Shell, battery and electronic equipment

Abstract

The utility model discloses a shell, battery and electronic equipment, the shell comprises: a body, the body is provided with a storage cavity for placing a battery cell, the body comprises a first surface, the first surface is opposite to the cavity wall of the storage cavity, and the first surface is provided with a first explosion-proof groove; and the first adhesive layer is arranged in the first explosion-proof groove. According to the anti-explosion shell, the first face is opposite to the cavity wall of the storage cavity, the first face is provided with a first anti-explosion groove, and in the prior art, the groove wall of the first anti-explosion groove is thin, so that when the shell falls off, the first anti-explosion groove can be damaged and broken, and in the anti-explosion shell, after the first glue layer is arranged in the first anti-explosion groove, the first anti-explosion groove can not be damaged. The first adhesive layer can increase the mechanical strength of the first anti-explosion groove, so that the first anti-explosion groove is effectively prevented from being damaged when falling off. Specifically, the explosion-proof valve of the shell can effectively avoid the problem of failure.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a shell, a battery and an electronic device. Background Art

[0002] In the related art, the battery has an explosion-proof valve. When abnormal heat is generated inside the battery due to overcharging, over-discharging, short circuit or external impact, resulting in an increase in internal pressure, the explosion-proof valve can serve as a pressure release channel to promptly release the gas accumulated inside, thereby reducing the pressure inside the battery. By releasing the internal pressure in a timely manner, the explosion-proof valve can effectively prevent the battery from exploding due to excessive internal pressure. The explosion-proof valve can be specifically formed by carving a groove on the surface of the cover plate. Since the bottom wall of the groove is relatively thin, when the internal pressure of the battery is relatively high, the gas can break through the groove wall, thereby achieving a pressure relief effect. In some cases, when the battery falls, the thinner groove wall will be damaged and break open, rendering the explosion-proof valve ineffective. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides a housing, the explosion-proof valve of which can effectively avoid the problem of failure.

[0004] The utility model also provides a battery.

[0005] The utility model also provides an electronic device.

[0006] According to the first embodiment of the present invention, the housing includes:

[0007] A body, the body being provided with a storage cavity for accommodating the battery cell, the body comprising a first surface, the first surface being opposite to a cavity wall of the storage cavity, and the first surface being provided with a first explosion-proof groove;

[0008] The first adhesive layer is disposed in the first explosion-proof groove.

[0009] The housing according to the embodiment of the present invention has at least the following beneficial effects: the first surface is opposite to the wall of the storage cavity, and a first explosion-proof groove is provided on the first surface. In the prior art, the groove wall of the first explosion-proof groove is relatively thin, so when the housing falls, the first explosion-proof groove may be damaged and broken. However, in the present application, by providing the first adhesive layer in the first explosion-proof groove, the first adhesive layer can increase the mechanical strength of the first explosion-proof groove, thereby effectively preventing the first explosion-proof groove from being damaged when falling. Specifically, the explosion-proof valve of the housing can effectively avoid the problem of failure.

[0010] According to the housing of some embodiments of the present invention, the first adhesive layer completely fills the first explosion-proof groove.

[0011] According to the shell of some embodiments of the present invention, the first adhesive layer includes a main body and a protruding portion, the protruding portion is connected to the main body and protrudes relative to the main body, the protruding portion is arranged in the explosion-proof groove, and the main body is connected to the first surface.

[0012] According to some embodiments of the shell of the present invention, along the thickness direction of the first surface, the size of the main body is L, 0.1mm≤L≤2mm.

[0013] According to the housing of some embodiments of the present invention, the protruding portion has a protruding dimension B relative to the main body, and 0.1 mm ≤ B ≤ 3 mm.

[0014] According to the housing of some embodiments of the present invention, the melting point of the first adhesive layer is 95° C. to 110° C.

[0015] According to the housing of some embodiments of the present invention, the depth of the first explosion-proof groove is H1, the thickness of the first surface is H2, and 0.7≤H1 / H2≤0.9.

[0016] According to some embodiments of the present invention, the housing further includes a second adhesive layer, the cavity wall of the storage cavity is further provided with a second explosion-proof groove, and the second adhesive layer is provided in the second explosion-proof groove.

[0017] A battery according to an embodiment of the second aspect of the present invention includes the housing of any one of the embodiments of the first aspect.

