CN219739093U - Monopole post battery cover plate - Google Patents

Abstract

The utility model discloses a monopole column battery cover plate, which comprises a superposed baffle plate and an optical cover plate, wherein a pole column assembly is arranged on the optical cover plate, and a step groove structure for limiting and accommodating the pole column assembly is arranged on the baffle plate; the light cover plate is provided with a step hole structure, and the partition plate is provided with a vent hole; the anti-explosion device further comprises an adhesive layer and an anti-explosion piece, wherein the anti-explosion piece is arranged between the step hole structure and the vent hole, the adhesive layer is made of a hot-melt material, and side gaps between the anti-explosion piece and the step hole structure and between the anti-explosion piece and the vent hole are sealed after the adhesive layer is hot-melted; at least one part of vent holes are opened when the explosion-proof piece bears the explosion pressure; the explosion-proof piece is fixed between the step hole structure and the vent hole through the adhesive layer, the vent hole is sealed, and after the explosion pressure is reached in the battery, the explosion-proof piece is tilted relatively, so that at least one part of the vent hole is opened, and pressure relief is realized.

Description

Monopole post battery cover plate

Technical Field

The utility model relates to the technical field of batteries, in particular to a monopole column battery cover plate.

Background

With the continuous expansion of new energy industry, lithium ion batteries are widely used as an important component of new energy industry. The square aluminum shell lithium ion battery is widely applied to the fields of power and energy storage batteries because of simple structure, higher energy density and high safety performance. In the existing packaging structure, the pole core is placed in the square shell in the middle, only one explosion-proof valve is arranged in the middle or on one side of the battery, a large amount of gas can be rapidly generated when the battery is in internal short circuit, external impact or external high temperature, the gas pressure intensity of the gas reaches the explosion-proof valve detonation intensity, the explosion-proof valve is exploded, and the gas is discharged from the explosion-proof valve, so that the risk of explosion of the secondary battery is reduced, and the safety of the secondary battery is improved.

As disclosed in chinese patent CN107293656a, a battery cover plate structure and a battery capable of exhausting at high temperature, the disclosure date is 2017.10.24, and it is specifically described that the battery cover plate structure includes a vent hole provided on the cover plate, and the vent hole is filled with a hot-melt material, so that the vent hole is sealed, and the cover plate can be ensured to be in a sealed state in normal operation. When the external environment temperature of the battery is relatively hot or the inside breaks down to generate larger heat, the cover plate is heated to a temperature exceeding the melting point of the hot-melting material, the hot-melting material is melted, so that the exhaust hole is communicated, the inside and the outside of the cover plate are communicated, the pressure in the battery is released, and the explosion of the battery is avoided.

The above patent discloses that when the exhaust hole is filled with the hot-melt material and then reaches the melting point according to the heating of the hot-melt material, the exhaust hole is conducted after the hot-melt material is melted, the melting point of the hot-melt material is generally about 120 degrees, and the pressure of the explosion-proof exhaust of the battery is required to be more safely satisfied in a wider range, if the exhaust hole is blocked by the hot-melt material, the internal air pressure is required to reach the exhaust pressure but the pressure cannot be released for reaching the melting point, the explosion risk may exist.

Disclosure of Invention

First technical problem

The utility model aims to provide a monopole column battery cover plate, which solves the structural scheme that the monopole column battery cover plate is applied to the monopole column battery cover plate and can realize sensitive pressure relief within a safety pressure range, and improves the problem that in the prior art, a hot-melt material is adopted to seal an exhaust hole, and the explosion risk of a battery possibly exists because the temperature does not reach the melting point of the hot-melt material but the internal air pressure reaches the safety pressure.

