CN214898627U - Secondary battery and its top cover structure - Google Patents
Secondary battery and its top cover structure Download PDFInfo
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- CN214898627U CN214898627U CN202120665091.6U CN202120665091U CN214898627U CN 214898627 U CN214898627 U CN 214898627U CN 202120665091 U CN202120665091 U CN 202120665091U CN 214898627 U CN214898627 U CN 214898627U
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- 238000007789 sealing Methods 0.000 claims abstract description 32
- 230000002093 peripheral effect Effects 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 11
- 238000005452 bending Methods 0.000 claims description 9
- 239000004020 conductor Substances 0.000 claims description 5
- 239000011810 insulating material Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 5
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 238000004382 potting Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
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- 239000002210 silicon-based material Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
本实用新型涉及一种二次电池及其顶盖结构。该顶盖结构包括：顶盖片，设有极柱安装孔，包括第一孔和第二孔，第一孔的侧壁与第二孔的侧壁的连接处形成第一台阶面，第一台阶面朝向上方；环形凸出部，凸出于顶盖片的上表面并与顶盖片固定连接，并环绕极柱安装孔设置；极柱件，安装于极柱安装孔，极柱件具有第一表面；上塑胶件，与顶盖片共同包覆环形凸出部的表面；上塑胶件填充于环形凸出部与极柱件之间的间隙并覆盖极柱件的表面；密封圈，垫设在第一表面与第一台阶面之间；以及下塑胶件，与顶盖片的下表面贴合设置。由于密封圈设置在第一表面和第一台阶面之间，能够降低顶盖片、密封圈以及极柱件的连接结构的总厚度，有利于顶盖结构轻薄化。
The utility model relates to a secondary battery and a top cover structure thereof. The top cover structure includes: a top cover sheet with a pole mounting hole, including a first hole and a second hole, a first step surface is formed at the connection between the side wall of the first hole and the side wall of the second hole, and the first The stepped surface faces upward; the annular protruding part protrudes from the upper surface of the top cover sheet and is fixedly connected with the top cover sheet, and is arranged around the pole mounting hole; the pole piece is installed in the pole mounting hole, and the pole piece It has a first surface; an upper plastic part covers the surface of the annular protruding part together with the top cover sheet; the upper plastic part fills the gap between the annular protruding part and the pole piece and covers the surface of the pole piece; a sealing ring , the pad is arranged between the first surface and the first step surface; and the lower plastic part is arranged to fit with the lower surface of the top cover sheet. Since the sealing ring is arranged between the first surface and the first step surface, the total thickness of the connection structure of the top cover sheet, the sealing ring and the pole piece can be reduced, which is beneficial to the lightness and thinning of the top cover structure.
Description
Technical Field
The utility model relates to a battery technology field especially relates to secondary battery and top cap structure thereof.
Background
In modern society, more and more driving power sources for electric tools and new energy vehicles are developed towards high capacity and high safety. Lithium ion batteries are widely used in electric tools due to their excellent characteristics such as high capacity. In addition to the characteristics of long service life and the like, the lithium ion battery has to meet the safety performance standards and meet the requirements of people. Meanwhile, in consideration of the battery capacity, the structure of the cell structural member needs to be optimized.
In a cap structure of a general secondary battery, positive and negative terminals and a cap plate are generally fixed by a riveting structure. And the top cap structure includes sealing washer, insulating plastic, pottery etc. and the subassembly is more, and top cap structure's total thickness is thicker to lead to the whole thickness of electric core to be thicker, be unfavorable for improving the energy density of electric core.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a thin and light top cap structure and a secondary battery having the same, in order to solve the technical problem that the overall thickness of the top cap structure of the conventional secondary battery is thick.
The embodiment of the application provides a top cap structure, includes:
the top cover plate is provided with a pole mounting hole, the pole mounting hole comprises a first hole and a second hole, the inner diameter of the second hole is larger than that of the first hole, a first step surface is formed at the joint of the side wall of the first hole and the side wall of the second hole, and the first step surface faces to a first direction X;
the annular protruding part protrudes out of the upper surface of the top cover plate and is fixedly connected with the top cover plate, and the annular protruding part is arranged around the edge of the pole mounting hole;
a pole post mounted to the pole mounting hole, the pole post having a first surface opposite the first step surface, the first surface facing a second direction Y, the second direction Y being opposite the first direction X;
the upper plastic part and the top cover plate jointly cover the surface of the annular bulge part, so that the annular bulge part is completely covered, and the upper plastic part is filled in a gap between the annular bulge part and the pole column part and covers the surface of the pole column part;
the sealing ring is arranged between the first surface and the first step surface in a cushioning mode; and
and the lower plastic part is attached to the lower surface of the top cover piece and is positioned in the second direction Y of the top cover piece.
