Electrochemical device and electronic equipment

Abstract

The application provides an electrochemical device and an electronic device. The electrochemical device comprises a shell, a pole, a melt adhesive and a first buffer. The shell comprises a shell body and a cover plate which jointly define a receiving cavity. The cover plate has a first connecting surface and a first channel. The first connecting surface is located on one side of the cover plate. The pole comprises a body and an extension part connected to the body. The body is arranged in the first channel. The projection of the body is located in the projection of the extension part. The melt adhesive comprises a first connecting part and a second connecting part. The first connecting part is annular and surrounds the body. One side of the first connecting part is connected to the first connecting surface, and the other side is connected to the extension part. The second connecting part is connected to the first connecting part and located in the circumferential direction of the first connecting part. One side of the second connecting part is connected to the first connecting surface, and the other side is connected to the first buffer. The electronic device comprises the electrochemical device. The electrochemical device and the electronic device have stronger safety performance.

Description

Technical Field

[0001] This application relates to the field of electrochemical energy storage, specifically to electrochemical devices and electronic equipment. Background Technology

[0002] Steel-cased button cells protect the cells through a steel casing structure. In existing technologies, there is a gap between the cell and the cover plate in the steel casing structure. When the steel-cased button cell is subjected to an impact perpendicular to the cover plate, the cover plate is prone to deforming towards the gap, which in turn causes local compression of the cell, resulting in significant local stress on the cell. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes an electrochemical device with enhanced safety performance.

[0004] This application also proposes an electronic device having the above-described electrochemical device.

[0005] An electrochemical device according to a first aspect embodiment of this application includes: The housing includes a shell and a cover plate, the shell and the cover plate together defining a receiving cavity for receiving a battery cell and an electrolyte, the cover plate having a first connecting surface and a first channel, the first connecting surface being located on the side of the cover plate near the receiving cavity; An electrode post includes a body and an extension. The body passes through the first channel, and the extension is connected to the side of the body near the receiving cavity. The electrochemical device has a projection plane perpendicular to the extension direction of the first channel. The body has a first projection, and the extension has a second projection. The first projection is located within the second projection. The molten adhesive includes a first connecting portion and a second connecting portion. The first connecting portion has an annular structure and surrounds the body. The first connecting portion is connected to the first connecting surface on one side in the first channel extension direction and to the extension portion on the other side. The second connecting portion is connected to the first connecting portion and is located circumferentially to the first connecting portion. The first buffer member, and the second connecting part is connected to the first connecting surface on one side in the extension direction of the first channel, and connected to the first buffer member on the other side.

[0006] The electrochemical device according to the embodiments of this application has at least the following beneficial effects: the extension is connected to the housing through the first connecting portion, thereby sealing the first channel and preventing the electrolyte in the receiving cavity from flowing out of the receiving cavity through the first channel, providing a stable electrochemical environment for the electrochemical reaction of the battery cell. The positive and negative electrodes of the battery cell can be connected to the housing and the electrode post respectively to transmit electrical energy outward. The second connecting portion connected to the first connecting portion and the first connecting surface can further enhance the connection stability of the first connecting portion and improve the safety of the electrochemical device. Since a first buffer is connected to one side of the second connecting portion in the extension direction of the first channel, the first buffer can utilize the space of the extension portion perpendicular to the extension direction of the first channel, and at the same time utilize the space of the second connecting portion in the extension direction of the first channel to provide a buffering effect for the electrochemical device, further improving the safety of the electrochemical device.

[0007] According to some embodiments of this application, the electrochemical device further includes a second buffer element connected to the first connection surface; In a direction perpendicular to the extension direction of the first channel, the second buffer is located between the housing and the second connecting portion.

[0008] According to some embodiments of this application, the second buffer is integrally connected to the first buffer.

[0009] According to some embodiments of this application, the second buffer is a ring structure and surrounds the body.

[0010] According to some embodiments of this application, the electrochemical device further includes a corrosion-resistant component bonded to the side of the first buffer member near the receiving cavity in the first channel extension direction.

