Battery cell top cover and top cover assembly

Abstract

The utility model provides a battery cell top cover and a top cover assembly, the battery cell top cover comprises a top cover body, the outer side of the top cover body is provided with a mounting groove which is arranged along with an output pole block, the mounting groove is used for mounting the output pole block, the cross section of the mounting groove is polygonal or elliptical, the groove bottom of the mounting groove is provided with a pole mounting hole, and the pole mounting hole is provided with an opening. The top cover body is provided with a limiting bulge which is arranged along at least part of the circumferential direction of the notch of the mounting groove and can limit the rotation of the output pole block relative to the mounting groove. According to the battery cell top cover disclosed by the utility model, the top cover body is provided with the limiting bulge which is arranged along at least part of the circumferential direction of the notch of the mounting groove, and the limiting bulge can limit the rotation of the output pole block relative to the mounting groove; the problem of poor performance of the lithium battery caused by mounting dislocation of the output pole block and stress rotation of the output pole block during use of the battery cell can be prevented, and a traditional positioning column for positioning the output pole block can be omitted, so that the number of parts can be reduced, the production cost can be reduced, the assembly process can be simplified, and the assembly efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a cell top cover; at the same time, the utility model also relates to a top cover assembly provided with the cell top cover. Background Art

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the use performance and safety of lithium-ion batteries are increasing day by day. As a component in a lithium-ion battery, the lithium battery top cover first plays a sealing role by isolating the internal and external environments after being welded to the aluminum shell, and secondly connects the internal and external circuits, and conveys the current inside the battery to the outside through the top cover pole column, playing a role in guiding the current.

[0003] The traditional top cover generally mainly consists of a top cover, positive and negative pole columns, positive and negative output pole blocks and insulating sleeves arranged on both of them, a lower plastic part arranged on the inner side of the top cover, and an explosion-proof valve arranged on the top cover, etc. The most commonly used top cover structure at present uses a ceramic column arranged between the output pole block and the top cover for positioning. This not only increases the number of structural parts, resulting in an increase in cost, thus leading to high requirements for assembly accuracy, and further increasing the control cost. Summary of the Utility Model

[0004] In view of this, the utility model aims to propose a cell top cover to facilitate the installation of the output pole block.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] A cell top cover includes a top cover body. An installation groove is arranged on the outer side of the top cover body and is shaped following the output pole block for installing the output pole block, and the cross-section is polygonal or elliptical. A pole column installation hole is arranged at the bottom of the installation groove. An outer convex and a limiting protrusion are arranged on the top cover body and at least partially circumferentially arranged along the notch of the installation groove. The limiting protrusion can limit the rotation of the output pole block relative to the installation groove.

[0007] Further, the limiting protrusion is arranged circumferentially along the installation groove and encloses and forms a limiting groove communicating with the installation groove.

[0008] Further, the free end of the limiting protrusion is provided with an inclined guiding surface for guiding the output pole block into the installation groove.

[0009] Further, the thickness a of the top cover body satisfies: a≥3mm, and / or, the height b of the limiting protrusion satisfies: b≥1mm.

[0010] Further, an identification portion for identifying the polarity of the output pole block is provided on the top cover body.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] For the battery cell top cover of the utility model, by arranging the installation groove to follow the shape of the output pole block, the cross-section of the installation groove is polygonal or elliptical, and a limiting protrusion is arranged on the top cover body at least partially circumferentially along the notch of the installation groove, the rotation of the output pole block relative to the installation groove can be restricted by the limiting protrusion, which is beneficial to preventing the installation misalignment of the output pole block and the problem of poor performance of the lithium battery caused by the rotation of the output pole block under force during the use of the battery cell. The positioning posts for positioning the output pole block in the traditional way can be cancelled, so that the number of parts can be reduced, the production cost can be lowered, and the assembly process can be simplified, which is further beneficial to improving the assembly efficiency.

[0013] In addition, the limiting protrusion is arranged circumferentially along the installation groove and encloses a limiting groove communicated with the installation groove, which is beneficial to further improving the limiting effect on the output pole block, and is also beneficial to preventing the electrolyte from flowing into the installation groove during the injection through the liquid injection hole, and is beneficial to preventing the risk of poor creepage insulation, thereby further improving the safety of the battery cell. By arranging a guiding surface on the limiting protrusion, it is beneficial to improving the convenience of installing the output pole block. The setting of the value range of the thickness a of the top cover body is beneficial to improving the safety of the top cover body; the setting of the range of the height b of the limiting protrusion is beneficial to ensuring the limiting effect of the limiting protrusion. The setting of the identification portion on the top cover body is beneficial to identifying the polarity of the output pole block.

