Current collector plate, winding core and cylindrical battery

Abstract

The utility model discloses a cylindrical battery's current collecting disc and roll core and cylindrical battery, wherein the cylindrical battery's current collecting disc includes current collecting disc body, the cover plate connects department and is located the middle part of current collecting disc body, the cover plate connects department and is set up in the column shape, is used for with the cover plate and meets, the open circuit trigger ring, the open circuit trigger ring is set up in the periphery of cover plate connecting portion, in the scheme, the open circuit trigger ring is made of thermoplastic high molecular material, under normal use state, the open circuit trigger ring does not influence the normal connection and current conduction between current collecting disc and cover plate, and when the internal air pressure of electric core is abnormally increased, the open circuit trigger ring expands in volume, and its height exceeds the cover plate connecting portion, and pushes away the contact connection between the cover plate and current collecting disc, thereby realizing the disconnection of circuit, avoiding the continuous charging and discharging process, can prevent the electric core from catching fire, explosion, effectively improves the safety of battery system.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a current collector and core of a cylindrical battery, as well as the cylindrical battery itself. Background Technology

[0002] Currently, cylindrical lithium batteries are gradually shifting from the traditional dual-channel structure to a single-channel structure to further improve energy density. In the traditional dual-channel structure, the positive and negative electrodes are led out from two separate ends, while the single-channel structure usually leads out the tab and current through the same end, which simplifies the structure and improves volume utilization.

[0003] Currently, most single-pass battery cells have their explosion-proof valves located above the cover plate. When excessive gas is generated inside the battery cell due to factors such as cyclic aging or side reactions, leading to an increase in internal gas pressure, the explosion-proof valve can release the pressure. However, since the battery cell still maintains current conduction with the cover plate through the current collector, it may continue to charge and discharge, thus posing serious safety hazards such as fire and explosion. Utility Model Content

[0004] The main purpose of this utility model is to propose a current collector, a winding core, and a cylindrical battery, which aims to solve the problem that existing cylindrical lithium battery cells with a single-pass structure cannot automatically cut off power when the internal pressure rises, posing a safety hazard.

[0005] To achieve the above objectives, this utility model proposes a current collector for a cylindrical battery, comprising: The collecting plate body; The cover plate connecting part is located in the middle of the collector plate body; the cover plate connecting part is columnar and is used to abut against the cover plate; A circuit breaker trigger ring is arranged around the periphery of the cover plate connection portion.

[0006] In some embodiments, the circuit breaker trigger ring is sleeved with the cover plate connection portion.

[0007] In some embodiments, the height of the circuit breaker trigger ring is less than the height of the cover plate connection portion.

[0008] In some embodiments, the height of the circuit breaker trigger coil is h, and the height of the cover plate connection portion is H; wherein, H-0.05≤h≤H.

[0009] In some embodiments, the cover plate connection portion is cylindrical.

[0010] In some embodiments, the diameter of the cover plate connection is D, and the outer diameter of the circuit breaker trigger ring is d; wherein, 1.25D≤d≤1.5D.

[0011] In some embodiments, the diameter of the cover plate connection is D, and the wall thickness of the circuit breaker trigger ring is t; wherein, D / 4≤t≤D / 2.

[0012] In some embodiments, the circuit breaker trigger ring is integrally formed, or is formed by a long strip of circuit breaker trigger ring wrapping around the cover plate connection portion.

[0013] This utility model also proposes a core for a cylindrical battery, the core being provided with tabs, the core also including the current collector of the aforementioned cylindrical battery, the end of the current collector body opposite to the cover plate connection portion being welded to the tabs.

[0014] This utility model also proposes a cylindrical battery, which includes a casing and a cover plate, and also includes the aforementioned cylindrical battery core, wherein the cover plate connecting part is welded to the cover plate.

