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 the first side wall, of a first sealing piece body of a first sealing piece in the sealing assembly; an adhesive layer of the sealing assembly is arranged to comprise an adhesive layer body and a second protruding part, the adhesive layer body is located between the first sealing piece and the first side wall, the second protruding part is bent and extends from the end of the adhesive layer body to the direction close to the interior of the shell, and the inner wall of the second protruding part is attached to the outer wall of the first protruding part. The first protruding part on the first 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 particularly to a battery and an electronic device. Background Art

[0002] A battery is a commonly used electrochemical energy storage device, and users have higher and higher requirements for its safety. On the one hand, in order to prevent the risk of thermal runaway of the battery, it is necessary to relieve the pressure of the battery before thermal runaway. On the other hand, when the battery is in normal use, it needs to have good sealing performance.

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

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

[0005] In a first aspect, a battery is provided, including: a housing, including a first side wall, and a first through hole communicating with the inside of the housing is provided on the first side wall; a sealing component, including an adhesive layer and a first sealing member, the first sealing member seals the first through hole through the adhesive layer; the first sealing member includes a first sealing member body and a first protrusion, the first protrusion is provided on a side of the first sealing member body facing the first side wall; 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 first side wall, the second protrusion bends and extends from an end of the adhesive layer body towards the direction close to the inside of the housing, and an inner wall of the second protrusion fits with an outer wall of the first protrusion.

[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, and the second protrusion has a second edge away from the adhesive layer body; a distance between the first edge and the first sealing member body in a first direction is a first distance, a 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 a length of the second protrusion to a dimension of the adhesive layer body in a second direction is greater than or equal to 10%.

[0010] Optionally, the first sealing member body has a first surface facing the first side wall, and the included angle between the side wall of the second protrusion and the first surface is greater than 0 degree 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 thickness of the first side wall or the second sealing member.

[0012] Optionally, the first protrusion has a through hole extending along the height direction of the first protrusion and communicating with the second through hole, and the first sealing member further includes a sealing piece, and the sealing piece is disposed on a side of the first sealing member body away from the first side wall and seals the through hole.

[0013] Optionally, a sunken platform is provided on a side of the first sealing member body away from the first side wall, and the sealing piece is disposed inside the sunken platform.

[0014] Optionally, the adhesive layer has a second through hole, and a periphery of the second through hole extends towards the inside of the housing to form the second protrusion.

[0015] Optionally, a plurality of protrusions are provided on the first sealing member body, and the plurality of protrusions correspond to a plurality of adhesive layers and a plurality of through holes on the first side wall.

[0016] Optionally, the adhesive 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 a side of the first adhesive layer facing away from the first side wall, and the melting point of the first adhesive layer is less than the melting point of the second adhesive layer.

[0017] Optionally, the adhesive layer further includes a third adhesive layer, the third adhesive layer is located between the second adhesive layer and the first sealing member body, and the melting point of the third adhesive layer is less than the melting point of the second adhesive layer.

[0018] 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.

[0019] Optionally, the first sealing member includes a first base material and a first nickel layer on a surface of the first base material.

[0020] Optionally, the sealing component further includes: a second sealing member located between the adhesive layer and the first side wall. The second sealing member has a third through hole communicating with the first through hole, and the outer wall of the second protrusion is attached to the inner wall of the third through hole.

[0021] Optionally, the second sealing member includes a second base material and a second nickel layer located on the surface of the second base material.

[0022] Optionally, the first protrusion extends from the first sealing member body to the inside of the third through hole.

[0023] Optionally, the first protrusion and the third through hole are isolated by the adhesive layer.

[0024] Optionally, the shape of the first protrusion is one of the following: spiked, cylindrical, conical, or cuboid.

[0025] Optionally, the first protrusion passes through the first through hole and extends into the interior of the housing.

[0026] In a second aspect, an electronic device is provided, including the battery as described in the first aspect.

[0027] In the sealing component provided by the embodiments of the present application, the first protrusion on the first sealing member can generate an extrusion force on the second protrusion on the adhesive layer. Therefore, this sealing component can not only seal the first through hole through the adhesive force between the adhesive layer and the first sealing member, but also seal the first through hole through the extrusion force of the first protrusion on the second protrusion, avoiding the interlayer separation caused by the continuous damage of the adhesive performance of the adhesive layer by the electrolyte or hydrofluoric acid in the battery cell, improving the sealing reliability of the battery during normal use, and avoiding the problem of liquid leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of a battery in the related art.

