CN115995594B - Battery cell cover plate assembly method, battery cell cover plate and battery - Google Patents
Battery cell cover plate assembly method, battery cell cover plate and battery Download PDFInfo
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- CN115995594B CN115995594B CN202211743084.9A CN202211743084A CN115995594B CN 115995594 B CN115995594 B CN 115995594B CN 202211743084 A CN202211743084 A CN 202211743084A CN 115995594 B CN115995594 B CN 115995594B
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000003466 welding Methods 0.000 claims abstract description 12
- 230000006835 compression Effects 0.000 claims description 19
- 238000007906 compression Methods 0.000 claims description 19
- 229920001971 elastomer Polymers 0.000 claims description 16
- 239000000806 elastomer Substances 0.000 claims description 15
- 238000007789 sealing Methods 0.000 description 26
- 238000012797 qualification Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000012545 processing Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000007541 indentation hardness test Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001739 rebound effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- 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
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Abstract
The invention relates to the technical field of batteries, in particular to an assembly method of a battery core cover plate, the battery core cover plate and a battery, wherein the assembly method is used for assembling a cover plate body, a pole and an elastic body to form the battery core cover plate, a terminal hole is formed in the cover plate body, a groove is formed in the pole, and the assembly method comprises the following steps: an elastic body is sleeved on the outer periphery of the pole to form a terminal assembly; fitting the terminal assembly into the terminal bore of the cap plate body, the terminal assembly being an interference fit with the terminal bore; and applying assembly pressure F to the upper surface of the pole, and simultaneously welding the pole and the adapter plate. The assembly method can ensure the overall assembly stability, the whole assembly process is simple and easy to operate, and the pole is not easy to fall off.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to an assembly method of a battery cell cover plate, the battery cell cover plate and a battery.
Background
Currently, as the application field of batteries is wider and wider, the safety of the batteries cannot be ignored. In order to ensure the sealing and insulation between the pole and the cover plate, structures such as an insulating part, a sealing part and the like are added between the pole and the cover plate, and the structures can strictly require the air tightness.
In the related art, the post is formed by processing a substrate having a large thickness, and a convex structure is formed in the middle of the substrate by removing material at the edge of the substrate. During installation, the protruding structure of the pole extends into the pole installation hole, and the end cap of the pole is connected with the cover plate. However, the thickness of the pole is larger, a base material with the thickness of more than 7mm is generally adopted, poor contact with the connecting sheet is easily caused, and meanwhile, the problems of unstable pole fixation and easy falling off can occur in the assembly process.
Disclosure of Invention
Therefore, the invention aims to overcome the defects of complex assembly process and unstable pole fixation of the battery cell cover plate in the prior art, thereby providing an assembly method of the battery cell cover plate, the battery cell cover plate and a battery.
In order to solve the technical problems, the invention provides an assembly method of a battery cell cover plate, which is used for assembling a cover plate body, a pole post and an elastic body to form the battery cell cover plate, wherein a terminal hole is arranged on the cover plate body, a groove is formed in the pole post, and the assembly method comprises the following steps:
an elastic body is sleeved on the outer periphery of the pole to form a terminal assembly;
fitting the terminal assembly into the terminal bore of the cap plate body, the terminal assembly being an interference fit with the terminal bore;
and applying assembly pressure F to the upper surface of the pole, and simultaneously welding the pole and the adapter plate.
Optionally, the applying the assembly pressure F to the upper surface of the pole comprises:
and applying an assembly pressure F of at most 500N & gtm to the upper surface of the pole, wherein the compression amount of the elastomer is a, and a is more than or equal to 40%.
Alternatively, 47% or more and 52% or less of a.
Optionally, an explosion-proof valve is arranged in the groove; optionally, the explosion-proof valve is flush with the lower surface of the pole.
Optionally, the depth of the groove is H1, and H1 is more than or equal to 2mm;
and/or the thickness of the explosion-proof valve is H2, H2 is more than or equal to 0.1mm and less than or equal to 0.2mm;
and/or the thickness of the cover plate body is H3, H3 is more than or equal to 1.5mm and less than or equal to 3mm, and the thickness of the cover plate body is smaller than the depth of the groove;
and/or the inner diameter of the groove is D2, the outer diameter of the pole is D1, and the ratio of D2 to D1 is 1: (1.04-1.2).
Optionally, the hardness of the elastomer is A degrees, and A is more than or equal to 65 and less than or equal to 75.
