Top cover assembly, single battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and discloses a top cover assembly, a single battery and electric equipment. The top cover assembly comprises a top cover body, a pole terminal, an insulating sealing ring and an insulating part, wherein the top cover body is provided with a mounting hole; the pole terminal is inserted into the mounting hole, and the top of the pole terminal comprises a connecting part exceeding the mounting hole in the radial direction; the insulating sealing ring is clamped between the pole terminal and the mounting hole; the insulating part is clamped between the bottom wall of the connecting part and the top wall of the top cover body; the insulating part comprises at least one insulating layer and at least one temperature-resistant layer which are stacked in the height direction, and the heat resistance of the temperature-resistant layer is higher than that of the insulating layer. According to the top cover assembly, the reliability of insulation between the pole terminal and the top cover body can be ensured, the whole insulating part does not need to be made of a temperature-resistant layer, the high-temperature resistance of the battery shell is realized at low cost, the insulating property of the battery shell is improved, and the use safety and reliability of the top cover assembly are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a top cover assembly, a single cell battery and an electrical equipment. Background Art

[0002] The battery housing is an essential part of a cylindrical battery, which is used to accommodate the core package assembly and the pole column assembly of the battery. The pole column assembly is used to connect with electronic components, sensors or connectors to realize the external discharge function of the cylindrical battery. At the same time, the insulation connection between the pole column assembly and the battery housing is often achieved through an upper plastic part to avoid unsafe phenomena such as short circuits in the cylindrical battery.

[0003] Since cylindrical batteries are developing towards high energy density and high charge-discharge power, the current intensity of the pole column assembly is large in a short time and the usage frequency is high. Therefore, the heat generation of the pole column assembly is relatively high. Therefore, while ensuring good insulation between the pole column assembly and the battery housing, it is also required that the battery top cover assembly, the pole column assembly and the upper plastic part have certain high temperature resistance and aging resistance. The existing upper plastic part can only ensure stable insulation performance below 300 °C, while the insulation performance of the plastic part will drop significantly above 300 °C, and even the upper plastic part will melt at a temperature above a certain level, resulting in poor insulation or even short circuit. To improve the heat resistance of the upper plastic part so that it can withstand temperatures above 500 °C and maintain insulation stability under a high-voltage test of more than 2.5 kV, a special ceramic high-temperature resistant material needs to be used to make the upper plastic part, which will undoubtedly increase the manufacturing cost of the upper plastic part.

[0004] Therefore, there is an urgent need to provide a new type of top cover assembly, single cell battery and electrical equipment to solve the above technical problems in the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a top cover assembly, which can achieve the high temperature resistance of the battery housing at low cost, and its insulation performance is improved, thereby improving the use safety and reliability of the top cover assembly.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] The top cover assembly includes a top cover body, a pole terminal, an insulating sealing ring and an insulating part. The top cover body is provided with an installation hole; the pole terminal is inserted into the installation hole, and the top of the pole terminal includes a connecting part that extends radially beyond the installation hole; the insulating sealing ring is clamped between the pole terminal and the installation hole; the insulating part is clamped between the bottom wall of the connecting part and the top wall of the top cover body; the insulating part includes at least 1 insulating layer and at least 1 temperature-resistant layer stacked along the height direction, and the heat resistance of the temperature-resistant layer is higher than that of the insulating layer.

[0008] Optionally, the above-mentioned insulating sealing ring includes a first part and a second part that are perpendicular to each other. The first part is clamped between the pole terminal and the circumferential inner wall of the mounting hole, and the second part abuts against the bottom wall of the top cover body.

[0009] Optionally, the top wall of the first part extends beyond the top wall of the top cover body, so that at least part of the insulating part abuts against the outer circumferential wall of the first part.

[0010] Optionally, the insulating part includes a layer of insulating layer and a layer of temperature-resistant layer stacked up and down, and the thickness of the temperature-resistant layer is not less than 0.3 mm.

[0011] Optionally, the top wall of the first part is higher than the top wall of the temperature-resistant layer, and the top wall of the first part is not higher than the top wall of the insulating layer.

[0012] Optionally, the bottom of the pole terminal includes a contact portion that extends radially beyond the mounting hole, and the second part is clamped between the contact portion and the top cover body.