[0018] The battery according to the embodiment of the present invention has at least the following beneficial effects: the first surface is opposite to the wall of the storage cavity, and a first explosion-proof groove is provided on the first surface. In the prior art, the groove wall of the first explosion-proof groove is relatively thin, so when the shell falls, the first explosion-proof groove may be damaged and broken. In the present application, by providing the first adhesive layer in the first explosion-proof groove, the first adhesive layer can increase the mechanical strength of the first explosion-proof groove, thereby effectively preventing the first explosion-proof groove from being damaged when falling. Specifically, the explosion-proof valve of the shell can effectively avoid the problem of failure. Furthermore, the battery with this shell is safer.

[0019] An electronic device according to an embodiment of the third aspect of the present invention includes the battery in the embodiment of the second aspect.

[0020] The electronic device according to the embodiment of the present invention has at least the following beneficial effects: the first surface is opposite to the wall of the storage cavity, and a first explosion-proof groove is provided on the first surface. In the prior art, the groove wall of the first explosion-proof groove is relatively thin, so when the shell falls, the first explosion-proof groove may be damaged and broken. In the present application, by providing the first adhesive layer in the first explosion-proof groove, the first adhesive layer can increase the mechanical strength of the first explosion-proof groove, thereby effectively preventing the first explosion-proof groove from being damaged when it falls. Specifically, the explosion-proof valve of the shell can effectively avoid the problem of failure. Furthermore, the battery with the shell is safer. Furthermore, the electronic device with the battery is also safer.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 Schematic diagrams of housings of some embodiments of the present invention;

[0024] Figure 2 Schematic cross-sectional views of housings of some embodiments of the present invention;

[0025] Figure 3 It is a partial cross-sectional schematic diagram of the housing of the first embodiment of the present utility model;

[0026] Figure 4 It is a partial cross-sectional schematic diagram of a housing of a second embodiment of the present utility model;

[0027] Figure 5 A partial cross-sectional schematic diagram of a housing according to a third embodiment of the present utility model;

[0028] Figure 6 A partial cross-sectional schematic diagram of a housing according to a fourth embodiment of the present utility model;

[0029] Figure 7 It is a partial cross-sectional schematic diagram of a housing according to a fifth embodiment of the present invention.

[0030] Reference numerals:

[0031] The housing 100 , the body 200 , the first surface 210 , the first explosion-proof groove 220 , the storage cavity 230 , the first adhesive layer 240 , the body portion 241 , the protruding portion 242 , the second explosion-proof groove 250 , and the second adhesive layer 260 . DETAILED DESCRIPTION

[0032] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0034] In the description of this utility model, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of the terms "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0035] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0036] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0037] In the related art, batteries have explosion-proof valves. When abnormal heat is generated within the battery due to overcharging, over-discharging, short circuiting, or external impact, causing internal pressure to rise, the explosion-proof valve acts as a pressure release channel, promptly releasing accumulated gas and thus reducing internal pressure. By promptly releasing internal pressure, the explosion-proof valve effectively prevents the battery from exploding due to excessive internal pressure. The explosion-proof valve can be formed by carving a groove into the surface of the cover plate. Because the bottom wall of the groove is relatively thin, when the internal pressure of the battery is high, the gas can break through the groove wall, thereby relieving pressure. In some cases, a drop of the battery can damage the thin groove wall and rupture it, rendering the explosion-proof valve ineffective. In addition, during battery manufacturing, if the interior of the housing 100 is pressurized or squeezed against the explosion-proof valve, the explosion-proof valve can also rupture due to damage to the thin groove wall. To this end, the present application proposes a housing 100.

[0038] Please refer to Figures 1 to 6 In some embodiments, the housing 100 includes: a body 200 and a first adhesive layer 240. The body 200 is provided with a storage cavity for placing the battery cell. The body 200 may include two parts, which may be a cover and an outer shell, wherein the cover is plate-shaped and the outer shell may be square, rectangular, or cylindrical. The outer shell has a storage cavity 230, which has an opening. The cover seals the opening of the storage cavity 230, thereby making the storage cavity 230 a closed cavity. The body 200 includes a first surface 210, a second surface, a third surface, and a fourth surface. The first surface 210 and the second surface are arranged opposite each other, and the third surface and the fourth surface are arranged opposite each other. The first surface 210 is opposite to the cavity wall of the storage cavity 230. That is, the surface of the body 200 includes an inner surface and an outer surface. The cavity wall of the storage cavity 230 refers to the inner surface, and the surface opposite to it is the outer surface. The first surface 210 refers to the outer surface. The first surface 210 is provided with a first explosion-proof groove 220. The shape of the first explosion-proof groove 220 is not specifically limited. For example, the cross section of the first explosion-proof groove 220 can be U-shaped, square or triangular, etc. For details, please refer to FIG. Figure 6Specifically, when the body 200 includes a cover and a housing, the first explosion-proof groove 220 can be located on the outer surface of either the cover or the housing. When the first explosion-proof groove 220 is located on the first surface 210, battery safety is improved. The first adhesive layer 240 is located within the first explosion-proof groove 220. Specifically, the first surface 210 and the walls of the storage cavity 230 face each other, and the first explosion-proof groove 220 is located on the first surface 210. In the prior art, the walls of the first explosion-proof groove 220 are relatively thin, so if the housing 100 is dropped, the first explosion-proof groove 220 may be damaged and ruptured. However, in the present application, by disposing the first adhesive layer 240 within the first explosion-proof groove 220, the first adhesive layer 240 increases the mechanical strength of the first explosion-proof groove 220, effectively preventing damage to the first explosion-proof groove 220 in the event of a drop. Specifically, the explosion-proof valve (first explosion-proof groove 220) of the housing 100 can effectively prevent failure.

