Secondary battery top cover and top cover sheet thereof, battery and electric device

Abstract

The utility model relates to a secondary battery top cover, a top cover sheet thereof, a battery and an electric device. The top cover piece of the secondary battery top cover comprises a top cover piece body and a boss, the top cover piece body is provided with a pole mounting hole and a sealing connecting part located on the periphery of the pole mounting hole, the pole mounting hole is used for allowing a pole of the secondary battery top cover to penetrate through, and the sealing connecting part sequentially comprises a first side and a second side in the penetrating direction of the pole; and the boss is integrally formed on the second side of the sealing connecting part and is used for increasing the connecting area of the sealing connecting part and the injection molding part of the secondary battery top cover. The top cover plate can reduce the deformation of the part, pressed on the sealing element, of the top cover plate when the internal pressure of the secondary battery rises, so that the aims of preventing the pole position of the top cover of the secondary battery from leaking air and releasing pressure and normally opening an anti-explosion valve are fulfilled.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, in particular to a secondary battery top cover and a top cover sheet thereof, a battery and an electric device. Background Art

[0002] The top cover of a secondary battery generally includes a top cover sheet, a pole, a seal and an injection molded part. The top cover sheet has a pole mounting hole. The pole has a perforated portion and a limiting portion connected thereto. The perforated portion is penetrated through the pole mounting hole, and the limiting portion and the top cover sheet are opposite to the top cover sheet in the penetration direction. The seal is sleeved on the pole and is located between the limiting portion and the top cover sheet. When assembling the above-mentioned secondary battery top cover, the top cover sheet and the limiting portion are first squeezed against each other to compress the seal so that the seal has a compression amount, and then injection molding is performed between the inner wall of the pole mounting hole and the pole to form an injection molded part, the injection molded part connects the side of the top cover sheet away from the limiting portion and the perforated portion, and seals the gap between the inner wall of the pole mounting hole and the pole and the compression amount of the fixed seal, so that the pole position has a good sealing effect.

[0003] However, it is found in actual applications that when a secondary battery has thermal runaway or self-gassing, the internal pressure of the secondary battery rises, and the part of the top cover sheet pressed on the seal will bulge upward under this pressure, that is, it will bulge in the direction away from the limiting portion, causing the compression amount of the seal to decrease sharply and fail, that is, causing the seal to rebound and lose its sealing effect, leaking gas and releasing pressure from the pole position, causing the explosion-proof valve to fail to open normally (causing the explosion-proof valve to fail to open normally), and further leading to a safety accident. Utility Model Content

[0004] Based on this, it is necessary to provide a top cover sheet for a secondary battery top cover, which can reduce the deformation of the part of the top cover sheet pressing on the seal when the internal pressure of the secondary battery rises, thereby preventing air leakage and pressure release at the pole position of the secondary battery top cover and opening the explosion-proof valve normally.

[0005] The utility model provides a top cover sheet of a secondary battery top cover, comprising:

[0006] A top cover sheet body, having a pole mounting hole and a sealing connection portion located at the periphery of the pole mounting hole, wherein the pole mounting hole is used for the pole of the secondary battery top cover to pass through, and in the passing direction of the pole, the sealing connection portion sequentially includes a first side and a second side; and

[0007] A boss is integrally formed on the second side of the sealing connection portion and is used to increase a connection area between the sealing connection portion and the injection molded part of the secondary battery top cover.

[0008] In one embodiment, the boss is annular.

[0009] In one embodiment, a side of the boss away from the sealing connection portion has a chamfer.

[0010] In one embodiment, the boss is a straight boss or a locking boss.

[0011] In one embodiment, the boss is a locking boss, which has a vertical portion and a horizontal portion, the vertical portion extends from the second side in a direction away from the second side, and the vertical portion is flush with the inner wall of the pole mounting hole, the horizontal portion is parallel to the second side and spaced apart, and one end of the horizontal portion close to the pole mounting hole is connected to the end of the vertical portion away from the second side.

[0012] In one embodiment, the top cover sheet body further comprises a main body connected to the sealing connection portion, the thickness of the sealing connection portion is smaller than that of the main body, and a receiving groove for receiving the sealing member of the secondary battery top cover is formed on the first side.

