Housing for lithium-ion battery, lithium-ion battery, and electronic device including same

Abstract

The utility model discloses a kind of shell of lithium ion battery, lithium ion battery and electronic equipment comprising it, the shell of this lithium ion battery includes top cover assembly and the shell for accommodating electric core, top cover assembly cover is located at the open end of shell, the inner wall of shell is constructed with accommodating area, accommodating area is set along the height direction of shell, accommodating area is sequentially provided with insulating layer and baffle from inside to outside, baffle is used for abutting the pole lug of electric core side, the gap between baffle and the side wall of accommodating area is sealed by sealing adhesive paper. By constructing accommodating area in the inner wall of shell, insulating layer and baffle are sequentially stacked in accommodating area, so that baffle is effectively insulated and isolated with shell and accommodating area by insulating layer, even if different polarity pole lug and baffle contact when baffle abuts to the pole lug of electric core side, short circuit does not occur, without large-area glue-packing insulation treatment on electric core side, solve the problem that glue-packing insulation occupies too much side space, causes the size of pole piece to reduce.

Description

Technical Field

[0001] This application relates to the field of electrochemical energy storage technology, and in particular to a lithium-ion battery casing, a lithium-ion battery, and an electronic device including the same. Background Technology

[0002] Lithium-ion batteries are widely used as important energy storage devices. Stacked coin cell batteries, a common type of lithium-ion battery, typically consist of a cell, a casing, and tabs. The cell is formed by stacking positive and negative electrodes and a separator using a lamination process, and then encapsulated within a metal casing. In existing stacked coin cell structures, to achieve parallel connection of multiple tabs to reduce internal resistance and improve battery performance, a multi-tab structure design is usually adopted. The tabs extend from the side of the bare cell and are then electrically connected to the positive and negative terminals of the casing via an adapter structure.

[0003] In the above structure, since the tabs extend from the side of the bare cell, there are exposed areas of different polarities between the tabs and the cell side. To prevent short circuits between the positive and negative electrodes, the tabs need to be connected by soldering, and the cell side needs to be fully insulated with adhesive. Specifically, multiple tabs are connected to the casing terminals by soldering, and insulating adhesive is used to encapsulate the tab area on the cell side to isolate conductive components of different polarities and ensure battery safety.

[0004] However, the above technical solutions have the following drawbacks. On the one hand, the insulating adhesive is constantly immersed in the electrolyte during battery use, which can easily lead to swelling, aging, or peeling, resulting in a decrease in insulation performance. This increases the risk of short circuits between the positive and negative electrodes, affecting the safety and lifespan of the battery. On the other hand, in order to accommodate multiple tabs and leave sufficient insulating coating area in the limited space on the side of the battery cell, it is often necessary to reduce the size of the electrode sheets. This directly leads to a decrease in the energy density (ED) of the battery, which cannot meet the application requirements of high-energy-density batteries. Utility Model Content

[0005] The main objective of this application is to provide a casing for a lithium-ion battery that aims to improve the safety and energy density of the lithium-ion battery.

[0006] To achieve the above objectives, this application proposes a casing for a lithium-ion battery. The casing includes a top cover assembly and a housing for accommodating a battery cell. The top cover assembly covers the opening of the housing. The inner wall of the housing has a receiving area that extends along the height direction of the housing. An insulating layer and a separator are sequentially arranged in the receiving area from the inside to the outside. The separator is used to abut against the tabs on the side of the battery cell. The gap between the separator and the side wall of the receiving area is sealed with sealant.

[0007] In some embodiments, the width of the partition is W1 and the height is H1; the width of the accommodating area is W2 and the height is H2, and they satisfy the following relationship: W1 < W2; H1 < H2.

[0008] In some embodiments, the insulating layer has a height of H3 and a width of W3, and satisfies the following relationship: H3≤H2; W3≤W2.

[0009] In some embodiments, one end of the partition extends along the height direction of the housing and abuts against the side of the top cover assembly facing the opening end of the housing.

[0010] In some embodiments, the thickness of the insulating layer is T1, the thickness of the partition is T2, and the depth of the accommodating region is T3, and satisfies: T1+T2≥T3.

