Middle cover for storage battery and storage battery

Abstract

The utility model provides a middle cover for a storage battery and the storage battery. The middle cover for the storage battery is arranged on a storage battery body shell of the storage battery, seals an upper opening of the storage battery body shell, and is provided with a middle cover body and a safety valve formed on the middle cover body, the safety valve is provided with a safety valve cylinder and a bottom cylinder part, wherein the safety valve cylinder is provided with an injection flow path penetrating through the middle cover body in the thickness direction of the middle cover body and extends downwards from the inner side surface of the middle cover body, and the bottom cylinder part is used for blocking the end part, located on the inner side of the storage battery body shell, of the safety valve cylinder. And at least one injection port formed in the circumferential side wall of the safety valve cylinder close to the inner side of the storage battery body shell, a stop part is formed on the inner surface of the middle cover body close to the side of the storage battery body shell in a manner of at least facing the part of the safety valve in which the injection port is formed, and at the part of the stop part facing the injection port of the safety valve, the injection port of the safety valve is formed. The maximum interval between the stopping part and the bottom cylinder part of the safety valve is smaller than the opening diameter of the injection port.

Description

Technical Field

[0001] This utility model relates to a battery cover for a storage battery and a storage battery using the battery cover. Background Technology

[0002] As is well known, lead-acid batteries are widely used in energy, transportation, and machinery industries due to their numerous advantages, including safety, durability, wide environmental adaptability, high cost-effectiveness, and ease of use. During the manufacturing process of lead-acid batteries, after assembling the casing, middle cover, and electrode plates, acid is injected into the battery through a safety valve located on the middle cover. For example, Japanese Patent Application Publication No. 2003-45412 discloses a lead-acid battery with a safety valve. To address the problem of diaphragm deformation caused by the injected acid impacting the diaphragm during high-speed injection, a conical portion is provided at the bottom of the safety valve cylinder to change the flow direction of the injected acid; that is, the flow direction of the acid is changed from vertical (axial) to horizontal (radial), thereby avoiding the impact of high-speed flowing acid on the diaphragm.

[0003] While the structure disclosed in Japanese Patent Application Publication No. 2003-45412 considers the potential damage caused by acid injection, during the use of lead-acid batteries, the movement of vehicles and other moving, powered devices equipped with lead-acid batteries can cause bumps, which can lead to acid being stirred up within the battery casing. When this stirred-up acid flows back into the safety valve cylinder through the injection ports on both sides of the conical portion, it can remain inside the safety valve cylinder due to capillary action, damaging the inner wall of the safety valve cylinder and its internal valve core. Therefore, there is room for improvement in this existing safety valve. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a new battery cover and a battery having the battery cover.

[0005] In the first technical solution of this utility model, a middle cover for a storage battery is provided, which is installed on the battery body housing of the storage battery to close the upper opening of the battery body housing. The middle cover for the storage battery has a middle cover body and a safety valve formed in the middle cover body. The safety valve has: a safety valve cylinder having an injection flow path formed through the middle cover body along the thickness direction of the middle cover body and extending downward from the inner surface of the middle cover body; a bottom cylindrical portion that seals the end of the safety valve cylinder located inside the battery body housing; and at least one injection port formed on the circumferential side wall of the safety valve cylinder near the inner side of the battery body housing. On the inner surface of the middle cover body near the battery body housing, a stop portion is formed at least facing the portion of the safety valve where the injection port is formed. At the portion where the stop portion and the injection port of the safety valve face each other, the maximum distance between the stop portion and the bottom cylindrical portion of the safety valve is smaller than the opening diameter of the injection port.

[0006] According to the first technical solution, by setting a stop portion and forming a small gap between the stop portion and the bottom cylindrical portion, the backflow of acid in the battery body casing through the injection port can be reduced.

[0007] Based on the first technical solution, in the second technical solution, the stop portion is a plate-shaped part whose radial width is greater than the radial length of the safety valve cylinder. By setting a relatively larger plate-shaped stop portion, not only can the structure be simplified, but a better stopping effect against acid backflow can also be achieved.

