Battery cover plate, battery and electric device

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cover plate, a battery and an electric device. The battery cover plate comprises a cover plate body, a pole terminal, an insulating sealing ring and an insulating part, wherein a mounting hole is formed in the cover plate body; 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 cover plate body; the insulating part comprises a supporting core body and a temperature-resistant layer wrapping the outer wall of the supporting core body, the heat resistance of the temperature-resistant layer is higher than that of the insulating sealing ring, and the mechanical strength of the supporting core body is higher than that of the temperature-resistant layer. According to the battery cover plate, the insulating property between the pole terminal and the cover plate body can be ensured, the whole insulating sealing ring or insulating part does not need to be made of a temperature-resistant layer, the high-temperature resistance of the battery is realized at low cost, the insulating property of the battery is improved, and the use safety and reliability of the battery are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cover plate, a battery and an electrical device. 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 terminal assembly of the battery. The terminal 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 terminal assembly and the battery housing are often insulated and connected through an upper plastic part to avoid unsafe phenomena such as short circuit of the cylindrical battery.

[0003] Since cylindrical batteries are developing towards high energy density and high charge-discharge power, the current intensity of the terminal assembly is large in a short time and the usage frequency is high. Therefore, the heat generated by the terminal assembly is relatively high. Therefore, while ensuring good insulation between the terminal assembly and the battery housing, it is also required that the battery cover plate, the terminal 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 upper plastic part will drop significantly above 300°C. Even above a certain temperature, the upper plastic part will melt, 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 a skeleton to support the upper plastic part and improve the mechanical strength of 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 battery cover plate, battery and electrical device 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 battery cover plate, which can achieve the high-temperature resistance performance of the battery cover plate at low cost, and its insulation performance is improved, thereby improving the use safety and reliability of the battery cover plate.

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

[0007] The battery cover plate includes a cover plate body, a pole terminal, an insulating sealing ring and an insulating member. The cover plate body is provided with a mounting hole. The pole terminal is inserted into the mounting hole. The top of the pole terminal includes a connecting portion that extends radially beyond the mounting hole. The insulating sealing ring is clamped between the pole terminal and the mounting hole. The insulating member is clamped between the bottom wall of the connecting portion and the top wall of the cover plate body. The insulating member includes a support core and a temperature-resistant layer covering the outer wall of the support core. The heat resistance of the temperature-resistant layer is higher than that of the insulating sealing ring, and the mechanical strength of the support core is higher than that of the temperature-resistant layer.

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

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

[0010] Optionally, an avoidance groove is provided on the bottom wall of the connecting portion, and the insulating member is accommodated in the avoidance groove.

[0011] Optionally, the avoidance groove communicates with the outer circumferential wall of the connecting portion, and the outer diameter of the insulating member is not less than the outer diameter of the connecting portion.

[0012] Optionally, the bottom of the pole terminal includes an abutting portion that extends radially beyond the mounting hole, and the second portion is clamped between the abutting portion and the cover plate body.

[0013] Optionally, the support core and the insulating sealing ring are 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 invention is to provide a battery, which includes the battery cover plate described in any of the above solutions.

[0016] Still another object of the present invention is to provide an electrical device, which includes the battery described in the above solution.

[0017] Beneficial effects:

[0018] In the top cover assembly of the present utility model, mounting holes are provided on the cover body, and the pole terminal is inserted into the mounting holes. At the same time, an insulating sealing ring is clamped between the pole terminal and the mounting holes to achieve the sealed insulation connection between the pole terminal and the cover body. Meanwhile, an insulating member is clamped between the connecting portion at the top of the pole terminal and the top wall of the cover body. The insulating member is made by wrapping a heat-resistant layer around the outer wall of the support core. When the battery cover is placed in a high-temperature environment, since the heat resistance of the heat-resistant layer is higher than that of the insulating sealing ring, even if the insulating sealing ring is damaged or fails at high temperature, the insulating member can still maintain good insulation performance in the high-temperature environment. At the same time, the support core supports the heat-resistant layer, improving its overall strength and preventing the pole terminal from contacting the cover body due to the damage of the insulating sealing ring or the support core, ensuring the reliability of the insulation between the pole terminal and the cover body. And it is not necessary to make the entire insulating sealing ring or insulating member from the heat-resistant layer, achieving the high-temperature resistance performance of the battery at low cost, and improving its insulation performance, thus enhancing the safety and reliability of the battery during use. Description of the Drawings

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

[0020] Figure 2 is a longitudinal sectional view of the battery 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, cover body; 110, mounting hole; 120, lower housing; 200, pole terminal; 210, connecting portion; 211, avoidance groove; 220, abutting portion; 300, insulating sealing ring; 310, first part; 320, second part; 400, insulating member; 410, support core; 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 an integral body; 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 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 utility model can be understood according to specific situations.

