Strip-shaped current collector plate structure for cylindrical battery

Abstract

The utility model provides a kind of cylindrical battery is with bar-shaped current collecting plate structure, it is related to battery technical field.The current collecting plate structure is arranged on the roll core of cylindrical battery, and current collecting plate structure includes: the current collecting plate of strip, camber structure, let go through hole, U-shaped opening and second bending part.The current collecting plate is welded on the roll core of cylindrical battery.Camber structure is arranged in the one end of current collecting plate along its length direction.Let go through hole is arranged on current collecting plate.Let go through hole is matched with the center hole of roll core.U-shaped opening is arranged on current collecting plate.First bending part is arranged in the opening end end of U-shaped opening.Second bending part is arranged between U-shaped opening and the other end end of current collecting plate.The utility model current collecting plate is bent along first bending part and second bending part, so that welding track is symmetrically arranged on the center hole of roll core, and it is through the inner ring to outer ring of all tab of roll core, can ensure the charge-discharge performance of battery, avoid local heating in battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a strip current collector structure for cylindrical batteries. Background Technology

[0002] Currently, lithium-ion / sodium-ion cylindrical batteries are gradually becoming the mainstream product in the new energy industry due to their advantages such as high energy density, good capacity consistency, and ability to support high-rate charge and discharge. More and more manufacturers are continuously pursuing the optimization of cylindrical battery structure compactness to improve energy density. Common questions:

[0003] 1. Cylindrical power batteries commonly use complex current collector designs and require more metal materials, resulting in higher battery production costs.

[0004] 2. A few manufacturers set the current collector of cylindrical power batteries to a rectangular structure. When laser welding the end near the top cover of the cylindrical battery to the tabs, in order to pull up the top cover in an L-shape for welding, the welding trajectory cannot penetrate from the inner ring to the outer ring of the tabs, resulting in poor charging and discharging performance of the battery, causing localized overheating inside the battery and posing a safety hazard. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a strip current collector structure for cylindrical batteries. The current collector is bent along the first and second bends, so that the welding trajectory is symmetrically arranged on both sides of the center hole of the core and penetrates the inner and outer rings of the full tabs of the core. This can ensure the charging and discharging performance of the battery and avoid localized heating inside the battery.

[0006] The technical solution adopted in this utility model is:

[0007] A strip-shaped current collector structure for a cylindrical battery, the current collector structure being disposed on the core of the cylindrical battery, the current collector structure comprising:

[0008] A strip-shaped current collector is welded to the core of a cylindrical battery.

[0009] An arc-shaped structure is provided at one end of the collector plate along its length;

[0010] A clearance through hole is provided on the collector plate and close to the arc surface structure, and the clearance through hole matches the center hole of the core;

[0011] A U-shaped opening is provided on the collector plate, with the opening end of the U-shaped opening facing the center hole of the winding core;

[0012] The first bend is provided at the opening end of the U-shaped opening;

[0013] The second bend is located between the U-shaped opening and the other end of the collector plate.

[0014] Optionally, the U-shaped opening has two.

[0015] Optionally, the bottom of the U-shaped opening coincides with the edge of the core.

[0016] Optionally, the weld between the collector plate and the core is located on both sides of the clearance through hole, with the weld at one end having a U-shaped opening located inside the U-shaped opening, and the weld on the other side corresponding to the weld located inside the U-shaped opening.

[0017] Optionally, a bending through groove is provided at the second bending portion.

[0018] Optionally, the manifold is made of copper, nickel, or aluminum.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. The welding trajectory of the collector plate and the core is symmetrically arranged on both sides of the central hole of the core. The weld is provided at one end with a U-shaped opening, which extends along the inside of the U-shaped opening. During the welding process, the U-shaped opening can help ensure the length and integrity of the welding trajectory.

[0021] 2. A second bend is made at the end near the other end of the current collector, so that the welding traces symmetrically arranged on both sides of the center hole of the core all run through the inner and outer rings of the full tabs of the core, ensuring the charging and discharging performance of the battery and avoiding the safety risks caused by excessive local temperature rise inside the battery.

[0022] 3. The strip-shaped current collector reduces the manufacturing cost of cylindrical batteries while maintaining the battery's rate charging and discharging performance and safety. It also reduces the weight of cylindrical power batteries, and the lightweight battery pack helps new energy vehicles achieve longer driving range. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the strip current collector for a cylindrical battery.

[0025] Figure 2 A schematic diagram of a bar current collector structure welded onto a core for a cylindrical battery.

[0026] Figure 3This is a schematic diagram of the structure of the strip current collector for a cylindrical battery after bending along the first bend.

[0027] Figure 4 This is a schematic diagram of the structure of a strip current collector for a cylindrical battery after bending along the first and second bends.

[0028] Figure 5 This is a schematic diagram of the cross-sectional structure of a cylindrical battery.

