CN220774551U - Top cover assembly and battery - Google Patents
Top cover assembly and battery Download PDFInfo
- Publication number
- CN220774551U CN220774551U CN202322501340.XU CN202322501340U CN220774551U CN 220774551 U CN220774551 U CN 220774551U CN 202322501340 U CN202322501340 U CN 202322501340U CN 220774551 U CN220774551 U CN 220774551U
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- liquid injection
- hole
- top cover
- pole
- assembly
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- 239000007788 liquid Substances 0.000 claims abstract description 162
- 238000002347 injection Methods 0.000 claims abstract description 151
- 239000007924 injection Substances 0.000 claims abstract description 151
- 229920003023 plastic Polymers 0.000 claims abstract description 106
- 239000004033 plastic Substances 0.000 claims abstract description 106
- 239000000565 sealant Substances 0.000 claims abstract description 47
- 238000007789 sealing Methods 0.000 claims abstract description 33
- 239000003292 glue Substances 0.000 claims abstract description 20
- 230000000149 penetrating effect Effects 0.000 claims abstract description 10
- 210000004027 cell Anatomy 0.000 description 31
- 239000003792 electrolyte Substances 0.000 description 10
- 210000005056 cell body Anatomy 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Filling, Topping-Up Batteries (AREA)
Abstract
The present utility model relates to a top cap assembly and a battery, wherein the top cap assembly includes: a top sheet having a first surface and a second surface in a thickness direction thereof; the top cover plate is provided with a penetrating liquid injection hole and a first pole mounting hole; the first pole assembly is arranged at the first pole mounting hole, and the first pole assembly and the top cover sheet are connected in an insulating and sealing manner through the first insulating assembly; the first insulating assembly comprises a first plastic part; the first plastic piece is attached to the second surface of the top cover plate; the first plastic part comprises a liquid injection part with a liquid containing cavity, the wall of the liquid containing cavity is provided with a first liquid injection through hole and at least one second liquid injection through hole, and the first liquid injection through hole is opposite to the liquid injection hole; the first liquid injection through hole and the at least one second liquid injection through hole are communicated with the liquid injection hole through the liquid containing cavity; sealing glue nails block the liquid injection holes; one end of the sealant nail penetrating through the liquid injection hole is opposite to the first liquid injection through hole. The utility model solves the problem that the lower plastic side is deformed and knocked against the battery cell caused by high-pressure driving of the sealant nails.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a top cover assembly and a battery.
Background
The battery top cover assembly generally mainly comprises a top cover plate body, an explosion-proof valve, a pole column, lower plastic (also known as plastic parts), pins and part of connecting parts, wherein the explosion-proof valve, the pole column, the lower plastic (also known as plastic parts) and the pins are arranged on the top cover plate body. The design of the lower plastic in the secondary batteries of different types is quite different, and the lower plastic generally plays roles of insulation, electrode lug protection, sealing, supporting protection and the like in the batteries according to different requirements.
In addition, since many top cap liquid injection hole design positions are biased to one side of the top cap body in the length direction, corresponding liquid injection holes are formed in corresponding lower plastics for smoothly injecting electrolyte into the battery cells, but in the earlier design, in order to prevent the sealant nails from falling into the battery cells and smoothly injecting electrolyte, a structure with a plurality of liquid injection through holes distributed in a ring shape is designed in the lower plastics below the liquid injection holes, and the liquid injection through holes are not overlapped with the liquid injection holes.
In actual production, after the liquid injection, the liquid injection hole is required to be plugged by a sealant nail, and because the sealant nail is driven into the liquid injection hole by high-pressure gas, the condition that the bottom of the sealant nail is propped against the bottom of the lower plastic can cause the deformation of one side of the lower plastic close to the liquid injection hole and the downward tilting of the separation between the lower plastic and the top cover, thereby colliding with an internal battery cell in a battery, and causing certain potential safety hazard.
Disclosure of Invention
Therefore, the utility model aims to solve the technical problem that the plastic part is deformed to collide with the battery cell due to the fact that the plastic part is driven into the plastic nail under high pressure in the prior art, and provides the top cover assembly and the battery.