[0014] In addition, another object of the utility model is to provide a top cover assembly, which includes the battery cell top cover as described above, a lower plastic plate arranged inside the top cover body, an output pole block arranged in the installation groove, a pole column arranged inside the top cover body and connected with the output pole block, and an insulating sleeve for separating the output pole block and the installation groove is arranged between the output pole block and the installation groove.

[0015] Further, the insulating sleeve has a first part between the bottom of the output pole block and the bottom of the installation groove, and a second part between the outer periphery of the output pole block and the groove wall of the installation groove, and the second part extends out of the installation groove.

[0016] Further, the length c of the second part extending out of the installation groove satisfies: c≥1mm.

[0017] Further, the gap d between the circumferences of the second part and the installation groove satisfies: 0≤d≤0.5mm.

[0018] Further, an explosion-proof valve is also arranged on the top cover body.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] For the top cover assembly of the utility model, by providing the battery cell top cover as above, it is beneficial to improve the installation effect of the output pole block on the top cover body, prevent the output pole block from rotating relative to the top cover body, and at the same time, by providing the insulating sleeve, it is beneficial to improve the safety of the top cover assembly.

[0021] In addition, the setting of the first part and the second part on the insulating sleeve is beneficial to ensure the insulation effect between the output pole block and the top cover body. The range of the length that the second part extends out of the installation groove is beneficial to avoid short circuit caused by foreign object lap between the output pole block and the limiting protrusion. The setting of the clearance range between the second part and the installation groove is beneficial to the installation of the output pole block and the insulating sleeve. By providing the explosion-proof valve on the top cover body, it is beneficial to improve the safety of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0023] Figure 1 is a schematic structural diagram of the battery cell top cover according to Embodiment 1 of the present utility model;

[0024] Figure 2 is a partial cross-sectional view of the battery cell top cover according to Embodiment 1 of the present utility model;

[0025] Figure 3 is an exploded view of the top cover assembly according to Embodiment 2 of the present utility model;

[0026] Figure 4 is a schematic structural diagram of the top cover assembly according to Embodiment 2 of the present utility model;

[0027] Figure 5 is a top view of the top cover assembly according to Embodiment 2 of the present utility model;

[0028] Figure 6 is Figure 5 a cross-sectional view taken along the A-A direction in

[0029] Description of the reference numerals:

[0030] 1. Top cover body; 2. Explosion-proof valve; 3. Lower plastic plate; 4. Terminal; 5. Output pole block; 6. Insulating sleeve;

[0031] 100. Terminal installation hole; 101. Installation groove; 102. Limiting protrusion; 103. Marking part; 104. Liquid injection hole; 105. Guide surface;

[0032] 601. First part; 602. Second part. Detailed implementation mode

[0033] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0034] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0036] Embodiment 1

[0037] This embodiment relates to a cell top cover to solve the problems in the prior art that the output pole block 5 is only positioned on the top cover body 1 through ceramic positioning posts, resulting in a large number of parts, high production costs and low assembly efficiency.

[0038] In terms of the overall composition, the cell top cover includes a top cover body 1. An installation groove 101 is provided on the outer side of the top cover body 1 and is shaped following the output pole block 5. The installation groove 101 is used to install the output pole block 5 and has a cross-section in a polygon or an ellipse. A pole column installation hole 100 is provided at the bottom of the installation groove 101. A limiting protrusion 102 is provided on the top cover body 1 and is arranged at least partially circumferentially along the notch of the installation groove 101. The limiting protrusion 102 can limit the rotation of the output pole block 5 relative to the installation groove 101.

[0039] For the cell top cover described in this embodiment, by setting the installation groove 101 to be shaped following the output pole block 5, the cross-section of the installation groove 101 is in a polygon or an ellipse, and a limiting protrusion 102 is provided on the top cover body 1 and is arranged at least partially circumferentially along the notch of the installation groove 101, the rotation of the output pole block 5 relative to the installation groove 101 can be limited by the limiting protrusion 102, which is beneficial to preventing the output pole block 5 from being misaligned during installation and the problem that the output pole block 5 rotates under force during the use of the cell, resulting in poor performance of the lithium battery. The positioning posts for positioning the output pole block 5 in the traditional way can be cancelled, so that the number of parts can be reduced, the production cost can be lowered, and it is also beneficial to simplify the assembly process, and thus beneficial to improving the assembly efficiency.