[0013] The utility model also provides a secondary battery top cover, comprising:

[0014] A top cover sheet of the secondary battery top cover;

[0015] A pole having a connected perforated portion and a limiting portion, wherein the perforated portion is arranged on the pole mounting hole, and the limiting portion is opposite to the sealing connection portion in a perforated direction;

[0016] a sealing member, sleeved on the pole and compressed between the limiting portion and the first side; and

[0017] The injection molded part wraps the boss and connects the perforated portion, and also seals the gap between the inner wall of the pole mounting hole and the pole.

[0018] In one embodiment, it also includes a lower insulating member, which has a through hole corresponding to the pole mounting hole and a connecting platform located at the periphery of the through hole, the perforated portion is penetrated through the through hole, the connecting platform is placed on the limiting portion, the sealing member is located between the inner wall of the through hole and the perforated portion, and the connecting platform is clamped between the top cover sheet and the limiting portion.

[0019] In one embodiment, the top cover sheet body has two pole mounting holes and an explosion-proof valve mounting hole located between the two pole mounting holes, there are two poles, and the two poles are respectively mounted in the two pole mounting holes, and the secondary battery top cover also includes an explosion-proof valve, and the explosion-proof valve is mounted in the explosion-proof valve mounting hole; and / or

[0020] The injection molded part is connected to the sealing part; and / or

[0021] The inner wall of the through hole abuts against the sealing member.

[0022] The utility model also provides a battery, comprising:

[0023] case;

[0024] A battery cell is disposed in the housing; and

[0025] The secondary battery top cover is arranged at the end of the shell.

[0026] The utility model also provides an electric device, comprising the battery.

[0027] When the secondary battery top cover including the above-mentioned top cover sheet is applied to the secondary battery, the additional boss integrally formed on the second side of the sealing connection part can increase the connection area between the sealing connection part and the injection molded part of the secondary battery top cover, that is, the connection area between the top cover sheet and the injection molded part of the secondary battery top cover can be increased, so that the combination of the top cover sheet and the injection molded part of the secondary battery top cover is more firmly ensured, and when the top cover sheet is bulged by internal pressure, the bulge degree of the sealing connection part of the top cover sheet used to ensure the sealing connection is reduced, that is, the deformation of the sealing connection part of the top cover sheet used to ensure the sealing connection is reduced, so as to avoid the situation that the compression amount of the seal is sharply reduced and fails, and air leakage and pressure release occur from the pole position, thereby effectively ensuring that the pole position has good air tightness, and avoiding the situation that the explosion-proof valve cannot open normally (the explosion-proof valve cannot be opened normally), which leads to the occurrence of safety accidents. In addition, on the above-mentioned top cover sheet, an additional boss is integrally formed on the second side of the sealing connection portion, so that the components of the secondary battery top cover can be reduced. The reduction in components can solve the problem of complicated assembly process of the secondary battery top cover and the problem of more internal space of the secondary battery top cover being occupied due to many components. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A top view of a secondary battery top cover in one embodiment of the utility model;

[0030] Figure 2 For along Figure 1 The cross-section diagram of line AA in ;

[0031] Figure 3 for Figure 2 A local enlarged view of point B in FIG.

[0032] Figure 4 for Figure 1 A partial exploded view of a secondary battery top cover;

[0033] Figure 5 for Figure 1 The secondary battery top cover in FIG. is a schematic diagram of the structure of the top cover sheet;

[0034] Figure 6 A top view of a secondary battery cover in another embodiment of the utility model;

[0035] Figure 7 For along Figure 6 The cross-sectional view of the CC line in ;

[0036] Figure 8 for Figure 7 A local enlarged view of D in FIG.

[0037] Fig. 9 for Figure 6 A partial exploded view of a secondary battery top cover;

[0038] Fig.10 for Figure 6 The secondary battery top cover in FIG. 1 is a schematic diagram of the structure of the top cover sheet. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0045] like Figure 1-Figure 5 As shown, a secondary battery top cover 10 in a preferred embodiment of the utility model comprises a top cover sheet 200 , a pole 300 , a sealing member 400 and an injection molded member 500 .

