CN214542379U - Sealing structure of battery box and power battery box - Google Patents

Abstract

The embodiment of the utility model provides a pair of seal structure and power battery box of battery box, seal structure includes: an upper housing having a circumferentially extending upper flange; a lower housing having a circumferentially extending lower flange; a backing member disposed between the upper flange and the lower flange such that the upper flange, the lower flange, and together with the upper flange and the lower flange, form an outwardly facing notch; the sealant takes the backing piece as a backing and is filled in the notch; the limiting piece is arranged in the notch; and the fastening piece sequentially penetrates through the upper flange, the limiting piece and the lower flange and fastens the upper flange, the limiting piece and the lower flange.

Description

Sealing structure of battery box and power battery box

Technical Field

The utility model relates to a technical field of battery box encapsulation especially relates to a seal structure and power battery box of battery box.

Background

The battery box is a battery box group consisting of a plurality of single battery boxes, a box body, a battery box management system, relevant installation structural members (equipment) and the like, and is provided with a battery box structure, battery box monitoring equipment, a battery box connector, battery box environment control equipment and the like which meet the standard.

The sealing and water proofing of the shell of the power battery box is vital to the insulation of the internal battery box module and a power supply system. The shell of the power battery box is thin due to the requirement of light weight of an automobile, the wall thickness of the sealing surface of the shell is generally smaller than 5mm, the size of a bolt fastener is generally smaller than M10, and M5 bolt fasteners are mostly adopted.

The method is characterized in that a sealing glue which is formed and cured in place is coated on the flange surface of a lower shell (or an upper shell) of the existing power battery box, the sealing glue can be one-component moisture curing or two-component A/B component reaction curing, the upper shell and the lower shell are assembled before the sealing glue which is formed in place is cured, the upper shell is pressed on the lower shell and fastened by bolts, after the sealing glue is cured, a chemical bonding sealing gasket (CIPG) is formed, the CIPG forms bonding on the flange surfaces of the upper shell and the lower shell, the thickness of the CIPG is generally 0.1 mm-3 mm, and the CIPG is fastened and clamped with a bolt fastener to realize sealing. In order to achieve the sealing effect, the CIPG is required to have high bonding strength which is generally more than 1MPa, and the technical defect is that when the flange seal established by the CIPG method is disassembled and repaired, the destructive force is more than the bonding force of the CIPG, so that the structure of the shell flange is damaged by disassembling, and the shell flange cannot be sealed again and repaired for many times.

However, the inventor of the present application finds that at least the following technical problems exist in the prior art:

in the prior art, the technical problems that when the flange seal established by the CIPG method is disassembled and repaired, the destructive force is larger than the adhesive force of the CIPG, the disassembly damages the structural deformation of the shell flange, and the shell flange can not be sealed again and repaired for many times exist.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a seal structure and power battery case of battery box for when solving the sealed disassembling of the flange that establishes through the CIPG method that exists among the prior art and reprocessing, will the destructive power be greater than CIPG's adhesion, lead to disassembling the structural deformation who harms the shell flange, can not be sealed once more and reprocess the technical problem.

The embodiment of the utility model adopts the following technical scheme:

an embodiment of the utility model provides a seal structure of battery box, seal structure includes:

an upper housing having a circumferentially extending upper flange;

a lower housing having a circumferentially extending lower flange;

a backing member disposed between the upper flange and the lower flange such that the upper flange, the lower flange, and together with the upper flange and the lower flange, form an outwardly facing notch;

the sealant is filled in the groove opening;

a limiting piece, which is arranged in the notch,

and the fastening piece sequentially penetrates through the upper flange, the limiting piece and the lower flange.

Furthermore, the sealing glue is filled and covered on the limiting part.

Further, the fastener is located the sealed glue one side that deviates from the backing member.

Furthermore, the fastener comprises a bolt and a nut, and a stud of the bolt sequentially penetrates through the upper flange, the limiting piece and the lower flange and penetrates out of the lower flange to be in threaded connection with the nut.

Further, the back lining piece is a double-faced adhesive tape.

Further, the thickness of the backing member is 6mm-12 mm.

The embodiment of the utility model provides a power battery box is still provided, power battery box includes the seal structure as foretell battery box.

Compared with the prior art, the utility model discloses an embodiment's beneficial effect lies in:

an embodiment of the utility model provides a seal structure of battery box, seal structure includes: an upper housing having a circumferentially extending upper flange; a lower housing having a circumferentially extending lower flange; a backing member disposed between the upper flange and the lower flange such that the upper flange, the lower flange, and together with the upper flange and the lower flange, form an outwardly facing notch; the sealant takes the backing piece as a backing and is filled in the notch; the limiting piece is arranged in the notch; and the fastening piece sequentially penetrates through the upper flange, the limiting piece and the lower flange and fastens the upper flange, the limiting piece and the lower flange.

