CN215869575U

CN215869575U - Battery cover plate assembly and battery

Info

Publication number: CN215869575U
Application number: CN202121187357.7U
Authority: CN
Inventors: 齐彬伟; 周勇; 徐雨; 许久凌
Original assignee: Avic Innovation Technology Research Institute Jiangsu Co ltd; China Lithium Battery Technology Co Ltd
Current assignee: Avic Innovation Technology Research Institute Jiangsu Co ltd; China Lithium Battery Technology Co Ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2022-02-18
Anticipated expiration: 2031-05-31

Abstract

The utility model discloses a battery cover plate component and a battery, wherein the battery cover plate component comprises a cover plate body and a terminal, the cover plate body comprises a groove arranged on the upper surface of the cover plate body, and a bearing part is convexly arranged on the bottom wall and/or the side wall of the groove; the terminal is arranged in the groove, and in the thickness direction of the cover plate body, the terminal and the bearing part are at least partially overlapped. When the terminal receives the effort along the ascending effort of the thickness direction of apron body, the effort that the diapire of recess bore can be divided into share in the setting of bearing part for the apron body is non-deformable more. At the same time, since the limit value of the force to which the bottom wall of the recess is subjected is greater, the limit value of the force to which the terminal is subjected is also greater, which is more advantageous for the connection of the terminal to the pole. According to the battery cover plate assembly provided by the embodiment of the utility model, on the basis of saving the material of the cover plate body, the cover plate body is not easy to deform.

Description

Battery cover plate assembly and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery cover plate assembly and a battery.

Background

In the related art, a battery post penetrates through a cover plate and is connected to a terminal. In order to reduce the size of the battery and save the material of the cover plate, the upper surface of the cover plate is usually provided with a groove, and the terminal is accommodated in the groove. However, although the design of the grooves can achieve the above-mentioned effects of reducing volume and saving material, the thickness of the cover plate where the grooves are formed is also correspondingly reduced, which causes the cover plate to be easily deformed by force when the terminal and the post are connected, thereby affecting the quality of the battery.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a battery cover plate assembly with a cover plate difficult to deform and a battery.

The battery cover plate assembly comprises a cover plate body and a terminal, wherein the cover plate body comprises a groove arranged on the upper surface of the cover plate body, and a bearing part is convexly arranged on the bottom wall and/or the side wall of the groove; the terminal is arranged in the groove, and in the thickness direction of the cover plate body, the terminal and the bearing part are at least partially overlapped.

The battery of the embodiment of the utility model comprises the battery cover plate component.

An embodiment in the above-mentioned utility model has following advantage or beneficial effect:

according to the battery cover plate assembly provided by the embodiment of the utility model, the bearing part is convexly arranged on the bottom wall and/or the side wall of the groove, and the terminal and the bearing part are at least partially overlapped in the thickness direction of the cover plate body. When the terminal receives the effort along the ascending effort of the thickness direction of apron body, the effort that the diapire of recess bore can be divided into share in the setting of bearing part for the apron body is non-deformable more. At the same time, since the limit value of the force to which the bottom wall of the recess is subjected is greater, the limit value of the force to which the terminal is subjected is also greater, which is more advantageous for the connection of the terminal to the pole. Therefore, the battery cover plate assembly provided by the embodiment of the utility model has the advantage that the cover plate body is not easy to deform on the basis of saving the material of the cover plate body.

Drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a schematic structural diagram of a battery cover plate assembly according to an embodiment of the present invention.

Fig. 2 is an exploded view of a battery cover plate assembly according to an embodiment of the present invention.

Fig. 3 shows a cross-sectional view a-a in fig. 1.

Fig. 4 is a partial structural schematic diagram of the cover plate body according to the embodiment of the present invention.

Fig. 5 is a schematic structural view of a terminal according to an embodiment of the present invention.

Fig. 6 is a schematic view of a perspective view of an insulator according to an embodiment of the present invention.

Fig. 7 is a schematic view of another perspective of an insulator according to an embodiment of the present invention.