In the top cover structure, the pole piece is arranged in the pole mounting hole. The annular projection is disposed around the post member. Go up the surface of plastic part and the common cladding annular bulge of top cap piece, go up the plastic part and fill between annular bulge and utmost point post spare, and go up the plastic part and cover the outer peripheral face of utmost point post spare to can reliably connect utmost point post spare, top cap piece and annular bulge, so that utmost point post spare installs reliably on the top cap piece. Because the sealing washer sets up between first surface and first step face, consequently, need not to extend below the sealing washer with utmost point post spare to can reduce utmost point post spare's overall height, be favorable to the frivolousization of top cap piece. And, first step face is the inner wall of utmost point post mounting hole, and utmost point post mounting hole caves in the upper surface of top cap piece, therefore, first step face is less than the upper surface of top cap piece. Because first step face is less than the upper surface of top cap piece, consequently, set up the sealing washer on first step face, can reduce top cap piece, sealing washer and the total thickness of the connection structure of pole post spare to be favorable to top cap structure's frivolousization.
In one embodiment, the lower end surface of the pole column piece is not lower than the lower end surface of the lower plastic piece.
In an embodiment, the top cover plate is provided with a third hole, the third hole is communicated with the second hole and forms a stepped hole together with the second hole, the inner diameter of the third hole is larger than that of the second hole, a second stepped surface is formed at the joint of the side wall of the third hole and the side wall of the second hole, and the annular protruding portion is arranged on the second stepped surface and matched with the second stepped surface.
In one embodiment, the annular projection comprises:
one end of the annular body is fixedly connected with the top cover plate; and
the annular bending part is fixedly connected with the other end of the annular body, and the annular body and the annular bending part are arranged at an angle.
In one embodiment, the annular protrusion is provided with a plurality of through holes arranged at intervals along the circumferential direction.
In one embodiment, the pole piece comprises: the plastic part comprises a first section and a second section, wherein the second section and the first section are axially arranged and fixedly connected, the outer diameter of the second section is larger than that of the first section and is positioned below the first section, a third step surface is formed at the joint of the outer peripheral surface of the second section and the outer peripheral surface of the first section, and the third step surface is covered by the upper plastic part.
In one embodiment, the third step surface is inclined to the outer peripheral surface of the first section and the outer peripheral surface of the second section; the outer peripheral surface of the first section and the outer peripheral surface of the second section form obtuse angles with the third step surface respectively.
In an embodiment, the sealing washer includes main part circle and protruding circle, protruding circle with main part circle fixed connection and protrusion in the lower surface of main part circle, the external diameter of protruding circle is less than the external diameter of main part circle, the lower surface laminating of main part circle in first step face, the external diameter of protruding circle with the internal diameter looks adaptation in first hole.
In an embodiment, the lower plastic part includes a lower plastic main body and a lower plastic protruding ring, the lower plastic protruding ring is fixedly connected with the lower plastic main body and protrudes out of the upper surface of the lower plastic main body, the upper surface of the lower plastic main body is attached to the lower surface of the top cover plate, and the outer diameter of the lower plastic protruding ring is matched with the inner diameter of the first hole.
In one embodiment, the upper surface of the lower plastic bulge loop is attached to the lower surface of the bulge loop.
In one embodiment, the number of the pole pieces is two, wherein one pole piece is a positive pole piece, and the other pole piece is a negative pole piece;
the number of the pole mounting holes is two, one pole mounting hole is used for mounting the positive pole, and the other pole mounting hole is used for mounting the negative pole;
the number of the annular convex parts, the number of the upper plastic parts and the number of the sealing rings are two respectively; the positive post corresponds to one of the annular bulges, one of the upper plastic parts and one of the sealing rings; the negative pole column corresponds to the other annular bulge, the other upper plastic part and the other sealing ring; the material adopted by the plastic part corresponding to the positive pole column is different from the material adopted by the plastic part corresponding to the negative pole column; the upper plastic part corresponding to the positive pole column is made of a conductive material, and the upper plastic part corresponding to the negative pole column is made of an insulating material.
Another embodiment of the present application provides a secondary battery including:
a housing;
a bare cell located within the housing; and
a cap structure according to any one of the preceding claims, said cap structure being mounted to said housing.
Drawings
FIG. 1 is an exploded view of a top cover structure of an embodiment;
FIG. 2 is a partial cross-sectional view of the cap structure of FIG. 1;
FIG. 3 is a schematic view of the construction of the top cover sheet of FIG. 1;
FIG. 4 is an enlarged view of area A of FIG. 3;
FIG. 5 is a schematic view of the annular protrusion of FIG. 1;
FIG. 6 is a schematic view of the construction of the pole piece of FIG. 1;
FIG. 7 is a schematic structural view of the seal ring of FIG. 1;
fig. 8 is a schematic structural view of the lower plastic part in fig. 1.