The embodiment of the utility model provides a seal structure of battery box, when disassembling, take out the fastener through loosening earlier to cancel the fastening force between upper flange, lower flange and the locating part, and then open instrument such as cutter and cut the incision to sealant and backing member, wherein, more preferred mode is, take out the locating part through the instrument before the incision to make the cutter in the process of cutting, can cut through sealant and backing member high-efficiently and fast, thereby can not injure upper flange and lower flange; when the battery box is reassembled and sealed after being disassembled, the backing piece is removed firstly, the residual sealant is cut off by a cutter along the lower surface of the upper flange and the upper surface of the lower flange, then the sealing structure of the battery box is formed through reassembly, violent disassembly is not needed, the upper flange and/or the lower flange cannot be damaged in the disassembling process, and the battery box can be repeatedly used for many times, so that the technical problems that the structural deformation of the flange of the shell is damaged due to disassembling when the breaking force is larger than the CIPG bonding force during disassembling and repairing of the flange seal established by a CIPG method in the prior art, and the sealing and repairing cannot be performed again are solved effectively.

The sealing structure of the embodiment has the functions of dismantling and repairing, and dismantling and repairing the sealing again and for multiple times, and can reach the depth of two meters in water immersion and maintain the 24-hour water-tightness IP68 waterproof grade.

The embodiment of the utility model provides a power battery box is still provided, power battery box includes the seal structure as foretell battery box, power battery box has solved the sealed flange that establishes through the CIPG method among the prior art effectively and has disassembled when reprocessing, will the destructive power be greater than CIPG's adhesion, leads to disassembling the structural deformation who damages the shell flange, can not be sealed once more and reprocess many times technical problem.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only the embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural view of a rivet nut with a sealing structure of a battery box according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a sealing structure of a battery box according to an embodiment of the present invention;

fig. 3 is a schematic view of a first structure of a sealing structure of a battery box according to an embodiment of the present invention when disassembled;

fig. 4 is a second schematic structural diagram of the sealing structure of the battery box according to the embodiment of the present invention when disassembled;

fig. 5 is a sectional view of a disassembled lower case of a sealing structure of a battery box according to an embodiment of the present invention;

fig. 6 is a plan view of a disassembled lower case of a sealing structure of a battery box according to an embodiment of the present invention.

Wherein:

100. an upper housing; 110. an upper flange; 200. a lower housing; 210. a lower flange; 211. pulling and riveting the nut; 300. a backing member; 400. sealing glue; 500. a limiting member; 600. a bolt; 601. a fastener; 602. and a nut.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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.

In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, a fixed connection, an exchangeable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, unless otherwise explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. In the present invention, the terms "first" and "second" do not denote any particular quantity or order, but are merely used to distinguish names.

In the sealing structure of some embodiments:

comparative example 1: a solid sealing gasket (gasket) is mounted between an upper shell and a lower shell of a power battery box, the gasket is generally a rubber gasket made of a solid rubber type nonmetal flat gasket (with bolt holes on a full-plane full face) or a foaming type silicon rubber plate, the thickness of the initial gasket is generally 1 mm-3 mm, the rubber gasket is fastened and clamped by a bolt fastener 601 to be thinned to 0.8 mm-1.5 mm, and sealing is realized by applying enough pressure on the solid sealing gasket in a pressing mode. The technical defects of the sealing structure are as follows: the sealing gasket and the sealing surface have no chemical bonding force, the compression of the bolt fastening force is required to be kept large enough and uniformly distributed on the sealing gasket, the power battery box is installed on a vehicle, the initial fastening force of the bolt is reduced due to the long-term vibration of the vehicle and the creep relaxation of the sealing gasket material, even if the bolt is bonded by anti-loosening thread locking glue, the sealing grade can only reach the IP67 technical level (the national standard: GB38031-2020 specification, the water depth of 15cm, and the immersion time of 30 minutes);

comparative example 2: in some embodiments, the sealing structure is formed by coating a sealant formed in situ on a flange surface of a lower shell (or an upper shell) of a power battery box to form a solid sealing gasket (FIPG), wherein the sealant can be one-component moisture curing or two-component a/B component reaction curing, the FIPG forms adhesion to the flange surface of the lower shell (or the upper shell), the FIPG is cured into solid rubber, the surface has no viscosity, and when the upper shell and the lower shell are assembled, the solid rubber is fastened and clamped by using a bolt fastener 601; it is necessary to apply sufficient pressure to compress the solid gasket to effect a seal. The sealing gasket solves the problems that a liquid forming sealing gasket can adjust physical forming along with the shape of a flange sealing surface, reduces the joint defect of the sealing gasket which is spliced into a whole by using a plurality of sections of solid sealing films, and can not improve the waterproof grade compared with a fixed rubber gasket;

comparative example 3: for example, in the background art, a sealant which is formed and cured in place is coated on a flange surface of a lower shell (or an upper shell) of an existing power battery box, the sealant can be one-component moisture curing or two-component A/B component reaction curing, the upper shell and the lower shell are assembled before the sealant which is formed in place is cured, the upper shell is pressed on the lower shell, after the sealant is cured, a chemically bonded gasket seal (CIPG) is formed, the CIPG forms bonding on the flange surfaces of the upper shell and the lower shell, the thickness of the CIPG is generally 0.1 mm-3 mm, and the CIPG is fastened and clamped with a bolt fastener 601 to realize sealing. In order to achieve the sealing effect, the CIPG is required to have high bonding strength which is generally more than 1MPa, and the technical defect is that when the flange seal established by the CIPG method is disassembled and repaired, the destructive force is more than the bonding force of the CIPG, so that the structure of the shell flange is damaged by disassembling, and the shell flange cannot be sealed again and repaired for many times.

