CN221226504U - Connecting piece and square lithium ion battery - Google Patents

Abstract

The utility model provides a connecting piece and a square lithium ion battery, and relates to the technical field of lithium batteries, wherein the connecting piece comprises an upper connecting piece and a lower connecting piece, the lower connecting piece is arranged on the lower end face of the upper connecting piece, and the upper end face of the upper connecting piece is used for being connected with a pole; two large side surfaces of the lower connecting sheet are used for being welded with the electrode lugs. The upper connecting piece of the connecting piece is used for being connected with the pole, and two large side surfaces of the lower connecting piece are respectively welded with one side of the pole lug; therefore, the lugs on the two sides of the lower connecting piece are uniformly stressed, and the connection reliability of the lower connecting piece and the lugs is ensured.

Description

Connecting piece and square lithium ion battery

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a connecting piece and a square lithium ion battery.

Background

Along with the proposal of the national 'double carbon' target, the method is favorable for guiding green technical innovation, improving global competitiveness of industry and economy, continuously advancing industrial structure and energy structure adjustment in China, and accelerating the reduction of carbon emission steps. The secondary battery has the unique advantages of recycling and the like, and the future application field of the secondary battery is continuously widened. The lithium ion battery has remarkable advantages, is mainly applied to the fields of tablet computers, notebook computers, mobile phones, electronic atomizers, electric tools and the like at the present stage, and is a product which is developed in the future of the secondary battery industry and is important along with development of new energy automobiles and energy storage markets.

As the demand of lithium ion batteries increases, there is a higher demand for the performance of lithium ion batteries. The lithium ion battery for the electric automobile has higher requirements on the multiplying power discharge performance of the lithium ion battery, and the battery cell tab is required to have enough capacity for bearing overcurrent. At present, the power battery mainly comprises an aluminum shell cylinder, a soft package and a square aluminum shell, the space utilization rate of the cylinder battery is lower, the single energy density of the soft package battery is higher than that of the square battery core, but the grouping efficiency is lower, and the current energy density conversion rate is estimated to be about 80%. Square aluminum shells are favored by manufacturers because of space saving and high safety.

Disclosure of utility model

The utility model aims to provide a connecting piece and a square lithium ion battery so as to solve the technical problems that the prior connecting piece is connected with a tab, the tab on one side of the connecting piece is stressed greatly, and the tab on the other side of the connecting piece is pulled greatly.

The utility model provides a connecting piece, which comprises an upper connecting piece and a lower connecting piece, wherein the lower connecting piece is arranged on the lower end face of the upper connecting piece, and the upper end face of the upper connecting piece is used for being connected with a pole;

Two large side surfaces of the lower connecting sheet are used for being welded with the electrode lugs.

In an alternative embodiment, the lower end face of the upper connecting piece is provided with embossments.

In an alternative embodiment, the embossing is shaped as a concave trapezoidal sink table.

In an alternative embodiment, the lower connecting piece is vertically arranged on the lower end face of the upper connecting piece, and the lower connecting piece is positioned in the middle of the upper connecting piece.

The upper connecting piece of the connecting piece is used for being connected with the pole, and two large side surfaces of the lower connecting piece are respectively welded with one side of the pole lug; therefore, the lugs on the two sides of the lower connecting piece are uniformly stressed, and the connection reliability of the lower connecting piece and the lugs is ensured.

The utility model provides a square lithium ion battery, which comprises a winding core, a battery core cover plate and the connecting piece in any one of the two previous embodiments;

The winding core is provided with a winding core long hole, and one side of the winding core, which faces the battery core cover plate, is provided with a positive electrode tab component and a negative electrode tab component;

the positive electrode tab assembly comprises two positive electrode tab groups which are respectively positioned at two sides of the winding core long hole;

The negative electrode tab assembly comprises two negative electrode tab groups which are respectively positioned at two sides of the winding core long hole;

Two large side surfaces of the lower connecting piece of one connecting piece are respectively welded with one positive electrode lug group, and two large side surfaces of the lower connecting piece of the other connecting piece are respectively welded with one negative electrode lug group.

