Alkaline battery provided with isolation tube protection device

Abstract

The alkaline battery comprises a battery steel shell, an annular positive electrode is coaxially and tightly arranged in the battery steel shell, an isolation tube is coaxially inserted in a center hole of the annular positive electrode, and the top end of the battery steel shell is sealed by a sealing ring; the axial length of the isolation tube is greater than that of the annular positive electrode; an isolation tube protection device is arranged at the shaft end of the annular positive electrode; the isolation pipe protection device is of a hoop structure arranged on the periphery of the isolation pipe in a sleeving mode. And the peripheral wall of the sealing ring is completely wrapped by the hoop structure and the annular positive electrode. By additionally arranging the hoop structure, all-directional and targeted external force protection is formed for the isolation pipe, and the device has the advantages of being good in anti-deformation effect, stable in electrochemical performance and wide in adaptation range.

Description

Technical Field

[0001] This invention relates to the field of batteries, and more particularly to an alkaline battery equipped with an isolation tube protection device. Background Technology

[0002] Alkaline batteries are widely used in civilian and industrial applications such as remote controls, toys, and small electronic devices due to their advantages of low cost, stable discharge, and wide operating temperature range. Their core electrochemical system consists of a positive electrode (usually manganese dioxide), a negative electrode (usually zinc powder), an electrolyte (alkaline solution), and a separator. The separator, as a key functional component, plays two main roles: first, it physically separates the active materials of the positive and negative electrodes, preventing direct contact and short circuits; second, it forms a channel for electrolyte storage and ion migration, ensuring the safety of OH groups during battery discharge. - Effective plasma transport directly affects the battery's capacity release efficiency and cycle stability.

[0003] In the actual production, transportation, and end-use of alkaline batteries, damage to the separator tube caused by external forces (such as drops during handling, compression during storage stacking, and impacts from equipment vibration) is one of the main causes of battery performance failure. The supporting structure of the separator tube is crucial in resisting these external forces. Existing alkaline battery separator tubes are mostly made of a combination of polymer materials such as polyethylene and polypropylene with wood pulp fibers. While possessing a certain degree of alkali resistance and flexibility, the wall thickness of the separator tube is typically controlled between 0.1 and 0.15 mm due to the design requirements for battery miniaturization and lightweighting, resulting in relatively low structural strength. When the battery experiences a free fall from a height of 1.0 m or more or is subjected to lateral compression, the separator tube is prone to localized dents, wrinkles, or even breakage. Such deformation directly disrupts the physical separation between the positive and negative electrodes, leading to short circuits in the active materials, causing instantaneous overheating and electrolyte leakage. Even without a direct short circuit, deformation can block ion migration channels, causing a sudden increase in internal resistance and a sudden drop in discharge voltage, ultimately leading to premature battery failure and, in severe cases, even safety hazards.

[0004] To improve the deformation resistance of isolation tubes, existing technologies mainly employ two improvement paths: (1) Additional restraint is applied to the top of the diaphragm tube by reconstructing the geometry of the lower surface of the sealing ring. However, due to the soft texture of the diaphragm itself, zinc paste may still break its top under transportation or vibration conditions, and the risk of isolation failure is not eliminated; (2) By adding glass fiber, polyvinyl alcohol polymer fiber and other reinforcing fillers to the polymer substrate of the separator, the impact strength of the separator can be improved. However, such modification will increase the material cost, and the introduction of fillers may affect the alkali resistance and liquid absorption performance of the separator, thus reducing the electrochemical performance of the battery. In summary, current protective solutions for alkaline battery separators cannot simultaneously meet the requirements of "resistance to external deformation," "battery electrochemical performance," and "production economics." They still exhibit significant performance shortcomings when dealing with external forces such as drops and compression in real-world scenarios. Therefore, developing a novel protective device that can effectively prevent the separator from deforming under external forces and significantly improve battery drop performance has become a pressing technical problem to be solved in the field of alkaline battery structure optimization. Summary of the Invention

[0005] The purpose of this invention is to provide an alkaline battery equipped with an isolation tube protection device.

[0006] The technical solution to achieve the purpose of this invention is: an alkaline battery with an isolation tube protection device, comprising a battery steel shell, an annular positive electrode coaxially and closely disposed inside the battery steel shell, an isolation tube coaxially inserted into the central hole of the annular positive electrode, and the top of the battery steel shell sealed by a sealing ring; The axial length of the isolation tube is greater than that of the annular positive electrode; The annular positive electrode is provided with an isolation tube protection device at its shaft end; The isolation tube protection device is a ring-shaped structure sleeved on the outer periphery of the isolation tube; the ring-shaped structure, together with the annular positive electrode, completely wraps the outer peripheral wall of the sealing ring.