The reference numbers illustrate:
100. a roof structure;
110. a top cover sheet; 101. pole mounting holes; 1011. a first hole; 1012. a second hole; 101a, a first step surface; 103. a third aperture; 103a, a second step surface;
120. an annular projection; 121. an annular body; 122. an annular bend; 109. a through hole;
130. a pole piece; 131. a first stage; 132. a second stage; 130a, a third step surface; 130b, a first surface;
140. applying a plastic part;
150. a seal ring; 151. a main body ring; 152. a protruding ring;
160. a plastic part is put; 161. a lower plastic body; 162. a lower plastic bulge loop; 163. a circular truncated cone;
170. an explosion-proof valve; 105. and a liquid injection hole.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Referring to fig. 1 and 2, a top cover structure 100 is provided according to an embodiment of the present disclosure. The top cap structure 100 is used to be mounted to a case of a secondary battery (not shown) so as to seal the secondary battery. The roof structure 100 includes: the top cover plate 110, the annular protrusion 120, the pole piece 130, the upper plastic part 140, the sealing ring 150 and the lower plastic part 160.
Referring to fig. 1 to 4, the top cover sheet 110 is provided with a pole mounting hole 101. The pole mounting hole 101 includes a first hole 1011 and a second hole 1012. The inner diameter of the second hole 1012 is larger than the inner diameter of the first hole 1011. The junction of the side wall of the first hole 1011 and the side wall of the second hole 1012 forms a first step surface 101 a. As shown in fig. 2, the first step surface 101a faces the first direction X. In the present embodiment, the first direction X is upward, i.e., the first step surface 101a faces upward.
Specifically, the pole mounting hole 101 is a stepped hole. The first hole 1011 is below the second hole 1012, and the inner diameter of the second hole 1012 is larger than the inner diameter of the first hole 1011, so the first step surface 101a faces upward. The pole mounting hole 101 is used to mount the pole piece 130.
Referring to fig. 1, 2 and 5, the annular protrusion 120 protrudes from the upper surface of the top cover sheet 110 and is fixedly connected to the top cover sheet 110, and the annular protrusion 120 is disposed around the edge of the pole mounting hole 101.
Specifically, the annular protrusion 120 is entirely in the shape of a square ring. Of course, the annular protrusion 120 may have other shapes such as a circular ring shape and an elliptical ring shape. The annular projection 120 is located at the periphery of the pole mounting hole 101, thus at the periphery of the pole post 130 and surrounding the pole post 130.
The annular protrusion 120 is made of the same material as the top cover sheet 110, and is made of metal material, so as to facilitate welding or integral molding of the two. For example, the top cover sheet 110 may be made of aluminum, and the annular protrusion 120 may be made of aluminum. As shown in fig. 2, the lower end of the annular protrusion 120 is fixedly coupled to the top cover sheet 110. The annular protrusion 120 and the top cover sheet 110 may be integrally formed, or may be separately formed and then welded together.
Referring to fig. 1, 2, and 6, the pole piece 130 is mounted to the pole mounting hole 101. The pole post 130 has a first surface 130b opposite the first step face 101 a. The first surface 130b faces the second direction Y. The second direction Y is opposite to the first direction X, and the second direction Y is downward (see arrow indication of fig. 2). That is, the first surface 130b faces downward such that the first surface 130b is opposite to the first step surface 101 a.
The post member 130 may be a positive post or a negative post. As shown in fig. 6, in the present embodiment, the first surface 130b is a lower surface of the pole piece 130. Of course, the first surface 130b may not be the surface of the lowermost end of the pole piece 130, and may be directed downward. The first surface 130b is opposite to the first step surface 101a, and the first surface 130b is located above the first step surface 101 a.
The upper plastic part 140 and the top cover sheet 110 together cover the surface of the annular protrusion 120, so that the annular protrusion 120 is completely covered. And, the upper plastic member 140 fills the gap between the annular protrusion 120 and the pole piece 130 and covers the outer circumferential surface of the pole piece 130 so as to space the annular protrusion 120 and the pole piece 130.
Specifically, the upper plastic part 140 is a plastic part, i.e., the adopted material is plastic, and therefore, the upper plastic part can be formed by glue filling and injection molding. As shown in fig. 2, the lower end surface of the annular projection 120 is connected to and attached to the top sheet 110, i.e., the lower end surface of the annular projection 120 is covered by the top sheet 110. The other surfaces of the annular protrusion 120 except the lower end surface are covered by the upper plastic member 140, so that the annular protrusion 120 is completely covered, thereby protecting the annular protrusion 120 and preventing the annular protrusion 120 from contacting the outside.
