CN217823024U - Power battery top cover - Google Patents

Abstract

The utility model discloses a power battery top cap, including the apron, set up in first utmost point post subassembly and second utmost point post subassembly on the apron, first utmost point post subassembly is including wearing to locate first utmost point post and first utmost point post clamp plate on the apron, second utmost point post subassembly is including wearing to locate second utmost point post and second utmost point post clamp plate on the apron, first utmost point post and first utmost point post clamp plate are made by first electrically conductive material, second utmost point post is made by second electrically conductive material, second utmost point post clamp plate is including supplying the fixed portion of wearing to establish and enclosing of wearing to locate of second utmost point post wear to establish the clamp plate body of portion periphery, the clamp plate body by first electrically conductive material is made, wear to establish the portion with the part of second utmost point post contact is made by second electrically conductive material. The power battery top cover reduces the process complexity and simplifies the pole structure by improving the second pole pressing plate structure.

Description

Power battery top cover

Technical Field

The utility model relates to a power battery field, in particular to power battery top cap.

Background

Referring to fig. 1, in order to increase the battery voltage, a plurality of single batteries are usually connected in series to form a battery module, that is, the negative electrode of the current single battery is connected to the positive electrode of the next battery, the negative electrode of the next battery is connected to the positive electrode of the next battery, … …, and so on, and the series connection is completed. Each single power battery comprises a battery body and a power battery top cover formed on the battery body, wherein a positive pole and a positive pole pressing plate, a negative pole and a negative pole pressing plate are arranged on the power battery top cover. The battery core material inside the battery body comprises a positive electrode material and a diaphragm, and a negative electrode material and a diaphragm, wherein the positive electrode material usually uses an aluminum foil as a matrix, the negative electrode material usually uses a copper foil as a matrix, the aluminum foil of the positive electrode material is connected to a positive electrode column through a positive electrode pin, and the copper foil of the negative electrode material is connected to a negative electrode column through a negative electrode pin. Since the base of the positive electrode is aluminum, the positive electrode pillar platen is typically an aluminum platen. If the base body of the negative electrode is copper and the negative pole column pressing plate is made into a copper pressing plate, the copper-aluminum series connection is easy to increase the internal resistance of the battery, increase the heat generation of the battery, increase the battery loss and reduce the service life of the battery. In order to solve the problem of large internal resistance of the copper and aluminum connecting battery, the negative pole pressing plate is made into a copper-aluminum composite pressing plate, the copper and the aluminum of the composite pressing plate are welded together through a process, so that the part of the negative pole pressing plate, which is in contact with the negative pole, is copper, and the part of the negative pole pressing plate, which is connected with the positive pole aluminum pressing plate, is aluminum, and therefore the copper and the aluminum are connected in series through the composite pressing plate to be changed into aluminum and aluminum in series. That is, referring to fig. 2, the negative pole pressing plate (copper-aluminum composite pressing plate) of the current single battery and the positive pole pressing plate (aluminum pressing plate) of the next battery are connected in series with aluminum, the copper-aluminum composite pressing plate of the next battery and the aluminum pressing plate of the next battery are connected in series, … …, and so on, and the aluminum and aluminum series connection is completed.

