Installation structure of plugging cover for battery case

Abstract

The present invention belongs to the field of battery technology, and particularly relates to an installation structure of a plugging cover for a battery shell, comprising a shell and a plugging cover, wherein a cavity extends inward from the bottom of the shell, the plugging cover covers the opening of the cavity, a clamping block is provided on the inner wall of the cavity, a clamping interface corresponding to the position of the clamping block is provided on the plugging cover, and the plugging cover is clamped to the bottom of the shell through the cooperation of the clamping block and the clamping interface. Through the setting of the clamping block and the clamping block, the plugging cover is clamped to the location of the bottom cavity of the shell, and the plugging cover has a good stability when connected to the shell after being clamped, and is not easy to loosen or fall during transportation; a pressure regulating member is used to automatically adjust the internal pressure of the battery, keep the internal pressure of the battery stable, improve the working stability of the battery, and help to ensure the service life of the battery; the pressure regulating member is designed as a breathing structure, which is simple and practical in structure, and is attached to the plugging cover to make full use of the space at the plugging cover.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to an installation structure of a sealing cover for a battery shell. Background Art

[0002] In different scenarios and working conditions, the required structure and performance of lead-acid batteries will be different. In some usage environments, there is a hollow structure inside the shell, which is only used to meet the product's external dimensions. The hollow structure is formed by the bottom of the battery shell extending inward and is not connected to the inside of the battery. Because foreign matter can easily enter and it is not aesthetically pleasing, a blocking structure is required to cover the hollow structure to ensure that no foreign matter remains in the hollow part and to meet the product's appearance requirements.

[0003] like Figure 1 As shown in the figure, it is an existing plugging structure, in which a groove is provided on the inner wall of the hollow structure, and a protrusion is provided on the plugging piece, so that the plugging piece can be plugged in the hollow structure. However, on the one hand, the plugging piece of the plugging structure is not firmly connected to the shell, and the plugging piece is located at the bottom of the shell, and often falls off during transportation, affecting the appearance, and is often loose, affecting the installation flatness and reliability of the shell. Summary of the invention

[0004] The present invention aims at the problem that the blocking piece is easy to loosen in the prior art, and proposes the following technical solution:

[0005] The installation structure of the plugging cover for the battery shell comprises a shell and a plugging cover, wherein the bottom of the shell extends inwardly to form a cavity, and the plugging cover covers the opening of the cavity.

[0006] The inner wall of the cavity is provided with a card block, the blocking cover is provided with a card interface corresponding to the position of the card block, and the blocking cover is connected to the bottom of the shell through the cooperation of the card block and the card interface.

[0007] Among them, the blocking cover includes a cover plate and a connecting part, the cover plate covers the opening of the cavity, the connecting part extends into the cavity, the card interface is arranged in plurality and distributed circumferentially on the side wall of the connecting part, the card block is arranged in plurality correspondingly, and the plurality of card blocks are correspondingly arranged in the card interface.

[0008] The above technical solution, through the setting of the clamping block and the clamping block, enables the blocking cover to be clamped in the bottom cavity of the shell. After the blocking cover is clamped, the connection with the shell is stable and it is not easy to loosen or fall off during transportation.

[0009] As an improvement of the above technical solution, the installation structure of the plugging cover for the battery housing, the connecting part is a hollow cylindrical structure with an inner cavity, the connecting part is provided with a pressure regulating part, the pressure regulating part includes a first tube body, an acid filter plate and a breathing part, the first tube body is arranged in the inner cavity, and one end of the first tube body passes through the shell and extends to the upper part of the electrolyte level, the acid filter plate is arranged at one end of the first tube body extending into the battery, the breathing part is an air storage part, the container of the breathing part changes according to the air pressure, and the breathing part is connected to the other end of the first tube body; the acid filter plate is made of waterproof and breathable material, so that the first tube body and the gas inside the battery can communicate. The breathing part is a container made of elastic material, such as a container made of expanded polytetrafluoroethylene.

[0010] The above technical solution adopts a pressure regulating part to automatically adjust the internal pressure of the battery, maintain the internal pressure of the battery stable, improve the working stability of the battery, and help to ensure the service life of the battery; the pressure regulating part is designed as a breathing structure, which is simple and practical. It is attached to the sealing cover to make full use of the space at the sealing cover.

