US-12626977-B2 - Top cover assembly for battery and battery

US12626977B2US 12626977 B2US12626977 B2US 12626977B2US-12626977-B2

Abstract

The present disclosure discloses a top cover assembly of battery and top cover assembly, the top cover assembly comprising: a top cover having first recess on top surface, the first recess is provided around mounting hole; a terminal post penetrating mounting hole, first end of terminal post is limited to a side of top cover on which a bottom surface is located, second end of terminal post is higher than top surface of top cover; an upper plastic member provided on a side of top cover where top surface thereof is located and surrounding second end of terminal post to be connected to second end of the terminal post, the upper plastic member has a first boss on a bottom surface, the first boss is accommodated in the first recess, the bottom surface of the upper plastic member is connected to the top surface of the top cover.

Inventors

Weidong Xu
Nan Zhang
Yang Tang
Ziqi Yi
Zuyu WU

Assignees

HITHIUM TECH HK LIMITED

Dates

Publication Date: 20260512
Application Date: 20220929
Priority Date: 20211018

Claims (18)

1 . A top cover assembly for a battery, the battery comprising a housing having an opening and a jelly-roll disposed within the housing, the top cover assembly being for closing the opening, wherein the top cover assembly comprises: a top cover, the top cover having at least one mounting hole, the mounting hole extending through the top cover in a thickness direction of the top cover, the top cover having a first recess on a top surface thereof, the first recess being provided around the mounting hole; a terminal post, the terminal post penetrating the mounting hole, a first end of the terminal post being limited to a side of the top cover on which a bottom surface thereof is located, a second end of the terminal post being higher than the top surface of the top cover; and an upper plastic member, the upper plastic member being provided on a side of the top cover on which the top surface is located and surrounding the second end of the terminal post to be connected to the second end of the terminal post, the upper plastic member having a first boss on a bottom surface thereof, the first boss being accommodated in the first recess, the bottom surface of the upper plastic member being located on the top surface of the top cover, wherein: a first convex ring is provided at an outer edge of the first recess, and the first convex ring is provided around the mounting hole, a first concave ring is provided at a position of the first boss of the upper plastic member corresponding to the first convex ring, and the first convex ring is embedded in the first concave ring.
2 . The top cover assembly according to claim 1 , wherein: the top cover assembly further comprises a lower plastic member, the lower plastic member being provided on a side of the top cover on which the bottom surface thereof is located; and the top cover is provided with a second recess on the bottom surface thereof, the second recess is provided around the mounting hole, a second boss matching the second recess is provided at a position of the lower plastic member corresponding to the second recess, and the second boss is accommodated in the second recess.
3 . The top cover assembly according to claim 1 , wherein the first convex ring is provided along an edge of the first recess, and the first convex ring protrudes from the top surface of the top cover.
4 . The top cover assembly according to claim 2 , wherein: the first recess has a rectangular shape; and/or the second recess has a rectangular shape.
5 . The top cover assembly according to claim 2 , wherein an area of a projection of the first recess on the top surface of the top cover is smaller than an area of a projection of the second recess on the top surface of the top cover.
6 . The top cover assembly according to claim 2 , wherein a depth of the first recess is less than a depth of the second recess.
7 . The top cover assembly according to claim 2 , wherein a volume of the first recess is the same as a volume of the second recess, and the volume of the first recess is a volume of a cavity enclosed by the first recess; and a volume of the second recess is a volume of a cavity enclosed by the second recess.
8 . The top cover assembly according to claim 1 , wherein: the top cover has two mounting holes, and the two mounting holes are located at two ends of the top cover and are symmetrically located with respect to a centerline of the top cover.
9 . The top cover assembly according to claim 8 , wherein: the top cover is further provided with a liquid injection hole extending through the top cover in the thickness direction of the top cover, and the liquid injection hole is located between the two mounting holes and is offset from the centerline of the top cover.
10 . The top cover assembly according to claim 9 , wherein: the top cover is further provided with an explosion-proof through hole extending through the top cover in the thickness direction of the top cover, and the explosion-proof through hole is located between the two mounting holes and located on the centerline of the top cover.
11 . The top cover assembly according to claim 10 , wherein a sum of areas of the mounting hole, the liquid injection hole and the explosion-proof through hole is S1, and a total area of the top cover is S, 0<S1/S≤0.2.
12 . The top cover assembly according to claim 2 , wherein an inner edge of the first recess and an inner edge of the second recess are both connected to a hole edge of the mounting hole.
13 . The top cover assembly according to claim 1 , wherein the upper plastic member is connected to the second end of the terminal post by a snap-fit structure, the snap-fit structure comprising a snap slot and a snap protrusion that cooperate with each other, the snap slot being provided on one of the upper plastic member and the second end of the terminal post, and the snap protrusion being provided on the other of the second end of the terminal post and the upper plastic member.
14 . The top cover assembly according to claim 13 , wherein the snap-fit structure is located at least partially within the mounting hole.
15 . The top cover assembly according to claim 2 , wherein: the top cover assembly further comprises a sealing member, the top cover, the upper plastic member, the terminal post and the lower plastic member jointly form an accommodating cavity for accommodating the sealing member, and the sealing member is disposed in the accommodating cavity.
16 . The top cover assembly according to claim 15 , wherein a portion of the sealing member is embedded between an inner surface of the mounting hole and an outer surface of the terminal post.
17 . The top cover assembly according to claim 16 , wherein another portion of the sealing member is embedded between the second recess and the first end of the terminal post.
18 . A battery comprising the top cover assembly according to claim 1 .