[0011] In some embodiments, the top cover assembly includes: A cover plate, wherein a pole hole is formed in the middle of the cover plate; The pole has a connected column and a base, the column being disposed within the pole hole, the base being exposed on the side of the cover plate facing the opening end of the housing, the outer wall of the base being constructed with a strip-shaped extension, the strip-shaped extension extending radially along the cover plate and abutting against the partition plate.

[0012] In some embodiments, an insulating pad is provided between the base, the strip extension, and the cover plate.

[0013] In some embodiments, the side of the cover plate facing the opening end of the housing is provided with a guide groove, and the base and the strip extension are bonded to the guide groove by the insulating pad.

[0014] This application further proposes a lithium-ion battery, including a cell and a casing for encapsulating the cell, wherein the casing is the casing of the lithium-ion battery of the aforementioned embodiment.

[0015] This application further proposes an electronic device including the lithium-ion battery of the aforementioned embodiments.

[0016] The beneficial effects of this technical solution are as follows: By constructing a receiving area on the inner wall of the casing, and sequentially stacking an insulating layer and a separator within the receiving area, the separator achieves effective insulation isolation between itself and the casing and the receiving area through the insulating layer. When the separator abuts against the tabs on the side of the cell, a short circuit will not occur even if tabs of different polarities come into contact with the separator. This eliminates the need for large-area encapsulation insulation on the side of the cell, solving the problem of excessive side space occupied by encapsulation insulation in traditional solutions, which leads to a reduction in the size of the electrode sheets. At the same time, sealing the gap between the separator and the receiving area with sealing tape can prevent electrolyte from penetrating into the insulating layer, avoiding the problems of swelling, aging, or decreased insulation performance caused by long-term immersion of the insulating layer in the electrolyte. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the casing of a lithium-ion battery in one embodiment of this application; Figure 2 for Figure 1 Cross-sectional view at point AA; Figure 3 for Figure 2 A magnified view of a section at point B in the middle; Figure 4 for Figure 2 A cross-sectional view of part of the structure at point AA, and a structural schematic diagram from another perspective; Figure 5 This is a schematic diagram of the top cover assembly. Figure 6 This is a schematic diagram of a lithium-ion battery. Attached image description: 10. The casing of a lithium-ion battery; 100. Housing; 100b. Receiving area; 101. Insulation layer; 102. Partition; 103. Sealing tape; 200. Top cover assembly; 201. Cover plate; 201a. Pole post hole; 202. Pole post; 202a. Column body; 202b. Base; 203. Strip extension section; 204. Insulating pad; 205. Guide groove; E. Battery cell; F. Tab. Detailed Implementation

[0019] The solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments in this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0021] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0022] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0023] This utility model's lithium-ion battery casing primarily addresses the problem of short circuits caused by the tabs of side-mounted cells contacting the inner wall of the casing after encapsulation. Specifically, in related technologies, insulating tape is typically wrapped around the tabs to prevent contact. However, this tape swells, corrodes, or ages after prolonged immersion in electrolyte, leading to decreased insulation performance and still posing a short circuit risk. Furthermore, large-area encapsulation occupies space on the side of the cell, necessitating a reduction in cell size to avoid interference with the casing's inner wall, thus lowering the battery's energy density. Therefore, this application constructs a receiving area on the inner wall of the casing, and sequentially stacks an insulating layer and a separator within this area. The separator effectively insulates the casing and receiving area through the insulating layer. When the separator comes into contact with the tabs on the side of the cell, even if tabs of different polarities contact the separator, a short circuit will not occur, eliminating the need for large-area encapsulation on the side of the cell.

[0024] This application provides an embodiment of a lithium-ion battery casing, referring to... Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the casing of a lithium-ion battery according to one embodiment of this application. Figure 2 for Figure 1In the cross-sectional view at point AA, in this embodiment, the outer casing 10 of the lithium-ion battery includes a top cover assembly 200 and a housing 100 for accommodating the battery cell E. The top cover assembly 200 covers the opening end of the housing 100. The inner wall of the housing 100 is configured with a receiving area 100b, which extends along the height direction of the housing 100. The receiving area 100b is provided with an insulating layer 101 and a separator 102 from the inside to the outside. The separator 102 is used to abut against the tab F on the side of the battery cell E. The gap between the separator 102 and the side wall of the receiving area 100b is sealed by a sealing tape 103.