[0008] Based on the second technical solution, in the third technical solution, the stop portion is flat and inclined at an angle of 85° to 75° relative to the radial direction of the safety valve cylinder at the center of the injection port. By making the stop portion flat and inclined relative to the radial direction of the safety valve cylinder at the center of the injection port, on the one hand, the flow direction of the acid can be better guided during acid injection; on the other hand, when the acid is stirred up due to vibration, the stirred-up acid can be guided in the inclined direction, reducing the possibility of acid flowing back to the injection port. Moreover, this plate-shaped and inclined structure of the stop portion provides space for the movable core when molding the battery inner cover, reducing the difficulty of mold design, avoiding the need for undercuts, and improving the mold life.

[0009] Based on the first technical solution, in the fourth technical solution, the portion of the safety valve cylinder near the inner side of the battery housing has: a pair of connecting walls extending from the middle cover body to the bottom cylindrical portion, facing radially upwards on the safety valve cylinder; and in the circumferential direction of the safety valve cylinder, between the pair of connecting walls, a pair of injection ports formed by the inner surface of the middle cover body, the connecting walls, and the bottom cylindrical portion. Thus, a specific safety valve structure is provided.

[0010] Based on the first technical solution, in the fifth technical solution, the end of the stop portion that is closer to the inner side of the battery body housing is closer to the inner side of the battery body housing than the outer bottom surface of the bottom cylindrical portion. By making the stop portion protrude beyond the outer bottom surface of the bottom cylindrical portion, a better effect of preventing acid backflow can be achieved.

[0011] Based on the first technical solution, in the sixth technical solution, a guide portion is formed on the inner bottom surface of the bottom cylindrical portion to change the flow direction of the acid injected along the axial direction of the safety valve cylinder toward the injection port. This allows for better guidance of the acid during injection.

[0012] Based on the sixth technical solution, in the seventh technical solution, the guiding part is in the shape of a conical surface. Using a conical surface to guide the acid solution allows for better flow of the acid.

[0013] Based on the first technical solution, in the eighth technical solution, the interval length between the stop portion and the bottom cylindrical portion of the safety valve, at a position corresponding to the center of the injection port in the circumferential direction of the safety valve, is set as S; the opening width of the injection port in the circumferential direction of the safety valve is set as A; the opening width of the injection port in the axial direction of the safety valve is set as E; the diameter of the bottom cylindrical portion is set as C; the length of the stop portion is set as D; the diameter of the safety valve cylinder is set as B; and the protrusion length of the safety valve into the battery housing is set as F.

[0014] The following relationships must be satisfied: 1) A = (0.6~0.8)×C; 2) B = (1.2~2.0)×C; 3) D = (1.2~1.5)×B; 4) F = E + (0.5~3.0)mm; 5) G = (1.0~1.5)×F; 6) S ≥ 0.6×1 / 2×C.

[0015] Based on the first technical solution, in the ninth technical solution, the safety valve further has a safety valve cylinder protrusion extending from the outer surface of the middle cover body towards the opposite side of the battery body housing. A receiving recess is formed on the outer surface of the middle cover body at a portion corresponding to the safety valve cylinder protrusion, recessed towards the battery body housing side. The safety valve cylinder protrusion does not protrude from the receiving recess. Thus, by receiving the safety valve cylinder protrusion in the receiving recess, accidental damage caused by collisions with the safety valve cylinder protrusion from the outside is avoided.

[0016] This utility model also provides a storage battery having the storage battery cover of the first to ninth technical solutions described above; and a storage battery body housing that cooperates with the storage battery cover.

[0017] According to the present invention, the battery cover and battery are provided with a stop part, which blocks the injection port, thus avoiding the deficiency of the existing structure that prevents acid from flowing back into the safety valve (safety valve cylinder) through the injection port. Attached Figure Description

[0018] Figure 1 A schematic diagram of the battery of this invention being filled with electrolyte is shown, illustrating the basic structure of the battery.

[0019] Figure 2 Figure (C) shows a bottom view of the safety valve section in the battery cover, Figure (A) is a cross-sectional view along line AA in Figure (C), and Figure (B) is a cross-sectional view along line BB in Figure (C). Detailed Implementation

[0020] like Figure 1 As shown, the storage battery involved in this utility model has at least a storage battery body housing 30 and a storage battery inner cover 20 disposed on the storage battery body housing 30 and cooperating with the storage battery body housing 30.