Referring to fig. 3 and 4, a conventional power battery top cover includes a cover plate body 100 formed with a positive post mounting hole 101 and a negative post mounting hole 102, the positive post 110 and the negative post 120 are mounted at positions of the positive post mounting hole 101 and the negative post mounting hole 102, the upper ends of the positive post 110 and the negative post 120 are respectively provided with a positive post pressing plate 130 and a negative post pressing plate 140, the negative post pressing plate 140 is a composite pressing plate, the positive post pressing plate 130 and the negative post pressing plate 140 are insulated and isolated from the cover plate body 100 by upper insulation members 150a and 150b, the positive post 110 and the negative post 120 are insulated and isolated from the cover plate body 100 by sealing rings 160a and 160b and seal an internal battery cell, the lower side surface of the cover plate body 100 is further provided with lower insulation members 170a and 170b, and the positive post 110 and the negative post 120 are electrically connected with a positive post pin 180a and a negative post pin 180b through the lower insulation members 170a and 170 b. The conventional power battery top cover has the following defects: (1) The conventional composite pressing plate comprises a pressing plate body 141 made of the same first conductive material as the positive pole 110 and a panel 142 made of the same second conductive material as the negative pole 120, wherein an embedded groove 143 for embedding the panel 142 is formed in the upper side surface of the pressing plate body 141, the depth of the embedded groove 143 is smaller than the thickness of the pressing plate, the panel 142 is embedded in the embedded groove 143 and is welded with the pressing plate body 141, and a through hole 144 penetrating through the composite pressing plate and the panel 142 in the height direction of the composite pressing plate is formed in the composite pressing plate. The composite pressing plate with the structure causes the thickness of the panel 142 to be thinner, the thinner panel 142 causes the strength to be lower, in order to increase the strength, an annular riveting part 144a needs to be arranged on the hole wall of the through hole 144 in an inward protruding mode, and when the pole is assembled, the upper end of the negative pole 120 needs to be riveted at the position of the annular riveting part 144a through a riveting process, so that the process difficulty is increased; (2) The riveting process makes the structure of the negative pole 120 more complicated, the riveting part 121 arranged on the annular riveting part 144a needs to be riveted at the upper end of the negative pole 120, when the negative pole 120 is riveted, metal wires or metal scraps are easy to appear in the riveting process, if the metal wires or the metal scraps are not cleaned up, the potential safety hazard is increased, and the power battery is easy to ignite and explode; (3) When the negative pole post 120 is riveted in the through hole 144, the riveting pressure causes the upper insulating part 150b and the lower insulating part 170b to crack and collapse, so that the composite pressing plate is inclined, and the product reject ratio is increased; (4) The bottom of the negative pole 120 needs to adopt a disc-shaped structure with a larger size to increase the torsional strength; (5) Due to the fact that the panel 142 adopts the embedding process, the material cost is high, and the manufacturing cost of the top cover of the power battery is increased; (6) When the through holes 144 of the composite pressing plate are punched, the composite pressing plate is easy to deflect and has high reject ratio.

SUMMERY OF THE UTILITY MODEL

To the not enough of above-mentioned prior art, the utility model aims to solve the technical problem that: the power battery top cover reduces the process difficulty, improves the safety of the battery top cover and simplifies the pole structure.

In order to solve the technical problem, the utility model discloses a technical scheme be: the utility model provides a power battery top cover, including the apron, set up in first utmost point post subassembly and second utmost point post subassembly on the apron, first utmost point post subassembly is including wearing to locate first utmost point post and first utmost point post clamp plate on the apron, second utmost point post subassembly is including wearing to locate second utmost point post and second utmost point post clamp plate on the apron, first utmost point post and first utmost point post clamp plate are made by first electrically conductive material, second utmost point post is made by second electrically conductive material, second utmost point post clamp plate is including supplying the second utmost point post is fixed wears to locate wherein wears to establish the portion and encloses and locates wear to establish the clamp plate body of portion periphery, the clamp plate body by first electrically conductive material makes, wear to establish the portion with the part of second utmost point post contact is made by the electrically conductive material of second.

Further, the penetrating portion comprises an inner ring made of the second conductive material and an outer ring formed on the periphery of the inner ring and made of the first conductive material, the inner ring is electrically connected with the second pole, and the outer ring is electrically connected with the pressing plate body.

Furthermore, the first conductive material is an aluminum material, the second conductive material is a copper material, the pressing plate body is an aluminum pressing plate body made of the aluminum material, the inner ring is a copper inner ring made of the copper material, and the outer ring is an aluminum outer ring made of the aluminum material.

Furthermore, the penetrating part is formed by stretching, bending and molding a composite plate with a first conductive material layer and a second conductive material layer; or

The penetrating portion is formed by friction welding of an inner ring made of a second conductive material and an outer ring made of a first conductive material.

Further, the inner ring of the penetrating portion is welded with the second pole, and the outer ring of the penetrating portion is welded with the pressing plate body.

Furthermore, a first through hole which is vertically communicated is formed in the position, corresponding to the penetrating part, of the pressing plate body, and the penetrating part is embedded in the first through hole; and a second through hole which is vertically communicated is formed in the position, corresponding to the second pole, of the penetrating part, and the second pole is embedded in the second through hole.

