Battery

Abstract

A battery (10). The battery (10) comprises a casing (100), a battery cell located in the casing (100), a sealing cover (200) and a sealant (300). The casing (100) is provided with an electrolyte injection port (110), the sealing cover (200) covering the electrolyte injection port (110) and being connected to the casing (100). The sealing cover (200) is provided with a through hole (210), the through hole (210) connecting the inner and outer sides of the casing (100), and the sealant (300) filling and sealing the through hole (210). While it is ensured that the electrolyte injection port (110) has good sealing performance, when it is required to relieve the internal pressure of the battery (10), the sealant (300) can be melted at a high temperature, such that the pressure can be relieved from the through hole (210). At the room temperature, the sealing cover (200) fits the sealant (300) to have good strength and stability, so as to prevent the battery (10) from cracking when falling off or suffering impact.

Description

Battery

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 29, 2023, with application number 202323663212.1 and application name "Battery", the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery. Background Art

[0003] Batteries are widely used in various power supply devices, including consumer electronics, new energy vehicles, and energy storage devices. Batteries have different sizes and structures depending on the application scenario, and the battery casing can be made of different materials.

[0004] In the related art, an injection hole needs to be opened on the battery shell for injecting electrolyte into the battery. After injection, the injection hole needs to be sealed with a sealing cover to prevent leakage of the electrolyte. At the same time, in order to provide a pressure relief function, the sealing cover needs to be thinned. In this way, under special circumstances, the high pressure inside the battery can break through the sealing cover and release the pressure.

[0005] However, in the current battery structure, the sealing cover is easily cracked when the battery falls or is impacted, and the safety and reliability of the battery are insufficient.

[0006] Summary of the Invention

[0007] In view of the above problems, an embodiment of the present application provides a battery to solve the technical problem that the sealing cover in the current battery structure is prone to cracking when the battery falls or is impacted, resulting in insufficient safety and reliability of the battery.

[0008] In order to achieve the above-mentioned purpose, the present application provides a battery, which includes a shell, a battery cell located in the shell, a sealing cover and a sealing colloid, the shell has a liquid injection port, the sealing cover is arranged on the liquid injection port and is connected to the shell; the sealing cover has a through hole, the through hole connects the inner and outer sides of the shell; the sealing colloid fills and seals the through hole.

[0009] The battery provided in the embodiment of the present application is provided with a through hole on the sealing cover and sealed with a meltable sealing colloid. While ensuring that the liquid filling port has good sealing, when the pressure inside the battery needs to be released, the sealing colloid can melt at a high temperature to release the pressure from the through hole. At normal temperature, the sealing cover and the sealing colloid have good strength and stability to prevent the battery from cracking when it falls or is impacted.

[0010] In some embodiments, the melting point of the sealant is greater than or equal to 100° C. and less than or equal to 130° C.

[0011] In some embodiments, the diameter of the through-hole may be greater than or equal to 0.5 mm.

[0012] In some embodiments, a height dimension of the sealing cover along the axial direction of the through hole is greater than or equal to 0.3 mm and less than or equal to 2 mm.

[0013] In some embodiments, the lower surface of the sealing colloid overflows to the outside of the through hole and is less than or equal to 0.3 mm from the bottom surface of the sealing cover; and / or, the upper surface of the sealing colloid overflows to the outside of the through hole and is less than or equal to 0.2 mm from the top surface of the seal.

[0014] In some embodiments, a projection of the sealant in the first direction covers a projection of the sealing cover in the first direction.

[0015] In some embodiments, the sealing cover has a groove, the sealing colloid is located in the groove, the through hole is located at the bottom of the groove, and the sealing colloid covers the through hole.

[0016] In some embodiments, the sealing glue fills the groove; at least a portion of the sealing glue overflows outside the groove.