[0011] According to some embodiments of this application, the corrosion-resistant component is also bonded to the side of the extension near the receiving cavity in the first channel extension direction.

[0012] According to some embodiments of this application, the corrosion-resistant component has a first mounting surface on the side away from the receiving cavity in the first channel extension direction, the first buffer component has a second mounting surface on the side near the receiving cavity in the first channel extension direction, and the extension has a third mounting surface on the side near the receiving cavity in the first channel extension direction; the first mounting surface is bonded to the second mounting surface and part of the third mounting surface, and the second mounting surface and the third mounting surface are coplanar.

[0013] According to some embodiments of this application, along the extension direction of the first channel, the size of the first buffer is less than or equal to the size of the extension.

[0014] According to some embodiments of this application, the first buffer is made of fluorosilicone rubber or polyimide foam.

[0015] An electronic device according to a second aspect of this application includes an electrochemical device as described in any of the above embodiments.

[0016] The electronic device according to the embodiments of this application has at least the following beneficial effects: The second connecting portion, connected to the first connecting surface, further enhances the overall strength of the molten adhesive through its connection with the first connecting portion, thereby improving the connection stability between the extension and the cover plate. Since a first buffer is connected to the second connecting portion on one side of the first channel extension direction, the first buffer can utilize the space perpendicular to the first channel extension direction of the extension portion, and simultaneously utilize the space of the second connecting portion in the first channel extension direction to provide a buffering effect for the electrochemical device, further improving the safety of the electrochemical device and enhancing the safety of the electronic equipment.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is an overall schematic diagram of an electrochemical device according to some embodiments of the first aspect of this application; Figure 2 for Figure 1 A top-view schematic diagram of the electrochemical unit; Figure 3 for Figure 2 A cross-sectional schematic diagram of the electrochemical device shown in Figure AA; Figure 4 for Figure 3 The enlarged view shown at point B in the middle; Figure 5 for Figure 3 A magnified view of the area shown at point C.

[0019] Figure label: Electrochemical device 10; Outer shell 100, housing 110, cover plate 120, first connecting surface 121, first channel 122, receiving cavity 130; pole post 200, body 210, extension 220, third mounting surface 221; 300 molten adhesive, 310 first connecting part, 320 second connecting part; First buffer component 400, second mounting surface 410; Second buffer 500; Corrosion-resistant component 600, first mounting surface 610, through hole 620; 700 battery cells. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. The embodiments of this application may omit unnecessary detailed descriptions. For example, detailed descriptions of well-known matters and repeated descriptions of actually identical structures may be omitted. This is to avoid making the following description unnecessarily lengthy and to facilitate understanding by those skilled in the art.

[0021] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0022] As used herein, the terms “approximately,” “generally,” “substantially,” and “about” are used to describe and indicate small variations. When used in conjunction with an event or situation, the terms may refer to examples in which the event or situation occurred precisely and examples in which the event or situation occurred very approximately. For example, when used in conjunction with numerical values, the terms may refer to a range of variation less than or equal to ±10% of the numerical value, such as less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%. For example, if the difference between two values ​​is less than or equal to ±10% of the average of the values ​​(e.g., less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%), then the two values ​​can be considered "substantially" the same.

[0023] Furthermore, for ease of description, "first," "second," "third," etc., can be used in this article to distinguish different components of a figure or a series of figures. "First," "second," "third," etc., are not intended to describe the corresponding components.

[0024] Additionally, quantities, ratios, and other numerical values ​​are sometimes presented in range format in this document. It should be understood that such range format is for convenience and brevity and should be interpreted flexibly to include not only the numerical values ​​explicitly specified as range limits, but also all individual numerical values ​​or subranges covered within the range, as if each numerical value and subrange were explicitly specified.