[0029] Figure 2 It is a schematic structural diagram of a battery provided by an embodiment of the present application.

[0030] Figure 3 It is a schematic structural diagram of a sealing component provided by an embodiment of the present application.

[0031] Figure 4 It is a schematic cross-sectional structural diagram of a sealing component provided by an embodiment of the present application.

[0032] Figure 5 It is a schematic structural diagram of a sealing component provided by an embodiment of the present application.

[0033] Figure 6Schematic diagram of a first sealing member provided by an embodiment of the present application. Detailed implementation manners

[0034] To facilitate the understanding of the present application, the present application will be described in more detail below based on exemplary embodiments in conjunction with the accompanying drawings. The same or similar reference numerals are used in the drawings to represent the same or similar modules. It should be understood that the drawings are only schematic, and the protection scope of the present application is not limited thereto.

[0035] 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, a magnesium-ion battery, etc., and the embodiments of the present application are not limited thereto. The battery cell can be in a cylindrical shape, a flat shape, a cuboid shape or other shapes, etc., and the embodiments of the present application are not limited thereto either.

[0036] In addition, the battery cell can be a wound structure or a stacked structure.

[0037] As a commonly used electrochemical energy storage device, users have higher and higher requirements for the safety of batteries. On the one hand, during the operation of the battery, thermal runaway may occur. During thermal runaway, the battery cell will eject high-temperature gas, and the internal temperature or pressure of the battery will increase. When the internal temperature is too high or the internal pressure is too large, the battery cell will explode. To ensure the safe use of the battery and avoid explosion, the battery needs to be able to release the internal gas and heat energy (i.e., relieve pressure) in a timely manner. On the other hand, under normal use conditions of the battery, the sealing performance of the battery needs to be ensured. Once the sealing performance of the battery is damaged, the problem of liquid leakage will occur, which will affect the safety of battery use.

[0038] To ensure that the battery can relieve pressure and be sealed at the same time, as a possible implementation manner, pressure relief and sealing can be achieved through the cooperation of the sealing component and the pressure relief hole on the battery housing. However, the existing sealing member assembly is easily damaged by the electrolyte or hydrofluoric acid in the battery cell, resulting in poor sealing performance of the battery and easy occurrence of liquid leakage.

[0039] The following will be combined with Figure 1 to describe the battery 100 in the related art.

[0040] The battery 100 includes a housing 110 and a sealing component 120. A pressure relief hole 112 is provided on the first side wall 111 of the housing 110. The sealing component 120 includes a sealing glue layer 121 and a sealing member 122. When the battery is in normal use, the sealing member 122 seals the pressure relief hole 112 through the sealing glue layer 121. When the battery undergoes thermal runaway, the heat generated inside the battery can soften or dissolve the sealing glue layer 121, which will cause the sealing member 122 to become loose, so that pressure relief can be carried out.

[0041] However, during the normal use of the battery 100, the inventor found that the battery had poor sealing performance and there was a phenomenon of liquid leakage, which affected the safety of battery use.

[0042] Through careful research, the inventor found that the reason for the poor sealing performance was that when the sealing member 122 was bonded to the pressure relief hole 112 through the sealing adhesive layer 121 to seal the pressure relief hole 112, both the sealing member 122 and the sealing adhesive layer 121 were planar, and the bonded parts (sealing member 122 and side wall 111) on both sides of the sealing adhesive layer 121 were only connected through the bonding force of the sealing adhesive layer 121. Under the normal use conditions of the battery, the electrolyte or hydrofluoric acid (HF) in the battery cell would continuously damage the bonding performance of the sealing adhesive layer 121, making the bonding performance of the sealing adhesive layer 121 worse or even losing the bonding force, which would cause a separation between the sealing member 122 and the sealing adhesive layer 121, resulting in poor sealing performance of the battery and finally liquid leakage problems, affecting the safety of battery use.

[0043] In view of this, the embodiments of the present application have made the following improvements to the sealing assembly of the battery: a first protrusion is provided on one side of the first sealing member body of the first sealing member in the sealing assembly facing the first side wall; the adhesive layer of the sealing assembly is set to include an adhesive layer body and a second protrusion, the adhesive layer body (similar to the sealing adhesive layer 121 in the above text) is located between the first sealing member body and the first side wall, and the second protrusion bends and extends from the end of the adhesive layer body towards the direction close to the inside of the housing, and the inner wall of the second protrusion fits with the outer wall of the first protrusion.