[0017] In some embodiments, the outer edge of the sealing colloid overflowing from the groove exceeds the edge of the sealing cover, and the distance from the edge of the sealing cover is greater than or equal to 0.2 mm; and / or the height of the sealing colloid overflowing from the groove is less than or equal to 0.1 mm.

[0018] In some embodiments, the sealing cover is welded to the outer wall of the shell, a weld mark is formed between the sealing cover and the shell, and the sealing colloid at least partially covers the weld mark.

[0019] In some embodiments, the sealing cover and the shell are connected by hot-melt adhesive and hot-melt adhesive overflows from the edge of the sealing cover.

[0020] In some embodiments, the sealant contacts the overflowed hot melt adhesive.

[0021] In some embodiments, the sealing colloid may include a plurality of sealing layers, and the plurality of sealing layers are sequentially arranged along the axial direction of the through hole.

[0022] In some embodiments, the battery may further include a pole arranged on the shell, the battery cell includes a first pole tab and a second pole tab, the pole and the first pole tab are connected, and the distance between the bottom wall of the sealing cover and the inner wall of the shell is smaller than the distance between the bottom wall of the pole and the inner wall of the shell.

[0023] In some embodiments, the battery may further include an adapter plate connected to the outer wall of the housing, and the upper surface of the sealing colloid is lower than the upper surface of the adapter plate.

[0024] In some embodiments, the sidewall of the cross section of the sealing cover is inclined; or, the sidewall of the cross section of the sealing cover has a stepped structure.

[0025] In some embodiments, the hardness of the sealant is greater than or equal to 30 HB and less than or equal to 100 HB.

[0026] In some embodiments, the sealant has a fluorescent agent therein.

[0027] In some embodiments, the shell includes a shell body and an extension portion extending outward from the shell body. The battery includes a pole located in the extension portion, the pole extending along the second direction, and the sealing colloid and the sealing cover are located in the extension portion.

[0028] In some embodiments, the top surface of the sealant does not exceed the top surface of the housing.

[0029] In some embodiments, the sealant has an I-shaped structure.

[0030] The present application provides a battery, which includes a shell, a sealing cover and a sealing colloid. The shell has a liquid injection port, and the sealing cover is arranged on the liquid injection port and connected to the shell; the sealing cover has a through hole, which connects the inner and outer sides of the shell; the sealing colloid fills and seals the through hole. While ensuring that the liquid injection port has good sealing performance, when the pressure inside the battery needs to be relieved, the sealing colloid can melt at a high temperature to release the pressure from the through hole. At normal temperature, the sealing cover and the sealing colloid have good strength and stability to prevent the battery from cracking when it falls or is impacted.

[0031] In addition to the technical problems solved by the present application, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the battery provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] FIG1 is a structural schematic diagram of a battery provided in an embodiment of the present application;

[0034] FIG2 is a second structural diagram of a battery provided in an embodiment of the present application;

[0035] FIG3 is an exploded view of a battery provided in an embodiment of the present application;

[0036] FIG4 is a first cross-sectional view of a battery provided in an embodiment of the present application;

[0037] FIG5 is a second cross-sectional view of a battery provided in an embodiment of the present application;

[0038] FIG6 is a third cross-sectional view of a battery provided in an embodiment of the present application;

[0039] FIG7 is a fourth cross-sectional view of the battery provided in an embodiment of the present application.

[0040] Explanation of the accompanying reference numerals: 10 - battery; 100 - housing; 101 - extension portion; 110 - liquid filling port; 200 - sealing cover; 210 - through hole; 220 - groove; 300 - sealing colloid; 310 - sealing layer; 400 - pole; 500 - adapter; 600 - insulating mounting member; 700 - electrical connection piece; 800 - insulating sheet. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] Batteries are widely used in various power supply devices, including consumer electronics, new energy vehicles, and energy storage devices. Batteries have different sizes and structures depending on the application scenario, and the battery shell can be made of different materials. Currently, the battery shell needs to be equipped with an injection hole for injecting electrolyte into the battery. After injection, the injection hole needs to be sealed with a sealing cap to prevent electrolyte leakage. At the same time, in order to provide a pressure relief function, the sealing cap needs to be thinned. In this way, under special circumstances, the high pressure inside the battery can break through the sealing cap and release the pressure.

