CN218731594U

CN218731594U - Lithium iron phosphate battery cover plate

Info

Publication number: CN218731594U
Application number: CN202222819215.9U
Authority: CN
Inventors: 何天卫; 马存英
Original assignee: Super Ness Shenzhen New Energy Group Co ltd
Current assignee: Super Ness Shenzhen New Energy Group Co ltd
Priority date: 2022-10-25
Filing date: 2022-10-25
Publication date: 2023-03-24
Anticipated expiration: 2032-10-25

Abstract

The utility model relates to the technical field of batteries, specifically disclose a lithium iron phosphate battery cover plate, which comprises a substrate, the top surface insulation of base plate is connected with anodal piece and negative pole piece, be equipped with on the base plate and annotate liquid hole and explosion-proof hole, the shutoff has explosion-proof diaphragm in the explosion-proof hole, the bottom of base plate is equipped with the insulation board, the bottom butt of insulation board has anodal piece and negative pole piece, and the anodal piece passes through anodal rivet and is connected with anodal piece, and the negative pole piece passes through the negative pole rivet and is connected with the negative pole piece, the insulation board corresponds the position of annotating the liquid hole and has seted up the liquid hole, the bottom sealing connection of base plate has one-way gas leakage cover, one-way gas leakage cover will establish including explosion-proof hole cover, the penetrating shaping on the one-way gas leakage cover has a plurality of bleeder vents, the inner wall of one-way gas leakage cover is hugged closely there is the flexible glue film, the flexible glue film will be a plurality of, the bleeder vent covers and seals, the central point rigid coupling of flexible glue film is on the inner wall of one-way gas leakage cover, the security that can promote the battery.

Description

Lithium iron phosphate battery cover plate

Technical Field

The utility model relates to a technical field is preserved to the glasses, especially relates to lithium iron phosphate battery cover plate.

Background

With the popularization of new energy automobiles, it is a conventional means to use a lithium iron phosphate battery as a power battery, and when the lithium iron phosphate battery is used, abnormal gas is generated inside the battery due to the failure of a charger or excessive charging and other factors, so that the internal pressure of the battery is too high, a battery explosion accident occurs, the consequence of the explosion accident is light, equipment is damaged, and a user is injured if the consequence is heavy.

Therefore, in order to prevent the explosion caused by the over-pressure inside the battery, the gas inside the battery must be discharged, and the protection measures are usually to open an explosion-proof hole on the battery cover plate, weld an explosion-proof membrane in the explosion-proof hole, so that when the battery is overcharged or short-circuited, the gas inside the battery can be generated, the gas pressure of the battery rises, and when the gas pressure exceeds the set pressure of the explosion-proof membrane, the explosion-proof membrane is broken, the gas inside the battery is released, and the risk of the explosion of the battery is reduced. The existence of explosion-proof diaphragm can play fine explosion-proof effect to the lithium cell, but also has the defect, breaks when the rupture membrane back, and the battery is inside to switch on with the external world, and oxygen and moisture in the air get into the battery easily, cause electrified negative pole piece oxidation, make the battery temperature rise and increased the thermal runaway risk of battery.

SUMMERY OF THE UTILITY MODEL

For solving the problem mentioned in the background art, the utility model aims to provide a lithium iron phosphate battery cover plate prevents that explosion-proof diaphragm from breaking the back, inside outside air or moisture got into the battery.

In order to realize the above object, the technical scheme of the utility model is that:

lithium iron phosphate battery cover board, which comprises a substrate, the top surface insulation connection of base plate has anodal piece and negative pole piece, in between anodal piece and the negative pole piece penetrating being formed with on the base plate and annotating liquid hole and explosion-proof hole, the shutoff has explosion-proof diaphragm in the explosion-proof hole, the bottom of base plate is equipped with the insulation board, the bottom butt of insulation board has anodal piece and negative pole piece, wear to be equipped with anodal rivet and negative pole rivet jointly in base plate and the insulation board, the both ends of anodal rivet are connected with anodal piece and anodal piece respectively, the both ends of negative pole rivet are connected with negative pole piece and negative pole piece respectively, the insulation board corresponds the position of annotating the liquid hole and has seted up the liquid hole, the hole of losing heart has been seted up on the insulation board, the bottom sealing connection of base plate has one-way gas leakage cover, including one-way gas leakage cover establishes explosion-proof hole cover, one-way penetrating shaping on the gas cover has a plurality of bleeder vents, one-way gas leakage cover's inner wall has the flexible glue piece, the flexible glue piece is with a plurality of hugging closely a plurality of riser vent and seals, the rigid coupling is on one-way gas cover the inner wall of flexible glue piece, the flexible glue direction of moving direction that the bleeder vent was kept away from the bleeder vent.

