CN220553511U - Top cap and battery - Google Patents

Abstract

The application discloses top cap and battery belongs to battery technology field. The top cover includes: the solar cell comprises a pole, a hot-press mounting piece, an insulating plate and a cover plate, wherein the pole is connected with the cover plate through the hot-press mounting piece, the pole is mounted on the hot-press mounting piece, an overflow groove is formed in the pole, and the hot-press mounting piece is at least partially filled in the overflow groove. In this application, the hot press mount becomes viscous and has tackiness to bond the post and the cover plate together when subjected to hot pressing, i.e., heating and pressurizing. The overflow groove is formed in the pole, when the hot-pressing installation piece is subjected to hot pressing, the excessive part of the hot-pressing installation piece can enter the overflow groove and is filled in the overflow groove after solidification, so that the uneven condition of the surface of the top cover can be avoided, and the welding reliability of the top cover is ensured.

Description

Top cap and battery

Technical Field

The application belongs to the technical field of batteries, and particularly relates to a top cover and a battery.

Background

With the continuous development of new energy automobiles, the requirements on the reliability, the safety, the small size and the light weight of the power battery are higher and higher. Currently, the mainstream battery monomer forms in the market include three forms of square aluminum shells, cylinders and soft packages, wherein square aluminum shell batteries are widely used due to the advantages of light weight, good heat dissipation, high sealing performance and the like.

To the heat-seal type top cap on the square aluminum shell battery of current, in top cap production process, the phenomenon that the PP heat-seal gum can appear excessive when receiving the hot pressing, can lead to the heat-seal layer damaged after the PP overflows, leads to the battery to become invalid, and the PP that on the other hand overflowed glues can form rugged region on the top cap surface, and then influences the welding reliability of top cap.

Disclosure of Invention

An aim of the embodiment of the application is to provide a top cover and a battery, which can solve the problem that the welding reliability of the top cover is influenced due to overflow of PP heat sealing glue in the existing production process of the top cover of the battery.

In a first aspect, embodiments of the present application provide a top cover, the top cover comprising: the pole, the hot-press mounting piece and the cover plate; the pole is connected with the cover plate through the hot-pressing installation piece, an overflow groove is formed in the pole, and the hot-pressing installation piece is at least partially filled in the overflow groove.

Optionally, the pole comprises a flat plate part and a pole part arranged at one side of the flat plate part, and a hot pressing groove for fixing the flat plate part is formed at one side of the hot pressing installation piece, which is away from the cover plate; the overflow groove comprises a first groove, the first groove is arranged on the flat plate part, and the hot pressing installation piece is at least partially filled in the first groove.

Optionally, the height of the hot pressing groove is greater than 2/3 of the depth of the first groove, and the top end of the hot pressing groove is located between two groove walls of the first groove.

Optionally, the top cover further includes an insulating plate, the hot-press mounting piece includes a first hot-press portion and a second hot-press portion, the hot-press groove is disposed on one side of the first hot-press portion, the second hot-press portion is disposed on the other side of the first hot-press portion, and the first hot-press portion is at least partially filled in the first groove;

the cover plate is provided with a first mounting groove for fixing the first hot-pressing part, the insulating plate is arranged on one side of the cover plate, which is away from the flat plate part, the insulating plate is provided with a second mounting groove on one side of the cover plate, which is towards the cover plate, and the cover plate is provided with a second through hole;

the second hot pressing part is abutted with the second mounting groove.

Optionally, the overflow groove further comprises a second groove, and the second groove is arranged on the pole part; the second hot press portion is at least partially filled in the second groove.

Optionally, the second hot pressing portion includes first end and second end, first end with first hot pressing portion connects, the second end is provided with the butt portion, the butt portion is followed radially and keep away from the second hot pressing portion the direction protrusion of second hot pressing portion, the diameter of the cross section of second mounting groove with the difference of the diameter of second through-hole is the target numerical value, the wall thickness of butt portion is greater than 2/3 of target numerical value.

Optionally, the wall thickness of the second hot pressing part is 1mm-5mm.

Optionally, a fourth through hole is further formed in the insulating plate, the second hot pressing portion penetrates through the fourth through hole, the fourth through hole is located on one side, facing the cover plate, of the second mounting groove, the diameter of the cross section of the second mounting groove is 1.4-1.8 times that of the fourth through hole, and the depth of the second mounting groove is 0.3-0.7 times that of the thickness of the insulating plate.