Further, the upper plastic part 140 is filled between the annular protrusion 120 and the post member 130, thereby spacing the annular protrusion 120 from the post member 130. Then, the upper plastic part 140 and the top cover plate 110 together cover the surface of the annular protrusion 120, and the upper plastic part 140 covers the outer peripheral surface of the pole column 130, so that the pole column 130 can be reliably connected to the annular protrusion 120, and further, the pole column 130, the top cover plate 110 and the annular protrusion 120 can be reliably connected, so that the pole column 130 is reliably mounted on the top cover plate 110. Referring to fig. 2, the upper plastic part 140 covers the outer peripheral surface of the pole piece 130 (i.e., the surface of the pole piece 130 opposite to the annular protrusion 120) when being filled between the annular protrusion 120 and the pole piece 130.
The seal ring 150 is disposed between the first surface 130b and the first step surface 101 a.
Specifically, as shown in fig. 2, the sealing ring 150 is sandwiched between the first surface 130b of the pole post 130 and the first stepped surface 101a of the top cover sheet 110, thereby spacing the pole post 130 from the top cover sheet 110 and sealing a gap between the pole post 130 and the top cover sheet 110, thereby preventing leakage of the electrolyte inside the secondary battery.
The lower plastic member 160 is attached to the lower surface of the top cover sheet 110. The lower plastic member 160 is located in the second direction Y of the top cover sheet 110, i.e. the lower plastic member 160 is located below the top cover sheet 110.
Specifically, as shown in fig. 2, the upper surface of the lower plastic part 160 is disposed to be attached to the lower surface of the top cover sheet 110. The lower plastic member 160 may be made of plastic. The lower plastic member 160 may be connected to the top cover sheet 110 by ultrasonic welding. The lower plastic member 160 is used to isolate the top cap sheet 110 from the internal structure of the secondary battery, so as to ensure that the top cap sheet 110 is insulated from the internal structure of the secondary battery, thereby preventing short circuit.
In the top cover structure 100, the pole post 130 is mounted in the pole mounting hole 101. The annular projection 120 is disposed around the pole piece 130. The upper plastic part 140 and the top cover plate 110 together cover the surface of the annular protrusion 120, the upper plastic part 140 is filled between the annular protrusion 120 and the post member 130, and the upper plastic part 140 covers the outer circumferential surface of the post member 130, so that the post member 130, the top cover plate 110 and the annular protrusion 120 can be reliably connected, and the post member 130 is reliably mounted on the top cover plate 110. The pole mounting hole 101 includes a first hole 1011 and a second hole 1012. The inner diameter of the second hole 1012 is larger than the inner diameter of the first hole 1011. The junction of the side wall of the first hole 1011 and the side wall of the second hole 1012 forms a first step surface 101 a. The first step surface 101a faces upward. The pole post 130 has a first surface 130b opposite the first step face 101 a. The seal ring 150 is provided between the first surface 130b and the first step surface 101a, so that the gap between the pole post 130 and the top cover sheet 110 can be sealed.
It is common in the prior art to extend the pole piece downwardly and radially to form a radially projecting flange. The gasket is then positioned over the flange to retain the gasket. Obviously, this results in an additional flange between the seal ring and the lower plastic part, which results in a thicker overall thickness of the cover structure.
Compared with the prior art, in the embodiment of the present application, since the sealing ring 150 is disposed between the first surface 130b and the first step surface 101a, it is not necessary to extend the pole post 130 below the sealing ring 150, so that the total height of the pole post 130 can be reduced, which is beneficial to thinning the top cover sheet 110. Also, the first stepped surface 101a is an inner wall of the post mounting hole 101, and the post mounting hole 101 is recessed in the upper surface of the top cover plate 110, and thus, the first stepped surface 101a is lower than the upper surface of the top cover plate 110. Since the first stepped surface 101a is lower than the upper surface of the top cover sheet 110, the sealing ring 150 is disposed on the first stepped surface 101a, so that the total thickness of the connecting structure of the top cover sheet 110, the sealing ring 150, and the pole post 130 can be reduced, thereby contributing to the lightness and thinness of the top cover structure 100.
In one embodiment, the lower end surface of the pole piece 130 is not lower than the lower end surface of the lower plastic piece 160.
Specifically, as shown in fig. 2, in the present embodiment, the pole piece 130 is located above the sealing ring 150, and the pole piece 130 is higher than the lower plastic piece 160. Of course, in order to facilitate the connection of the pole post 130 with the tab of the bare cell of the secondary battery, the size of the pole post 130 may be appropriately extended downward. However, since the lower plastic part 160 is located at the lowest part of the whole top cover structure 100, the lower end surface of the pole part 130 is not lower than the lower end surface of the lower plastic part 160, so that the thickness of the top cover structure 100 is not additionally increased, thereby being beneficial to the light and thin of the top cover structure 100.