(II) technical scheme

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the single-pole battery cover plate comprises a stacked partition plate and an optical cover plate, wherein a pole assembly is arranged on the optical cover plate, and a step groove structure for limiting and accommodating the pole assembly is arranged on the partition plate; the light cover plate is provided with a step hole structure, and the partition plate is provided with a vent hole; the anti-explosion device further comprises an adhesive layer and an anti-explosion piece, wherein the anti-explosion piece is arranged between the step hole structure and the vent hole, the adhesive layer is made of a hot-melt material, and after the adhesive layer is hot-melted, side gaps between the anti-explosion piece and the step hole structure and between the anti-explosion piece and the vent hole are sealed; the rupture disk opens at least a portion of the vent hole when carrying detonation pressure.

Preferably, a ventilation isolation plate is arranged in the ventilation hole, the ventilation isolation plate comprises an annular structure and at least two connecting parts arranged on the circumference of the annular structure, and the connecting parts are fixed on the inner wall of the ventilation hole.

Preferably, the adhesive layer is provided with an inner hole structure, and the maximum outer diameter of the edge of the adhesive layer is larger than that of the edge of the explosion-proof sheet.

Preferably, the shape of the explosion-proof sheet and the adhesive layer is a circle or a polygon.

Preferably, the adhesive layer is provided with conductive material particles; the conductive material particles are one of carbon black particles, graphene particles or carbon nanotube particles.

Preferably, the hot-melt material is one of polypropylene, chlorinated polypropylene resin or composite resin.

Preferably, the initial thickness of the adhesive layer is 0.15mm-0.2mm, and the sintering thickness of the adhesive layer is 30% -60% of the initial thickness.

Preferably, the pole assembly comprises a mounting hole arranged on the optical cover plate and a sealing ring sleeved in the mounting hole; the sealing ring is fixedly connected with the conducting block, the conducting block is arranged in the step groove structure, and an insulating sealing gasket used for isolating the conducting block from the optical cover plate is further arranged in the step groove structure.

Preferably, at least one clamping hole is formed at two ends of the partition board, and a clamping column matched with the clamping hole is arranged on the optical cover board.

Preferably, both ends of the partition board are provided with convex shell structures extending away from one side of the light cover plate, and reinforcing rib plates are arranged in the convex shell structures; the clamping hole site penetrates through the convex shell structure.

(III) beneficial effects

1. The adhesive layer is made of a hot-melt material, the explosion-proof sheet is fixed between the step hole structure and the vent hole through the adhesive layer, the vent hole is sealed, and after the explosion pressure is reached in the battery, the explosion-proof sheet is tilted relative to the second base part, so that at least one part of the vent hole is opened, and pressure relief is realized; in the prior art, a structure for directly sealing the vent hole by adopting a hot melt material can reach detonation pressure when the melting point is not reached but the internal pressure critical point is reached, and the situation that pressure can not be released in time can exist;

2. the hot melt adhesive strength can be adjusted by controlling the hot melt thickness of the adhesive layer, so that the detonation pressure of the explosion-proof piece is adjusted, the adjustment and control in the range of 0.3-2.0Mpa are realized, and the method is applicable to scenes such as lithium iron phosphate batteries, sodium ion batteries and the like except lithium batteries;

3. the material of the bonding object is not limited by adopting a hot melt bonding mode, so that the variety of the application of the material in the battery cover plate can be increased;

4. the adhesive layer is made of a hot-melt material, the explosion-proof sheet is fixed, so that the explosion pressure can be reduced in a high-temperature environment, and the explosion pressure can be increased at normal temperature, so that the use safety of the battery in the high-temperature environment can be further improved;

5. the explosion-proof piece is limited by the step hole structure on the light cover plate and the vent holes on the partition plate after being detonated, so that the explosion-proof piece can be prevented from flying out.