[0025] In the detailed description and claims, a list of items connected by the terms "one of," "among," "a kind of," or other similar terms may mean any of the listed items. For example, if items A and B are listed, then the phrase "one of A and B" means only A or only B. In another example, if items A, B, and C are listed, then the phrase "one of A, B, and C" means only A; only B; or only C. Item A may contain a single element or multiple elements. Item B may contain a single element or multiple elements. Item C may contain a single element or multiple elements. In the detailed description and claims, a list of items connected by the term "at least one of" may mean any combination of the listed items. For example, if items A and B are listed, then the phrase "at least one of A and B" means only A; only B; or A and B. In another instance, if items A, B, and C are listed, then the phrase "at least one of A, B, and C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C.

[0026] In the following description, all figures disclosed in this application are approximate values, regardless of whether the terms "about" or "approximately" are used in conjunction. They may vary by 1%, 2%, 5%, or sometimes 10% to 20%. Whenever a range of values ​​with a lower limit (RL) and an upper limit (RU) is disclosed, any values ​​falling within that range are specifically disclosed. Specifically, the following values ​​within this range are specifically disclosed: R = RL + k * (RU - RL), where k is a variable ranging from 1% to 100% with a 1% increment, i.e., k is 1%, 2%, 3%, 4%, 5%, ..., 50%, 51%, 52%, ..., 95%, 96%, 97%, 98%, 99%, or 100%. Furthermore, any range of values ​​defined by the two R values ​​as defined above are also specifically disclosed.

[0027] Throughout this specification, references to "implementation," "partial implementation," "one implementation," "another implementation," "specific method," or "partial method" mean that at least one implementation or embodiment in this application includes the specific features, structures, materials, or characteristics described in that implementation or embodiment.

[0028] In this application, numerical ranges are involved. Unless otherwise specified, the numerical ranges mentioned above are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Any lower limit can be combined with any upper limit to form a range not explicitly stated; and any lower limit can be combined with other lower limits to form a range not explicitly stated, just as any upper limit can be combined with any other upper limit to form a range not explicitly stated. Furthermore, each individually disclosed point or single value can itself serve as a lower or upper limit and be combined with any other point or single value or with other lower or upper limits to form a range not explicitly stated.

[0029] Please refer to Figures 1 to 5 As shown, this application proposes an electrochemical device 10, including a housing 100, an electrode 200, a molten adhesive 300, and a first buffer 400.

[0030] Please refer to Figure 1 , Figure 4 As shown, the housing 100 includes a housing 110 and a cover plate 120. The housing 110 is connected to the cover plate 120 and together with the cover plate 120 defines a receiving cavity 130. The receiving cavity 130 is used to receive the battery cell 700 and the electrolyte. The cover plate 120 has a first connecting surface 121 and a first channel 122. The first connecting surface 121 is located on the side of the cover plate 120 near the receiving cavity 130.

[0031] Please refer to Figure 3 , Figure 4 , Figure 5 As shown, the electrode post 200 includes a body 210 and an extension 220. The body 210 passes through the first channel 122, and the extension 220 is connected to the side of the body 210 near the receiving cavity 130. The electrochemical device 10 has an extension direction perpendicular to the first channel 122 (the extension direction of the first channel 122 is also...). Figure 3 The projection plane (vertical direction) of the first channel 210 has a first projection, and the extension 220 has a second projection. The first projection is located within the second projection. The molten adhesive 300 includes a first connecting portion 310 and a second connecting portion 320. The first connecting portion 310 has an annular structure and surrounds the body 210. The first connecting portion 310 is connected to the first connecting surface 121 on one side in the extension direction of the first channel 122 and connected to the extension 220 on the other side. The second connecting portion 320 is connected to the first connecting portion 310 and is located circumferentially to the first connecting portion 310.

[0032] With the above solution, since the extension 220 of the pole post 200 is connected to the side of the body 210 near the receiving cavity 130, and the first projection is located in the second projection, the extension 220 protrudes relative to the body 210 in a direction perpendicular to the extension direction of the first channel 122. The extension 220 is connected to the cover plate 120 through the first connecting part 310 of the molten adhesive 300 on the side of the extension direction of the first channel 122 away from the receiving cavity 130, thus separating the first channel 122 and the receiving cavity 130.