After the implementation of the CIPG sealing structure, the inventors found that the following problems exist in the CIPG sealing structure: on one hand, the upper flange and the lower flange need to be tightly sealed by sealant, on the other hand, when the flange seal established by the CIPG method is adopted, although the higher sealing grade can be achieved, the upper flange and the lower flange need to be disassembled by the destructive force larger than the adhesive force of the CIPG when the upper flange and the lower flange are disassembled and repaired, the structural deformation of the shell flange is damaged by disassembly, the flange cannot be sealed again, namely, the sealing structure has the higher requirement on tightly sealing the upper flange and the lower flange, but when the tight seal is realized by adopting the chemical bonding sealing gasket, when the shell of the light and thin battery box is disassembled and repaired, the structure of the flange of the shell is damaged by violently disassembling and disassembling, the upper shell and the lower shell cannot be reused, the battery box cannot be repaired again after being disassembled, the cost is increased, and the disassembling efficiency is lower, namely, the existing sealant in the prior art is contradictory with the high bonding strength established by the upper flange and the lower flange and the low breaking strength required by easy disassembly.

As shown in fig. 1, fig. 1 is a schematic structural diagram of a sealing structure of a battery box according to an embodiment of the present invention;

as shown in fig. 1 to 6, the present embodiment provides a sealing structure of a battery case, the sealing structure including:

an upper housing 100, said upper housing 100 having a circumferentially extending upper flange 110;

a lower housing 200, said lower housing 200 having a circumferentially extending lower flange 210;

a backing member 300, the backing member 300 being disposed between the upper flange 110 and the lower flange 210 to connect the upper flange 110 and the lower flange 210 and to form an outward facing notch together with the upper flange and the lower flange;

the sealant 400 takes the backing piece 300 as a backing and is filled in the groove;

the limiting piece 500 is arranged in the notch, and the limiting piece 500 is arranged in the notch;

and a fastening member 601, wherein the fastening member 601 sequentially passes through the upper flange 110, the stopper 500 and the lower flange 210, and fastens the three.

The upper shell 100 and the lower shell 200 are assembled for packaging a power battery box;

wherein the backing member 300 is disposed between the lower surface of the upper flange 110 and the upper surface of the lower flange 210;

the method specifically comprises the following steps: the backing member 300 is a double-sided adhesive tape, and a first protective layer is removed from a first side of the double-sided adhesive tape, so that an adhesive on the first side is exposed and is attached to the lower surface of the upper flange 110; removing a second protective layer from a second surface of the double-sided adhesive tape, so that the adhesive on the second surface is exposed and is attached to the upper surface of the lower flange 210, so that the upper flange 110 and the lower flange 210 can be fixed together through the double-sided adhesive tape, and the position where the double-sided adhesive tape is attached is located at one end, close to the inner side of the power battery box, of the upper flange 110 and the lower flange 210;

preferably, the backing member 300 is disposed on the inner edges of the upper and lower cases 100 and 200 extending outward, such that the upper flange 110, the lower flange 210 and the backing member 300 together form a notch opening outward;

the backing member 300 may also be an adhesive, or a single-sided foam sticker with one side attached to the lower surface of the upper flange 110 or the upper surface of the lower flange 210, where the single-sided foam sticker has sufficient thickness and certain compression performance, so that when the upper flange 110 presses the lower flange 210, the upper flange 110, the lower flange 210 and the backing member 300 together form a notch opening outwards, which can serve as a support for the backing member, and the upper flange 110 and the lower flange 210 support a notch opening with a certain thickness (6mm-12mm), and the adhesive that can realize that the backing member 300 is stretched between the upper flange 110 and the lower flange 210 to form the notch opening outwards may be the backing member 300 of this embodiment.

The back lining piece 300 can play a role in preventing the sealant from entering the battery box when the sealant is injected; and the back lining piece can form a sealing surface when the sealant is filled with the glue, so that the sealant can form a compact sealing groove sealing continuous body between the upper flange and the lower flange, and the sealing structure achieves the IP68 waterproof grade (equivalent to no water leakage after 24-hour immersion in 2m water depth).

Wherein the thickness of the backing member 300 is preferably 6mm to 12 mm;

the sealant 400 can be a single-component or two-component sealant 400, and can be a silicone SR type, a polyurethane PU type, a silane modified polymer SMP type sealant 400 or a PUR sealant, a hot melt butyl sealant.

The sealant 400 may be injected into the notch by a manual or automatic means.