Optionally, the second hot pressing part is provided with a first through hole extending along the axial direction, and the pole part passes through the first through hole; the second hot pressing portion passes through the second through hole.

In a second aspect, embodiments of the present application also provide a battery comprising a top cover according to the first aspect.

In the embodiments of the present application, the hot press mount becomes viscous and has tackiness to bond the post and the cover plate together when subjected to hot pressing, i.e., heating and pressurizing. The overflow groove is formed in the pole, when the hot-pressing installation piece is subjected to hot pressing, the excessive part of the hot-pressing installation piece can enter the overflow groove and is filled in the overflow groove after solidification, so that the uneven condition of the surface of the top cover can be avoided, and the welding reliability of the top cover is ensured.

Drawings

FIG. 1 is an exploded view of a top cover provided in an embodiment of the present application;

FIG. 2 is a top view of an assembled top cover provided in an embodiment of the present application;

FIG. 3 is a cross-sectional view of F-F of FIG. 2;

fig. 4 is a top view of a positive electrode post provided in an embodiment of the present application;

FIG. 5 is a cross-sectional view A-A of FIG. 4;

FIG. 6 is a top view of a positive hot press mount provided in an embodiment of the present application;

FIG. 7 is a cross-sectional view taken at C-C of FIG. 6;

FIG. 8 is a top view of a cover plate provided in an embodiment of the present application;

FIG. 9 is a D-D sectional view of FIG. 8;

fig. 10 is a top view of an insulating plate according to an embodiment of the present disclosure;

FIG. 11 is a sectional E-E view of FIG. 10;

fig. 12 is a schematic structural view of a positive electrode switching piece according to an embodiment of the present disclosure;

fig. 13 is a bottom view of an insulating plate according to an embodiment of the present application.

Reference numerals illustrate:

1. a positive electrode post; 111. a flat plate portion; 112. a pole portion; 113. a ring-shaped structure; 114. a first groove; 1141. an upper groove wall; 1142. a lower groove wall; 115. a second groove; 2. positive electrode hot-pressing installation piece; 21. a hot pressing groove; 211. a top end; 212. a bottom; 22. a second hot press section; 23. a first through hole; 24. a first hot press section; 25. an abutting portion; 3. a cover plate; 31. a positive electrode first mounting groove; 32. a positive electrode second through hole; 33. a liquid injection hole; 34. convex ribs; 35. an explosion-proof mounting groove; 36. a negative electrode first mounting groove; 37. a negative electrode second through hole; 4. an insulating plate; 41. positioning the boss; 42. a positive electrode fourth through hole; 43. a liquid injection avoiding hole; 44. an explosion-proof valve avoiding hole; 45. a negative electrode fourth through hole; 46. a positive electrode third mounting groove; 47. an anti-clogging grille; 48. a negative electrode third mounting groove; 49. a negative electrode second mounting groove; 410. a positive electrode second mounting groove; 5. a positive electrode switching piece; 51. a mounting part; 52. a third through hole; 53. positioning angle; 54. a switching part; 6. an explosion-proof protective film; 7. sealing sheets; 8. sealing nails; 9. explosion-proof sheet; 10. a negative electrode post; 11. a negative electrode hot-press mounting member; 12. a negative electrode switching sheet.

Detailed Description

Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.

The top cap that this application embodiment provided includes: a pole, a hot press mount and a cover plate 3. Wherein, the post is connected with the cover plate 3 through a hot-pressing mounting piece, and an overflow groove is arranged on the post, and the hot-pressing mounting piece is at least partially filled in the overflow groove.

As shown in fig. 1 to 3, the number of the poles and the hot press mounts is 2, and the poles include a positive pole 1 for connecting the positive pole of the battery after the top cover is mounted on the battery and a negative pole 10 for connecting the negative pole of the battery after the top cover is mounted on the battery. The hot-press mounting piece comprises a positive electrode hot-press mounting piece 2 and a negative electrode hot-press mounting piece 11, the positive electrode hot-press mounting piece 2 and the negative electrode hot-press mounting piece 11 are symmetrically mounted on the cover plate 3, the positive electrode column 1 is connected with the cover plate 3 through the positive electrode hot-press mounting piece 2, and the negative electrode column 10 is connected with the cover plate 3 through the negative electrode hot-press mounting piece 11. The positive electrode pole 1 and the negative electrode pole 10 have the same structure, and the positive electrode hot-press mounting piece 2 and the negative electrode hot-press mounting piece 11 have the same structure. In the following description, the structure, principle and assembly process of the top cover of the present embodiment will be described by taking the positive electrode post 1 and the positive electrode hot press mounting member 2 as examples.