[0033] This application forms a closed containment cavity 130 for accommodating the battery cell 700 and electrolyte by means of a housing 110, a cover plate 120, an electrode post 200 and a molten adhesive 300, providing a stable electrochemical environment for the battery cell 700 contained in the containment cavity 130. The positive and negative electrodes of the battery cell 700 can be connected to the housing 110 and the electrode post 200 respectively to transmit electrical energy to the outside.

[0034] Please refer to Figure 4 As shown, the electrochemical device 10 of this application further includes a first buffer 400, and a second connecting portion 320 connected to the first connecting surface 121 on one side of the first channel 122 extending direction, and connected to the first buffer 400 on the other side. The second connecting portion 320 connected to the first connecting surface 121, through its connection with the first connecting portion 310, can further enhance the overall strength of the molten adhesive 300, thereby improving the connection stability between the extension portion 220 and the cover plate 120. Since the first buffer 400 is connected to the second connecting portion 320 on one side of the first channel 122 extending direction, the first buffer 400 can utilize the space of the extension portion 220 perpendicular to the first channel 122 extending direction, and simultaneously utilize the space of the second connecting portion 320 in the first channel 122 extending direction, to provide a buffering effect for the electrochemical device 10, further improving the safety of the electrochemical device 10.

[0035] Without departing from the inventive concept of this application, those skilled in the art can choose the material for the first buffer 400. As a preferred embodiment, in some embodiments, the first buffer 400 is made of fluorosilicone rubber or polyimide foam. Fluorosilicone rubber and polyimide foam have good elasticity and can absorb more impact force.

[0036] Without departing from the inventive concept of this application, the molten adhesive 300 is an insulating material. The extension 220 is connected to the cover plate 120 via the molten adhesive 300, thereby avoiding direct contact between the electrode post 200 and the outer casing 100, achieving insulation between the electrode post 200 and the outer casing 100, and simultaneously fixing the electrode post 200 to the outer casing 100. As a preferred embodiment, the molten adhesive 300 is composed of one of the following materials: epoxy resin, polyurethane, silicone, or acrylic resin. The above materials have higher bonding strength, which can better fix the electrode post 200 to the cover plate 120 and enhance the overall strength of the electrochemical device 10.

[0037] Without departing from the inventive concept of this application, those skilled in the art can determine the specifications of the first buffer 400 according to the space of the receiving cavity 130. As a preferred embodiment, please refer to... Figure 4 As shown, in some embodiments, the size of the first buffer 400 along the extension direction of the first channel 122 is less than or equal to the size of the extension 220. Through this solution, the first buffer 400 can avoid increasing the size of the electrochemical device 10 along the extension direction of the first channel 122, thus ensuring the energy density of the electrochemical device 10.

[0038] Without departing from the inventive concept of this application, those skilled in the art can make further improvements to the structure of the electrochemical device 10.

[0039] As a preferred option, please refer to Figure 4 , Figure 5 As shown, in some embodiments, the electrochemical device 10 further includes a corrosion-resistant component 600, which is bonded to the first buffer component 400 on the side near the receiving cavity 130 in the extending direction of the first channel 122. The corrosion-resistant component 600 bonded to the first buffer component 400 on the side near the receiving cavity 130 in the extending direction of the first channel 122 can further reduce the direct contact between the electrolyte and the first buffer component 400 when electrolyte is disposed within the receiving cavity 130, thereby extending the service life of the first buffer component 400 and improving the overall durability of the electrochemical device 10. On the other hand, the corrosion-resistant component 600 can also further reduce the direct contact between the electrolyte and the molten adhesive 300, thereby slowing down the corrosion process of the electrolyte on the molten adhesive 300 and extending the service life of the electrochemical device 10.

