End cover patch, end cover assembly, energy storage device and electric equipment

Abstract

The utility model discloses an end cover patch, an end cover assembly, an energy storage device and electric equipment, the end cover patch is used for being attached to an end cover body and upper plastic of the end cover assembly, the end cover patch comprises a patch main body and an extension part, the patch main body is configured to be attached to the end cover body, and the extension part is configured to extend to the end cover body. The extension part is connected to the patch main body and extends upwards from the patch main body, an avoiding hole is formed in the extension part, the avoiding hole is configured to avoid the upper plastic cement, and the extension part is configured to extend along the periphery of the upper plastic cement in the thickness direction of the patch main body so as to be attached to at least part of the upper surface of the upper plastic cement. According to the technical scheme provided by the invention, the pasting quality of the paster main body and the end cover body can be prevented from being influenced by the lap joint of the paster main body and the upper plastic, and the lap joint short circuit between the pole and the end cover body caused by the fact that metal or other conductive foreign matters fall into the avoiding hole can be prevented; and the safety performance and the production yield of the battery can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to an end cover patch, an end cover assembly, an energy storage device and an electric equipment. BACKGROUND

[0002] In recent years, with the development of new energy technology, energy storage products have become increasingly important in people's daily life. As one of the electrochemical energy storage technologies, batteries have the advantages of small size, light weight, high energy density, good safety performance, long cycle life, etc., and have been widely used in various industries such as vehicles, electronic products and energy storage systems. In the production process of the battery, in order to avoid the short circuit caused by the lapping of the end cover body of the battery with the pole by the external conductive part, an end cover patch is usually attached to the end cover body of the battery to insulate the end cover body from the pole and prevent the end cover body from being scratched. The end cover patch is provided with a through hole for the pole to pass through. However, when the through hole is too small, the end cover patch is easy to lap on the upper plastic, so it is difficult to tightly fit with the end cover body, thereby affecting the production yield. When the through hole is too large, it is easy to cause the end cover body to be exposed, increasing the risk of short circuit of the battery caused by the lapping of the end cover body with the pole, and reducing the safety performance of the battery. CONTENT OF THE UTILITY MODEL

[0003] The end cover patch disclosed by the embodiments of the present application can prevent metal or other conductive foreign matter from falling into the avoidance hole to cause lapping short circuit between the pole and the end cover body, which is beneficial to improve the safety performance and production yield of the battery.

[0004] In order to achieve the above purpose, in a first aspect, the embodiments of the present application disclose an end cover patch, which is applied to an end cover assembly, the end cover assembly comprising an end cover body and an upper plastic arranged on the end cover body, the end cover patch being used for attaching to the end cover body and the upper plastic, the end cover patch comprising:

[0005] a patch body configured to attach to the end cover body; and

[0006] an extension part connected to the patch body and extending upward from the patch body, the extension part being formed with an avoidance hole configured to avoid the upper plastic, along the thickness direction of the patch body, the extension part being configured to extend along the outer periphery of the upper plastic to fit at least part of the upper surface of the upper plastic.

[0007] The end cover patch provided by the application is provided with an extension part on the patch main body, the patch main body is attached to the end cover body, and the extension part covers at least part of the upper surface of the upper plastic, so that the end cover patch can better wrap the end cover body and part of the upper plastic to isolate the end cover body from the pole. And, through the arrangement of the extension part, the problem that the patch main body directly overlaps with the upper plastic to affect the attachment quality of the patch main body and the end cover body can be avoided, so that the metal or other conductive foreign matter falling into the avoidance hole to cause the overlap short circuit between the pole and the end cover body can be prevented, and the safety performance and production yield of the battery can be improved.

[0008] As an optional implementation, the extension part comprises a first segment and a second segment, the first segment is connected to the patch main body and extends upward along the thickness direction of the patch main body, and the first segment constitutes the avoidance hole, so that the first segment is sleeved on the outer periphery of the upper plastic.

[0009] The second segment is connected to the side of the first segment away from the patch main body, and the second segment is configured to be attached to at least part of the upper surface of the upper plastic.

[0010] By extending the first segment along the outer periphery of the upper plastic and attaching the second segment to at least part of the upper surface of the upper plastic, the extension part can better wrap the connection between the upper plastic and the end cover patch, so that the conductive medium from the outside enters the connection between the upper plastic and the end cover patch from the position of the extension part and the upper plastic, thereby causing the overlap short circuit between the pole and the end cover body. The occurrence of the situation is beneficial to improve the safety performance and production yield of the battery.

[0011] As an optional implementation, a first included angle is formed between the first segment and the patch main body, and the first included angle is 85°-88°.

[0012] And / or,

[0013] A second included angle is formed between the second segment and the patch main body, and the second included angle is 2°-5°.

[0014] By setting the first included angle, on the one hand, the end cover patch can be easily demolded during production, thereby simplifying the production difficulty of the end cover patch and facilitating the improvement of the production efficiency of the end cover patch. On the other hand, when the end cover patch is attached to the end cover body and the upper plastic, the first section can guide the end cover patch, and the end of the first section close to the patch body can avoid scratching and wall-hanging with the upper plastic, thereby facilitating the assembly between the end cover patch and the end cover body and the upper plastic, simplifying the assembly difficulty of the end cover assembly, and thereby facilitating the improvement of the production efficiency of the end cover assembly. By adopting the second included angle, the end cover patch can be easily demolded during production, thereby simplifying the production difficulty of the end cover patch and facilitating the improvement of the production efficiency of the end cover patch.

[0015] As an optional implementation, the connection between the extension part and the patch body is chamfered, so that when the patch body is attached to the end cover body, there is a gap between the patch body and the outer circumferential surface of the upper plastic. By chamfering, when the end cover patch is assembled to the end cover body and the upper plastic, the patch body can avoid overlapping with the upper plastic to affect the attachment effect, and the extension part can be provided with a deformation allowance, thereby facilitating the improvement of the attachment effect of the end cover patch, and further facilitating the improvement of the safety performance and production yield of the battery.

