Battery top cover and battery monomer

Abstract

The invention belongs to the technical field of batteries, and discloses a battery top cover and a battery monomer. The battery top cover comprises a top cover sheet, a plastic bracket, a pole, a sealing ring and a connecting assembly, the top cover piece is provided with a first mounting hole, the plastic support is attached to the top cover piece, and the plastic support is provided with a second mounting hole. The pole penetrates through the first mounting hole and the second mounting hole; the sealing ring sleeves the pole, at least part of the sealing ring is attached to the top cover piece, and the two sides of the sealing ring abut against the side wall of the pole and the hole wall of the second mounting hole respectively. The connecting assembly abuts against the plastic support, the sealing ring and the pole respectively. A first sinking groove is formed in the surface of one side of the connecting assembly, the first sinking groove extends in the circumferential direction of the second mounting hole, a first insulating part is arranged in the first sinking groove, and the first insulating part abuts against the surface of the junction of the plastic support and the sealing ring so as to seal the junction of the plastic support and the sealing ring; the internal insulation voltage resistance and current resistance of the battery can be improved, and the safety performance of the battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular, to a battery top cover and a battery cell. Background Art

[0002] With the continuous breakthrough of the mileage of new energy vehicles, the requirements for the internal insulation withstand voltage and leakage current of the battery are getting higher and higher, and thus the requirements for the sealing and insulation performance of the battery top cover are also getting higher and higher. As Figure 1 and Figure 2 shown, generally, the battery top cover includes a terminal 1', a pole column 2', an upper plastic 3', a top cover sheet 4', a sealing ring 5', a lower plastic 6' and a bottom plate component 7', etc. The sealing ring 5' is mainly used for sealing and insulating the pole column 2' from the top cover sheet 4' and the bottom plate component 7'. The lower plastic 6' is mainly used for sealing and insulating the top cover sheet 4' and the bottom plate component 7'. In order to improve the insulation and sealing performance of the battery top cover, the sealing ring 5' abuts against the lower plastic 6'. However, despite this, the junction between the sealing ring 5' and the lower plastic 6' is still a risk point for insulation and sealing. Especially at a relatively high voltage (for example, above 1500 volts) and current, the battery is easily broken down at the junction between the lower plastic 6' and the sealing ring 5', resulting in out-of-control internal insulation of the battery and causing the battery to catch fire or explode.

[0003] Therefore, there is an urgent need to propose a battery top cover and a battery cell to solve the above problems. Summary of the Invention

[0004] The first object of the present invention is to provide a battery top cover, which can improve the internal insulation withstand voltage and current resistance of the battery and improve the safety performance of the battery.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A battery top cover, comprising:

[0007] A top cover sheet, on which a first mounting hole is provided;

[0008] A plastic bracket, which is attached to the top cover sheet, and a second mounting hole is provided on the plastic bracket;

[0009] A pole column, which passes through the first mounting hole and the second mounting hole;

[0010] A sealing ring, which is sleeved on the pole column, at least part of the sealing ring is attached to the side of the top cover sheet facing the plastic bracket, and both sides respectively abut against the side wall of the pole column and the hole wall of the second mounting hole;

[0011] A connecting component, the connecting component is located on a side of the plastic bracket away from the top cover sheet, and the connecting component abuts against the plastic bracket, the sealing ring and the pole respectively. A first countersunk groove is provided on a surface of the connecting component facing the plastic bracket, and the first countersunk groove extends along the circumference of the second mounting hole. A first insulating member is provided in the first countersunk groove, and the first insulating member abuts against the surface of the junction between the plastic bracket and the sealing ring to seal the junction between the plastic bracket and the sealing ring.

[0012] As an optional technical solution for the battery top cover, the groove depth of the first recessed groove is H1, and 0.2mm≤H1≤0.5mm.

[0013] As an optional technical solution for the battery top cover, the width of the first recessed groove is B1, and 0.5mm≤B1≤1.0mm.

[0014] As an optional technical solution for the battery top cover, the connecting assembly and the first insulating member are integrally formed by injection molding.

[0015] As an optional technical solution for the battery top cover, the surface flatness of the first insulating member and the connecting assembly is D1, and D1≤0.2mm.

[0016] As an optional technical solution for the battery top cover, a second countersunk groove is provided on the side of the top cover sheet facing the plastic bracket, the second countersunk groove extends along the circumference of the first mounting hole, a second insulating member is provided in the second countersunk groove, and the second insulating member abuts against the surface of the junction between the plastic bracket and the sealing ring to seal the junction between the plastic bracket and the sealing ring.