After the glue is injected, the sealant 400 in the notch may be cured by heating or cooling, absorbing moisture in the air, or by reaction and cross-linking between the a/B components, and the sealant 400 has an adhesive and sealing effect on the lower surface of the upper flange 110 and the upper surface of the lower flange 210 after being cured.

Preferably, the sealant 400 is continuously and fully contacted with the lower surface of the upper flange 110 and the upper surface of the lower flange 210 without pore defects by means of tool pressing, so that the sealing effect is better.

The fastener 601 includes a bolt 600 and a nut 602, and a stud of the bolt 600 sequentially passes through the upper flange 110, the retainer 500 and the lower flange 210, and passes through the lower flange 210 to be in threaded connection with the nut 602, so as to fasten the upper flange 110, the retainer 500 and the lower flange 210 together.

In addition, the fastening member 601 may be a bolt alone, the lower flange has a rivet nut 211, and the fastening member 601 passes through the upper flange 110, the stopper 500, and the lower flange 210 and is screwed to the rivet nut 211 of the lower flange, thereby fastening the upper flange 110, the stopper 500, and the lower flange 210 together.

Specifically, a first hole is formed in the upper flange 110, a second hole is formed in the lower flange 210, a third hole is formed in the limiting member 500, the fastening member 601 sequentially passes through the first hole, the second hole, and the third hole, and penetrates out of the third hole, and the limiting member 500 is fastened between the upper flange 110 and the lower flange 210 by adjusting the fastening member 601 to be fastened to a proper degree.

The limiting member 500 may be a limiting nut, a metal sheet with a hole in the middle, or a non-metal plate; the limit nut can be a limit metal nut.

The limiting member 500 plays a role in spacing in the thickness direction of the gap between the upper flange 110 and the lower flange 210, that is, the gap is supported between the upper flange 110 and the lower flange 210, so that on one hand, the sealant 400 is protected from being squashed, crushed or extruded to flow outwards, and the problem of reduced sealing effect is avoided;

the limiting part 500 can play a role in supporting the interval between the upper flange 110 and the lower flange 210, so that a sealing layer with relative thickness is formed after sealant is injected, when the sealing layer is disassembled, the fastening part 601 is taken out by loosening firstly to cancel the fastening force among the upper flange, the lower flange and the limiting part, enough space is provided for cutting, a cutter is directly inserted into the sealing layer and penetrates out of the back lining part, and the cutting can be smoothly carried out to cut and separate the sealing layer.

The thickness of the limiting member 500 is smaller than that of the backing member 300, the backing member 300 deforms after the upper flange and the lower flange are pressed against each other, and the thickness of the limiting member 500 is 3mm to 6 mm; the sealing structure can be disassembled, and a working gap for cutting by inserting a cutter is reserved.

After the fastening piece 601 is locked, the fastening piece 601 plays a bearing role for the stress of the whole sealing structure. Under the action that the fastening piece 601 locks the upper flange 110 and the lower flange 210, the adhesion force of the sealant 400 to the upper flange 110 and the lower flange 210 can keep the upper flange 110 and the lower flange 210 from falling off when vibrated, and waterproof sealing is realized by elastic adhesion sealing; because the upper flange 110 and the lower flange 210 are mechanically fastened by the fastener 601 adopted in the sealing structure, the sealant 400 is not required to have high bonding strength, the sealant with cohesive strength can be adopted, the disassembly is convenient, and the sealing structure can be suitable for more sealants 400.

After the bolts 600 are fastened, the sealant 400 is cured, the curing mode may be determined according to the actually used sealant 400, and after the sealant 400 is cured, physical or chemical adhesion is formed between the upper flange 110 and the lower flange 210, so as to achieve an excellent sealing effect.

In addition, the fastening member 601 may pass through the upper flange 110, the limiting member 500, and the lower flange 210 to fasten, and then the sealant 400 may be injected into the notch to seal, and in the sealing structure, the sealant 400 is filled and covered on the limiting member 500. In this seal configuration, the upper flange 110 and the lower flange 210 have built up strength under the tightening of the fasteners 601 and can be moved on-line without waiting for the sealant 400 to cure. After the sealant 400 is cured, adhesion is formed on the surfaces of the upper flange 110 and the lower flange 210, so that an excellent sealing effect is achieved.

In order to enable the sealant 400 to be filled better and enable a better assembling effect between the upper flange 110 and the lower flange 210, the fastening member 601 is located on a side of the sealant 400 facing away from the double-sided tape. Because the backing member 300 is disposed at one end of the upper flange 110 close to the inner side of the upper casing 100, that is, the fastening member 601 is located at one side of the sealant 400 departing from the double-sided tape, the stress formed between the upper flange 110 and the lower flange 210 can be more uniform.