Optionally, the explosion-proof valve and the pole are integrally formed by stamping;
and/or the pole is non-circular;
and/or, the pole comprises a main body part and a first annular horizontal part positioned at the edge of the top end of the main body part, the elastic body comprises a first annular vertical part which is suitable for being sleeved outside the main body part, a second annular horizontal part which is connected to the top end of the annular vertical part and extends outwards, and a second annular vertical part which is connected to the outer end of the second annular horizontal part and extends vertically upwards, and the first annular horizontal part is suitable for being simultaneously pressed against the second annular horizontal part and the second annular vertical part.
Optionally, the welding position of the adapter piece and the pole is located on the outer periphery side of the explosion-proof valve.
The invention also provides a battery cell cover plate which is assembled and formed based on the assembly method.
The invention also provides a battery, which comprises the battery cell cover plate.
The technical scheme of the invention has the following advantages:
because the groove is formed in the pole, the groove is formed by stamping a plate, the thickness is small, and compared with the pole processed based on the prior art, the pole formed by stamping has less burrs and low material cost; but because of the small thickness, extremely high demands are placed on the assembly process. According to the assembling method, when the electrode post with the specific structure is assembled, the elastic body is sleeved on the outer peripheral side of the electrode post to form the terminal assembly, then the whole terminal assembly is assembled into the terminal hole on the cover plate body from top to bottom, the terminal assembly is in interference fit with the terminal hole, the elastic body is extruded, so that the electrode post is in insulating and sealing connection with the cover plate body, the electrode post can be stably fixed on the cover plate body, then the assembling pressure is applied to the upper surface of the electrode post, meanwhile, the electrode post is welded with the adapter plate, the integral assembling stability can be ensured, the whole assembling process is simple and easy to operate, and the electrode post is not easy to fall off.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is an exploded view of a pole connection structure;
FIG. 2 is a cross-sectional view of a pole connection structure;
FIG. 3 is a schematic diagram of an assembly process of the cell cover plate;
FIG. 4 is an exploded view of the cell cover;
FIG. 5 is a schematic view of a pole structure;
FIG. 6 is a partial cross-sectional view of a cell cover;
fig. 7 is a schematic structural view of a battery;
fig. 8 is a schematic structural view of a battery module.
Reference numerals illustrate:
1. a cover plate body; 100. a terminal hole; 101. a liquid injection hole; 2. a pole; 201. a groove; 202. a main body portion; 203. a first annular horizontal portion; 21. a positive electrode post; 22. a negative electrode post; 3. an elastomer; 301. a first annular vertical portion; 302. a second annular horizontal portion; 303. a second annular vertical portion; 311. a first sealing part; 312. a second sealing part; 4. an explosion-proof valve; 5. a welding position; 8. lower plastic; 801. an overflow hole; 9. a transfer sheet; 91. a positive electrode connecting sheet; 92. a negative electrode connecting sheet; 10. and a connecting sheet.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; 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 invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
The embodiment provides a pole connection structure which is applied to a square shell battery.
In one embodiment, as shown in fig. 1 and 2, the pole connection structure includes a cap body 1, a pole 2, an adapter, and an elastic body 3. Wherein the cap body 1 is provided with a terminal hole 100; the first side of the pole 2 is recessed towards the second side thereof to form a protruding structure on the second side of the pole 2, and a groove 201 is formed on the first side of the pole 2, wherein the first side and the second side are opposite sides of the pole 2; the protruding structure passes through the terminal hole 100, and the top end of the protruding structure is connected with the adapter piece 9; the elastic body 3 is sealed between the pole 2 and the cover plate body 1.
Wherein the groove 201 is punched from a sheet material.
In addition to the above embodiments, in a preferred embodiment, the pole 2 has a stamped integral structure. Because the pole 2 is of a stamping integrated structure, a thinner plate can be adopted as a processing raw material, so that the thickness of the pole 2 is small, and the pole is usually prepared by adopting a milling or die casting process in the prior art, burrs are generated on the connecting side of the adapter, so that the pole burrs formed by stamping are less and the material cost is low compared with the pole processed based on the prior art.
In a preferred embodiment, the outer surface of the raised structures is smooth.
On the basis of the above embodiment, in a preferred embodiment, the elastic body 3 includes the first sealing portion 311, the first sealing portion 311 is provided with a through hole through which the protrusion structure passes, and the first sealing portion 311 is pressed between the end of the pole 2 and the cap plate body 1.