In an alternative embodiment, a lower plastic is arranged on the lower end face of the battery cell cover plate, and a first positioning groove and a second positioning groove are formed in one side, far away from the battery cell cover plate, of the lower plastic;

A first positioning hole is formed in the first positioning groove, and a second positioning hole is formed in the second positioning groove;

The battery cell cover plate is provided with a first assembly hole corresponding to the first positioning hole and a second assembly hole corresponding to the second positioning hole;

and a positive electrode pole is assembled in the first assembly hole, and a negative electrode pole is assembled in the second assembly hole.

In an alternative embodiment, the positive electrode post includes a positive electrode post body and a first welding plate, and a lower end of the positive electrode post body is disposed on the first welding plate;

The first welding plate is assembled in the first positioning groove, and the positive pole post main body sequentially penetrates through the first positioning hole and the first assembling hole;

the negative electrode post comprises a negative electrode post main body and a second welding plate, and the lower end of the negative electrode post main body is arranged on the second welding plate;

The second welding plate is assembled in the second positioning groove, and the negative pole post main body sequentially penetrates through the second positioning hole and the second assembly hole.

In an alternative embodiment, the positive electrode riveting block and the negative electrode riveting block are further included; the positive electrode riveting block is arranged on the upper end face of the battery cell cover plate and is riveted on the positive electrode post;

The negative electrode riveting block is arranged on the upper end face of the battery cell cover plate and is riveted on the negative electrode post.

In an alternative embodiment, three stop frames are arranged on the lower end face of the lower plastic along the length direction of the lower plastic; the positive electrode tab assembly is arranged between the two stop frames, and the negative electrode tab assembly is arranged between the two stop frames.

In an alternative embodiment, a first positioning protrusion and a second positioning protrusion are arranged on the upper end surface of the lower plastic;

And a third positioning groove matched with the first positioning protrusion and a fourth positioning groove matched with the second positioning protrusion are formed in the lower end face of the battery cell cover plate.

Compared with the prior art, the square lithium ion battery provided by the utility model has the connecting piece provided by the utility model, so that the square lithium ion battery has all the beneficial effects of the connecting piece provided by the utility model.

Drawings

In order to more clearly illustrate the embodiments of the present utility model 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 utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a connector according to an embodiment of the present utility model;

Fig. 2 is an exploded view (without a casing) of a square lithium ion battery according to an embodiment of the present utility model;

Fig. 3 is a schematic structural diagram of a winding core of the square lithium ion battery shown in fig. 2;

FIG. 4 is a schematic view of the lower plastic of the square lithium ion battery shown in FIG. 2;

FIG. 5 is a schematic view of another angle of the lower plastic shown in FIG. 4;

Fig. 6 is a schematic structural diagram of a cell cover plate of the square lithium ion battery shown in fig. 2;

FIG. 7 is a schematic view of the battery cell cover plate shown in FIG. 6 at another angle;

Fig. 8 is a schematic structural view of a positive electrode post of the square lithium ion battery shown in fig. 2;

fig. 9 is a schematic view of the positive electrode post shown in fig. 8 at another angle.

Icon: 100-connecting piece; 101-upper connecting sheets; 102-lower connecting piece; 200-winding the core; 300-winding core long holes; 400-positive electrode tab assembly; 500-a negative electrode tab assembly; 600-lower plastic; 601-a first positioning hole; 602-a second positioning hole; 603-a first positioning protrusion; 604-a second positioning protrusion; 605-stop rack; 606-a first positioning groove; 607-a second detent; 700-cell cover plate; 800-positive electrode post; 801-positive electrode post body; 802-a first welding plate; 900-third positioning groove; 110-fourth positioning grooves; 120-a first assembly hole; 130-a second mounting hole; 140-positive electrode riveting block.

