CN221041298U

CN221041298U - Cylindrical lithium battery

Info

Publication number: CN221041298U
Application number: CN202322625264.3U
Authority: CN
Inventors: 宁亚军
Original assignee: Shanghai Xuanyi New Energy Development Co ltd
Current assignee: Shanghai Xuanyi New Energy Development Co ltd
Priority date: 2023-09-26
Filing date: 2023-09-26
Publication date: 2024-05-28
Anticipated expiration: 2033-09-26

Abstract

The utility model relates to a cylindrical lithium battery, which comprises a cylindrical steel shell, a terminal structure and an anode current collecting disc, wherein one axial end of the cylindrical steel shell is inwards concave to form a mounting groove, and the bottom of the mounting groove is provided with a mounting opening; terminal structure its setting is in mounting groove department, it includes: one end of the pole post penetrates through the mounting opening to extend into the cylindrical steel shell and is electrically connected with the positive electrode current collecting disc; the sealing ring is arranged at the mounting opening and sleeved on the pole to realize tightness between the pole and the cylindrical steel shell; the plastic part is sleeved outside the pole; and the metal ring is sleeved outside the plastic part and is provided with a welding ring which is adhered to the bottom surface of the mounting groove and is welded with the cylindrical steel shell. According to the utility model, the connection between the terminal structure and the cylindrical steel shell is realized through the laser welding of the metal ring and the cylindrical steel shell, the riveting process is replaced by the welding process, the problem of poor appearance of parts caused by riveting is avoided, the production efficiency is effectively improved, and the production cost is reduced.

Description

Cylindrical lithium battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a cylindrical lithium battery.

Background

With the development of electronic technology, lithium ion batteries are increasingly widely used in life of people, and the lithium ion batteries have a tendency to replace traditional batteries. Lithium ion batteries place higher demands on the performance of the batteries. The cylindrical lithium ion battery has high production efficiency, excellent cycle performance and good consistency due to standardized production flow, and is widely applied to automobile power batteries in recent years.

In the existing cylindrical lithium ion battery, the terminal structure is connected with the battery shell in a riveting mode in the installation process, and the terminal structure is low in integration level, so that the improvement of production efficiency is not facilitated, the production cost is increased, and meanwhile, the problem of poor appearance of parts easily caused by a riveting process is solved.

Disclosure of utility model

Based on this, it is necessary to need be in the installation to present terminal structure, need be connected terminal structure and battery case through the riveting mode, because terminal structure integrated level is low, is unfavorable for production efficiency's improvement, has increased manufacturing cost, adopts the easy part outward appearance bad problem that leads to of riveting technology simultaneously, provides a cylindrical lithium cell.

The utility model provides a cylindrical lithium battery which comprises a cylindrical steel shell, a terminal structure and an anode current collecting disc, wherein one axial end of the cylindrical steel shell is inwards concave to form a mounting groove, and the bottom of the mounting groove is provided with a mounting opening; terminal structure its setting is in mounting groove department, it includes:

one end of the pole post penetrates through the mounting opening to extend into the cylindrical steel shell and is electrically connected with the positive electrode current collecting disc;

the sealing ring is arranged at the mounting opening and sleeved on the pole to realize tightness between the pole and the cylindrical steel shell;

The plastic part is sleeved outside the pole; and

And the metal ring is sleeved outside the plastic part and is welded with the cylindrical steel shell.

According to the utility model, the connection between the terminal structure and the cylindrical steel shell is realized through the laser welding of the metal ring and the cylindrical steel shell, the riveting process is replaced by the welding process, the problem of poor appearance of parts caused by riveting is avoided, the production efficiency is effectively improved, and the production cost is reduced.

As a further improvement of the scheme, the plastic part is formed between the pole and the metal ring in an injection molding mode.

As a further improvement of the scheme of the utility model, the pole comprises a first pole section, a second pole section and a third pole section which are coaxially and sequentially connected; the diameters of the third column section, the first column section and the second column section are sequentially increased, and a plurality of blind holes are formed in one side, close to the first column section, of the second column section in the circumferential direction; the plastic part is sleeved outside the first column section and the second column section, is provided with a plurality of bulges and is respectively formed in the blind holes by injection molding;

And/or the pole is provided with a welding groove extending from the end face of the first pole section to the inside of the pole, and the electric connection between the pole and the positive electrode current collecting disc is realized through penetration welding on the bottom surface of the welding groove.