Drawings

FIG. 1 is a schematic view of an exploded view of a first embodiment of the present utility model;

FIG. 2 is a schematic diagram of a second view of an exploded structure according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a third perspective of an exploded view of an embodiment of the present utility model;

FIG. 4 is a schematic diagram of an assembled structure of an embodiment of the present utility model;

FIG. 5 is a schematic view of the structure of an adhesive layer according to an embodiment of the present utility model;

in fig. 1 to 5, the correspondence between the component names or lines and the drawing numbers is:

the structure comprises a step hole structure 1, a vent hole 2, an adhesive layer 3, an inner hole structure 30, a explosion-proof sheet 4, a ventilation isolation plate 5, an annular structure 51, a connecting part 52, a partition plate 6, a step groove structure 60, a clamping hole site 61, a convex shell structure 62, a reinforcing rib plate 63, an optical cover plate 7, a clamping column 70, a pole column assembly 8, a mounting hole 80, a sealing ring 81, a conductive column 82, a conductive block 83 and an insulating sealing pad 84.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

Referring to fig. 1, 2, 3 and 4, in an embodiment of the present utility model, a monopolar column battery cover plate is provided, which includes a separator 6 and an optical cover plate 7, wherein the optical cover plate 7 is overlapped with the separator 6, a pole assembly 8 is disposed on the optical cover plate 7, and a step groove structure 60 for limiting and accommodating the pole assembly 8 is disposed on the separator 6; the explosion-proof valve is arranged on the cathode battery cover plate, but can be arranged on the anode battery cover plate, and can be selected according to actual conditions, wherein the explosion-proof valve comprises a step hole structure 1 arranged on the optical cover plate 7, the big hole end of the step hole structure 1 faces to one side of the partition plate 6, and a vent hole 2 is arranged on the partition plate 6; the anti-explosion vent structure is characterized by further comprising an adhesive layer 3 and an anti-explosion piece 4, wherein the anti-explosion piece 4 is arranged between the step hole structure 1 and the vent holes 2, the adhesive layer 3 is made of a hot-melt material, and after the adhesive layer 3 is hot-melted, side gaps between the anti-explosion piece 4 and the step hole structure 1 and between the anti-explosion piece 4 and the vent holes 2 are sealed, so that the anti-explosion piece 4 seals the vent holes 2, and when the anti-explosion piece 4 is fixed, the adhesive layer 3 is firstly placed into the step hole structure 1 to be positioned, after the whole structure is heated to 105-120 ℃, the anti-explosion piece 4 is covered on the adhesive layer 3 to form a relative position to be fixed, the anti-explosion piece is continuously heated to 125-140 ℃, and after the temperature is kept for 10-15 s, the anti-explosion piece 4 is reliably fixed between the step hole structure 1 and the vent holes 2, and the vent holes 2 are sealed.

When the explosion-proof piece 4 bears the explosion pressure, at least a part of the vent holes 2 are opened, and the internal pressure can be released after the vent holes 2 are opened, so that the risk of explosion of the battery is avoided; the explosion-proof sheet 4 is a metal sheet or a composite material, and the specific composite material can be one of aluminum PP, aluminum P I, aluminum PE or aluminum PMMA, and the materials can be manufactured more easily and more efficiently through stamping or cutting. In order to be convenient for adapt to the comparatively even atress of atress and can realize deviating from the atress of baffle direction when detonating, let explosion-proof piece 4 have the bellied arc structure of deviating from the baffle direction.

Specifically, at least one clamping hole site 61 is provided at two ends of the partition board 6, the optical cover board 7 is provided with a clamping column 70 matched with the clamping hole site 61, and the clamping column 70 and the clamping hole site 61 can be fixed relatively between the optical cover board 7 and the partition board 6 by adopting modes of hot melting and fixing; the light cover plate 7 and the first base part are in an integrated structure, and the second base part and the partition plate 6 are in an integrated structure, so that the stability and the structural strength of the whole structure can be improved.

In order to improve the mounting stability and reliable support of the rupture disk 4 in the vent hole 2, as shown in fig. 2, a vent isolation plate 5 is provided in the vent hole 2, the vent isolation plate 5 includes a ring structure 51 and at least two connection parts 52 provided in the circumferential direction of the ring structure 51, the connection parts 52 are fixed on the inner wall of the vent hole 2, the vent isolation plate 5 formed by the ring structure 51 and the connection parts 52 has an air passage for allowing the vent hole 2 to be always communicated, and the reliable support of the rupture disk 4 can be realized.