On the basis of the above embodiment, in a preferred embodiment, the elastic body 3 further includes a second sealing portion 312, the second sealing portion 312 protrudes from the first sealing portion 311, and the second sealing portion 312 is provided with a through hole through which the protruding structure passes, the second sealing portion 312 being pressed between the protruding structure and the side wall of the terminal hole 100.
Specifically, in one embodiment, the pole 2 includes a main body 202 and a first annular horizontal portion 203 located at the top edge of the main body 202, the first sealing portion 311 includes a second annular horizontal portion 302 and a second annular vertical portion 303, the second sealing portion 312 includes a first annular vertical portion 301, the first annular vertical portion 301 is sleeved outside the main body 202, the second annular horizontal portion 302 is connected to the top end of the annular vertical portion and extends outwards, and the second annular vertical portion 303 is connected to the outer end of the second annular horizontal portion 302 and extends vertically upwards. In this embodiment, when assembling the pole 2 and the elastic body 3, the pole 2 may be mounted in the elastic body 3 from top to bottom, or the elastic body 3 may be mounted outside the pole 2 from bottom to top, after the assembly, the first annular vertical portion 301 is sleeved outside the main body 202, the second annular vertical portion 303 is sleeved on the outer periphery of the first annular horizontal portion 203, the first annular horizontal portion 203 abuts against the second annular horizontal portion 302, the sealing effect of the elastic body 3 on the pole 2 is good, the two are not easy to separate, and after the terminal assembly formed by assembling the pole 2 and the elastic body 3 is assembled on the terminal hole 100 on the cover plate body 1, the second annular horizontal portion 302 of the elastic body 3 abuts against the upper surface of the cover plate body 1, the first annular vertical portion 301 of the elastic body 3 abuts against the hole wall of the terminal hole 100, so that the sealing insulation effect can be ensured, and meanwhile, the terminal assembly is not easy to fall off from the terminal hole 100, and the overall stability is ensured.
On the basis of the above embodiment, in a preferred embodiment, both the first seal portion 311 and the second seal portion 312 have compression set.
On the basis of the above embodiment, in a preferred embodiment, the top end of the protruding structure is provided as a planar structure, and the planar structure is attached to and connected with the adapter piece 9.
On the basis of the above embodiment, in a preferred embodiment, the tips of the protruding structures are welded to the adapter piece 9.
On the basis of the above embodiment, in a preferred embodiment, the thickness of the material at each position of the pole 2 is 0.5mm-4.5mm;
alternatively, the thickness of the material at each location of the pole 2 is 0.5mm to 3.5mm, and more preferably 2mm to 3.5mm.
Example 2
Since the thickness of the pole 2 in the above embodiment is small, a high requirement is set for the assembly process, and for this purpose, this embodiment provides an assembly method of the battery cell cover plate, which is used for assembling the cover plate body 1, the pole 2 and the elastic body 3 in the above embodiment to form the battery cell cover plate.
In one embodiment, as shown in fig. 3, the assembly method includes the steps of:
s1, sleeving an elastic body 3 on the outer periphery side of a pole 2 to form a terminal assembly;
s2, assembling a terminal assembly into the terminal hole 100 of the cover plate body 1, wherein the terminal assembly is in interference fit with the terminal hole 100;
s3, applying assembly pressure F to the upper surface of the pole 2, and simultaneously welding the pole 2 and the adapter piece 9.
In this embodiment, when assembling, first, the elastomer 3 is sleeved on the outer periphery of the pole 2 to form a terminal assembly, then the whole terminal assembly is assembled into the terminal hole 100 on the cover plate body 1 from top to bottom, the terminal assembly is in interference fit with the terminal hole 100, the elastomer 3 is extruded, so that the pole 2 is in insulating and sealing connection with the cover plate body 1, the pole 2 can be stably fixed on the cover plate body 1, then the assembling pressure is applied to the upper surface of the pole 2, meanwhile, the pole 2 is welded with the adapting piece 9, the whole assembling stability can be ensured, the whole assembling process is simple and easy to operate, and the pole 2 is not easy to fall off.