[0046] Among them, the top cover sheet 200 includes a top cover sheet body 210 and a boss 220. The top cover sheet body 210 has a pole mounting hole 212 and a sealing connection portion 214. The sealing connection portion 214 is located at the periphery of the pole mounting hole 212. The pole mounting hole 212 is used for the pole 300 of the secondary battery top cover 10 to pass through. In the direction of passing through the pole 300, the sealing connection portion 214 includes a first side 214a and a second side 214b in sequence. The boss 220 is integrally formed on the second side 214b of the sealing connection portion 214. The boss 220 is used to increase the connection area between the sealing connection portion 214 and the injection molded part 500 of the secondary battery top cover 10.

[0047] In the related art, when a secondary battery experiences thermal runaway or self-gassing, the internal pressure of the secondary battery rises, and the portion of the top cover sheet pressed on the seal 400 will bulge upward under this pressure, that is, it will bulge in the direction of the limiting portion 320 away from the pole 300, causing the compression amount of the seal 400 to decrease sharply and fail, that is, causing the seal 400 to rebound and lose its sealing effect, leaking gas and releasing pressure from the pole 300, causing the explosion-proof valve to fail to open normally (causing the explosion-proof valve to fail to open normally), and further causing a safety accident.

[0048] When the secondary battery top cover 10 including the top cover sheet 200 is applied to the secondary battery, the boss 220 integrally formed on the second side 214b of the sealing connection portion 214 can increase the connection area between the sealing connection portion 214 and the injection molded part 500 of the secondary battery top cover 10, that is, the connection area between the top cover sheet 200 and the injection molded part 500 of the secondary battery top cover 10 can be increased, so that the connection between the top cover sheet 200 and the injection molded part 500 of the secondary battery top cover 10 is more firmly secured, thereby ensuring that the top cover sheet 200 is protected from the internal When the pressure rises, the protrusion degree of the sealing connection part 214 of the top cover piece 200 used to ensure the sealed connection is reduced, that is, the deformation of the sealing connection part 214 of the top cover piece 200 used to ensure the sealed connection is reduced, so as to avoid the compression amount of the seal 400 being reduced sharply and failing, and air leakage and pressure release from the pole 300 position, thereby effectively ensuring that the pole 300 position has good air tightness, avoiding the explosion-proof valve from failing to open normally (the explosion-proof valve cannot be opened normally), which in turn leads to the occurrence of a safety accident.

[0049] In addition, on the above-mentioned top cover sheet 200, the additional boss 220 is integrally formed on the second side 214b of the sealing connection portion 214. In this way, the components of the secondary battery top cover 10 can be reduced. The reduction of components can solve the problem of complicated assembly process of the secondary battery top cover 10, and can also solve the problem of more internal space of the secondary battery top cover 10 being occupied due to many components.

[0050] In this embodiment, the boss 220 is annular. That is, in this embodiment, the boss 220 surrounds the pole mounting hole 212 for one circle, which is more conducive to increasing the connection area between the sealing connection part 214 and the injection molded part 500 of the secondary battery top cover 10 than providing a plurality of bosses 220 arranged at intervals along the circumference of the pole mounting hole 212, thereby further reducing the deformation of the sealing connection part 214 of the top cover sheet 200 for ensuring the sealing connection, and further more effectively ensuring that the pole 300 position has good airtightness.

[0051] In the present embodiment, the side of the boss 220 away from the sealing connection portion 214 has a chamfer 220a. In this way, it is more conducive to increasing the connection area between the sealing connection portion 214 and the injection molded part 500 of the secondary battery top cover 10, thereby reducing the deformation of the sealing connection portion 214 of the top cover sheet 200 used to ensure the sealed connection, and thus more effectively ensuring that the position of the pole 300 has good airtightness. Specifically, in the present embodiment, there are two chamfers 220a, one chamfer 220a is located at the edge of the boss 220 close to the pole mounting hole 212, and the other chamfer 220a is located at the edge of the boss 220 away from the pole mounting hole 212. It can be understood that in other embodiments, there can also be one chamfer 220a.