[0013] Optionally, the insulating layer is made of any one of polyphenylene sulfide parts, liquid crystal polymer parts, polyether ether ketone parts, and soluble polytetrafluoroethylene parts.

[0014] Optionally, the temperature-resistant layer is made of any one of ceramic parts, mica parts, and silicone rubber parts.

[0015] Another object of the present utility model is to provide a single cell, which includes the top cover assembly described in any of the above solutions.

[0016] Still another object of the present utility model is to provide an electrical device, which includes the single cell described in the above solution.

[0017] Beneficial effects:

[0018] In the top cover assembly of the present utility model, by opening an installation hole on the top cover body, inserting the pole terminal into the installation hole, and using an insulating sealing ring to clamp between the pole terminal and the installation hole, a sealed and insulated connection between the pole terminal and the top cover body is achieved. At the same time, an insulating member is clamped between the connection part at the top of the pole terminal and the top wall of the top cover body. The insulating member is made by laminating an insulating layer and a heat-resistant layer. When the top cover assembly is placed in a high-temperature environment, since the heat resistance of the heat-resistant layer is higher than that of the insulating layer, even if the insulating layer is damaged or fails at high temperature, the heat-resistant layer can still maintain good insulating performance, preventing the pole terminal from contacting the top cover body due to the damage of the insulating layer, ensuring the reliability of insulation between the pole terminal and the top cover body, and without making the entire insulating member made of the heat-resistant layer, achieving the high-temperature resistance performance of the battery case at low cost, and improving its insulating performance, thus enhancing the use safety and reliability of the top cover assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an axonometric view of a single cell provided by the specific embodiment of the present utility model;

[0020] Figure 2 is a longitudinal sectional view of the single cell with the battery core hidden provided by the specific embodiment of the present utility model;

[0021] Figure 3 is Figure 2 a partial enlarged view of part A in

[0022] In the figure:

[0023] 100, top cover body; 110, installation hole; 120, lower housing; 200, pole terminal; 210, connection part; 220, abutting part; 300, insulating sealing ring; 310, first part; 320, second part; 400, insulating member; 410, insulating layer; 420, heat-resistant layer. SPECIFIC EMBODIMENTS

[0024] The present utility model 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 utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model are shown in the drawings, rather than all the structures.

[0025] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] In the present utility model, 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", "over", 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", "beneath", 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.

[0027] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, 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, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0028] Please refer to Figure 1 and Figure 2 , the top cover assembly in this embodiment is used for cylindrical batteries, and its top cover body 100 is actually integrally formed with the lower shell 120, and the lower shell 120 is provided with a through hole for the battery core to be placed. Of course, this top cover assembly can also be applied to square batteries, and only the specific structure of the top cover assembly described in this embodiment needs to be adopted. The top cover assembly is directly installed on the bottom shell of the square battery, which will not be elaborated here. Next, the specific structure of the top cover assembly in this embodiment will be described in detail with reference to Figure 2 and Figure 3 in detail.

[0029] As Figure 2 and Figure 3As shown in the figure, the top cover assembly includes a top cover body 100, a pole terminal 200, an insulating sealing ring 300, and an insulating part 400. The top cover body 100 is provided with a mounting hole 110; the pole terminal 200 is inserted into the mounting hole 110, and the top of the pole terminal 200 includes a connecting portion 210 that extends radially beyond the mounting hole 110; the insulating sealing ring 300 is clamped between the pole terminal 200 and the mounting hole 110; the insulating part 400 is clamped between the bottom wall of the connecting portion 210 and the top wall of the top cover body 100; the insulating part 400 includes at least one insulating layer 410 and at least one heat-resistant layer 420 that are stacked in the height direction, and the heat resistance of the heat-resistant layer 420 is higher than that of the insulating layer 410.

