Battery and electronic equipment

Abstract

The utility model provides a battery and electronic equipment. The battery comprises a shell and a sealing assembly, a first through hole communicated with the interior of the shell is formed in the first side wall of the shell, and a first protruding part is arranged on the side, facing a second sealing piece, of a first sealing piece body of a first sealing piece in the sealing assembly; the second sealing piece is provided with a sunken part which is sunken in the direction away from the interior of the shell; an adhesive layer of the sealing assembly comprises an adhesive layer body and a second protruding part, the adhesive layer body is located between a first sealing piece and a second sealing piece, the second protruding part is bent and extends in the direction away from the interior of a shell from the end of the adhesive layer body, and the inner wall of the second protruding part is attached to the outer wall of the first protruding part; the outer wall of the second protruding part is attached to the inner wall of the concave part. The first protruding part on the first sealing piece and the concave part on the second sealing piece can generate extrusion force on the second protruding part on the adhesive layer, the extrusion force can improve the sealing reliability of the battery in normal use, and the problem of liquid leakage is avoided.

Description

Technical Field

[0001] The present application relates to the field of electrochemical energy storage devices, and in particular to a battery and electronic equipment. Background Art

[0002] Batteries are commonly used electrochemical energy storage devices, and users have increasingly higher requirements for their safety. On the one hand, in order to prevent the risk of thermal runaway, the battery needs to be depressurized before thermal runaway occurs. On the other hand, the battery needs to have good sealing under normal use.

[0003] In the related art, a sealing assembly and a through hole on a battery housing are usually used to achieve pressure relief and sealing requirements. However, the sealing of the battery in the related art is poor and leakage is likely to occur. Utility Model Content

[0004] The present application provides a battery and an electronic device, aiming to enhance the sealing of the battery and avoid leakage.

[0005] In a first aspect, a battery is provided, comprising: a first side wall, the first side wall being provided with a first through hole connected to the interior of the shell; a sealing assembly, comprising a first sealing member, a glue layer and a second sealing member, the first sealing member having a second through hole connected to the first through hole, the second sealing member being connected to the first sealing member through the glue layer and sealing the second through hole; the second sealing member having a recessed portion recessed in a direction away from the interior of the shell; the first sealing member comprising a first sealing member body and a first protruding portion, the first protruding portion being arranged on a side of the first sealing member body facing the second sealing member; the glue layer comprising a glue layer body and a second protruding portion, the glue layer body being located between the first sealing member body and the second sealing member, the second protruding portion being bent and extended from an end of the glue layer body in a direction away from the interior of the shell, the outer wall of the second protruding portion being in contact with the inner wall of the recessed portion, and the inner wall of the second protruding portion being in contact with the outer wall of the first protruding portion.

[0006] Optionally, the thickness of the second protrusion is less than or equal to the thickness of the adhesive layer body.

[0007] Optionally, the thickness of the second protrusion is greater than or equal to 20% of the thickness of the adhesive layer body.

[0008] Optionally, the first protrusion has a first edge away from the first sealing member body, the second protrusion has a second edge away from the adhesive layer body, the distance between the first edge and the first sealing member body in the first direction is a first distance, the distance between the second edge and the first sealing member body in the first direction is a second distance, and the first distance is less than or equal to the second distance.

[0009] Optionally, a ratio of the length of the second protrusion to the size of the adhesive layer body in the second direction is greater than or equal to 10%.

[0010] Optionally, the first sealing member body has a first surface facing away from the interior of the shell, and an angle between a side wall of the recessed portion and the first surface is greater than 0 degrees and less than or equal to 90 degrees.

[0011] Optionally, the height of the first protrusion is greater than or equal to the sum of the thickness of the adhesive layer body and a first dimension, and the first dimension is equal to 1 / 10 of the depth of the recessed portion.

[0012] Optionally, the adhesive layer has a third through hole, and a periphery of the third through hole extends toward the recessed portion to form the second protruding portion.

[0013] Optionally, the height of the first protrusion is less than or equal to the sum of the thickness of the adhesive layer body and the depth of the recessed portion.

[0014] Optionally, the glue layer includes a first adhesive layer and a second adhesive layer, the first adhesive layer and the second adhesive layer are stacked, the second adhesive layer is located on the side of the first adhesive layer facing away from the first side wall, and the melting point of the first adhesive layer is lower than the melting point of the second adhesive layer.

[0015] Optionally, the glue layer further includes a third adhesive layer, the third adhesive layer is located between the second adhesive layer and the second sealing member, and the melting point of the third adhesive layer is lower than the melting point of the second adhesive layer.

[0016] Optionally, the melting point of the first adhesive layer is T1, the melting point of the second adhesive layer is T2, and the melting point of the third adhesive layer is T3, satisfying at least one of the following: 95°C≤T1≤135°C, and / or 140°C≤T2≤190°C, and / or 95°C≤T3≤135°C.

[0017] Optionally, the first sealing member includes a first substrate and a first nickel layer located on a surface of the first substrate; and / or the second sealing member includes a second substrate and a second nickel layer located on a surface of the second substrate.

