Battery cell structure and battery structure

Abstract

The present invention discloses a battery cell structure and a battery structure, belonging to the field of battery technology. The battery cell structure includes a cover plate structure and a battery cell, the cover plate structure includes a cover plate, a positive electrode and a negative electrode, a positive electrode column is provided on the positive electrode, a negative electrode column is provided on the negative electrode, and the positive electrode column and the negative electrode column are directly connected to the battery cell lead-out sheet on the battery cell. The battery cell lead-out part is directly welded to the positive electrode column and the negative electrode column, and the structure of the connecting sheet is cancelled, so that the ultrasonic welding process between the battery cell and the connecting sheet can be omitted, thereby saving the internal space of the battery, increasing the capacity of the battery, saving materials and reducing the manufacturing cost of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery core structure and a battery structure. Background Art

[0002] Lithium-ion battery is a commonly used secondary battery. When assembling lithium-ion batteries, the battery cell and the cover plate need to be separated to prevent the cover plate from directly contacting the battery cell and causing potential safety hazards to the battery.

[0003] Existing battery structures such as Figure 1 As shown, a connecting piece 400 is usually welded to the bottom of the negative electrode column 200 and the positive electrode column 300 on the cover plate 500, and the other end of the connecting piece 400 is ultrasonically welded to the battery cell lead-out sheet 101, so that the battery cell 100 is connected to the positive electrode column 300 and the negative electrode column 200 respectively.

[0004] However, such a structure requires that the connecting piece 400 must be laser welded to the cover plate 500 and ultrasonically welded to the cell lead-out piece 101. This connection method occupies space inside the shell and also requires that the connecting piece 400 be made of metal materials such as copper or aluminum, which wastes materials and increases manufacturing costs. Summary of the invention

[0005] The object of the present invention is to provide a battery cell structure and a battery structure to solve the technical problems existing in the prior art that the battery cell is connected to the positive and negative poles through connecting sheets, which causes material waste, occupies space in the shell and has high costs.

[0006] In order to achieve the above objectives, the following technical solutions are provided:

[0007] The present invention provides a battery cell structure, comprising a cover plate structure and a battery cell, wherein the cover plate structure comprises a cover plate, a positive electrode and a negative electrode, the positive electrode is provided with a positive electrode column, the negative electrode is provided with a negative electrode column, and the positive electrode column and the negative electrode column are both directly connected to the battery cell lead-out sheet on the battery cell.

[0008] Furthermore, a fuse opening is punched on the battery cell lead-out sheet.

[0009] Furthermore, the connection between the battery cell lead-out sheet and the positive electrode column is achieved by laser welding.

[0010] Furthermore, the connection between the battery cell lead-out sheet and the negative electrode column is achieved by laser welding.

[0011] Furthermore, the negative electrode includes a plastic shell, a negative electrode block and the negative electrode column, the plastic shell is arranged between the cover plate and the negative electrode block, one of the cover plate and the plastic shell is provided with a blind hole, and the other is provided with a convex column, the plastic shell and the negative electrode block are provided with a blind hole, and the other is provided with a convex column, and the convex column and the blind hole are matched for positioning.

[0012] Furthermore, the battery cell lead-out sheet comprises a battery cell lead-out sheet body and a plurality of lead-out pins, one end of the battery cell lead-out sheet body is connected to the cover plate, and the other end is connected to the plurality of lead-out pins, and the plurality of lead-out pins are respectively connected to the battery cells.

[0013] Furthermore, the connecting end between the battery cell lead-out piece body and the cover plate, the connecting end between the battery cell lead-out piece body and the lead-out pin, and the edges of the lead-out pin are all provided with chamfers.

[0014] Furthermore, a plurality of the cell lead-out tabs are connected under the positive electrode and the negative electrode, the plurality of cell lead-out tab bodies under the positive electrode are connected to each other through a busbar, and the plurality of cell lead-out tab bodies under the negative electrode are connected to each other through a busbar.

[0015] The present invention also provides a battery structure, comprising the battery cell structure described in any one of the above technical solutions.