[0016] As an optional implementation, the side of the patch body away from the extension part is provided with a glue layer, and the extension part overlaps at least part of the upper surface of the upper plastic. In this way, after the end cover patch is assembled to the end cover assembly, the patch body and the end cover body can be tightly attached by the glue layer; and the extension part overlaps at least part of the upper surface of the upper plastic, which can avoid the extension part and the upper plastic from being bonded to cause pulling during the attachment process, thereby preventing the patch body and the end cover body from being tightly attached, and further improving the attachment effect of the end cover patch.

[0017] As an optional implementation, the connection between the extension part and the patch body is not provided with the glue layer. If the glue layer is provided at the connection between the extension part and the patch body, the connection between the extension part and the patch body may be bonded with the upper plastic during the attachment process, which can affect the attachment between the patch body and the end cover body; at the same time, the existence of the glue layer can make the connection between the extension part and the patch body tightly attached to the end cover body, which can not provide enough deformation allowance for the extension part, so that when the patch body is attached to the end cover body to drive the extension part to press against the upper plastic, the extension part can be damaged by the upper plastic. Therefore, by not providing the glue layer at the connection between the extension part and the patch body, the attachment effect of the end cover patch can be improved, thereby further improving the safety performance and production yield of the battery.

[0018] As an optional implementation, the patch body is provided with an explosion-proof hole configured to avoid the explosion-proof valve of the end cover assembly, and the explosion-proof hole is spaced apart from the extension portion;

[0019] and / or,

[0020] The patch body is provided with a positive electrode mark and / or a negative electrode mark spaced apart from the extension portion.

[0021] In the above implementation, the explosion-proof hole can avoid the situation that the patch body closes the explosion-proof valve of the end cover assembly, thereby avoiding affecting the normal use of the explosion-proof valve of the end cover assembly, and facilitating the improvement of the safety performance of the battery. By providing the positive electrode mark and the negative electrode mark, the electrode polarity of the battery can be distinguished by the battery cell manufacturer, the module manufacturer or the consumer, thereby providing convenience for the production and processing process or the use process.

[0022] In a second aspect, the embodiments of the present application also disclose an end cover assembly, comprising:

[0023] an end cover body having a mounting hole penetrating through the thickness direction of the end cover body,

[0024] an upper plastic provided on the upper surface of the end cover body corresponding to the mounting hole; and

[0025] The end cover patch of the first aspect is described above, the patch body of the end cover patch is attached to the end cover body, the upper plastic is sleeved in the avoiding hole of the extension portion, and the end of the extension portion of the end cover patch away from the patch body is attached to at least part of the upper surface of the upper plastic.

[0026] The end cover assembly with the end cover patch of the first aspect can also avoid the lap joint of the patch body and the upper plastic, which affects the attachment quality of the patch body and the end cover body, and can prevent metal or other conductive foreign matters from falling into the avoiding hole to cause the lap joint short circuit between the pole and the end cover body, thereby facilitating the improvement of the safety performance and the production yield of the battery.

[0027] As an optional implementation, when the extension portion includes the first segment and the second segment, the first segment has a gap with the outer periphery of the upper plastic. In this way, the space enclosed by the first segment is larger than the size of the upper plastic, so that the end cover patch can avoid the interference between the first segment and the upper plastic, such as scratching and wall hanging, during the process of being attached to the end cover body and the upper plastic, thereby avoiding the situation that the patch body and the end cover body are not tightly attached, and facilitating the assembly of the end cover patch and improving the attachment effect of the end cover patch.

[0028] As an optional implementation, the upper plastic has an upper surface and a peripheral surface connected with the upper surface, and the first section and the second section have a gap between the connection of the first section and the second section and the connection of the upper surface and the peripheral surface. In this way, during the process of attaching the end cap patch to the end cap body and the upper plastic, interference between the first section and the upper plastic can be avoided to cause the end cap patch body and the end cap body to be not tightly attached, and the second section can be provided with a deformation allowance, thereby facilitating the attachment of the end cap patch, and further facilitating the improvement of the safety performance and production yield of the battery.

[0029] As an optional implementation, the gap between the first section and the peripheral surface of the upper plastic gradually decreases from the patch body to the second section. In this way, during the assembly of the end cap patch, the gradually decreasing gap between the first section and the peripheral surface of the upper plastic can guide the end cap patch, and facilitate the assembly of the end cap patch and the end cap body and the upper plastic, thereby facilitating the simplification of the assembly difficulty of the end cap assembly, and further facilitating the improvement of the production efficiency of the end cap assembly.

[0030] As an optional implementation, the gap at the maximum gap between the first section and the peripheral surface of the upper plastic is 0.2mm-0.5mm;

[0031] and / or,

[0032] The gap at the minimum gap between the first section and the peripheral surface of the upper plastic is 0mm-0.3mm.

[0033] By setting the gap range at the maximum gap between the first section and the peripheral surface of the upper plastic, the gap between the first section and the peripheral surface of the upper plastic can be prevented from being too large to cause the appearance of the end cap assembly to be poor, and the gap between the first section and the peripheral surface of the upper plastic can be prevented from being too small to cause interference between the first section and the peripheral surface of the upper plastic during assembly, thereby improving the assembly difficulty of the end cap patch. By setting the gap range at the minimum gap between the first section and the peripheral surface of the upper plastic, the gap between the first section and the peripheral surface of the upper plastic can be prevented from being too large to cause the appearance of the end cap assembly to be poor, and the gap can facilitate the assembly of the end cap patch, thereby facilitating the simplification of the assembly difficulty of the end cap assembly, and further facilitating the improvement of the production efficiency of the end cap assembly.

[0034] As an optional implementation, the extension part is attached to the edge of the upper surface of the upper plastic. By attaching the extension part to the edge of the upper surface of the upper plastic, on the one hand, the metal or other conductive foreign matter falling into the avoiding hole to cause the short circuit between the pole and the end cover body can be prevented, and the safety performance and production yield of the battery can be improved. On the other hand, since the positive electrode upper plastic and the negative electrode upper plastic usually have different colors, the color of the upper plastic can be exposed by attaching the extension part to the edge of the upper surface of the upper plastic, so that the electrode polarity of the battery can be distinguished by the battery manufacturer, the module manufacturer or the consumer, to provide convenience for the production process or the use process.