The technical scheme adopted by the utility model is as follows:
a header assembly, comprising:
a top cover sheet having a first surface and a second surface in a thickness direction thereof; the top cover sheet is provided with a liquid injection hole and a first pole mounting hole which penetrate through the first surface and the second surface;
the first pole assembly is arranged at the first pole mounting hole, and the first pole assembly and the top cover sheet are connected in an insulating and sealing manner through a first insulating assembly;
the first insulating assembly comprises a first plastic part; the first plastic part is attached to the second surface of the top cover sheet; the first plastic part comprises a liquid injection part with a liquid containing cavity, a first liquid injection through hole and at least one second liquid injection through hole are formed in the cavity wall of the liquid containing cavity, and the first liquid injection through hole is opposite to the liquid injection hole; the first liquid injection through hole and the at least one second liquid injection through hole are communicated with the liquid injection hole through the liquid containing cavity;
the sealant nails block the liquid injection holes; one end of the sealant nail penetrating through the liquid injection hole is opposite to the first liquid injection through hole.
In one embodiment of the present utility model, the diameter of the first liquid injection through hole satisfies the following relationship:
1/2d 2 ≤d＜d 2 ＝d 1 ；
wherein: d is the size of the first liquid injection through hole, d 1 D is the diameter of the liquid injection hole 2 Is the diameter of the largest part of the sealant nail.
In one embodiment of the utility model, the diameter d of the liquid injection hole 1 Is 2mm-6mm.
In one embodiment of the utility model, the part of the sealant nail extending out of the liquid injection hole has a length L 2 The following relationship is satisfied:
L 3 ＜L 2 ≤L 5
wherein: l (L) 3 Is the distance between the first surface of the first plastic part and the second surface of the top cover sheet，L 5 Is the shortest distance between the second surface of the top cover sheet and the cell.
In one embodiment of the present utility model, the thickness of the top cover sheet is 1.5mm±0.05mm, the length of the sealant nail is 5mm±0.05mm, the distance between the edge of the first liquid injection through hole near one end of the top cover sheet and the second surface of the top cover sheet is 3mm±0.05mm, and the thickness of the first plastic member is 0.5mm±0.05mm.
In one embodiment of the present utility model, the first liquid injection through hole and the liquid injection hole are coaxially disposed.
In one embodiment of the present utility model, the first plastic part further includes a containing portion having a first containing groove, and the containing portion is fixedly connected with the liquid injection portion; the first pole assembly comprises a first pin, the first pin comprises a first pole connecting portion used for being connected with a first pole, and the first pole connecting portion is accommodated in the first accommodating groove.
In an embodiment of the utility model, the first insulating component further includes a second plastic part, the second plastic part covers a side facing the battery core in the first pole connection part, and the second plastic part is fixedly connected with the accommodating part.
In one embodiment of the utility model, the top cover sheet is provided with a second post mounting hole penetrating the first surface and the second surface; the second pole assembly is arranged at the second pole mounting hole and is connected with the top cover sheet in an insulating and sealing manner through a second insulating assembly.
In one embodiment of the present utility model, the second insulating component includes a third plastic part, the third plastic part has a second accommodating groove, the second post component includes a second pin, the second pin includes a second post connecting portion for connecting with a second post, and the second post connecting portion is accommodated in the second accommodating groove.
The present utility model also provides a battery comprising: such as the header assembly described above.
Compared with the prior art, the technical scheme of the utility model has at least the following advantages:
according to the top cover assembly, the liquid injection part of the first plastic part is provided with the first liquid injection through hole which is opposite to the liquid injection hole, and due to the existence of the first liquid injection through hole, when the tail end of the sealing glue nail driven into the liquid injection hole is required to be pressed on the first plastic part due to overlong sealing glue nail, the tail end of the sealing glue nail can pass through the first liquid injection through hole, so that the first plastic part is ensured not to deform, and the problem that the tail end of the sealing glue nail causes deformation of lower plastic when the sealing glue nail is driven into the liquid injection hole under high pressure in the prior art is solved.