[0016] Compared with the prior art, the battery cell structure provided by the present invention includes a cover plate structure and a cell, the cover plate structure includes a cover plate, a positive electrode and a negative electrode, a positive electrode column is provided on the positive electrode, a negative electrode column is provided on the negative electrode, and the positive electrode column and the negative electrode column are directly connected to the cell lead-out sheet on the cell. The cell lead-out sheet is directly welded to the positive electrode column and the negative electrode column, and the structure of the connecting sheet is cancelled, so the ultrasonic welding process between the cell and the connecting sheet can be omitted, saving the internal space of the battery, increasing the capacity of the battery, saving materials and reducing the manufacturing cost of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a battery cell structure in the prior art Figure 1 ;

[0018] Figure 2 A schematic diagram of a battery cell structure in the prior art Figure 2 ;

[0019] Figure 3 The structure of the battery cell structure in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 4 The structure of the battery cell structure in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0021] Figure 5 is a structural schematic diagram of a cover plate structure in an embodiment of the present invention;

[0022] Figure 6 for Figure 5 The cross-sectional view along the AA direction;

[0023] Figure 7 The explosion of the negative electrode part in the cover structure in the embodiment of the present invention Figure 1 ;

[0024] Figure 8 The explosion of the negative electrode part in the cover structure in the embodiment of the present invention Figure 2 ;

[0025] Fig. 9 It is a schematic diagram of the assembly of the cover plate structure and the battery cell lead-out sheet in an embodiment of the present invention;

[0026] Fig.10 The structure of the battery lead-out sheet in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0027] Fig.11 The structure of the battery lead-out sheet in the embodiment of the present invention is shown in FIG. Figure 2 .

[0028] Reference numerals:

[0029] 100-battery cell; 101-battery cell lead-out plate; 200-negative electrode column; 300-positive electrode column; 400-connecting plate; 500-cover plate;

[0030] 1-battery cell; 11-battery cell lead-out plate; 111-battery cell lead-out plate body; 112-lead-out pin; 113-busbar; 114-busbar main plate; 115-chamfer; 2-cover plate; 21-first protruding column; 3-negative electrode; 31-plastic shell; 311-first blind hole; 312-first through hole; 32-negative electrode block; 321-connecting hole; 322-second blind hole; 33-negative electrode column; 4-positive electrode; 5-insulating member. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0032] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0033] like Figure 3 and Figure 4As shown, this embodiment provides a battery cell structure, including a cover plate structure and a battery cell 1, the cover plate structure includes a cover plate 2, a positive electrode 4 and a negative electrode 3, a positive electrode column is provided on the positive electrode 4, a negative electrode column 33 is provided on the negative electrode 3, and the positive electrode column and the negative electrode column 33 are directly connected to the battery cell lead-out sheet 11 on the battery cell 1. The battery cell lead-out sheet 11 is directly welded to the positive electrode column and the negative electrode column 33, and the structure of the connecting sheet is cancelled, so the ultrasonic welding process between the battery cell 1 and the connecting sheet can be omitted, which saves the internal space of the battery, increases the capacity of the battery, saves materials and reduces the manufacturing cost of the battery.

[0034] Specifically, a fuse opening is punched on the battery cell lead-out tab 11 . When a short circuit occurs in the battery, a large current is directly blown at the fuse opening on the battery cell lead-out tab 11 .

[0035] Furthermore, the connection between the battery cell lead-out tab 11 and the positive electrode column and the connection between the battery cell lead-out tab 11 and the negative electrode column 33 are both achieved by laser welding. Laser welding is an efficient and precise welding method that uses a high-energy-density laser beam as a heat source. It can reduce the amount of heat input to the minimum required, the range of metallographic changes in the heat-affected zone is small, and the deformation caused by heat conduction is also minimized.

[0036] Furthermore, if Figure 5-Figure 8 As shown, the negative electrode 3 includes a plastic shell 31, a negative electrode block 32 and a negative electrode column 33. The plastic shell 31 is arranged between the cover plate 2 and the negative electrode block 32. A blind hole is arranged on one of the cover plate 2 and the plastic shell 31, and a convex column is arranged on the other. A blind hole is arranged on one of the plastic shell 31 and the negative electrode block 32, and a convex column is arranged on the other. The convex column and the blind hole are positioned in coordination. The design of the blind hole and the convex column enables the aluminum chips generated by wear on the negative electrode block 32 to be separated by the plastic shell 31 when positioning the cover plate 2, the negative electrode block 32 and the plastic shell 31, and fall on the plastic shell 31, so as not to fall on the cover plate 2, thereby avoiding the problem of short circuit caused by the contact between the aluminum chips and the cover plate 2.