Furthermore, the first through hole is provided with a small-diameter hole which is smaller in diameter and penetrates through the upper side surface of the pressing plate body upwards and a large-diameter hole which is coaxially arranged at the lower end of the small-diameter hole and penetrates through the lower side surface of the pressing plate body downwards, and a limiting surface which is convex to the hole wall of the large-diameter hole in the inner direction is formed at the lower end surface of the small-diameter hole on a horizontal projection plane; the penetrating portion is provided with a small-diameter section embedded in the small-diameter hole and a large-diameter section embedded in the large-diameter hole, and the upper end face of the large-diameter section abuts against the limiting face.

Further, be formed with the confession on the apron the second pole post mounting hole of second pole post installation, the diameter of second through-hole is less than the diameter of second pole post mounting hole, the second pole post has and wears to locate cylinder in second pole post mounting hole and the second through-hole and locating the cylinder lower extreme just is located the disk body under the downside of apron, on the cylinder correspond to the position department of wearing to establish under the portion terminal surface is formed with the butt and locates support of wearing to establish under the portion terminal surface holds the face.

Further, an insulating member for insulating and isolating the second pole column assembly from the cover plate is formed between the second pole column assembly and the cover plate, the insulating member includes a first insulating portion formed between the platen body and the cover plate, and a first through hole for the column to pass through is formed in a position of the first insulating portion corresponding to the second pole column mounting hole; the insulating member further includes a second insulating portion formed between the second pole mounting hole and the column and a third insulating portion formed on a lower side surface of the cap plate, the second insulating portion having a second penetration hole through which the column penetrates.

Furthermore, the first insulating portion comprises an insulating bottom plate formed between the lower side face of the second pole pressing plate and the upper side face of the cover plate and a first insulating side plate formed by upwards extending the periphery of the insulating bottom plate, the first insulating side plate and the insulating bottom plate enclose an assembly groove for the second pole pressing plate to be assembled in, and the first penetrating hole penetrates through the bottom of the assembly groove so that the second pole mounting hole penetrates through the first penetrating hole to be communicated with the second through hole.

Further, the first insulating part, the second insulating part and the third insulating part are integrally formed; or

The first insulating part, the second insulating part and the third insulating part are respectively independent split type insulating parts; or

The first insulating part and the second insulating part are integrally formed, and the third insulating part and the integrally formed first insulating part and second insulating part are arranged in a split mode; or

The second insulating part and the third insulating part are integrally formed, and the first insulating part and the integrally formed second insulating part and the integrally formed third insulating part are arranged in a split mode.

The utility model discloses power battery top cap has following beneficial effect: (1) The composite pressing plate has the advantages that the pressing plate body of the composite pressing plate is provided with the first through hole along the thickness direction, the annular penetrating part is embedded in the first through hole, so that the thickness of the penetrating part is consistent with that of the pressing plate body, the thickness and the strength of the penetrating part are increased, the connecting strength is increased again without adopting a riveting process during pole assembling, only the pole is required to be welded with the penetrating part after penetrating the second through hole of the penetrating part, and the assembling difficulty is reduced; (2) The pole is not required to be riveted, so that the structure of the pole is simpler, the problem of metal wires or metal scraps caused by riveting can be avoided by canceling the riveting process, and potential safety hazards are reduced; (3) As the riveting process is cancelled, the problems of cracking, collapse and the like of the upper and lower insulating parts caused by riveting pressure are avoided, and the yield of products is increased; sufficient intensity (the thickness of two kinds of electrically conductive materials of portion of wearing to establish all obtains increasing, and the portion of wearing to establish of sufficient thickness makes to dissolve deeply enough, has guaranteed sufficient intensity, has increased the antitorque ability of disk body, consequently need not to increase the antitorque ability of utmost point post through riveting technology) makes the disk body size of utmost point post reduce, and utmost point post need not to design the riveting position, reduces the weight of utmost point post and makes the structure of utmost point post simpler. The penetrating part can be formed in a stretching mode, friction welding forming can also be adopted, the cost is low, and the problem of deviation caused by drawing when the traditional panel is punched and formed into the through hole does not exist.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic diagram of a plurality of unit cells in series of copper and aluminum.

Fig. 2 is a schematic diagram of a plurality of unit cells connected in series of aluminum and aluminum.

Fig. 3 is a schematic structural diagram of a top cover of a power battery in the prior art.

Fig. 4 is an assembly view of the negative electrode assembly of a top cap of a power cell of the prior art.

Fig. 5 is a schematic structural diagram of an embodiment of the power battery top cover of the present invention.

Fig. 6 is an exploded view of an embodiment of the top cover of the power battery of the present invention.