[0043] However, in the current battery structure, the sealing cap needs to be designed to be thinner, resulting in insufficient structural strength of the sealing cap. The sealing cap is prone to cracking when the battery falls or is impacted, resulting in insufficient safety and reliability of the battery.

[0044] The present application provides a battery, which provides a through hole on the sealing cover and uses a meltable sealing colloid to seal the through hole. While ensuring that the liquid filling port has good sealing, when the pressure inside the battery needs to be released, the sealing colloid can melt at a high temperature to allow the pressure to be released from the through hole. At normal temperature, the sealing cover and the sealing colloid have good strength and stability, thereby preventing the battery from cracking when it falls or is impacted, thereby improving the stability and reliability of the battery.

[0045] The following describes the battery of the embodiment of the present application with reference to the accompanying drawings. It should be noted that the battery provided in the embodiment of the present application can be a secondary battery, that is, the battery in the embodiment of the present application can be charged and discharged and recycled. The specific type of battery can include but is not limited to lithium batteries, lithium cobalt oxide batteries, lithium iron phosphate batteries, ternary batteries, etc., and the battery and the scenarios in which the battery can be used include but are not limited to electronic products, communication equipment, vehicles, etc., such as mobile phones, computers, new energy vehicles and other products, which are not specifically limited in the embodiment of the present application.

[0046] Figure 1 is a structural schematic diagram of the battery provided in an embodiment of the present application. Figure 2 is a structural schematic diagram of the battery provided in an embodiment of the present application. Figure 3 is an exploded view of the battery provided in an embodiment of the present application. Figure 4 is a cross-sectional view of the battery provided in an embodiment of the present application.

[0047] Referring to Figures 1 to 4 , an embodiment of the present application provides a battery 10 comprising a housing 100, a battery cell located within the housing 100, a sealing cap 200, and a sealing colloid 300. The housing 100 has a liquid injection port 110, and the sealing cap 200 is disposed over the liquid injection port 110 and connected to the housing 100. The sealing cap 200 has a through hole 210 connecting the inside and outside of the housing 100, and the sealing colloid 300 fills and seals the through hole 210.

[0048] It can be understood that the shell 100 has a accommodating cavity inside, and the battery cell 10 is arranged in the accommodating cavity. The shell 100 can inject electrolyte into the accommodating cavity through the injection port 110, and the battery cell is immersed in the electrolyte. After the electrolyte is injected, the injection port 110 is sealed by the sealing cover 200, and the sealing colloid 300 can seal the through hole 210 to ensure that the injection port 110 has good sealing properties.

[0049] It should be noted that in the battery 10 provided in the embodiment of the present application, by providing a through hole 210 on the sealing cover 200 and using a meltable sealing colloid 300 to seal the through hole 210, while ensuring that the liquid filling port 110 has good sealing, when the pressure inside the battery 10 needs to be released, the sealing colloid 300 can melt at a high temperature so that the pressure can be released from the through hole 210. At normal temperature, the sealing cover 200 and the sealing colloid 300 have good strength and stability to prevent the battery 10 from cracking when it falls or is impacted.

[0050] In addition, the shell 100 can be made of conductive metal, including but not limited to aluminum, iron and other metals or alloys. The embodiment of the present application does not specifically limit the type of metal material used.

[0051] In some embodiments, the sealing colloid 300 has good corrosion resistance to prevent corrosion by the electrolyte. Exemplary materials that can be used for the sealing colloid 300 include, but are not limited to, polystyrene, polypropylene, polyethylene, polyester, polyvinyl chloride, polyimide, acrylonitrile-butadiene-styrene plastic, polycarbonate, polyamide, acid-modified resin, polyethylene, polyhydroxyacetylethylenediamine, modified polyolefin resin, polyolefin, polyvinyl chloride, fluororubber, other polyolefins and their copolymers, epoxy acrylate, and polyurethane acrylate, etc., which are not specifically limited in the present embodiment.

