Insulating cover plate and battery

Abstract

The utility model discloses an insulating cover plate and battery belong to battery technical field, and the insulating cover plate is including the base plate, is provided with the base hole of the through base plate, the pole, the insulating connecting piece is set up between the pole and the base hole, the insulating connecting piece is provided with at least one connecting surface and is connected with the pole through the first brazing layer, and the insulating connecting piece is provided with at least one connecting surface and is connected with the base hole through the second brazing layer. The utility model discloses brazing process forms the brazing layer, and the brazing layer has the compact structure, can strengthen the cover plate leakproofness, and the brazing layer welds the insulating connecting piece between the base plate and the pole, and the insulating connecting piece has the insulation characteristic itself, and the sealing ring and other accessories are saved, and the cover plate structure is simplified.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to an insulating cover and a battery. Background Technology

[0002] With the rapid development of the new energy industry, the industry's requirements for battery quality and cost are increasing. The cover plates for single lithium batteries are becoming increasingly simpler, from riveting structures to injection-molded terminals, continuously reducing cover plate weight and cost. However, with the development of the lithium battery industry, there is a growing demand for simpler and lower-cost cover plate terminals.

[0003] For example, Chinese patent document CN103378321B discloses a cover plate assembly and a battery containing the cover plate assembly. The cover plate assembly includes a cover plate body, a cover plate connector, and electrode terminals. The cover plate connector has an electrode hole penetrating the cover plate connector, and the electrode terminals pass through the electrode hole and are insulated and sealed with the cover plate connector. The cover plate body has a through hole penetrating the cover plate body, and the electrode terminals pass through the through hole to lead out current. The cover plate connector is sealed to the cover plate body. Although this cover plate assembly is not easily deformed during manufacturing, its structure is relatively complex, requiring ceramic seals and cover plate connectors in conjunction with sealing rings to form an insulating seal. Utility Model Content

[0004] The purpose of this utility model is to provide an insulating cover plate and battery, which solves the problem that the existing cover plate assembly structure is relatively complex and requires ceramic seals, cover plate connectors and sealing rings to form an insulating seal.

[0005] To achieve the above objectives, this utility model provides an insulating cover plate, including... The substrate has a through-hole. pole; An insulating connector is disposed between the pole post and the base hole; The insulating connector has at least one connecting surface that is connected to the pole post through a first brazing layer; the insulating connector has at least one connecting surface that is connected to the base hole through a second brazing layer.

[0006] Furthermore, the hole shape of the base hole is a circular hole, an elliptical hole, or a polygonal hole, and the insulating connector adopts an annular structure corresponding to the hole shape of the base hole; the outer side of the insulating connector is fitted to the inner wall of the base hole, and the outer side of the pole is fitted to the inner wall of the insulating connector.

[0007] The above technical solutions allow for a variety of hole shapes to meet diverse structural design requirements. The insulating connectors are fitted snugly to both the hole and the pole, which helps to increase the sealing performance of the cover plate structure.

[0008] Furthermore, the base hole is a stepped hole, including a first hole and a second hole that are connected, the diameter of the second hole being larger than that of the first hole; the insulating connector includes a ring base and an extension portion disposed at one end of the ring base, the connection between the ring base and the extension portion being in contact with the step of the stepped hole; the second brazing layer is disposed at the step of the stepped hole.

[0009] The stepped hole and the insulating connector work together, and there are two contact surfaces between the insulating connector and the base hole. The second brazing layer is distributed between the two contact surfaces, thus achieving a better sealing effect.

[0010] Furthermore, the pole includes a base and an extension at one end of the base, the junction of the base and the extension is in contact with the step of the insulating connector, and the first brazing layer is disposed at the step of the insulating connector.

[0011] The pole post forms a step at the edge of the insulating connector through the extension and the base of the post, so that there are two connection surfaces between the pole post and the insulating connector. The first brazing layer is distributed at the two connection surfaces, which further enhances the sealing performance of the cover plate.

[0012] Furthermore, a gap is left between the outer surface of the extension portion and the inner wall of the second hole.