The positive electrode hot-pressing installation piece 2 is installed on the cover plate 3, the positive electrode post 1 is installed on the positive electrode hot-pressing installation piece 2, the positive electrode hot-pressing installation piece 2 is made of PP heat-sealing glue, and the melting point of the PP heat-sealing glue needs to be more than 200 ℃. When the positive electrode hot-press mounting member 2 is subjected to hot-press action, i.e., heating and pressurizing, the positive electrode hot-press mounting member 2 becomes viscous and has viscosity due to the material characteristics of the PP heat-seal adhesive, so as to bond the positive electrode post 1 and the cap plate 3 together and solidify after cooling. Because the overflow groove is formed in the pole, when the hot-pressing installation piece is subjected to hot pressing, the overflow part of the hot-pressing installation piece during hot-pressing melting can enter the overflow groove and is filled in the overflow groove after solidification, the situation that the surface of the cover plate is uneven after the overflow solidification of the hot-pressing installation piece can be avoided, and the welding reliability of the top cover is ensured.

Alternatively, the pole includes a flat plate portion 111 and a pole portion 112 disposed on one side of the flat plate portion 111, and a hot pressing groove 21 for fixing the flat plate portion 111 is provided on a side of the hot pressing mount facing away from the cover plate 3. The overflow trough comprises a first groove 114, the first groove 114 is arranged on the flat plate part 111, and the hot press mounting piece is at least partially used for filling in the first groove 114.

The side of the positive electrode hot-pressing installation member 2 facing away from the cover plate 3, i.e., the upper side as shown in fig. 1, is provided with a hot-pressing groove 21. As shown in fig. 4 and 5, the positive electrode post 1 includes a flat plate portion 111 and a post portion 112 disposed at the lower side of the flat plate portion 111, the flat plate portion 111 is square, the post portion 112 is in a columnar structure, and the width of the flat plate portion 111, that is, the length of the flat plate portion 111 in the left-right direction shown in fig. 5 is far greater than the outer diameter of the post portion 112, so that the flat plate portion 111 can be stably fixed in the hot pressing groove 21, the flat plate portion 111 does not shake, and when the positive electrode hot pressing mounting member 2 is subjected to hot pressing to bond the positive electrode post 1 and the cover plate 3, no deviation is generated between the positions of the positive electrode post 1 and the cover plate 3, thereby ensuring the structural stability of the top cap of the embodiment.

Referring to fig. 5 and 7, in the process of assembling the positive electrode post 1 and the positive electrode hot-press mounting member 2, the flat plate portion 111 of the positive electrode post 1 is fixed in the hot-press groove 21 of the positive electrode hot-press mounting member 2, the flat plate portion 111 contacts with the side wall of the hot-press groove 21, the positive electrode hot-press mounting member 2 becomes viscous under the hot-press effect, and the volume of the positive electrode hot-press mounting member 2 is required to be slightly larger than the volume required for bonding in order to ensure the bonding effect, so that the PP heat-seal adhesive can overflow. At this time, the PP heat-seal adhesive belonging to the side wall part of the hot pressing groove 21 is pushed and filled into the first groove 114 by the jig, so that the situation that the surface of the cover plate 3 is uneven after the PP heat-seal adhesive is overflowed and solidified can be avoided, and the welding process of the cover plate 3 cannot be influenced.

Further, the height of the heat pressing groove 21 is greater than 2/3 of the depth of the first groove 114, and the top end of the heat pressing groove 21 is located between two groove walls of the first groove 114.