[0025] In this embodiment, the top cover assembly 200 is mainly used to cover the opening end of the housing 100 after the battery cell E is placed in the housing 100 and electrolyte is injected, thereby sealing the housing 100. The shape of the top cover assembly 200 is adapted to the opening end of the housing 100 and can be circular, square, or other irregularly shaped. Regarding material selection, the top cover assembly 200 can be made of aluminum alloy, stainless steel, or nickel-plated steel, or, depending on actual needs, the same material as the housing 100 can be selected to facilitate subsequent welding. The connection between the top cover assembly 200 and the housing 100 can be achieved through laser welding, resistance welding, ultrasonic welding, or other methods to ensure the sealing performance inside the battery. In some embodiments, the top cover assembly 200 may also be provided with positive and negative terminals, a safety valve, and an electrolyte injection port. In this embodiment, the housing 100 is mainly used to accommodate the battery cell E and can be manufactured using processes such as stretch forming, stamping, or deep drawing. The material can be corrosion-resistant metal materials such as aluminum alloy or stainless steel.

[0026] The inner wall of the housing 100 has a receiving area 100b, which can be formed by stamping, laser cutting, machining, etching, or mold forming. The receiving area 100b extends along the height direction of the housing 100 and penetrates the opening end of the housing 100, forming a recessed groove structure along the inner wall of the housing 100. The depth of the receiving area 100b is moderate, sufficient to accommodate the stacked structure of the insulating layer 101 and the partition 102 without excessively weakening the structural strength of the housing 100. The width can be determined according to the size of the tab F.

[0027] An insulating layer 101 and a partition 102 are stacked sequentially from the inside to the outside within the receiving area 100b. The insulating layer 101 is tightly attached to the bottom and side walls of the receiving area 100b, serving to electrically isolate the partition 102 from the housing 100. The insulating layer 101 can be made of high-molecular materials with excellent electrolyte resistance and insulation properties, such as polypropylene, polyethylene terephthalate, polyimide, and polytetrafluoroethylene, with a moderate thickness to ensure insulation effectiveness. The insulating layer 101 can be fixed within the receiving area 100b by methods such as adhesion, hot pressing, or adhesive bonding. The partition 102 is located on the outside of the insulating layer 101 and is used to abut against the tab F on the side of the battery cell E. The width and length of the partition 102 need to be smaller than the width and length of the receiving area 100b. Specifically, an appropriate gap is maintained between the partition 102 and the sidewall of the receiving area 100b, so that after being stacked with the insulating layer 101, the partition 102 will not directly contact the inner wall of the receiving area 100b, thus avoiding short circuits. The material of the partition 102 can be conductive metal materials such as aluminum alloy, copper alloy, stainless steel, or nickel-plated steel plate, with an appropriate thickness to ensure sufficient structural strength. In some embodiments, the partition 102 can be a flat plate structure, or it can be designed as a shaped plate with protrusions or positioning structures to facilitate better contact and positioning with the tab F.

[0028] Furthermore, the gap between the separator 102 and the sidewall of the accommodating area 100b is sealed with sealing tape 103. This sealing tape 103 is a corrosion-resistant tape that can be immersed in electrolyte for extended periods without swelling, detachment, or decreased adhesion, maintaining good sealing performance. The sealing tape 103 can be made of materials with electrolyte resistance, such as butyl rubber tape, modified polypropylene tape, fluororubber tape, or polyimide tape. Its width should completely cover the gap between the separator 102 and the accommodating area 100b, and its thickness should be moderate to ensure a good seal. It is worth noting that after the insulating layer 101, separator 102, and sealing tape 103 are assembled, because the accommodating area 100b itself has an inwardly recessed structure, it will not protrude excessively into the inner cavity of the casing 100, thus providing sufficient space for the battery cell E and the tab F, while simultaneously increasing the battery's energy density. In other words, unlike traditional structures, it does not require reducing the size of the battery cell E to avoid contact between the tab F and the inner wall of the housing 100, or requiring a large area of ​​coating on the surface of the tab F.

[0029] In the actual assembly process, firstly, a receiving area 100b is formed on the inner wall of the housing 100 by stamping or other processing methods. Then, an insulating layer 101 is attached or fixed to the bottom and side walls of the receiving area 100b, so that the insulating layer 101 completely covers the inner surface of the receiving area 100b. Next, a partition 102 is placed on the outside of the insulating layer 101, at which point there is a gap between the partition 102 and the side wall of the receiving area 100b. Subsequently, sealant tape 103 is pasted along the periphery of the partition 102 to seal the gap between the partition 102 and the side wall of the receiving area 100b, forming a relatively closed sealed space.