As a further development of the above-described solution of the utility model, the blind holes have a circular, quadrangular or triangular cross section;

and/or the thickness of the second column section is H1, H1 is more than or equal to 0.5mm and less than or equal to 2mm, the depth of the blind hole is H2, and H1 is less than or equal to 0.5 and less than 1;

And/or, the diameter D4 of the second column section and the diameter D1 of the third column section satisfy: d1 is more than or equal to 0.5, and D4 is less than 1.

As a further improvement of the scheme, the sealing ring is sleeved on the third column section, one end of the sealing ring, which is far away from the cylindrical steel shell, is integrally formed with an extension part, two side surfaces of the extension part are respectively attached to the second column section and the bottom surface of the mounting groove, and the outer peripheral surface of the extension part is abutted against the plastic part.

As a further improvement of the above-described aspect of the utility model, the welding groove has an inverted trapezoidal cross section, and the diameter D2 of the upper bottom surface of the trapezoid thereof and the diameter D3 of the first column section satisfy: d2 is more than or equal to 0.2, and d3 is more than or equal to 0.8;

and/or the thickness of the pole at the welding groove is H3, H3 is more than or equal to 0.2mm and less than 1.5mm.

As a further improvement of the scheme, the metal ring is provided with a welding ring attached to the bottom surface of the mounting groove, and is welded with the cylindrical steel shell through the welding ring; an annular groove is formed in the periphery of the plastic part, and a compression ring arranged in the annular groove is formed at one end, away from the welding ring, of the metal ring.

As a further improvement of the above-described aspect of the present utility model, the cylindrical lithium battery further includes an inner insulating plate disposed within the cylindrical steel case and disposed between the cylindrical steel case and the positive electrode current collecting disk.

As a further improvement of the scheme, the cylindrical lithium battery further comprises a battery core, wherein the battery core is arranged in the cylindrical steel shell, and the positive electrode lug of the battery core is electrically connected with the positive electrode current collecting disc.

As a further improvement of the scheme, the cylindrical lithium battery further comprises a negative electrode cover plate and a negative electrode current collecting disc, wherein the other end of the cylindrical steel shell in the axial direction is opened, the negative electrode cover plate is matched and connected with the opened end of the cylindrical steel shell in a sealing manner to seal the cylindrical steel shell, and the negative electrode current collecting disc is arranged in the cylindrical steel shell and is electrically connected with the negative electrode cover plate and the negative electrode tab of the battery cell.

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

1. According to the utility model, the connection between the terminal structure and the cylindrical steel shell is realized through the laser welding of the metal ring and the cylindrical steel shell, the riveting process is replaced by the welding process, the problem of poor appearance of parts caused by riveting is avoided, the production efficiency is effectively improved, and the production cost is reduced.

2. According to the utility model, the metal ring is used as a fixing part of the pole, so that the terminal structure has higher strength, and the safety performance of the battery is improved.

3. According to the utility model, the plastic piece is used for combining the pole and the metal ring together through an injection molding process, so that the integration level of the terminal structure is improved, the terminal structure is simpler and more convenient in the production process, the production efficiency of the terminal structure is improved, the terminal structure and the battery shell are convenient to assemble, and the production efficiency of the whole battery is improved.

Drawings

Fig. 1 is a schematic structural view of a battery terminal structure according to embodiment 1 of the present utility model;

FIG. 2 is a schematic view of the pole in FIG. 1;

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

FIG. 4 is a dimensional view of FIG. 3;

FIG. 5 is a schematic view of the metal ring of FIG. 1;

FIG. 6 is a top view of FIG. 5;

Fig. 7 is a schematic structural diagram of a cylindrical lithium battery according to embodiment 2 of the present utility model;

FIG. 8 is a diagram showing the connection between the terminal structure and the positive current collecting plate in FIG. 7;

Fig. 9 is a schematic diagram of the welding of the metal ring to the cylindrical steel shell of fig. 7.

Reference numerals: 1. a pole; 101. a first column section; 102. a second column section; 103. a third column section; 104. a welding groove; 105. a blind hole; 2. a metal ring; 201. welding rings; 202. a compression ring; 203. a notch; 3. a plastic part; 4. a seal ring; 401. an extension; 5. a cylindrical steel shell; 6. a battery cell; 7. a positive electrode current collecting plate; 8. a negative electrode current collecting plate; 9. a negative electrode cover plate; 10. an inner insulating plate.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, the present embodiment provides a battery terminal structure, which includes a pole 1, a metal ring 2, a plastic member 3, and a sealing ring 4.

