CN210576046U

CN210576046U - Sealing element for lithium ion battery capacitor

Info

Publication number: CN210576046U
Application number: CN201921293842.5U
Authority: CN
Inventors: 王银洲
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-12
Filing date: 2019-08-12
Publication date: 2020-05-19
Anticipated expiration: 2029-08-12

Abstract

The utility model discloses a sealing member for lithium ion battery capacitor, including clamping ring, insulating seal, apron, pure aluminium T head, the first interior taper concave surface of T, concave point, clamping ring and the first welding ring of T that sets gradually, annotate liquid hole chamfer, apron concave surface step, the sealed muscle of the first annular of T, anodal utmost point ear. The pressure ring is provided with a secondary step center hole and is formed by punching; the method comprises the steps of inserting an integrated injection molding cover plate with an insulating sealing body into the small end of a T-head pole, enabling an outer flange of the cover plate to be in the same direction with the small end face of a pure aluminum T-head pole, then installing a pressing ring into a combined piece with the T-head of the injection molding cover plate, attaching a small hole base surface of a step of the pressing ring to the insulating sealing body, then riveting and pressing to form the integrated injection molding cover plate, then pressing a concave point at the center of the small end face of the T-head pole, driving a material at the small end of the T-head to move to the periphery of a large hole of the step at the center of the pressing ring to enable the T-head to form an I.

Description

Sealing element for lithium ion battery capacitor

Technical Field

The utility model relates to a secondary battery power technical field, concretely relates to sealing member for lithium ion battery capacitor.

Background

As a high-pulse energy storage device, a lithium ion battery capacitor gradually becomes the mainstream of the battery energy market due to its high power density, fast charge and discharge, and long service life, and is widely applied to Automatic Meter Reading (AMR) devices, GPS/GSM/ARGOS related systems, automobile devices, remote sensors, radio frequency identification systems, emergency equipment, military fields, and the like. With the development of society, people put higher demands on the performance of lithium ion battery capacitors, especially on the reliability and safety of the lithium ion battery capacitors. The battery tightness is an important link influencing the reliability and safety of the battery, and is a technical difficulty and a key point in the battery production process.

At present, the lithium ion battery capacitor is usually sealed by using glass or ceramic to seal a post and a cover plate made of metal materials, and the sealing component of the disclosed battery capacitor is characterized in that glass is used for sealing and insulating between a negative electrode cover plate and a positive electrode post. The inventor finds that the sealing mode has the following defects in the practical application process through long-term research: in the process of welding the pole and the lug of the battery capacitor, glass or ceramic is easy to crack or break due to external force, which causes the occurrence of a sealing gap, so that electrolyte leaks from the pole end under the action of internal pressure, thereby reducing the service life of the battery capacitor; secondly, the hardness of the glass and the ceramic is higher, when the battery capacitor is vibrated, the glass and the ceramic are easy to damage and even fall off to cause the failure of the battery capacitor; in addition, because the pole and the cover plate are made of metal materials, and the metal is sealed by glass or ceramic sealant, the adopted sintering process equipment has high manufacturing cost, complex process and high manufacturing cost, and impurities are easy to generate to pollute the battery capacitor.

In addition, most of cylindrical lithium ion batteries and battery capacitors in the current market adopt a semi-sealing structure or a cross-shaped positive electrode aluminum pole, a compression ring, an injection molding cover plate and a full-sealing structure sealing assembly formed by riveting and pressing a positive electrode lug and a lug aluminum compression ring, the lug is riveted by adopting manual production, the manufacturing process is complicated, the automatic production is inconvenient to adopt, and the production efficiency is low; meanwhile, through long-term research and tests, the inventor discovers that after vehicle-mounted vibration, the battery has high internal resistance, discrete discharge curve and poor cell performance consistency, and can not meet the requirement on sealing performance in the fields of vehicle-mounted systems, intelligent gas meters, intelligent water meters and the like (the gas leakage rate is less than 1.0 multiplied by 10 < -8 > Pa.m 3/s (He)), so that the sealing element with the full sealing structure is invented.

Disclosure of Invention

In view of the problem that exists among the background art, the utility model aims to provide a sealing member for lithium ion battery capacitor, it can satisfy the requirement of battery security, reliability, stability, can satisfy the block again and make the biggest difficult point leakproofness requirement, has optimized the preparation technology simultaneously, is convenient for adopt a large amount of automated production, makes cost reduction, and economic benefits improves.