[0017] As an optional technical solution for the battery top cover, the depth of the second recessed groove is H2, and 0.2mm≤H2≤0.5mm.

[0018] As an optional technical solution for the battery top cover, the width of the second recessed groove is B2, and 0.5mm≤B2≤1.0mm.

[0019] As an optional technical solution for the battery top cover, the top cover sheet and the second insulating member are formed by injection molding.

[0020] A second object of the present invention is to provide a battery cell having strong insulation pressure resistance and high safety performance.

[0021] To achieve this object, the present invention adopts the following technical solutions:

[0022] The battery cell includes a pole group, a battery housing, and the above-mentioned battery top cover. The pole group is located inside the battery housing, and the pole group is electrically connected to the connection component. The top cover plate covers the opening of the battery housing.

[0023] Advantages of the present invention:

[0024] The battery top cover provided by the present invention includes a top cover plate, a plastic bracket, a pole column, a sealing ring, and a connection component. A first sunken groove is provided on the surface of the connection component facing the plastic bracket. The first sunken groove extends along the circumference of the second mounting hole. A first insulating member is provided in the first sunken groove. The first insulating member abuts against the surface at the junction of the plastic bracket and the sealing ring to seal the junction of the plastic bracket and the sealing ring, further insulating and isolating the top cover plate and the connection component, thereby being able to improve the internal insulation withstand voltage and current resistance of the battery and improve the safety performance of the battery. Description of the drawings

[0025] Figure 1 is a partial schematic view of the battery top cover in the background art;

[0026] Figure 2 is Figure 1 an enlarged view at A';

[0027] Figure 3 is a first partial schematic view of the battery top cover provided in the first embodiment of the present invention (the first insulating member is not shown);

[0028] Figure 4 is a second partial schematic view of the battery top cover provided in the first embodiment of the present invention (the first insulating member is shown);

[0029] Figure 5 is an assembly schematic view of the connection component and the first insulating member injection-molded and encapsulated with glue;

[0030] Figure 6 is a first partial schematic view of the battery top cover provided in the second embodiment of the present invention (the second insulating member is not shown);

[0031] Figure 7 is a second partial schematic view of the battery top cover provided in the second embodiment of the present invention (the second insulating member is shown);

[0032] Figure 8 is an assembly schematic view of the top cover plate and the second insulating member injection-molded and encapsulated with glue provided in the second embodiment of the present invention.

[0033] In the figure:

[0034] 1', terminal; 2', pole column; 3', upper plastic; 4', top cover plate; 5', sealing ring; 6', lower plastic; 7', bottom plate component;

[0035] 100. Top cover sheet; 101. Second sunken groove; 200. Plastic bracket; 300. Terminal post; 400. Sealing ring; 500. Connection assembly; 510. Connection piece; 520. Bottom plate; 501. First sunken groove; 600. First insulating part; 601. First glue inlet; 700. Terminal; 800. Upper plastic; 900. Second insulating part; 901. Second glue inlet. Detailed implementation manner

[0036] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0037] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the", and "on the" second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the", and "under the" second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0039] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] Embodiment 1

[0041] The present invention provides a battery top cover, which can improve the internal insulation withstand voltage and current resistance of the battery and enhance the safety performance of the battery.

[0042] Specific as Figure 3 and Figure 4 As shown, the battery top cover includes a top cover sheet 100, a plastic bracket 200, a pole 300, a sealing ring 400 and a connecting assembly 500. A first mounting hole is provided on the top cover sheet 100, and the plastic bracket 200 is attached to the side of the top cover sheet 100 facing the pole group. A second mounting hole is provided on the plastic bracket 200, and the second mounting hole and the first mounting hole are arranged opposite and coaxially. The pole 300 is penetrated by the first mounting hole and the second mounting hole; the sealing ring 400 is sleeved on the pole 300, and at least part of the sealing ring 400 is attached to the side of the top cover sheet 100 facing the plastic bracket 200, and is located in the second mounting hole, and its inner and outer sides are respectively abutted against the side wall of the pole 300 and the hole wall of the second mounting hole. The connecting assembly 500 is located on the side of the plastic bracket 200 away from the top cover sheet 100, and the connecting assembly 500 is respectively abutted against the plastic bracket 200, the sealing ring 400 and the pole 300. A first recessed groove 501 is provided on a surface of one side of the connecting component 500 facing the plastic bracket 200. The first recessed groove 501 extends circumferentially of the second mounting hole. A first insulating member 600 is provided in the first recessed groove 501. The first insulating member 600 is embedded in the first recessed groove 501, and the first insulating member 600 abuts against the surface of the junction between the plastic bracket 200 and the sealing ring 400. That is to say, the first insulating member 600 is arranged across the junction between the plastic bracket 200 and the sealing ring 400 on the side of the plastic bracket 200 and the sealing ring 400 away from the top cover sheet 100 to seal the junction between the plastic bracket 200 and the sealing ring 400.