[0021] The battery casing 30 is generally rectangular in shape. Multiple alternating positive plates 35 and negative plates 36 are suspended from the cavity of the battery casing 30 by positive and negative cable suspenders 32 and 31, respectively. A separator 34 is located between the positive and negative plates 35 and 36, separating adjacent plates. Positive terminals 22 and negative terminals 21 are respectively provided on the positive and negative cable suspenders 32 and 31, exposed to the outside of the battery via the battery cover 20.

[0022] In this embodiment, the positive and negative electrode straps 32 and 31 are suspended and supported on the battery housing 30. However, in other embodiments, the positive and negative electrode straps 32 and 31 may also be installed and suspended on the battery cover 20, together with the battery cover 20, towards the battery housing 30. Furthermore, the installation method of the positive and negative electrode straps 32 and 31 is not particularly limited, as long as installation and suspension are possible; it can be a fixed connection structure or a movable connection structure. In addition, the installation of the positive and negative electrode plates 35 and 36 onto the positive and negative electrode straps 32 and 31 is not particularly limited; it can be a fixed connection or a movable connection. To avoid collisions between the positive and negative electrode plates 35 and 36 and the battery housing 30 due to the shaking (vibration) of the battery itself, it is preferable that the positive and negative electrode plates 35 and 36 are fixed relative to the positive and negative electrode straps 32 and 31, and the positive and negative electrode straps 32 and 31 are fixed relative to the battery housing 30 (or the battery cover 20).

[0023] Furthermore, the way the positive and negative terminals 22 and 21 are exposed to the outside of the battery (specifically, the battery cover 20) is not particularly limited. The exposed parts can be flush with the battery cover 20 or protrude from it. The specific structure can be selected according to the battery's operating environment.

[0024] Furthermore, there are no particular limitations on the specific structure and material selection of the positive and negative plates; they can be selected based on the actual operating conditions of the battery (such as operating voltage, current, and the intended user). The battery acid solution is also not particularly limited and can be selected based on the operating conditions.

[0025] like Figure 1 As shown, the battery cover 20 includes a cover body 27 and a safety valve 28 disposed on the cover body 27 for injecting liquid into the battery.

[0026] The following, combined with Figure 2 The safety valve 28 will be described in detail.

[0027] like Figure 2As shown, the safety valve 29 includes: a safety valve cylinder 282 having an injection flow path 281 extending through the middle cover body 27 along its thickness direction and extending downward from the inner surface of the middle cover body 27; a bottom cylindrical portion 283 that seals the end of the safety valve cylinder 282 located inside the battery housing 30; and two injection ports 285 formed on a circumferential sidewall 284 of the safety valve cylinder 282 near the inner side of the battery housing 30. On both sides of the injection ports 285, a set of connecting walls 287 extending from the middle cover body 20 to the bottom cylindrical portion 283 and facing radially upwards on the safety valve cylinder 282 are formed. In this embodiment, the two injection ports 285 are in a set of radially opposite positions. In this embodiment, a pair of radially opposite connecting walls 287 are provided. In the circumferential direction of the safety valve cylinder 282, a pair of injection ports 285 are each freely located between a pair of connecting walls 287, forming a structure surrounded by the inner surface of the middle cover body 27, the connecting walls 287, and the bottom cylindrical portion 283. In other embodiments, the number of injection ports 285 may be one or more, as long as the function of injecting acid into the battery is met.

[0028] A stop portion 286 is formed on the inner surface of the middle cover body 27 on the side adjacent to the battery body housing 30. The stop portion 286 is correspondingly provided with the injection port 285. That is, in this embodiment, since there are two injection ports 285, there are two stop portions 286 corresponding to the two injection ports 285. Figure 2 As shown in (B) and (C), the stop portion 286 faces the part of the safety valve (specifically, the safety valve cylinder 282) where the injection port 285 is formed. In this way, not only can the acid injected from the injection port 285 be guided, but the backflow of acid that is stirred up inside the battery due to vibration or shaking to the injection port 285 can also be blocked, thereby preventing the backflow of acid.

[0029] At the location where the stop portion 286 and the injection port 285 of the safety valve cylinder 282 face each other, the maximum distance S between the stop portion 286 and the bottom cylindrical portion 283 of the safety valve 28 is less than the opening diameter R of the injection port 285 (in this document, the opening diameter R refers to the diameter of the circumcircle of the opening of the injection port 285).