In order to achieve the above object, the utility model provides a sealing element for lithium ion battery capacitor, which comprises a compression ring, an insulating sealing body, a cover plate, a pure aluminum T head, a T head inner taper concave surface, a concave point, a compression ring and T head welding ring, a liquid injection hole chamfer, a cover plate step flat and a T head annular sealing rib which are arranged in sequence; the method is characterized in that the step center hole of the pressing ring is punched and formed; the insulating sealing body is made of high-low temperature resistant and corrosion resistant fluoroplastic and is integrally formed with the cover plate embedded part, so that the working procedure of the sealing assembly is simplified; the cover plate is provided with a central hole, the back of the convex edge of the cover plate of the central hole is provided with a step plane which is formed by punching and molding and is integrated with the insulating sealing body by injection molding, and the cover plate is also provided with a liquid injection hole, and the liquid injection hole is provided with a chamfer angle which plays a role of guiding the sealing nail at the plane end of the cover plate; the pure aluminum T-shaped head is formed by head beating and extrusion of a wire, the manufacturing process is simple, the cost is low, the base surface of the T-shaped head pole column is a conical concave surface 5, and the T-shaped head pole column and the annular rib 10 form a sealing structure. The method comprises the steps of inserting an integrated injection molding cover plate with an insulating sealing body into the small end of a T-head pole, enabling an outer flange of the cover plate to be in the same direction with the small end face of a pure aluminum T-head pole, then installing a pressing ring into a combined piece of the injection molding cover plate and the T-head, attaching a small hole base surface of a step of the pressing ring to the insulating sealing body and then riveting the base surface, then pressing a concave point at the center of the small end face of the T-head pole, driving a material at the small end of the T-head to move to the periphery of a large hole of the step at the center of the pressing ring to enable the T-. The battery cell aluminum lug and the T-head large end face 23 are welded by automatic laser, so that the welding is firm and high in efficiency.

Furthermore, in order to effectively prevent the leakage or the increase of internal resistance of the battery capacitor caused by sealing failure due to the looseness of the pressure ring in the long-term use process or the vibration environment, the charging and discharging curve is discrete; after the cap is assembled and riveted, circumferential seam welding or circumferential equal-division local welding is adopted for the connecting part of the pressure ring and the periphery of the T-shaped head pole column, so that the connecting reliability of the T-shaped head and the pressure ring is ensured, the contact internal resistance is reduced, and the charging and discharging platform of the battery capacitor is improved.

Furthermore, in order to ensure the firmness of the cap assembling and riveting, after the assembling and riveting are finished, a conical concave point is punched at the center of the end face of the T-head pole, the T-head pole material is driven to move towards the periphery of the stepped hole of the pressing ring, and the riveting strength of the cap pressing ring and the T head is improved.

Furthermore, the T head is a pure aluminum wire which is extruded and formed by heading, the manufacturing process is simple, and the cost is low; the small end face of the T-head polar column is provided with a round angle instead of a sharp corner, so that in the process of assembling with the injection molding cover plate, the short circuit of a cover cap and a battery caused by the fact that the sharp corner of the small end face of the T-head polar column breaks an insulating sealing body of a central hole of the injection molding cover plate is avoided, the insulating resistance is improved, and the safety performance of the battery is improved; the inner end face of the T head is an inwards concave conical surface, the inwards concave conical surface is provided with an annular rib for preventing the insulating sealing body from moving outwards, in the cap assembling and riveting process, the inwards concave conical surface and the annular rib on the surface can dually and effectively prevent the insulating sealing body from moving outwards in the radial direction, and the insulating sealing body is extruded by the external force of the inwards concave conical surface of the T head and the inwards concave conical surface of the pressing ring, so that the insulating sealing body is compacted to ensure the safety and reliability of the cap.

Further, in order to solve the problems that after the T head and the positive electrode lug of the conventional battery cell in the market are riveted, the internal resistance of the battery cell is increased after long-term use or under a vibration environment, the charging and discharging curves are discrete, meanwhile, an automatic process is inconvenient to adopt, and the manual production efficiency is low, the inventor adopts the T head and the positive electrode lug made of pure aluminum materials, the large end plane of the T head and the aluminum electrode lug of the battery cell are welded by laser, the welding of the same material is firm, the process is simple, the automatic production is convenient to adopt, and the efficiency is high and low.

Furthermore, in order to ensure reliable sealing performance, the cover plate is provided with a central hole, the central hole is provided with a step plane which is subjected to punch forming on the back surface of the convex edge of the cover plate, or the two surfaces of the cover plate or any one surface of the cover plate is provided with the step plane which is subjected to punch forming, the cover plate with the structure and the insulating sealing body form an integrated injection molding cover plate after the embedded part is subjected to injection molding, the assembly process of the cover cap and the equipment asset investment are simplified, and the production efficiency is improved; further, the sealing performance of the cap is guaranteed in multiple ways.