[0013] The gap facilitates brazing and provides space for the brazing filler material to flow freely, allowing it to cool and form a dense brazing layer.

[0014] Furthermore, the pole post has a conical or frustum structure, and the inner hole of the insulating connector is a conical hole.

[0015] The pole is cone-shaped or frustum-shaped, with an inclined outer surface that allows for a tighter fit with the conical inner hole of the insulating connector during installation.

[0016] Furthermore, the outer surface of the pole post is provided with multiple grooves surrounding the central axis of the pole post, and the first brazing layer is embedded in the grooves.

[0017] The first brazing layer is embedded in the groove, which can increase the sealing between the pole and the insulating connector. On the other hand, the groove facilitates the positioning of the pole and the insulating connector before brazing, and at the same time, the groove also serves as a container for the brazing filler metal, which helps to improve the brazing quality.

[0018] Furthermore, the pole post is an oblique column structure.

[0019] Compared to a vertical cylinder of the same height, an inclined cylinder has a slightly longer sidewall. In the brazing process, this theoretically slightly extends the path of the first brazing layer, helping to improve sealing reliability. Moreover, in automated assembly processes, the inclined cylinder's directionality serves as a mistake-proofing design feature.

[0020] Furthermore, the top surface of the pole is either flush with or lower than the upper surface of the substrate.

[0021] The above technical solutions can improve the space utilization rate of battery cells in the height direction. When battery cells are packaged into battery packs, the space occupied by the battery cells above the battery pack can be reduced, which facilitates the arrangement of other electrical components.

[0022] This utility model also provides a battery, including the aforementioned insulating cover plate.

[0023] Compared with existing known technologies, the technical solution provided by this utility model has the following beneficial effects: This utility model discloses an insulating cover plate. A first brazed layer and a second brazed layer connect the insulating connector and the terminal post. The brazed layer fills the gap between the substrate and the terminal post, and its dense structure effectively prevents leakage of electrolyte or gas inside the battery, providing excellent sealing performance. The insulating connector itself has insulating properties and is positioned between the substrate and the terminal post, achieving insulation between them. The brazing process forms the brazed layer, eliminating the need for sealing rings and other accessories, thus simplifying the cover plate structure.

[0024] It is obvious that the elements or features described in the above individual embodiments can be used alone or in combination in other embodiments. Attached Figure Description

[0025] The dimensions and scales in the accompanying drawings do not represent the dimensions and scales of the actual product. The drawings are for illustrative purposes only, and some non-essential elements or features have been omitted for clarity.

[0026] Figure 1 This is a schematic diagram of the assembly structure of the cover plate in an embodiment of this utility model; Figure 2 This is an exploded structural diagram of the cover plate in an embodiment of this utility model; Figure 3 This is a cross-sectional structural diagram (I) of the cover plate in the assembled state in an embodiment of this utility model. Figure 4 This is a cross-sectional structural diagram (II) of the cover plate in the assembled state in an embodiment of this utility model; Figure 5 This is a schematic diagram of the pole structure in an embodiment of this utility model (I); Figure 6 This is a schematic diagram (II) of the pole structure in an embodiment of this utility model; Figure 7 This is a schematic diagram (three) of the pole structure in an embodiment of this utility model.

[0027] Explanation of reference numerals in the attached figures 100, substrate; 110, basic hole; 120, gap; 200, pole; 210, pole base; 220, extension; 300. Insulating connector; 310. Ring base; 320. Extension portion; 400. First brazing layer; 500, Second brazing layer. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings. The embodiments described herein are merely preferred embodiments of the present invention. Those skilled in the art can conceive of other ways to implement the present invention based on the preferred embodiments, and such other ways also fall within the scope of the present invention.

[0029] Reference Figures 1-7 This embodiment provides an insulating cover plate, including a substrate 100, a pole post 200, and an insulating connector 300. The substrate 100 has a through hole 110, the pole post 200 is installed in the through hole 110, and the insulating connector 300 is disposed between the pole post 200 and the through hole 110. The insulating connector 300 has at least one connecting surface that is connected to the pole post 200 through a first brazing layer 400; the insulating connector 300 also has at least one connecting surface that is connected to the through hole 110 through a second brazing layer 500.