In a preferred embodiment, applying the assembly pressure F to the upper surface of the pole 2 in step S3 includes: an assembly pressure F of at most 500 N.about.m is applied to the upper surface of the pole 2, and the compression of the elastomer 3 is a, a being not less than 40%. Specifically, when the compression amount of the elastic body 3 is too small, the sealability is poor, and when the compression amount is too large, the service life of the elastic body 3 is reduced, and due to the limit of the pole structure, local deformation may be caused, so that the assembly pressure is controlled to be not more than 500n·m, the compression amount is not too large, and the compression amount is controlled to be more than 40%, so that the sealability can be ensured.
Example 3
The basic content of this embodiment is the same as embodiment 2, in that: the groove 201 is connected with an explosion-proof valve 4.
In one embodiment, the assembly method comprises the steps of:
s1, sleeving an elastic body 3 on the outer periphery side of a pole 2 to form a terminal assembly;
s2, assembling a terminal assembly into the terminal hole 100 of the cover plate body 1, wherein the terminal assembly is in interference fit with the terminal hole 100;
s3, applying assembly pressure F to the upper surface of the pole 2, and simultaneously welding the pole 2 and the adapter piece 9.
In this embodiment, since the recess 201 is formed in the pole 2, and the explosion-proof valve 4 is connected in the recess 201, that is, the explosion-proof valve 4 is connected in the pole 2, there is no need to process the mounting hole of the explosion-proof valve 4 on the cover plate body 1, so that the processing procedure of the cover plate body 1 can be reduced, and the cost can be saved. When assembling, establish elastomer 3 at utmost point post 2 periphery side cover earlier, form the terminal subassembly, afterwards assemble the terminal hole 100 on the apron body 1 with whole terminal subassembly from top to bottom, terminal subassembly and terminal hole 100 interference fit, elastomer 3 receives the extrusion, thereby make utmost point post 2 and apron body 1 insulating sealing connection, utmost point post 2 can be fixed on apron body 1 steadily, afterwards apply the assembly pressure to the upper surface of utmost point post 2, make utmost point post 2 and changeover piece 9 welding simultaneously, can ensure holistic assembly stability, whole assembly process is simple easy to operate, utmost point post 2 is difficult for droing.
In a preferred embodiment, applying the assembly pressure F to the upper surface of the pole 2 in step S3 includes: an assembly pressure F of 150-160N m is applied to the upper surface of the pole 2, and the compression amount of the elastomer 3 is a, and a is more than or equal to 40%. Specifically, when the compression amount of the elastic body 3 is too small, the sealability is poor, and when the compression amount is too large, the service life of the elastic body 3 is reduced, so that the assembly pressure is controlled to be 150-160n·m, the compression amount is not too large, and the compression amount is controlled to be more than 40%, so that the sealability can be ensured. And when the assembly pressure exceeds 160N, m or the compression amount of the elastomer 3 is too small, spot check finds that the explosion test of part of the explosion-proof valve does not reach the standard.
| Sequence number | Compression amount | Hardness of | Yield of percent of pass |
| 1 | 40％ | 65 | 100％ |
| 2 | 42％ | 75 | 100％ |
| 3 | 45％ | 70 | 100％ |
| 4 | 47％ | 70 | 100％ |
| 5 | 50％ | 70 | 100％ |
| 6 | 52％ | 65 | 100％ |
| 7 | 55％ | 70 | 100％ |
| 8 | 60％ | 65 | 100％ |
| 9 | 62％ | 65 | 100％ |
| D1 | 25％ | 70 | 96％ |
| D2 | 35％ | 70 | 96％ |
TABLE 1
Referring to table 1, according to the air tightness test, when the compression amount of the elastic body 3 is 40% or more, the air tightness qualification rate is 100%.
In this embodiment, since the pole 2 is fixed by welding with the adapter piece 9, the elastic body 3 needs to have a large compression amount, and the sealing performance is ensured by using the rebound effect of the elastic body 3, and the pole 2 is prevented from falling off.
Based on the above embodiment, in a preferred embodiment, 47% or more and 52% or less of a is used. In this embodiment, by controlling the compression amount of the elastic body 3 to be between 47% and 52%, both the sealing property and the service life of the elastic body 3 can be ensured.
Based on the above embodiment, in a preferred embodiment, the hardness of the elastomer 3 is A.ltoreq.A.ltoreq.75. In combination with Table 1 above, the qualification rate of the air tightness test was ensured when the hardness of the elastomer 3 was between 65 degrees and 75 degrees according to the GBT531-1999 rubber pocket durometer indentation hardness test method. Particularly when the hardness of the elastic body 3 is between 65 degrees and 75 degrees, and the compression amount of the elastic body 3 is 40% or more and 62% or less, the qualification rate of the air tightness test is 100%.