As shown in fig. 2 to 5, when the sealing structure of the present application needs to be disassembled, the fastening member 601 and the retaining member 500 can be removed by a wrench tool, the notch between the flange surfaces is exposed, and a sharp mechanical knife is used to insert the sealant 400 to penetrate the backing member 300, and the cutting is performed along the circumferential direction until the sealant 400 and the backing member 300 are completely cut, as shown in fig. 4 and 5, after the cutting, the sealant 400 and the backing member 300 are divided into upper and lower separated parts to be attached to the upper flange 110 and the lower flange 210, so that the separation of the upper casing 100 and the lower casing 200 can be performed.

The utility model provides a seal structure except that the cutter that adopts machinery cuts, can also adopt to draw the cutting colloid with the steel wire line, specifically is: the sealant and the backing piece are cut and separated by drawing the steel wire wires when the sealant is disassembled by embedding 1 thin steel wire inside. In this way, the height of the limit nut can be reduced to 3 mm.

When it is desired to make a seal again, cleaning of the lower surface of the upper flange 110 and the upper surface of the lower flange 210 can be performed: the residual backing piece 300 on the lower surface of the upper flange 110 and the upper surface of the lower flange 210 is manually or mechanically removed, the backing piece 300 is generally glued or double-sided glued and can be removed by simply tearing, and then a cutter is used for cutting off the residual sealant 400 along the lower surface of the upper flange 110 and the upper surface of the lower flange 210 until only a thin layer of sealant 400 with the thickness less than 1mm is arranged on the lower surface of the upper flange 110 and the upper surface of the lower flange 210, so that a small amount of sealant 400 is allowed to remain, and the sealant 400 can be extruded only by enough notch space after assembly. This removal removes only the sealant 400 from the lower surface of the upper flange 110 and the upper surface of the lower flange 210 without involving a large external force and damaging the outer shapes of the upper case 100 and the lower case 200.

The utility model discloses a seal structure can gain following effect:

1. compared with the CIPG sealing mode of directly fastening by bolts 600 and combining with the sealant 400, the CIPG sealing structure can only achieve IP67 waterproof grade, the sealing structure of the application can achieve IP68 waterproof grade, and the gap tolerance between the upper flange 110 and the lower flange 210 can also achieve waterproof sealing after the upper flange 110 and the lower flange 210 are assembled through the back lining piece 300 and the fastening piece 601 under the conditions of low processing precision and uneven flatness.

The flange that the CIPG method was established is sealed to be compared, the utility model discloses a seal structure possesses the ability of can disassembling and reprocessing, and its method of disassembling realizes easily, need not destroy flange 110 and/or lower flange 210 in the violence to make and go up casing and lower casing can used repeatedly.

3. After the sealing glue 400 is removed from the disassembled upper flange 110 and lower flange 210, the upper casing 100 and lower casing 200 can be sealed again and repeatedly disassembled and sealed for many times.

4. The utility model discloses a back spare 300 and locating part 500 have been adopted to sealed structure, the cost is low, do not need additionally to increase big spare part cost, the form of casing 100 and lower casing 200 also need not to change, in addition, the mode of sealed glue 400 is refilled through preceding fastener 601, can be when sealed glue 400 does not accomplish the solidification, just possess power battery box structure bearing capacity, can directly move the power battery box with covering and continue processing in next process, and need not wait for sealed glue 400 and just remove after solidifying completely, the effectual machining efficiency who promotes the power battery box.

5. The bearing of structural force is done by fastener 601, and sealed glue 400 only plays the effect of bonding and sealed waterproof dirt-proof, just no longer requires sealed glue 400 to play the necessary high adhesion strength of structural bonding effect, and the utility model discloses an easy convenient disassembling can be realized to this kind of sealed structure, does not exist to sealed glue 400 that exists among the prior art and the high adhesion strength that upper flange 110 and lower flange 210 established and the required low breaking strength of disassembling easily be the problem of contradiction.

The embodiment of the utility model also provides a power battery box, which comprises a sealing structure of the battery box; the power battery box effectively solves the technical problems that when an upper shell 200 and a lower shell 200 of a sealing structure in the prior art are assembled in an alignment mode, the shells are unevenly deformed, gaps between upper flange sealing surfaces and lower flange sealing surfaces are uneven, the distribution of fastening force of bolts 600 is difficult to be symmetrical and even, the sealing grade cannot meet the standard requirement, and the sealing effect is poor. And effects brought by the sealing structure can be obtained.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

The first embodiment of the sealing structure of the battery box is as follows:

the upper shell 100 and the lower shell 200 are made of carbon steel materials and protected by electrophoretic anti-corrosion paint, the upper shell 100 is located above the lower shell 200, the width of a sealing surface is about 20mm, a double-faced adhesive tape with the thickness of 6mm and the width of 6mm is firstly pasted and placed along the inner edge, close to the lower shell 200, of the lower flange 210 on the lower surface of the upper flange 110, a protective layer on the surface of the double-faced adhesive tape is removed, the first hole, aligned to the upper shell 100, of the upper shell is pressed on the double-faced adhesive tape by means of self weight, the double-faced adhesive tape plays a role in temporary fixation, and meanwhile, a notch with an outward opening is formed between the upper flange and the lower flange.