[0044] The design of the first protrusion and the second protrusion can cause the first protrusion to generate a lateral extrusion force on the second protrusion, and the inner wall of the second protrusion fits with the outer wall of the first protrusion, thereby laterally fixing the adhesive layer. This extrusion force can prevent the first sealing member and the adhesive layer from separating. Therefore, the sealing assembly can not only seal the first through hole through the bonding force between the adhesive layer and the first sealing member, but also seal the first through hole through the extrusion force of the first protrusion on the second protrusion. Even if the electrolyte or hydrofluoric acid (HF) in the battery cell continuously damages the bonding performance of the adhesive layer body, the extrusion force generated by the first protrusion on the second protrusion will still maintain the adhesive layer and the bonded parts on both sides of the adhesive layer in the designated position, avoiding interlayer separation, thereby ensuring the sealing performance of the battery during normal use and avoiding liquid leakage problems.

[0045] The following will be combined with Figure 2 to provide a detailed description of the battery provided by the embodiments of the present application.

[0046] As Figure 2 shown, the battery 200 in the embodiments of the present application includes a housing 210 and a sealing assembly 220.

[0047] The housing 210 includes a plurality of side walls, and the plurality of side walls can enclose a cavity for accommodating a battery module (or battery cells). A first through hole 212 communicating with the interior of the housing 210 (i.e., the cavity) is provided on a first side wall 211 among 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 has a thermal runaway, the high-temperature gas can be discharged through the first through hole 212.

[0048] In some embodiments, the first through hole 212 can also be a liquid injection hole, that is, during the battery manufacturing process, electrolyte can be injected into the interior of the housing 210 through the first through hole 212. After the liquid injection is completed, the sealing component 220 can be used to seal the first through hole 212. Of course, a liquid injection hole can also be additionally provided on the housing 210 for liquid injection. Relatively speaking, using the first through hole 212 as the liquid injection hole is more beneficial to the sealing performance of the battery and the compactness of the structure.

[0049] The embodiments of the present application do 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 any one of a circle, a square, a waist shape, an ellipse, a triangle, an irregular shape, a polygon, etc.

[0050] The sealing component 220 can also be called a pressure relief component. The sealing component 220 can include an adhesive layer 221 and a first sealing member 222. Under normal circumstances, the first sealing member 222 seals the first through hole 212 through the adhesive layer 221. In the case where pressure relief is required, the adhesive layer 221 will be melted by the hot gas, causing the first sealing member 222 to separate, and the hot gas can be discharged from the first through hole 212.

[0051] The first sealing member 222 can also be called a cover plate or a cover disk. Combining Figure 2 and Figure 3 As shown, the first sealing member 222 includes a first sealing member body 2221 and a first protrusion 223. The side of the first sealing member body 2221 facing the first side wall 211 is a first surface 2222, and the first surface 2222 is provided with the first protrusion 223. The first protrusion 223 can be located in the central area of the first sealing member 222. In some embodiments, the first protrusion 223 can extend into the first through hole 212.

[0052] The present application does not specifically limit the shape of the first protrusion 223, and the first protrusion 223 can be any shape that can extend from the first surface 2222 to the first through hole 212. For example, the shape of the first protrusion 223 is one of the following: a spike shape, a cylinder, a cone, or a cuboid. In some embodiments, the shape of the outer peripheral edge of the first protrusion 223 can be the same as the shape of the first through hole 212.

[0053] The adhesive layer 221 is used to bond the first sealing member 222 to the first through hole 212 to block the first through hole 212. The adhesive layer 221 can have strong adhesive force during normal use of the battery. 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. For details, see Figure 3 , the adhesive layer 221 may include an adhesive layer body 224 and a second protrusion 225.

[0054] The adhesive layer body 224 is located between the first sealing member body 2221 and the first side wall 211. The adhesive layer body 224 includes a first bonding surface 2241 and a second bonding surface 2242. The first bonding surface 2241 is the side surface of the adhesive layer body 224 facing the first sealing member 222, and the first bonding surface 2241 is used to bond to the first sealing member body 2221. The second bonding surface 2242 is the side surface of the adhesive layer body 224 facing the first side wall 211, and the second bonding surface 2242 is used to bond to the first side wall 211 or the second sealing member 227 described later.

[0055] The second protrusion 225 bends and extends from the end of the adhesive layer body 224 (the second bonding surface 2242) towards the inside of the housing 210. As Figure 4 shown, the inner wall 2251 of the second protrusion 225 fits with the outer wall 2231 of the first protrusion 223, and this fit can enable the outer wall 2231 of the first protrusion 223 of the first sealing member 222 to form an extrusion force on the inner wall 2251 of the second protrusion 225 of the adhesive layer 221.