[0037] Among them, Figure 5-Figure 8 As shown, a cavity is provided on the plastic shell 31, and a negative electrode block 32 is arranged in the cavity. A negative electrode column 33 is provided on the cover plate 2, and the negative electrode column 33 is isolated from the cover plate 2 by an insulating member 5. A second through hole is provided on the cover plate 2, and an insulating ring is provided on the inner wall of the second through hole. The negative electrode column 33 is inserted into the second through hole. The bottom end of the negative electrode column 33 is a pressure edge with a diameter larger than the second through hole. The insulating member 5 is a plastic member, and a flange is provided outward at the bottom end of the plastic member, and the flange is inserted between the lower side of the cover plate 2 and the pressure edge. The negative electrode column 33 is connected to the negative electrode block 32. A first through hole 312 is provided on the plastic shell 31. The negative electrode column 33 passes through the first through hole 312 and is connected to the connection hole 321 on the negative electrode block 32 to form the negative electrode 3 of the battery. The positive electrode 4 of the battery is also provided on the cover plate 2, and the positive electrode 4 of the battery and the negative electrode 3 of the battery together constitute the entire battery.

[0038] In this embodiment, Figure 7 and Figure 8 As shown, the cover plate 2 is provided with a first convex column 21, and the first convex column 21 can be made of insulating material, such as ceramic particles, or conductive material. The plastic shell 31 is provided with a first blind hole 311 that cooperates with the first convex column 21, and the hole wall of the first blind hole 311 itself protrudes from the plastic shell 31 to form a second convex column, and the second convex column is a plastic column integrally formed with the plastic shell 31. The negative electrode block 32 is provided with a second blind hole 322 that cooperates with the second convex column. Of course, because the first blind hole 311 on the plastic shell 31 has separated the first convex column 21 from the negative electrode block 32, the second blind hole 322 on the negative electrode block 32 can also be set as a through-hole structure. The cooperation of the first blind hole 311, the first protruding column 21 and the second blind hole 322, in addition to positioning, together with the cooperation between the negative electrode column 33, the first through hole 312 and the connecting hole 321, prevents the relative rotation between the cover plate 2 and the plastic shell 31, and also plays a role in supporting the negative electrode block 32 and the plastic shell 31, and also ensures the insulation between the cover plate 2 and the negative electrode column 33 and the negative electrode block 32, that is, the possibility of short circuit is eliminated when the torque and support are not affected.

[0039] Specifically, in order to play a role in confluence, such as Figure 9-11 As shown, the battery cell lead-out sheet 11 includes a battery cell lead-out sheet body 111 and a plurality of lead pins 112. One end of the battery cell lead-out sheet body 111 is connected to the cover plate 2, and the other end is connected to a plurality of lead pins 112. The plurality of lead pins 112 are respectively connected to the battery cell 1. Chamfers 115 are provided at the connection ends of the battery cell lead-out sheet body 111 and the cover plate 2, the connection ends of the battery cell lead-out sheet body 111 and the lead pins 112, and the edges of the lead pins 112. Because the connection at the chamfer 115 is smooth and not prone to surface scratches, the aluminum shell can be effectively protected and the insulation of the current collector surface can be ensured. This embodiment has a simple structure and does not require the addition of other external components. It only needs to provide chamfers 115 at these corners of the current collector pins to effectively protect the aluminum shell.