And (2) taking a double-faced adhesive tape as a backing from the direction of a notch between the upper flange 110 and the lower flange 210, continuously injecting a thixotropic single-component silicone sealant inwards, continuously extruding and injecting along the lower surface of the upper flange 110 and/or the circumferential direction of the upper surface of the lower flange 210, and if necessary, wiping by using a tool to ensure that the sealant 400 is continuously and fully contacted with the upper flange 110 and the lower flange 210 without pore defects.

The injected glue amount is proper, the sealing width of the sealing glue 400 from the double-sided adhesive tape to the outside can be generally between 3mm and 15mm, and the sealing glue does not invade the first hole and the third hole. Placing a limiting nut between the first hole of the upper flange 110 and the third hole of the lower flange 210, wherein the second hole of the limiting nut is aligned with the first hole and the third hole respectively; stop nut's height is 5 ~ 6mm or takes the stopper in M5 bolt 600 hole, and spacing height 5 ~ 6mm penetrates bolt 600 from last first hole and penetrates through stop nut's second hole and wear out from third hole down again, sheathes in nut 602 and lock the fastening to suitable degree, and stop nut fastens this moment. And repeating the locking work at each limit nut of the power battery box in sequence. After the sealant 400 has cured to a solid and formed a bond over time, the sealant 400 acts as a seal.

When the sealing structure needs to be disassembled, the bolt 600 can be removed by a wrench tool, and the limit nut is taken out; at this time, the notch between the upper flange 110 and the lower flange 210 is exposed, the sealant 400 is inserted into the double-sided adhesive tape by a sharp mechanical cutter, the double-sided adhesive tape is cut along the circumferential direction until the sealant 400 is completely cut, and after the cutting, the sealant 400 and the double-sided adhesive tape are divided into upper and lower parts which are attached to the lower surface of the upper flange 110 and the upper surface of the lower flange 210, so that the upper case 100 and the lower case 200 can be separated.

The utility model provides a seal structure except that the cutter that adopts machinery cuts, can also adopt to draw the cutting colloid with the steel wire line, specifically is: the sealant and the backing piece are cut and separated by drawing the steel wire wires when the sealant is disassembled by embedding 1 thin steel wire inside. In this way, the height of the limit nut can be reduced to 3 mm.

When a re-sealing is required, a preparation for cleaning the lower surface of the upper flange 110 and the upper surface of the lower flange 210 may be performed: the residual double-sided adhesive tape is manually or mechanically removed, and then a cutter is used for cutting off the residual sealant 400 along the lower surface of the upper flange 110 and the upper surface of the lower flange 210 until only a thin layer of sealant 400 with the thickness smaller than 1mm is arranged on the lower surface of the upper flange 110 and the upper surface of the lower flange 210, so that a small amount of sealant 400 is allowed to be left on the lower surface of the upper flange 110 and/or the upper surface of the lower flange 210 (as long as enough notch space is available for squeezing the sealant 400 after assembly). The process of removing the sealant 400 only on the lower surface of the upper flange 110 and the upper surface of the lower flange 210 of the housing does not involve a large external force and does not damage the shape of the upper housing 100 and/or the housing.

After the flange surfaces are cleaned, the upper flange 110 and the lower flange 210 are aligned again, pressed on a new double-sided adhesive tape again, then the sealant 400 is extruded, and the bolt 600 is locked through a limiting nut or a limiting block; and repeated assembly is realized again.

Second embodiment of the sealing structure of the battery box:

the lower casing 200 of aluminum alloy material, the nonmetal upper casing 100 of SMC, the lower surface of upper flange 110 and the upper surface width of lower flange 210 are about 25mm, on the upper surface of lower flange 210, adopt earlier 8mm thick, width 8 mm's double faced adhesive tape, its position pastes along the inner edge of the upper surface of lower flange 210 and puts, removes the protective layer on double faced adhesive tape surface, leans on dead weight pressfitting to paste on the double faced adhesive tape after will going up casing 100 counterpoint first hole, the double faced adhesive tape pastes and plays the effect of temporary fixation, makes to form outside open-ended notch between upper flange and the lower flange simultaneously.

And then, a limiting nut is arranged between the upper flange 110 and the lower flange 210, the limiting height is 5-6 mm or a limiting block (the limiting height is 5-6 mm) with an M5 bolt 600 hole penetrates through a second hole passing through the limiting nut from a first hole of the upper flange and then penetrates out from a third hole of the lower flange, a nut 602 is sleeved on the upper flange to be locked and fastened to a proper degree, and the limiting nut is fastened at the moment. The above-described bolt 600 is repeated at the positions where the first hole and the third hole are provided in order to lock the limit nut to the fastening position. At this time, the bolt 600 coupling has firmly assembled the upper case 100 and the lower case 200 together, and the thickness of the double-sided tape is compressed from the initial 8mm thickness to about 6 mm.