[0035] In a fourth aspect, the embodiments of the present application further disclose an energy storage device, including a shell and the end cover assembly as described in the second aspect above, and the end cover assembly is connected to the shell. The energy storage device with the battery as described in the third aspect above also has the end cover patch as described in the first aspect above, which can also avoid the influence of the patch body on the attachment quality of the patch body and the end cover body caused by the lapping of the patch body and the upper plastic, and can prevent the metal or other conductive foreign matter from falling into the avoiding hole to cause the short circuit between the pole and the end cover body, thereby improving the safety performance and production yield of the energy storage device.

[0036] In a fifth aspect, the embodiments of the present application further disclose a use electric device, including the energy storage device as described in the third aspect above.

[0037] Compared with the prior art, the beneficial effects of the present application are:

[0038] The end cover patch, the end cover assembly, the energy storage device and the use electric device provided by the embodiments of the present application can better wrap the end cover body and part of the upper plastic by attaching the patch body to the end cover body and covering at least part of the upper surface of the upper plastic by the extension part, so as to insulate the end cover body from the pole. Moreover, the influence of the patch body on the attachment quality of the patch body and the end cover body caused by the lapping of the patch body and the upper plastic can be avoided by the extension part, and the metal or other conductive foreign matter falling into the avoiding hole to cause the short circuit between the pole and the end cover body can be prevented, thereby improving the safety performance and production yield of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0040] Figure 1is a partial sectional view of a related art end cover patch attached to an end cover body and an upper plastic;

[0041] Figure 2 is a structure schematic diagram of an end cover patch provided by an embodiment of the present application in one view;

[0042] Figure 3 is a structure schematic diagram of an end cover patch provided by an embodiment of the present application in another view;

[0043] Figure 4 is a top view of an end cover patch provided by an embodiment of the present application;

[0044] Figure 5 is Figure 4 is a sectional view at A-A in FIG. 8;

[0045] Figure 6 is Figure 5 is a partial enlarged view at A in FIG. 9;

[0046] Figure 7 is a top view of an end cover patch (including a positive electrode mark and a negative electrode mark) provided by an embodiment of the present application;

[0047] Figure 8 is a structure schematic diagram of an end cover assembly provided by an embodiment of the present application;

[0048] Figure 9 is a top view of an end cover assembly provided by an embodiment of the present application;

[0049] Figure 10 is Figure 9 is a sectional view at B-B in FIG. 11;

[0050] Figure 11 is Figure 10 is a partial enlarged view at B in FIG. 12;

[0051] Figure 12 is a structure schematic diagram of a battery provided by an embodiment of the present application;

[0052] Figure 13 is a structure schematic diagram of an energy storage device provided by an embodiment of the present application;

[0053] Figure 14 is a structure schematic diagram of an electric equipment provided by an embodiment of the present application.

[0054] Explanation of reference signs:

[0055] 100 - end cap patch; 1 - patch body; 11 - adhesive layer; 12 - explosion-proof hole; 13 - positive electrode mark; 14 - negative electrode mark; 15 - scanning hole; 2 - extension part; 21 - first section; 21a - avoidance hole; 22 - second section; a - first included angle; b - second included angle; K - chamfer; X - thickness direction; 200 - end cap assembly; 201 - end cap body; 201a - mounting hole; 202 - upper plastic; M - upper surface of the upper plastic; N - outer peripheral surface of the upper plastic; G - gap; L - gap at the largest gap; S - gap at the smallest gap; P - upper surface of the end cap body; 300 - battery; 301 - shell; 400 - energy storage device; 500 - electrical equipment; 501 - electrical energy conversion device; 502 - user load. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0057] In the present application, the terms "upper", "lower", etc. indicate the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0058] In addition, the above-mentioned part of the terms can be used to represent other meanings in addition to the orientation or positional relationship, for example, the term "upper" may also be used to represent a certain dependent relationship or connection relationship in some cases. Those skilled in the art can understand the specific meaning of these terms in the present application according to the specific situation.

[0059] In addition, the terms "provided with", "provided with", "connected", "connected" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific situation.

[0060] In addition, the terms "first", "second", and the like are used merely to distinguish different devices, elements or components (which can be of the same or different type), and do not imply relative importance or quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "a plurality" is two or more.

[0061] Before the technical solutions of the present application are explained, the inventive concept of the present application will be explained.

[0062] In recent years, with the development of new energy technology, energy storage products have become increasingly important in people's daily life. As one of the electrochemical energy storage technologies, batteries have the advantages of small size, light weight, high energy density, good safety performance, long cycle life, etc., and have been widely used in various industries such as vehicles, electronic products and energy storage systems. Therefore, the quality and safety performance of the battery are of great concern.

[0063] In the production process of the battery, in order to avoid the situation that the end cover body of the battery is short-circuited by the external conductive part and the pole, it is usually necessary to paste the end cover patch on the end cover body of the battery to insulate the end cover body from the pole and prevent the end cover body from being scratched. In the related art, the end cover patch is provided with a through hole for the pole and the upper plastic to pass through. However, when the end cover patch is pasted on the end cover assembly, if the through hole is too small, the end cover patch is easy to be lapped on the upper plastic, so it is difficult to be closely attached to the end cover body, thereby affecting the production yield. If the through hole is too large, it is easy to cause the end cover body to be exposed, increase the risk of the end cover body being lapped with the pole to cause the battery to be short-circuited, and reduce the safety performance of the battery.