Referring to fig. 4, in one embodiment, a third hole 103 is formed on the top cover sheet 110. The third bore 103 communicates with the second bore 1012 and together form a stepped bore. The inner diameter of the third hole 103 is larger than that of the second hole 1012, a second step surface 103a is formed at the junction of the side wall of the third hole 103 and the side wall of the second hole 1012, and the annular protrusion 120 is provided on the second step surface 103a and is fitted with the second step surface 103 a.
Specifically, as shown in fig. 4, the third hole 103 is located above the second hole 1012 and has an inner diameter greater than that of the second hole 1012, so that the third hole 103 and the second hole 1012 form a stepped hole. The step surface of the stepped hole is a second step surface 103 a. The second step surface 103a faces upward, and the second step surface 103a is located above the first step surface 101 a.
As can be seen from fig. 2, the second step surface 103a is annular as a whole. The annular protrusion 120 has an annular shape. The annular projecting portion 120 is fitted to the second step surface 103a, so that when the annular projecting portion 120 is placed on the second step surface 103a, the position of the annular projecting portion 120 can be determined, and then the annular projecting portion 120 and the second step surface 103a are welded, thereby facilitating the positioning of the annular projecting portion 120 by the second step surface 103 a.
Further, since the second step surface 103a is a junction of the side wall of the third hole 103 and the side wall of the second hole 1012, the second step surface 103a is lower than the upper surface of the top cover sheet 110, and thus, the lower end of the annular protrusion 120 can be lower than the upper surface of the top cover sheet 110. Compared with the prior art, the height of the annular protrusion 120 is reduced, thereby being beneficial to reducing the overall height of the top cover structure 100 and further being beneficial to lightening and thinning the top cover structure 100.
Referring to fig. 2 and 5, in an embodiment, the annular protrusion 120 includes: an annular body 121 and an annular bent portion 122. One end of the ring-shaped body 121 is fixedly connected with the top cover sheet 110. The annular bending portion 122 is fixedly connected to the other end of the annular body 121, and the annular body 121 and the annular bending portion 122 are disposed at an angle.
Specifically, as shown in fig. 5, the annular body 121 and the annular bent portion 122 are both annular. The annular bending portion 122 is fixedly connected to the upper end of the annular body 121, and the two can be integrally formed. The lower end of the ring-shaped body 121 is disposed on the second step surface 103a and is fixedly connected with the top cover sheet 110.
As shown in fig. 2, in the present embodiment, the annular bent portion 122 is bent in a direction close to the pole piece 130 relative to the annular body 121, and the bending angle is substantially a right angle. Of course, the bending angle may also be other angles, such as an acute angle or an obtuse angle. Through setting up annular body 121 and the annular kink 122 that is the angle setting for annular protrusion 120 and last plastic part 140 cooperation are more reliable, thereby are favorable to annular protrusion 120 and the pole column 130 to be connected reliably, and then are favorable to the pole column 130 to install reliably.
Referring to fig. 5, in an embodiment, the annular protrusion 120 is provided with a plurality of through holes 109 arranged at intervals along the circumferential direction. The upper plastic member 140 fills the through hole 109.
Specifically, as shown in fig. 5, the annular protrusion 120 is substantially square. Two through holes 109 are provided on each side of the square. When the upper plastic part 140 is formed by potting, the upper plastic part 140 can fill the through hole 109, so that the reliability of the connection with the annular protrusion 120 can be enhanced, and the torque of the pole piece 130 can be increased, so that the pole piece 130 is not easily twisted.
Referring to fig. 6, in an embodiment, the pole piece 130 includes: a first segment 131 and a second segment 132. The second section 132 is axially aligned and fixedly connected to the first section 131. The second section 132 has an outer diameter greater than that of the first section 131 and is located below the first section 131. A third step surface 130a is formed at a connection between an outer circumferential surface of the second section 132 and an outer circumferential surface of the first section 131, and the third step surface 130a is covered by the upper plastic member 140.
Specifically, with reference to fig. 6 and 3, the first segment 131 and the second segment 132 each have a generally square prism shape. Of course, the first segment 131 and the second segment 132 may be designed in other shapes, such as a cylindrical shape, an elliptic cylindrical shape, and the like.
The first section 131 is located above and has a smaller outer diameter. The second section 132 is located below and has a larger outer diameter. A third step surface 130a is formed at a connection between an outer circumferential surface (i.e., an outer side surface) of the first segment 131 and an outer circumferential surface (i.e., an outer side surface) of the second segment 132.