Referring to fig. 2-4, in this embodiment, the pole 1 includes a first pole segment 101, a second pole segment 102, and a third pole segment 103 that are coaxially and sequentially integrally connected, and the first pole segment 101, the second pole segment 102, and the third pole segment 103 are integrally formed. The diameters of the third column section 103, the first column section 101 and the second column section 102 are sequentially increased, and the diameter D4 of the second column section 102 and the diameter D1 of the third column section 103 satisfy the following conditions: d1 is more than or equal to 0.5, and D4 is less than 1. The pole 1 is provided with a welding groove 104 extending from the end face of the first pole section 101 to the inside thereof, the welding groove 104 has an inverted trapezoid cross section, and the diameter D2 of the trapezoid upper bottom surface thereof and the diameter D3 of the first pole section 101 satisfy: d2 is more than or equal to 0.2, d3 is more than or equal to 0.8, and the thickness of the pole 1 at the welding groove 104 is H3, wherein H3 is more than or equal to 0.2mm and less than 1.5mm. Six blind holes 105 are circumferentially and equidistantly formed in one side, close to the first column section 101, of the second column section 102. In the present embodiment, the blind hole 105 is a hole body with a circular cross section, and in other embodiments, the blind hole 105 may be a hole body with a quadrangular or triangular cross section as long as the stability of the pole 1 is satisfied. In this embodiment, the pole 1 is made of aluminum.

The metal ring 2 is coaxially arranged outside the first and second column sections 101, 102 of the pole 1. With reference to fig. 5 and 6, a welding ring 201 extending radially outwards is integrally formed at one end of the metal ring 2 near the third column section 103, the welding ring 201 is used for welding connection with a battery shell, and the width of the welding ring 201 is L ₃,0.5mm≤L₃ -4 mm. In this embodiment, the metal ring 2 is a steel ring, however, in other embodiments, the metal ring 2 may be made of other metal materials. The metal ring 2 is formed integrally with a pressing ring 202 extending radially inward thereof near one end of the first column section 101, and four notches 203 are provided circumferentially equidistant on the inner peripheral surface of the pressing ring 202. In the present embodiment, the notch 203 has a square cross section, however, in other embodiments, the notch 203 may have a semicircular cross section as long as the stability of the metal ring 2 is satisfied. In this embodiment, the metal ring 2 is provided with smoothly transition fillets at each bending portion.

The plastic part 3 is formed between the metal ring 2 and the first column section 101 and the second column section 102 of the pole 1 by injection molding, so that the metal ring 2 and the pole 1 are mutually insulated. The plastic part 3 is positioned at the periphery of the first column section 101 and is provided with an annular groove, the compression ring 202 is embedded in the annular groove during injection molding of the plastic part 3, and four clamping blocks respectively formed in the four notches 203 are arranged in the annular groove. And the plastic part 3 is further provided with six protrusions formed in the six blind holes 105, respectively. Through the cooperation of protruding and blind hole 105 and the anti-torsion design of the cooperation of breach 203 and fixture block, can effectively avoid the rotation between plastic part 3 and metal ring 2, the utmost point post 1. In order to ensure the reliability of torsion prevention, the depth of the notch 203 in the radial direction of the pressing ring 202 is L ₁,0＜L₁ -4 mm; the width of the notch 203 is L ₂,0.5mm≤L₂ -4 mm; the thickness of the second column section 102 is H1, H1 is more than or equal to 0.5mm and less than or equal to 2mm, the depth of the blind hole 105 is H2, H2 is more than or equal to 0.5, and H1 is less than 1.

The sealing ring 4 is sleeved on the third column section 103 of the pole 1, an extending part 401 which extends outwards in the radial direction and is attached to the second column section 102 is integrally formed at one end, close to the second column section 102, of the sealing ring 4, and the outer peripheral surface of the extending part 401 abuts against the plastic part 3.

The battery terminal structure of this embodiment utilizes plastic part 3 to combine post 1 and metal ring 2 together through the injection molding technology through above structure setting, improves terminal structure's integrated level for terminal structure is more simple and convenient in the production process, improves terminal structure's production efficiency, makes things convenient for terminal structure and battery case's equipment, thereby improves the production efficiency of whole battery. The connection between the terminal structure and the battery shell can be realized through the laser welding of the metal ring 2 and the battery steel shell 5, the riveting process is replaced by the welding process, the problem of poor appearance of parts caused by riveting is avoided, the production efficiency is effectively improved, and the production cost is reduced. The steel ring is used as a fixing part of the pole 1, so that the terminal structure has higher strength, and the safety performance of the battery is improved.