[0029] Figure label:

[0030] 1. Collector plate; 2. Arc-shaped structure; 3. Clearance through hole; 4. U-shaped opening; 5. First bend; 6. Second bend; 7. Bending through groove; 8. Core; 9. Center hole. Detailed Implementation

[0031] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0032] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0037] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0038] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The present invention provides a strip-shaped current collector structure for a cylindrical battery. This current collector structure is disposed on the core 8 of the cylindrical battery. The current collector structure includes: a strip-shaped current collector 1, an arc-shaped structure 2, a clearance through-hole 3, a U-shaped opening 4, and a second bend 6. The current collector 1 is welded to the core 8 of the cylindrical battery. The arc-shaped structure 2 is disposed at one end of the current collector 1 along its length. The clearance through-hole 3 is disposed on the current collector 1 and is close to the arc-shaped structure 2. The clearance through-hole 3 matches the center hole 9 of the core 8. The U-shaped opening 4 is disposed on the current collector 1, with the opening end of the U-shaped opening 4 facing the center hole 9 of the core 8. The first bend 5 is disposed at the opening end of the U-shaped opening 4. The second bend 6 is disposed between the U-shaped opening 4 and the other end of the current collector 1.

[0039] There are two U-shaped openings 4 on the collector plate 1. There are welds on both sides of the clearance through hole 3 of the collector plate 1. The weld at one end with the U-shaped opening 4 is located inside the U-shaped opening 4, and the weld on the other side is correspondingly set to the weld located inside the U-shaped opening 4.

[0040] When installing the current collector plate 1, the thin film on the core 8 of the cylindrical battery is flattened or patted flat for pretreatment. The clearance through hole 3 on the current collector plate 1 is aligned with the center hole 9 of the core 8, and then welded and fixed. After welding and fixing, the current collector plate 1 is bent along the opening end of the U-shaped opening 4, so that the current collector plate 1 forms a first bend 5 along the opening end of the U-shaped opening 4. Then, the current collector plate 1 is folded a second time along the second bend 6, after which the current collector plate 1 partially or completely covers the center hole 9 of the core 8.

[0041] The clearance through-hole 3 on the surface of the collector plate 1 is adapted to the center hole 9 of the core 8, ensuring that the collector plate 1 does not affect the liquid injection production after being welded to the core 8. The opening direction of the U-shaped opening 4 is set towards the clearance through-hole 3. After the collector plate 1 is welded to the core 8, the other end of the collector plate 1 is bent for the first time along the opening end of the U-shaped opening 4. At this time, the collector plate 1 forms an L-shape, which facilitates the welding of the end of the collector plate 1 to the top cover of the cylindrical battery. The welding trajectory of the collector plate 1 and the core 8 is symmetrically arranged on both sides of the center hole 9 of the core 8. The weld seam at one end of the U-shaped opening 4 extends along the inside of the U-shaped opening 4. During the welding process, the U-shaped opening 4 can help ensure the length and integrity of the welding trajectory. Then, a second bend is made near the other end of the collector plate 1.

[0042] After the current collector 1 is welded onto the core 8 and bent twice, the welding trajectory is symmetrically arranged on both sides of the central hole 9 of the core 8, and the welding trajectory completely runs through the inner and outer rings of the core 8. This ensures the charging and discharging performance of the battery and avoids safety hazards caused by localized temperature increases inside the battery.

[0043] The strip-shaped current collector 1 reduces the manufacturing cost of cylindrical batteries while maintaining good charge and discharge performance and safety. It also reduces the weight of cylindrical power batteries, and the lightweight battery pack helps new energy vehicles achieve longer driving range.

[0044] In one embodiment, such as Figure 3 , Figure 4 and Figure 5 As shown, in order to prevent part of the current collector 1 from extending out of the core 8 after bending along the first bend 5, the bottom of the opening of the U-shaped opening 4 is set to coincide with the edge of the cylindrical battery.

[0045] In one embodiment, such as Figure 1 and Figure 4 As shown, a bending groove 7 is provided at the second bending part 6.

[0046] To facilitate folding the collector plate 1 along the second bend 6, bending grooves 7 are provided on both sides near the end of the collector plate 1. The top cover is then folded a second time after being welded using the bending grooves 7.

[0047] In one embodiment, the collector plate 1 is made of copper, nickel, or aluminum to accommodate different diaphragms of the winding core 8.

[0048] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A strip-shaped current collector structure for a cylindrical battery, the current collector structure being disposed on the core of the cylindrical battery, characterized in that, The collector disk structure includes: A strip-shaped current collector is welded to the core of a cylindrical battery. An arc-shaped structure is provided at one end of the collector plate along its length; A clearance through hole is provided on the collector plate and close to the arc surface structure, and the clearance through hole matches the center hole of the core; A U-shaped opening is provided on the collector plate, with the opening end of the U-shaped opening facing the center hole of the winding core; The first bend is provided at the opening end of the U-shaped opening; The second bend is located between the U-shaped opening and the other end of the collector plate.

2. The strip current collector structure for cylindrical batteries according to claim 1, characterized in that, The U-shaped opening has two.

3. The strip current collector structure for cylindrical batteries according to claim 1 or 2, characterized in that, The bottom of the U-shaped opening coincides with the edge of the core.

4. The strip current collector structure for cylindrical batteries according to claim 3, characterized in that, The weld between the collector plate and the core is located on both sides of the clearance through hole. The weld at one end with the U-shaped opening is located inside the U-shaped opening, and the weld on the other side is correspondingly set to the weld located inside the U-shaped opening.

5. The strip current collector structure for cylindrical batteries according to claim 1, characterized in that, A bending through groove is provided at the second bending part.

6. The strip current collector structure for cylindrical batteries according to claim 1, characterized in that, The manifold is made of copper, nickel, or aluminum.

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