Wherein the reference numerals are as follows:

100. cover plate body

101. Upper surface of

120. Groove

121. Bottom wall

122. Side wall

130. Bearing part

131. The top surface

132. Side surface

133. Depressions

200. Pole post

300. Adapter

610. Sealing element

620. First insulating member

630. Second insulating member

631. Projection

632. Limiting groove

632a, groove bottom wall

632b, groove side walls

633. Step part

634. Depressions

700. Terminal with a terminal body

710. Lower surface

720. Peripheral surface

730. Gap

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

As shown in fig. 1 and 2, fig. 1 is a schematic structural diagram of a battery cover plate assembly according to an embodiment of the present invention. Fig. 2 is an exploded view of a battery cover plate assembly according to an embodiment of the present invention. The battery cover plate assembly of the embodiment of the utility model comprises: the terminal comprises a cover plate body 100, a pole post 200, an adapter 300, a sealing member 610, a first insulating member 620, a second insulating member 630 and a terminal 700. The adaptor 300 can be connected to a tab of a battery cell, and the terminal 200 is connected to the adaptor 300, for example, by welding, so as to electrically connect the terminal 200 to the battery cell. The pole 200 is connected to the terminal 700 through the cap body 100, for example, by riveting. The seal 610 seals between the cap body 100 and the post 200. The first insulator 620 is disposed between the interposer 300 and the cap body 100, and the second insulator 630 is disposed between the cap body 100 and the terminal 700.

It should be noted that the connection relationship and the operation of the components are described above only by taking the embodiment as an example, and the utility model should not be limited thereto, and those skilled in the art can make modifications according to the design requirements.

As shown in fig. 3 and 4, fig. 3 shows a cross-sectional view a-a of fig. 1. Fig. 4 is a partial structural schematic diagram of the cover plate body according to the embodiment of the present invention. The cover plate body 100 of the embodiment of the utility model comprises a groove 120 arranged on the upper surface 101 of the cover plate body 100, and a bearing part 130 is convexly arranged on the bottom wall 121 and/or the side wall 122 of the groove 120. The groove 120 is used for accommodating the terminal 700 and the second insulating member 630.

As shown in fig. 3, when the terminal 700 is disposed in the groove 120, the terminal 700 and the carrier 130 at least partially overlap in the thickness direction of the cap body 100.

In the related art, when the terminal 700 and the post 200 need to be connected, a caulking method is often used. Since the terminal 700 is accommodated in the groove 120, the riveting force in the thickness direction of the cap body 100 is transferred to the bottom wall 121 of the groove 120 during the riveting process. Since the cover body 100 is provided with the groove 120, the thickness of the bottom wall 121 is smaller than that of the area of the cover body 100 where no groove is provided. When receiving the riveting force, the bottom wall 121 is easily deformed, which affects the quality of the battery cover plate assembly.

In the battery cover plate assembly according to the embodiment of the present invention, the bearing part 130 is protruded on the bottom wall 121 and/or the side wall 122 of the groove 120, and the terminal 700 and the bearing part 130 are at least partially overlapped in the thickness direction of the cover plate body 100. When the terminal 700 receives an acting force along the thickness direction of the cover plate body 100, the bottom wall 121 of the groove 120 can be distributed by the arrangement of the bearing part 130, so that the cover plate body 100 is not easy to deform. At the same time, since the limit value of the force applied to the bottom wall 121 of the groove 120 becomes larger, the limit value of the force applied to the terminal 700 becomes larger, which is more favorable for the connection of the terminal 700 and the pole post 200. Therefore, the battery cover plate assembly according to the embodiment of the utility model is not easy to deform the cover plate body 100 on the basis of saving the material of the cover plate body 100.

Referring to fig. 3, the thickness of the region of the cover plate body 100 not provided with the groove 120 is greater than the thickness of the carrying portion 130, and the thickness of the carrying portion 130 is greater than the thickness of the bottom wall 121 of the groove 120. Since the bottom wall 121 of the groove 120 is thinner, the depth of the groove 120 is deeper, and after the terminal 700 is disposed in the groove 120, the thicknesses of the terminal 700 and the cap body 100 can be reduced as much as possible, thereby further improving the energy density of the battery.

As shown in fig. 4, the bearing part 130 is disposed at the junction of the bottom wall 121 and the side wall 122, that is, the bearing part 130 is connected to both the bottom wall 121 and the side wall 122. When the bearing part 130 is acted by force, under the combined action of the bottom wall 121 and the side wall 122, the limit value of the acting force applied to the bearing part 130 is larger, and the cover plate body 100 is less prone to deformation.

Of course, it is understood that the bearing portion 130 may be only protruded from the bottom wall 121, and not connected to the side wall 122. Alternatively, the bearing part 130 may be only protruded from the sidewall 122, and not connected to the bottom wall 121.

Alternatively, the bearing part 130 may be a strip-shaped structure, and is disposed at the joint of the bottom wall 121 and the side wall 122, but not limited thereto, and for example, the bearing part may also be a plurality of bumps disposed at intervals, and each bump is disposed at the joint of the bottom wall 121 and the side wall 122.