[0056] In the embodiment of the present application, the first protrusion 223 on the first sealing member 222 can generate an extrusion force on the second protrusion 225 on the adhesive layer 221. Therefore, the sealing assembly 220 can not only seal the first through hole 212 through the adhesive force between the adhesive layer 221 and the first sealing member 222, but also seal the first through hole 212 through the extrusion force of the first protrusion 223 on the second protrusion 225, avoiding the delamination caused by the continuous destruction of the adhesive performance of the adhesive layer 221 by the electrolyte or hydrofluoric acid in the battery cell, improving the sealing reliability of the battery during normal use, and avoiding the problem of liquid leakage.

[0057] In some embodiments, the outer wall 2231 of the first protrusion 223 and the hole wall of the first through hole 212 can jointly form an extrusion force on the second protrusion 225. The outer wall 2231 of the first protrusion 223 forms an extrusion force from the inside to the outside on the inner wall 2251 of the second protrusion 225, and the hole wall of the first through hole 212 forms an extrusion force from the outside to the inside on the outer wall 2252 of the second protrusion 225. As a possible implementation manner, the first protrusion 223 can pass through the first through hole 212 and extend into the interior of the housing 210.

[0058] In other embodiments, asFigure 3 As shown, the sealing component 220 further includes a second sealing member 227, which can also be referred to as a sealing base or a sealing seat. The second sealing member 227 is located between the adhesive layer 221 and the first side wall 211. The second sealing member 227 has a third through hole 228 communicating with the first through hole 212. As Figure 4 shown, the outer wall 2252 of the second protrusion 225 is in contact with the inner wall 2281 (or the hole wall) of the third through hole 228. The outer wall 2231 of the first protrusion 223 and the inner wall 2281 of the third through hole 228 can form a squeezing force on the second protrusion 225. The outer wall 2231 of the first protrusion 223 forms an outward squeezing force on the inner wall 2251 of the second protrusion 225, and the inner wall 2281 of the third through hole 228 forms an inward squeezing force on the outer wall 2252 of the second protrusion 225.

[0059] By simultaneously squeezing the inner wall 2251 and the outer wall 2252 of the second protrusion 225, the adhesive layer 221 and the object adhered to the adhesive layer 221 can be firmly fixed at the squeezing position, further avoiding the delamination caused by the continuous destruction of the bonding performance of the adhesive layer body by the electrolyte or hydrofluoric acid in the battery cell, and further enhancing the sealing reliability of the battery.

[0060] In the embodiments of the present application, the shape of the third through hole 228 is not specifically limited. For example, the shape of the third through hole 228 can be any one of a circular shape, a square shape, a waist shape, an oval shape, a triangular shape, an irregular shape, a polygonal shape, etc. As an implementation manner, the shape of the third through hole 228 can be the same as the shape of the outer peripheral edge of the second protrusion 225.

[0061] In the embodiments of the present application, the formation of the second protrusion 225 is not specifically limited. As long as the second protrusion 225 is a protrusion on the adhesive layer 221 and the inner wall 2251 of the second protrusion 225 can be squeezed by the outer wall 2231 of the first protrusion 223. As an implementation manner, the shape of the second protrusion 225 is the same as the shape of the first protrusion 223. For example, the shape of the second protrusion 225 is one of the following: a peak shape, a cylinder, a cone, or a cuboid.

[0062] In some embodiments, the second protrusion 225 can be formed by the first protrusion 223 during the process of realizing the adhesion between the first sealing member 222 and the first bonding surface 2241.

[0063] As an example, as Figure 5 shown, the adhesive layer 221 can have a second through hole 226, and the dimension D1 of the second through hole 226 in the second direction is smaller than the dimension D2 of the outer wall 2231 of the first protrusion 223 in the second direction. As Figure 5As shown, when the center of the first protrusion 223 coincides with the center of the second through hole 226 and the first protrusion 223 moves in the direction towards the first side wall 211 (or the first direction), the first protrusion 223 can push the periphery of the second through hole 226 to extend towards the inside of the housing 210, so that the periphery of the second through hole 226 can be extruded and formed into a second protrusion 225 as shown in Figure 3 .

[0064] It should be noted that, as shown in Figure 3 and Figure 5 , the first direction is the extending direction of the first protrusion 223, that is, the Z direction in Figure 3 and Figure 5 . The second direction is the direction perpendicular to the first direction, that is, the X direction and / or the Y direction in Figure 3 and Figure 5 .