[0043] Based on the above design, the top cover sheet 100 is provided with a first mounting hole, and the plastic bracket 200 is provided with a second mounting hole, both of which are used for the installation of the pole 300. The top cover sheet 100 plays a role in fixing, sealing, and current conduction, and the plastic bracket 200 is used for insulation and isolation inside the battery. The pole 300 passes through the first mounting hole and the second mounting hole, and both ends of the pole 300 are electrically connected to the outside and the connection component 500 respectively, for the current transmission between the inside and the outside of the battery. The sealing ring 400 is sleeved on the pole 300, and at least part of the sealing ring 400 is attached to the side of the top cover sheet 100 facing the plastic bracket 200 and is located inside the second mounting hole. The inner and outer sides of the sealing ring 400 are respectively abutted against the side wall of the pole 300 and the hole wall of the second mounting hole to insulate and seal the top cover sheet 100 and the pole 300. The connection component 500 is located on the side of the plastic bracket 200 facing away from the top cover sheet 100, and the connection component 500 is respectively abutted against the plastic bracket 200, the sealing ring 400, and the pole 300 for the current transmission inside the battery. A first sunken groove 501 is provided on the surface of the connection component 500 facing the plastic bracket 200. The first sunken groove 501 extends along the circumferential direction of the second mounting hole. A first insulating member 600 is provided in the first sunken groove 501. The first insulating member 600 abuts against the surface at the junction of the plastic bracket 200 and the sealing ring 400 to seal the junction of the plastic bracket 200 and the sealing ring 400, further insulate and isolate the top cover sheet 100 and the connection component 500, thereby improving the internal insulation withstand voltage and current resistance of the battery and enhancing the safety performance of the battery.

[0044] It should be noted that the orthogonal projection of the intersection line of the plastic bracket 200 and the sealing ring 400 on the side facing away from the top cover sheet 100 coincides with the center line of the groove width of the first sunken groove 501.

[0045] Optionally, the groove depth of the first sunken groove 501 is H1, and 0.2 mm ≤ H1 ≤ 0.5 mm, ensuring that it can accommodate at least a first insulating member 600 with a thickness of 0.2 mm - 0.5 mm, thereby ensuring the insulation performance of the first insulating member 600.

[0046] Exemplarily, the groove depth H1 of the first sunken groove 501 can be 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm, etc.

[0047] Optionally, the groove width of the first sunken groove 501 is B1, and 0.5 mm ≤ B1 ≤ 1.0 mm, ensuring that it can accommodate at least a first insulating member 600 with a width of 0.5 mm - 1.0 mm, thereby ensuring that the first insulating member 600 can block the junction of the plastic bracket 200 and the sealing ring 400 and guarantee the insulation performance of the first insulating member 600.

[0048] Exemplarily, the groove width B1 of the first sunken groove 501 can be 0.5 mm, 0.6 mm, 0.8 mm, or 1.0 mm, etc.

[0049] Further, the width of the first insulating member 600 extends L1 from the width center line of the first recessed groove 501 along the groove width direction of the first recessed groove 501 in directions away from each other, and 0.2mm≤L1≤0.5mm. In other words, the extension width of the first insulating member 600 on both sides of the boundary line between the plastic bracket 200 and the sealing ring 400 on the side away from the top cover sheet 100 is 0.2mm-0.5mm, and can be 0.2mm, 0.3mm, 0.4mm or 0.5mm, for example.

[0050] Optionally, the connection assembly 500 and the first insulating member 600 are integrally formed, which is easy to process.

[0051] Preferably, the connection assembly 500 and the first insulating member 600 are integrally formed by injection molding, which has a simple process and can ensure the insulation performance of the first insulating member 600 .

[0052] Furthermore, if Figure 5 As shown, the surface flatness of the first insulating member 600 and the connecting assembly 500 facing the top cover sheet 100 is D1, and D1≤0.2 mm. By way of example, the flatness D1 may be 0.10 mm, 0.15 mm or 0.20 mm.