[0030] The first brazing layer 400 and the second brazing layer 500 are formed by welding brazing filler metal to the insulating connector 300 and the terminal 200 at high temperatures, and to the substrate 100 and the insulating connector 300, respectively. The molten brazing filler metal fills the tiny gap between the terminal 200 and the substrate 100, forming a dense brazing layer after cooling. This effectively prevents leakage of electrolyte or gas inside the battery, providing excellent sealing. Furthermore, the insulating connector 300 itself has insulating properties and is positioned between the substrate 100 and the terminal 200, achieving insulation between them. Forming the brazing layer through a brazing process eliminates the need for sealing rings and other accessories, simplifying the cover plate structure.

[0031] It should be noted that the insulating connector 300 is preferably made of ceramic material, as ceramic has insulation properties, good hardness, and high temperature resistance. In addition, the insulating connector 300 can also be made of glass, adhesive, plastic, insulating coating material, rubber, etc.

[0032] The basic hole 110 is a through hole, and various shapes are available. As a preferred embodiment of the shape of the basic hole 110, such as... Figure 2As shown, the hole 110 is circular, and the corresponding insulating connector 300 is an annular structure. The outer surface of the insulating connector 300 is fitted against the inner wall of the hole 110, and the outer surface of the pole post 200 is fitted against the inner wall of the insulating connector 300. This fitted structural design helps to increase the sealing performance of the cover plate structure. It is understood that the hole 110 can also be elliptical or polygonal, and the insulating connector 300 can adopt an annular structure corresponding to the hole shape of the hole 110, such as an elliptical ring or a polygonal ring.

[0033] In some embodiments, refer to Figure 4 The base hole 110 is a stepped hole, including a first hole and a second hole that are connected, with the diameter of the second hole being larger than that of the first hole. The first hole is located above the second hole and faces the outside of the battery. The insulating connector 300 includes a ring base 310 and an extension 320 disposed at one end of the ring base 310. Both the ring base 310 and the extension 320 are circular ring structures, and the junction of the ring base 310 and the extension 320 fits against the step of the stepped hole; the second brazing layer 500 is disposed at the step of the stepped hole. At this time, there are two contact surfaces between the insulating connector 300 and the base hole 110, and therefore the second brazing layer 500 is correspondingly present between the two contact surfaces.

[0034] Furthermore, in some embodiments, the pole post 200 includes a base portion 210 and an extension portion 220 disposed at one end of the base portion 210. Both the base portion 210 and the extension portion 220 are cylindrical structures. The junction of the base portion 210 and the extension portion 220 is abutted against the step of the insulating connector 300, and the first brazing layer 400 is disposed at the step of the insulating connector 300. It can be understood that there are two contact surfaces between the insulating connector 300 and the pole post 200, therefore the first brazing layer 400 exists between the two contact surfaces.

[0035] It should be noted that in some embodiments, a gap 120 is left between the outer surface of the extension portion 320 and the inner wall of the second hole. The extension portion 320 is not tightly fitted to the inner wall of the second hole. The gap 120 facilitates the brazing operation and provides sufficient flow space for the brazing material, which is convenient for cooling.

[0036] In addition to a cylindrical structure, the pole post 200 can also adopt other structures. In some embodiments, such as Figure 5 As shown, the pole post 200 has a conical or frustum-shaped structure, and the inner hole of the insulating connector 300 is a conical hole. In this embodiment, the inclined surface of the side wall of the pole post 200 can form a tighter fit with the conical inner hole of the insulating connector 300 during installation.

[0037] In other embodiments, such as Figure 6As shown, the outer surface of the electrode post 200 is provided with multiple grooves surrounding the central axis of the electrode post 200, and the first brazing layer 400 is embedded in the grooves. On the one hand, the embedding of the first brazing layer 400 in the grooves can increase the sealing between the electrode post 200 and the insulating connector 300. On the other hand, the grooves facilitate the positioning of the electrode post 200 and the insulating connector 300 before brazing, and at the same time, the grooves also serve as a receiving groove for the brazing material, which helps to improve the brazing quality and increase the structural stability between the electrode post 200 and the insulating connector 300.

