Alkali climbing prevention structure of exhaust port of nickel-metal hydride battery

Abstract

The utility model discloses an alkali climbing prevention structure of an exhaust port of a nickel-metal hydride battery, which structurally comprises a shell, the exhaust port arranged on the shell and a safety valve covered outside the exhaust port, a connecting piece is nested in the exhaust port, the connecting piece comprises a buckling piece and a sealing piece, the buckling piece is a hollow pipe body with an upper turnup edge, and the sealing piece is a hollow pipe body with a lower turnup edge. A rubber plug of the safety valve abuts against the upper turnup and seals an inner cavity of the hollow pipe body, the lower end of the hollow pipe body is inserted into the exhaust port and provided with a lower turnup, and the upper turnup and the lower turnup of the buckling piece tightly press the sealing piece on the shell and are insulated and isolated from the shell. According to the utility model, the connecting piece is additionally arranged at the exhaust port to insulate and isolate the exhaust channel from the shell, so that electrolyte condensed on the exhaust channel is prevented from growing to the outer surface of the shell due to electrification, and the electrolyte is prevented from climbing out to the outer surface along the inner surface of the shell through tight fit between the shell and the sealing piece; the nickel-metal hydride battery adopting the structure can effectively prevent the alkali climbing phenomenon, and has longer service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of alkaline battery parts, and particularly relates to an anti-alkaline climbing structure of an exhaust port of a nickel-hydrogen battery. Background Art

[0002] Nickel-hydrogen batteries are batteries composed of a NiO positive electrode, a hydrogen storage alloy negative electrode, and a potassium hydroxide solution as an electrolyte. They can be charged and discharged twice and have a wide range of application scenarios. During the use of nickel-hydrogen batteries, the charge reserve will gradually decrease, and the amount of hydrogen evolution at the negative electrode will increase, causing the internal pressure of the battery to increase. This requires that the nickel-hydrogen battery be provided with an exhaust port and a safety valve covering it on the outer shell so that the internal pressure of the battery can be released in time. During the release of the internal pressure, part of the steam formed by the electrolyte due to heat will be released together and condensed at the exhaust port and the outer shell near it. The existing nickel-hydrogen battery exhaust port is usually set by directly punching a hole in the outer shell. Since the exhaust port is directly part of the outer shell, and the outer shell is usually used as a negative electrode, that is, there is a voltage difference between it and the electrolyte, the potassium hydroxide crystals in the electrolyte condensed at the exhaust port will precipitate and grow along the outer shell along the electric potential field, and climb to the outer surface of the battery shell through the exhaust port, forming an alkali climbing phenomenon. Battery alkali creep will accelerate the self-discharge rate of the positive and negative electrodes and other circuits, and reduce the insulation level of the positive and negative electrodes and the DC system of the battery. The electrolyte will also be consumed for no reason, reducing the service life of the battery and affecting the appearance of the battery. Therefore, how to design a battery that can prevent or avoid the occurrence of battery alkali creep while meeting the requirement of timely release of the internal pressure of the battery has become the conception of the invention. Utility Model Content

[0003] The utility model aims to provide an anti-alkali creeping structure for a nickel-hydrogen battery exhaust port, so as to solve the problem that the existing nickel-hydrogen battery exhaust port is charged and causes the alkali creeping phenomenon.

[0004] The utility model is realized by the following technical solutions:

[0005] The utility model proposes an anti-alkali creeping structure of a nickel-hydrogen battery exhaust port, which comprises a shell, an exhaust port opened on the shell, and a safety valve covering and installed outside the exhaust port; a connector is nested in the exhaust port, the connector comprises a buckle and a seal, the buckle is a hollow tube with an upper flange, a rubber plug in the safety valve abuts against the upper flange and closes the inner cavity of the hollow tube, the lower end of the hollow tube is inserted into the exhaust port, the seal is arranged between the shell and the buckle and completely isolates the shell from the buckle;

[0006] Based on the above technical solution, the interior of the battery is connected to the safety valve through a connector nested in the exhaust port. The fastener in the connector acts as an exhaust port to meet the requirement of timely releasing the internal pressure of the battery. The fastener and the charged outer shell are insulated by a seal. The fastener is not charged, and the electrolyte condensed on it will not grow on the outer surface of the outer shell. The fastener compresses the seal on the outer shell, forming a tight fit between the seal and the outer shell, and it is difficult for the electrolyte to be discharged to the outer surface of the outer shell through the gap between the two, which can effectively avoid the occurrence of alkali creep.

[0007] Furthermore, the connection between the upper flange of the fastener and the hollow tube body protrudes upward to form a boss, and the boss conflicts with the rubber plug of the safety valve, so that when the battery needs to release pressure, the deformation requirement of the rubber plug of the safety valve is reduced.