[0018] Optionally, the first protrusion and the recess are isolated by the adhesive layer.

[0019] Optionally, the first protrusion extends from the periphery of the second through hole to the inside of the recess.

[0020] Optionally, a third protrusion is provided on a side of the second sealing member facing away from the housing.

[0021] In a second aspect, an electronic device is provided, comprising the battery as described in the first aspect.

[0022] The sealing assembly provided in the embodiment of the present application, the first protrusion on the first sealing member and the recessed portion on the second sealing member can both generate extrusion pressure on the second protrusion on the glue layer. Therefore, the sealing assembly can not only seal the second through hole through the adhesion force on both sides of the glue layer, but also seal the second through hole through the extrusion force of the first protrusion and the recessed portion on the second protrusion, thereby avoiding interlayer detachment caused by the electrolyte or hydrofluoric acid in the battery cell continuously destroying the adhesion performance of the glue layer, improving the sealing reliability of the battery during normal use, and avoiding the problem of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of a battery in the related art.

[0024] Figure 2 A schematic diagram of the structure of a battery provided in an embodiment of the present application.

[0025] Figure 3 A schematic structural diagram of a sealing assembly provided in an embodiment of the present application.

[0026] Figure 4 A schematic cross-sectional structural diagram of a sealing assembly provided in an embodiment of the present application.

[0027] Figure 5 A schematic cross-sectional structural diagram of a sealing assembly provided in an embodiment of the present application.

[0028] Figure 6 A schematic cross-sectional structural diagram of a sealing assembly provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to facilitate understanding of the present application, the present application is described in more detail below based on exemplary embodiments and in conjunction with the accompanying drawings. The same or similar reference numerals are used in the accompanying drawings to represent the same or similar modules. It should be understood that the accompanying drawings are only exemplary and the scope of protection of the present application is not limited thereto.

[0030] It should be noted that each battery can be a secondary battery or a primary battery; for example, the battery cell can be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., which is not limited in the embodiments of the present application. The battery cell can be cylindrical, flat, rectangular, or in other shapes, etc., which is not limited in the embodiments of the present application.

[0031] In addition, the battery cell may be a wound structure or a stacked structure.

[0032] As a commonly used electrochemical energy storage device, users have increasingly higher requirements for the safety of batteries. On the one hand, thermal runaway may occur during the operation of the battery. During thermal runaway, the battery cell will emit hot gas, and the temperature or air pressure inside the battery will increase. When the internal temperature is too high or the internal air pressure is too high, the battery cell will explode. In order to ensure the safety of battery use and to avoid explosions, the battery needs to be able to release the internal gas and heat energy in a timely manner (i.e., pressure relief). On the other hand, under normal use of the battery, the sealing of the battery needs to be ensured. Once the sealing of the battery is destroyed, it will cause leakage problems, which will affect the safety of battery use.

[0033] In order to ensure that the battery can be both pressure-released and sealed, as a possible implementation method, the pressure-release and sealing can be achieved through the cooperation of the sealing component and the pressure-release hole on the battery shell. However, the existing sealing component is easily damaged by the electrolyte or hydrofluoric acid in the battery cell, resulting in poor sealing of the battery and easy leakage.

[0034] Combine the following Figure 1 , a battery 100 in the related art is described.

[0035] The battery 100 includes a shell 110 and a sealing assembly 120. A first through hole 112 is provided on the first side wall 111 of the shell 110. The sealing assembly 120 includes a sealing adhesive layer 121 and a first sealing member 122 and a second sealing member 123. The first sealing member 122 has a second through hole 1221 connected to the first through hole 112. When the battery is in normal use, the first sealing member 122 is connected to the second sealing member 123 through the sealing adhesive layer 121 and seals the first through hole 112. When the battery has thermal runaway, the heat generated inside the battery can soften or dissolve the sealing adhesive layer 121, which will loosen the second sealing member 123, so that pressure can be released through the first through hole 112.

[0036] However, during normal use of the battery 100, the inventors found that the battery had poor sealing performance and leakage, which affected the safety of the battery.

[0037] Through careful research, the inventors found that the reason why the problem of poor sealing occurs is that when the first sealing member 122 is bonded to the second sealing member 123 through the sealing adhesive layer 121 to form a composite sealing structure, the first sealing member 122, the second sealing member 123 and the sealing adhesive layer 121 are all planar, and the bonded parts (the first sealing member 122 and the second sealing member 123) on both sides of the sealing adhesive layer 121 are connected only by the adhesive force of the sealing adhesive layer 121. In the case of normal use of the battery, the electrolyte or hydrofluoric acid (HF) in the battery cell will continuously destroy the adhesive performance of the sealing adhesive layer 121, causing the adhesive performance of the sealing adhesive layer 121 to deteriorate or even lose its adhesive force, resulting in separation between the first sealing member 122, the second sealing member 123 and the sealing adhesive layer 121, thereby causing the battery's sealing to deteriorate, and eventually leakage problems will occur, affecting the safety of the battery.