Description

FIELD The present disclosure relates to the field of batteries, and in particular, to a top cover assembly for battery and a battery. BACKGROUND Batteries are used in a variety of applications as a device for storing electrical energy. For example, for streetlights powered by photovoltaic systems, batteries are usually needed to store the electricity generated by the photovoltaic system during the day for use at night, so the battery industry has been developed vigorously in recent years. Usually, the battery includes a top cover assembly, and the top cover assembly includes an upper plastic member and a top cover, and the upper plastic member is disposed on the top surface of the top cover. However, after setting the upper plastic member on the top surface of the top cover, there is often a situation that the connection between the upper plastic member and the top cover is not secure, and there is also a situation that the upper plastic member moves relative to the top cover in the direction parallel to the top surface of the top cover. For this reason, it is necessary to provide a novel top cover assembly and battery to solve the above problem. SUMMARY The present disclosure discloses a top cover assembly for a battery and a battery, which is capable of avoiding the movement of the upper plastic member relative to the top cover in a direction parallel to the top surface of the top cover. To achieve the above objective, in a first aspect, the present disclosure discloses a top cover assembly for a battery, the battery comprising a housing having an opening and a jelly-roll disposed within the housing, the top cover assembly for closing the opening, wherein the top cover assembly comprises: a top cover, the top cover having a mounting hole, the mounting hole extending through the top cover in a thickness direction of the top cover, the top cover having a first recess on a top surface thereof, the first recess being provided around the mounting hole; a terminal post, the terminal post penetrating the mounting hole, a first end of the terminal post being limited to a side of the top cover on which a bottom surface thereof is located, a second end of the terminal post being higher than the top surface of the top cover; an upper plastic member, the upper plastic member being provided on a side of the top cover on which the top surface is located and surrounding the second end of the terminal post to be connected to the second end of the terminal post, the upper plastic member having a first boss on a bottom surface thereof, the first boss being accommodated in the first recess, the bottom surface of the upper plastic member being connected to the top surface of the top cover. Since the terminal post penetrates the mounting hole of the top cover and the first end of the terminal post is limited to a side of the top cover on which the bottom surface thereof is located, the second end of the terminal post is higher than the top surface of the top cover, the upper plastic member is provided on a side of the top cover on which the top surface is located and surrounds the second end of the terminal post to be connected to the second end of the terminal post, and the bottom surface of the upper plastic member is in contact with the top surface of the top cover. Therefore, the top cover will be sandwiched between the upper plastic member and the first end of the terminal post, so that the purpose of assembling the top cover, the terminal post and the upper plastic member of the top cover assembly can be achieved. Due to the fact that the top surface of the top cover is provided with a first recess, the bottom surface of the first recess and the top surface of the top cover form a first step structure, the bottom surface of the upper plastic member is provided with a first boss, and the first boss and the bottom surface of the upper plastic member jointly form a second step structure matched with the first step structure. Therefore, when the upper plastic member is provided on a side of the top cover on which the top surface is located, the first boss can be accommodated in the first recess, in this way, the first recess of the top cover can play the role of positioning the upper plastic member, so that the upper plastic member can be prevented from moving relative to the top cover in the direction parallel to the top surface of the top cover. In addition, since the first boss on the upper plastic member is accommodated in the first recess on the top cover and the bottom surface of the upper plastic member is in contact with the top surface of the top cover, the first contact surface located between the top surface of the first boss and the bottom surface of the first recess and the second contact surface located between the bottom surface of the upper plastic member and the top surface of the top cover will not be coplanar, and in common parlance, the first contact surface and the second contact surface will be high an