[0030] In the top cover assembly of this embodiment, by providing a mounting hole 110 in the top cover body 100 and inserting the pole terminal 200 into the mounting hole 110, and at the same time using the insulating sealing ring 300 to be clamped between the pole terminal 200 and the mounting hole 110, a sealed and insulated connection between the pole terminal 200 and the top cover body 100 is achieved; at the same time, an insulating part 400 is clamped between the connecting portion 210 at the top of the pole terminal 200 and the top wall of the top cover body 100. The insulating part 400 is made by stacking the insulating layer 410 and the heat-resistant layer 420. When the top cover assembly is placed in a high-temperature environment, since the heat resistance of the heat-resistant layer 420 is higher than that of the insulating layer 410, even if the insulating layer 410 is damaged or fails at high temperatures, the heat-resistant layer can still maintain good insulation performance, preventing the pole terminal 200 from contacting the top cover body 100 due to the damage of the insulating layer 410, ensuring the reliability of the insulation between the pole terminal 200 and the top cover body 100. And it is not necessary to make the entire insulating part 400 from the heat-resistant layer 420, achieving the high-temperature resistance performance of the battery housing at low cost, and improving its insulation performance, thereby enhancing the use safety and reliability of the top cover assembly.

[0031] As Figure 3 shown in the figure, the insulating sealing ring 300 includes a first part 310 and a second part 320 that are perpendicular to each other. The first part 310 is clamped between the pole terminal 200 and the circumferential inner wall of the mounting hole 110, and the second part 320 abuts against the bottom wall of the top cover body 100. Thus, the longitudinal section of the insulating sealing ring 300 is L-shaped, achieving multiple seals between the insulating sealing ring 300 and the mounting hole 110 as well as the top cover body 100, and improving the insulation and sealing effects.

[0032] Furthermore, the top wall of the first part 310 extends beyond the top wall of the top cover body 100, so that at least part of the insulating member 400 abuts against the circumferential outer wall of the first part 310. Since the top wall of the first part 310 extends beyond the top wall of the top cover body 100, an insulating and sealing connection can be formed between the insulating member 400 and the first part 310 of the insulating sealing ring 300, improving the insulation effect between the pole terminal 200 and the top cover body 100. Moreover, the insulating sealing ring 300 also positions and limits the position of the insulating member 400, ensuring the fixing effect of the insulating member 400.

[0033] In this embodiment, the insulating member 400 includes a layer of insulating layer 410 and a layer of heat-resistant layer 420 stacked up and down. The thickness of the heat-resistant layer 420 is not less than 0.3 mm. If the thickness of the heat-resistant layer 420 is less than 0.3 mm, the high-temperature resistance performance of the insulating member 400 cannot be guaranteed. The specific thickness selection is determined by those skilled in the art according to the working environment and specific dimensions of the top cover assembly, which will not be elaborated here.

[0034] As an alternative embodiment, the insulating layer 410 is made of any one of polyphenylene sulfide (PPS) parts, liquid crystal polymer (LCP) parts, polyether ether ketone (PEEK) parts, and soluble polytetrafluoroethylene (PFA) parts. In this embodiment, the manufacturing material of the insulating layer 410 is not specifically limited, as long as it has good insulation performance and can withstand high-temperature environments. Specifically, it is a plastic part with the advantage of low cost. The heat-resistant layer 420 is made of any one of ceramic parts, mica parts, and silicone rubber parts. The heat-resistant layer 420 has better heat resistance, that is, it can withstand higher temperatures, but its manufacturing cost is relatively high. In this embodiment, the heat-resistant layer 420 is made of a ceramic part, which will not be elaborated here.

[0035] Furthermore, the top wall of the first part 310 is higher than the top wall of the heat-resistant layer 420, and the top wall of the first part 310 is not higher than the top wall of the insulating layer 410. Thus, the first part 310 of the insulating sealing ring 300 will not be made too high, ensuring the good mechanical strength of the insulating sealing ring 300. At the same time, the insulating sealing ring 300 can completely cover the heat-resistant layer 420, ensuring that the heat-resistant layer 420 can withstand a certain temperature while protecting the internal insulating sealing ring 300 from the influence of high temperature.

