Novel lithium ion battery

Abstract

The utility model discloses a novel lithium ion battery which is divided into a shell and cover integrated structure, a side plate structure, a connecting piece and a core body, the shell and cover integrated structure reserves a position for a large surface, the core body can be directly placed into a shell from the large surface, the shell and cover integrated structure consists of a pole column plate and a main shell, pole columns are distributed on the pole column plate, each pole column is provided with an L-shaped rivet structure, and the main shell is provided with a connecting piece. The L-shaped rivet is bent downwards to form a structure with a buckle groove, the connecting piece is bent upwards to form a structure with a buckle boss, after the core body and the connecting piece are welded, in the process of placing the core body into the shell, the buckle boss of the connecting piece can be directly clamped with the buckle groove of the rivet, welding is not needed, and finally the side plate structure and the shell cover are integrally welded. Therefore, the laser welding procedure in the battery cell assembling process is reduced, the manpower and equipment requirements are reduced, the input cost is reduced, and the assembling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion batteries, in particular to a novel lithium ion battery. Background Art

[0002] With the development of the world's electrification revolution, the use of power batteries is becoming more and more widespread. Among them, lithium-ion batteries have become the most mainstream electrochemical power source currently used. Because of their significant advantages such as high specific energy and long cycle life, they are clean and efficient batteries with great development prospects.

[0003] At present, the structural design and assembly of square shell batteries mostly adopt the method of welding the current collector of the pole core to the connecting piece first, then welding the connecting piece to the cover plate, and finally inserting the shell and performing peripheral welding on the cover plate and the shell. This traditional process has many laser welding steps, increases the manpower and equipment requirements, has a high investment cost, and has a low assembly efficiency. Therefore, how to reduce the assembly process of the battery cell, reduce the production cost of the battery cell and improve work efficiency is an urgent problem to be solved by R&D workers. Utility Model Content

[0004] The utility model provides a novel lithium-ion battery, which is used for reducing the laser welding process in the assembly process of the battery core, reducing the production cost of the battery core, and improving the working efficiency of the battery core assembly.

[0005] The utility model adopts the following technical scheme: a novel lithium-ion battery, the battery core structure is square, including: a shell cover integrated structure 1, a connecting piece 2, a core body 3 and a side plate structure 4.

[0006] The shell cover integrated structure 1 is composed of a pole plate 11 and a main shell 12. The poles are distributed on the pole plate 11 and have an L-shaped rivet structure. The inner side of the L-shaped rivet includes a plurality of downwardly concave snap grooves.

[0007] The connecting piece 2 includes a welding area, a connecting area and a buckle area. The buckle area has a plurality of buckle bosses matching the buckle grooves. The connecting piece 2 is buckled and connected with the buckle grooves of the pole via the buckle bosses.

[0008] The side plate structure 4 is connected to the shell cover integrated structure 1 by welding.

[0009] Preferably, the poles include a positive pole and a negative pole.

[0010] When the battery cell is a one-end terminal lug structure, there is one pole plate 11, the positive pole and the negative pole are distributed on two symmetrical sides of the pole plate 11, and the main shell 12 is a four-sided shell structure.

[0011] When the battery cell has a terminal lug structure at both ends, the pole plate 11 is divided into a positive pole plate and a negative pole plate, the positive pole is located on the positive pole plate, the negative pole is located on the negative pole plate, and the main shell 12 is a three-sided shell structure.

[0012] Preferably, one end of the L-shaped rivet is led out with an L-shaped bend, and the L-shaped bend is located on the inner side of the pole plate 11 close to the core body 3 .

[0013] The number of the buckle grooves is 3 to 5, which are evenly distributed on the plane inside the horizontal direction of the L-shaped bend of the rivet.

[0014] The buckle groove passes through the L-shaped rivet, and the penetration direction is perpendicular to the three major surfaces of the core body. The two side surfaces of the buckle groove are parallel and concave downward. One side surface forms an internal angle of 100 to 135 degrees with the bottom surface, and the other side surface forms an internal angle of 45 to 80 degrees with the bottom surface. The sum of the internal angles of the two side surfaces and the bottom surface is 180 degrees.

[0015] Preferably, the connecting piece 2 is bent at right angles twice to form a welding area and a buckle area, and the length of the connecting area of ​​the connecting piece 2 is the same as the thickness of the L-shaped rivet.

[0016] The current collector of the core 3 is welded to the connecting sheet 2 through a welding area. The length of the welding area is less than the distance from the inner side of the current collector to the edge of the core 3. The length of the welding area is greater than the snap-on area. The difference between the length of the welding area and the snap-on area is the length of the welded connection portion with the current collector of the core 3.