Fig. 7 is a schematic structural view of the penetration portion in fig. 6.

Fig. 8 is a sectional view of B-B in fig. 5.

Fig. 9 is an enlarged view of a portion a in fig. 8.

Fig. 10 is a schematic view of the structure of fig. 9 with the seal ring and the lower insulator removed.

The meaning of the reference symbols in the drawings is:

a cover plate body-100; a positive post mounting hole-101; a negative pole mounting hole-102; a positive post-110; negative pole column-120; a riveting part-121; a positive post pressure plate-130; negative pole clamp-140; a platen body-141; panel-142; an embedded groove-143; a through-hole-144; an annular rivet-144 a; upper insulators-150 a, 150b; seals-160 a, 160b; lower insulators-170 a, 170b; positive post pin-180 a; negative pole pin-180 b;

a cover plate-200; a first pole mounting hole-201; a second pole mounting hole-202; explosion-proof piece mounting hole-203; a liquid injection hole-204; an explosion-proof sheet-205;

a first pole assembly-300; a first pole-310; a first pole pressing plate-320;

a second pole assembly-400; a second pole-410; column-411; large outer diameter section-411 a; small outer diameter section-411 b; a butting surface-411 c; a tray-412; a first connection-413; a second pole plate-420; a piercing portion-421; copper inner ring-4211; aluminum outer ring-4212; a small diameter section-421 a; large diameter section-421 b; a second through hole-421 c; a platen body-422; a first through hole-4221; small diameter hole-4221 a; large diameter hole-4221 b; a limiting surface-4221 c;

a first post pin-510; a second stud pin-520; a first connection end-521; a second connection end-522;

an annular space-610; a first annular space-611; a second annular space-612; gap-620;

a first insulating portion-710; an insulating base plate-711; a first insulating side plate-712; a first through hole-713; a first insulating ring-714; a second insulating portion-720; an annular ring body-721; an upper ring body-721 a; a middle ring body-721 b; a lower ring body-721 c; a third insulating portion-730; insulating top plate-731; an insulating side plate-732; an insulating side ring-733; a second insulating ring-734.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some 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.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 5 and 6, the top cap of the power battery of the present invention includes a cover plate 200, and the cover plate 200 is formed with a first pole mounting hole 201, a second pole mounting hole 202, an explosion-proof sheet mounting hole 203, a liquid injection hole 204, and so on. The power battery top cover further comprises a first pole post assembly 300 arranged at the first pole post mounting hole 201, a second pole post assembly 400 arranged at the second pole post mounting hole 202, an explosion-proof sheet 205 arranged at the explosion-proof sheet mounting hole 203, and an insulating part used for enabling the first pole post assembly 300 and the second pole post assembly 400 to be insulated and isolated from the cover plate 200. The first pole post assembly 300 includes a first pole post 310 installed in the first pole post installation hole 201 and a first pole post pressing plate 320 provided at a position of an upper side of the cap plate 200 corresponding to the first pole post 310. The second pole assembly 400 includes a second pole 410 mounted in the second pole mounting hole 202 and a second pole clamp 420 provided at a position of an upper side of the cap plate 200 corresponding to the second pole 410.

In the present embodiment, the first pole mounting hole 201 is a positive pole mounting hole, and the second pole mounting hole 202 is a negative pole mounting hole. Correspondingly, the first pole post assembly 300 is a positive pole post assembly, the first pole post 310 is a positive pole post, and the first pole post press plate 320 is a positive pole post press plate; the second pole assembly 400 is a negative pole assembly, the second pole 410 is a negative pole, and the second pole pressing plate 420 is a negative pole pressing plate. The downside of apron 200 is provided with first utmost point post pin 510 (anodal post pin) and second utmost point post pin 520 (negative pole post pin), anodal post pin with anodal post electric connection, negative pole post pin with negative pole post electric connection to make anodal post pass through anodal post pin, negative pole post pass through negative pole post pin with the electric core electric connection of battery. First utmost point post 310 and first utmost point post clamp plate 320 all adopt first electrically conductive material to make, adopt the aluminium material to make usually, first utmost point post 310 and first utmost point post clamp plate 320 can adopt any kind of structure now, first utmost point post 310 and first utmost point post clamp plate 320 also can be the same or similar (the production of conveniently making) with the structure of second utmost point post 410 in the following description and second utmost point post clamp plate 420, only need make first utmost point post 310 and first utmost point post clamp plate 320 electrically conductive material set up as required can. Therefore, the structure of the first pole 310 and the first pole pressing plate 320 will not be described in detail herein.