[0038] In view of this, the embodiment of the present application makes the following improvements to the sealing assembly of the battery: a first protrusion is provided on the side of the first sealing member body of the first sealing member in the sealing assembly facing the second sealing member; a recessed portion recessed in a direction away from the interior of the shell is provided on the second sealing member; the glue layer of the sealing assembly includes a glue layer body and a second protrusion, the glue layer body (similar to the sealing glue layer 121 mentioned above) is located between the first sealing member body and the second sealing member, the second protrusion is bent and extended from the end of the glue layer body in a direction away from the interior of the shell, and the inner wall of the second protrusion is in contact with the outer wall of the first protrusion, and the outer wall of the second protrusion is in contact with the inner wall of the recessed portion.

[0039] The design of the recessed portion, the first raised portion and the second raised portion can make the first raised portion and the recessed portion both produce a lateral squeezing force on the second raised portion, and the inner wall of the recessed portion and the outer wall of the second raised portion are respectively fitted with the outer wall and the inner wall of the first raised portion, so as to fix the glue layer laterally, and the squeezing force can prevent the first sealing member, the second sealing member and the glue layer from detaching. Therefore, the sealing assembly can not only seal the first through hole through the bonding force between the glue layer and the first sealing member and the second sealing member, but also seal the first through hole through the squeezing force of the first raised portion and the recessed portion on the second raised portion. Even if the electrolyte or hydrofluoric acid (HF) in the battery cell will continuously destroy the bonding performance of the glue layer body, the squeezing force generated by the first raised portion and the recessed portion on the second raised portion will still maintain the glue layer and the adhered parts on both sides of the glue layer in the specified position, avoiding interlayer detachment, thereby ensuring the sealing of the battery during normal use and avoiding the problem of leakage.

[0040] Combine the following Figure 2 The battery provided in the embodiments of the present application is described in detail.

[0041] like Figure 2As shown, the battery 200 in the embodiment of the present application includes a shell 210 and a sealing assembly 220.

[0042] The housing 210 includes a plurality of side walls, which can be surrounded to form a cavity for accommodating a battery module (or battery cell). A first through hole 212 communicating with the interior (i.e., the cavity) of the housing 210 is provided on the first side wall 211 of the plurality of side walls. The first through hole 212 is used as a pressure relief hole when pressure relief is required, that is, when the battery generates thermal runaway, high-temperature gas can be discharged through the first through hole 212.

[0043] In some embodiments, the first through hole 212 may also be a liquid injection hole, that is, during the battery manufacturing process, the electrolyte may be injected into the interior of the housing 210 through the first through hole 212. After the liquid injection is completed, the first through hole 212 may be sealed using the sealing assembly 220. Of course, an additional liquid injection hole may also be provided on the housing 210 for liquid injection. Relatively speaking, using the first through hole 212 as a liquid injection hole is more conducive to the sealing of the battery and the compactness of the structure.

[0044] The embodiment of the present application does not specifically limit the shape of the first through hole 212, and the first through hole 212 can be any shape. For example, the shape of the first through hole 212 can be circular, square, waist-shaped, elliptical, triangular, special-shaped, polygonal or irregular.

[0045] The sealing assembly 220 may also be referred to as a pressure relief assembly. Figure 2-Figure 5 As shown, the sealing assembly 220 may include a glue layer 221, a first sealing member 222, and a second sealing member 223. The first sealing member 222 has a second through hole 224 communicating with the first through hole 212. Under normal circumstances, the second sealing member 223 is connected to the first sealing member 222 through the glue layer 221, and the second sealing member 223 can seal the second through hole 224 to seal the first through hole 212. When pressure relief is required, the glue layer 221 will be melted by hot air, so that the second sealing member 223 is detached, and the hot air can be discharged from the first through hole 212 or the second through hole 224.

[0046] The embodiment of the present application does not specifically limit the shape of the second through hole 224. For example, the shape of the second through hole 224 can be circular, square, waist-shaped, elliptical, triangular, special-shaped, polygonal or irregular.

[0047] The second sealing member 223 may also be referred to as a cover plate or a cover plate. Figure 4 As shown, the second sealing member 223 has a recessed portion 225 that is recessed in a direction away from the interior of the housing 210 . The recessed portion 225 may be located in a central area of ​​the second sealing member 223 .

[0048] The embodiment of the present application does not specifically limit the shape of the second sealing member 223. The shape of the second sealing member is square, waist-shaped, elliptical, triangular, irregular, polygonal, etc. Specifically, the second sealing member 223 can be a structure with a recessed portion 225 and the outer periphery of the second sealing member 223 is circular, square, waist-shaped, elliptical, triangular, irregular, polygonal, etc.

[0049] The embodiment of the present application does not specifically limit the shape of the recessed portion 225. The recessed portion 225 may be any shape that can be recessed from the first surface 2231 of the second sealing member 223 toward a direction away from the inside of the housing 210. For example, the shape of the recessed portion 225 is one of the following: a peak, a cylinder, a cone, a polygon, or a cuboid. As an implementation, the inner peripheral edge of the inner wall 2251 of the recessed portion 225 may be the same shape as the second through hole 224.