[0030] In this way, the sealing tape 103 and the partition 102 seal the accommodating area 100b to form a sealed space, preventing or making it difficult for the electrolyte to penetrate into the sealed space. Therefore, the internal insulating layer 101 avoids direct contact with the electrolyte, avoiding problems such as swelling, aging, or decreased insulation performance caused by prolonged immersion. Even if a small amount of electrolyte penetrates, the insulation layer 101 itself has a certain resistance to electrolyte and does not directly bear the mechanical stress of the tab F, so its insulation performance can remain stable for a long time.

[0031] When the battery cell E is installed into the housing 100, the tabs F on the side of the battery cell E will naturally abut against the separator 102. Since the separator 102 achieves effective electrical isolation from the housing 100 and the receiving area 100b through the insulating layer 101, even if tabs F of different polarities simultaneously contact the separator 102, a short circuit will not be formed between the separator 102 and the housing 100. The separator 102 can be a conductive material or an insulating material. When a conductive material is used, the separator 102 still maintains electrical isolation from the housing 100 due to the presence of the insulating layer 101.

[0032] Meanwhile, since the overall structure of the insulating layer 101, separator 102, and sealing tape 103 is located within the recessed space of the accommodating area 100b after assembly, it will not excessively occupy the internal space of the housing 100, thus reserving ample space for the battery cell E and the tab F. Compared with the traditional solution, this solution does not require large-area adhesive insulation treatment on the surface of the tab F, nor does it require reducing the size of the battery cell E to avoid the tab F from contacting the inner wall of the housing 100. Therefore, it can accommodate a larger battery cell E within the same housing 100 size, thereby improving the energy density and capacity of the battery.

[0033] In addition, since the separator 102 is a relatively rigid plate structure, compared with the traditional encapsulation method, the separator 102 can better withstand the expansion force generated by the cell E during charging and discharging, and prevent the tab F from directly squeezing the inner wall of the casing 100, thereby further improving the safety and service life of the battery.

[0034] The beneficial effects of this application's technical solution are as follows: By constructing a receiving area 100b on the inner wall of the housing 100, and sequentially stacking an insulating layer 101 and a partition 102 within the receiving area 100b, the partition 102 achieves effective insulation isolation from the housing 100 and the receiving area 100b through the insulating layer 101. When the partition 102 abuts against the tab F on the side of the cell E, even if the tab F of different polarities contacts the partition 102, a short circuit will not occur. Therefore, it is not necessary to perform large-area encapsulation insulation treatment on the side of the cell E, solving the problem of excessive side space occupied by encapsulation insulation in traditional solutions, which leads to a reduction in the size of the electrode sheet. At the same time, by sealing the gap between the partition 102 and the receiving area 100b with sealing tape 103, the electrolyte can be prevented from penetrating into the insulating layer 101, avoiding the problems of swelling, aging, or decreased insulation performance caused by the insulating layer 101 being immersed in the electrolyte for a long time.

[0035] In a preferred embodiment, the partition 102 has a width of W1 and a height of H1; the accommodating area 100b has a width of W2 and a height of H2, and satisfies the following relationship: W1 < W2; H1 < H2.

[0036] This relationship indicates that the width and height of the partition 102 are both smaller than the width and height of the accommodating area 100b, so that the partition 102 maintains a gap with the side wall of the accommodating area 100b, thereby avoiding the partition 102 directly contacting the inner wall of the accommodating area 100b and causing a short circuit.

[0037] For example, the width W2 of the accommodating area 100b can be 10mm and the height H2 can be 100mm. Correspondingly, the width W1 of the partition 102 can be set to 8mm and the height H1 can be set to 98mm. In this way, the partition 102 and the side wall of the accommodating area 100b have a gap of about 1mm in the width direction and a gap of about 2mm in the height direction. This ensures that the partition 102 will not directly contact the inner wall of the accommodating area 100b, and can effectively support and abut the tab F.