[0011] As an improvement of the above technical solution, the installation structure of the sealing cover for the battery shell is further provided with an auxiliary explosion-proof component in the inner cavity of the connecting part, and the auxiliary explosion-proof component includes a second tube body, a piston and an elastic member, one end of the second tube body is connected with the breathing part, the piston is slidably arranged in the second tube body, and the piston and the inner wall of the second tube body are sealed, the elastic member is fixed at the other end of the second tube body, and the elastic member is connected to the piston, and an exhaust hole is provided on the second tube body, when the elastic member is in a normal telescopic state, the exhaust hole and the breathing part are respectively located on both sides of the piston, so that the exhaust hole and the breathing part are not connected; when the elastic member is in a set compression state, the exhaust hole and the breathing part are located on the same side of the piston, so that the exhaust hole and the breathing part are connected; a through hole is provided on the cover plate.

[0012] In the above technical solution, when the internal pressure of the battery is too high and it is difficult to avoid the explosion of the battery by relying solely on the pressure regulating component, the auxiliary explosion-proof component plays the role of pressure relief and explosion prevention, and cooperates with the original explosion-proof structure of the battery to reduce the possibility of battery explosion and further improve the safety of battery use.

[0013] The beneficial effects of the present invention are:

[0014] (1) Through the arrangement of the clamping block and the clamping block, the blocking cover is clamped at the bottom cavity of the shell. After the blocking cover is clamped, the connection with the shell is stable and it is not easy to loosen or fall off during transportation;

[0015] (2) A pressure regulating member is used to automatically adjust the internal pressure of the battery, thereby maintaining the internal pressure of the battery stable, improving the working stability of the battery, and helping to ensure the service life of the battery; the pressure regulating member is designed as a breathing structure, which is simple and practical. It is attached to the sealing cover and fully utilizes the space at the sealing cover.

[0016] (3) When the internal pressure of the battery is too high and it is difficult to avoid the explosion of the battery by relying solely on the pressure regulating component, the auxiliary explosion-proof component plays the role of pressure relief and explosion prevention, and cooperates with the original explosion-proof structure of the battery to reduce the possibility of battery explosion and further improve the safety of battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 What is shown is a structural schematic diagram of a blocking structure in the prior art;

[0018] Figure 2 The figure shows a schematic diagram of a mounting structure of a blocking cover for a battery housing as a specific embodiment of the present invention;

[0019] Figure 3 What is shown is a schematic structural diagram of a pressure regulating member as a specific embodiment of the present invention;

[0020] Figure 4 Shown is a schematic structural diagram of an auxiliary explosion-proof component as a specific embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0022] Example 1

[0023] Figure 2 Shown is a schematic structural diagram of a mounting structure of a sealing cover for a battery housing as a specific embodiment of the present invention. Figure 2 In the figure, the installation structure of the plugging cover for the battery shell includes a shell 1 and a plugging cover 2. The bottom of the shell 1 extends inward to form a cavity 11, and the plugging cover 2 covers the opening of the cavity 11; the inner wall of the cavity 11 is provided with a card block 12, and the plugging cover 2 is provided with a card interface 201 corresponding to the position of the card block 12, and the plugging cover 2 is connected to the bottom of the shell 1 through the cooperation of the card block 12 and the card interface 201.

[0024] The above-mentioned cavity 11 is only used to meet the product's external dimension requirements. It is specifically formed by the bottom of the outer shell 1 extending toward the inside of the battery. The cavity 11 is not connected to the inside of the battery. In order to prevent debris from staying in the cavity, the cavity 11 needs to be sealed. The blocking cover 2 in the above-mentioned embodiment 1 blocks the opening of the cavity 11 to achieve the purpose of blocking the cavity 11. When the blocking cover 2 blocks the cavity 11, the blocking cover 2 is clamped at the bottom cavity 11 of the outer shell 1 through the setting of the clamping block 201 and the clamping block 12. After the blocking cover 2 is clamped, the connection with the outer shell 1 is better and it is not easy to loosen or fall off during transportation.

[0025] Among them, Figure 1 As shown, the blocking cover 2 includes a cover plate 21 and a connecting portion 22, the cover plate 21 covers the opening of the cavity 1, the connecting portion 22 extends into the cavity 11, a plurality of the card interfaces 201 are arranged, and are circumferentially distributed on the side walls of the connecting portion 22, a plurality of the card blocks 12 are arranged correspondingly, and the plurality of card blocks 12 are correspondingly carded in the card interface 201.

[0026] Example 2

[0027] Figure 3 Shown is a schematic structural diagram of a pressure regulating component as a specific embodiment of the present invention. Figure 3 In the figure, the connecting part 22 is a hollow cylindrical structure with an inner cavity 221, and a pressure regulating part 3 is arranged on the connecting part 22. The pressure regulating part 3 includes a first tube body 31, an acid filter plate 32 and a breathing part 33. The first tube body 31 is arranged in the inner cavity 221, and one end of the first tube body 31 passes through the shell 1 and extends to the upper part of the electrolyte level. The acid filter plate 32 is arranged at one end of the first tube body 31 extending into the interior of the battery. The breathing part 33 is an air storage part. The container of the breathing part 33 changes according to the air pressure to maintain the air pressure stable. The breathing part 33 is connected to the other end of the first tube body 31.