[0052] In this embodiment, the boss 220 is a straight boss. That is, in this embodiment, the boss 220 extends continuously from the second side 214b of the sealing connection part 214 to the direction away from the second side 214b, without a hollow area or a disconnected area. In this way, the boss 220 can not only increase the connection area between the sealing connection part 214 and the injection molded part 500 of the secondary battery top cover 10, but also increase the thickness of the sealing connection part 214, thereby increasing the strength of the sealing connection part 214.

[0053] In some embodiments, Figure 6-Figure 10 As shown, the boss 220 is a locking boss. In this way, the boss 220 can be buckled with the injection molded part 500 of the secondary battery top cover 10. When the top cover sheet 200 bulges upward due to internal pressure, the buckled boss 220 and the injection molded part 500 of the secondary battery top cover 10 can lock the sealing connection part 214 of the top cover sheet 200, further reducing the deformation of the sealing connection part 214, and more effectively ensuring that the position of the pole 300 has good airtightness.

[0054] In the present embodiment, the snap-locking boss has a vertical portion 222 and a horizontal portion 224. The vertical portion 222 extends continuously from the second side 214b of the sealing connection portion 214 in a direction away from the second side 214b, and the vertical portion 222 is flush with the inner wall of the pole mounting hole 212. The horizontal portion 224 is parallel and spaced apart from the second side 214b of the sealing connection portion 214, and one end of the horizontal portion 224 close to the pole mounting hole 212 is connected to one end of the vertical portion 222 away from the second side 214b of the sealing connection portion 214. In this way, it is more conducive to making the snap-locking boss. It can be understood that in other embodiments, the snap-locking boss may also have a vertical portion 222 and a hook portion obliquely connected relative to the vertical portion 222.

[0055] In this embodiment, the top cover sheet body 210 also has a main body 216. The main body 216 is connected to the sealing connection part 214. The thickness of the sealing connection part 214 is less than the thickness of the main body 216, and a receiving groove 210a for receiving the sealing member 400 of the secondary battery top cover 10 is formed on the first side 214a. In this way, it is more convenient to assemble the above-mentioned secondary battery top cover 10. It can be understood that in other embodiments, the thickness of the sealing connection part 214 can also be the same as the thickness of the main body 216, in which case the receiving groove 210a can be omitted.

[0056] In this embodiment, the pole 300 has a connected perforated portion 310 and a limiting portion 320. The perforated portion 310 is penetrated on the pole mounting hole 212. The limiting portion 320 is opposite to the sealing connection portion 214 in the penetration direction. The seal 400 is sleeved on the pole 300 and compressed between the limiting portion 320 and the first side 214a. The injection molded part 500 wraps the boss 220 and connects the perforated portion 310. The injection molded part 500 also seals the gap between the inner wall of the pole mounting hole 212 and the pole 300. In this way, it is more conducive to assembling the above-mentioned secondary battery top cover 10, and can more effectively ensure that the position of the pole 300 has good airtightness.

[0057] In this embodiment, the injection molded part 500 is connected to the sealing part 400. In this way, it can more effectively ensure that the position of the pole 300 has good airtightness.

[0058] In the present embodiment, the top cover sheet body 210 has two pole mounting holes 212 and an explosion-proof valve mounting hole 218 located between the two pole mounting holes 212. Accordingly, in the present embodiment, there are two poles 300, and the two poles 300 are respectively mounted in the two pole mounting holes 212. The secondary battery top cover 10 also includes an explosion-proof valve 600, which is mounted in the explosion-proof valve mounting hole 218. It is understood that in other embodiments, the explosion-proof valve mounting hole 218 may also be located at the end of the straight line defined by the two pole mounting holes 212. It is understood that in other embodiments, the top cover sheet body 210 may also have only one pole mounting hole 212.

[0059] In the present embodiment, the secondary battery top cover 10 further includes a lower insulating member 700. The lower insulating member 700 has a through hole 710 and a connecting platform 720. The through hole 710 is correspondingly connected to the pole mounting hole 212. The connecting platform 720 is located at the periphery of the through hole 710. The perforated portion 310 is penetrated through the through hole 710. The connecting platform 720 is placed on the limiting portion 320. The sealing member 400 is located between the inner wall of the through hole 710 and the perforated portion 310. The connecting platform 720 is clamped between the top cover sheet 200 and the limiting portion 320. In this way, it is more conducive to assembling the above-mentioned secondary battery top cover 10, and it can more effectively ensure that the pole 300 position has good air tightness.