On the basis of the above embodiment, in a preferred embodiment, the explosion-proof valve 4 is flush with the lower surface of the pole 2. In this embodiment, since the explosion-proof valve 4 is flush with the lower surface of the pole 2, the explosion-proof valve 4 is closer to the inside of the battery, and meanwhile, articles are not easy to touch the explosion-proof valve 4 outside the battery, so that the performance is safer and more stable. Because the explosion-proof valve 4 is parallel and level with the lower surface of the pole 2, after the explosion-proof valve 4 is installed in place, the lower surface of the whole pole 2 is a flat plane, no cushion block is required to be additionally arranged, and meanwhile, the problem that the periphery of the explosion-proof valve can be cracked during punching is also avoided. Specifically, during stamping, the groove 201 is stamped on the pole 2, and then the explosion-proof valve 4 is stamped, so that the groove is stamped. The rear part of the bottom of the groove is thinner, so that the explosion-proof valve 4 can be conveniently stamped, otherwise, the requirement on the stamping process is higher. Of course, in an alternative embodiment, the explosion-proof valve 4 may be located at the middle height position of the groove 201 or near the top, and the stamping difficulty is slightly higher than that of the stamping to be flush with the lower surface of the pole 2 due to the need of performing the upper and lower secondary stamping, and the explosion-proof valve 4 prepared after the secondary stamping has the condition that the detection test does not reach the standard.
Based on the above embodiment, in a preferred embodiment, the depth of the groove 201 is H1, H1. Gtoreq.2 mm. In this embodiment, the depth of the recess 201 is at least 2mm, which ensures that the explosion-proof valve 4 can be mounted inside the pole 2 on the one hand and that the explosion-proof valve 4 is as close as possible to the inside of the battery on the other hand. The depth of the groove 201 is required to be enough to allow the lower surface of the pole 2 to be welded to the adaptor 9.
In a preferred embodiment, 2.2 mm.ltoreq.H2.ltoreq.4mm.
Based on the above embodiment, in a preferred embodiment, the explosion-proof valve 4 has a thickness H2 of 0.1 mm.ltoreq.H2.ltoreq.0.2 mm. In this embodiment, the thickness of the explosion-proof valve 4 is small, when the internal pressure of the battery is high, the imprint on the explosion-proof valve 4 will break, and the explosion-proof valve 4 with the thickness is matched with the pole column 2 with the thickness of 2mm-3.5mm, and the comprehensive qualification rate of the finished product (mainly including the qualification rate of the assembled finished product, the qualification rate of the sealing performance of the battery cell cover plate, the qualification rate of the stamping finished product and the detection qualification rate of the explosion-proof valve) is optimal.
As shown in fig. 5, the imprint on the explosion-proof valve 4 is Y-shaped. In other alternative embodiments, the imprint on the explosion-proof valve 4 may have other shapes, and the shape of the imprint on the explosion-proof valve 4 is not limited in this embodiment.
On the basis of the above embodiment, in a preferred embodiment, the thickness of the cover plate body 1 is H3, H3 is 1.5 mm.ltoreq.H2.ltoreq.3 mm, and the thickness of the cover plate body 1 is smaller than the depth of the groove 201. In this embodiment, the thickness of the cover body 1 is smaller than the depth of the groove 201, i.e. the height of the pole 2 is larger than the thickness of the cover body 1, so that the top end of the pole 2 protrudes from the upper surface of the cover body 1.
Based on the above embodiment, in a preferred embodiment, the inner diameter of the groove 201 is D2, the outer diameter of the pole 2 is D1, and the ratio of D2 to D1 is 1: (1.04-1.2). In this embodiment, the wall of the groove 201 is spaced from the outer wall of the pole 2, so that it is ensured that machining the groove 201 in the pole 2 does not affect the strength of the pole 2.
In addition to the above embodiments, in a preferred embodiment, the explosion-proof valve 4 is integrally press-molded with the pole 2. In this embodiment, the explosion-proof valve 4 and the pole 2 are punched into an integral structure, and during assembly, the processing procedure of welding the cover plate body 1 and the explosion-proof valve 4 is reduced, so that the manufacturing cost can be reduced, the utilization rate of the pole 2 is improved, the assembly procedure is reduced, and the overall reliability is improved.