As shown in fig. 7, the height of the autoclave 21 is the distance between the top 211 and the bottom 212 of the autoclave 21, and the height of the autoclave 21 is H shown in fig. 7. As shown in fig. 5, the depth of the first groove 114 is the length from the bottom of the first groove 114 to the notch of the first groove 114. The walls of the first recess 114 include an upper wall 1141 located above and a lower wall 1142 located below, and the depth of the first recess 114 is L1 shown in fig. 5. Referring to fig. 3, 5 and 7 in combination, in the process of assembling the positive electrode post 1 and the positive electrode hot-press mounting member 2, when the flat plate portion 111 of the positive electrode post 1 is fixed in the hot-press groove 21 of the positive electrode hot-press mounting member 2, the top end of the hot-press groove 21 is located between the upper groove wall 1141 and the lower groove wall 1142 of the first groove 114, and the height H1 of the hot-press groove 21 is greater than 2/3 of the depth L1 of the first groove 114, so that the positive electrode hot-press mounting member 2 has a PP heat-seal adhesive cover plate 3 and the positive electrode hot-press mounting member 2 with sufficient volume, and the PP heat-seal adhesive of the side wall portion of the redundant hot-press groove 21 can be filled in the first groove 114 of the positive electrode post 1. In addition, the top end of the side wall of the hot pressing groove 21 is located between the two groove walls in the upper and lower directions of the first groove 114, so that the excessive PP heat-seal glue can be conveniently filled into the first groove 114 when the PP heat-seal glue overflows, and the top cover of the embodiment is convenient to assemble.

Optionally, the top cover further includes an insulating plate 4, the hot press mounting piece includes a first hot press portion 24 and a second hot press portion 22, the hot press groove 21 is disposed on one side of the first hot press portion 24, the second hot press portion 22 is disposed on the other side of the first hot press portion 24, and the first hot press portion 24 is at least partially filled in the first groove 114. The cover plate 3 is provided with a first mounting groove for fixing the first hot-pressing portion 24, the insulating plate 4 is arranged on one side, far away from the flat plate portion 111, of the cover plate 3, the insulating plate 4 is provided with a second mounting groove on one side, facing the cover plate 3, of the insulating plate 4, and the cover plate 3 is provided with a second through hole. The second heat pressing portion 22 abuts against the second mounting groove.

As shown in fig. 6 and 7, the positive electrode hot press mounting member 2 includes a first hot press portion 24 and a second hot press portion 22, the first hot press portion 24 is provided with a hot press groove 21 for fixing the flat plate portion 111, the second hot press portion 22 is provided on a side of the first hot press portion 24 where the hot press groove 21 is not provided, the second hot press portion 22 is columnar, a through hole is provided along an axial direction of the second hot press portion 22, the through hole penetrates the first hot press portion 24 and communicates with the hot press groove 21, and when the flat plate portion 111 is fixed in the hot press groove 21, the pole portion 112 penetrates the through hole.

It should be noted that, since the cover plate 3 is provided with the first mounting grooves, the number of the hot press mounting pieces in the present embodiment is two, and the hot press mounting pieces include the positive electrode hot press mounting piece 2 and the negative electrode hot press mounting piece 11, respectively, and therefore the first mounting grooves in the cover plate 3 are two, and the positive electrode first mounting groove 31 and the negative electrode first mounting groove 36 are respectively. As shown in fig. 8 and 9, the positive electrode first mounting groove 31 and the negative electrode second mounting groove 49 are respectively opened at both sides of the cover plate 3

As shown in fig. 10 and 11, the insulating plate 4 is provided with two second mounting grooves, namely a positive second mounting groove 410 and a negative second mounting groove 49.

The manner of assembling the positive electrode hot press mounting material 2 and the positive electrode post 1 with the cap plate 3 and the insulating plate 4 will be described below by taking the positive electrode hot press mounting material and the positive electrode post as examples.

After the cap plate 3 is mounted on the insulating plate 4, the first hot-press portion 24 of the positive electrode hot-press mounting member 2 is fixed in the positive electrode first mounting groove 31 of the cap plate 3, and the second hot-press portion 22 extends into the positive electrode second mounting groove 410 of the insulating plate 4 and abuts against the bottom of the positive electrode second mounting groove 410. Referring further to fig. 10 and 11, after the assembly of the positive electrode hot press mounting member 2 is completed, the flat plate portion 111 of the positive electrode tab 1 is fixed in the hot press groove 21 of the first hot press portion 24, and the tab portion 112 of the positive electrode tab 1 passes through the through hole of the second hot press portion 22. When the positive electrode hot-press mounting member 2 is subjected to hot-press, the positive electrode hot-press mounting member 2 melts and becomes viscous and has viscosity, and the PP heat-seal adhesive can fill up the gap between the outer wall of the post portion 112 of the positive electrode post 1 and the cover plate 3 to bond the positive electrode post 1 and the cover plate 3. Through the cooperation of first hot pressing portion 24 and first mounting groove, the cooperation of second hot pressing portion 22 and second mounting groove has reduced the assembly degree of difficulty when assembling between apron 3, insulation board 4, anodal utmost point post 1 and the anodal hot pressing installed part 2 of this embodiment.