[0065] Forming the second protrusion 225 through the second through hole 226 in the adhesive layer 221 can ensure that the outer wall of the first protrusion 223 has sufficient extrusion force on the inner wall of the second protrusion 225, thereby further improving the sealing reliability of the battery during normal use.

[0066] It should be noted that before the second protrusion 225 is formed, the adhesive layer 221 about to form the second protrusion 225 (that is, the adhesive layer after D2 - D1 in Figure 5 (that is, the adhesive layer defined by the dotted line part and D1)) and the adhesive layer body 224 on the adhesive layer 221 are flush plate - shaped. In other words, the adhesive layer 221 about to form the second protrusion 225 and the adhesive layer body 224 on the adhesive layer 221 together form a flat adhesive layer 221. It can be seen from this that the thickness of the adhesive layer 221 about to form the second protrusion 225 is the same as the thickness of the adhesive layer body 224 on the adhesive layer 221, and this thickness is the original thickness of the adhesive layer 221.

[0067] The present application embodiment does not make specific limitations on the shape of the second through hole 226. For example, the shape of the second through hole 226 can be any one of circular, square, waist - shaped, oval, triangular, irregular, polygonal, etc. As an implementation manner, the second through hole 226 can have the same shape as the outer peripheral edge of the first protrusion 223.

[0068] After the adhesive layer 221 about to form the second protrusion 225 (as shown in Figure 5 ) forms the second protrusion 225 (as shown in Figure 3 ), the present application embodiment does not make specific limitations on the thickness of the second protrusion 225 (that is, the distance between the inner wall 2251 and the outer wall 2252 of the second protrusion 225).

[0069] As an implementation, as Figure 4 shown, the thickness of the second protrusion 225 is less than or equal to the thickness of the adhesive layer body 224. Since the adhesive layer body 224 is basically not extruded or, although there is extrusion on the adhesive layer body 224, the deformation formed by the extrusion is negligible, the thickness of the adhesive layer body 224 is close to the original thickness of the above-mentioned adhesive layer 221. Setting the thickness of the second protrusion 225 to be less than or equal to the thickness of the adhesive layer body 224 indicates that the second protrusion 225 is indeed formed after the adhesive layer 221 that is about to form the second protrusion 225 is extruded.

[0070] When the thickness of the second protrusion 225 is equal to the thickness of the adhesive layer body 224, a zero gap is formed between the second protrusion 225 and the adhesives on its two sides (i.e., the first protrusion 223 and the hole wall of the first through hole 212 or the first protrusion 223 and the hole wall of the third through hole 228). When the thickness of the second protrusion 225 is less than the thickness of the adhesive layer body 224, a negative gap that is relatively a zero gap is formed between the second protrusion 225 and the adhesives on its two sides.

[0071] Preferably, the thickness of the second protrusion 225 is set to be less than the thickness of the adhesive layer body 224, so as to increase the extrusion force of the outer wall 2231 of the first protrusion 223 on the inner wall 2251 of the second protrusion 225, which is beneficial to the sealing reliability of the battery.

[0072] As a possible implementation, the thickness of the second protrusion 225 is greater than or equal to 20% of the thickness of the adhesive layer body 224 to ensure that the second protrusion 225 formed by extrusion retains the structural strength of the adhesive layer 221, thereby ensuring the stability of the fixation in the second direction.

[0073] In some embodiments, the extension length (or coverage length) of the second protrusion 225 may exceed the top edge of the first protrusion 223. As Figure 4 shown, the first protrusion 223 has a first edge 2232 away from the first sealing member body 2221, and the second protrusion 225 has a second edge 2253 away from the adhesive layer body 224. The distance between the first edge 2232 and the first surface 2222 of the first sealing member body 2221 facing the first side wall 211 in the first direction is the first distance h1, and the distance between the second edge and the first surface 2222 of the first sealing member body 2221 facing the first side wall 211 in the first direction is the second distance h2, and the first distance h1 is less than or equal to the second distance h2.

[0074] Through this setting, it can be ensured that the second protrusion 225 can completely separate the first sealing member 222 from the housing 210 or the second sealing member 227, avoiding short circuits.

[0075] In some embodiments, the ratio of the length (or height) of the second protrusion 225 to the dimension of the adhesive layer body 224 in the second direction is greater than or equal to 10%. The length of the second protrusion 225 is the second distance h2 described above. Through this setting, it can be ensured that the extruded adhesive layer (i.e., the second protrusion 225) has sufficient contact area with the pore wall of the first through hole 212 or the third through hole 228, further ensuring the sealing performance.