The third step surface 130a may be perpendicular to the outer circumferential surfaces of the first and second segments 131 and 132 such that the third step surface 130a faces upward.
As shown in fig. 2, in the present embodiment, the third step surface 130a is inclined to the outer circumferential surfaces of the first and second segments 131 and 132, and the third step surface 130a faces obliquely upward. Since the third stepped surface 130a is covered with the upper plastic part 140, the upper plastic part 140 can limit the pole column 130 from above or obliquely above the third stepped surface 130a, so that the pole column 130 can be prevented from being displaced upward relative to the top cover plate 110, which is advantageous for reliably mounting the pole column 130 to the top cover plate 110.
Further, in the present embodiment, since the third step surface 130a is inclined to the outer circumferential surfaces of the first and second segments 131 and 132, the third step surface 130a forms an obtuse angle with the outer circumferential surfaces of the first and second segments 131 and 132, respectively. Since the third step surface 130a forms an obtuse angle with the outer circumferential surface of the first segment 131 and the outer circumferential surface of the second segment 132, respectively, the third step surface 130a is inclined downward, so that when the plastic part 140 is formed by potting, the glue can flow downward from the third step surface 130a, and the space between the pole column 130 and the annular protrusion 120 can be easily filled.
Referring to fig. 2 and 7, in one embodiment, the sealing ring 150 includes a main ring 151 and a protruding ring 152. The protruding ring 152 is fixedly connected with the main body ring 151 and protrudes out of the lower surface of the main body ring 151, the outer diameter of the protruding ring 152 is smaller than that of the main body ring 151, the lower surface of the main body ring 151 is attached to the first step surface 101a, and the outer diameter of the protruding ring 152 is matched with the inner diameter of the first hole 1011.
Specifically, as shown in fig. 2 and 7, the protruding ring 152 and the main body ring 151 may be integrally formed. The lower surface of the body ring 151 is attached to the first step surface 101a, and the upper surface of the body ring 151 is attached to the first surface 130 b.
The protruding ring 152 is located at the inner edge of the main body ring 151 and protrudes from the lower surface of the main body ring 151. Because the outer diameter of the protruding ring 152 is matched with the inner diameter of the first hole 1011, when the protruding ring 152 is placed in the first hole 1011, the position of the sealing ring 150 can be determined, and the sealing ring 150 can be conveniently positioned.
Referring to fig. 1, 2 and 8, in one embodiment, the lower plastic member 160 includes a lower plastic body 161 and a lower plastic protrusion ring 162. The lower plastic protrusion ring 162 is fixedly connected to the lower plastic body 161 and protrudes from the upper surface of the lower plastic body 161. The upper surface of the lower plastic body 161 is attached to the lower surface of the top cover sheet 110. The outer diameter of the lower plastic bulge loop 162 is adapted to the inner diameter of the first hole 1011.
Specifically, as shown in fig. 2 and 8, the lower plastic body 161 and the lower plastic protrusion ring 162 may be integrally formed. The upper surface of the lower plastic body 161 and the lower surface of the top cover sheet 110 may be welded by ultrasonic welding. The lower plastic body 161 is rectangular as a whole. The lower plastic protrusion ring 162 is in the shape of a protruded square ring.
Because the lower plastic protrusion ring 162 protrudes from the upper surface of the lower plastic body 161, and the outer diameter of the lower plastic protrusion ring 162 is matched with the inner diameter of the first hole 1011, when the lower plastic protrusion ring 162 is placed in the first hole 1011, the position of the lower plastic part 160 can be determined, and the lower plastic part 160 can be conveniently positioned.
Referring to fig. 2, in one embodiment, the upper surface of the lower plastic protrusion ring 162 is attached to the lower surface of the protrusion ring 152.
Specifically, as shown in fig. 2, the lower end surface of the protruding ring 152 is tightly attached to the upper end surface of the lower plastic protruding ring 162, so that the side wall of the first hole 1011 can be shielded, and the side wall of the first hole 1011 is prevented from being exposed, thereby further isolating the top cover sheet 110 from the structure inside the secondary battery, so as to ensure that the top cover sheet 110 is insulated from the structure inside the secondary battery, and prevent short circuit.
Referring to fig. 1 and 8, a circular truncated cone 163 is disposed on the lower plastic body 161, and the circular truncated cone 163 is positioned by matching with a corresponding circular hole (not shown) disposed on the lower surface of the top cover sheet 110, and then the circular truncated cone 163 is ultrasonically welded to the top cover sheet 110.
Referring to fig. 1, the top cover structure 100 further includes an explosion-proof valve 170 mounted on the top cover sheet 110, and a liquid injection hole 105 formed in the top cover sheet 110.