Alternatively, the number of the bearing parts 130 may be two, and two bearing parts 130 are respectively arranged at the junctions of the two oppositely arranged side walls 122 and the bottom wall 121 of the groove 120. Alternatively, the number of the supporting portions 130 may be one, three, etc.

Of course, the bearing portion 130 may also be an annular structure disposed along the outer periphery of the bottom wall 121 of the groove 120.

With reference to fig. 3 and fig. 4, the supporting portion 130 includes a top surface 131 and a side surface 132 adjacent to each other, the top surface 131 is perpendicular to the sidewall 122, and the side surface 132 is perpendicular to the bottom wall 121. Thus, the bearing part 130, the bottom wall 121 and the side wall 122 together form a one-step structure.

As shown in fig. 3, when the terminal 700 is received in the recess 120, the lower surface 710 of the terminal 700 is flush with or lower than the top surface 131 of the carrier 130. The lower surface 710 of the terminal 700 is flush with or lower than the upper surface 101 of the cap body 100.

As shown in fig. 2 and 5 to 7, fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present invention. Fig. 6 is a schematic view of a perspective view of an insulator according to an embodiment of the present invention. Fig. 7 is a schematic view of another perspective of an insulator according to an embodiment of the present invention. The battery cover plate assembly further includes a second insulating member 630, wherein the second insulating member 630 is accommodated in the groove 120 and disposed between the cover plate body 100 and the terminal 700, so as to insulate the cover plate body 100 from the terminal 700 and prevent the cover plate body 100 from being electrically connected to the terminal 700. The second insulating member 630 is provided with a limiting groove 632, and the terminal 700 is limited in the limiting groove 632 to prevent the second insulating member 630 and the terminal 700 from rotating relatively.

An anti-twisting structure is further provided between the second insulating member 630 and the cap body 100 to prevent the second insulating member 630 from rotating about its axis. The axis of the second insulating member 630 is an axis along the height direction of the cap body 100.

In the related art, a ceramic post is generally provided between the terminal and the cap body to prevent torsion therebetween. However, this design has the problems of complex assembly process and high cost.

According to the battery cover plate assembly provided by the embodiment of the utility model, the torsion-proof structure is arranged between the second insulating part 630 and the cover plate body 100, and the terminal 700 is limited in the limit groove 632, so that the design of a ceramic column is omitted, and the torsion-proof effect can be achieved.

As shown in fig. 4, 6 and 7, the anti-twist structure includes a protrusion 631 and a depression 133 which are engaged. The projection 631 is provided on the second insulating member 630, and the recess 133 is provided on the carrier part 130. When the second insulating member 630 is disposed in the groove 120 of the cap body 100, the projection 631 is inserted into the recess 133, thereby performing a torsion prevention function. Compared with the ceramic column in the related art, the structure is simpler, and the assembly is convenient.

Of course, it is understood that the positions of the projection 631 and the recess 133 may be interchanged, for example, the projection 631 is disposed on the carrier 130 and the recess 133 is disposed on the second insulating member 630.

As shown in fig. 5 to fig. 7, a gap 730 is formed at a joint of the lower surface 710 and the outer peripheral surface 720 of the terminal 700, and the gap 730 is adapted to the bearing portion 130. The second insulating member 630 has a limiting groove 632, and a step portion 633 is disposed at the joint of a groove bottom wall 632a and a groove side wall 632b of the limiting groove 632. The notch 730 of the terminal 700 is adapted to the step 633, i.e. the surface of the second insulating member 630 facing the terminal 700 is adapted to the bottom profile of the terminal 700.

One side surface of the second insulating member 630 facing the cover plate body 100 is adapted to the outer contour of the bearing part 130. Specifically, a recess 634 is formed at a junction of the bottom surface and the outer circumferential surface of the second insulating member 630, and the projection 631 is disposed in the recess 634. When the second insulating member 630 is disposed in the recess 120, the recess 634 fits into the carrier 130, and the protrusion 631 fits into the recess 133.

In another aspect of the present invention, there is also provided a battery including: casing, electric core and any one above-mentioned battery cover plate subassembly. The electric core is arranged in the shell. The battery cover plate assembly covers the shell to seal the battery core in a containing cavity formed by the shell and the battery cover plate assembly.

The battery of the embodiment of the utility model has all the advantages and beneficial effects of any embodiment described above due to the battery cover plate assembly of any embodiment described above, and further description is omitted here.