As shown in fig. 3 and 6, the recess 201 includes a bottom wall, the middle of which has a through hole penetrating the post 2, and the explosion-proof valve 4 is integrally punched on the bottom wall and closes the top end of the through hole. When the height of the through hole is low and the thickness of the explosion-proof valve 4 is not very thin, the explosion-proof valve 4 is embedded in the through hole after punching.
In a preferred embodiment, the pole 2 is non-circular, based on the above embodiments. In this embodiment, the pole 2 is non-circular, and the pole 2 is prevented from rotating. Of course, when the pole 2 is non-circular, the shape of the terminal hole 100 is correspondingly set to be non-circular.
In particular, the pole 2 may be a pentagonal prism or a hexagonal prism.
On the basis of the above embodiment, in a preferred embodiment, the pole 2 includes the main body 202 and the first annular horizontal portion 203 located at the top edge of the main body 202, the elastic body 3 includes the first annular vertical portion 301 adapted to be sleeved outside the main body 202, the second annular horizontal portion 302 connected to the top end of the annular vertical portion and extending outwards, and the second annular vertical portion 303 connected to the outer end of the second annular horizontal portion 302 and extending vertically upwards, and the first annular horizontal portion 203 is adapted to be simultaneously pressed against the second annular horizontal portion 302 and the second annular vertical portion 303. In this embodiment, when assembling the pole 2 and the elastic body 3, the pole 2 may be mounted in the elastic body 3 from top to bottom, or the elastic body 3 may be mounted outside the pole 2 from bottom to top, after the assembly, the first annular vertical portion 301 is sleeved outside the main body 202, the second annular vertical portion 303 is sleeved on the outer periphery of the first annular horizontal portion 203, the first annular horizontal portion 203 abuts against the second annular horizontal portion 302, the sealing effect of the elastic body 3 on the pole 2 is good, the two are not easy to separate, and after the terminal assembly formed by assembling the pole 2 and the elastic body 3 is assembled on the terminal hole 100 on the cover plate body 1, the second annular horizontal portion 302 of the elastic body 3 abuts against the upper surface of the cover plate body 1, the first annular vertical portion 301 of the elastic body 3 abuts against the hole wall of the terminal hole 100, so that the sealing insulation effect can be ensured, and meanwhile, the terminal assembly is not easy to fall off from the terminal hole 100, and the overall stability is ensured. The second annular horizontal portion 302 and the second annular vertical portion 303 in the present embodiment constitute the first sealing portion in the above-described embodiment, and the first annular vertical portion 301 constitutes the second sealing portion in the above-described embodiment.
In an alternative embodiment, the elastic body 3 may include only a first annular vertical portion 301 sleeved outside the main body 202, and a second annular horizontal portion 302 connected to the top end of the annular vertical portion and extending outward.
In addition to the above embodiments, in a preferred embodiment, the welding position 5 of the adapter piece 9 and the pole piece 2 is located on the outer peripheral side of the explosion-proof valve 4. In this embodiment, since the welding position 5 of the switching piece 9 and the pole 2 is located on the outer peripheral side of the explosion-proof valve 4, the position is the maximum thickness position of the pole 2, and the switching piece 9 and the pole 2 do not affect the explosion-proof valve 4 when being welded.
Example 3
The present embodiment provides a battery cell cover plate, as shown in fig. 4 to 6, which is assembled based on the assembly method in the above embodiment.
Because the battery cell cover plate is formed based on the assembly method, the cover plate body 1 of the battery cell cover plate does not need to be provided with an explosion-proof valve 4 mounting hole, so that the processing procedure of the cover plate body 1 can be reduced, the cost is saved, the overall assembly stability of the battery cell cover plate can be ensured, and the pole 2 is not easy to fall off.
The cell cover has all the structural features related to the above embodiment, and the description of this embodiment will not be repeated.
The electrode post 2 in the above embodiment may be the positive electrode post 21 or the negative electrode post 22.
In one embodiment, the structures of the positive electrode post 21 and the negative electrode post 22 are identical, grooves 201 are formed in the positive electrode post 21 and the negative electrode post 22, an explosion-proof valve 4 is connected in the grooves 201, and an elastomer 3 is sleeved outside the grooves. Referring to fig. 2, the cover body 1 is further provided with a liquid injection hole 101 for injecting electrolyte, the battery cell cover further comprises a lower plastic 8, the lower plastic 8 is provided with a flow through hole 801 communicated with the liquid injection hole 101, and the adapter piece 9 comprises a positive electrode connecting piece 91 electrically connected with the positive electrode post 21 and a negative electrode connecting piece 92 electrically connected with the negative electrode post 22.