[0028] The acid filter plate 32 is made of waterproof and breathable material to filter out acidic water vapor in the air entering the first tube body 31 , so that the first tube body 31 and the internal gas of the battery can communicate with each other.

[0029] The inner cavity of the breathing part 33 changes according to the air pressure (when the gas pressure increases, the volume of the breathing part 33 increases, and when the gas pressure decreases, the volume of the breathing part 33 decreases) to keep the air pressure stable. The breathing part 33 is specifically a container with an opening, which itself is made of acid-resistant elastic material, such as expanded polytetrafluoroethylene.

[0030] The pressure regulating component 3 is used to adjust the internal pressure of the battery. The specific adjustment principle is that when the internal pressure of the battery increases, the pressure of the gas entering the breathing part 33 increases, causing the breathing part 33 to expand as a whole, and the internal volume of the breathing part 33 increases, thereby reducing the overall pressure inside the battery. Conversely, the principle is the same. The function of the breathing part 33 is mainly to adjust the internal pressure of the battery when the internal pressure of the battery is relatively high.

[0031] Example 3

[0032] Figure 4 Shown is a schematic structural diagram of an auxiliary explosion-proof component as a specific embodiment of the present invention. Figure 4 In the figure, an auxiliary explosion-proof component 4 is also arranged in the inner cavity 221 of the connecting part 22, and the auxiliary explosion-proof component 4 includes a second tube body 41, a piston 42 and an elastic member 43. One end of the second tube body 41 is connected with the breathing part 33, the piston 42 is slidably arranged in the second tube body 41, and the piston 42 and the inner wall of the second tube body 41 are sealed, the elastic member 43 is fixed at the other end of the second tube body 41, and the elastic member 43 is connected with the piston 42, and an exhaust hole 411 is arranged on the second tube body 41. When the elastic member 43 is in a normal telescopic state, the exhaust hole 411 and the breathing part 33 are respectively located on both sides of the piston 42, so that the exhaust hole 411 and the breathing part 33 are not connected; when the elastic member 43 is in a set compression state, the exhaust hole 411 and the breathing part 33 are located on the same side of the piston 42, so that the exhaust hole 411 and the breathing part 33 are connected.

[0033] The auxiliary explosion-proof component 4 plays a role in pressure relief and explosion prevention when the battery pressure is too high, and cooperates with the original explosion-proof structure of the battery to further improve the safety of battery use. Specifically, when the internal pressure of the battery is normal, the exhaust hole 411 and the breathing part 33 are respectively located on both sides of the piston 42, and the exhaust hole 411 and the breathing part 33 are not connected; when the internal pressure of the battery is too high and there is still a risk of explosion through the adjustment of the breathing part 33, due to the push of the air pressure, the piston 42 moves in the direction away from the breathing part 33, and finally slides through the exhaust hole 411, so that the exhaust hole 411 is connected with the breathing part 33, that is, at this time, the exhaust hole 411 and the gas inside the battery have the same annular shape, and the gas inside the battery enters the exhaust hole 411 through the first tube body 31 and the breathing part 33, and is discharged from the exhaust hole 411, the internal air pressure of the battery is reduced, and the purpose of explosion prevention is achieved. The elastic force of the above-mentioned elastic member, the relative position of the exhaust hole 411 and the piston 42, etc., are obtained through experiments according to the specific battery model.

[0034] When the cover plate 21 and the housing 1 are sealed, a through hole may be provided on the cover plate 21 to allow gas to be discharged smoothly to the outside of the battery.

[0035] The elastic member 43 may be elastic or may be Figure 4As shown, a spring-based elastic damping component.

[0036] Working principle: It is only used to meet the product's external dimension requirements. Specifically, the bottom of the shell 1 extends toward the inside of the battery. The cavity 11 is not connected to the inside of the battery. In order to prevent debris from staying in the cavity, the cavity 11 needs to be blocked. The blocking cover 2 in the above embodiment 1 blocks the opening of the cavity 11 to achieve the purpose of blocking the cavity 11. When the blocking cover 2 blocks the cavity 11, the blocking block 201 and the blocking block 12 are set so that the blocking cover 2 is clamped at the bottom cavity 11 of the shell 1. After the blocking cover 2 is clamped, the connection with the shell 1 is stable and not easy to loosen or fall off during transportation.