[0076] As described above, the second protrusion 225 can be formed by processing the adhesive layer 221 through the first protrusion 223. At this time, the dimension of the adhesive layer body 224 in the second direction can be understood as the initial length of the adhesive layer 221 before the second protrusion 225 is formed (i.e., Figure 5 the dimension of the outer peripheral edge of the adhesive layer 221 shown), and the length of the second protrusion 225 can be understood as the length of the extruded adhesive layer on the adhesive layer 221 after extrusion.

[0077] In some embodiments, the angle between the side wall (inner wall 2251 or outer wall 2252) of the second protrusion 225 and the first surface 2222 described above is greater than 0 degree and less than or equal to 90 degrees. That is to say, the side wall of the second protrusion 225 can be inclined or vertical relative to the horizontal plane. By setting the side wall of the extruded second protrusion 225 to be inclined or vertical, the first protrusion 223 can simultaneously generate extrusion forces in the vertical and horizontal directions on the second protrusion 225, further strengthening the fixing performance of the extrusion and ensuring the sealing reliability of the battery.

[0078] As described above, the outer wall 2231 of the first protrusion 223 is in contact with the pore wall of the first through hole 212 on the first side wall 211 or the inner wall 2281 of the third through hole 228 on the second sealing member 227. In some embodiments, the height of the first protrusion 223 is greater than or equal to the sum of the thickness of the adhesive layer body 224 and the first dimension. The first dimension is equal to 1 / 10 of the thickness of the second sealing member 227 or the first side wall 211.

[0079] By setting the height (or length) of the first protrusion 223 as described above, it can be ensured that the first protrusion 223 can bend the adhesive layer, so as to realize the fitting and fixing of the second protrusion 225 formed by the first protrusion 223 and the first protrusion 223, that is, to realize the lateral (i.e., the second direction) fixing of the first protrusion 223 to the bent adhesive layer (and the second protrusion 225).

[0080] As a possible implementation, the first protrusion 223 may extend from the first surface 2222 of the first sealing member body 2221 to the inside of the third through hole 228. Even, the first protrusion 223 may extend from the first surface 2222 of the first sealing member body 2221 to pass through the third through hole 228. The first protrusion 223 and the third through hole 228 may be isolated by the adhesive layer 221, that is, the first protrusion 223 on the first sealing member 222 may pass through the second sealing member 227 covered with the adhesive layer.

[0081] This arrangement can further enable the first protrusion 223 to form a second protrusion 225 that isolates the first protrusion 223 and the third through hole 228 in the extension direction of the first protrusion 223, and the second protrusion 225 can be squeezed by the first protrusion 223 and the third through hole 228 at the same time, thereby effectively ensuring that the sealing assembly will not shift and will not separate when the battery is in normal use, further enhancing the battery sealing reliability.

[0082] In other embodiments, the second protrusion 225 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 224 and the second protrusion 225, and the size of the second protrusion 225 is set so that when the outer wall 2231 of the first protrusion 223 fits with the inner wall 2251 of the second protrusion 225, the outer wall 2231 of the first protrusion 223 can generate a squeezing force on the inner wall 2251 of the second protrusion 225.

[0083] In some embodiments, Figure 6 As shown, the first protrusion 223 has a through hole 229 extending along the height direction (or bending extension direction) of the first protrusion 223 and communicating with the second through hole, and the first sealing member 222 further includes a sealing sheet 230, which is arranged on a side of the first sealing member body 2221 away from the first side wall 211 and seals the through hole. The material of the sealing sheet 230 can be the same as or different from the material of the first sealing member 222.

[0084] In some embodiments, Figure 6 As shown, the first sealing member body 2221 has a sink 231 on one side away from the first side wall 211, and the sealing sheet 230 is arranged inside the sink 231. By arranging the sealing sheet 230 inside the sink 231, the sealing of the battery can be effectively ensured while also ensuring the aesthetics of the first sealing member 222.

[0085] In some embodiments, a plurality of protrusions are provided on the first sealing member body 2221, and the plurality of protrusions correspond to a plurality of adhesive layers and a plurality of through holes on the first side wall 211 or the second sealing member. For example, when the second sealing member and the negative electrode reinforcing sheet are integrated, there may be 2 through holes on the second sealing member, 2 first protrusion parts on the first sealing member 222, and 2 second protrusion parts on the adhesive layer body. The 2 first protrusion parts can hot-press the 2 second protrusion parts into the 2 through holes, further achieving fixation and ensuring the sealing performance of the battery.