[0030] like Figure 2As shown, in a preferred structure, the stop portion 286 is plate-shaped, and its radial width D in the safety valve cylinder 282 is larger than its radial length B. This not only simplifies the structure but also achieves better backflow prevention for acid by using a relatively larger stop portion 286. In a further preferred structure, the stop portion 286 is flat and inclined at an angle of 85° to 75° relative to the radial direction of the safety valve cylinder 282 at the center of the injection port 285. By making the stop portion 286 flat and inclined relative to the radial direction of the safety valve cylinder 282 at the center of the injection port 285, on the one hand, the flow direction of the acid can be better guided during acid injection; on the other hand, if the acid is stirred up due to vibration or other reasons, the stirred-up acid can be guided in the inclined direction, reducing the possibility of acid backflow to the injection port. Moreover, the plate-shaped and inclined structure of this stop 286 provides space for the movable core when molding the battery cover 20, reducing the difficulty of mold design, avoiding the need for undercuts and improving the mold life.

[0031] It should be noted that, in this embodiment, a preferred structure of the stop portion 286, namely a flat plate structure, is shown. However, the stop portion 286 can also be formed into a crescent shape or a trapezoidal shape, depending on actual production needs. Furthermore, while the stop portion 286 adopts a flat plate shape in the above embodiment, it is not limited to this; the stop portion 286 can also be an arc shape concentric with the safety valve cylinder 282. The stop portion 286 only needs to be able to block the acid liquid when it is stirred up; its specific shape is not particularly limited.

[0032] As a preferred structure, the end of the stop portion 286 that protrudes from the inner side of the battery housing 30 is closer to the inner side of the battery housing 30 than the outer bottom surface of the bottom cylindrical portion 283. By making the stop portion 286 protrude beyond the outer bottom surface of the bottom cylindrical portion 283, a better effect of preventing acid backflow can be achieved.

[0033] In another preferred configuration, as in the prior art, a guide portion (not shown) of a conical surface can be formed on the inner bottom surface of the bottom cylindrical portion 283 to change the flow direction of the acid injected along the axial direction of the safety valve cylinder 282 toward the injection port. This allows for better guidance of the acid during injection.

[0034] like Figure 2As shown, the safety valve 28 also has a safety valve cylinder protrusion 289 protruding from the outer surface of the middle cover body 20 facing the opposite side of the battery body housing 30. A receiving recess 288 is formed on the outer surface of the middle cover body 20 corresponding to the safety valve cylinder protrusion 289, recessed towards the battery body housing 30. The safety valve cylinder protrusion 289 does not protrude from the receiving recess 288. Thus, by receiving the safety valve cylinder protrusion 289 through the receiving recess 288, accidental damage caused by collisions with the safety valve cylinder protrusion 289 from the outside is avoided.

[0035] Furthermore, as a preferred embodiment, the interval length between the stop portion 286 and the bottom cylindrical portion 283 of the safety valve 28, at a position corresponding to the center of the injection port 285 in the circumferential direction of the safety valve 28, is set as S; the opening width of the injection port 285 in the circumferential direction of the safety valve 28 is set as A; the opening width of the injection port 285 in the axial direction of the safety valve 28 is set as E; the diameter of the bottom cylindrical portion 283 is set as C; the length of the stop portion 286 is set as D; the diameter of the safety valve cylinder 282 is set as B; and the protrusion length of the safety valve 28 into the battery housing 30 is set as F.

[0036] The following relationship must be satisfied:

[0037] 1) A = (0.6 ~ 0.8) × C

[0038] 2) B = (1.2 ~ 2.0) × C

[0039] 3) D = (1.2 ~ 1.5) × B

[0040] 4) F = E + (0.5~3.0) mm

[0041] 5) G = (1.0 ~ 1.5) × F

[0042] 6) S≥0.6×1 / 2×C.

[0043] The battery cover 20 described above can be manufactured by injection molding. Alternatively, a plate-shaped cover body 27 can be injection molded first, and then the stop part 286 can be installed on the cover body 27 by welding or other methods. The specific manufacturing method can be selected according to the production process and capabilities.