[0040] Based on the above overall introduction, an exemplary structure of the cell top cover shown in this embodiment is as Figure 1 andFigure 2 As shown in the figure. Herein, the outer side of the top cover body 1 refers to the side facing outside the housing when the battery cell top cover is installed on the housing, and the inner side of the top cover body 1 refers to the side facing inside the housing. In this embodiment, there are two mounting grooves 101 provided on the outer sides of both ends of the top cover body 1. One mounting groove 101 is used to mount the positive output terminal block 5, and the other mounting groove 101 is used to mount the positive output terminal block 5. Of course, in specific implementation, the number of the mounting grooves 101 can also be set to one according to the usage requirements.

[0041] In specific implementation, an insulating sleeve 6 is specifically sleeved outside the output terminal block 5. In the installed state, the insulating sleeve 6 is located between the output terminal block 5 and the mounting groove 101. The limiting protrusion 102 is specifically in contact with the insulating sleeve 6, thereby restricting the rotation of the output terminal block 5 relative to the mounting groove 101. In addition, a liquid injection hole 104 is also provided between the two mounting grooves 101 to facilitate the injection of the electrolyte.

[0042] As Figure 1 shown in the figure, in this embodiment, the shape of the mounting groove 101 is preferably rectangular. Of course, in addition to being rectangular as shown in the figure, the mounting groove 101 can also be square, or other polygons or ellipses, to facilitate cooperating with the limiting protrusion 102 to prevent the output terminal block 5 from rotating relative to the mounting groove 101.

[0043] As a preferred implementation manner, as Figure 1 shown in the figure, the limiting protrusion 102 is arranged along the circumferential direction of the mounting groove 101 and encloses a limiting groove communicating with the mounting groove 101. The limiting groove formed by the limiting protrusion 102 herein confines the output terminal block 5 in the limiting groove and the mounting groove 101, which is beneficial to further improving the limiting effect on the output terminal block 5. With such a setting, when the output terminal block 5 rotates relative to the mounting groove 101, it can be blocked by the limiting protrusion 102, which is beneficial to further improving the limiting effect on the output terminal block 5. It is also beneficial to prevent the electrolyte from flowing into the mounting groove 101 during the injection through the liquid injection hole 104, and to prevent the risk of poor insulation due to creepage, thereby further improving the safety of the battery cell.

[0044] It should be particularly noted that in this embodiment, in addition to being arranged along the entire circumferential direction of the mounting groove 101, the limiting protrusion 102 can also be arranged only corresponding to the four corners of the mounting groove 101. Each limiting protrusion 102 is in an "L" shape. When the output terminal block 5 rotates relative to the mounting groove 101, it can still be blocked by the limiting protrusion 102, so that the output terminal block 5 cannot rotate relative to the mounting groove 101. Of course, the scheme of arranging the limiting protrusions 102 at two diagonal corners of the mounting groove 101 is also feasible.

[0045] To improve the installation effect of the output terminal block 5 in the mounting groove 101, as Figure 2As shown in the figure, the free end of the limit projection 102 is provided with an inclined guiding surface 105 for guiding the output pole block 5 to be inserted into the installation groove 101. By providing the guiding surface 105 on the limit projection 102, it is beneficial to improve the convenience of installing the output pole block 5. In specific implementation, the guiding surface 105 can be formed by chamfering the end of the limit projection 102, and the chamfer length is between 0 and 0.5 mm. For example, the chamfer length can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm, etc.

[0046] In addition, still referring to Figure 2 As shown in the figure, in this embodiment, the thickness a of the top cover body 1 satisfies: a ≥ 3 mm, which is beneficial to improving the safety of the top cover body 1. In addition, the height b of the limit projection 102 satisfies: b ≥ 1 mm, so as to ensure the limiting effect of the limit projection 102 and the blocking effect on the electrolyte. In specific implementation, the thickness a of the top cover body 1 can be 3 mm, 3.5 mm, 4 mm or 4.5 mm. The height b of the limit projection 102 can be 1 mm, 1.2 mm, 1.5 mm or 1.8 mm. In specific implementation, the thickness a and the height b can be determined according to the usage requirements.

[0047] To improve the safety of the battery cell top cover, in this embodiment, the top cover body 1 is provided with an identification part 103 for identifying the polarity of the output pole block 5. In specific implementation, the identification part 103 can be “﹢” or “﹣”, which is convenient for layout implementation and has a good identification effect, thus being beneficial to identifying the polarity of the output pole block 5. Of course, in addition to using symbols, the identification part 103 can also adopt other structures with identification effects such as words.

[0048] For the battery cell top cover in this embodiment, by optimizing the structure of the top cover body 1 and setting the limit projection 102, not only the ceramic positioning posts are omitted, but also the number of structural parts, the cost and the assembly process can be reduced, which is beneficial to improving the assembly efficiency. Moreover, the mating dimensions can also be reduced, which is beneficial to the control and the positioning reliability of the output pole block 5. At the same time, the limit projection 102 is also beneficial to avoiding the risk of creepage insulation failure caused by the electrolyte flowing into the installation groove 101.