[0040] In order to reduce the volume of the cell lead-out sheet 11 as much as possible and to achieve the current collecting effect, each cell lead-out sheet body 111 is connected to two lead pins 112. In order to ensure the stability of the lead pins 112, the free ends of the plurality of lead pins 112 are connected to each other through the busbar 113. In order to ensure that the lead pins 112 do not generate loss leakage, a chamfer 115 is also provided at the connection between the lead pins 112 and the busbar 113. Specifically, in this embodiment, the chamfer 115 is set as a fillet, because the fillet has good smoothness, and the radius of the fillet ranges from 0.1mm to 0.3mm, and the specific fillet radius can be 0.1mm, 0.2mm or 0.3mm. In this embodiment, the radius of the fillet is set to 0.2mm. Since the side (plane part) of the lead pin 112 is connected to each cell 1 through a wire, and the wire is welded to the lead pin 112, if the chamfer 115 is too large, the welding area of ​​the lead pin 112 will be insufficient, and if it is too small, the smoothness will be insufficient. In other embodiments, the chamfer 115 may also be a chamfered C-angle.

[0041] Further, multiple cell lead-out sheets 11 are connected to the bottom of the positive electrode 4 and the bottom of the negative electrode 3. The multiple cell lead-out sheet bodies 111 under the positive electrode 4 are connected to each other through the main busbar 114, and the multiple cell lead-out sheet bodies 111 under the negative electrode 3 are connected to each other through the main busbar 114. Specifically, two cell lead-out sheets 11 are connected to the bottom of the positive electrode 4 and the bottom of the negative electrode 3 of the cover plate 2, respectively. The cell lead-out sheet bodies 111 of the two cell lead-out sheets 11 are connected to a main busbar 114 together. The main busbar 114 is connected to the negative electrode column 33 and the positive electrode column, respectively. The connection between the cell lead-out sheet body 111 and the main busbar 114 is also set to a chamfer 115.

[0042] This embodiment also provides a battery structure, including the above-mentioned battery cell structure.

[0043] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery cell structure, characterized in that: Comprising a cover plate structure and a battery cell (1), the cover plate structure comprising a cover plate (2), a positive electrode (4) and a negative electrode (3), the positive electrode (4) being provided with a positive electrode column, the negative electrode (3) being provided with a negative electrode column (33), the positive electrode column and the negative electrode column (33) being directly connected to a battery cell lead-out sheet (11) on the battery cell (1); The battery cell lead-out sheet (11) comprises a battery cell lead-out sheet body (111) and a plurality of lead-out pins (112); one end of the battery cell lead-out sheet body (111) is connected to the cover plate (2), and the other end is connected to the plurality of lead-out pins (112); the plurality of lead-out pins (112) are respectively connected to the battery cell (1); The connection end between the battery cell lead-out sheet body (111) and the cover plate (2), the connection end between the battery cell lead-out sheet body (111) and the lead pin (112), and the edges of the lead pin (112) are all provided with chamfers (115); The free ends of the plurality of lead pins (112) are interconnected via a busbar (113); the chamfer (115) is also provided at the connection between the lead pins (112) and the busbar (113).

2. The battery cell structure according to claim 1, characterized in that: A fuse opening is punched on the battery cell lead-out piece (11).

3. The battery cell structure according to claim 1, characterized in that: The connection between the battery cell lead-out sheet (11) and the positive electrode column is achieved by laser welding.

4. The battery cell structure according to claim 1, characterized in that: The connection between the battery cell lead-out sheet (11) and the negative electrode column (33) is achieved by laser welding.

5. The battery cell structure according to claim 1, characterized in that: The negative electrode (3) comprises a plastic shell (31), a negative electrode block (32) and the negative electrode column (33); the plastic shell (31) is arranged between the cover plate (2) and the negative electrode block (32); a blind hole is arranged on one of the cover plate (2) and the plastic shell (31), and a convex column is arranged on the other; a blind hole is arranged on one of the plastic shell (31) and the negative electrode block (32), and a convex column is arranged on the other; the convex column and the blind hole are matched for positioning.

6. The battery cell structure according to claim 1, characterized in that: A plurality of the cell lead-out sheets (11) are connected below the positive electrode (4) and below the negative electrode (3); the plurality of cell lead-out sheet bodies (111) below the positive electrode (4) are connected to each other via a busbar (114); and the plurality of cell lead-out sheet bodies (111) below the negative electrode (3) are connected to each other via a busbar (114).

7. A battery structure, characterized in that: A battery cell structure comprising any one of claims 1 to 6.

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