Collecting plate of lithium ion battery

Abstract

The utility model belongs to the technical field of new energy batteries, and particularly relates to a current collecting disc of a lithium ion battery, which comprises a cap and cover plate welding area, a roll core tab welding area, an extension handle and a roll core welding disc, the roll core welding disc is fixedly connected to the right side of the extension handle, and the extension handle is provided with a concave welding area. The cover cap and cover plate welding area is arranged at the top of the extension handle, the roll core tab welding area is arranged at the top of the roll core welding disc, and reinforcing ribs are fixedly connected to the top of the extension handle. The diameters of the liquid guide holes in the current collecting disc are different, when materials are supplied in a clip mode, the extension handle is matched, the positioning effect can be achieved, the current collecting disc is prevented from being misplaced or reversely arranged, and the service life of the current collecting disc is prolonged. The size change of the disc-shaped part and the extending handle part of the current collecting disc is large, and the guiding bending opening is designed, so that the bending position can be effectively controlled not to deviate.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, in particular to a current collector plate for lithium-ion batteries, which can be used to connect the winding core with the positive and negative electrodes of the battery inside the battery and transmit current. Background Technique

[0002] The current collector plate is a part of the main structural components of the battery. Its main function is to collect the current from the tab of the winding core and connect the positive and negative electrodes of the battery. In the manufacturing process of the battery, the existing current collector plates are mostly strip-shaped structures. When welding, the welding wires are unevenly distributed in the circumferential direction, the unwelded length of the winding core is relatively large, and the current collection ability is weak. Moreover, most of the bending positions on the existing current collector plates in the industry are not fixed, and there are only stiffeners in the length direction at the extension handle part. During the bending process, the bending positions will shift left and right, posing a risk of contact wall short circuit. At the same time, due to the absence of a pre-bent C port, the current collector plate is not easy to bend, and the formed arc angle at the bending position is relatively large, which will squeeze the winding core, posing a risk of winding core short circuit. Therefore, we propose a current collector plate for lithium-ion batteries to solve the above-mentioned problems. Content of the Utility Model

[0003] Based on the technical problems existing in the background technique, the present utility model proposes a current collector plate for lithium-ion batteries.

[0004] In order to achieve the above object, the present utility model adopts the following technical solutions:

[0005] A current collector plate for lithium-ion batteries, comprising

[0006] a cap and cover plate welding area, a winding core tab welding area, and an extension handle and winding core welding plate. The winding core welding plate is fixedly connected to the right side of the extension handle. The extension handle is provided with a concave welding area. The cap and cover plate welding area is arranged at the top of the extension handle. The winding core tab welding area is arranged at the top of the winding core welding plate. A stiffener is fixedly connected to the top of the extension handle.

[0007] As a preferred solution of the present utility model, the outer wall of the extension handle is provided with a plurality of guiding bending ports.

[0008] As a preferred solution of the present utility model, the extension handle is provided with a plurality of liquid guiding holes.

[0009] As a preferred solution of the present utility model, the stiffener is in the shape of "曰" plus "I". The inner distance L3 of the guiding bending port should not exceed the overall width L4 of the extension handle. The total sum of the cutting amounts (B1, B2) of the two sides of the C port should be less than 1 / 10 of the overall width, that is, L3 = L4 - (B1 + B2), (B1 + B2) ≤ L4 / 10.

[0010] As a preferred solution of the present utility model, the length L1 of the reinforcing rib should be designed not to exceed the distance L3 within the two guiding bending openings, and the lengths (L1, L2) of the reinforcing ribs on both sides of the guiding bending openings should be equal, that is, 7 / 10L4 ≤ L1 = L2 ≤ L3, so as to avoid affecting the structure.

[0011] As a preferred solution of the present utility model, the distances from the reinforcing ribs on the width direction on both sides of the guiding bending openings to the center of the guiding bending openings are equal and exceed the radius of the guiding bending openings, but shall not be greater than 2 times the radius of the guiding bending openings, so as to avoid affecting the bending effect due to the reinforcing ribs or causing an overly large bending fillet, but shall not be greater than 2 times the radius of the guiding bending openings. It is also necessary to avoid being unable to fix the bending position due to an overly long distance.

[0012] As a preferred solution of the present utility model, the extension handle is provided with a central hole, and the diameter of the central hole can be adjusted according to actual situations.

[0013] As a preferred solution of the present utility model, the shape of the liquid guiding hole is circular.