It is understood that the battery mentioned in the embodiment of the present invention may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, and the embodiment of the present invention is not limited thereto. The battery may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in the embodiments of the present invention.

The battery cell can include a positive plate, a negative plate and a separation film. The positive plate comprises a positive substrate and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive substrate, the positive substrate which is not coated with the positive active substance layer protrudes out of the positive substrate which is coated with the positive active substance layer, and the positive substrate which is not coated with the positive active substance layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode substrate may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative plate comprises a negative substrate and a negative active material layer, the negative active material layer is coated on the surface of the negative substrate, the negative substrate which is not coated with the negative active material layer protrudes out of the negative substrate which is coated with the negative active material layer, and the negative substrate which is not coated with the negative active material layer is used as a negative electrode tab. The material of the negative electrode substrate may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film can be PP or PE, etc.

In addition, the battery cell may have a winding structure or a laminated structure, and the embodiment of the present invention is not limited thereto.

In another aspect of the present invention, a battery pack is further provided, which includes a box body and a plurality of batteries as described above, and the plurality of batteries are disposed in the box body.

The battery pack according to the embodiment of the present invention includes the battery according to any of the above embodiments, so that all the advantages and benefits of any of the above embodiments are provided, and further description is omitted here.

It is understood that the battery pack of the embodiment of the present invention can be applied to various devices using a battery, for example, mobile phones, portable devices, notebook computers, battery cars, electric cars, ships, spacecraft, electric toys, electric tools, and the like. Spacecraft may include aircraft, rockets, space shuttles, and spacecraft, among others. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like. The power tools may include metal cutting power tools, grinding power tools, assembly power tools, and power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers.

The battery pack may further include a bus bar for achieving electrical connection between the plurality of batteries, for example, in parallel or in series-parallel. Specifically, the bus bar may achieve electrical connection between the batteries by connecting the terminals 700 of the batteries. The bus bar may be fixed to the terminal 700 of the battery by welding.

The number of batteries may be set to any number according to different power requirements. Multiple batteries may be connected in series, parallel, or series-parallel to achieve greater capacity or power.

In summary, the battery cover plate assembly, the battery and the battery pack of the embodiment of the utility model have the advantages and beneficial effects that:

In the embodiments of the present invention, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the embodiments of the present invention should be included in the scope of the embodiments of the present invention.

Claims

1. A battery cover plate assembly, comprising:

the cover plate comprises a cover plate body (100) and a supporting part (130), wherein the cover plate body (100) comprises a groove (120) arranged on the upper surface (101) of the cover plate body (100), and the bottom wall (121) and/or the side wall (122) of the groove (120) are/is convexly provided with the supporting part (130); and

and the terminal (700) is arranged in the groove (120), and in the thickness direction of the cover plate body (100), the terminal (700) is at least partially overlapped with the bearing part (130).

2. The battery cover plate assembly according to claim 1, wherein the bearing portion (130) is provided at a junction of the bottom wall (121) and the side wall (122).

3. The battery cover plate assembly of claim 2, wherein the bearing portion (130) comprises a top surface (131) and a side surface (132) that abut;

the top surface (131) is perpendicular to the side wall (122) and the side surface (132) is perpendicular to the bottom wall (121).

4. The battery cover plate assembly of claim 3, wherein the lower surface (710) of the terminal (700) is flush with or lower than the top surface (131) of the carrier (130).

5. The battery cover plate assembly of claim 1, wherein the lower surface (710) of the terminal (700) is flush with or lower than the upper surface (101) of the cover plate body (100).

6. The battery cover plate assembly of claim 1, further comprising an insulating member (630), wherein the insulating member (630) is received in the groove (120) and is disposed between the cover plate body (100) and the terminal (700).

7. The battery cover plate assembly according to claim 6, wherein an anti-twisting structure is further provided between the insulating member (630) and the cover plate body (100) to prevent the insulating member (630) from rotating around its axis;

the insulating part (630) is provided with a limiting groove (632), and the terminal (700) is limited in the limiting groove (632).

8. The battery cover plate assembly of claim 7, wherein the anti-twist structure comprises mating protrusions (631) and depressions (133);

the projection (631) is provided on one of the carrier part (130) and the insulating member (630), and the recess (133) is provided on the other of the carrier part (130) and the insulating member (630).

9. The battery cover plate assembly according to claim 1, wherein a notch (730) is formed at the joint of the lower surface (710) and the outer circumferential surface (720) of the terminal (700), and the notch (730) is matched with the bearing part (130).

10. A battery comprising a battery cover plate assembly according to any one of claims 1 to 9.