[0060] In this embodiment, the inner wall of the through hole 710 abuts against the sealing member 400. In this way, it can more effectively ensure that the position of the pole 300 has good airtightness.

[0061] The utility model also provides a battery. The battery comprises a shell, a battery core and the above-mentioned secondary battery top cover 10. The battery core is arranged in the shell. The secondary battery top cover 10 is arranged at the end of the shell.

[0062] This embodiment also provides an electric device, which includes the battery, and the battery can provide electric energy for the electric device.

[0063] Among them, the above-mentioned electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, energy storage equipment, amusement equipment, elevators and lifting equipment, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys or electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.; energy storage equipment can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, jumping machines, etc. This application does not impose special restrictions on the above-mentioned electrical devices.

[0064] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A top cover sheet for a secondary battery top cover, characterized in that: include: A top cover sheet body, having a pole mounting hole and a sealing connection portion located at the periphery of the pole mounting hole, wherein the pole mounting hole is used for the pole of the secondary battery top cover to pass through, and in the passing direction of the pole, the sealing connection portion sequentially includes a first side and a second side; and A boss is integrally formed on the second side of the sealing connection portion and is used to increase a connection area between the sealing connection portion and the injection molded part of the secondary battery top cover.

2. The top cover sheet of the secondary battery top cover according to claim 1, characterized in that: The boss is annular; and / or The boss has a chamfer on one side away from the sealing connection portion.

3. The top cover sheet of the secondary battery top cover according to claim 1, characterized in that: The boss is a straight boss or a locking boss.

4. The top cover sheet of the secondary battery top cover according to claim 1, characterized in that: The boss is a locking boss, which has a vertical portion and a horizontal portion, the vertical portion extends from the second side in a direction away from the second side, and the vertical portion is flush with the inner wall of the pole mounting hole, the horizontal portion is parallel and spaced from the second side, and one end of the horizontal portion close to the pole mounting hole is connected to one end of the vertical portion away from the second side.

5. The top cover sheet of the secondary battery top cover according to claim 1, characterized in that: The top cover sheet body also has a main body connected to the sealing connection part. The thickness of the sealing connection part is smaller than that of the main body. A receiving groove for receiving the sealing member of the secondary battery top cover is formed on the first side.

6. A secondary battery top cover, characterized in that: include: A top cover sheet for a secondary battery top cover as claimed in any one of claims 1 to 5; A pole having a connected perforated portion and a limiting portion, wherein the perforated portion is arranged on the pole mounting hole, and the limiting portion is opposite to the sealing connection portion in a perforated direction; a sealing member, sleeved on the pole and compressed between the limiting portion and the first side; and The injection molded part wraps the boss and connects the perforated portion, and also seals the gap between the inner wall of the pole mounting hole and the pole.

7. The secondary battery top cover according to claim 6, characterized in that: It also includes a lower insulating member, which has a through hole corresponding to the pole mounting hole and a connecting platform located on the outer periphery of the through hole, the perforated portion is penetrated through the through hole, the connecting platform is placed on the limiting portion, the sealing member is located between the inner wall of the through hole and the perforated portion, and the connecting platform is clamped between the top cover sheet and the limiting portion.

8. The secondary battery top cover according to claim 7, characterized in that: The top cover body has two pole mounting holes and an explosion-proof valve mounting hole located between the two pole mounting holes, there are two poles, and the two poles are respectively mounted in the two pole mounting holes, and the secondary battery top cover also includes an explosion-proof valve, and the explosion-proof valve is mounted in the explosion-proof valve mounting hole; and / or The injection molded part is connected to the sealing part; and / or The inner wall of the through hole abuts against the sealing member.

9. A battery, characterized in that: include: case; A battery cell, disposed in the housing; as well as The secondary battery top cover according to any one of claims 6 to 8 is arranged at the end of the shell.

10. An electrical device, characterized in that: Comprising the battery as claimed in claim 9.

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