[0014] Beneficial effects:

[0015] 1. The diameters of the liquid guiding holes on this current collector plate are different. When receiving materials in a cartridge form, in cooperation with the extension handle, it can play a positioning role and prevent the current collector plate from being misaligned or reversed.

[0016] 2. The dimensions of the disk-shaped part and the extension handle part of this current collector plate change greatly, and guiding bending openings are designed, which can effectively control the bending position without deviation.

[0017] 3. Multiple reinforcing ribs (in the shape of "曰") are designed on the extension handle of this current collector plate. Even if the material selected for the current collector plate is relatively soft, the structural strength of the extension handle can still be ensured.

[0018] 4. A bending C opening is designed on the extension handle of this current collector plate. By reserving the position of the C opening, the bending position on the extension handle during manufacturing is ensured.

[0019] 5. The welding area between the current collector plate and the core tab uses a sunken structure, which can not only strengthen the structural strength of the disk-shaped structure, but also ensure that the current collector plate and the core tab are in closer contact during welding, enhance the welding effect, and reduce virtual welding.

[0020] 6. Circular holes are reserved in the centers of the positive and negative welding areas of this current collector plate, which is convenient for positioning the extension handle of the current collector plate and the positive and negative electrodes of the battery cell during the manufacturing process.

[0021] 7. There are two types of reinforcing ribs in the shape of "曰" and "I" at the position of the extension handle of this current collector plate. The width-direction reinforcing ribs in the shape of "曰" and the reinforcing ribs in the shape of "I" cooperate with each other, enabling the extension handle to be bent at a fixed position. Description of the Drawings

[0022] Figure 1 This is a perspective view of the present utility model.

[0023] In the figure: 1, the welding area of the cap and the cover plate; 2, the reinforcing rib; 3, the guiding bending port; 4, the welding area of the core tab; 5, the liquid guiding hole; 6, the extending handle; 7, the core welding disk. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0025] Embodiment

[0026] Refer to Figure 1 , a current collector plate for a lithium-ion battery, comprising

[0027] the welding area 1 of the cap and the cover plate, the welding area 4 of the core tab, the extending handle 6 and the core welding disk 7. The core welding disk 7 is fixedly connected to the right side of the extending handle 6. The extending handle 6 is provided with a concave welding area. The welding area 1 of the cap and the cover plate is arranged at the top of the extending handle 6. The welding area 4 of the core tab is arranged at the top of the core welding disk 7. A reinforcing rib 2 is fixedly connected to the top of the extending handle 6.

[0028] As a preferred solution of the present utility model, the outer wall of the extending handle 6 is provided with a plurality of guiding bending ports 3.

[0029] As a preferred solution of the present utility model, the extending handle 6 is provided with a plurality of liquid guiding holes 5.

[0030] As a preferred solution of the present utility model, the reinforcing rib 2 is in the shape of "曰" plus "I". The inner distance L3 of the guiding bending port 3 should not exceed the overall width L4 of the extending handle 6. The total of the cutting amounts B1 and B2 at the two sides C of the port should be less than 1 / 10 of the overall width, that is, L3 = L4 - B1 + B2, and B1 + B2 ≤ L4 / 10.

[0031] As a preferred solution of the present utility model, the length L1 of the reinforcing rib 2 should be designed not to exceed the inner distance L3 between the two guiding bending ports 3, and the lengths (L1, L2) of the reinforcing rib 2 on both sides of the guiding bending port 3 should be equal, that is, 7 / 10L4 ≤ L1 = L2 ≤ L3, so as to avoid affecting the structure.

[0032] As a preferred embodiment of the present utility model, the reinforcing ribs 2 on both sides of the guiding bending opening 3 in the width direction are equidistant from the center of the guiding bending opening 3 and the distance exceeds the radius of the guiding bending opening 3, but shall not be greater than twice the radius of the guiding bending opening 3, so as to avoid affecting the bending effect due to the reinforcing ribs 2 or causing too large bending fillets, but shall not be greater than twice the radius of the guiding bending opening 3. It is also necessary to avoid being unable to fix the bending position due to too long spacing. That is, the spacing between the reinforcing rib 2L1 on the left side of the guiding bending opening 3 in the width direction and the center of the guiding bending opening 3 is A1, and the spacing between the reinforcing rib 2L2 on the right side of the guiding bending opening 3 in the width direction and the center of the C port is A2, and the radius of the C port is R, then R ≤ A1 = A2 ≤ 2R;

[0033] Taking the 32 steel shell lithium battery as an example, when the radius R of the C port = 1.5 mm, the distance between the two reinforcing ribs 2L1 and 2L2 on the left and right sides of the C port in the width direction should be controlled between 3 mm and 6 mm.