Referring to fig. 1, in one embodiment, the number of the pole members 130 is two, one of which is a positive pole 130z, and the other is a negative pole 130 f. The number of the post mounting holes 101 is two, one of which is for mounting the positive post 130z and the other of which is for mounting the negative post 130 f. The number of the annular protrusion 120, the upper plastic part 140 and the sealing ring 150 is two. The positive post 130z corresponds to one of the annular protrusions 120, one of the upper plastic pieces 140z, and one of the sealing rings 150. The negative post 130f corresponds to the other annular protrusion 120, the other upper plastic part 140f and the other sealing ring 150. The plastic part 140z corresponding to the positive post 130z is made of a different material from the plastic part 140f corresponding to the negative post 130 f. The upper plastic part 140z corresponding to the positive post 130z is made of a conductive material. The upper plastic part 140f corresponding to the negative post 130f is an insulating material.
Specifically, in the top cover structure 100, the negative electrode tab 130f needs to be provided insulated from the top cover sheet 110. The positive post 130z needs to be electrically connected to the top cover sheet 110. Therefore, in the present embodiment, the upper plastic part 140z corresponding to the positive post 130z is made of a conductive material. The upper plastic part 140f corresponding to the negative post 130f is an insulating material.
The upper plastic part 140f corresponding to the negative pole 130f is made of one or more of PPS plastic material, PA (polyamide), PP (polypropylene), PTFA (polytetrafluoroethylene), and the like, and PPS plastic material is preferred.
The material used for the upper plastic part 140z corresponding to the positive post 130z may be one or a mixture of PPS plastic raw material, PA (polyamide), PP (polypropylene), PTFA (polytetrafluoroethylene), and the like. However, some conductive materials such as silicon material and graphite need to be added to the plastic material used for the upper plastic part 140z corresponding to the positive post 130z, so that the upper plastic part 140z corresponding to the positive post 130z can be conductive.
Another embodiment of the present application provides a secondary battery. The secondary battery includes: the casing, be located naked electric core and the top cap structure 100 of above-mentioned any of casing, top cap structure 100 installs in the casing.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A roof structure, comprising:
the top cover plate is provided with a pole mounting hole, the pole mounting hole comprises a first hole and a second hole, the inner diameter of the second hole is larger than that of the first hole, a first step surface is formed at the joint of the side wall of the first hole and the side wall of the second hole, and the first step surface faces to a first direction X;
the annular protruding part protrudes out of the upper surface of the top cover plate and is fixedly connected with the top cover plate, and the annular protruding part is arranged around the edge of the pole mounting hole;
a pole post mounted to the pole mounting hole, the pole post having a first surface opposite the first step surface, the first surface facing a second direction Y, the second direction Y being opposite the first direction X;
the upper plastic part and the top cover plate jointly cover the surface of the annular bulge part, so that the annular bulge part is completely covered, and the upper plastic part is filled in a gap between the annular bulge part and the pole column part and covers the surface of the pole column part;
the sealing ring is arranged between the first surface and the first step surface in a cushioning mode; and
and the lower plastic part is attached to the lower surface of the top cover piece and is positioned in the second direction Y of the top cover piece.
2. The roof structure of claim 1, wherein the lower end surface of the pole piece is not lower than the lower end surface of the lower plastic piece.
3. The top cover structure of claim 1, wherein a third hole is formed in the top cover sheet, the third hole is communicated with the second hole and forms a stepped hole together with the second hole, the inner diameter of the third hole is larger than that of the second hole, a second stepped surface is formed at the joint of the side wall of the third hole and the side wall of the second hole, and the annular protrusion is arranged on the second stepped surface and is matched with the second stepped surface.
4. The cap structure according to claim 1, wherein the annular protrusion comprises:
one end of the annular body is fixedly connected with the top cover plate; and
the annular bending part is fixedly connected with the other end of the annular body, and the annular body and the annular bending part are arranged at an angle.
5. The roof structure of claim 4, wherein the annular protrusion has a plurality of through holes spaced circumferentially.
6. The roof structure of claim 1, wherein the pole piece comprises: the plastic part comprises a first section and a second section, wherein the second section and the first section are axially arranged and fixedly connected, the outer diameter of the second section is larger than that of the first section and is positioned below the first section, a third step surface is formed at the joint of the outer peripheral surface of the second section and the outer peripheral surface of the first section, and the third step surface is covered by the upper plastic part.
7. The roof structure of claim 6, wherein said third step surface is inclined to the outer peripheral surface of said first section and the outer peripheral surface of said second section; the outer peripheral surface of the first section and the outer peripheral surface of the second section form obtuse angles with the third step surface respectively.