The second pole 410 is made of a second conductive material, typically copper. The second pole pressing plate 420 is a composite pressing plate, which is formed by compounding a second conductive material and a first conductive material, that is, by compounding copper and aluminum. The second pole pressing plate 420 comprises a penetrating portion 421 for fixing the second pole 410 to penetrate through and a pressing plate body 422 surrounding the periphery of the penetrating portion 421, and the thickness of the penetrating portion 421 is matched with the thickness of the pressing plate body 422. The pressing plate body 422 is made of the first conductive material, and a portion of the penetrating portion 421 contacting the second pole 410 is made of a second conductive material. In the following description, an aluminum material is used as the first conductive material, and a copper material is used as the second conductive material.

Referring to fig. 7, in the present embodiment, the pressing plate body 422 is made of an aluminum material, and a first through hole 4221 penetrating vertically is formed at a position of the pressing plate body 422 corresponding to the penetrating portion 421. The first through hole 4221 has a small diameter hole 4221a having a small diameter and extending upward through the upper side surface of the platen body 422, and a large diameter hole 4221b coaxially disposed at the lower end of the small diameter hole 4221a and extending downward through the lower side surface of the platen body 422, wherein a lower end surface of the small diameter hole 4221a forms a stopper surface 4221c protruding inward from the hole wall of the large diameter hole 4221b on a horizontal projection plane.

Referring to fig. 6 to 9, the penetrating portion 421 is a ring structure, the penetrating portion 421 is embedded in the first through hole 4221, the penetrating portion 421 has a small diameter section 421a embedded in the small diameter hole 4221a and a large diameter section 421b embedded in the large diameter hole 4221b, and an upper end surface of the large diameter section 421b abuts against the limiting surface 4221c. A second through hole 421c is formed in the through portion 421 at a position corresponding to the second pole 410, and the second through hole 421c is vertically penetrated and is used for embedding the second pole 410 therein, and a diameter of the second through hole 421c is smaller than a diameter of the second pole mounting hole 202.

The penetrating portion 421 includes a copper inner ring 4211 made of a copper material and an aluminum outer ring 4212 formed on the periphery of the copper inner ring 4211 and made of an aluminum material, the copper inner ring 4211 is used as a portion in contact with the second pole 410, a hollow portion of the copper inner ring 4211 forms the second through hole 421c, the second pole 410 is fixedly penetrated into the copper inner ring 4211 and welded to the copper inner ring 4211, and the aluminum outer ring 4212 is welded to the pressing plate body 422 (i.e., the aluminum pressing plate body 422), so that the copper inner ring 4211 is electrically connected to the second pole 410, and the aluminum outer ring 4212 is electrically connected to the aluminum pressing plate body 422. The outer diameter of the upper section of the aluminum outer ring 4212 is smaller than that of the lower section, so that the upper section of the aluminum outer ring 4212 forms the small-diameter section 421a, and the lower section forms the large-diameter section 421b. When the copper-aluminum composite annular penetration portion 421 is manufactured, a composite plate with an inner layer of copper and an outer layer of aluminum may be formed by stretching and bending, or a copper inner ring 4211 and an aluminum outer ring 4212 may be formed by friction welding.