[0086] The embodiments of the present application do not make specific limitations on the material of the housing 210.

[0087] In some examples, the material of the housing 210 is metal, and the material may include any one metal or an alloy made of multiple metals. For example, the material is one or more of copper, iron, aluminum, tin, lead, steel, and nickel.

[0088] As an implementation manner, the housing 210 may include a third substrate and a third nickel layer located on the surface of the third substrate. The third substrate may be metal. The third nickel layer has good electrolyte resistance. By setting the housing 210 as the third substrate and the third nickel layer located on the surface of the third substrate, not only can the electrolyte resistance performance of the housing 210 be improved, but also it can be better adapted to the adhesive layer, further improving the sealing performance of the battery.

[0089] In some other examples, the material of the housing 210 may be non-metal. For example, the material of the housing 210 may be plastic or rubber.

[0090] The embodiments of the present application do not make specific limitations on the material of the first sealing member 222, and the material of the first sealing member 222 may be the same as or different from the material of the housing 210.

[0091] In some embodiments, the material of the first sealing member 222 is metal, and the material may include any one metal or an alloy made of multiple metals. For example, the material is one or more of copper, iron, aluminum, tin, lead, steel, and nickel.

[0092] As an implementation manner, 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 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 thickness of the first nickel layer may be the same as or different from that of 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, not only can the electrolyte resistance performance of the first sealing member 222 be improved, but also it can be better adapted to the adhesive layer, further improving the sealing performance of the battery.

[0093] In the embodiments of the present application, no specific limitation is imposed on the material of the second sealing member 227, and the material of the second sealing member 227 may be the same as or different from the material of the housing 210.

[0094] In some embodiments, the material of the second sealing member 227 is metal, and the material may include any one metal or an alloy made of multiple metals. For example, the material is one or more of copper, iron, aluminum, tin, lead, steel, nickel.

[0095] As a implementation manner, the second sealing member 227 may include a second substrate and a second nickel layer located on the surface of the second substrate. The second substrate may be 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 thickness of the second nickel layer may be the same as or different from that of the first nickel layer. By configuring the second sealing member 227 as the second substrate and the second nickel layer located on the surface of the second substrate, not only can the electrolyte resistance performance of the second sealing member 227 be improved, but also better adaptation to the adhesive layer can be achieved, further improving the sealing performance of the battery.

[0096] In the embodiments of the present application, no specific limitation is imposed on the material of the adhesive layer 221. 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, polyether ether ketone, polyimide, polyamide, polyethylene glycol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, polyvinylidene fluoride, polyethylene naphthalate, polypropylene carbonate, poly(vinylidene fluoride - hexafluoropropylene), poly(vinylidene fluoride - co - chlorotrifluoroethylene), silicone, vinylon, polypropylene, acid anhydride modified polypropylene, polyethylene, ethylene and its copolymers, polyvinyl chloride, polystyrene, polyether nitrile, polyurethane, polyphenylene ether, polyester, polysulfone, amorphous alpha - olefin copolymer and its derivatives.

[0097] In the embodiments of the present application, no specific limitation is imposed on the structure of the adhesive layer 221. As a implementation manner, 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.

[0098] By setting the adhesive layer 221 to include a first adhesive layer and a second adhesive layer, extrusion can be formed on the first adhesive layer close to the housing to prevent electrolyte or hydrofluoric acid (HF) from entering the cross-section between the adhesive layer 221 and the first side wall (or the second sealing member 227); when activated by high temperature at the same time, the second adhesive layer will not melt or overflow excessively, and the second adhesive layer can form a better adhesive interface with the first sealing member, thereby preventing electrolyte or hydrofluoric acid (HF) from entering the adhesive interface between the adhesive layer 221 and the first sealing member.

[0099] In some embodiments, the adhesive layer 221 further includes a third adhesive layer, and the third adhesive layer is located between the second adhesive layer and the first 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.

[0100] In the embodiments of the present application, 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 is not specifically limited, as long as the above conditions are met. As a implementation manner, 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 satisfy 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.

[0101] In the embodiments of the present application, the shapes of the first sealing member 222 and the second sealing member 227 are not specifically limited. The first sealing member 222 may be a structure with a first protrusion and any one of the shapes such as circular, square, waist-shaped, oval, triangular, irregular, polygonal, etc. on its outer periphery. The second sealing member 227 may be a structure with a third through hole 228 and any one of the shapes such as circular, square, waist-shaped, oval, triangular, irregular, polygonal, etc. on its outer periphery. As a implementation manner, the shapes of the outer peripheral edges of the first sealing member 222 and the second sealing member 227 are the same.