[0052] It is understood that when the pressure inside the housing 100 is too high and needs to be relieved, the temperature inside the housing 100 will also rise. Therefore, the sealing colloid 300 can melt under the high temperature inside the housing 100, thereby making the through hole 210 conductive and releasing the pressure. The melting point of the sealing colloid 300 can be greater than or equal to 100°C and less than or equal to 130°C.

[0053] For example, the melting point of the sealing colloid 300 may be 100° C., 101° C., 110° C., 120° C., 129° C., 130° C., etc., which is not specifically limited in the embodiments of the present application.

[0054] The specific dimensions of the sealing cover 200 are described in detail below.

[0055] FIG5 is a second cross-sectional view of a battery provided in an embodiment of the present application;

[0056] Continuing with FIG5 and in conjunction with FIG1 to FIG3 , in some embodiments, the diameter of through hole 210 can be greater than or equal to 0.5 mm. This allows for pressure relief within housing 100, and after the sealing strip melts, through hole 210 has a sufficient diameter to discharge high-pressure gas, thereby increasing the speed of pressure relief and ensuring good safety.

[0057] For example, the through hole 210 may be a circular hole, and the diameter of the through hole 210 may be D. The specific value of D may be 0.5 mm, 0.51 mm, 0.6 mm, 0.8 mm, 1 mm, 2 mm, 5 mm, etc., and the embodiment of the present application does not make any specific limitation on this.

[0058] In some embodiments, the height of the sealing cover 200 along the axial direction of the through hole 210 is greater than or equal to 0.3 mm and less than or equal to 2 mm. This ensures good structural strength and a good connection between the sealant 300 and the sealing cover 200 while preventing the sealing cover 200 from occupying too much space within the housing 100, thereby ensuring reasonable space utilization.

[0059] For example, the height dimension of the sealing cover 200 along the axial direction of the through hole 210 can be H, and the specific value of H can be 0.3mm, 0.4mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 4.5mm, 4.9mm, or 5mm, which is not specifically limited in the embodiments of the present application.

[0060] In some embodiments, the lower surface of the sealant 300 overflows to the outside of the through hole 210 , and the distance from the bottom surface of the sealing cover 200 is less than or equal to 0.3 mm.

[0061] For example, the thickness dimension of the lower surface of the sealing colloid 300 overflowing from the bottom of the sealing cover 200 may be h1. The specific value of h1 may be 0.01 mm, 0.1 mm, 0.2 mm, 0.29 mm, 0.3 mm, etc., which is not specifically limited in the embodiment of the present application.

[0062] In some embodiments, the upper surface of the sealant 300 overflows to the outside of the through hole 210 , and the distance from the top surface of the seal is less than or equal to 0.2 mm.

[0063] For example, the thickness dimension of the upper surface of the sealing colloid 300 that overflows the top surface of the sealing cover 200 may be h2. The specific value of h2 may be 0.01 mm, 0.1 mm, 0.19 mm, 0.2 mm, etc., which is not specifically limited in the embodiment of the present application.

[0064] In some embodiments, the projection of the sealant 300 in the first direction covers the projection of the sealing cover 200 in the first direction. The first direction is the thickness direction of the housing 100, that is, the first direction corresponds to the X direction in FIG.

[0065] It should be noted that the sealing cover 200 may be a sheet-like structure. After the upper and lower sides of the sealing colloid 300 overflow from the upper and lower ends of the through hole 210 , the cross-section of the sealing colloid 300 is in an I-shape.

[0066] FIG6 is a third cross-sectional view of the battery provided in an embodiment of the present application, and FIG7 is a fourth cross-sectional view of the battery provided in an embodiment of the present application.