[0039] To further explain, after the first adhesive layer 240 is installed in the first explosion-proof groove 220, it not only effectively protects the first explosion-proof groove 220 from failure, but also does not affect the normal operation of the first explosion-proof groove 220. Specifically, when the housing 100 is dropped or subjected to pressure, the first adhesive layer 240 can increase the strength of the first explosion-proof groove 220, thereby effectively preventing failure of the first explosion-proof groove 220. When a battery cell is installed in the housing 100 and the battery cell experiences thermal runaway, the high heat and pressure in the storage cavity 230 of the housing 100 will melt the first adhesive layer 240, which will then break through the groove wall of the first explosion-proof groove 220, thereby relieving pressure. The groove wall of the first explosion-proof groove 220 specifically refers to the wall surface opposite the groove opening of the first explosion-proof groove 220.

[0040] Furthermore, there may be multiple situations in which the first adhesive layer 240 is disposed in the first explosion-proof groove 220. In the first situation, taking the cross-section of the first explosion-proof groove 220 as an example, the first adhesive layer 240 may be disposed in the first explosion-proof groove 220 so that the first adhesive layer 240 covers the wall surface of the first explosion-proof groove 220 facing the opening, wherein the thickness of the first adhesive layer 240 is one-quarter to three-quarters of the thickness of the first explosion-proof groove 220. In the second case, continuing with the example of the first explosion-proof groove 220 having a square cross section, the first adhesive layer 240 is disposed in the first explosion-proof groove 220. Specifically, the first adhesive layer 240 covers the wall of the first explosion-proof groove 220 facing the opening, wherein the thickness of the first adhesive layer 240 is equal to the thickness of the first explosion-proof groove 220, that is, the width of the first adhesive layer 240 is equal to the width of the first explosion-proof groove 220, the length of the first adhesive layer 240 is equal to the length of the first explosion-proof groove 220, and the height of the first adhesive layer 240 is equal to the depth of the first explosion-proof groove 220. In the third case, continuing with the example of the first explosion-proof groove 220 having a square cross section, the first adhesive layer 240 is disposed in the first explosion-proof groove 220. Specifically, after the first adhesive layer 240 fills the first explosion-proof groove 220, some parts of the first adhesive layer 240 are still located outside the first explosion-proof groove 220. For details, please refer to Figure 3 In some embodiments, the first adhesive layer 240 completely fills the first explosion-proof groove 220. The second situation may be that the first adhesive layer 240 completely fills the first explosion-proof groove 220. After the first adhesive layer 240 completely fills the first explosion-proof groove 220, the mechanical strength of the first explosion-proof groove 220 can be effectively improved, thereby effectively preventing failure of the first explosion-proof groove 220. Specifically, the first adhesive layer 240 completely fills the first explosion-proof groove 220 by filling the first explosion-proof groove 220 with adhesive liquid and then waiting for the adhesive liquid to solidify.