According to the top cover assembly, the liquid filling part of the first plastic part is provided with the liquid containing cavity, the liquid containing cavity is provided with the first liquid filling through hole and at least one second liquid filling through hole, the purpose of dispersing electrolyte to the periphery is achieved by utilizing the liquid containing cavity, the first liquid filling through hole and the second liquid filling through hole, and the infiltration efficiency of the electrolyte is improved.
Drawings
In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings.
Fig. 1 is a schematic view of a structure of a cap assembly in the present utility model.
Fig. 2 is an exploded view of the top cap assembly of the present utility model from a first perspective.
Fig. 3 is an exploded view of the top cap assembly according to the present utility model from a second perspective.
FIG. 4 is a schematic view of a first plastic part according to the present utility model.
FIG. 5 is a schematic diagram illustrating the assembly of a second plastic part and a connecting part according to the present utility model.
Fig. 6 is a schematic structural diagram of a second plastic part according to the present utility model.
FIG. 7 is a partial schematic view of a sealant nail blocking a liquid injection hole in the present utility model.
Fig. 8 is a schematic view of the structure of a battery in the present utility model.
Fig. 9 is an exploded view of a battery in the present utility model.
Fig. 10 is a partial schematic view of the liquid injection part in the present utility model.
Description of the specification reference numerals: 1. a top cover sheet; 11. a liquid injection hole; 2. a first plastic part; 21. a first liquid injection through hole; 22. a second liquid injection through hole; 23. a first accommodation groove; 231. a convex step; 232. a protrusion; 3. the second plastic piece; 31. a concave portion; 4. a first pole; 5. a first pin; 51. a first pole connection; 52. a first tab connection portion; 53. a notch; 511. a concave step; 6. a battery cell; 61. a cell body; 611. a first tab; 612. a second lug; 7. a post through hole; 8. an explosion-proof valve; 9. and (5) sealing glue nails.
Detailed Description
The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the utility model and practice it.
The foregoing and other features, aspects and advantages of the present utility model will become more apparent from the following detailed description of the embodiments, read in conjunction with the accompanying drawings. The directional terms mentioned in the following embodiments are, for example: upper, lower, left, right, front or rear, etc., are merely references to the directions of the drawings. Thus, directional terminology is used for the purpose of illustration and is not intended to be limiting of the utility model, and furthermore, like reference numerals refer to like elements throughout the embodiments.
Example 1
Referring to fig. 1-4 and 7, a top cap assembly includes:
a top sheet 1, the top sheet 1 having a first surface and a second surface in a thickness direction thereof; the top cover sheet 1 is provided with a liquid injection hole 11 penetrating through the first surface and the second surface and a first pole mounting hole;
the first pole assembly is arranged at the first pole mounting hole, and the first pole assembly and the top cover plate 1 are connected in an insulating and sealing manner through the first insulating assembly;
the first insulation component comprises a first plastic part 2, and the first plastic part 2 is attached to the second surface of the top cover sheet 1; the first plastic part 2 comprises a liquid injection part with a liquid containing cavity, the liquid injection part is provided with a first liquid injection through hole 21 and at least one second liquid injection through hole 22, and the first liquid injection through hole 21 is opposite to the liquid injection hole 11; a first liquid injection through hole 21 and at least a second liquid injection through hole 22 are communicated with the liquid injection hole 11 through the liquid containing cavity;
the sealant nails 9, the sealant nails 9 seal the liquid injection holes 11; one end of the sealant nail 9 penetrating through the liquid injection hole 11 is opposite to the first liquid injection through hole 21.
The top cover assembly provided by the embodiment improves the problem that the deformed lower plastic collides with the battery cell due to the fact that the tail end of the sealing glue nail 9 deforms when the sealing glue nail 9 is driven at high pressure, further reduces the possibility that the inside of the battery cell is damaged, the positive and negative poles are short-circuited, and the damage point lithium precipitation causes safety risk, and improves the yield of battery cell production.
In this embodiment, in order to improve the energy density of the battery, the space reserved in the battery is very small, especially between the battery core and the top cover assembly, so once the top cover assembly deforms the lower plastic arranged opposite to the battery core, the deformed lower plastic scratches the bare battery core diaphragm to damage the pole piece, thereby causing lithium precipitation, affecting the safety performance of the battery core and even being scrapped.