[0050] Combination Figure 2-Figure 6 As shown, the first sealing member 222 can also be called a sealing base or a sealing seat, and the first sealing member 222 includes a first sealing member body 2221 and a first protrusion 226. The first protrusion 226 is arranged on a side of the first sealing member body 2221 facing the second sealing member 223. The first protrusion 226 can be located in the central area of ​​the first sealing member 222. In some embodiments, the first protrusion 226 can extend into the recessed portion 225.

[0051] The embodiment of the present application does not specifically limit the shape of the first sealing member 222, and the shape of the first sealing member is square, waist-shaped, elliptical, triangular, irregular, polygonal, etc. Specifically, the first sealing member 222 can be a structure with a second through hole 224 and a first protrusion 226, and the outer periphery of the first sealing member 222 is circular, square, waist-shaped, elliptical, triangular, irregular, polygonal, etc. As an implementation method, the outer periphery of the first sealing member 222 is the same shape as the outer periphery of the second sealing member 223.

[0052] The embodiment of the present application does not specifically limit the shape of the first protrusion 226. The first protrusion 226 can be any shape that can protrude from the side of the first sealing member 222 facing the second sealing member 223 toward the second sealing member 223. For example, the shape of the first protrusion is one of the following: a peak, a cylinder, a cone, or a cuboid. In some embodiments, the shape of the outer peripheral edge of the first protrusion 226 can be the same as the shape of the inner wall 2251 of the recessed portion 225 of the second sealing member 223. Optionally, the shape of the outer peripheral edge of the first protrusion 226, the shape of the inner wall 2251 of the recessed portion 225 of the second sealing member 223, and the shape of the second through hole 224 are the same.

[0053] The adhesive layer 221 is used to bond the first sealing member 222 to the second sealing member 223 to seal the second through hole 224 on the second sealing member 223. The adhesive layer 221 can have a strong adhesive force when the battery is used normally. At the same time, the adhesive layer 221 can also melt when the temperature inside the battery reaches a specified temperature to destroy or lose the adhesive force. The adhesive layer 221 may include an adhesive layer body 227 and a second protrusion 228.

[0054] The adhesive layer body 227 is located between the first sealing member body 2221 and the second sealing member 223. The adhesive layer body 227 includes a first bonding surface 2271 and a second bonding surface 2272. The first bonding surface 2271 is the side of the adhesive layer body 227 facing the first sealing member 222, and the first bonding surface 2271 is used to bond with the first sealing member body 2221. The second bonding surface 2272 is the side of the adhesive layer body 227 facing the second sealing member 223, and the second bonding surface 2272 is used to bond with the second sealing member 223.

[0055] The second protrusion 228 bends and extends from the end of the adhesive layer body 227 toward a direction away from the interior of the housing 210. Figure 5 As shown, the inner wall 2281 of the second protruding portion 228 is in contact with the outer wall 2261 of the first protruding portion 226 , and the outer wall 2282 of the second protruding portion 228 is in contact with the inner wall 2251 of the recessed portion 225 .

[0056] Since the inner wall 2281 and the outer wall 2282 of the second protruding portion 228 are both fitted, the fitting can make the outer wall 2261 of the first protruding portion 226 of the first sealing member 222 and the inner wall 2251 of the recessed portion 225 of the second sealing member 223 simultaneously form an extrusion force on the second protruding portion 228 of the adhesive layer 221. Specifically, the outer wall 2261 of the first protruding portion 226 of the first sealing member 222 forms an extrusion force from the inside to the outside on the second protruding portion 228 of the adhesive layer 221, and the inner wall 2251 of the recessed portion 225 of the second sealing member 223 forms an extrusion force from the outside to the inside on the second protruding portion 228 of the adhesive layer 221.

[0057] By squeezing the inner wall 2281 and the outer wall 2282 of the second protrusion 228 at the same time, the adhesive layer 221 and the object bonded to the adhesive layer 221 (the first sealing member 222 and the second sealing member 223 ) can be firmly fixed at the squeezing position.

[0058] In the embodiment of the present application, the sealing assembly 220 can not only bond the first sealing member 222 and the second sealing member 223 together through the bonding force on both sides of the adhesive layer 221 to seal the second through hole 224, but also connect the layers of the sealing assembly together through the squeezing force of the first protrusion 226 and the recessed portion 225 on the second protrusion 228 to seal the second through hole 224. In this way, even if the electrolyte or hydrofluoric acid (HF) in the battery cell will continuously destroy the bonding performance of the adhesive layer body, the squeezing force will still maintain the adhesive layer and the adhered parts on both sides of the adhesive layer at the specified position to avoid interlayer detachment, thereby ensuring the sealing of the battery during normal use and avoiding the problem of leakage.

[0059] The embodiment of the present application does not specifically limit the formation of the second protrusion 228. As long as the second protrusion 228 is a protrusion on the adhesive layer 221 and the inner wall 2281 of the second protrusion 228 can be pressed by the outer wall 2261 of the first protrusion 226. As an implementation, the shape of the second protrusion 228 is the same as the shape of the first protrusion 226. For example, the shape of the second protrusion 228 is one of the following: a peak, a cylinder, a cone, or a cuboid.