Example 2

Referring to fig. 7 and 8, the present embodiment provides a cylindrical lithium battery, which includes a cylindrical steel shell 5, a battery core 6, a terminal structure, a positive electrode current collecting plate 7, a negative electrode current collecting plate 8 and a negative electrode cover plate 9, wherein the terminal structure adopts the battery terminal structure of embodiment 1.

An installation groove is formed in the inward concave shape of one axial end of the cylindrical steel shell 5, an installation opening is formed in the bottom of the installation groove, and an inner insulating plate 10 is arranged on the inner surface of the end of the cylindrical steel shell 5. The other axial end of the cylindrical steel shell 5 is arranged in an open mode.

The battery cell 6 is arranged in the cylindrical steel shell 5 and is provided with a positive electrode lug and a negative electrode lug, and the positive electrode lug is arranged on one side of the battery cell 6 close to the mounting opening. The positive electrode current collecting disc 7 and the negative electrode current collecting disc 8 are respectively arranged at two ends of the battery core 6, and the positive electrode current collecting disc 7 and the negative electrode current collecting disc 8 are respectively and electrically connected with the positive electrode lug and the negative electrode lug.

The terminal structure is disposed at the mounting slot position. One end of the third column section 103 of the pole 1, which is far away from the second column section 102, penetrates through the mounting opening and stretches into the cylindrical steel shell 5, and the electric connection between the pole 1 and the positive electrode current collecting disc 7 is realized through penetration welding at the bottom surface of the welding groove 104. The outer peripheral surface of the sealing ring 4 is attached to the inner wall surface of the mounting hole, and the outer extension part of the sealing ring 4 is attached to the bottom surface of the mounting hole. The welding ring 201 of the metal ring 2 is attached to the bottom surface of the mounting groove, and the metal ring 2 is welded and connected with the cylindrical steel shell 5 through laser welding. In the process of assembling the terminal structure with the cylindrical steel shell 5, please combine fig. 9, firstly, the terminal structure is integrally placed in the mounting groove, and pressure is applied to the terminal structure, so that the sealing ring 4 is compressed to achieve the sealing effect of the mounting opening, then laser welding is carried out at the matching position of the cylindrical steel shell 5 and the metal ring 2, the terminal structure is fixed with the cylindrical steel shell 5, after welding, the aluminum pole 1 can be pressed through the pressing ring 202, the pole 1 is prevented from being separated, and the width of the welding ring 201 is L ₃,0.5mm≤L₃ is less than or equal to 4mm for ensuring the welding effect. In this embodiment, the end face of the first column section 101 of the pole 1, which is far away from the end face of the second column section 102, is used for welding with the busbar of the module/pack, so as to realize the electrical connection between the electrical core 6 and the electrical core 6. In order to ensure the welding area of the terminal structure and the positive electrode current collecting disc 7 and the welding area of the positive electrode terminal and the bus bar, the diameter D2 of the trapezoid upper bottom surface of the welding groove 104 and the diameter D3 of the first column section 101 are set to be more than or equal to 0.2 and less than or equal to 0.8; in order to ensure the reliability of the sealing plane, the diameter D4 of the second column section 102 and the diameter D1 of the third column section 103 are set to satisfy: d1 is more than or equal to 0.5, and D4 is less than 1; in order to ensure the reliability of the compression amount of the sealing ring 4 and the strength of the aluminum pole 1, the thickness of the second column section 102 is set to H1 to satisfy the following conditions: h1 is more than or equal to 0.5mm and less than or equal to 2mm.

The negative electrode cover plate 9 is matched and connected with the open end of the cylindrical steel shell 5 in a sealing way so as to seal the cylindrical steel shell 5, and the negative electrode cover plate 9 is electrically connected with the negative electrode current collecting disc 8.

Through the arrangement of the structure, the cylindrical battery of the embodiment utilizes the plastic part 3 to combine the pole 1 and the metal ring 2 together through an injection molding process, so that the integration level of the terminal structure is improved, the terminal structure is simpler and more convenient in the production process, the production efficiency of the terminal structure is improved, the terminal structure and the cylindrical steel shell 5 are convenient to assemble, and the production efficiency of the whole battery is improved; the connection of the terminal structure and the cylindrical steel shell 5 is realized through the laser welding of the metal ring 2 and the cylindrical steel shell 5, the riveting process is replaced by the welding process, the problem of poor appearance of parts caused by riveting is avoided, the production efficiency is effectively improved, and the production cost is reduced. The steel ring is used as a fixing part of the pole 1, so that the terminal structure has higher strength, and the safety performance of the battery is improved.