[0041] Furthermore, the first explosion-proof groove 220 can be completely filled with the first glue layer 240 to increase the mechanical strength of the first explosion-proof groove. In the process of injecting glue into the first explosion-proof groove 220, how to make the glue just fill the first explosion-proof groove 220 is more critical. If the glue is injected less, it will not be possible to completely fill the first explosion-proof groove 220. Therefore, the glue injection process needs to be more precise, which will reduce work efficiency. Therefore, in order to improve work efficiency, please refer to Figure 3 and Figure 4In some embodiments, the first adhesive layer 240 includes a main body 241 and a protrusion 242. The protrusion 242 is connected to the main body 241 and protrudes relative to the main body 241. The protrusion 242 is disposed in the explosion-proof groove, while the main body 241 is connected to the first surface 210. That is, during the glue injection process, the glue can overflow the first explosion-proof groove 220, thereby improving work efficiency. After the glue solidifies, the main body 241 and the protrusion 242 are formed. The protrusion 242 is disposed in the explosion-proof groove, and the main body 241 is connected to the first surface 210.

[0042] For further information, please refer to Figure 3 and Figure 4 In some embodiments, along the thickness direction of the first surface 210, the size of the main body 241 is L, 0.1mm≤L≤2mm. Specifically, the size of the main body 241 can be 0.1mm, 0.5mm, 1mm, 1.5mm or 2mm. When the size of the main body 241 is greater than 2mm, since the first glue layer 240 has already filled the first explosion-proof groove 220, the larger thickness of the main body 241 will lead to material waste and increase the manufacturing cost of the shell 100. When the size of the main body 241 is less than 0.1mm, due to the smaller size of the main body 241, it will be more difficult to control the amount of glue injected during the glue injection process, which will result in lower work efficiency.

[0043] For further information, please refer to Figure 3 and Figure 4 In some embodiments, the protrusion 242 protrudes from the main body 241 by a dimension B, where 0.1 mm ≤ B ≤ 3 mm. Specifically, the protrusion 242 protrudes from the main body 241 by a dimension B, where 0.1 mm ≤ B ≤ 3 mm. Specifically, the protrusion 242 protrudes from the main body 241 by a dimension B greater than 3 mm. Since the first adhesive layer 240 has already filled the first explosion-proof groove 220, the excessive protrusion of the protrusion 242 may result in material waste and increase the manufacturing cost of the housing 100. When the protrusion 242 protrudes from the main body 241 by a dimension B less than 0.1 mm, since the protrusion 242 protrudes from the main body 241 by a smaller dimension, it may be difficult to control the amount of glue injected during the glue injection process, resulting in lower work efficiency.

[0044] Furthermore, in some embodiments, the melting point of the first adhesive layer 240 is 95°C to 110°C. The melting point of the first adhesive layer 240 may be 95°C, 98°C, 100°C, 105°C, 108°C, or 110°C. When the battery is in thermal runaway, the temperature of the battery is approximately 130°C. Since it takes some time for the first adhesive layer 240 to melt, the melting point of the first adhesive layer 240 can be set to no more than 110°C. Thus, when thermal runaway of the battery begins to occur, the first adhesive layer 240 will melt in advance. After the first adhesive layer 240 melts, it is easy for the groove wall of the first explosion-proof groove 220 to break open under the pressure inside the shell 100, thereby achieving a pressure relief effect. Furthermore, it is further explained that the reason why the melting point of the first adhesive layer 240 is not lower than 95° C. is that if the melting point of the first adhesive layer 240 is lower, then under normal circumstances, the first adhesive layer 240 may melt due to the excessively high temperature of the surrounding environment of the battery, and thus the first adhesive layer 240 may not effectively protect the first explosion-proof groove 220 from accidental rupture.

[0045] Furthermore, in some embodiments, the material of the first adhesive layer 240 may be polypropylene adhesive. Polypropylene adhesive has excellent properties such as high bonding strength, high elasticity, soft adhesive film, non-toxic cured product, and excellent water resistance, heat resistance, acid and alkali resistance, and corrosion resistance. In addition to polypropylene adhesive, the material of the first adhesive layer 240 may also be one of EVA hot melt adhesive, polyester hot melt adhesive, polyamide hot melt adhesive, and polyethylene hot melt adhesive.

[0046] Furthermore, it is conceivable that the greater the depth of the first explosion-proof groove 220, the smaller the thickness of the groove wall opposite to the opening of the first explosion-proof groove 220. In this way, even if the pressure value in the storage chamber 230 is very small, the groove wall of the first explosion-proof groove 220 can be easily broken to release the pressure. Figure 3 and Figure 4 In some embodiments, the depth of the first explosion-proof groove 220 is H1, the thickness of the first surface 210 is H2, and 0.7≤H1 / H2≤0.9. The ratio of H1 / H2 can be 0.7, 0.8, 0.85, or 0.9. When the ratio of H1 / H2 is less than 0.7, the depth of the first explosion-proof groove 220 is small, and the thickness of the wall of the first explosion-proof groove 220 opposite to the opening is large, which will result in the first explosion-proof groove 220 being able to break open only when the pressure inside the shell 100 is very high. When the ratio of H1 / H2 is greater than 0.9, the depth of the first explosion-proof groove 220 is large, and the thickness of the wall of the first explosion-proof groove 220 opposite to the opening is small, which will increase the difficulty of processing the first explosion-proof groove 220.