Furthermore, the central point of the soft film is fixedly connected with the inner wall of the one-way air release cover through a screw and a nut.

Further, the bottom rigid coupling of base plate has many double-screw bolts, the opening edge rigid coupling of one-way gas release cover has a plurality of engaging lugs, and is a plurality of the engaging lug is established respectively on a plurality of double-screw bolts, threaded connection has nut and nut to support the engaging lug tightly in the bottom surface of base plate on the double-screw bolt.

Further, the middle part shaping of insulation board has the depressed part, the hole shaping of disappointing is in the bottom of depressed part, one-way cover that loses heart is located in the depressed part.

The utility model has the advantages that: when the inside atmospheric pressure of battery is too high, the inside high-pressure gas of battery can strike the flexible glue piece, make the flexible glue piece leave the bleeder vent, thereby can be smooth break away explosion-proof diaphragm, can not obstruct the gaseous release in battery inside, work as and when the inside atmospheric pressure of battery is unanimous with atmospheric pressure, because the flexible glue piece hugs closely the inner wall at one-way gas release cover, thereby can completely cut off oxygen and moisture outside the battery, avoid oxygen and moisture to enter into the battery through explosion-proof hole inside, reduce the risk that the battery is out of control, promote the security of battery.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is an exploded view of an embodiment of the present invention;

fig. 3 is a cross-sectional view of an embodiment of the present invention.

Description of the figure numbering: 1. the explosion-proof structure comprises a base plate, 11, a liquid injection hole, 111, a sealing nail, 12, an explosion-proof hole, 121, an explosion-proof membrane, 13, a mounting groove, 131, an insulating pad, 14, a stud, 2, a positive block, 21, a positive plate, 22, a positive rivet, 3, a negative block, 31, a negative plate, 32, a negative rivet, 4, an insulating plate, 41, a liquid passing hole, 42, a concave part, 421, an air leakage hole, 5, a one-way air leakage cover, 51, an air hole, 52, a connecting lug, 6 and a soft rubber sheet.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

As shown in fig. 1-3, the cover plate for lithium iron phosphate battery comprises a base plate 1, a positive electrode block 2 and a negative electrode block 3 respectively connected with the left and right ends of the top surface of the base plate 1 in an insulated manner, specifically, mounting grooves 13 are formed on the left and right sides of the top surface of the base plate 1, insulation pads 131 are arranged in the mounting grooves 13, the positive electrode block 2 and the negative electrode block 3 are both mounted in the mounting grooves 13 and isolated from the base plate 1 by the insulation pads 131, a liquid injection hole 11 and an explosion-proof hole 12 are formed on the base plate 1 between the positive electrode block 2 and the negative electrode block 3 in a penetrating manner, a sealing nail 111 is sealed in the liquid injection hole 11, an explosion-proof membrane 121 is sealed in the explosion-proof hole 12, an insulation plate 4 is attached to the bottom of the base plate 1, a positive electrode sheet 21 and a negative electrode sheet 31 are respectively abutted against the left and right ends of the bottom of the insulation plate 4, a positive electrode rivet 22 and a negative electrode rivet 32 are jointly penetrated through the base plate 1 and the insulation plate 4, the two ends of the positive electrode rivet 22 are respectively connected with the positive electrode block 2 and the positive electrode sheet 21, the two ends of the negative rivet 32 are respectively connected with the negative block 3 and the negative plate 31, the position of the insulating plate 4 corresponding to the liquid filling hole 11 is provided with a liquid passing hole 41, the insulating plate 4 is provided with a gas release hole 421, concretely, the middle part of the insulating plate 4 is formed with a concave part 42, the gas release hole 421 is positioned at the bottom of the concave part 42, the bottom of the substrate 1 is hermetically connected with a one-way gas release cover 5 with a prismatic inner cavity, the one-way gas release cover 5 is positioned in the concave part 42, the explosion-proof hole 12 is covered by the one-way gas release cover 5, the left and right ends of the side surface of the one-way gas release cover 5 far away from the explosion-proof hole 12 are respectively provided with a gas vent 51, the inner wall of the one-way gas release cover 5 far away from the explosion-proof hole 12 is tightly pasted with a soft rubber sheet 6, the soft rubber sheet 6 covers and seals the two gas vents 51, the central point of the soft rubber sheet 6 is fixedly connected on the inner wall of the one-way gas release cover 5 far away from the explosion-proof hole 12, the shape of the soft film 6 is corresponding to the shape of the inner side surface of the one-way air release cover 5 far away from the explosion-proof hole 12, and the left end and the right end of the soft film 6 can move towards the direction far away from the air holes 51.