[0102] The embodiments of the present application provide an electrical device using the battery described above as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. This electrical device may also be referred to as an electronic device.

[0103] It should be understood that in various embodiments of the present application, the magnitudes of the serial numbers of the above processes do not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0104] It should be noted that, in the above specific embodiments, the various elements described can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this application will not separately describe various possible combination methods. 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 cooperating flanges and chutes so that the piston can rotate relative to the piston body about the above axis.

[0105] 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 multiple separate components and / or parts. The disclosure of "a" or "an" used to describe a component or part is not intended to exclude other components or parts.

[0106] It should be understood that although terms such as "first" or "second" may be used in this 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.

[0107] As described above, the above are only the specific embodiments of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of changes or substitutions, which should all be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims described.

Claims

1. A battery, characterized in that, Comprising: A housing, including a first side wall, on which a first through hole communicating with the interior of the housing is provided; A sealing assembly, including an adhesive layer and a first sealing member, the first sealing member sealing the first through hole through the adhesive layer; The first sealing member includes a first sealing member body and a first protrusion, the first protrusion being provided on a side of the first sealing member body facing the first side wall; The adhesive layer includes an adhesive layer body and a second protrusion, the adhesive layer body being located between the first sealing member body and the first side wall, the second protrusion bending and extending from an end of the adhesive layer body toward the interior of the housing, and an inner wall of the second protrusion fitting with an outer wall of the first protrusion.

2. The battery according to claim 1, wherein, 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, and 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 a first direction is a first distance, and 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.

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 a 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 the first side wall, and the angle between a side wall of the second protrusion 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 thickness of the first side wall or the second sealing member.

8. The battery according to any one of claims 1 to 6, characterized in that, The first protrusion has a through hole extending along the height direction of the first protrusion and communicating with a second through hole, and the first sealing member further includes a sealing piece, the sealing piece being provided on a side of the first sealing member body away from the first side wall and sealing the through hole.

9. The battery according to claim 8, characterized in that, A sink is provided on a side of the first sealing member body away from the first side wall, and the sealing piece is provided inside the sink.

10. The battery according to any one of claims 1 to 6, characterized in that, The adhesive layer has a second through hole, and a periphery of the second through hole extends toward the interior of the housing to form the second protrusion.

11. The battery according to any one of claims 1 to 6, characterized in that, A plurality of protrusions are provided on the first sealing member body, and the plurality of protrusions correspond to a plurality of adhesive layers and a plurality of through holes on the first side wall.

12. The battery according to any one of claims 1 to 6, characterized in that, The adhesive 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 a side of the first adhesive layer facing away from the first side wall, and the melting point of the first adhesive layer is less than the melting point of the second adhesive layer.

13. The battery according to claim 12, wherein, The adhesive layer further includes a third adhesive layer, the third adhesive layer is located between the second adhesive layer and the first sealing member, and the melting point of the third adhesive layer is less than the melting point of the second adhesive layer.

14. The battery according to claim 13, 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, satisfying at least one of the following: 95°C ≤ T1 ≤ 135°C, and / or 140°C ≤ T2 ≤ 190°C, and / or 95℃≤T3≤135℃。 15. The battery according to any one of claims 1 to 6, characterized in that, The first sealing member includes a first base material and a first nickel layer located on the surface of the first base material.

16. The battery according to any one of claims 1 to 6, characterized in that, The sealing assembly further includes: A second sealing member, which is located between the adhesive layer and the first side wall. The second sealing member has a third through hole communicating with the first through hole, and the outer wall of the second protrusion is attached to the inner wall of the third through hole.

17. The battery according to claim 16, characterized in that, The second sealing member includes a second base material and a second nickel layer located on the surface of the second base material.

18. The battery according to claim 16, characterized in that, The first protrusion extends from the first sealing member body into the interior of the third through hole.

19. The battery according to claim 16, characterized in that, The first protrusion and the third through hole are isolated by the adhesive layer.

20. The battery according to any one of claims 1 to 6, characterized in that, The shape of the first protrusion is one of the following: spike-shaped, cylindrical, conical, or cuboid.

21. The battery according to any one of claims 1 to 6, characterized in that, The first protrusion passes through the first through hole and extends into the interior of the housing.

22. An electronic device, characterized in that, Comprising a battery according to any one of claims 1-21.

Images