8. The top cover structure of claim 1, wherein the sealing ring comprises a main body ring and a protruding ring, the protruding ring is fixedly connected with the main body ring and protrudes out of the lower surface of the main body ring, the outer diameter of the protruding ring is smaller than that of the main body ring, the lower surface of the main body ring is attached to the first step surface, and the outer diameter of the protruding ring is matched with the inner diameter of the first hole.
9. Roof construction in accordance with claim 1,
the number of the pole column pieces is two, one pole column is a positive pole column, and the other pole column is a negative pole column;
the number of the pole mounting holes is two, one pole mounting hole is used for mounting the positive pole, and the other pole mounting hole is used for mounting the negative pole;
the number of the annular convex parts, the number of the upper plastic parts and the number of the sealing rings are two respectively; the positive post corresponds to one of the annular bulges, one of the upper plastic parts and one of the sealing rings; the negative pole column corresponds to the other annular bulge, the other upper plastic part and the other sealing ring; the material adopted by the plastic part corresponding to the positive pole column is different from the material adopted by the plastic part corresponding to the negative pole column; the upper plastic part corresponding to the positive pole column is made of a conductive material, and the upper plastic part corresponding to the negative pole column is made of an insulating material.
10. A secondary battery, characterized by comprising:
a housing;
a bare cell located within the housing; and
a roof structure as claimed in any one of claims 1 to 9, said roof structure being mounted to said housing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120665091.6U CN214898627U (en) | 2021-04-01 | 2021-04-01 | Secondary battery and its top cover structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120665091.6U CN214898627U (en) | 2021-04-01 | 2021-04-01 | Secondary battery and its top cover structure |
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| CN214898627U true CN214898627U (en) | 2021-11-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114284542A (en) * | 2021-12-28 | 2022-04-05 | 山西中科华孚汽车动力研究总院有限公司 | Battery manufacturing method and battery |
| WO2022262403A1 (en) * | 2021-06-16 | 2022-12-22 | 深圳市长盈精密技术股份有限公司 | Traction battery top cover and manufacturing method therefor |
| CN116780062A (en) * | 2023-07-05 | 2023-09-19 | 深圳市长盈精密技术股份有限公司 | Battery top cover, assembly method and power battery |
| WO2025102574A1 (en) * | 2023-11-17 | 2025-05-22 | 惠州亿纬动力电池有限公司 | Lower plastic component, end cover assembly and battery cell |
| WO2025185130A1 (en) * | 2024-03-04 | 2025-09-12 | 欣旺达动力科技股份有限公司 | Secondary battery, battery pack, and electrical device |
| WO2026044820A1 (en) * | 2024-08-28 | 2026-03-05 | 苏州美阅新能源有限公司 | Double-sealed battery cover plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022262403A1 (en) * | 2021-06-16 | 2022-12-22 | 深圳市长盈精密技术股份有限公司 | Traction battery top cover and manufacturing method therefor |
| CN114284542A (en) * | 2021-12-28 | 2022-04-05 | 山西中科华孚汽车动力研究总院有限公司 | Battery manufacturing method and battery |
| CN114284542B (en) * | 2021-12-28 | 2024-02-06 | 山西中科华孚电池研究总院有限公司 | Manufacturing method of battery and battery |
| CN116780062A (en) * | 2023-07-05 | 2023-09-19 | 深圳市长盈精密技术股份有限公司 | Battery top cover, assembly method and power battery |
| CN116780062B (en) * | 2023-07-05 | 2024-06-11 | 深圳市长盈精密技术股份有限公司 | Battery top cover, assembly method and power battery |
| WO2025102574A1 (en) * | 2023-11-17 | 2025-05-22 | 惠州亿纬动力电池有限公司 | Lower plastic component, end cover assembly and battery cell |
| WO2025185130A1 (en) * | 2024-03-04 | 2025-09-12 | 欣旺达动力科技股份有限公司 | Secondary battery, battery pack, and electrical device |
| WO2026044820A1 (en) * | 2024-08-28 | 2026-03-05 | 苏州美阅新能源有限公司 | Double-sealed battery cover plate |
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Effective date of registration: 20250123 Address after: A complete set of factory building at 1226 Guanxiang Road, Guixiang Community, Guanlan Street, Longhua District, Shenzhen City, Guangdong Province 518110 Patentee after: Shenzhen Guohong New Energy Technology Co.,Ltd. Country or region after: China Address before: C1609-050B, Oriental Xintiandi Plaza, No. 1003, Shennan Avenue, Gangsha Community, Futian Street, Futian District, Shenzhen, Guangdong 518033 Patentee before: Shenzhen Shanglang Enterprise Management Co.,Ltd. Country or region before: China |