Detailed Description

The terms "first," "second," "third," and the like are used merely for distinguishing between descriptions and not for indicating a sequence number, nor are they to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "inner", "outer", "left", "right", "upper", "lower", etc., are based on directions or positional relationships shown in the drawings, or directions or positional relationships conventionally put in use of the product of the application, are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present application.

In the description of the present application, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements.

The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings.

Examples

Referring to fig. 1, the present utility model provides a connection member 100, which includes an upper connection piece 101 and a lower connection piece 102, wherein the lower connection piece 102 is disposed on a lower end surface of the upper connection piece 101, and an upper end surface of the upper connection piece 101 is used for connecting with a pole;

The two large sides of the lower connecting piece 102 are used for welding with the tab.

In some embodiments, the upper connection pad of the connector 100 is used for welding with a pole and the lower connection pad 102 is used for welding with a tab; the connecting piece 100 is suitable for a winding battery core, a winding core long hole 300 is formed in the winding battery core, lugs are arranged on two sides of the winding core long hole 300, the lower connecting piece 102 is arranged corresponding to the winding core long hole 300, two large sides of the lower connecting piece 102 are welded with one lug respectively, at the moment, the lugs on two sides of the lower connecting piece 102 can be kept symmetrical as much as possible, and therefore stability of connection between the lower connecting piece 102 and the lugs is guaranteed.

In an alternative embodiment, the lower end surface of the upper connecting piece 101 is provided with embossments.

In an alternative embodiment, the embossing is shaped as a concave trapezoidal sink table.

In an alternative embodiment, the lower connecting piece 102 is vertically disposed on the lower end surface of the upper connecting piece 101, and the lower connecting piece 102 is located at a middle position of the upper connecting piece 101.

In some embodiments, the lower connection piece 102 is provided with an embossing, which generally has a depth of less than 0.5mm, and when the upper connection piece 101 is welded with the pole by laser, the embossing reflects the laser obliquely when the laser is irradiated to the embossing, avoiding the laser source, reducing the reflected laser capability, thereby improving the efficiency of welding the lower connection piece 102 with the pole and improving the productivity.

The upper connecting piece 101 of the connecting piece is used for being connected with a pole, and two large side surfaces of the lower connecting piece 102 are respectively welded with one pole lug; in this way, the lugs on two sides of the lower connecting piece 102 are uniformly stressed, and the reliability of the connection between the lower connecting piece 102 and the lugs is ensured.

Referring to fig. 2-9, the present utility model provides a square lithium ion battery, comprising a winding core 200, a battery cover 700 and the connector 100 according to any one of the two previous embodiments;

The winding core 200 has a winding core long hole 300, and a positive electrode tab assembly 400 and a negative electrode tab assembly 500 are arranged on one side of the winding core 200 facing the battery cell cover plate 700;

The positive electrode tab assembly 400 includes two positive electrode tab groups, which are respectively located at two sides of the winding core long hole 300;

the negative electrode tab assembly 500 includes two negative electrode tab groups, which are respectively located at two sides of the winding core long hole 300;

Two large sides of the lower connecting piece 102 of one connecting piece 100 are respectively welded with one positive electrode tab set, and two large sides of the lower connecting piece 102 of the other connecting piece 100 are respectively welded with one negative electrode tab set.

In some embodiments, the winding core 200 has a winding core long hole 300, and the winding core 200 generally includes a positive electrode tab, a negative electrode tab, a separator, a positive electrode tab, and a negative electrode tab; the battery pack comprises a positive pole piece, an isolating film and a negative pole piece, wherein the isolating film is arranged between the positive pole piece and the negative pole piece, each layer of positive pole piece is provided with a positive pole lug, all positive pole lugs are stacked to form a positive pole multi-pole lug structure, each layer of negative pole piece is provided with a negative pole lug, all negative pole lugs are stacked to form a negative pole multi-pole lug structure, the end part of the isolating film is provided with a part exceeding the positive pole piece and the negative pole piece, the part surrounds a winding battery cell for at least one circle, and the part is fixedly bonded with the part of the isolating film located in an inner layer.