[0064] Please refer to Figure 1 , Figure 1 is a partial sectional view of the end cover patch in the related art being pasted on the end cover body and the upper plastic. In order to solve the above problem, the inventors try to set a horn-shaped protrusion 702 at the through hole 701 of the end cover patch 700, so that when the end cover patch 700 is attached to the end cover body 801, the end of the horn-shaped protrusion 702 can be sleeved on the outer peripheral surface of the upper plastic 802. However, although the horn-shaped protrusion 702 sleeved on the outer peripheral surface of the upper plastic 802 can isolate the end cover body 801 from the pole, avoid the situation that the end cover body 801 of the battery is short-circuited by the external conductive part and the pole. But when the horn-shaped protrusion 702 is too small, the horn-shaped protrusion 702 is easy to be stuck in the top end of the upper plastic 802, so that the end cover patch 700 cannot be attached to the end cover body 801. When the horn-shaped protrusion 702 is too large, there is a gap between the horn-shaped protrusion 702 and the outer peripheral surface of the upper plastic 802, causing the end cover body 801 to be exposed, and there is a risk that the end cover body 801 is lapped with the pole to cause the battery to be short-circuited.

[0065] In view of this point, the application provides an end cover patch, an end cover assembly, an energy storage device and an electric equipment. The end cover patch covers at least part of the upper surface of the upper plastic through the extension part, can better wrap the end cover body and part of the upper plastic, thereby avoiding the lap joint of the patch body and the upper plastic affecting the covering quality of the patch body and the end cover body, and preventing metal or other conductive foreign matters from falling into the avoidance hole to cause the lap joint short circuit between the pole and the end cover body, and is beneficial to improving the safety performance and production yield of the battery.

[0066] Specifically, the application discloses an end cover patch, an end cover assembly, an energy storage device and an electric equipment. The end cover patch can be applied to the end cover assembly to cover the end cover body and at least part of the upper plastic of the end cover assembly. For example, the end cover patch can be applied to the end cover assembly of a cylindrical battery or a square battery. When the battery is a cylindrical battery, the end cover body of the end cover assembly is a circular cover plate, and the end cover patch can be a circular patch to adapt to the circular cover plate. When the battery is a square battery, the end cover body of the end cover assembly is a square cover plate, and the end cover patch can be a square patch to adapt to the square cover plate. It can be seen that the end cover patch of the application can be applied to a square end cover body and a circular end cover body, which can be selected according to actual conditions, and the application does not make specific limitations.

[0067] In addition, the end cover patch can be applied to an end cover assembly with a circular upper plastic, an end cover assembly with a square upper plastic or an end cover assembly with an upper plastic of other shapes. For example, when the end cover assembly has a circular upper plastic, the avoidance hole of the end cover patch can be a circular avoidance hole to adapt to the circular upper plastic. When the end cover assembly has a square upper plastic, the avoidance hole of the end cover patch can be a square avoidance hole to adapt to the square upper plastic. It can be seen that the end cover patch of the application can be applied to an end cover assembly with a circular upper plastic, an end cover assembly with a square upper plastic or an end cover assembly with an upper plastic of other shapes, which can be selected according to actual conditions, and the application does not make specific limitations.

[0068] In order to facilitate the illustration of the specific structure of the end cover patch, the technical solutions of the application will be further described in combination with embodiments and drawings, and in order to facilitate understanding, the application will be described taking an end cover assembly with a circular upper plastic and a square end cover body as an example.

[0069] Please refer to Figures 2 to 4 , Figure 2 is a structural schematic diagram of the end cover patch from one perspective according to an embodiment of the application; Figure 3 is a structural schematic diagram of the end cover patch from another perspective according to an embodiment of the application;

[0070] Figure 4 is a top view of the end cover patch provided by the embodiments of the present application. In a first aspect, the embodiments of the present application disclose an end cover patch 100, which is applied to an end cover assembly 200 (see Figure 7 ), the end cover assembly 200 comprising an end cover body 201 and an upper plastic 202 arranged on the end cover body 201, the end cover patch 100 being used to cover the end cover body 201 and the upper plastic 202, the end cover patch 100 comprising a patch body 1 and an extension part 2, the patch body 1 being configured to cover the end cover body 201, the extension part 2 being connected to the patch body 1 and extending upward (in the thickness direction X of the patch body 1) from the patch body 1, the extension part 2 being formed with a relief hole 21a, the relief hole 21a being configured to avoid the upper plastic 202, along the thickness direction X of the patch body 1, the extension part 2 being configured to extend along the outer periphery of the upper plastic 202 to fit at least part of the upper surface of the upper plastic 202.

[0071] The end cover patch 100 provided by the embodiments of the present application covers the end cover body 201 through the patch body 1, and covers at least part of the upper surface of the upper plastic 202 through the extension part 2, so that the end cover patch 100 can better wrap the end cover body and part of the upper plastic to insulate the end cover body from the pole, and through the extension part 2, the patch body 1 can be prevented from being overlapped with the upper plastic to affect the covering quality of the patch body 1 and the end cover body, so that the metal or other conductive foreign matter can be prevented from falling into the relief hole 21a to cause the short circuit of the overlapping between the pole and the end cover body, which is beneficial to improve the safety performance and production yield of the battery.

[0072] It can be understood that the end cover patch 100 can form the above-mentioned extension part 2 through, for example, hot pressing, or injection molding, etc., so that the extension part 2 can maintain its form relative to the patch body 1, and the embodiments are not limited thereto. For example, the end cover patch 100 forms the extension part 2 through hot pressing. Through the hot pressing mode, the production difficulty of the end cover patch 100 is simplified, which is beneficial to improve the production efficiency of the end cover patch 100; and through the hot pressing mold, the end cover patch 100 has higher consistency, so as to avoid the problems such as poor covering of the end cover patch 100 and the end cover body and the upper plastic caused by the production process error, which is beneficial to improve the safety performance and production yield of the battery.

[0073] Please refer to Figure 5 and Figure 6 , Figure 5 is Figure 4 is a sectional view of A-A in Figure 6 is Figure 5The local enlarged view at A. As an optional implementation, the extending part 2 comprises a first section 21 and a second section 22, the first section 21 is connected to the patch body 1 and extends upward along the thickness direction X of the patch body 1, the first section 21 is configured with a avoiding hole 21a so as to be sleeved on the outer periphery of the upper plastic, and the second section 22 is connected to the side of the first section 21 away from the patch body 1 and is configured to be attached to at least part of the upper surface of the upper plastic. By extending the first section 21 along the outer periphery of the upper plastic and attaching the second section 22 to at least part of the upper surface of the upper plastic, the extending part 2 can better wrap the connection between the upper plastic and the end cover patch 100, thereby avoiding the situation that the conductive medium from the outside enters the connection between the upper plastic and the end cover patch 100 through the joint position between the extending part 2 and the upper plastic, causing the lap joint short circuit between the pole and the end cover body, and thus improving the safety performance and production yield of the battery.