Referring to fig. 9 and 10, the second pole 410 has a cylinder 411 passing through the second pole mounting hole 202 and the second through hole 421c, a tray 412 disposed at a lower end of the cylinder 411 and under the lower side of the cover plate 200, and a first connection portion 413 formed at a lower side of the tray 412 and electrically connected to the second pole pin 520. The column 411 has a large outer diameter section 411a penetrating through the second pole mounting hole 202 and a small outer diameter section 411b formed at the upper end of the large outer diameter section 411a and penetrating through the second through hole 421c, and the upper end surface of the small outer diameter section 411b is exposed at the upper side surface of the second pole pressing plate 420 to form a second connection portion electrically connected to an external electrical component. The outer diameter of the large outer diameter section 411a is smaller than the inner diameter of the second pole mounting hole 202, such that an annular space 610 is formed between the large outer diameter section 411a of the second pole 410 and the second pole mounting hole 202, and the annular space 610 is used for at least part of an insulator to be placed therein to insulate and isolate the large outer diameter section 411a and the cover plate 200. The upper end surface of the large outer diameter section 411a forms an abutting surface 411c abutting against the lower end surface of the penetration portion 421 (the upper end surface of the large outer diameter section 411a of the negative pole pillar abuts against the lower end surface of the copper inner ring 4211). The lower end surface of the large outer diameter section 411a is lower than the lower side surface (the surface facing the battery cell) of the cover plate 200, and the disc body 412 is formed on the lower end surface of the large outer diameter section 411 a. The planar size of the tray body 412 is larger than the size of the second pole mounting hole 202 such that the tray body 412 has a portion overlapping the cover plate 200 in a horizontal plane projection, and the upper side of the tray body 412 is lower than the lower side of the cover plate 200, so that a gap 620 is formed between the upper side of the tray body 412 and the lower side of the cover plate 200, the gap 620 being for an insulator to be at least partially placed there to isolate the tray body 412 from the cover plate 200. The first connection portion 413 is protruded on the lower side surface of the tray 412 to form a connection protrusion, the connection protrusion is welded to the second pole pin 520 (also called a flexible connection sheet), and the insulation member is at least partially formed between the second pole pin 520 and the lower side surface of the cover plate 200 to insulate and separate the cover plate 200 from the second pole pin 520.

Referring to fig. 6, 9 and 10, the insulating member includes a first insulating portion 710 formed between the second pole pressing plate 420 and the cover plate 200, a second insulating portion 720 formed between the second pole mounting hole 202 and the column 411, and a third insulating portion 730 formed on the lower side surface of the cover plate 200. The first insulating portion 710, the second insulating portion 720 and the third insulating portion 730 are integrally formed; or the first insulation part 710, the second insulation part 720 and the third insulation part 730 are separate insulation parts; or the first insulating part 710 and the second insulating part 720 are integrally formed, and the third insulating part 730 is separately arranged from the integrally formed first insulating part 710 and second insulating part 720; or the second insulating portion 720 and the third insulating portion 730 are integrally formed, and the first insulating portion 710 is separated from the integrally formed second insulating portion 720 and third insulating portion 730.

In this embodiment, the first insulating portion 710, the second insulating portion 720 and the third insulating portion 730 are separately provided, the first insulating portion 710 is disposed between the upper surface of the cap plate 200 and the second pole pressing plate 420 to form an upper insulating member, the second insulating portion 720 is disposed between the second pole mounting hole 202 and the column 411 of the second pole 410 to form a sealing ring, and the third insulating portion 730 is a lower insulating member formed on the lower surface of the cap plate 200.

The upper insulating member includes an insulating bottom plate 711 formed between the lower side of the second pole pressing plate 420 and the upper side of the cover plate 200, and a first insulating side plate 712 extending upward from the periphery of the insulating bottom plate 711, the first insulating side plate 712 and the insulating bottom plate 711 enclose a fitting groove into which the second pole pressing plate 420 is fitted, a first through hole 713 is formed at a position of a groove bottom of the fitting groove (i.e., the insulating bottom plate 711) corresponding to the second pole mounting hole 202, and the first through hole 713, the second pole mounting hole 202, and the second through hole 421c are coaxially arranged in a communicating manner. A first insulating ring 714 embedded in the second pole mounting hole 202 is protruded downwards around the hole of the first through hole 713 at the lower side of the insulating base plate 711, an outer ring surface of the first insulating ring 714 is tightly attached to the hole wall of the second pole mounting hole 202, a lower end surface of the first insulating ring 714 is lower than the upper side surface of the cover plate 200 and higher than the lower side surface of the cover plate 200, and an inner diameter of the first insulating ring 714 is smaller than an inner diameter of the second pole mounting hole 202 and larger than an outer diameter of the large outer diameter section 411a of the column 411, so that a first annular space 611 is formed between the first insulating ring 714 and the large outer diameter section 411 a. A second annular space 612 is formed between the space of the second pole mounting hole 202 located at the lower side of the first insulating ring 714 and the large outer diameter section 411a, and the upper end of the second annular space 612 communicates with the first annular space 611 to form the annular space 610.