A positive electrode tab group and a negative electrode tab group are respectively provided on both sides of the winding core long hole 300.

Two large sides of the lower connecting piece 102 of one connecting piece 100 are welded with one positive electrode tab set respectively, and two large sides of the lower connecting piece 100 of one connecting piece 100 are welded with one negative electrode tab set respectively.

The positive electrode column 800 on the cell cover plate 700 is connected with the upper connecting sheet 101 of one connecting piece 100, and the negative electrode column is connected with the other connecting piece 100.

In an alternative embodiment, a lower plastic 600 is disposed on the lower end surface of the battery cell cover plate 700, and a first positioning groove 606 and a second positioning groove 607 are disposed on one side of the lower plastic 600 away from the battery cell cover plate 700;

A first positioning hole 601 is arranged in the first positioning groove 606, and a second positioning hole 602 is arranged in the second positioning groove 607;

The battery cell cover plate 700 is provided with a first assembly hole 120 corresponding to the first positioning hole 601 and a second assembly hole 130 corresponding to the second positioning hole 602;

A positive electrode tab 800 is assembled in the first assembly hole 120, and a negative electrode tab is assembled in the second assembly hole 130.

Referring to fig. 8, in an alternative embodiment, the positive electrode tab 800 includes a positive electrode tab main body 801 and a first welding plate 802, and a lower end of the positive electrode tab main body 801 is disposed on the first welding plate 802;

The first welding plate 802 is assembled in the first positioning groove 606, and the positive electrode post main body 801 sequentially penetrates through the first positioning hole 601 and the first assembling hole 120;

the negative electrode post comprises a negative electrode post main body and a second welding plate, and the lower end of the negative electrode post main body is arranged on the second welding plate;

The second welding plate is assembled in the second positioning groove 607, and the negative electrode post main body sequentially penetrates through the second positioning hole 602 and the second assembling hole 130.

A lower plastic cement 600 is arranged on the lower end surface of the battery cell cover plate 700, the positive electrode pole main body 801 is inserted into the first positioning hole 601 of the lower plastic cement 600 from one side of the lower plastic cement 600 far away from the battery cell cover plate 700, and the first welding plate 802 is assembled in the first positioning groove 606; the first positioning groove 606 makes the first welding plate 802 unable to rotate, that is, the positive electrode post main body 801 also unable to rotate; and the first positioning groove 606 and the first welding plate 802 have a larger contact area, and the first welding plate 802 is beneficial to keeping the lower plastic 600 tightly connected with the cell cover plate 700.

In an alternative embodiment, positive and negative rivet blocks 140, 140 are also included; the positive electrode riveting block 140 is arranged on the upper end face of the battery cell cover plate 700 and is riveted on the positive electrode post 800;

The negative electrode riveting block is arranged on the upper end face of the battery cell cover plate 700 and is riveted on the negative electrode post.

Referring to fig. 4, in an alternative embodiment, three stopper frames 605 are provided on the lower end surface of the lower plastic 600 along the length direction of the lower plastic 600; the positive tab assembly 400 is disposed between the two stopper frames 605, and the negative tab assembly 500 is disposed between the two stopper frames 605.

Three stop frames 605 are arranged on the lower end face of the lower plastic 600, and the stop frames 605 keep a certain gap between the upper plastic and the winding core 200, so that deformation in the feeding process is avoided, welding is affected, and the safety performance is further improved.

In an alternative embodiment, a first positioning protrusion 603 and a second positioning protrusion 604 are disposed on the upper end surface of the lower plastic 600;

A third positioning groove 900 matching the first positioning protrusion 603 and a fourth positioning groove 110 matching the second positioning protrusion 604 are provided on the lower end surface of the cell cover plate 700.