In order to adapt to the adhesion force adjustment after the adhesion layer 3 is hot melted and avoid causing the condition that leads to the fact the cover to air vent 2, also can guarantee simultaneously that to explosion proof piece 4 reliably fix, as shown in fig. 5, offer hole structure 30 on adhesion layer 3, the accessible is adjusted the adhesion force after the sintering after width, thickness and the quantity of adhesion layer 3 are adjusted and is controlled, and let the biggest external diameter in edge of adhesion layer 3 is greater than the biggest external diameter in explosion proof piece 4 edge to can guarantee that adhesion layer 3 can stabilize fixedly to explosion proof piece 4 after the hot melting.

Specifically, the shapes of the explosion-proof sheet 4 and the adhesive layer 3 can be round, polygonal or irregular, and the vent hole 2 and the step hole structure 1 matched with the explosion-proof sheet and the adhesive layer also have the same structure, so that the structural adaptability adjustment can be carried out according to the use requirement.

Meanwhile, conductive material particles are arranged in the adhesive layer 3, and are one of carbon black particles, graphene particles or carbon nano-tube particles, and the carbon black particles, the graphene particles or the carbon nano-tube particles can be uniformly arranged in the adhesive layer 3 when the adhesive layer 3 is formed after being fused into a hot-melt material, so that the adhesive layer 3 has a conductive function, the conduction between an explosion-proof valve and a cover plate after installation can be realized, and the function that electrolyte cannot corrode the explosion-proof sheet 4 can be realized.

Specifically, the hot-melt material may be one of polypropylene (PP), chlorinated polypropylene resin (CPP) or a composite resin, so as to be suitable for fixing the explosion-proof sheet 4 by hot melting, and after the above materials are adopted for hot-melt bonding, materials such as steel, various injection molding materials or aluminum plastic films can be adapted, and the shape of the explosion-proof sheet 4 can be freely adjusted.

In order to adjust the bonding acting force after hot melting and meet the control of the detonation pressure, the initial thickness of the adhesive layer 3 is 0.15-0.2 mm, the fusion thickness formed by the adhesive layer 3 after hot melting is 30-60% of the initial thickness, the detonation pressure can be flexibly adjusted by adjusting and combining the parameters of the use amount, the width and the like of the hot-melting material according to the fusion thickness, and particularly, the detonation pressure can be adapted between 0.3Mpa and 2.0 Mpa.

As shown in fig. 3, the pole assembly 8 includes a mounting hole 80 formed in the optical cover plate 7 and a sealing ring 81 sleeved in the mounting hole 80; the light cover plate further comprises a conductive column 82 and a conductive block 83, wherein the conductive column 82 passes through the sealing ring 81 and is fixedly connected with the conductive block 83, the conductive block 83 is arranged in the step groove structure 60, and an insulating sealing pad 84 for isolating the conductive block 83 from the light cover plate 7 is further arranged in the step groove structure 60; the conductive post 82 is connected to the conductive block 83 to conduct between the inside and the outside of the battery. Meanwhile, convex shell structures 62 extending away from one side of the light cover plate 7 are arranged at two end parts of the partition plate 6, and reinforcing rib plates 63 are arranged in the convex shell structures 62; the clamping hole position 61 penetrates through the convex shell structure 62; the convex hull structure 62 can increase the electrical isolation distance after the partition board 6 is installed and fixed, and improves the safety.

In the structure, after the hot melt connection of the explosion-proof sheet 4 is realized through the adhesive layer 3 made of the hot melt material, the detonation pressure can be regulated, and the detonation sensitivity is improved; the explosion-proof piece 43 can also be protected, the fixation mode by adopting the welding mode and the like is avoided, the detonation safety and reliability degree is improved, and the explosion-proof piece is suitable for the structure of the vent hole 2 with various structural shapes to adapt.

In addition, it should be noted that, in the above embodiment, the explosion-proof sheet 4 may be a composite material other than a metal sheet, and the specific composite material may be one of aluminum PP, aluminum P I, aluminum PE or aluminum PMMA, and the specific composite material may be a hot-melt material as an internal hot-melt layer, and the composite material and the internal hot-melt layer are thermally combined to form an integral structure, and then the surface of the composite material is coated with a nylon material for hydrophobic property.