Furthermore, in order to ensure the reliability of the sealing of the liquid injection hole of the cover plate, the liquid injection hole is provided with a chamfer, the process of pressing the sealing nail after the liquid injection of the battery capacitor is finished can effectively play a role in guiding the sealing nail, the phenomenon that the sealing nail is not vertical or is not concentric with the liquid injection hole in the process of pressing the sealing nail is prevented, the inner wall of the liquid injection hole is scratched, the leakage of the liquid injection hole of the cover cap is caused, and the sealing performance is improved.

Furthermore, in order to ensure reliable sealing performance and simplify the assembly process, the injection molding cover plate is provided with a central hole which is matched with the cover plate and is formed into a whole by injection molding, the insulating sealing body is made of high-low temperature resistant, corrosion resistant and soft-hardness fluoroplastic, and the step plane of the cover plate is filled up by injection molding. In the process of assembling and riveting the cover plate, the insulating sealing body is simultaneously extruded by the inner end face of the T head and two faces of the pressing ring, the insulating sealing body is prevented from flowing radially under the action of the step plane of the cover plate and the inner end face of the T head, the insulating sealing body is stressed and compacted only in the thickness direction of the plane material, and the sealing performance of the cover cap is improved.

Furthermore, in order to ensure the connection strength and the sealing reliability of the riveted cap, the pressing ring is made of stainless steel materials, a step center hole is formed through punch forming, the step depth is 40% -60% of the material thickness, enough material occupying space is reserved after T-head riveting, the riveting strength is ensured, a small hole base surface of the center hole is an inwards concave conical surface, in the process of assembling and riveting the cap, the insulating sealing body is prevented from moving outwards in the radial direction, the insulating sealing body is pressed only in the plane material thickness direction, and the sealing performance is improved in a limited space range.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

(1) the utility model discloses T head post welds as an organic wholely after sealed cap clamping ring and riveting, has improved the sealing performance of sealing member, has reduced the internal resistance, has improved charge-discharge performance.

(2) The new T head end face of the utility model adopts the structure of the concave conical surface and the annular rib, prevents the electrolyte from leaking, and further improves the sealing performance of the compaction of the stress of the sealing body.

(3) The utility model discloses the osculum base face of clamping ring step centre bore adopts indent conical surface structure, and stamping forming, has improved sealing performance, has reduced manufacturing cost.

(4) The end face of the T-shaped head pole column is provided with the arc angle, so that the insulating sealant is effectively prevented from being damaged by shoveling and breaking in the process of loading the injection molding cover plate, and the pressing safety is improved.

(5) The electrode lug and the T are both made of pure aluminum and have good toughness, the electrode lug and the end surface of the T head are welded by laser, the process is simple and firm, the internal resistance is reduced, the performance and the efficiency are improved, and the cost is reduced.

The beneficial effects of the utility model are that, simplified the manufacturing process of sealed block, reduced the block internal resistance, improved the charge-discharge performance, ensured the requirement of lithium ion battery sealing member security, reliability, stability.

Drawings

Fig. 1 is a schematic structural diagram of the sealing member of the present invention.

Fig. 2 is a schematic view of the cover plate structure of the present invention.

Fig. 3 is a schematic cross-sectional view of the cover plate of the present invention.

Fig. 4 is a schematic view of the injection molding cover plate structure of the present invention.

Fig. 5 is a schematic sectional view of the injection molding cover plate of the present invention.

Fig. 6 is a schematic diagram of the structure of the pressing ring of the present invention.

Fig. 7 is a schematic view of the concave conical structure of the T-head end face of the present invention.

Fig. 8 is a schematic view of the multi-rib structure of the T-shaped head end surface of the present invention.

The structure comprises a pressure ring 1, an insulating seal body 2, a cover plate 3, a pure aluminum T head 4, a T head inner taper concave surface 5, a concave point 6, a pressure ring and T head welding ring 7, a liquid injection hole chamfer 8, a cover plate step plane 9, a T head annular seal rib 10, a cover plate upper step plane 11, a cover plate lower step plane 12, a step insulating seal body 13, a plane insulating seal body 14, a step lower insulating seal body 15, a step upper insulating seal body 16, a pressure ring step large hole 17, a pressure ring concave conical surface 18, a T head pole arc angle 19, a T head concave conical end surface 20, a T head annular rib 21, a positive pole lug 22, a T head large end surface 23 and a T head multi-circle annular rib 24.