[0008] Furthermore, the exhaust port is a flat hole, and the sealing member is in an I-shaped structure and is nested and wrapped around the exhaust port to improve the insulation reliability between the fastener and the charged housing.

[0009] Furthermore, the lower end of the fastener is bent outward to form a lower flange, and the upper flange and the lower flange tightly press the seal onto the shell, and the edges of the upper flange and the lower flange are located within the edge of the seal. This design can better compact the seal against the inner and outer surfaces of the shell where the exhaust port is opened, extend the sealing length between the seal and the shell, and achieve a better sealing effect.

[0010] Furthermore, the exhaust port is a recessed hole formed by the inward extension of the outer shell, and the seal is correspondingly configured to fit the recessed hole. After assembly, the snap-fitting part presses the seal tightly into the recessed hole. This design has better assembly convenience and is also conducive to better compression of the seal.

[0011] Furthermore, the exhaust port is an upward convex structure formed by the outer shell protruding outward, and the seal and the buckle are also correspondingly arranged as upward convex structures. This design can reduce the deformation requirement of the rubber plug of the safety valve, and can also increase the pressing length of the seal, thereby reducing the probability of electrolyte creeping from the side.

[0012] Furthermore, the sealing member is made of nylon or foam.

[0013] Beneficial Effects

[0014] One of the above technical solutions has the following advantages or beneficial effects:

[0015] 1. In order to solve the alkali creeping phenomenon existing in the exhaust port of the existing nickel-hydrogen battery, an additional connector is provided at the exhaust port to insulate and isolate the fastener and the shell which serve as the exhaust channel, and the seal is tightly pressed onto the shell through the fastener to form a seal, which can prevent the electrolyte condensed on the exhaust channel from growing on the outer surface of the shell due to the electrification of the exhaust channel, and also prevent the electrolyte from creeping out along the inner surface of the shell to the outer surface. At the same time, the requirements of timely releasing the internal pressure of the battery and avoiding the alkali creeping phenomenon of the battery shell are met. The nickel-hydrogen battery using this structure can effectively prevent the occurrence of the alkali creeping phenomenon and has a better service life.

[0016] 2. By setting the exhaust hole as a concave hole, an upward convex structure, or designing the connector as an I-shaped structure, the sealing length between the seal and the shell is effectively extended, reducing the probability of electrolyte creeping out from the contact gap between the two to form alkali creep. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the first embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the third embodiment of the present utility model;

[0021] In the figure: housing 1; exhaust port 11; safety valve 2; rubber plug 21; connector 3; snap-fit ​​member 31; upper flange 311; boss 312; hollow tube 313; lower flange 314; seal 32, battery 100. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the embodiments, but the implementation manner of the present invention is not limited thereto.

[0023] Embodiment 1

[0024] The present embodiment provides an anti-alkali creeping structure of the exhaust port of a nickel-hydrogen battery, the structure of which includes a shell 1 that wraps a battery 100, an exhaust port 11 opened on the shell 1, and a safety valve 2 that covers and is installed outside the exhaust port 11; the exhaust port 11 is a flat hole, and a connector 3 is nested in the exhaust port 11, the connector 3 includes a fastener 31 and a sealing member 32, the fastener 31 is a hollow tube body 313 with an upper flange 311, wherein the hollow tube body 313 is used as an exhaust channel, the rubber plug 21 in the safety valve 2 conflicts with the upper flange 311 and closes the inner cavity of the hollow tube body 313, so as to meet the pressure relief when the internal pressure of the battery increases. Requirement, preferably, the connection between the upper flange 311 and the hollow tube body 313 is raised upward to form a boss 312, and the boss 312 conflicts with the rubber plug 21 of the safety valve 2, so that when the battery needs to release pressure, the deformation requirement of the rubber plug 21 of the safety valve 2 is reduced; the lower end of the hollow tube body 313 is inserted into the exhaust port 11, preferably, the lower end of the hollow tube body 313 of the fastener 31 is bent outward to form a lower flange 314, and the lower flange 314 extends from the exhaust port 11 along the inner surface of the shell 1, and the fastener 31 forms an I-shaped structure; the sealing member 32 also has an I-shaped structure and is nested and wrapped around the exhaust port 11, that is, Figure 1 As shown, the sealing member 32 extends from the exhaust port 11 along the inner and outer surfaces of the shell 1 respectively to form a U-shaped wrapping of the exhaust port 11, and the upper flange 311 and the lower flange 314 of the fastener 31 tightly press the sealing member 32 on the shell 1, ensuring that there is a high pressure seal between the fastener 31 and the shell 1, and extending the sealing length between the sealing member 32 and the shell 1, further preventing the electrolyte from creeping from the contact surface between the sealing member 32 and the shell 1 to the outer surface of the shell 1; the outer edges of the upper flange 311 and the lower flange 314 are located within the outer edge of the sealing member 32, and the shell 1 and the fastener 31 are completely isolated by the sealing member 32, so as to realize the insulation setting of the fastener 31, and effectively prevent the electrolyte from creeping to the shell 1 through the fastener 31.