[0060] In some embodiments, the second protrusion 228 may be formed via the first protrusion 226 during the process of bonding the first sealing member 222 to the first bonding surface 2271 .

[0061] As an example, Figure 6 As shown, the adhesive layer 221 may have a third through hole 229, and the dimension D1 of the third through hole 229 in the second direction is smaller than the dimension D2 of the outer wall 2261 of the first protrusion 226 in the second direction. When the center of the first protrusion 226 coincides with the center of the third through hole 229 and the adhesive layer 221 moves in the direction toward the first side wall 211 (or the first direction), the periphery of the third through hole 229 is contacted and pushed by the first protrusion 226 to extend in the direction away from the housing 210, so that the periphery of the third through hole 229 can be squeezed to form a shape as shown in FIG. Figure 4 The second raised portion 228 is shown.

[0062] It should be noted that if Figure 3-6 As shown, the first direction is the extension direction of the first protrusion 226, that is, the Z direction in the figure. The second direction is a direction perpendicular to the first direction, that is, the X direction and / or the Y direction in the figure.

[0063] The second protrusion 228 is formed by the third through hole 229 on the adhesive layer 221, which can ensure that the outer wall of the first protrusion 226 has sufficient squeezing force on the inner wall of the second protrusion 228, thereby further improving the sealing reliability of the battery during normal use.

[0064] It should be noted that before the second protrusion 228 is formed, Figure 6 As shown, the glue layer 221 (ie, the second protrusion 228) is about to be formed. Figure 6 The glue layer after D2-D1 in the figure (i.e., the glue layer defined by the dotted line and D1) and the glue layer body 227 on the glue layer 221 are in a flat plate shape. In other words, the glue layer 221 that is about to form the second protrusion 228 and the glue layer body 227 on the glue layer 221 together form a flat-plate-shaped glue layer 221. It can be seen that the thickness of the glue layer 221 that is about to form the second protrusion 228 is the same as the thickness of the glue layer body 227 on the glue layer 221, and this thickness is the original thickness of the glue layer 221.

[0065] The embodiment of the present application does not specifically limit the shape of the third through hole 229. For example, the shape of the third through hole 229 can be any one of a circle, a square, a waist, an ellipse, a triangle, a special shape, a polygon, etc. As an implementation, the third through hole 229 can have the same shape as the outer peripheral edge of the first protrusion 226.

[0066] In the adhesive layer 221 (eg Figure 6 As shown) to form a second protrusion 228 (as shown Figure 5 As shown), the embodiment of the present application does not specifically limit the thickness of the second protrusion 228 (ie, the distance between the inner wall 2281 of the second protrusion 228 and the outer wall 2282 of the second protrusion 228).

[0067] As an implementation, the thickness of the second protrusion 228 is less than or equal to the thickness of the adhesive layer body 227. Since the adhesive layer body 227 is substantially not squeezed or the adhesive layer body 227 is squeezed but the deformation caused by the squeezing is negligible, the thickness of the adhesive layer body 227 is close to the original thickness of the adhesive layer 221. Setting the thickness of the second protrusion 228 to be less than or equal to the thickness of the adhesive layer body 227 indicates that the second protrusion 228 is indeed formed after the adhesive layer 221 that is about to form the second protrusion 228 is squeezed.

[0068] When the thickness of the second protrusion 228 is equal to the thickness of the adhesive layer body 227, a zero gap is formed between the second protrusion 228 and the adhesives on both sides thereof (i.e., the outer wall 2261 of the first protrusion 226 and the inner wall 2251 of the recessed portion 225). When the thickness of the second protrusion 228 is less than the thickness of the adhesive layer body 227, a negative gap relative to the zero gap is formed between the second protrusion 228 and the adhesives on both sides thereof.

[0069] Preferably, the thickness of the second protrusion 228 is set to be smaller than the thickness of the adhesive layer body 227, so that the extrusion force on the inner wall 2281 of the second protrusion 228 can be increased, which is beneficial to the sealing reliability of the battery.

[0070] As a possible implementation, the thickness of the second protrusion 228 is greater than or equal to 20% of the thickness of the adhesive layer body 227 to ensure that the extruded second protrusion 228 retains the structural strength of the adhesive layer 221, thereby ensuring the stability of fixation in the second direction.

[0071] In some embodiments, the extension length (or coverage length or height) of the second protrusion 228 may exceed the top edge of the first protrusion 226. Figure 5 As shown, the first protrusion 226 has a first edge 2262 away from the first sealing member body 2221, and the second protrusion 228 has a second edge 2283 away from the adhesive layer body 227. The distance between the first edge 2262 and the first surface 2222 of the first sealing member body 2221 facing away from the inside of the shell body in the first direction is a first distance h1, and the distance between the second edge 2283 and the first surface 2222 of the first sealing member body 2221 facing away from the inside of the shell body in the first direction is a second distance h2, and the first distance h1 is less than or equal to the second distance h2.