[0049] Embodiment Two

[0050] This embodiment relates to a top cover assembly. In terms of the overall composition, as Figure 3 shown in the figure, this top cover assembly includes the battery cell top cover as above, a lower plastic plate 3 arranged inside the top cover body 1, an output pole block 5 arranged in the installation groove 101, a pole column 4 arranged inside the top cover body 1 and connected to the output pole block 5, and an insulating sleeve 6 arranged between the output pole block 5 and the installation groove 101 to separate the two.

[0051] Among them, the terminal post 4 has a bottom plate and a column body provided on the bottom plate, which passes through the terminal post mounting hole 100 and is arranged such that the bottom plate is located inside the top cover body 1. A riveting hole is provided on the output pole piece 5, and the column body is specifically riveted to the output pole piece 5 through the riveting hole, thereby realizing the electrical connection between the terminal post 4 and the output pole piece 5, and further enabling the electrical connection between the pole group and the output pole piece 5.

[0052] As a preferred embodiment, the insulating sleeve 6 has a first part 601 provided between the bottom of the output pole piece 5 and the bottom of the mounting groove 101, and a second part 602 provided between the outer periphery of the output pole piece 5 and the groove wall of the mounting groove 101, and the second part 602 extends out of the mounting groove 101. Among them, the insulating sleeve 6 is arranged conforming to the output pole piece 5, and a through hole for the column body to pass through is provided on the first part 601. In this embodiment, the arrangement of the first part 601 and the second part 602 on the insulating sleeve 6 is beneficial to ensuring the insulation effect between the output pole piece 5 and the top cover body 1, and the structure of the insulating sleeve 6 is simple and convenient for layout and implementation.

[0053] As Figure 5 and Figure 6 shown in

[0054] and

[0055] As Figure 4 and Figure 5 shown in

[0056] For the top cover assembly described in this embodiment, by providing the battery cell top cover as above, it is beneficial to improve the installation effect of the output pole block 5 on the top cover body 1, prevent the output pole block 5 from rotating relative to the top cover body 1, and at the same time, by providing the insulating sleeve 6, it is beneficial to improve the safety of the top cover assembly.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A battery cell top cover, characterized in that: It includes a top cover body, the outer side of the top cover body is provided with a mounting groove which is arranged in the shape of the output pole block, the mounting groove is used to install the output pole block, and the cross-section is polygonal or elliptical, the bottom of the mounting groove is provided with a pole mounting hole, the top cover body is provided with an external protrusion, and a limiting protrusion is arranged at least partially circumferentially along the notch of the mounting groove, and the limiting protrusion can limit the rotation of the output pole block relative to the mounting groove.

2. The battery cell top cover according to claim 1, characterized in that: The limiting protrusions are arranged along the circumference of the mounting groove and surround a limiting groove that is communicated with the mounting groove.

3. The battery cell top cover according to claim 1, characterized in that: The free end of the limiting protrusion is provided with an inclined guiding surface, and the guiding surface is used to guide the output pole block to be installed into the mounting groove.

4. The battery cell top cover according to claim 1, characterized in that: The thickness a of the top cover body satisfies: a≥3mm, and / or, The height b of the limiting protrusion satisfies: b≥1mm.

5. The battery cell top cover according to any one of claims 1 to 4, characterized in that: The top cover body is provided with an identification portion for identifying the polarity of the output pole block.

6. A top cover assembly, characterized in that: It comprises the battery cell top cover according to any one of claims 1 to 5, a lower plastic plate arranged on the inner side of the top cover body, an output pole block arranged in the mounting groove, a pole arranged on the inner side of the top cover body and connected to the output pole block, and an insulating sleeve is provided between the output pole block and the mounting groove to separate the two.

7. The top cover assembly according to claim 6, characterized in that: The insulating sleeve has a first portion disposed between the bottom of the output pole block and the bottom of the mounting groove, and a second portion disposed between the outer periphery of the output pole block and the wall of the mounting groove, and the second portion extends out of the mounting groove.

8. The top cover assembly according to claim 7, characterized in that: A length c of the second portion extending out of the mounting groove satisfies: c≥1 mm.

9. The top cover assembly according to claim 7, characterized in that: A gap d between the second portion and the mounting groove in the circumferential direction satisfies: 0≤d≤0.5 mm.

10. The top cover assembly according to any one of claims 6 to 9, characterized in that: It also includes an explosion-proof valve arranged on the top cover body.

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