[0040] Further, please refer to Figure 5 As shown, in some embodiments, the corrosion-resistant component 600 is also bonded to the extension 220 on the side of the first channel 122 near the receiving cavity 130 in the extending direction of the first channel 122. Through this solution, the corrosion-resistant component 600, by bonding to the extension 220, can be more securely held on the side of the first buffer component 400 near the receiving cavity 130 in the extending direction of the first channel 122, thereby enabling the corrosion-resistant component 600 to continuously and stably reduce direct contact between the electrode liquid and the first buffer component 400, extending the service life of the first buffer component 400.

[0041] Further, please refer to Figure 4 , Figure 5As shown, in some embodiments, the corrosion-resistant component 600 has a first mounting surface 610 on the side away from the receiving cavity 130 in the extending direction of the first channel 122; the first buffer component 400 has a second mounting surface 410 on the side near the receiving cavity 130 in the extending direction of the first channel 122; and the extension 220 has a third mounting surface 221 on the side near the receiving cavity 130 in the extending direction of the first channel 122. The first mounting surface 610 is bonded to the second mounting surface 410 and part of the third mounting surface 221, and the second mounting surface 410 and the third mounting surface 221 are coplanar. With this solution, since the second mounting surface 410 and the third mounting surface 221 are coplanar, when attaching the corrosion-resistant component 600 of this embodiment, the worker can directly attach the corrosion-resistant component 600 to the extension 220 and the first buffer component 400 by pressing, making the installation process of the corrosion-resistant component 600 simpler and improving production efficiency.

[0042] It should be noted that those skilled in the art can easily create notches of different shapes on the corrosion-resistant part 600, allowing the battery cell 700 within the receiving cavity 130 to be electrically connected to the body 210 through the notches. For example, please refer to... Figure 5 As shown, in some embodiments, the corrosion-resistant component 600 has a through hole 620.

[0043] Please refer to Figure 4 As shown, in some embodiments, the electrochemical device 10 further includes a second buffer 500, which is connected to the first connecting surface 121. The second buffer 500 is located between the housing 110 and the second connecting portion 320 in a direction perpendicular to the extending direction of the first channel 122. Through this design, the second buffer 500 can utilize the space between the housing 110 and the second connecting portion 320 to provide a buffering effect for the electrochemical device 10, further improving the safety of the electrochemical device 10.

[0044] Furthermore, in some embodiments, the second buffer 500 is integrally connected to the first buffer 400. Through the above scheme, the second buffer 500 and the first buffer 400 are of an integral structure, allowing workers to simultaneously install the first buffer 400 and the second buffer 500 during the production of the electrochemical device 10 in the above embodiments, thereby improving production efficiency.

[0045] Furthermore, in some embodiments, the second buffer 500 is a ring structure and surrounds the body 210. Through the above design, the second buffer 500 can further utilize the radial space of the body 210, resulting in stronger buffering capacity and improving the safety of the electrochemical device 10.

[0046] On the other hand, by combining the second buffer 500 integrally connected to the first buffer 400, the integrally connected first buffer 400 and second buffer 500 can jointly define a groove for accommodating the second connecting part 320. Thus, the integrally connected first buffer 400 and second buffer 500 can be installed and positioned through the cooperation between the groove and the second connecting part 320, which is beneficial to improving production efficiency.

[0047] To help those skilled in the art understand the specific technical effects of setting the second buffer 500, the following comparative test further illustrates the point.

[0048] Example 1: The second buffer 500 has an annular structure and is integrally connected with the first buffer part. The inner wall surface of the housing 110 is a cylindrical surface, and the axis of the inner wall surface of the housing 110 coincides with the axis of the second buffer 500. The dimension of the second buffer part along the extension direction of the first channel 122 is 0.3mm, the difference between its inner and outer diameters is 1.5mm, and the difference between the outer diameter of the second buffer part and the cylindrical surface is 1.0mm.

[0049] Please refer to Figure 1 As shown, the electrochemical device 10, including the second buffer 500 mentioned above, is placed on a plane and fixed by a horizontal clamp to prevent horizontal displacement of the electrochemical device 10. The test temperature is controlled between 23 and 25 degrees Celsius. A steel column with a diameter of 15.8 ± 0.1 mm is placed against the side of the cover plate 120 away from the receiving cavity 130, and the axis of the steel column is aligned with the axis of the first channel 122.