[0072] This arrangement ensures that the second protrusion 228 can completely separate the first protrusion 226 on the first sealing member 222 from the second sealing member 223 to avoid a short circuit.

[0073] In some embodiments, the ratio of the length (or height or extension length) of the second protrusion 228 to the size of the adhesive layer body 227 in the second direction is greater than or equal to 10%. The length of the second protrusion 228 is the second distance h2 mentioned above. The size of the adhesive layer body 227 in the second direction can be as follows: Figure 6 L shown. With this arrangement, it can be ensured that the squeezed adhesive layer (ie, the second raised portion 228) has a sufficient contact area with the inner wall 2251 of the recessed portion 225 and the outer wall 2261 of the first raised portion 226, further ensuring the sealing performance.

[0074] As mentioned above, the second protrusion 228 can be formed by processing the adhesive layer 221 through the first protrusion 226. At this time, the dimension L of the adhesive layer body 227 in the second direction can be understood as the initial length of the adhesive layer 221 before the second protrusion 228 is formed (i.e. Figure 6 The length of the second protrusion 228 can be understood as the length of the squeezed glue layer on the glue layer 221 after squeezing.

[0075] In some embodiments, the angle between the side wall (inner wall 2281 or outer wall 2282) of the second protrusion 228 and the first surface 2222 mentioned above is greater than 0 degrees and less than or equal to 90 degrees. In other words, the side wall of the second protrusion 228 can be inclined or vertical relative to the horizontal plane. By setting the side wall of the extruded second protrusion 228 to be inclined or vertical, the first protrusion 226 and the recessed portion 225 can simultaneously generate vertical and horizontal extrusion forces on the second protrusion 228, further enhancing the fixing performance of the extrusion and ensuring the sealing reliability of the battery.

[0076] As described above, the outer wall 2261 of the first protrusion 226 is in contact with the inner wall 2251 of the recess 225. In some embodiments, the height of the first protrusion 226 is greater than or equal to the sum of the thickness of the adhesive layer body 227 and the first dimension. The first dimension is equal to 1 / 10 of the depth of the recess 225.

[0077] By setting the height (or length) of the first protrusion 226 as described above, it can be ensured that the first protrusion 226 can extrude the adhesive layer 221 to achieve a bending effect, so that the second protrusion 228 made by the first protrusion 226 can be fitted and fixed with the recessed portion 225, that is, the first protrusion 226 and the recessed portion 225 can jointly fix the lateral direction (i.e., the second direction) formed by the extruded adhesive layer (i.e., the second protrusion 228).

[0078] As a possible implementation, the first protrusion 226 can extend from the periphery of the second through hole 224 of the first sealing member 222 to the inside of the recessed portion 225. Preferably, the first protrusion 226 will not contact the top of the inner wall 2251 of the recessed portion 225. That is, the height of the first protrusion 226 is less than or equal to the sum of the thickness of the adhesive layer 221 and the depth of the recessed portion 225. By setting the first protrusion 226 to be able to extend from the periphery of the second through hole 224 of the first sealing member 222 to the inside of the recessed portion 225, it can be ensured that the first protrusion 226 can press the second protrusion 228 to bend and extend in a direction away from the inside of the shell, so that the first protrusion 226 and the recessed portion jointly fix the bent adhesive layer (i.e., the second protrusion 228) in the lateral direction (i.e., the second direction).

[0079] In some embodiments, the first protrusion 226 and the recessed portion 225 are isolated by a glue layer 221. Specifically, there is an extruded glue layer 221 between the outer wall 2261 of the first protrusion 226 and the inner wall 2251 of the recessed portion 225, and there is also an extruded glue layer between the first edge 2262 of the first protrusion 226 and the third edge 2252 of the recessed portion 225. The third edge 2252 of the recessed portion 225 is the edge of the inner wall 2251 of the recessed portion 225 away from the first sealing member 222. Isolating the first protrusion 226 and the recessed portion 225 by the glue layer 221 can ensure that no short circuit occurs between the first protrusion 226 and the recessed portion 225.

[0080] In other embodiments, the second protrusion 228 may be a physical protrusion of the adhesive layer 221 without any bonding. That is, when the adhesive layer 221 is not in contact with any object, the adhesive layer 221 has the adhesive layer body 227 and the second protrusion 228. The size of the second protrusion 228 is set so that when the inner wall 2281 of the second protrusion 228 is in contact with the outer wall 2261 of the first protrusion 226 and the outer wall 2282 of the second protrusion 228 is in contact with the inner wall 2251 of the recessed part 225, the outer wall of the first protrusion 226 and the inner wall of the recessed part can simultaneously generate a squeezing force on the second protrusion.

[0081] In some embodiments, Figure 6 As shown, a third protrusion 230 is provided on the side of the second sealing member 223 facing away from the housing 210. By providing the third protrusion 230, the depth dimension of the recessed portion 225 can be allowed to be larger, so that the height of the second protrusion 228 of the adhesive layer 221 can be designed to be higher. This setting can increase the adhesive force of the second protrusion 228 and the lateral extrusion force on the second protrusion 228, thereby further improving the sealing of the battery.