[0017] The number, shape and size of the snap bosses match the snap grooves of the L-shaped rivets. The snap bosses penetrate perpendicularly to the core 3. The surface of the snap bosses close to the connection area forms an internal angle of 45 to 80 degrees with the bottom surface, and the surface away from the connection area forms an internal angle of 100 to 135 degrees with the bottom surface. The sum of the two internal angles is 180 degrees.

[0018] The L-shaped rivet structure cooperates with the connecting piece 2, the snap-on boss of the connecting piece 2 is embedded in the snap-on groove of the L-shaped rivet structure, and the outermost non-groove position of the L-shaped rivet is embedded in the non-snap-on boss area between the connecting area and the snap-on area of ​​the connecting piece 2.

[0019] Preferably, the core body 3 includes 1-4 laminated or wound pole cores, and the pole lugs of the pole cores are welded to the welding area of ​​the connecting sheet 2 by bending at one side.

[0020] Preferably, the side panel structure 4 has the same large surface size and material as the main shell 12, and the side panel structure 4 is connected to the shell cover integrated structure 1 by laser welding.

[0021] Preferably, the pole plate 11 and the main shell 12 are an integrated structure, and the integrated structure is a hexahedral shell lacking a large surface, and the core 3 is placed inside the shell from an open position lacking a large surface.

[0022] Preferably, the main shell 12 is made of aluminum.

[0023] Compared with the prior art, the utility model adopts the above technical solution and has the following technical effects:

[0024] The novel lithium-ion battery provided by the utility model has a reserved position for a large surface in the integrated shell-cover structure, so that the core body can be directly placed into the shell from the open position without the large surface: after the core body and the connecting piece are welded, during the process of placing the core body into the shell, the boss of the connecting piece and the groove of the rivet are directly engaged, thereby reducing the laser welding process, and finally the side panel structure and the integrated shell-cover structure are welded to complete the assembly of the battery cell. During the assembly process of the battery cell, the requirements for manpower and equipment are effectively reduced, the investment cost is reduced, and the efficiency of assembly is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the integrated shell and cover structure of the novel lithium-ion battery embodiment 1 of the utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the connecting piece of the novel lithium-ion battery embodiment of the utility model;

[0027] Figure 3 This is a schematic diagram of the new lithium-ion battery embodiment 1 of the utility model after the core and the connecting piece are welded;

[0028] Figure 4 This is a schematic diagram of the side plate structure of a novel lithium-ion battery embodiment of the utility model;

[0029] Figure 5 This is a schematic diagram of the integrated shell and cover structure of the novel lithium-ion battery embodiment 2 of the present utility model;

[0030] Figure 6 This is a schematic diagram of the new lithium-ion battery embodiment 2 of the utility model after the core and the connecting piece are welded.

[0031] In the figure: 1, shell cover integrated structure; 2, connecting piece; 3, core body; 4, side plate structure; 11, pole plate; 12, main shell; 111A, positive pole; 111B, negative pole; 112A, first L-shaped rivet; 112B, second L-shaped rivet; 112A', first snap groove; 112B', second snap groove; 2A, first connecting piece; 2B, second connecting piece; 21A, first welding area; 21B, second welding area; 22A, first connecting area; 22B, second connecting area; 23A, first snap area; 23B, second snap area; 23A', first snap boss; 23B', second snap boss. DETAILED DESCRIPTION

[0032] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict.

[0033] The utility model discloses a novel lithium-ion battery, which is suitable for a square battery with a terminal ear at one end, and comprises a shell-cover integrated structure 1, a side plate structure 4, a connecting sheet 2 and a core body 3.

[0034] In one embodiment of the present invention, the shell cover integrated structure 1 is composed of a pole plate 11 and a main shell 12, and the pole plate 11 and the main shell 12 are an integrated structure, which is a shell lacking a large surface, and the core 3 is placed inside the shell through the large surface.

[0035] like Figure 1 and Figure 5 As shown, when the battery cell is a one-end terminal lug structure, there is only one pole plate 11, and the positive pole 111A and the negative pole 111B are both on the symmetrical sides of the pole plate 11, and the main shell 12 structure is a four-sided shell structure.

[0036] When the battery cell has a terminal ear structure at both ends, the pole plate is divided into a positive pole plate and a negative pole plate, and the positive pole is located on the positive pole plate, and the negative pole is located on the negative pole plate; the main shell structure is a three-sided shell structure.

[0037] Similar to the conventional cover plate structure, the positive and negative poles 111A and 111B are rivet-type structures, and the rivets of the pole plate 11 close to the inner side of the core 3 are led out into an L-shaped bending structure.

[0038] Specifically, the bending structure of the rivet is located on the inner side of the pole plate 11 close to the core 3 , and after the rivet is led out from the inner side of the pole plate 11 , it is bent by external force or processing so that the rivet is bent into an L shape.