[0074] Optionally, as shown in Figure 6 the first section 21 and the patch body 1 form a first included angle a, and the first included angle a is 85-88°. By setting the first included angle a, on the one hand, the end cover patch 100 can be easily demolded during production, thereby simplifying the production difficulty of the end cover patch 100 and improving the production efficiency of the end cover patch 100. On the other hand, when the end cover patch 100 is attached to the end cover body and the upper plastic, the first section 21 can guide the end cover patch 100 and avoid the end of the first section 21 close to the patch body 1 from being scratched or wall-hung with the upper plastic, thereby facilitating the assembly between the end cover patch 100 and the end cover body and the upper plastic and simplifying the assembly difficulty of the end cover assembly, thereby improving the production efficiency of the end cover assembly.

[0075] Optionally, the first included angle a is 85-88°, which can be, for example, 85°, 86°, 87°, 88°, etc., and the present embodiment is not limited thereto.

[0076] Optionally, the first included angle a is 85-88°. Alternatively, the first included angle a is 85-87°. Alternatively, the first included angle a is 85-86°. Alternatively, the first included angle a is 86-88°. Alternatively, the first included angle a is 86-87°. Alternatively, the first included angle a is 87-88°, etc., and the present embodiment is not limited thereto.

[0077] Optionally, as shown in Figure 6As shown, the second segment 22 forms a second included angle β relative to the patch body 1, with the included angle β being 2°-5°. Using the second included angle β facilitates demolding of the end cap patch 100 during the production process, thereby simplifying the production difficulty of the end cap patch 100 and improving its production efficiency. Furthermore, when the end cap patch 100 is assembled onto the end cap body and the upper plastic, it provides deformation allowance, which helps improve the adhesion effect of the second segment 22, and further improves the battery's safety performance and production yield.

[0078] Optionally, the second included angle β is 2°-5°, and can be, for example, 2°, 3°, 4°, 5°, etc. This embodiment does not limit this.

[0079] Optionally, the second included angle β is 2°-5°, or it can be 3°-5°, 4°-5°, 2°-4°, 2°-3°, 3°-4°, etc., and this embodiment does not limit this.

[0080] Optionally, such as Figure 6 As shown, the connection between the extension portion 2 and the patch body 1 is a chamfered transition K, so that when the patch body 1 is attached to the end cap body, there is a gap between the patch body 1 and the outer peripheral surface of the upper plastic. By using the chamfered transition K, when the end cap patch 100 is assembled onto the end cap body and the upper plastic, it is possible to avoid overlapping between the patch body 1 and the upper plastic, which would affect the attachment effect, and it also provides deformation allowance for the extension portion 2, thereby improving the attachment effect of the end cap patch 100, and further improving the battery safety performance and production yield.

[0081] It is easy to understand that the connection between the above-mentioned extension 2 and the patch body 1 is a chamfered transition, which can be an arc chamfer or a beveled chamfer, etc. This embodiment does not limit this.

[0082] To ensure a tight fit between the end cap patch 100 and the end cap assembly, this application also includes designs to improve the adhesion strength of the end cap patch 100. Specifically, such as... Figure 6 As shown, the patch body 1 has an adhesive layer 11 on the side opposite to the extension portion 2, while the extension portion 2 overlaps at least part of the upper surface of the upper plastic.

[0083] Optionally, the extension 2 of this application does not have an adhesive layer 11, but the adhesive layer is mainly provided on the patch body 1. This is because the patch body 1 is mainly attached to the end cap body, and its coverage area on the end cap body is relatively large. The adhesive method can make the patch body 1 adhere better to the end cap body, avoiding the problem that the patch body 1 is easy to fall off the end cap body.

[0084] Since extension portion 2 extends along the outer periphery of the upper plastic and adheres to at least a portion of its upper surface, meaning the upper plastic protrudes from the end cap body and has a certain height, and the protrusion height of the upper plastic relative to the end cap body is greater than the extension length of the extension portion relative to the patch body, extension portion 2 overlaps with the surface of the upper plastic through tensile force. In this case, if an adhesive layer is provided on extension portion 2, it may easily lead to adhesive pulling between extension portion 2 and the upper plastic, which could potentially affect the adhesion between patch body 1 and the end cap body.

[0085] Based on this, this application eliminates the adhesive layer on the extended portion 2 corresponding to the upper plastic. After the end cap patch 100 is assembled onto the end cap assembly, the adhesive layer 11 ensures a tight fit between the patch body 1 and the end cap body. Furthermore, by eliminating the adhesive layer 11 on the extended portion 2, the application process avoids adhesion between the extended portion 2 and the upper plastic, which could lead to pulling and cause a loose fit between the patch body 1 and the end cap body. This improves the application effect of the end cap patch 100, thereby further enhancing the battery's safety performance and production yield.

[0086] Optionally, the adhesive layer 11 may include epoxy resin adhesive, polyurethane adhesive, acrylic adhesive, etc., and this embodiment does not limit it.

[0087] Optionally, such as Figure 5 As shown, no adhesive layer 11 is provided at the connection between the extension portion 2 and the patch body 1. If an adhesive layer 11 is provided at the connection between the extension portion 2 and the patch body 1, during the application process, the connection between the extension portion 2 and the patch body 1 may adhere to the upper plastic, causing pulling and affecting the adhesion between the patch body 1 and the end cap body. Simultaneously, the presence of the adhesive layer 11 will cause the connection between the extension portion 2 and the patch body 1 to be tightly fitted to the end cap body, thus failing to provide sufficient deformation allowance for the extension portion 2. This could lead to the extension portion 2 being stretched open and damaged by the upper plastic when the patch body 1 is pressed tightly against the end cap body to push the extension portion 2 against the upper plastic. Therefore, by not providing an adhesive layer 11 at the connection between the extension portion 2 and the patch body 1, the application effect of the end cap patch 100 can be improved, thereby further improving the battery's safety performance and production yield.