Compared with the prior art, the square lithium ion battery provided by the utility model has the connecting piece 100 provided by the utility model, so that the square lithium ion battery has all the beneficial effects of the connecting piece 100 provided by the utility model.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. The connecting piece (100) is characterized by comprising an upper connecting piece (101) and a lower connecting piece (102), wherein the lower connecting piece (102) is arranged on the lower end face of the upper connecting piece (101), and the upper end face of the upper connecting piece (101) is used for being connected with a pole;

two large sides of the lower connecting sheet (102) are used for being welded with the pole lugs.

2. The connector (100) according to claim 1, wherein the lower end face of the upper connecting piece (101) is provided with embossments.

3. The connector (100) of claim 2, wherein the embossment is in the shape of a concave trapezoidal sink deck.

4. The connector (100) according to claim 2, wherein the lower connecting piece (102) is vertically disposed on a lower end face of the upper connecting piece (101), and the lower connecting piece (102) is located at an intermediate position of the upper connecting piece (101).

5. A square lithium ion battery, characterized in that it comprises a winding core (200), a cell cover (700) and two connectors (100) according to any of claims 1-4;

The winding core (200) is provided with a winding core long hole (300), and one side of the winding core (200) facing the battery cell cover plate (700) is provided with a positive electrode tab assembly (400) and a negative electrode tab assembly (500);

The positive electrode tab assembly (400) comprises two positive electrode tab groups which are respectively positioned at two sides of the winding core long hole (300);

the negative electrode tab assembly (500) comprises two negative electrode tab groups which are respectively positioned at two sides of the winding core long hole (300);

Two large side surfaces of the lower connecting piece (102) of one connecting piece (100) are respectively welded with one positive electrode lug group, and two large side surfaces of the lower connecting piece (102) of the other connecting piece (100) are respectively welded with one negative electrode lug group.

6. The square lithium ion battery according to claim 5, wherein a lower plastic (600) is arranged on the lower end surface of the battery cell cover plate (700), and a first positioning groove (606) and a second positioning groove (607) are arranged on one side of the lower plastic (600) away from the battery cell cover plate (700);

A first positioning hole (601) is formed in the first positioning groove (606), and a second positioning hole (602) is formed in the second positioning groove (607);

the battery cell cover plate (700) is provided with a first assembly hole (120) corresponding to the first positioning hole (601) and a second assembly hole (130) corresponding to the second positioning hole (602);

A positive electrode post (800) is assembled in the first assembly hole (120), and a negative electrode post is assembled in the second assembly hole (130).

7. The square lithium ion battery according to claim 6, wherein the positive electrode post (800) includes a positive electrode post body (801) and a first welding plate (802), a lower end of the positive electrode post body (801) being disposed on the first welding plate (802);

The first welding plate (802) is assembled in the first positioning groove (606), and the positive pole post main body (801) sequentially penetrates through the first positioning hole (601) and the first assembling hole (120);

the negative electrode post comprises a negative electrode post main body and a second welding plate, and the lower end of the negative electrode post main body is arranged on the second welding plate;

The second welding plate is assembled in the second positioning groove (607), and the cathode post main body sequentially penetrates through the second positioning hole (602) and the second assembly hole (130).

8. The square lithium ion battery of claim 7, further comprising a positive rivet block (140) and a negative rivet block; the positive electrode riveting block (140) is arranged on the upper end face of the battery cell cover plate (700) and is riveted on the positive electrode column (800);

The negative electrode riveting block is arranged on the upper end face of the battery cell cover plate (700) and is riveted on the negative electrode post.

9. The square lithium ion battery according to claim 6, wherein three stop frames (605) are arranged on the lower end surface of the lower plastic (600) along the length direction of the lower plastic (600); the positive electrode tab assembly (400) is arranged between the two stop frames (605), and the negative electrode tab assembly (500) is arranged between the two stop frames (605).

10. The square lithium ion battery according to claim 6, wherein a first positioning protrusion (603) and a second positioning protrusion (604) are arranged on the upper end surface of the lower plastic (600);

A third positioning groove (900) matched with the first positioning protrusion (603) and a fourth positioning groove (110) matched with the second positioning protrusion (604) are arranged on the lower end face of the battery cell cover plate (700).