[0067] Referring to Figures 6 and 7 , in conjunction with Figures 1 to 4 , in some embodiments, the sealing cap 200 has a groove 220, with the sealant 300 positioned within the groove 220. The through-hole 210 is positioned at the bottom of the groove 220, with the sealant 300 covering the through-hole 210. This provides a larger contact surface between the sealant 300 and the sealing cap 200, improving the reliability of the bonding between the sealant 300 and the sealing cap 200. Furthermore, the placement of the sealant 300 within the groove 220 increases the thickness of the sealant 300, resulting in a better sealing effect.

[0068] For example, the sealing glue 300 may be filled only in the groove 220 , that is, the sealing glue 300 may not overflow to the outside of the groove 220 , or the sealing glue 300 may overflow to the outside of the groove 220 .

[0069] In some embodiments, the sealant 300 may completely fill the groove 220 . At least a portion of the sealant 300 may overflow outside the groove 220 , thereby increasing the coverage area of ​​the sealant 300 .

[0070] The outer edge of the sealant 300 that overflows outside the groove 220 extends beyond the edge of the sealing cover 200 and is at least 0.2 mm away from the edge of the sealing cover 200. The height of the sealant 300 that overflows outside the groove 220 is less than or equal to 0.1 mm. This maintains a nearly flat exterior of the housing 100 while also increasing the coverage of the sealant 300 and achieving a better connection.

[0071] For example, the distance w from the outer edge of the sealing colloid 300 overflowing the groove 220 to the edge of the sealing cover 200 is exceeded. The specific value of w can be 0.2 mm, 0.21 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc., which is not specifically limited in the embodiment of the present application.

[0072] For example, the height of the sealing colloid 300 overflowing the groove 220 may be h. The specific value of h may be 0.01 mm, 0.02 mm, 0.05 mm, 0.08 mm, 0.09 mm, 0.1 mm, etc., which is not specifically limited in the embodiment of the present application.

[0073] In some embodiments, the sealing cover 200 is welded to the outer wall of the housing 100, leaving a weld mark between the sealing cover 200 and the housing 100, and the sealant 300 at least partially covers the weld mark. This prevents the weld mark from contacting external electronic components and causing a short circuit.

[0074] In other embodiments, the sealing cover 200 and the housing 100 are connected by hot-melt adhesive. The hot-melt adhesive overflows from the edge of the sealing cover 200, and the sealing adhesive 300 contacts the overflowed hot-melt adhesive. In this way, the bonding strength between the sealing cover 200 and the housing 100 can be improved.

[0075] In some embodiments, the sealing colloid 300 may include a plurality of sealing layers 310 , and the plurality of sealing layers 310 are sequentially arranged along the axial direction of the through hole 210 .

[0076] For example, there may be two sealing layers 310. The sealing layer 310 located near the outside may be made of a waterproof material, which has better waterproof performance and prevents water vapor from entering the interior of the housing 100. The sealing layer 310 located near the inside may be made of an anti-corrosion material, which has a better effect of preventing electrolyte corrosion.

[0077] In some embodiments, the battery 10 may further include a terminal 400, and the distance between the bottom wall of the sealing cover 200 and the inner wall of the housing 100 is smaller than the distance between the bottom wall of the terminal 400 and the inner wall of the housing 100. The battery cell includes a first tab and a second tab, and the terminal 400 is connected to the first tab.

[0078] The terminal 400 can be a positive terminal. The bottom surface of the terminal 400 is further away from the inner wall of the housing 100. This allows the portion of the sealing cover 200 inside the housing 100 to reuse the space formed between the terminal 400 and the inner wall of the housing 100, improving space utilization and preventing the recessed portion of the sealing cover 200 from occupying other space inside the housing 100, thereby increasing the energy density of the battery 10. In addition, an insulating mounting member 600 is provided between the terminal 400 and the housing 100, and an electrical connection piece 700 is provided inside the housing 100. The terminal 400 is connected to the electrode of the battery cell via the electrical connection piece 700, and an insulating sheet 800 is provided between the electrical connection piece 700 and the inner wall of the housing 100.