Therefore in order to avoid the problem, the liquid injection part of the first plastic part 2 is provided with the first liquid injection through hole 21 which is opposite to the liquid injection hole 11, the first liquid injection through hole 21 can enable the tail end of the high-pressure driven sealing glue nail 9 to pass through the first liquid injection through hole 21, so that the problem that the tail end of the sealing glue nail 9 causes lower plastic deformation when the sealing glue nail 9 is driven at high pressure to seal the liquid injection hole 11 is solved, and then the problem that the existing deformed lower plastic is separated from the top cover sheet to collide with the inside of the battery cell is solved.
In addition, when the electrolyte is injected from the injection hole 11 of the top cover sheet 1, the electrolyte firstly enters the liquid containing cavity, and then flows into the shell of the battery from the first injection through hole 21 and the second injection through hole 22 respectively, so that the electrolyte is dispersed to the periphery, and the infiltration efficiency of the electrolyte is improved.
In the present embodiment, referring to fig. 10, the diameter of the first liquid injection through hole 21 satisfies the following relation:
1/2d 2 ≤d≤d 2 ＝d 1 ；
wherein: d is the size of the first filling through hole 21, d 1 D is the diameter of the liquid injection hole 11 2 Is the diameter of the largest part of the sealing gum 9.
Specifically, the size of the first liquid injection through hole 21 is 0.75mm-4.90mm, the diameter of the liquid injection hole 11 is 2mm-6mm, and the maximum diameter of the sealant nail 9 is 2mm-6mm. The above dimensional parameters are designed for conventional batteries, but are not limited to the recited values, and other non-recited values within the range of values are equally applicable. The size of the first liquid injection through hole 21 is designed to be smaller than or equal to the diameter of the liquid injection hole 11, and the size of the first liquid injection through hole 21 is designed to be smaller than or equal to the diameter of the largest part of the sealant nail 9, so that the sealant nail 9 is ensured not to fall into the battery core 6; the size of the first injection through hole 21 is larger than or equal to 1/2 of the diameter of the largest part of the sealing glue nail 9, so that when the end of the sealing glue nail 9 is pressed against the first plastic part 2 due to overlong sealing glue nail 9, the end of the sealing glue nail 9 can pass through the first injection through hole 21, wherein it is required to be clear that the maximum diameter of the part, which needs to pass through the first injection through hole 21, of the sealing glue nail 9 is smaller than or equal to the diameter of the first injection through hole 21, and further the first plastic part 2 is ensured not to be deformed by the sealing glue nail 21.
It should be noted that, the sealant nail 9 is in a shape of a truncated cone, and the diameter of the sealant nail 9 is reduced from the top cover sheet 1 to the first plastic member 2, so that in order to avoid the sealant nail 9 falling into the housing from the first liquid injection through hole 21, the aperture of the first liquid injection through hole 21 is designed to be smaller than the diameter of the largest part of the sealant nail 9.
In this embodiment, referring to fig. 10, the distance between the first surface of the first plastic part 2 and the second surface of the top cover sheet 1 satisfies the following relationship:
L 3 ＜L 2
L 3 +L 4 ≤L 2 -L 1
wherein: l (L) 1 For the thickness L of the top cover sheet 1 2 Is a sealing glue nailLength of 9, L 3 Is the distance L between the first surface of the first plastic part 2 and the second surface of the top cover sheet 1 4 Is the thickness of the liquid injection part.
Specifically, the thickness of the top sheet 1 is 1.5mm±0.05mm, the length of the sealant nail 9 is 5mm±0.05mm, the distance between the first surface of the first plastic member 2 and the second surface of the top sheet 1 is 3mm±0.05mm, and the thickness of the first plastic member 2 is 0.5mm±0.05mm. Similarly, the above-mentioned dimension parameters are designed for a conventional battery, but are not limited to the listed values, and other values not listed in the range of values are equally applicable, so long as the end of the sealant nail 9 will abut against the first plastic member 2 when the sealant nail 9 is driven into the liquid injection hole 11 under high pressure, and the first plastic member 2 will deform.