[0007] The alkaline battery equipped with an isolation tube protection device of the present invention has the following technical advantages: (1) It changes the traditional approach of improving the deformation resistance of the isolation tube by starting with the material. By adding a ring hoop structure to the shaft end of the annular positive electrode, the ring hoop structure is fitted around the outer periphery of the isolation tube and together with the annular positive electrode, it completely wraps the outer peripheral wall of the sealing ring, forming a comprehensive and targeted external force protection for the isolation tube. This prevents the zinc paste from shaking due to external forces such as drops, squeezing, and impacts during battery production, handling, storage, stacking, and end use, thus avoiding local dents, wrinkles, or cracks in the section of the isolation tube exposed at the shaft end of the annular positive electrode. This ensures the integrity of the isolation tube from a structural perspective, thereby significantly improving the drop performance of alkaline batteries. (2) Compared with the traditional approach of improving the deformation resistance of the isolation tube by improving the material, the isolation tube protection device of the present invention can improve the deformation resistance of the isolation tube without changing the wall thickness and basic structure of the isolation tube itself, thus avoiding negative impact on the core electrochemical indicators of the battery. (3) Only the axial height and inner and outer diameter of the isolation tube protection device need to be adjusted to match different specifications of battery products, and the range of compatibility is wide; In summary, this invention provides a protection solution for alkaline battery isolation tubes that offers superior anti-deformation performance, stable electrochemical performance, and wide applicability, solving the core problem of current alkaline battery drop failure and enhancing product market competitiveness.

[0008] Furthermore, the ring structure is preferably located at one end of the annular positive electrode near the sealing ring, which facilitates the installation of the ring structure.

[0009] Furthermore, the two axial ends of the ring structure are respectively in axial contact with the annular positive electrode and the sealing ring, thereby axially limiting the ring structure through the annular positive electrode and the sealing ring.

[0010] Furthermore, the outer edge of the ring structure preferably radially contacts the inner wall of the battery steel shell, thereby radially limiting the ring structure through the battery steel shell.

[0011] Furthermore, the ring structure preferably consists of an annular radial extension sleeved on the isolation tube and an annular axial extension formed by axial bending from its inner edge, saving materials while avoiding affecting the normal installation of the sealing ring. When the bottom surface of the sealing ring corresponding to the annular positive electrode has a downwardly protruding annular protrusion, and the ring structure is located at the axial end of the annular positive electrode near the sealing ring, the annular protrusion, the sealing ring, and the isolation tube together form an annular cavity. In this case, the outer end of the annular vertical portion is preferably inserted into the annular cavity.

[0012] Furthermore, the isolation tube protection device is a rigid insulating component. More preferably, it is a ring-shaped component integrally injection molded from polyolefin thermoplastic. Attached Figure Description

[0013] Figure 1 This is an axial cross-sectional view of the alkaline battery equipped with an isolation tube protection device according to an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of the isolation pipe protection device according to an embodiment of the present invention. Detailed Implementation

[0014] The preferred embodiment of the alkaline battery equipped with an isolation tube protection device of the present invention will be described in detail below with reference to the accompanying drawings.

[0015] Combination Figure 1 and Figure 2 An alkaline battery equipped with an isolation tube protection device includes a battery steel shell 10, an annular positive electrode 20 is coaxially and closely disposed inside the battery steel shell 10, an isolation tube 30 is coaxially inserted into the central hole of the annular positive electrode 20, and the top of the battery steel shell 10 is sealed by a sealing ring 40. The axial length of the isolation tube 30 is greater than that of the annular positive electrode 20; The annular positive electrode 20 is provided with an isolation tube protection device 50 at its shaft end; The isolation tube protection device 50 is a ring-shaped structure sleeved on the outer periphery of the isolation tube; the ring-shaped structure 50, together with the annular positive electrode 20, completely wraps the outer peripheral wall of the sealing ring 30; The ring structure 50 is preferably composed of an annular radial extension 51 sleeved on the isolation tube 30 and an annular axial extension 52 formed by axial bending from its inner edge.

[0016] An alkaline battery with the structure of this invention was manufactured using conventional alkaline battery manufacturing methods, serving as an example. Meanwhile, a conventional alkaline battery (without the isolation tube protection device described in this invention) was used as a comparative example. The alkaline batteries from both examples and the comparative example were tested under different heights and conditions to monitor the voltage drop during the drop. Upon drop, the isolation tube 30 ruptured due to impact, causing leakage of internal zinc paste and resulting in a voltage drop; therefore, the degree of voltage decay was used to characterize the integrity of the isolation tube. The test results are shown in Table 1.