And (2) taking a double-faced adhesive tape as a backing from the direction of a notch between the upper flange 110 and the lower flange 210, continuously injecting the MS modified silicone sealant 400 which is prepared by mixing two components with thixotropy according to a proportioning ratio inwards, and continuously extruding along the lower surface of the upper flange 110 and/or the circumferential direction of the upper surface of the lower flange 210, so that the sealant 400 is continuously and fully contacted with the upper flange 110 and the lower flange 210 and has no pore defects.

The amount of the injected sealant is slightly excessive to allow a small amount of sealant to overflow from the notch, and then the sealant 400 is densely filled by scraping along the ends of the upper flange 110 and the lower flange 210 with a squeegee. The sealant 400 is attached to the double-sided adhesive tape from the end portions of the upper flange 110 and the lower flange 210, and the sealing width of the sealant can be generally 1-20 mm. When the sealant 400 is cured to a solid and form a bond, the sealant 400 acts as a seal.

The advantage of this implementation is that the entire power cell box can be moved before the sealant 400 is completely cured, and the bolts 600 are used to support the structural stress without waiting for the time for the sealant to completely cure.

When the sealing structure needs to be disassembled, as in the disassembling method of the first embodiment, the fastening member 601 of the bolt 600 and the stop nut or the stop block are removed by using a tool such as a wrench and a cutter. At this time, the notches between the lower surface of the upper flange 110 and/or the upper surface of the lower flange 210 are exposed, the sealant 400 is inserted by a sharp mechanical cutter and penetrates through the double-sided adhesive tape, the cutting is performed in the circumferential direction until the sealant 400 is completely cut, the sealant 400 and the double-sided adhesive tape are divided into upper and lower divided parts to be attached to the upper and lower flanges, and at this time, the upper and lower cases 200 can be separated.

When it is necessary to perform a reassembly seal, a preparation for cleaning the lower surface of the upper flange 110 and the upper surface of the lower flange 210 may be performed: firstly, manually or mechanically removing the double-sided adhesive tape, and then cutting off the residual sealant 400 along the lower surface of the upper flange 110 and the upper surface of the lower flange 210 by using a cutter until only a thin layer of sealant 400 with the thickness less than 1mm is arranged on the flange surface, so that a small amount of sealant 400 is allowed to remain (as long as enough notch space is available for squeezing the sealant 400 after assembly). Such removal removes only the sealant 400 on the lower surface of the upper flange 110 and the upper surface of the lower flange 210, and does not involve a large external force and damage the outer shapes of the upper and lower cases 100 and 200.

After the cleaning of the lower surface of the upper flange 110 and the upper surface of the lower flange 210 is completed, the first holes of the upper shell and the lower shell 200 can be aligned again, the upper shell and the lower shell are pressed on a new double-faced adhesive tape again, the stop nut assembly bolt 600 is repeatedly placed for locking, the sealant 400 is extruded in the circumferential direction until the sealant is full, and then the end part is scraped and repaired.

The third specific embodiment of the sealing structure of the battery box is as follows:

the lower shell 200 made of carbon steel and the upper shell 100 made of SMC nonmetal have the width of about 25mm, a double-sided adhesive tape with the thickness of 8mm and the width of 8mm is firstly attached to the sealing surface of the lower shell 200 along the inner edge of the lower flange 210 close to the lower shell 200, a protective layer on the surface of the double-sided adhesive tape is removed, the first hole in the alignment of the upper shell 100 is pressed on the double-sided adhesive tape by self weight, the double-sided adhesive tape plays a role in temporary fixation, and meanwhile, a notch with an outward opening is formed between the upper flange and the lower flange.

And then, a limit nut is arranged between the upper flange 110 and the lower flange 210, the limit height range is 6-12 mm or a limit block (limit height 6-12 mm) with an M5 bolt 600 hole, the bolt 600 penetrates through a second hole passing through the limit nut from a first hole and then penetrates out from a third hole, a nut 602 is sleeved to be locked and fastened to a proper degree, and the limit nut is fastened at the moment. And repeating the bolt 600 penetrating process at each bolt 600 hole position in sequence, and locking the bolt to the fastening position of the limiting nut. At this time, the bolt 600 coupling has firmly assembled the upper and lower cases 100 and 200 together.

And (2) taking a double-faced adhesive tape as a backing from the direction of a notch between the upper flange 110 and the lower flange 210, continuously injecting a two-component SPUR silane modified polyurethane sealant 400 with thixotropy after proportioning mixing inwards, and continuously extruding and injecting along the lower surface of the upper flange 110 and/or the circumferential direction of the upper surface of the lower flange 210, so that the sealant 400 is continuously and fully contacted with the upper flange 110 and the lower flange 210 and has no air hole defect.

The amount of the injected paste is slightly excessive to allow a small amount of the paste to overflow from the notch, and then the paste is scraped along the ends of the upper flange 110 and the lower flange 210 by a squeegee, and the paste 400 is densely and fully filled by the scraping. The sealant 400 is attached to the double-sided adhesive tape from the end portions of the upper flange 110 and the lower flange 210, and the sealing width thereof may generally be 5 to 20 mm. When the sealant 400 is cured to a solid and form a bond, the sealant 400 acts as a seal.