[0025] Preferably, the aforementioned seal 32 can be made of nylon material with good thermoplasticity and acid and alkali corrosion resistance to ensure that the seal 32 effectively blocks the electrolyte; the seal 32 can also be made of foam material with adjustable compression strength and resistance to high and low temperatures, such as silicone foam, PU foam, etc., to reduce the difficulty of assembling the connector 3 and achieve a sealing effect with a higher pressure, with a higher sealing level, more durability, and better liquid blocking effect.

[0026] Embodiment 2

[0027] This embodiment is one of the preferred solutions of the utility model, and the difference from the first embodiment is that:

[0028] like Figure 2As shown, the exhaust port 11 is a recessed hole formed by the extension of the outer shell 1 inward, and the fastener 31 and the sealing member 32 are also correspondingly configured to fit the recessed hole. The fastener 31 is tightly pressed against the sealing member 32 on the outer surface of the outer shell 1 and the hole wall of the recessed hole to achieve assembly. This structure has good assembly convenience. During assembly, it is only necessary to insert and install the sealing member 32 and the fastener 31 in sequence at the exhaust port 11, and the compression effect of the sealing member 32 and a certain sealing length can be guaranteed.

[0029] Other components not described in this embodiment and the relative positions and connection relationships between the components are the same as those in the first embodiment.

[0030] Embodiment 3

[0031] This embodiment is one of the preferred solutions of the present utility model, and the difference between this embodiment and the first or second embodiment is that:

[0032] like Figure 3 As shown, the exhaust port 11 is an upward convex structure formed by the outer shell 11 protruding upward, and the sealing member 32 and the fastening member 31 are also correspondingly arranged as an upward convex structure. The sealing member 32 can also be designed as a structure that wraps the exhaust port 11 as described in the first embodiment. This design can reduce the process difficulty of forming the exhaust port 11 and the folding process difficulty of the flange 311 on the fastening member 31 on the basis of meeting the requirement of reducing the deformation amount of the rubber plug 21 of the safety valve 2, while ensuring the pressed sealing length of the sealing member 32 and reducing the probability of electrolyte creeping from the side.

[0033] Furthermore, the upper convex structure of the exhaust port 11 can be designed with a wavy structure, and the contact surface between the seal 32 and the exhaust port 11 can also be designed with a wavy structure or made of flexible materials such as foam to improve the sealing strength of the seal 32 and further increase the sealing length.

[0034] Other components not described in this embodiment and the relative positions and connection relationships between the components are the same as those in Embodiment 1 or 2.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the present invention.

Claims

1. An anti-alkali creeping structure for the exhaust port of a nickel-hydrogen battery, comprising a housing, an exhaust port opened on the housing, and a safety valve covering and installed outside the exhaust port; characterized in that: The exhaust port is nested with a connector, which includes a fastener and a sealing member. The fastener is a hollow tube body with an upper flange. The rubber plug in the safety valve contacts the upper flange and closes the inner cavity of the hollow tube body. The lower end of the hollow tube body is inserted into the exhaust port. The sealing member is arranged between the outer shell and the fastener and completely isolates the outer shell from the fastener.

2. The anti-alkali creeping structure of the exhaust port of a nickel-hydrogen battery according to claim 1, characterized in that: The connection between the upper flange of the fastening piece and the hollow tube body protrudes upward to form a boss, and the boss conflicts with the rubber plug of the safety valve.

3. The anti-alkali creeping structure of the exhaust port of a nickel-hydrogen battery according to claim 1, characterized in that: The exhaust port is a flat hole, and the sealing member is in an I-shaped structure and is nested and wrapped around the exhaust port.

4. The anti-alkali creeping structure of the exhaust port of a nickel-hydrogen battery according to claim 3, characterized in that: The lower end of the buckle is bent outward to form a lower flange, and the upper flange and the lower flange tightly press the sealing member onto the shell, and the edges of the upper flange and the lower flange are located within the edge of the sealing member.

5. The anti-alkali creeping structure of the exhaust port of a nickel-hydrogen battery according to claim 1, characterized in that: The exhaust port is a concave hole formed by the inward extension of the shell, and the sealing member is correspondingly configured to fit the concave hole. After assembly, the fastener presses the sealing member tightly into the concave hole.

6. The anti-alkali creeping structure of the exhaust port of a nickel-hydrogen battery according to claim 1, characterized in that: The exhaust port is an upward convex structure formed by the outer shell protruding outward, and the sealing member and the buckling member are also correspondingly configured as upward convex structures.

7. An anti-alkali creeping structure for a nickel-hydrogen battery exhaust port according to any one of claims 1 to 6, characterized in that: The sealing element is made of nylon or foam.

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