The sealing ring includes an annular ring body 721 and a second through hole formed in the annular ring body 721, a large outer diameter section 411a of the second pole 410 passes through the second through hole, the annular ring body 721 has an upper section ring body 721a formed in the first annular space 611, a middle section ring body 721b formed in the second annular space 612, and a lower section ring body 721c formed between the disc body 412 and the lower side surface of the cover plate 200, the outer diameter of the lower section ring body 721c is smaller than the transverse dimension of the disc body 412, and on a horizontal projection plane, the outer peripheral edge of the disc body 412 exceeds the outer peripheral edge of the lower section ring body 721c, that is, the outer peripheral edge of the lower section ring body 721c does not extend into a space between the outer peripheral edge of the disc body 412 and the lower side surface of the cover plate 200.

The lower insulating member includes an insulating top plate 731 covering a lower surface of the cap plate 200, and a second insulating side plate 732 extending downward from an outer end of the insulating top plate 731, and the insulating top plate 731 and the second insulating side plate 732 are integrally formed in a 7-shaped structure. An insulating side ring 733 provided on the outer periphery of the tray body 412 is formed on the insulating top plate 731 at a position corresponding to the outer periphery of the tray body 412, a second insulating ring 734 is formed by extending the upper end surface of the insulating side ring 733 horizontally inward, the second insulating ring 734 is located between the outer periphery of the tray body 412 and the lower side surface of the lid plate 200, and the inner periphery of the second insulating ring 734 abuts against the outer periphery of the lower ring body 721 c.

The second pole pin 520 has a first connection end 521 and a second connection end 522, the first connection end 521 is formed on the lower side of the insulating top plate 731 and welded to the first connection part 413, the second connection end 522 is formed on the inner side of the second insulating side plate 732, the second connection end 522 and the first connection end 521 are integrally formed into a "7" shaped structure, and the second connection end 522 is electrically connected to the battery cell.

The utility model discloses power battery top cap is as follows at the equipment flow: (1) welding a terminal pin with a terminal; (2) Assembling the sealing ring on the pole (3) assembling the pole pressing plate and the upper insulating part; (4) welding an explosion-proof sheet 205 on the cover plate 200; (5) installing a lower insulating part on the lower side surface of the cover plate 200; (6) The pole is arranged in the pole mounting hole in a penetrating way and is welded with the pole pressing plate on the upper side surface of the cover plate 200; and (7) assembling the explosion-proof membrane. The utility model discloses power battery top cap has following beneficial effect: (1) The first through hole 4221 is formed in the pressing plate body 422 of the composite pressing plate along the thickness direction of the pressing plate body, the annular penetrating part 421 is embedded in the first through hole 4221, so that the thickness of the penetrating part 421 is consistent with that of the pressing plate body 422, the thickness and the strength of the penetrating part 421 are increased, a riveting process is not needed to be adopted to increase the connection strength again when the pole is assembled, the pole is only required to be welded with the penetrating part 421 after being penetrated in the second through hole 421c of the penetrating part 421, and the assembling difficulty is reduced; (2) The pole is not required to be riveted, so that the structure of the pole is simpler, the problem of metal wires or metal scraps caused by riveting can be avoided by canceling the riveting process, and potential safety hazards are reduced; (3) As the riveting process is cancelled, the problems of cracking, collapse and the like of the upper and lower insulating parts caused by riveting pressure are avoided, and the yield of products is increased; sufficient intensity (the thickness of two kinds of electrically conductive materials of wearing to establish portion 421 all obtains increasing, and the portion 421 of wearing to establish of sufficient thickness makes the depth of solution enough, has guaranteed sufficient intensity, has increased the antitorque ability of disk body 412, consequently need not to increase the antitorque ability of utmost point post through riveting technology) makes the disk body 412 size of utmost point post reduce, and utmost point post need not to design the riveting position, reduces the weight of utmost point post and makes the structure of utmost point post simpler. The penetrating portion 421 can be formed by stretching, or by friction welding, and has low cost, and the problem of deviation caused by punching through holes of the traditional panel is avoided.

The above examples only represent preferred embodiments of the present invention, and the description thereof is more specific and detailed, but should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (11)

1. The utility model provides a power battery top cap, include the apron, set up in first utmost point post subassembly and second utmost point post subassembly on the apron, first utmost point post subassembly is including wearing to locate first utmost point post and first utmost point post clamp plate on the apron, second utmost point post subassembly is including wearing to locate second utmost point post and second utmost point post clamp plate on the apron, first utmost point post and first utmost point post clamp plate are made by first electrically conductive material, second utmost point post is made by the electrically conductive material of second, its characterized in that: the second pole pressing plate comprises a penetrating part for the second pole to fixedly penetrate through and surround the periphery of the penetrating part, the pressing plate body is made of a first conductive material, and the penetrating part is made of a second conductive material.