[0053] In this embodiment, when the first insulating member 600 is injection-molded, the surface height of the first injection port 601 is less than or equal to the surface height of the first insulating member 600 facing the top cover sheet 100 .

[0054] Since injection molding is a mature processing technology, the specific injection molding and encapsulation operation steps of the connecting component 500 and the first insulating component 600 will not be described in detail.

[0055] Continue as Figure 3 and Figure 4 As shown, the connecting component 500 includes a connecting piece 510, a base plate 520 and a pin (not shown in the figure), the base plate 520 is connected to the connecting piece 510, and the connecting piece 510 abuts against the side of the pole 300 and the sealing ring 400 away from the top cover sheet 100, the base plate 520 abuts against the side of the plastic bracket 200 and the sealing ring 400 away from the top cover sheet 100, the pin is connected to the edge of the base plate 520 and extends in a direction away from the top cover sheet 100, and the first recessed groove 501 is located on the base plate 520.

[0056] Furthermore, the battery top cover also includes a pin membrane (not shown in the figure), which is attached to the side of the connection component 500 away from the top cover sheet 100, and the pins are inserted through the pin membrane, which is an insulating design inside the battery.

[0057] The battery top cover also includes a terminal 700 and an upper plastic 800. The terminal 700 is sleeved on the pole 300 and is located on the side of the top cover sheet 100 away from the plastic bracket 200, and is riveted and welded to the pole 300; the upper plastic 800 is wrapped around the periphery of the terminal 700, and is at least partially sandwiched between the terminal 700 and the top cover sheet 100 and between the pole 300 and the top cover sheet 100.

[0058] It should be noted that, in this embodiment, the number of the pole 300, the terminal 700, the upper plastic 800, the sealing ring 400, the first mounting hole, the second mounting hole, the first insulating member 600 and the first recessed groove 501 are two and correspond to each other. One of the two poles 300 is a positive pole and the other is a negative pole. The assembly of the pole 300, the terminal 700 and the upper plastic 800 is a prior art and will not be described in detail here.

[0059] This embodiment also provides a battery cell having strong insulation pressure resistance and high safety performance.

[0060] Specifically, the battery cell includes a pole group, a battery shell and the battery top cover, the pole group is located in the battery shell, and the pole group is electrically connected to the connection assembly 500, and the top cover sheet 100 is covered at the opening of the battery shell. Since the insulation and pressure resistance of the battery top cover are strong, the safety performance of the battery cell is high.

[0061] Embodiment 2

[0062] This embodiment provides a battery top cover, which is different from the battery top cover provided in the first embodiment in that:

[0063] Specific as Figure 6 and Figure 7 As shown, a second recessed groove 101 is provided on the side of the top cover sheet 100 of the battery top cover facing the plastic bracket 200, and the second recessed groove 101 extends along the circumference of the first mounting hole. A second insulating member 900 is provided in the second recessed groove 101, and the second insulating member 900 abuts against the surface of the junction between the plastic bracket 200 and the sealing ring 400 to seal the junction between the plastic bracket 200 and the sealing ring 400, that is, the second insulating member 900 is arranged across the junction between the plastic bracket 200 and the sealing ring 400 on the side of the plastic bracket 200 and the sealing ring 400 facing the top cover sheet 100, so as to seal the junction between the plastic bracket 200 and the sealing ring 400, and both ends of the gap at the junction of the sealed plastic bracket 200 and the sealing ring 400 (one end facing the top cover sheet 100 and the other end facing the connecting component 500) are blocked, thereby further insulating and isolating the top cover sheet 100 and the connecting component 500.

[0064] Further, the groove depth of the second sunken groove 101 is H2, and 0.2 mm ≤ H2 ≤ 0.5 mm, ensuring that the second insulating member 900 with a thickness of at least 0.2 mm - 0.5 mm can be accommodated, thereby ensuring the insulation performance of the second insulating member 900.

[0065] Exemplarily, the groove depth H2 of the second sunken groove 101 can be 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm, etc.

[0066] Optionally, the groove width of the second sunken groove 101 is B2, and 0.5 mm ≤ B2 ≤ 1.0 mm, ensuring that the second insulating member 900 with a width of at least 0.5 mm - 1.0 mm can be accommodated, thereby ensuring that the second insulating member 900 can block the junction between the plastic bracket 200 and the sealing ring 400 and guaranteeing the insulation performance of the second insulating member 900.

[0067] Exemplarily, the groove width B2 of the second sunken groove 101 can be 0.5 mm, 0.6 mm, 0.8 mm or 1.0 mm, etc.