[0079] In some embodiments, the battery 10 may further include an adapter plate 500 , which is connected to the outer wall of the housing 100 , and the upper surface of the sealant 300 is lower than the upper surface of the adapter plate 500 .

[0080] The adapter plate 500 can be a negative electrode adapter plate, which can be welded to the outer wall of the shell 100. The upper surface height of the sealing colloid 300 is lower than the height of the adapter plate 500, which can ensure that the outer wall of the shell 100 has good flatness.

[0081] In some embodiments, the sidewalls of the cross section of the sealing cover 200 can be inclined. Alternatively, the sidewalls of the cross section of the sealing cover 200 can have a stepped structure. This allows the high-pressure gas within the housing 100 cavity to more easily dissipate the melted sealing colloid 300 after it melts, thereby relieving pressure more quickly.

[0082] The embodiment of the present application does not specifically limit the inclination angle or step size of the side wall of the sealing cover 200 .

[0083] In some embodiments, the hardness of the sealing colloid 300 is greater than or equal to 30 HB and less than or equal to 100 HB, thereby ensuring that the sealing colloid 300 has good structural reliability in a cured state.

[0084] For example, the specific hardness value of the sealing colloid 300 may be 30HB, 31HB, 40HB, 50HB, 60HB, 70HB, 80HB, 90HB, 99HB, or 100HB, which is not specifically limited in the embodiment of the present application.

[0085] In some embodiments, the sealant 300 contains a fluorescent agent. When irradiated with special light from outside, including but not limited to ultraviolet light, infrared light, etc., the fluorescent agent may be extended, thereby facilitating better detection of the shape of the sealant 300.

[0086] In some embodiments, the shell 100 includes a shell body and an extension portion 101 extending outward from the shell body. The battery 10 includes a pole 400 located in the extension portion 101 . The pole 400 extends along the second direction. The sealing gel 300 and the sealing cover 200 are located in the extension portion 101 .

[0087] The second direction is the thickness direction of the battery, that is, the second direction corresponds to the Y direction in FIG. 4 .

[0088] In some embodiments, the top surface of the sealant 300 does not exceed the top surface of the housing 100 to ensure the flatness of the top surface of the housing 100 .

[0089] The following is an exemplary description of the assembly process of the sealing cover 200.

[0090] For example, during the specific assembly process, the sealing colloid 300 can be first injected into the groove 220 of the sealing cover 200. After the sealing colloid 300 is cured, the sealing cover 200 and the sealing colloid 300 form a whole. Thereafter, the sealing cover 200 is placed on the liquid injection port 110 of the shell 100, and the sealing cover 200 and the shell 100 are laser welded. Finally, the sealing colloid 300 is laid to cover the weld mark formed by the welding.

[0091] The present application provides a battery 10, which includes a shell 100, a sealing cover 200 and a sealing colloid 300. The shell 100 has a liquid injection port 110, and the sealing cover 200 is covered on the liquid injection port 110 and connected to the shell 100; the sealing cover 200 has a through hole 210, which connects the inner and outer sides of the shell 100; the sealing colloid 300 fills and seals the through hole 210. While ensuring that the liquid injection port 110 has good sealing, when the pressure inside the battery 10 needs to be released, the sealing colloid 300 can melt at high temperature to allow the pressure to be released from the through hole 210. At normal temperature, the sealing cover 200 and the sealing colloid 300 have good strength and stability to prevent the battery 10 from cracking when it falls or is impacted.

[0092] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0093] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0094] The terms "first," "second," "third," "fourth," and so on (if any) in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequential sequence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the application described herein can be implemented in orders other than those illustrated or described herein.