[0088] Please see Figure 7 , Figure 7is a top view of the end cover patch (including the positive electrode mark and the negative electrode mark) provided by the embodiment of the present application. As an optional implementation, the patch body 1 is provided with an explosion-proof hole 12, which is configured to avoid the setting of the explosion-proof valve of the end cover assembly, and the explosion-proof hole 12 is arranged at intervals with the extension part 2. Through the setting of the explosion-proof hole 12, the explosion-proof valve of the end cover assembly can be provided with a space for avoidance, avoiding the situation that the patch body 1 closes the explosion-proof valve of the end cover assembly, thereby avoiding affecting the normal use of the explosion-proof valve of the end cover assembly, and being conducive to improving the safety performance of the battery.

[0089] Since the battery usually has positive and negative electrodes, in order to facilitate the differentiation of the positive and negative electrodes of the battery in the process of using the battery, the present application also designs a mark on the end cover patch 100, as described below:

[0090] Optionally, as shown in (a) of Figure 7 , the patch body 1 has a positive electrode mark 13 arranged at intervals with the extension part 2.

[0091] Optionally, as shown in (b) of Figure 7 , the patch body 1 has a negative electrode mark 14 arranged at intervals with the extension part 2.

[0092] Optionally, as shown in (c) of Figure 7 , the patch body 1 has a positive electrode mark 13 and a negative electrode mark 14 arranged at intervals with the extension part 2.

[0093] In the above implementation, by setting the positive electrode mark 13 and the negative electrode mark 14, the electrode polarity of the battery can be easily distinguished by the battery cell manufacturer, the module manufacturer or the consumer, thereby providing convenience for the production and processing process or the use process.

[0094] It can be understood that the above-mentioned positive electrode mark 13 and negative electrode mark 14 can include but are not limited to pattern marks, character marks, etc. Similarly, the forming method of the above-mentioned positive electrode mark 13 and negative electrode mark 14 can include but are not limited to hole opening, etching groove, pasting mark, etc.

[0095] As an optional implementation, as shown in Figure 7 , the patch body 1 is provided with a scanning hole 15, which is configured to avoid the setting of the coding area of the end cover assembly. Through the scanning hole 15, the coding area with information tracing function on the end cover assembly can be exposed, thereby facilitating the battery production information to be traced by the battery cell manufacturer, the module manufacturer or the consumer.

[0096] Please refer to Figures 8 to 11 , Figure 8 is a structural schematic view of the end cover assembly provided by the embodiment of the present application; Figure 9 is a top view of the end cover assembly provided by the embodiment of the present application; Figure 10is Figure 9 a sectional view at B-B; Figure 11 is Figure 10 a partial enlarged view at B. In a second aspect, the embodiments of the present application further disclose an end cover assembly 200, which comprises an end cover body 201, an upper plastic 202 and the end cover patch 100 as described in the first aspect above, the end cover body 201 has a mounting hole penetrating through the thickness direction X of the end cover body 201, the upper plastic 202 is arranged on the upper surface P of the end cover body 201 corresponding to the mounting hole, the patch body 1 of the end cover patch 100 is attached to the end cover body 201, and the extension part 2 of the end cover patch 100 is attached to at least part of the upper surface M of the upper plastic 202.

[0097] The end cover assembly 200 with the end cover patch 100 of the first aspect above can also avoid the patch body 1 from being overlapped with the upper plastic 202 to affect the attachment quality of the patch body 1 and the end cover body 201, and can prevent metal or other conductive foreign matters from falling into the avoidance hole 21a to cause the short circuit of the overlap between the pole and the end cover body 201, which is beneficial to improve the safety performance and production yield of the battery.

[0098] It can be understood that the material of the upper plastic 202 above can be an insulating material such as plastic, rubber or silica gel, or a material containing a small amount of conductive agent, which is not limited in the embodiments.

[0099] Optionally, the upper plastic 202 comprises a negative electrode upper plastic and a positive electrode upper plastic. For example, when the upper plastic 202 is a negative electrode upper plastic, the material of the negative electrode upper plastic is set as an insulating material. Since the shell of the battery is generally made of metal material, in order to improve the corrosion resistance and oxidation resistance of the shell, the shell is generally positively charged, and the end cover body 201 is connected with the shell, so that the negative electrode pole of the battery needs to be insulated from the end cover body 201 by the negative electrode upper plastic. For another example, when the upper plastic 202 is a positive electrode upper plastic, the material of the positive electrode upper plastic can be set as a material containing a small amount of conductive agent or an insulating material. As known from the foregoing, the shell of the battery is generally made of metal material and is positively charged, and the end cover body 201 is connected with the shell, so that the end cover body 201 and the positive electrode pole of the battery are both positively charged, and therefore the positive electrode upper plastic and the positive electrode pole can be electrically connected or insulated.

[0100] In order to facilitate the assembly of the end cover patch 100, the size of the end cover patch 100 is designed as follows:

[0101] As an optional embodiment, the length of the first section 21 along the thickness direction X of the patch body 1 is smaller than the length of the outer circumferential surface N of the upper plastic 202 along the thickness direction X of the patch body 1. Since the extension part 2 of the patch 100 is not provided with the glue layer 11, in this way, after the patch body 1 is attached to the end cap body 201, the first section 21 is pulled to press the second section 22 to the upper plastic 202 by the patch body 1, so that the second section 22 is tightly attached to the upper surface M of the upper plastic 202, thereby avoiding the situation that the conductive medium from the attachment position between the extension part 2 and the upper plastic 202 enters the connection between the upper plastic 202 and the end cap patch 100 to cause the lap joint short circuit between the pole and the end cap body 201, which is beneficial to improve the safety performance and production yield of the battery.