[0068] Further, both sides of the width of the second insulating member 900 extend by L2 in the groove width direction of the second sunken groove 101 from the width midline of the second sunken groove 101 in opposite directions, and 0.2 mm ≤ L2 ≤ 0.5 mm. That is to say, the extension widths of the second insulating member 900 on both sides of the junction line between the plastic bracket 200 and the sealing ring 400 on the side facing the top cover sheet 100 are 0.2 mm - 0.5 mm respectively. Exemplarily, it can be 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm.

[0069] Optionally, the top cover sheet 100 and the second insulating member 900 are integrally formed, which is simple to process.

[0070] Preferably, the top cover sheet 100 and the second insulating member 900 are integrally formed by injection molding and encapsulation, with a simple process and can ensure the insulation performance of the second insulating member 900.

[0071] As Figure 8 shown, further, the surface flatness of the second insulating member 900 and the top cover sheet 100 on the side facing the plastic bracket 200 is D2, and D2 ≤ 0.2 mm. Exemplarily, the above flatness D2 can be 0.10 mm, 0.15 mm or 0.20 mm, etc.

[0072] In this embodiment, when the second insulating member 900 is injection molded, the height of the second glue inlet 901 is less than or equal to the surface height of the second insulating member 900 on the side facing the plastic bracket 200.

[0073] The remaining structures of the battery top cover provided in this embodiment are the same as those in Embodiment 1 and will not be described in detail.

[0074] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. Battery top cover, characterized in that, include: A top cover sheet (100), wherein the top cover sheet (100) is provided with a first mounting hole; A plastic bracket (200), the plastic bracket (200) being attached to the top cover sheet (100), and a second mounting hole being provided on the plastic bracket (200); A pole (300), wherein the first mounting hole and the second mounting hole are formed through the pole (300); A sealing ring (400), wherein the sealing ring (400) is sleeved on the pole (300), and at least a portion of the sealing ring (400) is attached to a side of the top cover sheet (100) facing the plastic bracket (200), and two sides of the sealing ring (400) are respectively in contact with a side wall of the pole (300) and a hole wall of the second mounting hole; A connecting component (500), the connecting component (500) is located on a side of the plastic support (200) away from the top cover sheet (100), and the connecting component (500) is respectively in contact with the plastic support (200), the sealing ring (400) and the pole (300), and a first recessed groove (501) is provided on a surface of the connecting component (500) facing the plastic support (200), the first recessed groove (501) extends along the circumference of the second mounting hole, a first insulating member (600) is provided in the first recessed groove (501), and the first insulating member (600) is in contact with the surface of the junction between the plastic support (200) and the sealing ring (400) to seal the junction between the plastic support (200) and the sealing ring (400).

2. The battery top cover according to claim 1, characterized in that: The first recessed groove (501) has a depth of H1, and 0.2 mm ≤ H1 ≤ 0.5 mm.

3. The battery top cover according to claim 1, characterized in that: The groove width of the first recessed groove (501) is B1, and 0.5mm≤B1≤1.0mm.

4. The battery top cover according to claim 1, characterized in that: The connection assembly (500) and the first insulating member (600) are integrally formed by injection molding.

5. The battery top cover according to claim 4, characterized in that: The surface flatness of the first insulating member (600) and the connecting assembly (500) is D1, and D1≤0.2 mm.

6. The battery top cover according to claim 1, characterized in that: A second recessed groove (101) is provided on a side of the top cover sheet (100) facing the plastic bracket (200), and the second recessed groove (101) extends along the circumference of the first mounting hole. A second insulating member (900) is provided in the second recessed groove (101), and the second insulating member (900) abuts against the surface of the junction between the plastic bracket (200) and the sealing ring (400) to seal the junction between the plastic bracket (200) and the sealing ring (400).

7. The battery top cover according to claim 6, characterized in that: The groove depth of the second recessed groove (101) is H2, and 0.2mm≤H2≤0.5mm.

8. The battery top cover according to claim 6, characterized in that: The groove width of the second sink groove (101) is B2, and 0.5mm≤B2≤1.0mm.

9. The battery top cover according to claim 6, characterized in that: The top cover sheet (100) and the second insulating member (900) are formed by injection molding.

10. A battery cell, characterized in that: It comprises a pole group, a battery shell and a battery top cover according to any one of claims 1 to 9, wherein the pole group is located in the battery shell and is electrically connected to the connecting component (500), and the top cover sheet (100) is covered at the opening of the battery shell.

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