[0047] For further information, please refer to Figure 7In some embodiments, the wall of the storage cavity 230 is further provided with a second explosion-proof groove 250. That is, the main body 200 includes an outer surface and an inner surface, the outer surface includes the first surface 210, and the inner surface is the wall of the storage cavity 230. The shell 100 also includes a second adhesive layer 260, and the second adhesive layer 260 is disposed in the second explosion-proof groove 250. After the second explosion-proof groove 250 is provided on the wall of the storage cavity 230, the second explosion-proof groove 250 and the first explosion-proof groove 220 cooperate with each other to improve the safety of the battery. It should be noted that after the second adhesive layer 260 is provided in the second explosion-proof groove 250, the second adhesive layer 260 can increase the mechanical strength of the second explosion-proof groove 250, thereby effectively preventing the second explosion-proof groove 250 from being damaged when it falls.

[0048] In some embodiments, the battery includes the shell 100 of any of the above embodiments. Specifically, the first surface 210 and the cavity wall of the storage cavity 230 are opposite to each other, and a first explosion-proof groove 220 is provided on the first surface 210. In the prior art, the groove wall of the first explosion-proof groove 220 is relatively thin, so when the shell 100 falls, the first explosion-proof groove 220 may be damaged and broken. In the present application, by providing the first adhesive layer 240 in the first explosion-proof groove 220, the first adhesive layer 240 can increase the mechanical strength of the first explosion-proof groove 220, thereby effectively preventing the first explosion-proof groove 220 from being damaged when falling. Specifically, the explosion-proof valve of the shell 100 can effectively avoid the problem of failure. Furthermore, the battery with the shell 100 is safer.

[0049] In some embodiments, an electronic device includes the battery of the above-described embodiment. Specifically, the first surface 210 and the wall of the storage cavity 230 face each other, and a first explosion-proof groove 220 is provided on the first surface 210. In the prior art, the groove wall of the first explosion-proof groove 220 is relatively thin, so when the housing 100 falls, the first explosion-proof groove 220 may be damaged and broken. In the present application, by providing the first adhesive layer 240 in the first explosion-proof groove 220, the first adhesive layer 240 can increase the mechanical strength of the first explosion-proof groove 220, thereby effectively preventing the first explosion-proof groove 220 from being damaged when falling. Specifically, the explosion-proof valve of the housing 100 can effectively avoid the problem of failure. Furthermore, the battery with the housing 100 is safer. Furthermore, the electronic device with the battery is also safer.

[0050] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. In addition, the embodiments of the present invention and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. A housing, characterized in that include: A body, the body being provided with a storage cavity for accommodating the battery cell, the body comprising a first surface, the first surface being opposite to a cavity wall of the storage cavity, and the first surface being provided with a first explosion-proof groove; The first adhesive layer is disposed in the first explosion-proof groove.

2. The housing according to claim 1, wherein: The first adhesive layer completely fills the first explosion-proof groove.

3. The housing according to claim 2, wherein: The first adhesive layer includes a main body and a protruding portion, the protruding portion is connected to the main body and protrudes relative to the main body, the protruding portion is arranged in the explosion-proof groove, and the main body is connected to the first surface.

4. The housing according to claim 3, wherein: Along the thickness direction of the first surface, the size of the main body is L, 0.1 mm ≤ L ≤ 2 mm.

5. The housing according to claim 3, wherein: The protruding portion has a protruding dimension B relative to the main body, and 0.1 mm ≤ B ≤ 3 mm.

6. The housing according to claim 1, wherein: The melting point of the first adhesive layer is 95° C. to 110° C.

7. The housing according to claim 1, wherein: The depth of the first explosion-proof groove is H1, the thickness of the first surface is H2, and 0.7≤H1 / H2≤0.

9.

8. The housing according to claim 1, wherein: The shell further includes a second adhesive layer, the cavity wall of the storage cavity is further provided with a second explosion-proof groove, and the second adhesive layer is provided in the second explosion-proof groove.

9. A battery, characterized in that Comprising the housing according to any one of claims 1 to 8.

10. An electronic device, characterized in that A battery comprising the battery of claim 9.

Images