation cushion block of plug shedding structure is prevented in area is guaranteeing under the prerequisite that insulating and electrolyte normally flowed through, has increased and has prevented the plug shedding structure, restricts the position of plug, makes inside it can't get into the lithium cell to avoid impaling the diaphragm because of the plug and cause the inside short circuit of lithium cell, the risk of explosion on fire.

Description

PP insulation cushion block with structure for preventing rubber plug from falling off

Technical Field

The utility model belongs to the technical field of square lithium cell makes, concretely relates to PP insulation cushion block of structure prevents that plug drops in area.

Background

With the trend of vigorous green and low-carbon life in various countries in the world, lithium ion batteries with the characteristics of high energy density, long service life and the like are increasingly used as secondary batteries for vehicles, and particularly square lithium batteries are favored. In the square lithium cell manufacture process, set up the insulating cushion of PP generally between electric core and apron and prevent to roll up the risk that the core caused the short circuit because of vibration and apron contact.

Most of PP insulating cushion blocks used by the existing square lithium battery are flat, and a through hole is formed in the position, corresponding to a liquid injection hole of a top cover plate, of the insulating cushion block, so that electrolyte can smoothly enter the lithium battery; simultaneously for preventing welding slag and other harmful metallic impurity that the laser welding gasket produced from entering the lithium cell through the top cap notes liquid hole inside, all can plug with a plug notes liquid hole before the laser welding process usually to guarantee sealed effect.

The rubber plug material that prior art used is mostly PP + EPDM and mixes according to certain proportion and makes, and the finished product is rich in elasticity, but different ratio proportion and the processing technology of different producers, and the rubber plug finished product elasticity difference of producing is great, and size difference is also great. Therefore, when the rubber plug is used for sealing the liquid injection hole in the lithium battery production, the tightness, the sealing performance and the assembly performance of the assembly of the rubber plug and the liquid injection hole are difficult to be consistent. And the lithium cell can take place the vibration at the in-process of transportation and use, if the plug is not inseparable with annotating the liquid hole assembly, the phenomenon that the plug drops and get into the lithium cell inside can appear. After the plug drops, the sealed gasket that only remains laser welding of lithium cell, if there is sand hole or other badly in the laser welding position of gasket, then the leakproofness of lithium cell is destroyed promptly, takes place electrolyte and spills the phenomenon. In addition, the rubber plug falling into the lithium battery is in a free state, and the specific position of the rubber plug cannot be accurately known; under special conditions, the rubber plug can enter between the pole piece and the diaphragm and pierce the diaphragm to cause short circuit inside the lithium battery; even in extreme cases, can cause the lithium cell to catch fire and explode.

Chinese patent CN 203491317U discloses a lithium battery locking insulating pad block, which comprises a pad block body, wherein a boss is arranged in the middle of the pad block, insulating sheets extending outwards from the bottom are arranged on two sides of the boss, the boss is provided with vertical through holes, strip-shaped through holes are arranged on the insulating sheets, and the boss and the insulating sheets are integrated into a whole by injection molding; and the stop cushion block is arranged at the gap between the top end of the battery core of the lithium battery and the top cover of the battery, and the tab lead-out wires penetrate through the strip-shaped through holes on the insulating sheet to be separated at equal intervals. This patent has avoided the contact of utmost point ear lead-out wire with the positive and negative pole piece of electric core through the bar through-hole on the insulating piece, but this insulating cushion does not relate to how to avoid the plug to drop to the lithium cell internal portion and the safety problem that causes from annotating the liquid hole.

Disclosure of Invention

The utility model aims at providing a PP insulation cushion block of plug shedding structure is prevented in area has increased and has prevented the plug shedding structure under the prerequisite of guaranteeing insulating and electrolyte normal flow, restricts the position of plug, makes inside it can't get into the lithium cell to avoid impaling the diaphragm because of the plug and cause the inside short circuit of lithium cell, the risk of explosion on fire.