2. The power battery top cap of claim 1, wherein: the penetrating portion comprises an inner ring made of the second conductive material and an outer ring formed on the periphery of the inner ring and made of the first conductive material, the inner ring is electrically connected with the second pole, and the outer ring is electrically connected with the pressing plate body.

3. The power cell header of claim 2, wherein: the first electrically conductive material is the aluminium material, and the electrically conductive material of second is the copper product, the clamp plate body is the aluminium clamp plate body of being made by the aluminium material, the inner ring be by the copper inner ring that the copper product was made, the outer loop be by the aluminium outer loop that the aluminium material was made.

4. The power cell header of claim 2, wherein: the penetrating part is formed by stretching, bending and molding a composite plate with a first conductive material layer and a second conductive material layer; or

The penetrating portion is formed by friction welding of an inner ring made of a second conductive material and an outer ring made of a first conductive material.

5. The power battery top cover of claim 2, wherein: the inner ring of the penetrating part is welded with the second pole, and the outer ring of the penetrating part is welded with the pressing plate body.

6. The power battery top cap of any one of claims 1-5, wherein: a first through hole which is vertically communicated is formed in the position, corresponding to the penetrating part, of the pressing plate body, and the penetrating part is embedded in the first through hole; and a second through hole which is vertically communicated is formed in the position, corresponding to the second pole, of the penetrating part, and the second pole is embedded in the second through hole.

7. The power battery top cover of claim 6, wherein: the first through hole is provided with a small-diameter hole which is smaller in diameter and upwards penetrates through the upper side face of the pressing plate body and a large-diameter hole which is coaxially arranged at the lower end of the small-diameter hole and downwards penetrates through the lower side face of the pressing plate body, and a limiting face which is inwards protruded on the hole wall of the large-diameter hole is formed at the lower end face of the small-diameter hole on a horizontal projection plane; the penetrating portion is provided with a small-diameter section embedded in the small-diameter hole and a large-diameter section embedded in the large-diameter hole, and the upper end face of the large-diameter section abuts against the limiting face.

8. The power cell header of claim 7, wherein: be formed with the confession on the apron the second pole mounting hole of second pole installation, the diameter of second through-hole is less than the diameter of second pole mounting hole, the second pole has and wears to locate cylinder in second pole mounting hole and the second through-hole and locating the cylinder lower extreme just is located the disk body under the downside of apron, correspond to on the cylinder the position department of wearing to establish under the portion terminal surface is formed with the butt in wear to establish under the portion terminal surface support hold the face.

9. The power cell header of claim 8, wherein: an insulating piece used for insulating and isolating the second pole column assembly from the cover plate is formed between the second pole column assembly and the cover plate, the insulating piece comprises a first insulating part formed between the pressing plate body and the cover plate, and a first penetrating hole for the column body to penetrate through is formed in the first insulating part at the position corresponding to the second pole column mounting hole; the insulating member further includes a second insulating portion formed between the second pole mounting hole and the column and a third insulating portion formed on a lower side surface of the cap plate, the second insulating portion having a second penetration hole through which the column penetrates.

10. The power cell header of claim 9, wherein: the first insulation part comprises an insulation bottom plate formed between the lower side face of the second pole pressing plate and the upper side face of the cover plate and a first insulation side plate formed by upward extending of the periphery of the insulation bottom plate, the first insulation side plate and the insulation bottom plate are enclosed to form an assembly groove for the second pole pressing plate to be assembled in, and the first penetrating hole penetrates through the groove bottom of the assembly groove so that the second pole mounting hole penetrates through the first penetrating hole to be communicated with the second through hole.

11. The power cell header of claim 9, wherein: the first insulating part, the second insulating part and the third insulating part are integrally formed; or

The first insulating part, the second insulating part and the third insulating part are respectively independent split type insulating parts; or

The first insulating part and the second insulating part are integrally formed, and the third insulating part and the integrally formed first insulating part and second insulating part are arranged in a split mode; or

The second insulating part and the third insulating part are integrally formed, and the first insulating part and the integrally formed second insulating part and the integrally formed third insulating part are arranged in a split mode.

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