It should be noted that the sealant nail 9 should not be too long, i.e. the end of the sealant nail 9 cannot be pressed against the battery cell 6 after passing through the first injection hole 21, i.e. the part of the sealant nail 9 extending out of the injection hole 11 has a length L 2 The following relationship is satisfied:
L 3 ＜L 2 ≤L 5
wherein: l (L) 3 L5 is the shortest distance between the second surface of the top cover sheet 1 and the cell 6, which is the distance between the first surface of the first plastic part 2 and the second surface of the top cover sheet 1.
It should be noted that, for the cell with the winding corner, the surface of the cell facing the top cover sheet is an arc surface, and the shortest distance between the second surface of the top cover sheet 1 and the cell 6 refers to the shortest distance between the second surface of the top cover sheet 1 and the arc surface of the cell 6; for the stacked cell, the surface of the cell facing the top cover sheet is a plane, and the shortest distance between the second surface of the top cover sheet 1 and the cell 6 refers to the distance between the second surface of the top cover sheet 1 and the cambered surface of the cell 6.
Preferably, the first injection through hole 21 and the injection hole 11 are coaxially disposed to ensure that the distal end of the sealant nail 9 can pass through the first injection through hole 21 more smoothly.
Wherein the shape of the first liquid injection through hole 21 is one of a circle, an ellipse, a sector and a polygon; the shape of the second filling through hole 22 is one or more of a circle, an ellipse, a fan shape, and a polygon. Preferably, the shape of the first liquid injection through hole 21 is the same as the shape of the second liquid injection through hole 22.
In some embodiments, referring to fig. 1 to 7, the first plastic part 2 further includes a receiving portion having a first receiving groove 23, the first insulation component further includes a second plastic part 3, the first pole component includes a first pin 5, the first pin 5 includes a first pole connection portion 51 for connecting with the first pole 4, and the first pole connection portion 51 is embedded in the first receiving groove 23 of the first plastic part 2.
As can be seen from the above, the second plastic member 3 can surround the first pole connecting portion 51, such that the first pole connecting portion 51 is spaced apart from the top cover 1. Avoid top cap piece 1 and first utmost point post connecting portion 51 electricity to be connected, avoid taking place the battery short circuit, simultaneously, in order to prevent that the up end of electric core 6 from being close to the one side of first utmost point post connecting portion 51 and first utmost point post connecting portion 51 contact or take place to scratch, with the second plastic part of first utmost point post connecting portion 51 holding at the second plastic part, separate up end and first utmost point post connecting portion 51 of electric core 6.
Continuing, the first pin 5 further includes a first tab connection portion 52 connected to the first tab connection portion 51 and extending in a direction away from the top cover 1, and the connection portion of the first tab 4 passes through the fifth plastic member, the tab through hole 7 disposed on the first plastic member 2, and the tab through hole 7 disposed on the first tab connection portion 51 and then is fixedly connected to the first tab connection portion 51.
As the first tab connection part 52 extends along the direction away from the top cover 1, for the structure of the tabs at the two sides of the battery cell 6, the first tab 611 and the second tab 612 respectively extend along the two ends of the length direction X of the battery cell 6, and the first tab connection part 52 is welded with any one of the first tab 611 and the second tab 612; the first pole connection portion 51 and the first tab connection portion 52 may be integrally formed, so that the processing difficulty can be reduced and the structural strength can be improved.
Further, the first insulating component further includes a second plastic part 3, the second plastic part 3 covers a side facing the battery core in the first pole connection portion 51, and the second plastic part 3 is fixedly connected with the accommodating portion.
From the above, since the second plastic part 3 is fixedly connected with the accommodating part, the whole first pole connecting part is covered by the plastic part, so that the first pole connecting part 51 is completely separated from the battery cell, and meanwhile, the second plastic part 3 can be abutted against the battery cell 6, so that the battery cell 6 can be prevented from shaking, and the safety of the battery can be improved.