[0082] In some embodiments, a through hole communicating with the second through hole 224 is provided on the bottom end 2252 of the recessed portion 225, and the second sealing member 223 further includes a sealing sheet, which is disposed on the outer wall of the recessed portion at a side away from the first side wall 211 and seals the through hole. The material of the sealing sheet can be the same as or different from that of the second sealing member 223.

[0083] In some embodiments, a side of the outer wall of the recessed portion of the second sealing member 223 away from the first side wall 211 has a sink, and a sealing sheet is arranged inside the sink. By arranging the sealing sheet inside the sink, the sealing of the battery can be effectively ensured while also ensuring the aesthetics of the second sealing member 223.

[0084] The embodiment of the present application does not specifically limit the material of the first sealing member 222 .

[0085] In some embodiments, the first sealing member 222 is made of metal, which may include any metal or an alloy made of multiple metals, for example, one or more of copper, iron, aluminum, tin, lead, steel, and nickel.

[0086] As an implementation method, the first sealing member 222 may include a first substrate and a first nickel layer located on the surface of the first substrate. The first substrate may be a metal. The first nickel layer has good electrolyte resistance. The first substrate may be the same as or different from the third substrate, and the first nickel layer may have the same or different thickness as the third nickel layer. By setting the first sealing member 222 as the first substrate and the first nickel layer located on the surface of the first substrate, the electrolyte resistance of the first sealing member 222 can be improved and the adhesive layer can be better adapted, further improving the sealing of the battery.

[0087] The material of the second sealing member 223 is not specifically limited in the embodiment of the present application. The material of the second sealing member 223 may be the same as or different from the material of the first sealing member.

[0088] In some embodiments, the second sealing member 223 is made of metal, which may include any metal or an alloy made of multiple metals, for example, one or more of copper, iron, aluminum, tin, lead, steel, and nickel.

[0089] As an implementation method, the second sealing member 223 may include a second substrate and a second nickel layer located on the surface of the second substrate. The second substrate may be a metal. The second nickel layer has good electrolyte resistance. The second substrate may be the same as or different from the first substrate, and the second nickel layer may have the same or different thickness as the first nickel layer. By configuring the second sealing member 223 as a second substrate and a second nickel layer located on the surface of the second substrate, the electrolyte resistance of the second sealing member 223 can be improved and the adhesive layer can be better adapted, further improving the sealing of the battery.

[0090] The material of the adhesive layer 221 is not specifically limited in the embodiment of the present application. For example, the adhesive layer 221 is a material with a melting point between 80° C. and 240° C. As an example, the material of the adhesive layer includes one or more of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyetheretherketone, polyimide, polyamide, polyethylene glycol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylenenaphthalene, polyvinylidene fluoride, polyethylene naphthalate, polypropylene carbonate, poly(vinylidene fluoride-hexafluoropropylene), poly(vinylidene fluoride-co-chlorotrifluoroethylene), silicone, vinylon, polypropylene, anhydride-modified polypropylene, polyethylene, ethylene and its copolymers, polyvinyl chloride, polystyrene, polyether nitrile, polyurethane, polyphenylene oxide, polyester, polysulfone, amorphous α-olefin copolymer and its derivatives.

[0091] The embodiment of the present application does not specifically limit the structure of the adhesive layer 221. As an implementation, the adhesive layer 221 includes a first adhesive layer and a second adhesive layer, the first adhesive layer and the second adhesive layer are stacked, the second adhesive layer is located on the side of the first adhesive layer facing away from the first side wall, and the melting point T1 of the first adhesive layer is less than the melting point T2 of the second adhesive layer.

[0092] By setting the glue layer 221 to include a first adhesive layer and a second adhesive layer, the first adhesive layer close to the shell can be squeezed to prevent the electrolyte or hydrofluoric acid (HF) from entering the cross-section between the glue layer 221 and the first side wall (or the second sealing member 223); at the same time, when activated by high temperature, the second adhesive layer will not melt or overflow excessively, and the second adhesive layer can better form a better bonding interface with the first sealing member, thereby preventing the electrolyte or hydrofluoric acid (HF) from entering the bonding interface between the glue layer 221 and the first sealing member.

[0093] In some embodiments, the glue layer 221 further includes a third adhesive layer, the third adhesive layer is located between the second adhesive layer and the second sealing member, and the melting point T3 of the third adhesive layer is less than the melting point T2 of the second adhesive layer. By adding a third adhesive layer between the second adhesive layer and the first sealing member, the electrolyte or hydrofluoric acid (HF) can be further dispersed, the corrosion rate of the electrolyte or hydrofluoric acid (HF) on each bonding interface can be slowed down, and the service life of the battery can be improved.

[0094] The embodiment of the present application does not specifically limit the melting point T1 of the first adhesive layer, the melting point T2 of the second adhesive layer, or the melting point T3 of the third adhesive layer, as long as the above conditions are met. As an implementation method, the melting point T1 of the first adhesive layer, the melting point T2 of the second adhesive layer, and the melting point T3 of the third adhesive layer meet at least one of the following: 95℃≤T1≤135℃, and / or 140℃≤T2≤190℃, and / or, 95℃≤T3≤135℃.