When the vent hole 2 is sealed, the structure after compounding is directly placed in the groove, then the aluminum plastic film is fixed in the groove by heating to enable the inner hot-melting layer to be hot-melted, and the vent hole 2 is sealed, so that the adhesive layer 3 can be avoided being used secondarily, namely, the hot-melting material is directly compounded on the composite material, wherein the thickness of the composite material can be between 0.072mm and 0.1mm, and the composite material has reliable strength and is convenient to be hot-compounded with the inner hot-melting layer.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (10)

1. The utility model provides a monopole post battery cover plate, includes superimposed baffle (6) and light apron (7), be equipped with utmost point post subassembly (8) on light apron (7), be equipped with on baffle (6) and be used for spacing holding step groove structure (60) of utmost point post subassembly (8);

the method is characterized in that:

the light cover plate (7) is provided with a step hole structure (1), and the partition plate (6) is provided with a vent hole (2);

the anti-explosion vent structure comprises a step hole structure (1), an air vent (2) and an adhesive layer (3) and an anti-explosion piece (4), wherein the anti-explosion piece (4) is arranged between the step hole structure (1) and the air vent (2), the adhesive layer (3) is made of a hot-melt material, and the adhesive layer (3) is sealed after hot melting to form side gaps between the anti-explosion piece (4) and the step hole structure (1) and between the anti-explosion piece (4) and the air vent (2);

and when the explosion-proof sheet (4) bears the explosion pressure, at least one part of the vent holes (2) are opened.

2. A monopolar column cell cover plate according to claim 1 and wherein: the ventilation hole (2) is internally provided with a ventilation isolation plate (5), the ventilation isolation plate (5) comprises an annular structure (51) and at least two connecting parts (52) arranged on the circumference of the annular structure (51), and the connecting parts (52) are fixed on the inner wall of the ventilation hole (2).

3. A monopolar column cell cover plate according to claim 1 and wherein: an inner hole structure (30) is formed in the adhesive layer (3), and the maximum outer diameter of the edge of the adhesive layer (3) is larger than that of the edge of the explosion-proof sheet (4).

4. A monopolar column cell cover plate according to claim 3 and wherein: the shape of the explosion-proof sheet (4) and the shape of the adhesive layer (3) are round or polygonal.

5. A monopolar column cell cover plate according to claim 1 and wherein: conductive material particles are arranged in the adhesive layer (3);

the conductive material particles are one of carbon black particles, graphene particles or carbon nanotube particles.

6. A monopolar column cell cover plate according to claim 1 and wherein: the hot melt material is one of polypropylene, chlorinated polypropylene resin or composite resin.

7. A monopolar column battery cover plate according to any of claims 1-6 and wherein: the initial thickness of the adhesive layer (3) is 0.15mm-0.2mm, and the sintering thickness of the adhesive layer (3) is 30% -60% of the initial thickness.

8. A monopolar column cell cover plate according to claim 1 and wherein: the pole assembly (8) comprises a mounting hole (80) formed in the optical cover plate (7), and a sealing ring (81) sleeved in the mounting hole (80);

still include conductive post (82) and conducting block (83), conductive post (82) pass sealing washer (81) with conducting block (83) rigid coupling, conducting block (83) set up in step groove structure (60), still be equipped with in step groove structure (60) and be used for keeping apart conducting block (83) with insulating sealing pad (84) of light apron (7).

9. The monopolar column cell cover plate of claim 8, wherein: both ends of baffle (6) all are equipped with at least one block hole site (61), be equipped with on the optical cover plate (7) with block post (70) of block hole site (61) complex.

10. A monopolar column cell cover plate according to claim 9 and wherein: convex shell structures (62) extending away from one side of the light cover plate (7) are arranged at two ends of the partition plate (6), and reinforcing rib plates (63) are arranged in the convex shell structures (62);

the clamping hole position (61) penetrates through the convex shell structure (62).