Specifically, referring to fig. 3 and 6, the second plastic part 3 is an integrally formed structure, and includes a cover plate and an annular side plate fixedly connected with the cover plate, the side plate and the cover plate enclose a containing space for containing the pole connection portion, the first pole connection portion 51 is contained in the containing space, and the side plate is in plug-in fit with the first containing groove 23. Wherein, the cover plate is provided with a through hole corresponding to the position of the pole through hole 7 so as to avoid affecting the fixation of the first pole 4 and the first pole connecting portion 51.
In order to ensure the connection between the second plastic member 3 and the first plastic member 1, the first pole connection portion 51 is provided with a concave step 511, and the inside of the first accommodation groove 23 is provided with a boss step 231 matching the concave step 511; the first pole connecting part 51 is provided with a notch 53, and a protrusion 232 which is in plug-in fit with the notch 53 is arranged in the first accommodating groove 23; and the second plastic part 3 is provided with a concave part 31 which is arranged corresponding to the notch 53 and is in plug-in fit with the protrusion 232.
It should be noted that, since the first tab 611 and the second tab 612 led out from the battery cell 6 along the length direction X of the battery cell 6, the top cover 1 is provided with a second post mounting hole penetrating the first surface and the second surface; the second pole mounting hole is provided with a second pole assembly, and the second pole assembly is connected with the top cover sheet 1 in an insulating and sealing manner through a second insulating assembly. The second pole component and the first pole component are designed to have the same structure for convenient manufacture and assembly, and correspondingly, the second insulating component and the first insulating component are approximately identical in structure, specifically:
the second insulation component comprises a third plastic part, the third plastic part is only provided with a second accommodating groove, the second pole component comprises a second pin, the second pin comprises a second pole connecting part used for being connected with the second pole, and the second pole connecting part is accommodated in the second accommodating groove.
The second pin further comprises a second lug connection part which is connected with the second post connection part and extends along the direction far away from the top cover piece 1, and the connection part of the second post passes through the sixth plastic part, the third plastic part and the second post connection part and then is fixedly connected with the second post connection part.
The second insulating component further comprises a fourth plastic part, the fourth plastic part covers one side, facing the battery cell 6, of the second pole connecting part, the fourth plastic part is fixedly connected with the third plastic part, and the connecting structure of the second pole connecting part, the fourth plastic part and the third plastic part is consistent with the connecting structure of the first pole connecting part, the second plastic part 3 and the first plastic part 2, so that the connecting structure of the second pole connecting part, the fourth plastic part and the third plastic part is not repeated.
It should be noted that, the first plastic part 2, the second plastic part 3, the fourth plastic part and the third plastic may be fixedly connected by a clamping manner, or may be fixedly connected by an ultrasonic welding manner.
In some embodiments, since a large amount of chemical substances such as electrolyte is contained in the battery, a large amount of mixed gas and liquid are generated during charging and discharging, and pressure is accumulated continuously, an explosion-proof valve 8 is arranged on the top cover sheet 1 in order to prevent explosion caused by excessive pressure in the battery.
Referring to fig. 7 and 8, a battery of the present embodiment includes:
the shell body is provided with a plurality of grooves,
the battery cell 6 is arranged in the shell; specifically, the battery cell 6 includes a battery cell body 61, and a first tab 611 and a second tab 612 extending from two ends of the battery cell body 61 along a length direction X;
as the top cover assembly is provided, the lug connection part is fixedly connected with the lug.
The battery cell comprises a positive plate, a diaphragm and a negative plate, which can be sequentially stacked and wound, wherein the positive plate comprises a positive current collector and a positive active material coated on the surface of the positive current collector, and the negative plate comprises a negative current collector and a negative active material coated on the surface of the negative current collector. The first tab 611 is connected to the positive current collector, the second tab 612 is connected to the negative current collector, the edge of the positive current collector may have a blank area uncovered by the positive active material, and the first tab 611 may be directly formed by cutting the blank area at one end of the cell body 61 in the length direction X. Similarly, the second tab 612 may directly pass through the blank area of the negative current collector at the other end of the length direction X of the cut cell body 61, and in addition, the first tab 611 and the second tab 612 may be fixed to the blank areas of the positive electrode sheet and the negative electrode sheet respectively by welding. The first tab 611 may be connected to the positive electrode tab, and the second tab 612 may be connected to the negative electrode tab by laser welding.