[0038] Furthermore, in some embodiments, such as Figure 7 As shown, the pole piece 200 is an angled column structure. Compared to a vertical cylinder of the same height, the sidewall length of the angled cylinder is slightly longer. In the brazing process, this theoretically slightly extends the path of the first brazing layer 400, helping to improve sealing reliability. Moreover, the angled cylinder is directional during automated assembly. This means that machines or workers must insert it at a specific angle during installation to prevent reversed positive and negative polarity or incorrect placement of parts.

[0039] It should be noted that, in order to improve the space utilization of the battery cells in the height direction, in some embodiments, the top surface of the terminal post 200 is flush with or lower than the upper surface of the substrate 100. Therefore, when the battery cells are packaged to form a battery pack, the space occupied by the battery cells above the battery pack can be reduced, which helps to save electrical space and facilitates the arrangement of other electrical components.

[0040] One aspect of this application provides a battery including the aforementioned insulating cover. Therefore, this battery incorporates all the advantages of the insulating cover, which will not be elaborated further here.

[0041] In the description of this utility model, it should be noted that the terms "front," "rear," "left," "right," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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.

[0043] The scope of protection of this utility model is defined only by the claims. Thanks to the teachings of this utility model, those skilled in the art will readily recognize that alternative structures to the disclosed structure can be used as feasible alternative implementations, and that the disclosed implementations can be combined to produce new implementations, which also fall within the scope of the appended claims.

Claims

1. An insulating cover plate, comprising: The substrate (100) has a through hole (110) that penetrates the substrate (100). pole (200); An insulating connector (300) is disposed between the pole post (200) and the base hole (110); Its features are, The insulating connector (300) has at least one connecting surface that is connected to the pole post (200) through the first brazing layer (400); the insulating connector (300) has at least one connecting surface that is connected to the base hole (110) through the second brazing layer (500).

2. An insulating cover plate according to claim 1, characterized in that, The hole shape of the base hole (110) is a circular hole, an elliptical hole or a polygonal hole, and the insulating connector (300) adopts an annular structure corresponding to the hole shape of the base hole (110); the outer side of the insulating connector (300) is fitted to the inner wall of the base hole (110), and the outer side of the pole (200) is fitted to the inner wall of the insulating connector (300).

3. An insulating cover plate according to claim 1, characterized in that, The base hole (110) is a stepped hole, including a first hole and a second hole that are connected, and the diameter of the second hole is larger than that of the first hole; the insulating connector (300) includes a ring base (310) and an extension (320) disposed at one end of the ring base (310), and the connection between the ring base (310) and the extension (320) is in contact with the step of the stepped hole; the second brazing layer (500) is disposed at the step of the stepped hole.

4. An insulating cover plate according to claim 3, characterized in that, The pole post (200) includes a base (210) and an extension (220) disposed at one end of the base (210). The connection between the base (210) and the extension (220) is in contact with the step of the insulating connector (300). The first brazing layer (400) is disposed at the step of the insulating connector (300).

5. An insulating cover plate according to claim 3, characterized in that, A gap (120) is left between the outer surface of the extension (320) and the inner wall of the second hole.

6. An insulating cover plate according to claim 2, characterized in that, The pole post (200) has a conical or frustum structure, and the inner hole of the insulating connector (300) is a conical hole.

7. An insulating cover plate according to claim 1, characterized in that, The outer surface of the pole post (200) is provided with multiple grooves surrounding the central axis of the pole post (200), and the first brazing layer (400) is embedded in the grooves.

8. An insulating cover plate according to claim 1, characterized in that, The pole (200) is an oblique column structure.

9. An insulating cover plate according to claim 1, characterized in that, The top surface of the pole (200) is level with or lower than the upper surface of the substrate (100).

10. A battery, characterized in that, Includes the insulating cover plate as described in any one of claims 1-9.

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