[0015] In this invention, the circuit-breaking trigger ring is made of thermoplastic polymer material and is arranged around the periphery of the current collector cover plate connection. Under normal use, the circuit-breaking trigger ring does not affect the normal connection and current conduction between the current collector and the cover plate. However, when the internal air pressure of the battery cell rises abnormally, the circuit-breaking trigger ring expands in volume, its height exceeding the cover plate connection, and pushes away the contact connection between the cover plate and the current collector, thereby breaking the circuit and preventing the continued charging and discharging process. This can prevent the battery cell from catching fire or exploding, effectively improving the safety of the battery system. The circuit-breaking trigger ring uses thermoplastic polymer materials, such as styrene elastomers and polyurethane elastomers. These materials are dimensionally stable under normal pressure conditions and have excellent elastic response performance when the air pressure or temperature rises abnormally, enabling structural-level active power-off control without the intervention of electronic detection mechanisms. This invention has a simple structure, low cost, high reliability, high integration, and intrinsic safety, making it suitable for integrated protection schemes of next-generation high-energy-density cylindrical batteries. Attached Figure Description

[0016] Figure 1 This is a top view of the current collector of a cylindrical battery according to the present invention; Figure 2 This is a front view of the current collector of a cylindrical battery according to the present invention; Figure 3 This is a schematic diagram of the internal structure of a cylindrical battery according to the present invention; Explanation of icon numbers: The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0017] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0018] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0019] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0020] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0021] Reference Figures 1 to 2 This utility model proposes a current collector 100 for a cylindrical battery, comprising: The collecting plate body 101; The cover plate connecting part 102 is located in the middle of the collector plate body 101; the cover plate connecting part 102 is columnar and is used to abut against the cover plate. The circuit breaker trigger ring 103 is arranged around the periphery of the cover plate connection part 102.

[0022] In this embodiment, the circuit breaker trigger coil 103 is located around the cover plate connection portion 102 in the middle of the manifold body 101, and is made of thermoplastic polymer material, including styrene elastomers, polyurethane elastomers, etc. This type of material can maintain dimensional stability at room temperature and pressure, but can expand in volume under elevated temperature or pressure conditions.

[0023] In the assembled state of the battery, the cover plate connecting part 102 is used to form a welded connection with the cover plate to ensure current conduction between the current collector and the cell cover plate. The circuit breaker trigger ring 103 and the cover plate connecting part 102 are both located under the cover plate. Under normal working conditions, the height of the circuit breaker trigger ring 103 is not higher than the cover plate connecting part 102, so it will not interfere with normal welding and conductivity, nor will it cause material interference or poor connection.

[0024] When the battery cell generates gas inside due to factors such as cyclic aging, side reactions, or malfunctions during use, causing the internal gas pressure of the casing to rise to a set threshold, the thermoplastic polymer material used in the circuit breaker trigger coil 103 will expand due to pressure or heat, and its height will exceed the cover plate connection part 102, generating a contact thrust with the cover plate, causing the original welded connection to be damaged or peeled off, thereby disconnecting the circuit between the cover plate and the collector plate.

[0025] This structure eliminates the need for additional electronic detection circuits or complex sensing devices. Relying on the material's own response to environmental changes, it can trigger the circuit to disconnect when the air pressure is abnormal, effectively preventing the battery cell from continuing to charge and discharge under abnormal conditions, thereby avoiding serious consequences such as thermal runaway, fire, or even explosion.

[0026] Furthermore, the circuit breaker trigger coil 103 is sleeved with the cover plate connection part 102; the sleeved connection between the circuit breaker trigger coil 103 and the cover plate connection part 102 can achieve a tighter structural fit; this structure simplifies the installation method of the circuit breaker trigger coil 103 and improves assembly efficiency; at the same time, due to the compact structure, it can enhance the effective force of the circuit breaker trigger coil 103 on the cover plate in the expanded state, directly separate the electrical connection between the cover plate connection part 102 and the cover plate, improve the accuracy and reliability of the circuit breaker trigger response, and enhance the power failure protection effect of the battery cell under high voltage abnormal conditions.