Example two
The first difference from the embodiment is the number of second filling holes 22.
Specifically, the liquid injection part is further provided with a plurality of second liquid injection through holes 22 which are arranged on the liquid injection part in a matrix manner, the number of the liquid injection through holes is further increased, and a liquid injection channel is formed, so that electrolyte can enter the battery through the first liquid injection through holes 21 conveniently.
The plurality of second liquid injection through holes 22 may be arranged according to a certain rule, for example, as shown in fig. 4, five second liquid injection through holes 22 are annularly arranged with the first liquid injection through hole 21 as a center, and three second liquid injection through holes 22 are arranged in the liquid injection part according to a matrix of 1×3 to form a liquid injection channel, so that formation nails or foreign matters falling from the liquid injection holes 11 can be intercepted, and meanwhile, the liquid injection efficiency is ensured.
Example III
Based on the first embodiment, the shape of the first liquid injection through hole 21 is circular, and if the size of the liquid injection hole 11 is 3mm, the maximum diameter of the sealant nail 9 is also 3mm for good sealing, the diameter of the first liquid injection through hole 21 is set to 1.50mm-2.90mm;
or,
the shape of the first liquid injection through hole 21 is circular, if the liquid hole size is 5mm, and the maximum diameter of the sealant nail 9 is 5mm for good sealing, the diameter of the first liquid injection through hole 21 is set to be 2.50mm-4.90mm;
or,
the shape of the first liquid injection through hole 21 is regular hexagon, if the size of the liquid injection hole 11 is 3mm, the maximum diameter of the sealant nail 9 is 3mm for good sealing, and the vertical distance from the center to the edge of the first liquid injection through hole 21 is set to be 0.75mm-1.45mm;
example IV
Based on the first embodiment, the shape of the first liquid injection through hole 21 is circular, if the overall height of the sealant nail 9 is 5mm, the thickness of the top cover sheet 1 is 1.5mm, when the top surfaces of the top cover sheet 1 and the sealant nail 9 are level, that is, the sealant nail 9 is in a normal insertion state, at this time, the height of the part of the sealant nail 9 exposing the top cover sheet is 3.5mm, and the thickness of the first plastic member 2 is 0.5mm, so that the distance between the edge of one end of the first liquid injection through hole 21, which is close to the top cover sheet 1, and the second surface of the top cover sheet 1 is 3mm, and the tip of the sealant nail 9 is just located at the first liquid injection through hole 21.
Or,
the shape of the first injecting hole 21 is circular, if the overall height of the sealant nail 9 is 5mm, the thickness of the top cover sheet 1 is 1.5mm, when the upper surface of the sealant nail 9 is lower than the first surface 1mm of the top cover sheet 1, namely, the sealant nail 9 is in an excessively inserted state, the height of the sealant nail 9 exposing the top cover sheet 1 is 4.5mm, the thickness of the first plastic member 2 is 0.5mm, the distance between the edge of the first injecting hole 21, close to one end of the top cover sheet 1, and the second surface of the top cover sheet 1 is 3mm, the height of the tip of the sealant nail 9 just exposing the first injecting hole 21 is 1mm, the bottom of the sealant nail 9 cannot prop against the bottom of the first plastic member 2 to deform, and further safety risks are caused.
In the third and fourth embodiments, the shape and size of the second liquid injection through hole 22 are not limited as long as the second liquid injection through hole 22 and the first liquid injection through hole 21 communicate with the liquid injection hole 11 through the liquid containing chamber and can function to intercept the formation nail or foreign matter dropped from the liquid injection hole 11.
In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present utility model will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.