Optionally, the overflow groove further includes a second groove 115, and the second groove 115 is disposed on the pole portion 112; the second thermo-compression section 22 at least partially fills the second recess 115.

Referring to fig. 3, fig. 5 and fig. 7, the second groove 115 is formed in the post portion 112, specifically, the second groove 115 is circumferentially disposed around the post portion 112, that is, circumferentially disposed around the outer wall of the post portion 112, when the flat plate portion 111 of the positive electrode post 1 is fixed in the hot pressing groove 21 of the positive electrode hot pressing mounting member 2, the post portion 112 of the positive electrode post 1 passes through the through hole formed in the second hot pressing portion 22, and when the positive electrode hot pressing mounting member 2 is subjected to hot pressing, the PP heat seal can fill the gap between the outer wall of the post portion 112 of the positive electrode post 1 and the inner wall of the positive electrode second through hole 32 on the cover plate 3, and meanwhile, the redundant PP heat seal can be filled into the second groove 115, so that the overflow of the PP heat seal is further prevented, the bonding area of the PP heat seal and the positive electrode post 1 is increased, the bonding effect is enhanced, and the fixing relationship between the cover plate 3 and the positive electrode post 1 is more firm.

Optionally, the second hot-pressing portion 22 includes a first end and a second end, the first end is connected with the first hot-pressing portion, the second end is provided with an abutting portion 25, the abutting portion 25 protrudes from the second hot-pressing portion 22 along a radial direction and a direction away from the second hot-pressing portion 22, a difference between a diameter of a cross section of the second mounting groove and a diameter of the second through hole is a target value, and a wall thickness of the abutting portion 25 is greater than 2/3 of the target value.

Referring to fig. 3, 7 and 11 in combination, the second end of the second hot pressing portion 22, that is, the end of the second hot pressing portion 22 away from the first hot pressing portion 24 forms an abutment portion 25, and the lower end surface of the abutment portion 25 is an abutment surface for abutting against a corresponding second mounting groove. The wall thickness of the abutting portion 25 is L2 shown in fig. 7, the diameter of the second through hole is R1 shown in fig. 9, the diameter of the cross section of the second mounting groove is R2 shown in fig. 11, and the target value is (R2-R1). When the positive electrode hot press mounting member 2 is subjected to hot press melting, the positive electrode second mounting groove 410 can be filled, and the wall thickness L2 of the abutting portion 25 is greater than 2/3 of the target data (R2-R1), so that the filling effect can be ensured. The arrangement of the abutting part 25 not only ensures that the connection relationship between the cover plate 3 and the insulating plate 4 is firmer, prevents the cover plate 3 and the insulating plate 4 from falling off, but also prevents the PP heat-seal adhesive from overflowing. In addition, the PP heat-seal adhesive fills the gaps of the second mounting groove and the fourth through hole, so that the sealing effect is achieved.

Further, the wall thickness of the second hot pressing portion 22 is 1mm-5mm, the wall thickness of the second hot pressing portion 22 is L3 shown in fig. 7, and the L3 is preferably 2-3mm, so that the strength of the second hot pressing portion 22 after the first through hole 23 is formed is ensured, and the structural stability of the top cover in this embodiment is ensured.

Referring to fig. 11, optionally, a fourth through hole is formed in the insulating board 4, the second hot pressing portion 22 passes through the first through hole, the cross section of the second mounting groove is circular, the diameter of the cross section of the second mounting groove is 1.4-1.8 times of the diameter of the fourth through hole, and the depth of the second mounting groove is 0.3-0.7 times of the thickness of the insulating board.