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

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. The cylindrical lithium battery comprises a cylindrical steel shell (5), a terminal structure and an anode current collecting disc (7), and is characterized in that one axial end of the cylindrical steel shell (5) is concavely provided with a mounting groove, and the bottom of the mounting groove is provided with a mounting opening; terminal structure its setting is in mounting groove department, it includes:

One end of the pole column (1) penetrates through the mounting opening to extend into the cylindrical steel shell (5) and is electrically connected with the positive electrode current collecting disc (7);

The sealing ring (4) is arranged at the mounting opening and sleeved on the pole (1) to realize tightness between the pole (1) and the cylindrical steel shell (5);

the plastic part (3) is sleeved outside the pole (1); and

And the metal ring (2) is sleeved outside the plastic part (3) and is welded with the cylindrical steel shell (5).

2. The cylindrical lithium battery according to claim 1, wherein the plastic part (3) is injection-molded between the pole (1) and the metal ring (2).

3. The cylindrical lithium battery according to claim 2, wherein the polar column (1) comprises a first column section (101), a second column section (102) and a third column section (103) which are coaxially and sequentially connected; the diameters of the third column section (103), the first column section (101) and the second column section (102) are sequentially increased, and a plurality of blind holes (105) are formed in the circumferential direction of one side, close to the first column section (101), of the second column section (102); the plastic part (3) is sleeved outside the first column section (101) and the second column section (102), the plastic part (3) is provided with a plurality of bulges, and the bulges are respectively formed in the blind holes (105) in an injection molding mode;

And/or, the pole (1) is provided with a welding groove (104) extending from the end face of the first pole section (101) to the inside of the pole, and the electric connection between the pole (1) and the positive electrode current collecting disc (7) is realized through penetration welding on the bottom surface of the welding groove (104).

4. A cylindrical lithium battery according to claim 3, characterized in that the blind hole (105) has a circular, quadrangular or triangular cross section;

And/or the thickness of the second column section (102) is H1, H1 is more than or equal to 0.5mm and less than or equal to 2mm, the depth of the blind hole (105) is H2, and H1 is more than or equal to 0.5 and less than 1;

And/or the diameter D4 of the second column section (102) and the diameter D1 of the third column section (103) satisfy: d1 is more than or equal to 0.5, and D4 is less than 1.

5. The cylindrical lithium battery according to claim 3, wherein the sealing ring (4) is sleeved on the third column section (103), an extending part (401) is integrally formed at one end, far away from the cylindrical steel shell (5), of the sealing ring (4), two side surfaces of the extending part (401) are respectively attached to the second column section (102) and the bottom surface of the mounting groove, and the outer peripheral surface of the extending part (401) is abutted to the plastic part (3).

6. A cylindrical lithium battery according to claim 3, characterized in that the welding groove (104) has an inverted trapezoidal cross section, and the diameter D2 of the trapezoidal upper bottom surface thereof and the diameter D4 of the first pillar section (101) satisfy: d2 is more than or equal to 0.2, and d3 is more than or equal to 0.8;

and/or the thickness of the pole (1) at the welding groove (104) is H3, wherein H3 is more than or equal to 0.2mm and less than or equal to 1.5mm.

7. The cylindrical lithium battery according to claim 1, wherein the metal ring (2) is provided with a welding ring (201) attached to the bottom surface of the mounting groove, and the metal ring (2) is welded with the cylindrical steel shell (5) through the welding ring (201); an annular groove is formed in the periphery of the plastic part (3), and a compression ring (202) arranged in the annular groove is formed at one end, away from the welding ring (201), of the metal ring (2).

8. The cylindrical lithium battery according to claim 1, further comprising an inner insulating plate (10), the inner insulating plate (10) being arranged inside the cylindrical steel shell (5) and between the cylindrical steel shell (5) and the positive current collecting disc (7).

9. The cylindrical lithium battery according to claim 1, further comprising an electric core (6), wherein the electric core (6) is arranged in the cylindrical steel shell (5), and a positive electrode tab of the electric core (6) is electrically connected with the positive electrode current collecting disc (7).

10. The cylindrical lithium battery according to claim 9, further comprising a negative electrode cover plate (9) and a negative electrode current collecting disc (8), wherein the other axial end of the cylindrical steel shell (5) is opened, the negative electrode cover plate (9) is matched and connected with the open end of the cylindrical steel shell (5) in a sealing manner to seal the cylindrical steel shell (5), and the negative electrode current collecting disc (8) is arranged in the cylindrical steel shell (5) and is electrically connected with the negative electrode cover plate (9) and the negative electrode tab of the battery cell (6).