Claims (10)
1. A header assembly, comprising:
a top cover sheet (1), the top cover sheet (1) having a first surface and a second surface in a thickness direction thereof; the top cover sheet (1) is provided with a liquid injection hole (11) penetrating through the first surface and the second surface and a first pole mounting hole;
the first pole assembly is arranged at the first pole mounting hole, and the first pole assembly and the top cover sheet (1) are connected in an insulating and sealing manner through a first insulating assembly;
wherein the first insulating assembly comprises a first plastic part (2); the first plastic part (2) is attached to the second surface of the top cover sheet (1); the first plastic part (2) comprises a liquid injection part with a liquid containing cavity, a first liquid injection through hole (21) and at least one second liquid injection through hole (22) are arranged on the cavity wall of the liquid containing cavity, and the first liquid injection through hole (21) is opposite to the liquid injection hole (11); the first liquid injection through hole (21) and the at least one second liquid injection through hole (22) are communicated with the liquid injection hole (11) through the liquid containing cavity;
the sealant nails (9) are used for sealing the liquid injection holes (11); one end of the sealant nail (9) penetrating through the liquid injection hole (11) is opposite to the first liquid injection through hole (21).
2. The cap assembly according to claim 1, wherein the diameter of the first liquid injection through hole (21) satisfies the following relation:
1/2d 2 ≤d＜d 2 ＝d 1 ；
wherein: d is the size of the first liquid injection through hole (21), d 1 Is the diameter of the liquid injection hole (11), d 2 Is the diameter of the largest part of the sealing glue nail (9).
3. The cap assembly according to claim 2, wherein the diameter d of the liquid injection hole (11) 1 Is 2mm-6mm.
4. The cap assembly according to claim 1, wherein a portion of the sealant nail (9) extending beyond the liquid injection hole (11) has a length L 2 The following relationship is satisfied:
L 3 ＜L 2 ≤L 5
wherein: l (L) 3 L5 is the shortest distance between the second surface of the top cover piece (1) and the battery cell (6), and is the distance between the first surface of the first plastic piece (2) and the second surface of the top cover piece (1).
5. The top cover assembly according to claim 4, wherein the thickness of the top cover sheet (1) is 1.5mm plus or minus 0.05mm, the length of the sealant nail (9) is 5mm plus or minus 0.05mm, the distance between the first liquid injection through hole (21) near one end edge of the top cover sheet (1) and the second surface of the top cover sheet (1) is 3mm plus or minus 0.05mm, and the thickness of the first plastic member (2) is 0.5mm plus or minus 0.05mm.
6. The cap assembly according to any one of claims 1 to 5, wherein the first liquid injection through hole (21) and the liquid injection hole (11) are coaxially disposed.
7. The top cover assembly according to any one of claims 1 to 5, wherein the first plastic part (2) further comprises a receiving portion having a first receiving groove (23), the receiving portion being fixedly connected to the liquid injection portion; the first pole assembly comprises a first pin (5), the first pin (5) comprises a first pole connecting part (51) used for being connected with the first pole (4), and the first pole connecting part (51) is accommodated in the first accommodating groove (23).
8. The top cover assembly according to claim 7, wherein the first insulating assembly further comprises a second plastic member (3), the second plastic member (3) covers a side of the first pole connection portion (51) facing the battery cell, and the second plastic member (3) is fixedly connected with the accommodating portion.
9. The roof assembly according to claim 7, wherein the roof sheet (1) is provided with a second pole mounting hole penetrating the first surface and the second surface; the second pole assembly is arranged at the second pole mounting hole and is connected with the top cover sheet (1) in an insulating and sealing manner through a second insulating assembly.
10. A battery, comprising: the cap assembly of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322501340.XU CN220774551U (en) | 2023-09-14 | 2023-09-14 | Top cover assembly and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322501340.XU CN220774551U (en) | 2023-09-14 | 2023-09-14 | Top cover assembly and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220774551U true CN220774551U (en) | 2024-04-12 |
Family
ID=90603151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322501340.XU Active CN220774551U (en) | 2023-09-14 | 2023-09-14 | Top cover assembly and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220774551U (en) |
-
2023
- 2023-09-14 CN CN202322501340.XU patent/CN220774551U/en active Active
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| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No. 68, Xin'anjiang Road, Southeast Street, Changshu City, Suzhou City, Jiangsu Province, 215000 Patentee after: Jiangsu Zhengli New Energy Battery Technology Co.,Ltd. Country or region after: China Address before: No. 68, Xin'anjiang Road, Southeast Street, Changshu City, Suzhou City, Jiangsu Province, 215000 Patentee before: Jiangsu Zenergy Battery Technologies Co.,ltd Country or region before: China |
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