[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 therebetween. 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", "under", and "beneath" 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, so it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0028] Please refer to Figure 1 and Figure 2 , the battery cover plate in this embodiment is used for cylindrical batteries, and its cover plate 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. Of course, this battery cover plate can also be applied to square batteries, and only the specific structure of the battery cover plate described in this embodiment needs to be adopted. The battery cover plate is directly installed on the bottom case of the square battery, which will not be elaborated here. Next, the specific structure of the battery cover plate in this embodiment will be described in detail with reference to Figure 2 and Figure 3 .

[0029] The battery cover plate includes a cover plate body 100, a pole terminal 200, an insulating sealing ring 300, and an insulating member 400. The cover plate 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 member 400 is clamped between the bottom wall of the connecting portion 210 and the top wall of the cover plate body 100; the insulating member 400 includes a support core 410 and a heat-resistant layer 420 covering the outer wall of the support core 410. The heat resistance of the heat-resistant layer 420 is higher than that of the insulating sealing ring 300, and the mechanical strength of the support core 410 is higher than that of the heat-resistant layer 420.

[0030] In the top cover assembly of this embodiment, by providing a mounting hole 110 in the cover plate 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 cover plate body 100 is achieved; at the same time, an insulating member 400 is clamped between the connecting portion 210 at the top of the pole terminal 200 and the top wall of the cover plate body 100. The insulating member 400 is made by wrapping the support core 410 with the heat-resistant layer 420. When the battery cover plate is placed in a high-temperature environment, since the heat resistance of the heat-resistant layer 420 is higher than that of the insulating sealing ring, even if the insulating sealing ring 300 is damaged or fails at high temperature, the insulating member 400 can still maintain good insulating performance in the high-temperature environment. At the same time, the support core 410 supports the heat-resistant layer 420, improving its overall strength, preventing the pole terminal 200 from contacting the cover plate body 100 due to the damage of the insulating sealing ring 300 or the support core 410, ensuring the reliability of the insulation between the pole terminal 200 and the cover plate body 100, and without making the entire insulating sealing ring 300 or the insulating member 400 made of the heat-resistant layer 420, the high-temperature resistance performance of the battery is realized at low cost, and its insulating performance is improved, improving the use safety and reliability of the battery.

[0031] Optionally, the insulating sealing ring 300 includes a first portion 310 and a second portion 320 that are perpendicular to each other. The first portion 310 is clamped between the pole terminal 200 and the circumferential inner wall of the mounting hole 110, and the second portion 320 abuts against the bottom wall of the cover plate body 100. Thus, the longitudinal section of the insulating sealing ring 300 is L-shaped, realizing multi-channel sealing between the insulating sealing ring 300 and the mounting hole 110 and the cover plate body 100, and improving the insulating and sealing effects.

[0032] Further, the top wall of the first part 310 extends beyond the top wall of the cover plate 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 cover plate 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 cover plate 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] As Figure 3 shown, an avoidance groove 211 is formed in the bottom wall of the connecting part 210, and the insulating member 400 is accommodated in the avoidance groove 211. The formation of the avoidance groove 211 can not only position and limit the installation position of the insulating member 400, prevent the insulating member 400 from loosening, improve the installation stability, and further improve the insulation effect, but also reduce the size of the cover plate assembly in the height direction, thereby reducing the space occupied by the cover plate assembly and improving the energy density of the battery using the cover plate assembly.

[0034] Further, the top wall of the first part 310 is not higher than the top wall of the insulating member 400. 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 member 400 can completely cover the part where the first part 310 extends beyond the top wall of the cover plate body 100, ensuring that the temperature-resistant layer 420 can withstand a certain temperature while protecting the internal insulating sealing ring 300 from the influence of high temperature.

[0035] As a preferred embodiment, the avoidance groove 211 communicates with the circumferential outer wall of the connecting part 210, and the outer diameter of the insulating member 400 is not less than the outer diameter of the connecting part 210. When installing the insulating member 400, it is only necessary to align the circumferential inner wall of the insulating member 400 with one side wall of the avoidance groove 211, improving the positioning efficiency, facilitating the assembly of the insulating member 400, and further improving the production efficiency. At the same time, the outer diameter of the insulating member 400 is not less than the outer diameter of the connecting part 210, so that the circumferential outer wall of the insulating member 400 extends beyond the connecting part 210, and then the contact area between the insulating member 400 and the top wall of the cover plate body 100 is larger, improving the sealing performance and insulation performance between the insulating member 400 and the cover plate body 100, and improving the reliability of use.

[0036] In this embodiment, the inner diameter of the groove side wall at the position close to the axis of the avoidance groove 211 is exactly the same as the inner diameter of the first part 310 and the inner diameter of the mounting hole 110, so as to realize the multi-section sealed insulation connection of the insulating member 400, the insulating sealing ring 300 and the mounting hole 110, with higher insulation performance and more convenient installation of the insulating member 400.

[0037] Specifically, the thickness of the above-mentioned temperature-resistant layer 420 wrapping the support core 410 is not less than 0.3 mm. If the thickness of the temperature-resistant layer 420 is less than 0.3 mm, the high-temperature resistance performance of the insulating part 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 battery cover plate, which will not be elaborated here.