[0027] In practical applications, the circuit breaker trigger ring 103 is directly wrapped around the outside of the cover plate connection part 102. Through geometric limiting, snap-fit, press-fit, bonding or welding, it can be quickly positioned during the assembly process to avoid offset, sliding or misalignment, which helps to improve the stability and reliability of the overall assembly.

[0028] Furthermore, the height of the circuit breaker trigger coil 103 is less than the height of the cover plate connection portion 102; when the circuit breaker trigger coil 103 is in its normal state, its height is lower than that of the cover plate connection portion 102, which can prevent it from participating in heating or contacting the welding point when welding the cover plate. This can prevent the thermoplastic material from expanding or deforming prematurely under non-abnormal conditions, ensuring the structural integrity and process compatibility of the entire battery cell.

[0029] Furthermore, the height of the circuit breaker trigger coil 103 is h, and the height of the cover plate connecting part 102 is H; wherein, H-0.05≤h≤H; preferably, H-0.04≤h≤H-0.02; unit: mm.

[0030] By limiting the numerical range of the height h of the circuit breaker trigger ring 103 relative to the height H of the cover plate connection part 102, its relative positional relationship under normal conditions can be precisely controlled. The setting of this height difference ensures that the circuit breaker trigger ring 103 will not interfere with the normal welding process and electrical connection, thereby improving the consistency and yield of battery cell production. At the same time, sufficient structural redundancy is retained so that it has a clear expansion trigger space under abnormal conditions, thereby enhancing the effectiveness and controllability of the power-off behavior.

[0031] Furthermore, the cover plate connecting portion 102 is cylindrical; the cylindrical cover plate connecting portion 102 structure facilitates precise fitting with the corresponding structure of the cylindrical battery cell cover plate, forming a stable and reliable electrical connection. The cylindrical structure also possesses good conductivity uniformity and symmetry, which can improve the stability of current distribution; at the same time, it also facilitates subsequent manufacturing and automated assembly, improves product consistency and processing efficiency, and adapts to the current mainstream cylindrical battery cell structure.

[0032] Furthermore, the diameter of the cover plate connecting part 102 is D, and the outer diameter of the circuit breaking trigger ring 103 is d; wherein, 1.25D≤d≤1.5D.

[0033] By limiting the outer diameter of the circuit breaker trigger ring 103 to between 1.25 and 1.5 times the outer diameter of the cover plate connecting part 102, it can be ensured that the circuit breaker trigger ring 103 completely surrounds the connecting part and reserves sufficient expansion space, avoiding functional failure due to being too small or structural interference due to being too large. This diameter ratio optimizes the controllability of the force applied to the cover plate by the circuit breaker trigger ring 103 in the expanded state, while retaining appropriate structural redundancy, improving its accuracy and consistency during triggering, and helping to ensure that the power failure protection function can be reliably implemented under various batch production errors.

[0034] Furthermore, the diameter of the cover plate connecting part 102 is D, and the wall thickness of the circuit breaker trigger ring 103 is t; wherein, D / 4≤t≤D / 2.

[0035] By setting the wall thickness range of the circuit breaker trigger coil 103, it is possible to ensure that it has sufficient structural strength to maintain molding stability, while maintaining a certain degree of flexibility and response space, which facilitates rapid expansion under abnormal pressure or temperature. This thickness range takes into account both structural strength and response performance, avoiding deformation or damage to the structure under normal conditions due to excessive thinness, and also preventing sluggish or insensitive expansion due to excessive thickness. This improves the reliability of the circuit breaker response and the structural durability, and helps to maintain consistent performance in different application scenarios.