In this embodiment, the center point of the soft film 6 is fixedly connected to the inner wall of the one-way venting cover 5 by screws and nuts, which is convenient for assembly.

In this embodiment, studs 14 are fixedly connected to the left and right sides of the bottom of the substrate 1, lugs 52 are fixedly connected to the left and right sides of the edge of the opening of the one-way venting cover 5, the two lugs 52 are respectively sleeved on the two studs 14, nuts are screwed on the studs 14, the lugs 52 are tightly abutted to the bottom surface of the substrate 1 by the nuts, and the one-way venting cover is reasonable in design and convenient to assemble.

In actual use, weld base plate 1 on battery case (not release in the picture), annotate the liquid back that finishes to the battery case internal, utilize sealed nail 111 will annotate the shutoff of liquid hole 11, in the in-process that the battery used, when the inside atmospheric pressure of battery is too high, the inside high-pressure gas of battery can strike flexible glue 6, thereby make the both ends upward movement of flexible glue 6 leave bleeder vent 51, thereby make the inside gas of battery can be smooth with explosion-proof diaphragm 121 break away, can not obstruct the gaseous release in battery, and when the inside atmospheric pressure of battery was unanimous with atmospheric pressure, because flexible glue 6 hugs closely the inner wall at one-way gas release cover 5, thereby can be completely cut off oxygen and moisture outside the battery, avoid oxygen and moisture to enter into the battery through explosion-proof hole 12 inside, reduce the risk that the battery is out of control.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and all modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. Lithium iron phosphate battery cover board, including base plate (1), the top surface insulation connection of base plate (1) has anodal piece (2) and negative pole piece (3), in between anodal piece (2) and negative pole piece (3) penetrating being formed with on base plate (1) annotates liquid hole (11) and explosion-proof hole (12), the shutoff has explosion-proof diaphragm (121) in explosion-proof hole (12), the bottom of base plate (1) is equipped with insulation board (4), the bottom butt of insulation board (4) has anodal piece (21) and negative pole piece (31), wear to be equipped with anodal rivet (22) and negative pole rivet (32) jointly in base plate (1) and insulation board (4), the both ends of anodal rivet (22) are connected with anodal piece (2) and anodal piece (21) respectively, the both ends of negative pole rivet (32) are connected with negative pole piece (3) and negative pole piece (31) respectively, insulation board (4) correspond the position of annotating liquid hole (11) and have seted up through liquid hole (41), set up ventilative cover (5) on insulation board (4), leak gas cover (5), leak its characteristic cover (5) including one-way gas hole (5) is connected with negative pole piece (5), the inner wall of the one-way air release cover (5) is tightly attached with a soft film (6), the soft film (6) covers and seals the air holes (51), the central point of the soft film (6) is fixedly connected to the inner wall of the one-way air release cover (5), and the part of the soft film (6) covering the air holes (51) can move towards the direction far away from the air holes (51).

2. The cover plate for lithium iron phosphate batteries according to claim 1, wherein the center point of the soft film (6) is fixedly connected to the inner wall of the one-way air release cover (5) through screws and nuts.

3. The cover plate for the lithium iron phosphate battery according to claim 1, wherein a plurality of studs (14) are fixedly connected to the bottom of the base plate (1), a plurality of connecting lugs (52) are fixedly connected to the edge of the opening of the one-way air release cover (5), the plurality of connecting lugs (52) are respectively sleeved on the plurality of studs (14), and nuts are connected to the studs (14) in a threaded manner and abut against the connecting lugs (52) on the bottom surface of the base plate (1).