The diameter of the fourth through hole is R3 as shown in FIG. 11, the depth of the second mounting groove is L4 as shown in FIG. 11, and the thickness of the insulating plate is L5 as shown in FIG. 11. The number of the second mounting grooves is 2, namely, the positive electrode second mounting groove 410 and the negative electrode second mounting groove 49, respectively, and the number of the fourth through holes is 2, namely, the positive electrode fourth through hole 42 and the negative electrode fourth through hole 45, respectively. The positive electrode second mounting groove 410 corresponds to the positive electrode fourth through hole 42, and the positive electrode fourth through hole 42 is arranged above the notch of the positive electrode second mounting groove 410. The negative electrode second mounting groove 49 corresponds to the negative electrode fourth through hole 45, and the negative electrode fourth through hole 45 is opened above the notch of the negative electrode second mounting groove 49. The diameter R2 of the cross section of the second mounting groove is 1.4-1.8 times of the diameter R3 of the corresponding fourth through hole, the depth L4 of the second mounting groove is 0.3-0.7 times of the thickness L5 of the insulating plate 4, the diameter R3 of the fourth through hole is larger than the diameter R1 of the second through hole, the parameters of the second mounting groove are in the range and the size relation between the fourth through hole and the second through hole, so that the effect of the second mounting groove for preventing the overflow of the PP heat sealing glue is ensured, and the strength of the insulating plate 4 is not greatly reduced.

Optionally, the second hot pressing portion 22 is provided with a first through hole 23 extending in the axial direction, and the pole portion 112 passes through the first through hole 23; the cover plate 3 is provided with a second through hole, and the second hot pressing part 22 passes through the second through hole.

Referring to fig. 3, 7 and 9, the through hole formed in the second hot-pressing portion 22 is a first through hole 23, the first through hole 23 penetrates through the first hot-pressing portion 24 and the second hot-pressing portion 22, and when the flat plate portion 111 is fixed in the hot-pressing groove 21, the pole portion 112 extends toward the insulating plate 4 through the first through hole 23.

The number of the second through holes is two, namely a positive electrode second through hole 32 and a negative electrode second through hole 37, wherein the positive electrode first mounting groove 31 corresponds to the positive electrode second through hole 32, and the negative electrode first mounting groove 36 corresponds to the negative electrode second through hole 37. The positive electrode second through hole 32 is formed at the bottom of the positive electrode first mounting groove 31 and penetrates the cover plate 3, and the negative electrode second through hole 27 is formed at the bottom of the negative electrode first mounting groove 36 and penetrates the cover plate. When the flat plate portion 111 is fixed in the autoclave 21, the pole portion 112 passes through the first through hole 23 and extends in the insulating plate 4 direction through the second through hole. The arrangement of the first through hole and the second through hole further facilitates the installation of the pole.

Optionally, positioning bosses 41 are disposed on two sides of the insulating plate 4, the positioning bosses 41 protrude in a direction away from the cover plate 3, and a stepped surface is formed between the positioning bosses 41 and the insulating plate 4. The height H of the positioning boss 41 is 3mm-8mm, and the width W of the positioning boss 41 is 8mm-15mm. The positioning bosses 41 on the two sides of the insulating plate 4 are used for preventing the battery body from shaking left and right after being assembled with the battery body. Optionally, the conductive assembly further includes a switching piece, where the switching piece is installed on a side of the insulating board 4 away from the cover board 3, and the switching piece is provided with a third through hole 52; the end of the pole portion 112 remote from the flat plate portion 111 protrudes radially outward to form an annular structure 113, the outer diameter of the annular structure 113 matching the inner diameter of the third through hole 52.

As shown in fig. 1 and 3, the number of the tabs is two, one is a positive electrode tab 5 for mating with the positive electrode post 1 and one is a negative electrode tab for mating with the negative electrode post 10.