The utility model provides a technical scheme that above-mentioned problem adopted does: the PP insulation cushion block comprises a flat-plate-shaped bottom plate, a plurality of riveting holes are formed in one side area of the bottom plate, and a rubber plug falling-off prevention structure is arranged in the other side area of the bottom plate; the structure for preventing the rubber plug from falling comprises a through hole corresponding to the position of a liquid injection hole of the top cover, the through hole is connected with a disc with a central hole into a whole through bone positions, the bone positions are of a plurality of step-shaped structures and are uniformly distributed in a circumferential manner by taking the through hole as the center, the circle center of the through hole and the circle center of the disc with the central hole are on the same axis, the inner diameter of the through hole is larger than the diameter of the central hole of the disc with the central hole, and the inner diameter of the central hole of the disc with the central hole is smaller than.

Preferably, the number of the riveting holes is 4, and the positions of the riveting holes correspond to the positions of the riveting holes in the top cover.

Preferably, the bone positions are of a step-shaped structure with 3 or more bone positions and are uniformly distributed in a circumferential shape by taking the through hole as a center.

Preferably, the bone positions are 4 same step-shaped structures which are distributed at an angle of 90 degrees with each other.

Preferably, the height of the bone position is equal to the vertical distance between the through hole and the disk with the central hole.

Compared with the prior art, the utility model has the advantages of:

(1) the utility model adopts a plurality of step-shaped structures and is circumferentially and evenly distributed by taking the through hole as the center, and the bone position of the structure is connected with the through hole and the disc with a center hole, thereby having the functions of connection and limitation; meanwhile, the bone position of the device is of a hollow structure, so that the normal flow of electrolyte cannot be hindered.

(2) Annotate the liquid completion back, need plug the notes liquid hole with the plug, the plug is through the notes liquid hole of top cap, prevent the through-hole in the plug structure that drops, bone position, take the disc of centre bore, the disc of taking the centre bore is touched to the bottom until the plug, the diameter because of the centre bore is less than the diameter of plug, the event can't continue to insert, in follow-up transportation of lithium cell and use, the position of plug is restricted, can't get into inside the lithium cell, thereby avoid causing the inside short circuit of lithium cell because of the plug impales the diaphragm, the risk of explosion on fire.

(3) The utility model provides a PP insulation cushion block of structure that drops is prevented in area has increased and has prevented the plug structure that drops under the prerequisite of guaranteeing insulating and electrolyte normal flow, has further strengthened the design to product security to satisfy the requirement of lithium cell security.

Drawings

Fig. 1 is the embodiment of the utility model provides an embodiment of the structure sketch map of the PP insulation cushion block that the plug drops is prevented in the area.

Wherein: 1 is PP insulating cushion, 2 is the bottom plate, 3 is the riveting hole, and 4 is for preventing the plug structure that drops.

Fig. 2 is an enlarged schematic view of the structure for preventing the rubber plug from falling off in the embodiment of the present invention.

Wherein: 5 is a through hole, 6 is a bone position, and 7 is a disk with a central hole.

Fig. 3 is the utility model discloses an assembly schematic diagram of top cap, plug and PP insulation cushion.

Wherein: 1 is PP insulating cushion block, 8 is the plug, 9 is the top cap.

Fig. 4 is a partial cross-sectional view of the plug insertion position in the embodiment of the present invention.

Fig. 5 is a partial enlarged view of a portion a in fig. 4.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1, fig. 1 is a schematic structural diagram of a PP insulating block according to an embodiment of the present invention.

The utility model provides a PP insulation cushion that structure was dropped off in area prevents plug, PP insulation cushion 1 includes flat bottom plate 2, 4 riveting holes 3 have been seted up in the one side region of bottom plate 2, the riveting hole position in 3 and the top cap 9 of riveting hole position correspond for pass the rivet when assembling top cap 9, the opposite side region of bottom plate 2 is equipped with prevents plug structure 4 that drops.

As shown in fig. 2, fig. 2 is an enlarged schematic view of the structure for preventing the rubber plug from falling off in the embodiment of the present invention.