[0039] The first L-shaped rivet 112A and the second L-shaped rivet 112B of the positive pole and the negative pole have 3 to 5 downwardly concave snap grooves on the inner side of the horizontal bending position, which are the first snap groove 112A' and the second snap groove 112B', respectively, and are evenly distributed in the horizontal plane of 112A and 112B.

[0040] In this embodiment, the first snap groove 112A' passes through the first L-shaped rivet 112A, and the second snap groove 112B' passes through the second L-shaped rivet 112B, and the penetration direction is perpendicular to the large surface of the core body 3. At the same time, the other two side surfaces of the groove are parallel and concave downward, but not concave perpendicular to the bottom, but concave at a certain angle. The surface close to the L-shaped right angle is at an angle of 100 to 135° with the bottom, and the surface away from the L-shaped right angle is at an angle of 45 to 80° with the bottom. The sum of the two internal angles is 180°.

[0041] In this embodiment, the main shell 12 and the pole plate 11 are an integrated structure, and the structure is a shell without a large surface. The material of the main shell 12 is the same as that of a traditional aluminum shell.

[0042] The connecting piece 2 includes a welding area, a connecting area and a snap-fit ​​area.

[0043] like Figure 2 and Figure 3 As shown, there are two connecting pieces, namely a first connecting piece 2A and a second connecting piece 2B.

[0044] like Figure 2 and Figure 6 As shown, the welding areas on the connecting piece are the first welding area 21A and the second welding area 21B, the connecting area includes the first connecting area 22A and the second connecting area 22B, the snap-fit ​​area includes the first snap-fit ​​area 23A and the second snap-fit ​​area 23B, and the welding areas 21A and 21B and the snap-fit ​​areas 23A and 23B are formed after the connecting piece 2 is bent at right angles twice.

[0045] In this embodiment, the first welding area 21A and the second welding area 21B weld the current collector of the core 3 and the connecting plate 2 together. The length of the first welding area 21A and the second welding area 21B is smaller than the dimension from the inner side of the current collector to the edge of the core 3. At the same time, the overall length of the welding area is greater than the first snap-fit ​​area 23A and the second snap-fit ​​area 23B, and the length difference is the same as the length of the current collector welding area.

[0046] In this embodiment, the lengths of the first connection region 22A and the second connection region 22B are the same as the thicknesses of the first L-shaped rivet 112A and the second L-shaped rivet 112B of the pole plate 11 .

[0047] In this embodiment, the first snap-in area 23A and the second snap-in area 23B respectively have 3-5 snap-in bosses downward, which are the first snap-in boss 23A' and the second snap-in boss 23B', and the shapes and sizes of the first snap-in boss 23A' and the second snap-in boss 23B' match the first snap-in groove 112A' and the second snap-in groove 112B' of the pole plate 11.

[0048] The first snap-on boss 23A' and the second snap-on boss 23B' penetrate perpendicularly to the core body 3, and the surfaces of the first snap-on boss 23A' and the second snap-on boss 23B' close to the connection area 22A (22B) are at an angle of 45 to 80° with the bottom, while the surfaces away from the connection area are at an angle of 100 to 135° with the bottom, and the sum of the two internal angles is 180°.

[0049] In this embodiment, the L-shaped rivet structure of the pole plate 11 cooperates with the connecting plate, and the first snap-in boss 23A' and the second snap-in boss 23B' of the connecting plate can be respectively embedded in the first snap-in groove 112A' and the second snap-in groove 112B' of the first L-shaped rivet 112A and the second L-shaped rivet 112B, and the outermost non-groove position of the first L-shaped rivet 112A and the second L-shaped rivet 112B can be embedded in the non-boss area of ​​the connection position between the first connection area 22A and the second connection area 22B of the connecting plate and the first snap-in area 23A and the second snap-in area 23B.

[0050] In this embodiment, the core body is composed of 1-4 laminated or wound pole cores, and the pole lugs of the pole core are welded to the first welding area 21A and the second welding area 21B of the connecting sheet by bending one side.

[0051] In this embodiment, the side plate structure is as follows Figure 4 As shown, the side panel structure has the same large surface size and material as the main shell, and the side panel structure 4 can be directly welded to the shell cover integrated structure 1 by laser.