[0050] Then, a 9.1±0.46 kg weight was dropped freely from a height of 610±25 mm onto the steel column. After the test, the state of the electrochemical device 10 was observed and recorded. A total of ten electrochemical devices 10 were selected for testing. Electrochemical devices 10 that did not ignite or explode were recorded as qualified, and the pass rate was calculated.

[0051] Example 2: The difference from Embodiment 1 is that the dimension H of the second buffer part along the extension direction of the first channel 122 is 0.3 mm, the dimension difference D1 between the inner and outer diameters is 2.5 mm, and the dimension difference D2 between the outer diameter of the second buffer part and the cylindrical surface is 0 mm.

[0052] Example 3: The difference from Embodiment 1 is that the dimension H of the second buffer part along the extension direction of the first channel 122 is 0.3 mm, the dimension difference D1 between the inner and outer diameters is 2.0 mm, and the dimension difference D2 between the outer diameter of the second buffer part and the cylindrical surface is 0.5 mm.

[0053] Example 4: The difference from Embodiment 1 is that the dimension H of the second buffer part along the extension direction of the first channel 122 is 0.2 mm, the dimension difference D1 between the inner and outer diameters is 0.5 mm, and the dimension difference D2 between the outer diameter of the second buffer part and the cylindrical surface is 2.0 mm.

[0054] Example 5: The difference from Embodiment 1 is that the dimension H of the second buffer part along the extension direction of the first channel 122 is 0.2 mm, the dimension difference D1 between the inner and outer diameters is 1.5 mm, and the dimension difference D2 between the outer diameter of the second buffer part and the cylindrical surface is 1.0 mm.

[0055] Example 6: The difference from Embodiment 1 is that the dimension H of the second buffer part along the extension direction of the first channel 122 is 0.2 mm, the dimension difference D1 between the inner and outer diameters is 2.0 mm, and the dimension difference D2 between the outer diameter of the second buffer part and the cylindrical surface is 0.5 mm.

[0056] Example 7: The difference from Embodiment 1 is that the dimension H of the second buffer part along the extension direction of the first channel 122 is 0.1 mm, the dimension difference D1 between the inner and outer diameters is 1.5 mm, and the dimension difference D2 between the outer diameter of the second buffer part and the cylindrical surface is 1.0 mm.

[0057] Example 8: The difference from Embodiment 1 is that the dimension H of the second buffer part along the extension direction of the first channel 122 is 0.1 mm, the dimension difference D1 between the inner and outer diameters is 2.0 mm, and the dimension difference D2 between the outer diameter of the second buffer part and the cylindrical surface is 0.5 mm.

[0058] Comparative example: The difference from Example 1 is that the electrochemical device 10 does not have a second buffer section. That is, the dimension H of the second buffer section along the extension direction of the first channel 122 is 0 mm, the dimension difference D1 between the inner and outer diameters is 0 mm, and the dimension difference D2 between the outer diameter of the second buffer section and the cylindrical surface is 0 mm.

[0059] Table 1 Test results of various embodiments and comparative examples of this application

[0060] According to Table 1, the pass rate of the electrochemical device 10 in the comparative example is only 80%. The embodiment that satisfies the following conditions has a second buffer section with a dimension H greater than 0.2 mm along the extension direction of the first channel 122, a difference D1 between the inner and outer diameters greater than 1.5 mm, and a difference D2 between the outer diameter of the second buffer section and the cylindrical surface less than 1.0 mm, has a better buffering effect than the comparative example.

[0061] Please refer to Figures 1 to 5 As shown, this application also proposes an electronic device, which includes an electrochemical device 10 as described in any of the above embodiments.