The structure 4 for preventing the rubber plug from falling off comprises a through hole 5 corresponding to the position of a liquid injection hole of the top cover, the through hole 5 is connected with a disc 7 with a central hole into a whole through bone positions 6, the bone positions 6 are 4 stepped structures which are mutually distributed at 90 degrees, the inner diameter of the through hole 5 is larger than the diameter of the central hole of the disc 7 with the central hole, and the circle center of the through hole 5 and the circle center of the disc 7 with the central hole are on the same axis.

The height of the bone position 6 is equal to the vertical distance between the through hole 5 and the disc 7 with the central hole, and the inner diameter of the central hole of the disc 7 with the central hole is smaller than the diameter of the rubber plug 8.

As shown in fig. 3, fig. 3 is an assembly diagram of the top cap, the rubber plug and the PP insulating pad of the embodiment of the present invention.

The PP insulating cushion block 1 with the plug falling prevention structure 4 is assembled with the top cover 9 through a riveting process, and the plug 8 is inserted into the liquid injection hole of the top cover 9 and sealed through the PP insulating cushion block 1 with the plug falling prevention structure 4.

As shown in fig. 4, fig. 4 is a partial cross-sectional view of the plug insertion position in the embodiment of the present invention.

As shown in fig. 5, fig. 5 is a partially enlarged view of a in fig. 4.

The height of the rubber plug 8 is the sum of the thickness of the liquid injection hole plate of the top cover 9 and the internal height of the bone position 6. After the liquid injection is completed, the liquid injection hole is required to be plugged by a rubber plug 8, the rubber plug 8 prevents the through hole 5, the bone position 6 and the disc 7 with the central hole in the rubber plug falling structure 4 through the liquid injection hole of the top cover 9 until the bottom of the rubber plug 8 can contact the disc 7 with the central hole, and the rubber plug cannot be inserted continuously because the diameter of the central hole is smaller than that of the rubber plug 8. In the follow-up transportation of lithium cell and use, the position of plug 8 is restricted, can't get into inside the lithium cell to avoid impaling the diaphragm because of the plug and causing the inside short circuit of lithium cell, the risk of explosion on fire.

In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims (5)

1. The utility model provides a PP insulation cushion of structure that drops is prevented in area, PP insulation cushion (1) includes flat-plate bottom plate (2), its characterized in that: a plurality of riveting holes (3) are formed in one side area of the bottom plate (2), and a rubber plug falling-off preventing structure (4) is arranged in the other side area of the bottom plate (2); prevent that plug drops structure (4) includes and annotates corresponding through-hole (5) in liquid hole position with the top cap, through-hole (5) link into an integrated entity through position of bone (6) and disc (7) of taking the centre bore, position of bone (6) are a plurality of echelonment structures and use through-hole (5) to be circumference form equipartition as the center, the centre of a circle of through-hole (5) with the centre of a circle of disc (7) of taking the centre bore is on same axis, the internal diameter of through-hole (5) is greater than the diameter of the centre bore of disc (7) of taking the centre bore, the centre bore diameter of disc (7) of taking the centre bore is less than plug (8) diameter.

2. The PP insulation cushion block with the rubber plug falling-off prevention structure according to claim 1, is characterized in that: the number of the riveting holes (3) is 4, and the positions of the riveting holes (3) correspond to the positions of the riveting holes in the top cover.

3. The PP insulation cushion block with the rubber plug falling-off prevention structure according to claim 1, is characterized in that: the bone positions (6) are of a step-shaped structure with more than 3 and are uniformly distributed in a circumferential shape by taking the through hole (5) as the center.

4. The PP insulation cushion block with the rubber plug falling-off prevention structure according to claim 3, is characterized in that: the bone positions (6) are 4 stepped structures which are mutually distributed at 90 degrees.

5. The PP insulation cushion block with the rubber plug falling-off prevention structure according to claim 1, is characterized in that: the height of the bone position (6) is equal to the vertical distance between the through hole (5) and the disc (7) with the central hole.

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