[0102] As an optional embodiment, as shown in Figure 10 and Figure 11 , when the extension part 2 includes the first section 21 and the second section 22, the first section 21 has a gap between the outer circumferential surface of the upper plastic 202. In this way, the space enclosed by the first section 21 is larger than the size of the upper plastic 202, so that during the process of attaching the end cap patch 100 to the end cap body 201 and the upper plastic 202, the first section 21 and the upper plastic 202 can be prevented from interfering with each other to cause the attachment between the patch body 1 and the end cap body 201 to be not tight, thereby facilitating the assembly of the end cap patch 100 and improving the attachment effect of the end cap patch 100.

[0103] Optionally, as shown in Figure 10 and Figure 11 , the upper plastic 202 has an upper surface M and an outer circumferential surface N connected to the upper surface M, and the connection between the first section 21 and the second section 22 has a gap G to the connection between the upper surface M and the outer circumferential surface N. In this way, during the process of attaching the end cap patch 100 to the end cap body 201 and the upper plastic 202, the first section 21 and the upper plastic 202 can be prevented from interfering with each other to cause the attachment between the patch body 1 and the end cap body 201 to be not tight, and the second section 22 can be provided with a deformation allowance, thereby facilitating the attachment effect of the end cap patch 100, and further improving the safety performance and production yield of the battery.

[0104] Optionally, as shown in Figure 10 and Figure 11As shown, the gap G between the first section 21 and the outer circumferential surface N of the upper plastic 202 gradually decreases from the patch body 1 to the direction of the second section 22. In this way, when assembling the end cover patch 100, the gradually decreasing gap G between the first section 21 and the outer circumferential surface N of the upper plastic 202 can provide a guiding effect for the end cover patch 100; and can facilitate the assembly of the end cover patch 100 with the end cover body 201 and the upper plastic 202, which is conducive to simplifying the assembly difficulty of the end cover assembly 200, thereby facilitating the improvement of the production efficiency of the end cover assembly 200.

[0105] Optionally, as shown in the first section 21 and the outer circumferential surface N of the upper plastic 202 between the maximum gap L is 0.2mm-0.5mm. By setting the maximum gap L between the first section 21 and the outer circumferential surface N of the upper plastic 202, it can not only avoid the gap between the first section 21 and the outer circumferential surface N of the upper plastic 202 too large to cause the appearance of the end cover assembly 200 to decline, but also can avoid the gap between the first section 21 and the outer circumferential surface N of the upper plastic 202 too small to cause the first section 21 and the outer circumferential surface N of the upper plastic 202 to scratch, wall hanging and other interference during assembly to improve the assembly difficulty of the end cover patch 100. Figure 11 Optionally, the maximum gap L between the first section 21 and the outer circumferential surface N of the upper plastic 202 is 0.2mm-0.5mm, which can be, for example, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc. The present embodiment is not limited in this regard.

[0106] Optionally, the maximum gap L between the first section 21 and the outer circumferential surface N of the upper plastic 202 is 0.2mm-0.5mm, which can be, for example, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc. The present embodiment is not limited in this regard.

[0107] Optionally, as shown in the first section 21 and the outer circumferential surface N of the upper plastic 202 between the maximum gap L is 0.2mm-0.5mm. By setting the maximum gap L between the first section 21 and the outer circumferential surface N of the upper plastic 202, it can not only avoid the gap between the first section 21 and the outer circumferential surface N of the upper plastic 202 too large to cause the appearance of the end cover assembly 200 to decline, but also can avoid the gap between the first section 21 and the outer circumferential surface N of the upper plastic 202 too small to cause the first section 21 and the outer circumferential surface N of the upper plastic 202 to scratch, wall hanging and other interference during assembly to improve the assembly difficulty of the end cover patch 100.

[0108] Figure 11 ​As shown, the gap S between the first section 21 and the outer circumferential surface N of the upper plastic 202 at the minimum gap is 0mm-0.3mm. By setting the gap S between the first section 21 and the outer circumferential surface N of the upper plastic 202 at the minimum gap, on one hand, the gap between the first section 21 and the outer circumferential surface N of the upper plastic 202 can be avoided to be too large to cause the appearance of the end cover assembly 200 to be degraded, on the other hand, the gap can provide convenience for the assembly of the end cover patch 100, and is conducive to simplifying the assembly difficulty of the end cover assembly 200, thereby being conducive to improving the production efficiency of the end cover assembly 200.

[0109] Optionally, the gap S between the first section 21 and the outer circumferential surface N of the upper plastic 202 at the minimum gap is 0mm-0.3mm, which can be, for example, 0mm, 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, etc., which is not limited in the embodiment.

[0110] Optionally, the gap S between the first section 21 and the outer circumferential surface N of the upper plastic 202 at the minimum gap is 0mm-0.3mm, which can be, for example, 0mm, 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, etc., which is not limited in the embodiment.

[0111] As an optional embodiment, as shown in Figure 11 As shown, the extension part 2 is attached to the edge of the upper surface M of the upper plastic 202. By attaching the extension part 2 to the edge of the upper surface M of the upper plastic 202, on one hand, it can prevent metal or other conductive foreign matter from falling into the avoidance hole 21a to cause the lap short circuit between the pole and the end cover body 201, and is conducive to improving the safety performance and production yield of the battery. On the other hand, since the positive and negative upper plastics usually have different colors, and the extension part 2 is attached to the edge of the upper surface M of the upper plastic 202, the color of the upper plastic can be exposed, so that the battery manufacturers, module manufacturers or consumers can distinguish the electrode polarity of the battery, thereby providing convenience for the production process or use process.

[0112] Please refer to Figure 12 , Figure 12is a structural schematic diagram of a battery provided by an embodiment of the present application. In a third aspect, the embodiment of the present application further discloses a battery 300, which comprises a shell 301 and the end cover assembly 200 as described in the second aspect above, and the end cover assembly 200 is connected to the shell 301. The battery 300 with the end cover assembly 200 as described in the second aspect above can also avoid the lap joint of the patch body and the upper plastic to affect the coating quality of the patch body and the end cover body, and can prevent metal or other conductive foreign matter from falling into the avoidance hole to cause the lap joint short circuit between the pole and the end cover body, which is beneficial to improve the safety performance and production yield of the battery 300.