[0062] Through the above scheme, the second connecting part 320 connected to the first connecting surface 121, through its connection with the first connecting part 310, can further enhance the overall strength of the molten adhesive 300, thereby improving the connection stability between the extension part 220 and the cover plate 120. Since the second connecting part 320 is connected to a first buffer member 400 on one side of the first channel 122's extension direction, the first buffer member 400 can utilize the space of the extension part 220 perpendicular to the first channel 122's extension direction, and simultaneously utilize the space of the second connecting part 320 in the first channel 122's extension direction to provide a buffering effect for the electrochemical device 10, further improving the safety of the electrochemical device 10 and enhancing the safety of the electronic device.

[0063] It should be understood that the electronic device described in this application is not particularly limited and can be any electronic device known in the prior art. The electrochemical device 10 of this invention is not particularly limited in its use and can be used in any electronic device known in the prior art. According to some embodiments of the invention, the electronic devices include, but are not limited to, mobile phones, smartphones, laptops, tablets, wearable devices, smartwatches, smart bracelets, smart glasses, power banks, televisions, game consoles, game controllers, digital cameras, smart speakers, headphones, keyboards, mice, monitors, drones, audio equipment, home appliances, toys, power tools, automobiles, motorcycles, electric bicycles, bicycles, robots, robot dogs, industrial robots, android robots, etc.

[0064] Although illustrative embodiments have been demonstrated and described, those skilled in the art should understand that the above embodiments should not be construed as limiting the invention, and that changes, substitutions and modifications can be made to the embodiments without departing from the spirit, principles and scope of the invention.

[0065] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. An electrochemical device, characterized in that, include: The housing includes a shell and a cover plate, the shell and the cover plate together defining a receiving cavity for receiving a battery cell and an electrolyte, the cover plate having a first connecting surface and a first channel, the first connecting surface being located on the side of the cover plate near the receiving cavity; An electrode post includes a body and an extension. The body passes through the first channel, and the extension is connected to the side of the body near the receiving cavity. The electrochemical device has a projection plane perpendicular to the extension direction of the first channel. The body has a first projection, and the extension has a second projection. The first projection is located within the second projection. The molten adhesive includes a first connecting portion and a second connecting portion. The first connecting portion has an annular structure and surrounds the body. The first connecting portion is connected to the first connecting surface on one side in the first channel extension direction and to the extension portion on the other side. The second connecting portion is connected to the first connecting portion and is located circumferentially to the first connecting portion. The first buffer member, and the second connecting part is connected to the first connecting surface on one side in the extension direction of the first channel, and connected to the first buffer member on the other side.

2. The electrochemical device according to claim 1, characterized in that, The electrochemical device further includes a second buffer, which is connected to the first connection surface; In a direction perpendicular to the extension direction of the first channel, the second buffer is located between the housing and the second connecting portion.

3. The electrochemical device according to claim 2, characterized in that, The second buffer is integrally connected to the first buffer.

4. The electrochemical device according to claim 2 or 3, characterized in that, The second buffer is a ring structure and surrounds the body.

5. The electrochemical device according to claim 1, characterized in that, The electrochemical device further includes a corrosion-resistant component, which is bonded to the first buffer on the side of the first channel extending in the direction close to the receiving cavity.

6. The electrochemical device according to claim 5, characterized in that, The corrosion-resistant component is also bonded to the extension on the side of the receiving cavity in the first channel extension direction.

7. The electrochemical device according to claim 6, characterized in that, The corrosion-resistant component has a first mounting surface on the side away from the receiving cavity in the first channel extension direction, the first buffer component has a second mounting surface on the side near the receiving cavity in the first channel extension direction, and the extension has a third mounting surface on the side near the receiving cavity in the first channel extension direction; the first mounting surface is bonded to the second mounting surface and part of the third mounting surface, and the second mounting surface and the third mounting surface are coplanar.

8. The electrochemical device according to claim 1, characterized in that, Along the extension direction of the first channel, the size of the first buffer is less than or equal to the size of the extension.

9. The electrochemical device according to claim 1, characterized in that, The first buffer is made of fluorosilicone rubber or polyimide foam.

10. An electronic device, characterized in that, Includes the electrochemical device as described in any one of claims 1 to 9.

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