[0034] As a preferred embodiment of the present utility model, the extension handle 6 is provided with a central hole, and the central hole diameter can be adjusted according to actual situations.

[0035] As a preferred embodiment of the present utility model, the shape of the liquid guiding hole 5 is preferably selected as circular. The circular structure is easy to process, has no sharp structure and few burrs. And waist-shaped holes, triangular holes, and irregular holes are also acceptable, subject to the actual ease of processing and meeting the liquid injection conditions.

[0036] The working principle of the present utility model: In actual use, the current collector plate of this type is preferably made of a metal with good electrical conductivity and easy to bend, such as: aluminum, aluminum alloy, copper, copper alloy, etc. For the battery cell using this type of current collector plate, a rolling groove structure is preferably used. The movement of the winding core is controlled by the housing to reserve space for bending the extension handle 6. Positioning is carried out through the central hole in cooperation with the side holes. When in use, the positive and negative current collector plates are welded on the welding area 1 of the cap and the cover plate. When the extension handle 6 is welded to the positive and negative current collector plates, a circular welding track is preferably used to ensure the uniformity of current passing. According to the actual situation, other welding shapes such as linear and radial can also be used. The diameter of the winding core welding plate 7 of this type of current collector plate should be smaller than the diameter of the winding core. The reinforcing rib 2 at the position of the extension handle 6 of this type of current collector plate is designed as a "曰" shape plus an "I" shape. The reinforcing rib 2 in the length direction strengthens the overall structure to avoid deformation of the extension handle 6 during manufacturing. The reinforcing rib 2 in the width direction helps the extension handle 6 to bend at a fixed position. According to actual requirements, the reinforcing rib 2 can be one, two or more, and shapes such as "川" shape, "王" shape, and "门" shape are all acceptable. Taking the 32 steel shell lithium battery as an example, when the radius R of the C port = 1.5 mm, the distance between the two reinforcing ribs L1 and L2 on the left and right sides of the C port in the width direction should be controlled between 3 mm and 6 mm. When in use, the current collector plate is placed in a suitable position and connected to the electrode material and the external circuit to achieve the conduction of electric charges.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A lithium-ion battery current collector plate, characterized by, Including the welding area (1) between the cover and the cover plate, the welding area (4) of the core tab, the extension handle (6) and the core welding disc (7). The core welding disc (7) is fixedly connected to the right side of the extension handle (6). The extension handle (6) is provided with a concave welding area. The welding area (1) between the cover and the cover plate is arranged at the top of the extension handle (6). The welding area (4) of the core tab is arranged at the top of the core welding disc (7). A reinforcing rib (2) is fixedly connected to the top of the extension handle (6).

2. The lithium-ion battery current collector of claim 1, wherein, A plurality of guiding bending openings (3) are provided on the outer wall of the extension handle (6).

3. The lithium-ion battery current collector of claim 1, wherein, A plurality of liquid guiding holes (5) are provided on the extension handle (6).

4. The lithium-ion battery current collector of claim 1, wherein, The reinforcing rib (2) is in the shape of "曰" plus "I". The inner distance L3 of the guiding bending opening (3) does not exceed the overall width L4 of the core welding disc (7). The sum of the cutting amounts (B1, B2) at the two C ports on both sides is less than 1 / 10 of the overall width, that is, L3 = L4 - (B1 + B2), (B1 + B2) ≤ L4 / 10.

5. The lithium-ion battery current collector of claim 1, wherein, The length L1 of the reinforcing rib (2) is designed to be less than the inner distance L3 between the two guiding bending openings (3). And the lengths (L1, L2) of the reinforcing ribs (2) on both sides of the guiding bending opening (3) are equal, that is, 7 / 10L4 ≤ L1 = L2 ≤ L3.

6. The lithium-ion battery current collector of claim 2, wherein, The distances from the reinforcing ribs (2) on both sides of the guiding bending opening (3) in the width direction to the center of the guiding bending opening (3) are equal and exceed the radius of the guiding bending opening (3), and shall not be greater than 2 times the radius of the guiding bending opening (3), and shall not be greater than 2 times the radius of the guiding bending opening (3).

7. The lithium-ion battery current collector of claim 1, wherein, The core welding disc (7) is provided with a central hole.

8. The lithium-ion battery current collector of claim 3, wherein, The shape of the liquid guiding hole (5) is circular.

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