[0113] Please refer to Figure 13 , Figure 13 is a structural schematic diagram of an energy storage device provided by an embodiment of the present application. In a fourth aspect, the embodiment of the present application further discloses an energy storage device 400, which comprises the battery 300 as described in the third aspect above. The energy storage device 400 can include but is not limited to a battery module, a battery pack, a battery system, etc. The energy storage device 400 with the battery 300 as described in the third aspect above also has the end cover patch as described in the first aspect, which can also avoid the lap joint of the patch body and the upper plastic to affect the coating quality of the patch body and the end cover body, and can prevent metal or other conductive foreign matter from falling into the avoidance hole to cause the lap joint short circuit between the pole and the end cover body, which is beneficial to improve the safety performance and production yield of the energy storage device 400.

[0114] Please refer to Figure 14 , Figure 14 is a structural schematic diagram of an energy storage device provided by an embodiment of the present application. In a fourth aspect, the embodiment of the present application further discloses an energy storage device 400, which comprises the battery 300 as described in the third aspect above. The energy storage device 400 can include but is not limited to a battery module, a battery pack, a battery system, etc. The energy storage device 400 with the battery 300 as described in the third aspect above also has the end cover patch as described in the first aspect, which can also avoid the lap joint of the patch body and the upper plastic to affect the coating quality of the patch body and the end cover body, and can prevent metal or other conductive foreign matter from falling into the avoidance hole to cause the lap joint short circuit between the pole and the end cover body, which is beneficial to improve the safety performance and production yield of the energy storage device 400.

[0115] The following is described by taking the energy storage system as an example. As shown in Figure 14As shown, the household energy storage system can include an electricity conversion device 501, a user load 502, and the battery 300 or the energy storage device 400 as described above, which stores electricity of the electricity conversion device 501 and transmits electricity to the user load 502. Exemplarily, the electricity conversion device 501 can be a photovoltaic panel, the user load 502 can include street lamps and household appliances (not shown), and the battery 300 or the energy storage device 400 can be a small energy storage box which can be installed on an outdoor wall by wall hanging. The photovoltaic panel can convert solar energy into electricity during the electricity price valley period, and the battery 300 or the energy storage device 400 is used to store the electricity and supply the street lamps and household appliances for use during the electricity price peak period, or supply electricity when the power grid is disconnected.

[0116] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An end cap patch, characterized by, The end cover patch is applied to an end cover assembly, the end cover assembly comprising an end cover body and an upper plastic layer arranged on the end cover body, the end cover patch being used to cover the end cover body and the upper plastic layer, the end cover patch comprising: a patch body configured to cover the end cover body; and an extension part connected to the patch body and extending upward from the patch body, the extension part being formed with a relief hole configured to avoid the upper plastic layer, the extension part being configured to extend along the outer periphery of the upper plastic layer to fit at least part of the upper surface of the upper plastic layer in the thickness direction of the patch body.

2. The end cap patch of claim 1, wherein, The extension part comprises a first section and a second section, the first section being connected to the patch body and extending upward in the thickness direction of the patch body, the first section constituting the relief hole so that the first section is sleeved on the outer periphery of the upper plastic layer; The second section is connected to the side of the first section away from the patch body, and the second section is configured to cover at least part of the upper surface of the upper plastic layer.

3. The end cap patch of claim 2, wherein, The first section and the patch body form a first included angle, and the first included angle is 85°-88°; And / or, The second section forms a second included angle with the patch body, and the second included angle is 2°-5°.

4. The end cap patch of claim 1, wherein, The connection between the extension part and the patch body is a chamfered transition, so that when the patch body covers the end cover body, there is a gap between the patch body and the outer peripheral surface of the upper plastic layer.

5. The end cap patch of any one of claims 1-4, wherein, The side of the patch body away from the extension part is provided with a glue layer, and the extension part overlaps at least part of the upper surface of the upper plastic layer.

6. The end cap patch of claim 5, wherein, The connection between the extension part and the patch body is not provided with the glue layer.

7. The end cap patch of any one of claims 1-4, wherein, The patch body is provided with an explosion-proof hole configured to avoid the arrangement of an explosion-proof valve of the end cover assembly, and the explosion-proof hole is arranged apart from the extension part; And / or, The patch body has a positive electrode mark and / or a negative electrode mark arranged apart from the extension part.

8. An end cap assembly characterized by, Comprise: an end cover body having a mounting hole passing through in the thickness direction of the end cover body, an upper plastic layer arranged on the upper surface of the end cover body corresponding to the mounting hole; and The end cover patch of any one of claims 1-7, the patch body of the end cover patch covers the end cover body, the upper plastic layer is sleeved in the relief hole of the extension part, and the end of the extension part of the end cover patch away from the patch body fits at least part of the upper surface of the upper plastic layer.

9. The end cap assembly of claim 8, wherein, The extension part comprises a first section and a second section; The upper plastic layer has an upper surface and an outer peripheral surface connected to the upper surface, and there is a gap between the connection of the first section and the second section and the connection of the upper surface and the outer peripheral surface, and There is a gap between the first section and the outer peripheral surface of the upper plastic layer.

10. The end cap assembly of claim 9, wherein, The gap between the first section and the outer peripheral surface of the upper plastic layer gradually decreases from the patch body to the second section.

11. The end cap assembly of claim 10, wherein, a gap at a maximum gap between the first section and the outer circumferential surface of the upper plastic is 0.2mm-0.5mm; and / or, a gap at a minimum gap between the first section and the outer circumferential surface of the upper plastic is 0mm-0.3mm.

12. The end cap assembly of any one of claims 8-11, wherein, the extension portion is attached to an edge of the upper surface of the upper plastic away from an end of the patch body.

13. An energy storage device, characterized by, An energy storage device comprising a housing and an end cap assembly as claimed in any one of claims 8-12 connected to the housing.

14. An electrical device, characterized by An energy storage device as claimed in claim 13.

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