[0052] In summary, in the novel lithium-ion battery of this embodiment, the shell-cover integrated structure is a hexahedral shell, with a large surface reserved, so that the core can be directly placed into the shell from the open position without a large surface, the L-shaped rivet of the cover plate is bent downward to form a structure with a snap groove, and the connecting piece is bent upward to form a structure with a snap boss. After the core and the connecting piece are welded, when the core is placed into the shell, the snap boss of the connecting piece can be directly engaged with the snap groove of the rivet without welding, and finally the side plate structure is welded to the shell-cover integrated structure, thus completing the assembly of the battery cell. Therefore, the laser welding process in the assembly process of the battery cell is reduced, the manpower and equipment requirements are reduced, the investment cost is reduced, and the assembly efficiency is improved.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A new type of lithium-ion battery, the battery cell structure is square, characterized in that: include: The invention relates to an integrated shell and cover structure (1), a connecting piece (2), a core body (3) and a side plate structure (4); the integrated shell and cover structure (1) is composed of a pole plate (11) and a main shell (12); the poles are distributed on the pole plate (11) and have an L-shaped rivet structure; the inner side of the L-shaped rivet includes a plurality of buckle grooves that are concave downward; the connecting piece (2) includes a welding area, a connecting area and a buckle area; the buckle area has a plurality of buckle bosses that match the buckle grooves downward; the connecting piece (2) is buckled and connected to the buckle grooves of the poles through the buckle bosses; and the side plate structure (4) is connected to the integrated shell and cover structure (1) by welding.

2. The novel lithium-ion battery according to claim 1, characterized in that: The pole column comprises a positive pole column and a negative pole column. When the battery cell is a one-end pole lug structure, the pole column plate (11) is one, the positive pole column and the negative pole column are distributed on two symmetrical sides of the pole column plate (11), and the main shell (12) is a four-sided shell structure; when the battery cell is a two-end pole lug structure, the pole column plate (11) is divided into a positive pole column plate and a negative pole column plate, the positive pole column is located on the positive pole column plate, the negative pole column is located on the negative pole column plate, and the main shell (12) is a three-sided shell structure.

3. The novel lithium-ion battery according to claim 1, characterized in that: One end of the L-shaped rivet is led out with an L-shaped bend, the L-shaped bend is located on the inner side of the pole plate (11) close to the core body (3), and the number of the buckle grooves is 3 to 5, which are evenly distributed on the plane inside the horizontal direction of the L-shaped bend of the rivet.

4. The novel lithium-ion battery according to claim 3, characterized in that: The buckle groove passes through the L-shaped rivet, and the penetration direction is perpendicular to the large surface of the core (3). The two side surfaces of the buckle groove are parallel and concave downward. One side surface forms an internal angle of 100 to 135 degrees with the bottom surface, and the other side surface forms an internal angle of 45 to 80 degrees with the bottom surface. The sum of the internal angles of the two side surfaces and the bottom surface is 180 degrees.

5. The novel lithium-ion battery according to claim 1, characterized in that: The connecting piece (2) is bent at right angles twice to form a welding area and a buckle area, and the length of the connecting area of ​​the connecting piece (2) is the same as the thickness of the L-shaped rivet; The current collector of the core (3) is connected to the connecting sheet (2) by welding via a welding area, the length of the welding area is less than the distance from the inner side of the current collector to the edge of the core (3), the length of the welding area is greater than the buckle area, and the difference between the length of the welding area and the buckle area is the length of the welded connection portion with the current collector of the core (3).

6. The novel lithium-ion battery according to claim 5, characterized in that: The number, shape and size of the snap bosses match the snap grooves of the L-shaped rivet. The snap bosses penetrate perpendicularly to the core (3). The surface of the snap bosses close to the connection area forms an internal angle of 45 to 80 degrees with the bottom surface, and the surface away from the connection area forms an internal angle of 100 to 135 degrees with the bottom surface. The sum of the two internal angles is 180 degrees.

7. The novel lithium-ion battery according to claim 6, characterized in that: The L-shaped rivet structure cooperates with the connecting piece (2), the snap-on boss of the connecting piece (2) is embedded in the snap-on groove of the L-shaped rivet structure, and the outermost non-groove position of the L-shaped rivet is embedded in the non-snap-on boss area of ​​the connecting area and the snap-on area of ​​the connecting piece (2).

8. The novel lithium-ion battery according to claim 1, characterized in that: The core body (3) comprises 1 to 4 laminated or wound pole cores, and the pole lugs of the pole cores are welded to the welding area of ​​the connecting sheet (2) by bending at one side.

9. The novel lithium-ion battery according to claim 1, characterized in that: The side plate structure (4) has the same large surface size and material as the main shell (12), and the side plate structure (4) is connected to the shell cover integrated structure (1) by laser welding.

10. The novel lithium-ion battery according to claim 1, characterized in that: The pole plate (11) and the main shell (12) are an integrated structure, the integrated structure is a hexahedral shell lacking a large surface, the core (3) is placed inside the shell from an open position lacking a large surface, and the main shell (12) is made of aluminum.

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