[0095] The present application also provides an electric device using the battery described above as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. The electric device may also be referred to as an electronic device.

[0096] It should be understood that in the various embodiments of the present application, the size of the serial number of the above process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0097] It should be noted that the various elements described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present application will not further describe various possible combinations. For example, in some examples, the outer periphery of the piston body and the inner wall of the piston head can be respectively provided with mutually matching flanges and sliding grooves, so that the piston can rotate relative to the piston body around the above axis.

[0098] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into separate multiple components and / or parts. The disclosure "one" or "an" used to describe a component or part is not intended to exclude other components or parts.

[0099] It should be understood that although the terms “first” or “second” etc. may be used in the present application to describe various elements, these elements are not defined by these terms, and these terms are only used to distinguish one element from another.

[0100] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery, characterized in that: include: The housing comprises a first side wall, wherein the first side wall is provided with a first through hole communicating with the interior of the housing; A sealing component, comprising a first sealing member, an adhesive layer and a second sealing member, wherein the first sealing member has a second through hole communicating with the first through hole, and the second sealing member is connected to the first sealing member through the adhesive layer and seals the second through hole; The second sealing member has a recessed portion recessed in a direction away from the interior of the shell; The first sealing member comprises a first sealing member body and a first protrusion, wherein the first protrusion is arranged on a side of the first sealing member body facing the second sealing member; The adhesive layer includes an adhesive layer body and a second protrusion, the adhesive layer body is located between the first sealing member body and the second sealing member, the second protrusion is bent and extended from the end of the adhesive layer body toward a direction away from the interior of the shell, the outer wall of the second protrusion is in contact with the inner wall of the recessed portion, and the inner wall of the second protrusion is in contact with the outer wall of the first protrusion.

2. The battery according to claim 1, characterized in that The thickness of the second protrusion is less than or equal to the thickness of the adhesive layer body.

3. The battery according to claim 1, characterized in that The thickness of the second protrusion is greater than or equal to 20% of the thickness of the adhesive layer body.

4. The battery according to claim 1, characterized in that The first protrusion has a first edge away from the first sealing member body, the second protrusion has a second edge away from the adhesive layer body, the first edge is at a first distance from the first sealing member body in a first direction, the second edge is at a second distance from the first sealing member body in the first direction, and the first distance is less than or equal to the second distance.

5. The battery according to claim 1, characterized in that The ratio of the length of the second protrusion to the dimension of the adhesive layer body in the second direction is greater than or equal to 10%.

6. The battery according to claim 1, characterized in that The first sealing member body has a first surface facing away from the interior of the shell, and an angle between a side wall of the recessed portion and the first surface is greater than 0 degrees and less than or equal to 90 degrees.

7. The battery according to any one of claims 1 to 6, characterized in that The height of the first protrusion is greater than or equal to the sum of the thickness of the adhesive layer body and a first dimension, and the first dimension is equal to 1 / 10 of the depth of the recess.

8. The battery according to any one of claims 1 to 6, characterized in that The adhesive layer has a third through hole, and the periphery of the third through hole extends toward the recessed portion to form the second protruding portion.

9. The battery according to any one of claims 1 to 6, characterized in that The height of the first protrusion is less than or equal to the sum of the thickness of the adhesive layer body and the depth of the recess.

10. The battery according to any one of claims 1 to 6, characterized in that The glue layer includes a first adhesive layer and a second adhesive layer, the first adhesive layer and the second adhesive layer are stacked, the second adhesive layer is located on the side of the first adhesive layer facing away from the first side wall, and the melting point of the first adhesive layer is lower than the melting point of the second adhesive layer.

11. The battery according to claim 10, characterized in that The glue layer further includes a third adhesive layer, the third adhesive layer is located between the second adhesive layer and the second sealing member, and the melting point of the third adhesive layer is lower than the melting point of the second adhesive layer.

12. The battery according to claim 11, characterized in that The melting point of the first adhesive layer is T1, the melting point of the second adhesive layer is T2, and the melting point of the third adhesive layer is T3, and at least one of the following is satisfied: 95℃≤T1≤135℃, and / or 140℃≤T2≤190℃, and / or 95℃≤T3≤135℃。 13. The battery according to any one of claims 1 to 6, characterized in that The first sealing member includes a first substrate and a first nickel layer located on a surface of the first substrate; and / or the second sealing member includes a second substrate and a second nickel layer located on a surface of the second substrate.

14. The battery according to any one of claims 1 to 6, characterized in that The first protruding portion and the recessed portion are isolated by the adhesive layer.

15. The battery according to any one of claims 1 to 6, characterized in that The first protrusion extends from the periphery of the second through hole to the inside of the recess.

16. The battery according to claim 1, characterized in that A third protrusion is provided on a side of the second sealing member facing away from the housing.

17. An electronic device, characterized in that: Comprising a battery as described in any one of claims 1-16.

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