Detailed Description

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

Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to the attached drawings, a sealing element (or called sealing cap) for a lithium ion battery capacitor comprises a pressure ring 1, an insulating sealing body 2, a cover plate 3, a pure aluminum T head 4, a T head inner taper concave surface 5, a concave point 6, a pressure ring and T head welding ring 7, a liquid injection hole chamfer 8, a cover plate step plane 9 and a T head annular sealing rib 10 which are sequentially arranged; the method is characterized in that the step center hole 17 and the concave conical surface 18 of the pressure ring are formed by punching; the insulating sealing body is made of high-low temperature resistant and corrosion resistant fluoroplastic, is provided with a step insulating sealing body 13, a plane insulating sealing body 14, a step lower insulating sealing body 15, a step upper insulating sealing body 16 and other structural types, and is embedded with the cover plate 3 to form a whole, so that the working procedure of a sealing assembly is simplified; the cover plate 3 is provided with a central hole, the central hole is provided with a plurality of structural types such as a step plane 9, an upper step plane 11, a lower step plane 12 and the like, the structural types and the insulating sealing body 2 are molded into a whole by injection, the sealing performance of the riveted sealing element is improved, meanwhile, the cover plate is also provided with a liquid injection hole, and the liquid injection hole is provided with a chamfer 8 which plays a role of guiding a sealing nail on the front surface of the cover plate; the pure aluminum T-shaped head is formed by extruding a wire rod through heading and extrusion, the manufacturing process is simple, the cost is low, the pole base surface of the T-shaped head pole column is provided with the conical concave surface 5, the annular rib 10, the concave conical end surface 20, the annular rib 21, the T-shaped head multi-ring annular rib 24 and other structural types, and meanwhile, the end surface of the T-shaped head pole column is provided with the arc angle 19. The method comprises the steps of inserting the small end of a T-head pole into an integrated injection molding cover plate with an insulating sealing body, enabling the outer flange of the cover plate to be in the same direction with the small end face of a pure aluminum T-head pole, then installing a compression ring into a combined piece of the injection molding cover plate and a T-head, attaching a small hole base surface of a compression ring step to the insulating sealing body and then riveting the combined piece to form the compression ring step, then extruding a concave point 6 in the center of the small end face of the T-head pole, driving a material of the small end of the T-head to move to the periphery of a large hole of the compression ring central step to enable the T-head to form an I-shaped structure, finally connecting the compression ring with the periphery of the T.

The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

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

Claims

1. A sealing element for a lithium ion battery capacitor comprises a pressure ring (1), an insulating sealing body (2), a cover plate (3), a pure aluminum T head (4), a T head inner taper concave surface (5), a concave point (6), a pressure ring and T head welding ring (7), a liquid injection hole chamfer (8), a cover plate step plane (9) and a T head annular sealing rib (10) which are arranged in sequence; the method is characterized in that the step center hole of the pressing ring is punched and formed; the insulating sealing body is made of high-low temperature resistant and corrosion resistant fluoroplastic and is embedded with the cover plate (3) to form a whole, so that the working procedure of the sealing assembly is simplified; the cover plate (3) is provided with a central hole, the back of the convex edge of the cover plate of the central hole is provided with a cover plate step plane (9) which is formed by punching and molding, the cover plate step plane and the insulating sealing body (2) are molded into a whole by injection, the sealing performance of the sealing element after riveting is improved, and meanwhile, the cover plate is also provided with a liquid injection hole, and the liquid injection hole is provided with a chamfer (8) which plays a role of guiding a sealing nail at the plane; the pure aluminum T-shaped head is formed by head beating and extrusion of a wire, the manufacturing process is simple, the cost is low, the base surface of the T-shaped head pole column is an insulating sealing body (2), and the T-shaped head pole column and the T-shaped head annular sealing rib (10) form a sealing structure; the integral injection molding cover plate with the insulating sealing body inserted into the small end of the T-head pole is inserted, the outer flange of the cover plate and the small end face of the pure aluminum T-head pole are in the same direction, the compression ring is installed in a combined piece of the injection molding cover plate and the T-head, the small hole base surface of the compression ring step is attached to the insulating sealing body and then riveted, a concave point (6) is pressed out from the center of the small end face of the T-head pole, the material of the small end of the T-head is driven to move to the periphery of the large hole of the compression ring central step, the T-head is formed into an I shape, finally the compression ring and the T-head welding ring (7) are connected and welded in a gap mode, the positive pole lug (22.