[0044] in addition, Figure 1 The diagram illustrates the process of filling a storage battery with acid. For example... Figure 1 As shown, the filling nozzle 41 of the electrolyte filler 40 is inserted into the safety valve 28, thereby filling the battery with acid under pressure.

[0045] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A middle cover for a storage battery, installed on the battery body casing (30) of a storage battery, for closing the upper opening of the battery body casing (30), characterized in that, It has a central cover body (27) and a safety valve (28) formed in the central cover body (27). The safety valve (28) has: an injection flow path (281) formed through the middle cover body (27) along the thickness direction of the middle cover body (27) and extending downward from the inner surface of the middle cover body (27); a bottom cylindrical portion (283) that seals the end of the safety valve cylinder (282) located inside the battery body housing (30); and at least one injection port (285) formed on the circumferential sidewall (284) of the safety valve cylinder (282) on the inner side of the battery body housing (30). On the inner surface of the middle cover body (27) on the side near the battery body housing (30), a stop portion (286) is formed, at least facing the portion of the safety valve (28) where the injection port (285) is formed. At the location where the stop portion (286) and the injection port (285) of the safety valve (28) face each other, the maximum distance between the stop portion (286) and the bottom cylindrical portion (283) of the safety valve (28) is smaller than the opening diameter of the injection port (285).

2. The battery cover according to claim 1, characterized in that, The stop portion (286) is a plate-shaped part whose radial width is greater than the radial length of the safety valve cylinder (282).

3. The battery cover according to claim 2, characterized in that, The stop portion (286) is flat and is inclined in the radial direction relative to the safety valve cylinder (282) at the center of the injection port (285), forming an angle of 85° to 75°.

4. The battery cover according to claim 1, characterized in that, The portion of the safety valve cylinder (282) near the inside of the battery housing (30) has a pair of connecting walls (287) extending from the middle cover body (27) to the bottom cylindrical portion (283) facing radially upwards on the safety valve cylinder (282). In the circumferential direction of the safety valve cylinder (282), between a pair of connecting walls (287), a pair of injection ports (285) are formed, which are surrounded by the inner surface of the middle cover body (27), the connecting walls (287) and the bottom cylindrical portion (283).

5. The battery cover according to claim 1, characterized in that, The end of the stop portion (286) that is closer to the inside of the battery body housing (30) is closer to the inside of the battery body housing (30) than the outer bottom surface of the bottom cylindrical portion (283).

6. The battery cover according to claim 1, characterized in that, A guide portion is formed on the inner bottom surface of the bottom cylindrical portion (283) to change the flow direction of acid injected along the axial direction of the safety valve cylinder (282) toward the injection port (285).

7. The battery cover according to claim 6, characterized in that, The guide portion is conical in shape.

8. The battery cover according to claim 1, characterized in that, Let S be the interval length between the stop portion (286) and the bottom cylindrical portion (283) of the safety valve (28) at a position corresponding to the center of the injection port (285) in the circumferential direction of the safety valve (28); let A be the opening width of the injection port (285) in the circumferential direction of the safety valve (28); let E be the opening width of the injection port (285) in the axial direction of the safety valve (28); let C be the diameter of the bottom cylindrical portion (283); let D be the length of the stop portion (286); let B be the diameter of the safety valve cylinder (282); and let F be the protrusion length of the safety valve (28) into the battery housing (30). The following relationship must be satisfied. 1) A = (0.6 ~ 0.8) × C 2) B = (1.2 ~ 2.0) × C 3) D = (1.2 ~ 1.5) × B 4) F = E + (0.5~3.0) mm 5) G = (1.0 ~ 1.5) × F 6) S≥0.6×1 / 2×C.

9. The battery cover according to claim 1, characterized in that, The safety valve (28) also has a safety valve cylinder protrusion (289) protruding from the outer surface of the middle cover body (27) on the opposite side towards the battery body housing (30). A receiving recess (288) is formed on the outer surface of the middle cover body (27) at a portion corresponding to the safety valve cylinder protrusion (289), which is recessed toward the battery body housing (30). The safety valve cylinder protrusion (289) does not protrude from the receiving recess (288).

10. A storage battery, characterized in that, It has: a battery cover (20) as described in any one of claims 1 to 9; and A battery body housing (30) that mates with the battery cover (20).

Images