[0017] Table 1

[0018] As shown in the table, under the same drop test conditions, adding a support structure (isolation tube protection device 50) to the outside of the isolation tube 30 of the alkaline battery, and completely wrapping the outer peripheral wall of the sealing ring 40 together with the annular positive electrode 20, reduces the probability of pressure drop after the alkaline battery is subjected to a drop, and delays the number of drops when the first pressure drop occurs. Explanation: This novel isolation tube protection device provides lateral support, protects the stability of the overall structure of the isolation tube 30, and better protects the internal state of the battery when it is subjected to drops and impacts, ensuring battery safety.

[0019] Of course, the structure of the ring structure 50 can be, but is not limited to, the specific structure shown in the figure. For example, the ring structure 50 can also be a cylinder with a uniform cross-section that is fitted around the isolation tube 30.

[0020] Furthermore, such as Figure 1 As shown, the ring structure 50 is preferably located at one axial end of the annular positive electrode 20 near the sealing ring 40, which facilitates the installation of the ring structure 50. Of course, the ring structure 50 can also be located at one axial end of the annular positive electrode 20 away from the sealing ring 40, as long as it satisfies the requirement that "the ring structure 40 and the annular positive electrode 20 together can completely wrap the outer peripheral wall of the sealing ring 40", providing all-round lateral support and protecting the isolation tube 30.

[0021] Furthermore, such as Figure 1As shown, the two axial ends (501, 502) of the ring structure 50 are in axial contact with the annular positive electrode 20 and the sealing ring 40, respectively, and the annular positive electrode 20 and the sealing ring 40 limit the axial movement of the ring structure 50.

[0022] Furthermore, such as Figure 1 As shown, the outer edge 503 of the ring structure 50 preferably radially abuts against the inner wall of the battery steel shell 10, thereby radially limiting the ring structure 50 by the battery steel shell 10. Of course, the outer edge 503 of the ring structure 50 may not radially abut against the inner wall of the battery steel shell 10. For example... Figure 1 As shown, when the bottom surface of the sealing ring 40 corresponding to the annular positive electrode 20 is provided with a downwardly protruding annular protrusion 41, and the ring clamp structure 50 is located at one end of the annular positive electrode 20 near the axial end of the sealing ring 40, the annular protrusion 41, the sealing ring 40, and the isolation tube 30 together form an annular cavity 100, and the outer end of the annular vertical portion 52 is preferably inserted into the annular cavity 100. Of course, the bottom surface of the sealing ring 40 may, but is not limited to, have the protrusion 41.

[0023] The isolation tube protection device 50 is a rigid insulating component, and more preferably, it is a ring-shaped component integrally injection molded from polyolefin thermoplastic (e.g., polypropylene PP, polyethylene PE, polyamide PA, etc.). The material is recyclable, meets environmental protection requirements, and has excellent electrical insulation properties.

[0024] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An alkaline battery equipped with an isolation tube protection device, comprising a battery steel casing, an annular positive electrode coaxially and tightly disposed inside the battery steel casing, an isolation tube coaxially inserted into the central hole of the annular positive electrode, and the top of the battery steel casing sealed by a sealing ring; the axial length of the isolation tube is greater than that of the annular positive electrode; characterized in that: The annular positive electrode is provided with an isolation tube protection device at its shaft end; The isolation tube protection device is a ring-shaped structure sleeved on the outer periphery of the isolation tube; the ring-shaped structure, together with the annular positive electrode, completely wraps the outer peripheral wall of the sealing ring.

2. The alkaline battery with an isolation tube protection device according to claim 1, characterized in that: The ring structure is located at one end of the ring-shaped positive electrode near the sealing ring.

3. The alkaline battery with an isolation tube protection device according to claim 1, characterized in that: The two ends of the ring structure are respectively in axial contact with the annular positive electrode and the sealing ring.

4. The alkaline battery with an isolation tube protection device according to claim 1, characterized in that: The outer edge of the ring structure radially abuts against the inner wall of the battery steel shell.

5. The alkaline battery with an isolation tube protection device according to claim 1, characterized in that: The ring structure consists of an annular radial extension sleeved on the isolation tube and an annular axial extension formed by axial bending from its inner edge.

6. The alkaline battery with an isolation tube protection device according to claim 5, characterized in that: When the bottom surface of the sealing ring corresponding to the annular positive electrode is provided with a downwardly protruding annular protrusion, and the ring hoop structure is located at one end of the annular positive electrode near the axial end of the sealing ring, the annular protrusion, the sealing ring, and the isolation tube together form an annular cavity, and the outer end of the annular vertical part is inserted into the annular cavity.

7. The alkaline battery with an isolation tube protection device according to claim 1, characterized in that: The isolation tube protection device is a rigid insulating component.

8. The alkaline battery with an isolation tube protection device according to claim 7, characterized in that: The isolation tube protection device is a ring-shaped component integrally injection molded from polyolefin thermoplastic plastic.

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