The end of the pole part 112 of the positive pole 1 far away from the flat plate part 111, that is, the lower end as shown in fig. 5 forms an annular structure 113, when the flat plate part 111 of the positive pole 1 is embedded into the hot pressing groove 21 of the positive hot pressing mounting member 2, the pole part 112 of the positive pole 1 passes through the first through hole 23 of the positive hot pressing mounting member 2, and referring to fig. 3 and 12 in combination, after the pole part 112 passes through the first through hole 23, the annular structure 113 of the pole part 112 extends into the third through hole 52 of the positive pole rotating tab 5 mounted on the side of the insulating plate 4 far away from the cover plate 3, the inner diameter of the third through hole 52 is matched with the outer diameter of the annular structure 113, and the annular structure 113 and the positive pole rotating tab 5 are welded together through the third through hole 52, so that the assembly of the positive pole rotating tab 5 is realized. In this embodiment, the outer diameter of the annular structure 113 is matched with the inner diameter of the first through hole 23, and as can be understood, a gap is formed between the outer wall of the pole portion 112 of the positive pole 1 and the first through hole 23, and due to the design of the annular structure 113, when the positive hot-press mounting member 2 is hot-pressed and melted, the PP hot-seal adhesive can be blocked at a position above the bottom of the second mounting groove by the annular structure 113, so that the PP hot-seal adhesive is filled in the second through hole, the fourth through hole and the second mounting groove, and the bonding effect of the hot-press mounting member and the sealing effect of the PP hot-seal adhesive after filling are improved.

Optionally, the adapter piece includes installation department 51, adapter portion 54 and connecting portion, and installation department 51 and adapter portion 54 are connected respectively to the both ends of connecting portion, and installation department 51 and adapter portion 54 mutually perpendicular, and installation department 51 are installed on insulation board 4, and third through-hole 52 is seted up in installation department 51, and the one end that the connecting portion was kept away from to installation department 51 is provided with location angle 53, and the third mounting groove has been seted up to one side that insulation board 4 kept away from apron 3, and the profile of third mounting groove matches with the profile of installation department 51.

Referring to fig. 12 and 13 in combination, the insulating plate 4 is provided with two third mounting grooves, namely a positive third mounting groove 46 for mating with the positive switching piece 5 and a negative third mounting groove 48 for mating with the negative switching piece. The contour of the third mounting groove is matched with the contour of the mounting part 51, and the third mounting groove plays a role in positioning and is convenient for mounting the switching piece.

Referring further to fig. 1, in one embodiment, the top cover further comprises an explosion protection film 6, a sealing sheet 7, a sealing nail 8, and an explosion protection sheet 9. Referring to fig. 9, the cover plate 3 is further provided with a liquid injection hole 33 and an explosion-proof mounting groove 35, and the cover plate 3 is further provided with a rib 34, wherein the rib 34 is located at one side of the liquid injection hole 33. Referring to fig. 11 and 13, positioning bosses 41 are further disposed on two sides of the insulating plate 4, and the insulating plate 4 is provided with a liquid injection avoiding hole 43, an explosion-proof valve avoiding hole 44, and an anti-blocking grid 47.

After the top cover is assembled on the battery body, the electrolyte injection hole 33 and the electrolyte injection avoiding hole 43 are used for injecting electrolyte into the battery body, the sealing nail 8 is used for completing the electrolyte injection of the battery, the sealing sheet 7 is used for sealing the sealing nail 8, and the functions of preventing the sealing nail 8 from being punched out and preventing leakage are achieved. The explosion-proof sheet 9 is used for being installed in the explosion-proof installation groove 35 to protect the battery body, and the convex ribs 34 play roles in blocking electrolyte during liquid injection and being used for pasting the explosion-proof protection film 6. The positioning bosses 41 on two sides of the insulating plate 4 are used for preventing the battery body from shaking left and right after being assembled with the battery body, the height H of the positioning bosses 41 is 3mm-8mm, and the width of the positioning bosses 41 is 8mm-15mm. The explosion-proof valve dodging hole 44 is used for the explosion-proof valve of the airflow to the battery body, and the anti-blocking grille 47 is used for preventing the explosion-proof valve from being blocked by foreign matters when the battery fails.