[0036] Furthermore, the circuit breaker trigger ring 103 is integrally formed, or is formed by wrapping a long strip of circuit breaker trigger ring around the cover plate connecting part 102. The circuit breaker trigger coil 103 can be manufactured in one piece; for example, by injection molding, compression molding or molding processes, it can be directly formed into a closed ring structure, avoiding problems such as interface misalignment and structural loosening that may be caused by splicing or winding; the one-piece molding structure can simplify the process flow and improve the efficiency of mass production while ensuring dimensional consistency; at the same time, it avoids the problem of inconsistent response in the material overlap or connection area during the expansion process, and improves the uniformity and reliability of the trigger response.

[0037] In some other embodiments, the circuit breaker trigger coil 103 can also be formed by bending and winding a long strip of material to form a closed structure, which can simplify the manufacturing process, is suitable for extrusion, die cutting, winding and other processes, improve material utilization and easily achieve adaptation to various sizes.

[0038] In some other embodiments, a cylindrical battery core 200 is also proposed. The core 200 is provided with tabs 201 and also includes the aforementioned current collector 100 of the cylindrical battery. One end of the current collector body 101 facing away from the cover plate connection portion 102 is welded to the tabs 201. The welding of the current collector body 101 to the tabs 201 is located on the side facing away from the cover plate connection portion 102, which is used to conduct the current inside the core 200 through the current collector to the cover plate connection portion 102, and finally to the cover plate, realizing the normal current output of the battery cell.

[0039] Reference Figure 3 In some other embodiments, a cylindrical battery 300 is also proposed, which includes a housing 301 and a cover plate 302, and also includes the above-mentioned cylindrical battery core 200, with the cover plate connecting portion 102 welded to the cover plate 302.

[0040] The current collector body 101 is located below the core 200, and the cover plate connecting part 102 is connected to the cover plate 302 by welding to form an external current output path for the battery cell. The circuit breaker trigger coil 103 is located on the periphery of the cover plate connecting part 102. It can expand in volume when the internal gas pressure of the battery rises abnormally, pushing the cover plate connecting part 102 away from the cover plate 302, thereby realizing power failure protection.

[0041] The above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is impossible to exhaustively list all possible implementations here. All obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A current collector for a cylindrical battery, characterized in that, include: The collecting plate body; The cover plate connecting part is located in the middle of the collector plate body; the cover plate connecting part is columnar and is used to abut against the cover plate; A circuit breaker trigger ring is provided around the periphery of the cover plate connection portion; The height of the circuit breaker trigger coil is h, and the height of the cover plate connection is H; wherein, H-0.05≤h≤H.

2. The current collector of the cylindrical battery according to claim 1, characterized in that, The circuit breaker trigger ring is sleeved with the cover plate connection part.

3. The current collector of the cylindrical battery according to claim 2, characterized in that, The height of the circuit breaker trigger ring is less than the height of the cover plate connection.

4. The current collector of the cylindrical battery according to claim 1, characterized in that, The cover plate connection part is cylindrical.

5. The current collector of the cylindrical battery according to claim 4, characterized in that, The diameter of the cover plate connection is D, and the outer diameter of the circuit breaker trigger ring is d; wherein, 1.25D≤d≤1.5D.

6. The current collector of the cylindrical battery according to claim 4, characterized in that, The diameter of the cover plate connection is D, and the wall thickness of the circuit breaker trigger ring is t; wherein, D / 4≤t≤D / 2.

7. The current collector of the cylindrical battery according to claim 2, characterized in that, The circuit breaker trigger ring is integrally formed, or it is formed by wrapping a long strip of circuit breaker trigger ring around the connecting part of the cover plate.

8. A core for a cylindrical battery, the core being provided with tabs, characterized in that, The winding core further includes a current collector of the cylindrical battery as described in any one of claims 1 to 7, wherein the end of the current collector body opposite to the cover plate connection portion is welded to the electrode tab.

9. A cylindrical battery, the cylindrical battery comprising a casing and a cover plate, characterized in that, It also includes the core of the cylindrical battery as described in claim 8, wherein the cover plate connecting portion is welded to the cover plate.

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