[0036] Please continue to refer to Figure 3, the bottom of the above-mentioned terminal post 200 includes an abutting portion 220 that extends radially beyond the above-mentioned mounting hole 110, and the second part 320 is clamped between the abutting portion 220 and the above-mentioned top cover body 100. The terminal post 200 is fixed to the mounting hole 110 of the above-mentioned top cover body 100 by riveting, thereby forming a connecting portion 210 and an abutting portion 220 at the top and bottom of the terminal post 200. Through the arrangement of the insulating member 400, the first part 310 and the second part 320, the terminal post 200 realizes a sealed and insulated connection with the mounting hole 110 and the top cover body 100, and its insulating effect is better.

[0037] In this embodiment, a single cell is also provided. The single cell includes the top cover assembly described in any of the above solutions. The single cell is specifically a cylindrical cell, and its top cover body 100 is actually integrally formed with the lower housing 120, and the lower housing 120 is provided with a through hole for the battery core to be placed. The single cell has the beneficial effects of the top cover assembly described in any of the above solutions, which will not be elaborated here. Specifically, the heat-resistant layer of the single cell can still maintain good insulation performance in a new high-temperature environment, avoiding the contact between the terminal post 200 and the top cover body 100 due to the damage of the insulating layer 410, ensuring the reliability of the insulation between the terminal post 200 and the top cover body 100, and without the need to make the entire insulating member 400 from the temperature-resistant layer 420, the high-temperature resistance performance of the single cell is realized at low cost, and its insulation performance is improved, improving the use safety and reliability of the single cell.

[0038] In this embodiment, an electrical device is also provided. The electrical device includes the single cell described in the above solution. The electrical device can specifically be an electric bicycle, an electric vehicle, a hybrid vehicle, a ship, an energy storage device, etc., as long as it uses electrical energy as the energy source, which will not be elaborated here.

[0039] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not intended to limit 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 the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Top cover assembly, characterized in that Comprising: A top cover body (100), wherein the top cover body (100) is provided with an installation hole (110); A pole terminal (200), the pole terminal (200) is inserted into the installation hole (110), and the top of the pole terminal (200) includes a connection portion (210) that extends radially beyond the installation hole (110); An insulating sealing ring (300), the insulating sealing ring (300) is clamped between the pole terminal (200) and the inner wall of the installation hole (110); An insulating member (400), the insulating member (400) is clamped between the bottom wall of the connection portion (210) and the top wall of the top cover body (100); the insulating member (400) includes at least 1 insulating layer (410) and at least 1 heat-resistant layer (420) stacked along the height direction, and the heat resistance of the heat-resistant layer (420) is higher than that of the insulating layer (410).

2. The top cover assembly according to claim 1, characterized in that The insulating sealing ring (300) includes a first part (310) and a second part (320) that are perpendicular to each other. The first part (310) is clamped between the pole terminal (200) and the circumferential inner wall of the installation hole (110), and the second part (320) abuts against the bottom wall of the top cover body (100).

3. The top cover assembly according to claim 2, characterized in that The top wall of the first part (310) extends beyond the top wall of the top cover body (100), so that at least part of the insulating member (400) abuts against the outer circumferential wall of the first part (310).

4. The top cover assembly according to claim 3, wherein The insulating member (400) includes 1 insulating layer (410) and 1 heat-resistant layer (420) stacked up and down, and the thickness of the heat-resistant layer (420) is not less than 0.3 mm.

5. The top cover assembly according to claim 4, wherein, The top wall of the first part (310) is higher than the top wall of the heat-resistant layer (420), and the top wall of the first part (310) is not higher than the top wall of the insulating layer (410).

6. The top cover assembly according to claim 2, characterized in that The bottom of the pole terminal (200) includes an abutting portion (220) that extends radially beyond the installation hole (110), and the second part (320) is clamped between the abutting portion (220) and the top cover body (100).

7. The top cover assembly according to any one of claims 1-6, characterized in that, The insulating layer (410) is made of any one of polyphenylene sulfide parts, liquid crystal polymer parts, polyether ether ketone parts, and soluble polytetrafluoroethylene parts.

8. The top cover assembly according to any one of claims 1-6, characterized in that, The heat-resistant layer (420) is made of any one of ceramic parts, mica parts, and silicone rubber parts.

9. A single cell, characterized in that, Including the top cover assembly according to any one of claims 1-8.

10. Electrical equipment, characterized in that, Including the single cell according to claim 9.

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