The assembly process of the post, the hot press mounting member, the insulating plate 4 and the cap plate 3 will be fully described below, taking the positive post 1 and the positive hot press mounting member 2 as examples. First, after the explosion-proof sheet 9 is mounted in the explosion-proof mounting groove 35, the cap plate 3 is mounted on the insulating plate 4, and then the first hot-pressed portion 24 of the positive electrode hot-press mounting member 2 is fitted into the positive electrode first mounting groove 31, and the second hot-pressed portion 22 of the positive electrode hot-press mounting member 2 passes through the positive electrode second through hole 32, the positive electrode fourth through hole 42 and abuts against the bottom of the positive electrode second mounting groove 410. Then, the flat plate portion 111 of the positive electrode post 1 is fitted into the hot pressing groove 21 of the positive electrode hot pressing mount 2, and the post portion 112 of the positive electrode post 1 passes through the first through hole 23 of the positive electrode hot pressing mount 2 and protrudes into the positive electrode third mount groove 46. Further, the positive electrode hot press mounting member 2 is subjected to hot press treatment, so that the positive electrode hot press mounting member 2 melts and fills the positive electrode second through hole 32, the positive electrode fourth through hole 42 and the positive electrode second mounting groove 410 to bond the positive electrode post 1 and the cap plate 3 and plays a role in sealing. Thereafter, the mounting portion 51 of the positive electrode tab 5 is mounted into the positive electrode third mounting groove 46, and the annular structure 113 of the post portion 112 of the positive electrode post 1 is welded with the third through hole 52 of the positive electrode tab 5 to complete the mounting of the positive electrode tab 5.

The assembly of each structure of the anode post 10 and the anode hot press mounting member 11 is similar to the above manner, and in order to avoid repetition, description thereof will be omitted.

After the assembly of the post and the hot press mounting member is completed, the explosion-proof protection film 6 is stuck on the bead 34 to complete the assembly of the top cover.

The embodiment of the application also provides a battery, which comprises a battery body and the top cover described in the embodiment above, wherein the top cover is arranged on the battery body. The battery of the embodiment has all the structures of the top cover, so that all the beneficial effects can be achieved, and repetition is not avoided, and the repeated description is omitted.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A top cap, the top cap comprising: the pole, the hot-press mounting piece and the cover plate; the pole is connected with the cover plate through the hot-pressing installation piece, an overflow groove is formed in the pole, and the hot-pressing installation piece is at least partially filled in the overflow groove.

2. The top cover according to claim 1, wherein the pole includes a flat plate portion and a pole portion provided on one side of the flat plate portion, and a hot pressing groove for fixing the flat plate portion is provided on a side of the hot pressing mounting member facing away from the cover plate; the overflow groove comprises a first groove, the first groove is arranged on the flat plate part, and the hot pressing installation piece is at least partially filled in the first groove.

3. The overcap of claim 2, wherein the height of the autoclave is greater than 2/3 of the depth of the first recess, and wherein the apex of the autoclave is located between two walls of the first recess.

4. The top cover of claim 2, further comprising an insulating plate, wherein the heat press mount comprises a first heat press portion and a second heat press portion, wherein the heat press groove is disposed on one side of the first heat press portion, the second heat press portion is disposed on the other side of the first heat press portion, and the first heat press portion is at least partially filled in the first groove;

the cover plate is provided with a first mounting groove for fixing the first hot-pressing part, the insulating plate is arranged on one side of the cover plate, which is away from the flat plate part, the insulating plate is provided with a second mounting groove on one side of the cover plate, which is towards the cover plate, and the cover plate is provided with a second through hole;

the second hot pressing part is abutted with the second mounting groove.

5. The top cover of claim 4, wherein the overflow trough further comprises a second groove disposed in the post portion; the second hot pressing part is at least partially filled in the second groove.

6. The top cover according to claim 4, wherein the second heat pressing portion includes a first end and a second end, the first end is connected with the first heat pressing portion, the second end is provided with an abutting portion, the abutting portion protrudes from the second heat pressing portion in a direction which is radial and away from the second heat pressing portion, a difference between a diameter of a cross section of the second mounting groove and a diameter of the second through hole is a target value, and a wall thickness of the abutting portion is greater than 2/3 of the target value.

7. The overcap of claim 6, wherein the second hot pressed portion has a wall thickness of 1mm to 5mm.

8. The top cover according to claim 4, wherein the insulating plate is further provided with a fourth through hole, the second hot pressing portion penetrates through the fourth through hole, the fourth through hole is located on one side of the second mounting groove facing the cover plate, the diameter of the cross section of the second mounting groove is 1.4-1.8 times of the diameter of the fourth through hole, and the depth of the second mounting groove is 0.3-0.7 times of the thickness of the insulating plate.

9. The top cover according to claim 4, wherein the second heat pressing portion is provided with a first through hole extending in an axial direction, the pole portion passing through the first through hole; the second hot pressing portion passes through the second through hole.

10. A battery, characterized in that it comprises a top cover according to any one of the preceding claims 1 to 9.