The advantage of this implementation is that the entire power cell box can be moved before the sealant 400 is completely cured, and the bolts 600 are used to support the structural stress without waiting for the time for the sealant to completely cure.

When the above-described assembly structure needs to be disassembled, the bolt 600 is removed from the fastening member 601 and the stopper nut by a tool such as a wrench and a cutter, as in the disassembling method of the sealing method according to the first embodiment. At this time, the notches between the lower surface of the upper flange 110 and/or the upper surface of the lower flange 210 are exposed, the sealant 400 is inserted into the notches by a sharp mechanical cutter and penetrates through the double-sided adhesive tape, the sealant 400 is cut along the circumferential direction until the sealant 400 is completely cut, the cut sealant 400 and the double-sided adhesive tape are divided into upper and lower separated parts to be attached to the upper flange and the lower flange, and at this time, the upper and lower cases 200 can be separated.

When the resealing is required, a preparation for cleaning the lower surface of the upper flange 110 and the upper surface of the lower flange 210 may be performed: firstly, manually or mechanically removing the double-sided adhesive tape, and then cutting off the residual sealant 400 along the lower surface of the upper flange 110 and the upper surface of the lower flange 210 by using a cutter until only a thin layer of sealant 400 with the thickness less than 1mm is arranged on the flange surface, so that a small amount of sealant 400 is allowed to remain (as long as enough notch space is available for squeezing the sealant 400 after assembly). The removal of the sealant 400 only removes the sealant on the lower surface of the upper flange 110 and the upper surface of the lower flange 210, and does not involve a large external force and damage the outer shapes of the upper case 100 and the lower case 200.

After the cleaning of the lower surface of the upper flange 110 and the upper surface of the lower flange 210 is completed, the second holes of the upper and lower shells 200 can be aligned again, pressed on a new double-sided adhesive tape again, the stop nut assembly bolt 600 is repeatedly placed for locking, the sealant 400 is extruded in the circumferential direction until the sealant is full, and then the end portion is scraped and repaired.

To the utility model discloses seal structure and power battery case that provide in the implementation carry out the test of automobile industry's GB38031-2020, carry out the shaking table vibration, carry out the test of soaking again, and above-mentioned seal structure can both reach whole submergence at the 2m depth of water, keeps 24 hours after, disassembles the detection, does not have the water trace and is used for instructing the water of infiltration to become red label paper and keep unchangeable.

To the utility model discloses seal structure and power battery case that provide in the implementation carry out the auto industry and carry out the extrusion deformation back according to the standard, carry out the waterproof test of IP68 grade again, and above-mentioned seal structure can both reach whole submergence and keep 24 hours after at the 2m depth of water, disassembles the detection, does not have the water trace and is used for instructing the water of infiltration to become red label paper and keep unchangeable.

An embodiment of the utility model provides a seal structure can realize reaching the waterproof grade of IP 68.

The utility model discloses an embodiment seal structure is as follows with other structure relative ratio:

comparison 1:

this group compares the test, has verified the seal structure of utility model's embodiment, has more reliable bonding waterproof grade, reduces in total bolt quantity, behind the bolt interval grow, still can seal when bolt-up power descends, also has the function that can disassemble reassembling.

Comparison 2:

this group compares the experiment, has verified that utility model's seal structure can accomplish to disassemble, can assemble once more, and CIPG's mode does not possess can disassemble reassembling.

Comparison 3:

this group's experiment has verified that the seal structure of this embodiment can be applicable to the flange material of different materials, establishes bonding seal, satisfies to carry out the water logging experiment again after the shaking table experiment and also satisfies waterproof requirement.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (7)

1. A sealing structure of a battery case, characterized in that the sealing structure comprises:

an upper housing having a circumferentially extending upper flange;

a lower housing having a circumferentially extending lower flange;

a backing member disposed between the upper flange and the lower flange to connect the upper flange and the lower flange and to form an outward facing notch together with the upper flange and the lower flange;

the sealant takes the backing piece as a backing and is filled in the notch;

the limiting piece is positioned in the notch;

and the fastening piece sequentially penetrates through the upper flange, the limiting piece and the lower flange and fastens the upper flange, the limiting piece and the lower flange.

2. A sealing structure of a battery box according to claim 1, wherein said sealant covers said stopper.

3. A sealing structure of a battery box according to claim 1, wherein said fastener is located on a side of said sealant facing away from said backing member.

4. The sealing structure of a battery box according to claim 1, wherein the fastener comprises a bolt and a nut, and a stud of the bolt passes through the upper flange, the retainer and the lower flange in this order and is screwed with the nut.

5. The sealing structure of battery box according to claim 1, wherein the backing member is a double-sided tape.

6. A sealing structure of a battery case according to claim 1, wherein the thickness of the backing member is 6mm to 12 mm.

7. A power cell box, characterized in that the power cell box comprises a sealing structure of the cell box according to any one of claims 1-6.

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