[0037] The pressure regulating part 3 is used to adjust the internal pressure of the battery. The specific adjustment principle is that when the internal pressure of the battery increases, the pressure of the gas entering the breathing part 33 increases, causing the breathing part 33 to expand as a whole, and the internal volume of the breathing part 33 increases, so that the overall pressure inside the battery is reduced. Conversely, the principle is the same. The function of the breathing part 33 is mainly to adjust the internal pressure of the battery when the internal pressure of the battery is relatively high.

[0038] The auxiliary explosion-proof component 4 plays a role in pressure relief and explosion prevention when the battery pressure is too high, and cooperates with the original explosion-proof structure of the battery to further improve the safety of battery use. Specifically, when the internal pressure of the battery is normal, the exhaust hole 411 and the breathing part 33 are respectively located on both sides of the piston 42, and the exhaust hole 411 and the breathing part 33 are not connected; when the internal pressure of the battery is too high and there is still a risk of explosion through the adjustment of the breathing part 33, due to the push of the air pressure, the piston 42 moves in the direction away from the breathing part 33, and finally slides through the exhaust hole 411, so that the exhaust hole 411 is connected with the breathing part 33, that is, at this time, the exhaust hole 411 and the gas inside the battery have the same annular shape, and the gas inside the battery enters the exhaust hole 411 through the first tube body 31 and the breathing part 33, and is discharged from the exhaust hole 411, the internal air pressure of the battery is reduced, and the purpose of explosion prevention is achieved. The elastic force of the above-mentioned elastic member, the relative position of the exhaust hole 411 and the piston 42, etc., are obtained through experiments according to the specific battery model.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A mounting structure for a plugging cover for a battery housing, comprising a housing (1) and a plugging cover (2), wherein a cavity (11) extends inwardly from the bottom of the housing (1), and the plugging cover (2) covers the opening of the cavity (11), characterized in that: The inner wall of the cavity (11) is provided with a card block (12), the blocking cover (2) is provided with a card interface (201) corresponding to the position of the card block (12), and the blocking cover (2) is connected to the bottom of the housing (1) through the cooperation of the card block (12) and the card interface (201); The blocking cover (2) comprises a cover plate (21) and a connecting portion (22), the cover plate (21) covers the opening of the cavity (1), the connecting portion (22) extends into the cavity (11), a plurality of the card interfaces (201) are provided and are distributed along the circumference of the connecting portion (22) on the side wall of the connecting portion (22), a plurality of the card blocks (12) are provided correspondingly, and the plurality of card blocks (12) are correspondingly locked in the card interfaces (201); The connecting portion (22) is a hollow cylindrical structure having an inner cavity (221). A pressure regulating member (3) is provided on the connecting portion (22). The pressure regulating member (3) comprises a first tube body (31), an acid filter plate (32) and a breathing portion (33). The first tube body (31) is arranged in the inner cavity (221), and one end of the first tube body (31) passes through the outer shell (1) and extends to the upper part of the electrolyte level. The acid filter plate (32) is arranged at the end of the first tube body (31) extending into the interior of the battery. The breathing portion (33) is an air storage member. The container of the breathing portion (33) changes according to the air pressure. The breathing portion (33) is connected to the other end of the first tube body (31). An auxiliary explosion-proof component (4) is also arranged in the inner cavity (221) of the connecting portion (22), and the auxiliary explosion-proof component (4) comprises a second tube body (41), a piston (42) and an elastic member (43). One end of the second tube body (41) is connected to the breathing portion (33), the piston (42) is slidably arranged in the second tube body (41), and the piston (42) and the inner wall of the second tube body (41) are sealed. The elastic member (43) is fixed to the other end of the second tube body (41), and the elastic member (43) and The second tube body (41) is connected to a piston (42), and an exhaust hole (411) is provided on the second tube body (41). When the elastic member (43) is in a normal telescopic state, the exhaust hole (411) and the breathing portion (33) are respectively located on both sides of the piston (42), so that the exhaust hole (411) and the breathing portion (33) are not connected; when the elastic member (43) is in a set compression state, the exhaust hole (411) and the breathing portion (33) are located on the same side of the piston (42), so that the exhaust hole (411) and the breathing portion (33) are connected.

2. The mounting structure of the sealing cover for the battery case according to claim 1, characterized in that: The acid filter plate (32) is made of a waterproof and breathable material, so that the first tube body (31) and the gas inside the battery are in communication.

3. The mounting structure of the sealing cover for the battery case according to claim 1, characterized in that: The breathing portion (33) is a container made of elastic material.

4. The mounting structure of the sealing cover for the battery case according to claim 1, characterized in that: The breathing part (33) is a container made of expanded polytetrafluoroethylene.

5. The mounting structure of the sealing cover for the battery case according to claim 1, characterized in that: The cover plate (21) is provided with a through hole.

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