[0095] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that, It includes a housing, an electric core located inside the housing, a sealing cover, and a sealing colloid. The housing has a liquid injection port, and the sealing cover is provided on the liquid injection port and connected to the housing; the sealing cover has a through hole, and the through hole communicates with the inside and outside of the housing; the sealing colloid fills and seals the through hole.

2. The battery according to claim 1, characterized in that, The melting point of the sealing colloid is greater than or equal to 100 °C and less than or equal to 130 °C; and / or, The diameter of the through hole is greater than or equal to 0.5 mm; and / or, The height dimension of the sealing cover along the axial direction of the through hole is greater than or equal to 0.3 mm and less than or equal to 2 mm.

3. The battery according to claim 1 or 2, characterized in that, The lower surface of the sealing colloid overflows to the outside of the through hole, and the distance from the bottom surface of the sealing cover is less than or equal to 0.3 mm; and / or, the upper surface of the sealing colloid overflows to the outside of the through hole, and the distance from the top surface of the sealing cover is less than or equal to 0.2 mm.

4. The battery according to claim 1 or 2, characterized in that, The projection of the sealing colloid in the first direction covers the projection of the sealing cover in the first direction.

5. The battery according to claim 1 or 2, characterized in that, The sealing cover has a groove, the sealing colloid is located in the groove, the through hole is located at the bottom of the groove, and the sealing colloid covers the through hole.

6. The battery according to claim 5, characterized in that, The sealing colloid fills the groove; at least part of the sealing colloid overflows to the outside of the groove.

7. The battery according to claim 5, wherein The outer edge of the sealing colloid that overflows to the outside of the groove extends beyond the edge of the sealing cover, and the distance from the edge of the sealing cover is greater than or equal to 0.2 mm; and / or, the height of the sealing colloid that overflows to the outside of the groove is less than or equal to 0.1 mm.

8. The battery according to claim 1 or 2, characterized in that, The sealing cover is welded to the outer wall of the housing, there is a welding mark between the sealing cover and the housing, and the sealing colloid at least partially covers the welding mark.

9. The battery according to claim 1 or 2, characterized in that, The sealing cover and the housing are connected by hot pressing with hot melt adhesive, and the hot melt adhesive overflows from the edge of the sealing cover.

10. The battery according to claim 9, characterized in that, The sealing colloid contacts the overflowed hot melt adhesive.

11. The battery according to claim 1 or 2, characterized in that, The sealing colloid includes a plurality of sealing layers, and the plurality of sealing layers are arranged in sequence along the axial direction of the through hole.

12. The battery according to claim 1 or 2, characterized in that, It further includes a pole column provided on the housing. The electric core includes a first pole ear and a second pole ear. The pole column is connected to the first pole ear, and the distance between the bottom wall of the sealing cover and the inner wall of the housing is less than the distance between the bottom wall of the pole column and the inner wall of the housing.

13. The battery according to claim 1 or 2, characterized in that, It further includes a connecting piece, the connecting piece is connected to the outer wall of the housing, and the upper surface of the sealing colloid is lower than the upper surface of the connecting piece.

14. The battery according to claim 1 or 2, characterized in that, The side wall of the cross-section of the sealing cover is inclined; or, the side wall of the cross-section of the sealing cover has a stepped structure.

15. The battery according to claim 1 or 2, characterized in that, The hardness of the sealing colloid is greater than or equal to 30 HB and less than or equal to 100 HB; there is a fluorescent agent in the sealing colloid.

16. The battery according to claim 1 or 2, characterized in that, The housing includes a housing body and an extension part extending outward from the housing body. The battery includes a pole column located in the extension part. The pole column extends in the second direction. The sealing colloid and the sealing cover are located in the extension part.

17. The battery according to claim 16, characterized in that, The top surface of the sealing colloid does not exceed the top surface of the housing.

18. The battery according to claim 17, wherein The sealing colloid has an I-shaped structure.

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