Example 4
The present embodiment provides a battery including the cell cover provided in embodiment 3 above.
The battery may be one battery as shown in fig. 7, or may be a battery module as shown in fig. 8.
As shown in fig. 8, two adjacent cells are connected by a connecting piece 10, and the connecting piece 10 is connected to the positive electrode post 21 of one cell and to the negative electrode post 22 of the adjacent cell.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (13)
1. The assembling method of the battery cell cover plate is characterized by being used for assembling a cover plate body (1), a pole column (2) and an elastic body (3) to form the battery cell cover plate, wherein a terminal hole (100) is formed in the cover plate body (1), and the first side of the pole column (2) is recessed towards the second side of the pole column to form a protruding structure on the second side of the pole column (2); wherein the first side and the second side are two opposite sides of the pole (2); the protruding structure penetrates through the terminal hole (100), the top end of the protruding structure is connected with the adapter piece (9), and a groove (201) is formed in the pole (2); an explosion-proof valve (4) is arranged in the groove (201), and the thickness of the explosion-proof valve (4) is H2, H2 is more than or equal to 0.1mm and less than or equal to 0.2mm; the assembly method comprises the following steps:
an elastic body (3) is sleeved on the outer periphery of the pole (2) to form a terminal assembly;
-fitting the terminal assembly into the terminal hole (100) of the cap plate body (1), the terminal assembly being an interference fit with the terminal hole (100);
and applying an assembly pressure F of 150-160N & ltM & gt to the upper surface of the pole (2), enabling the compression amount of the elastomer (3) to be a, wherein a is more than or equal to 40%, and simultaneously enabling the pole (2) to be welded with the adapter piece (9).
2. The method of assembly of claim 1, wherein 47% or less a or less 52%.
3. The assembly method according to any one of claims 1-2, characterized in that the explosion-proof valve (4) is flush with the lower surface of the pole (2).
4. A method of assembling according to claim 3, wherein the depth of the groove (201) is H1, H1 being ≡2mm.
5. A method of assembling according to claim 3, wherein the cover body (1) has a thickness H3,1.5mm < H3 < 3mm, the cover body (1) having a thickness less than the depth of the recess (201).
6. A method of assembling according to claim 3, wherein the inside diameter of the recess (201) is D2, the outside diameter of the post (2) is D1, and the ratio of D2 to D1 is 1: (1.04-1.2).
7. The method of assembly according to any one of claims 1-2, wherein the elastomer (3) has a hardness of a degrees, 65-a-75.
8. The assembly method according to any one of claims 1-2, characterized in that the explosion-proof valve (4) is integrally stamped with the pole (2).
9. The assembly method according to any one of claims 1-2, characterized in that the pole (2) is non-circular.
10. The assembly method according to any one of claims 1-2, wherein the pole (2) comprises a main body part (202) and a first annular horizontal part (203) located at the top end edge of the main body part (202), the elastic body (3) comprises a first annular vertical part (301) which is suitable for being sleeved outside the main body part (202), a second annular horizontal part (302) which is connected at the top end of the annular vertical part and extends outwards, and a second annular vertical part (303) which is connected at the outer end of the second annular horizontal part (302) and extends vertically upwards, and the first annular horizontal part (203) is suitable for being simultaneously pressed against the second annular horizontal part (302) and the second annular vertical part (303).
11. The assembly method according to any one of claims 1-2, characterized in that the welding location (5) of the adapter piece (9) to the pole piece (2) is located on the outer circumferential side of the explosion-proof valve (4).
12. A cell cover plate, characterized in that it is assembled based on the assembly method according to any one of claims 1-11.
13. A battery comprising the cell cover of claim 12.
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| CN202211743084.9A CN115995594B (en) | 2022-12-28 | 2022-12-28 | Battery cell cover plate assembly method, battery cell cover plate and battery |
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| CN202211743084.9A CN115995594B (en) | 2022-12-28 | 2022-12-28 | Battery cell cover plate assembly method, battery cell cover plate and battery |
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| CN115995594B true CN115995594B (en) | 2024-03-12 |
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| CN115995594A (en) | 2023-04-21 |
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