2. The sealing member for a lithium ion battery capacitor according to claim 1, wherein: the pressing ring and the T-head welding ring (7) are circumferentially welded or locally welded at the connecting part of the pressing ring and the T-head pole column periphery after the cap assembly and riveting are completed, so that the sealing failure leakage or contact internal resistance increase and the dispersion of charging and discharging curves caused by the loosening of the pressing ring in the long-term use process or vibration environment of the battery capacitor are prevented; the sealing performance of the cap and the connection reliability of the T-shaped head and the pressure ring are effectively improved, the contact internal resistance is reduced, and the charge and discharge platform of the battery capacitor is improved.

3. The sealing member for a lithium ion battery capacitor according to claim 1, wherein: the central hole is provided with a cover plate step plane (9) which is subjected to punch forming on the back surface of the convex edge of the cover plate, or the two surfaces or any one surface of the cover plate is provided with the cover plate step plane (9), the cover plate upper step plane (11) and the cover plate lower step plane (12) which are subjected to punch forming, the cover plate with the structure is integrated with the insulating sealing body into an injection molding cover plate after the embedded part is subjected to injection molding, the cap assembly process and the equipment asset investment are simplified, and the production efficiency is improved; meanwhile, the cover plate is provided with a secondary step through the structural types of the cover plate step plane (9), the cover plate upper step plane (11) and the cover plate lower step plane (12), so that the sealing reliability of the assembled cap is effectively improved, and the sealing performance of the cap is guaranteed; and the apron is annotated the liquid hole and is provided with chamfer (8), presses sealed nail process at battery capacitor, can effectively play the guide effect to sealed nail, prevents to press sealed nail in-process out of plumb apron plane or with annotate the liquid hole decentraction, to annotating the downthehole wall shovel wound, leads to the block cap to annotate liquid hole department weeping, has improved sealing performance.

4. The sealing member for a lithium ion battery capacitor according to claim 1 or 3, characterized in that: the injection molding cover plate is provided with a central hole and is respectively matched with the cover plate to be injection molded into an integrated injection molding cover plate, the insulating sealing body is fluoroplastic with high and low temperature resistance, corrosion resistance and softer hardness, and the structural types of the step insulating sealing body (13), the plane insulating sealing body (14), the step lower insulating sealing body (15) and the step upper insulating sealing body (16) are injection molded to fill the step plane of the central hole of the cover plate; in the cover plate assembling and riveting process, the insulating sealing body is simultaneously extruded by the inner end face of the T head and two faces of the pressing ring, the insulating sealing body is prevented from flowing radially under the action of the cover plate step plane (9), the cover plate upper step plane (11), the cover plate lower step plane (12) and the T head annular sealing rib (10), and the sealing performance of the nut cap is improved only in the stress compression in the plane material thickness direction.

5. The sealing member for a lithium ion battery capacitor according to claim 1, wherein: the concave points (6) are made of stainless steel materials and are punched to form a step center hole, the depth of the step (17) is 40% -60% of the material thickness, the base surface of the center hole is a concave conical surface (18) of the pressing ring, in the cap assembling and riveting process, the insulating sealing body is prevented from moving outwards in the radial direction and is pressed only in the plane material thickness direction, the compaction sealing performance is improved in a limited space range, and the manufacturing process of the pressing ring is simplified.

6. The sealing member for a lithium ion battery capacitor according to claim 1, wherein: the T head is made of pure aluminum wires through heading extrusion molding, the manufacturing process is simple, and the cost is low; the small end face of the T-head pole is provided with an arc angle (19) instead of a sharp angle, so that in the process of assembling the T-head pole with the injection molding cover plate, the short circuit of a cover cap and a battery caused by the fact that the sharp angle of the small end face of the T-head pole breaks an insulating sealing body in a center hole of the injection molding cover plate is avoided, and the insulating resistance and the safety performance of the battery are improved; the end surface (20) of the T-shaped head inner concave cone is an inner concave cone surface, and a single-circle annular rib (21) or a plurality of circles of annular ribs (24) for preventing the insulation sealing body from moving outwards are arranged on the inner concave cone surface; in the assembling and riveting process of the nut cap, the end face (20) of the T-head inner concave cone and a single ring of annular rib (21) or a plurality of rings of annular ribs (24) on the end face can double effectively prevent the insulating sealing body from moving outwards in the radial direction, and the insulating sealing body is extruded by the outer force of the end face (20) of the T-head inner concave cone and the pressing ring inner concave conical surface (18), so that the safety and the reliability of the sealing nut cap can be multiple ensured.

7. The sealing member for a lithium ion battery capacitor according to claim 1, wherein: the positive pole lug (22) is made of pure aluminum, and the large end face (23) of the T head and the positive pole lug (22) adopt a laser welding process.