[0038] Please continue to refer to Figure 3 , the bottom of the above-mentioned pole terminal 200 includes a contact portion 220 extending radially beyond the above-mentioned mounting hole 110, and the second portion 320 is clamped between the contact portion 220 and the above-mentioned cover plate body 100. The pole terminal 200 is fixed in the mounting hole 110 of the above-mentioned cover plate body 100 by riveting, thereby forming the connecting portion 210 and the contact portion 220 at the top and bottom of the pole terminal 200. Through the arrangement of the first portion 310, the second portion 320 and the insulating part 400, the pole terminal 200 realizes a sealed and insulated connection with the mounting hole 110 and the cover plate body 100, and its insulating effect is better.

[0039] Optionally, the above-mentioned insulating sealing ring 300 and the above-mentioned support core 410 are 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 materials of the insulating sealing ring 300 and the support core 410 are not specifically limited, as long as they have good insulating performance, can withstand high-temperature environments and have certain mechanical strength. Specifically, they are selected as plastic parts, which have the advantage of low cost.

[0040] Furthermore, the above-mentioned temperature-resistant layer 420 is made of any one of ceramic parts, mica parts and silicone rubber parts. The temperature-resistant layer 420 has better heat resistance than the support core 410 made of plastic parts, that is, it can withstand higher temperatures, but its manufacturing cost is higher. In this embodiment, the temperature-resistant layer 420 is made by wrapping ceramic or silicone rubber on the surface of the support core 410 using a molding process, which will not be elaborated here.

[0041] In this embodiment, a battery is further provided. The battery includes a battery cover plate as described in any of the above solutions. The battery is specifically a cylindrical battery, and its cover plate body 100 is actually integrally formed with the lower housing 120. The lower housing 120 is provided with a through hole for placing the battery core. The battery has the beneficial effects of the battery cover plate described in any of the above solutions, which will not be elaborated here. Specifically, the insulating member 400 of the battery can still maintain good insulating performance in a high-temperature environment, preventing the pole terminal 200 from contacting the cover plate body 100 due to the damage of the insulating sealing ring 300 or the support core body 410, ensuring the reliability of insulation between the pole terminal 200 and the cover plate body 100. Moreover, it is not necessary to make the entire insulating sealing ring 300 or the insulating member 400 from the temperature-resistant layer 420, achieving the high-temperature resistance performance of the battery at low cost, improving its insulating performance, and enhancing the safety and reliability of the battery during use.

[0042] In this embodiment, an electrical device is further provided. The electrical device includes the battery described in the above solution. The electrical device can specifically be a battery module, a battery pack, an electric bicycle, an electric vehicle, a hybrid vehicle, a ship, an energy storage device, etc., as long as it uses the power of the battery as the energy source, which will not be elaborated here.

[0043] 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 the 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 cover plate, characterized in that, Comprising: A cover plate body (100), the cover plate body (100) being provided with a mounting hole (110); A pole terminal (200), the pole terminal (200) being inserted into the mounting hole (110), the top of the pole terminal (200) including a connecting portion (210) that extends radially beyond the mounting hole (110); An insulating sealing ring (300), the insulating sealing ring (300) being clamped between the pole terminal (200) and the inner circumferential wall of the mounting hole (110); An insulating member (400), the insulating member (400) being clamped between the bottom wall of the connecting portion (210) and the top wall of the cover plate body (100); the insulating member (400) includes a support core (410) and a heat-resistant layer (420) covering the outer wall of the support core (410), the heat resistance of the heat-resistant layer (420) being higher than that of the insulating sealing ring (300), and the mechanical strength of the support core (410) being higher than that of the heat-resistant layer (420).

2. The battery cover plate according to claim 1, characterized in that The insulating sealing ring (300) includes a first portion (310) and a second portion (320) that are perpendicular to each other, the first portion (310) being clamped between the pole terminal (200) and the inner circumferential wall of the mounting hole (110), and the second portion (320) abutting against the bottom wall of the cover plate body (100).

3. The battery cover plate according to claim 2, wherein, The top wall of the first portion (310) extends beyond the top wall of the cover plate body (100) such that at least a portion of the insulating member (400) abuts against the outer circumferential wall of the first portion (310).

4. The battery cover plate according to claim 3, characterized in that, The bottom wall of the connecting portion (210) is provided with an avoidance groove (211), and the insulating member (400) is received in the avoidance groove (211).

5. The battery cover plate according to claim 4, characterized in that, The avoidance groove (211) communicates with the outer circumferential wall of the connecting portion (210), and the outer diameter of the insulating member (400) is not less than the outer diameter of the connecting portion (210).

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

7. The battery cover plate according to any one of claims 1-6, characterized in that, The support core (410) and the insulating sealing ring (300) are made of any one of polyphenylene sulfide parts, liquid crystal polymer parts, polyether ether ketone parts, and soluble polytetrafluoroethylene parts.

8. The battery cover plate 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 battery, characterized in that, Including the battery cover plate according to any one of claims 1-8.

10. Electrical device, characterized in that, Including the battery according to claim 9.

Images