[0038] For example, when the width W2 of the accommodating area 100b is 15mm and the height H2 is 120mm, the width W1 of the partition 102 can be set to 12mm and the height H1 to 116mm, so that the partition 102 and the side wall of the accommodating area 100b have a gap of about 1.5mm in the width direction and a gap of about 4mm in the height direction. This configuration is suitable for larger cell E structures.

[0039] For example, the width W2 of the accommodating area 100b can be 8mm and the height H2 can be 80mm. The width W1 of the separator 102 is set to 6mm and the height H1 is set to 78mm, so that the separator 102 and the side wall of the accommodating area 100b have a gap of about 1mm in the width direction and a gap of about 2mm in the height direction. This smaller size configuration is suitable for applications with small batteries or small battery capacity.

[0040] Through the design of the above-mentioned dimensional relationship, the partition 102 always maintains a certain gap between itself and the side wall of the accommodating area 100b. This gap is then sealed by the sealing tape 103, which not only achieves the sealing protection of the accommodating area 100b, but also ensures the electrical isolation between the partition 102 and the housing 100, effectively preventing the risk of short circuit that may be caused by direct contact between the partition 102 and the inner wall of the accommodating area 100b.

[0041] In a preferred embodiment, the insulating layer 101 has a height of H3 and a width of W3, and satisfies the following relationship: H3≤H2; W3≤W2.

[0042] This relationship indicates that the height and width of the insulating layer 101 are both less than or equal to the height and width of the accommodating region 100b, so that the insulating layer 101 can completely adhere to the bottom wall and side wall of the accommodating region 100b, achieving full coverage of the inner surface of the accommodating region 100b, thereby effectively isolating the partition 102 from the housing 100.

[0043] For example, when the width W2 of the accommodating area 100b is 10mm and the height H2 is 100mm, the width W3 of the insulating layer 101 can be set to 10mm and the height H3 can be set to 100mm. That is, the size of the insulating layer 101 is exactly the same as that of the accommodating area 100b. In this way, the insulating layer 101 can completely cover the entire inner surface of the accommodating area 100b and provide the best insulation protection effect.

[0044] For example, when the width W2 of the accommodating area 100b is 15mm and the height H2 is 120mm, the width W3 of the insulating layer 101 can be set to 14mm and the height H3 can be set to 118mm. That is, the size of the insulating layer 101 is slightly smaller than the size of the accommodating area 100b. This design facilitates the assembly and positioning of the insulating layer 101, while still covering the main area of ​​the accommodating area 100b, ensuring effective insulation between the partition 102 and the bottom wall and main side wall areas of the accommodating area 100b.

[0045] For example, when the width W2 of the accommodating area 100b is 8mm and the height H2 is 80mm, the width W3 of the insulating layer 101 can be set to 8mm and the height H3 can be set to 78mm. That is, the width of the insulating layer 101 is equal to that of the accommodating area 100b, while the height is slightly less than that of the accommodating area 100b. This ensures complete coverage in the width direction and provides a certain assembly allowance in the height direction.

[0046] Through the above-mentioned dimensional design, the insulating layer 101 can flexibly adapt to the size of the receiving area 100b. It can not only completely cover the inner surface of the receiving area 100b, but also appropriately reduce its size according to actual assembly needs, ensuring that the insulating layer 101 can be smoothly attached to the receiving area 100b, and providing a good foundation for the subsequent installation of the partition 102 and the sealing tape 103.

[0047] Continue reading Figure 2 In a preferred embodiment, one end of the partition 102 extends along the height direction of the housing 100 and abuts against the side of the top cover assembly 200 facing the opening of the housing 100. Thus, the partition 102 not only provides support and insulation for the tab F on the side of the battery cell E, but its end extending to the opening of the housing 100 can also make contact with the top cover assembly 200. Specifically, after extending, the partition 102 abuts against the strip extension 203 provided on the top cover assembly 200. This strip extension 203 extends downward from the inside of the top cover assembly 200, forming a tight contact with the upper end of the partition 102. When the partition 102 is made of a conductive material, the abutment between the partition 102 and the strip extension 203 of the top cover assembly 200 forms a conductive structure, thereby achieving an electrical connection between the tab F of the battery cell E and the electrode terminals on the top cover assembly 200. In this way, the tab F of the cell E first contacts the separator 102, and the current is then conducted through the separator 102 to the strip extension 203 of the top cover assembly 200, and finally transmitted to the positive and negative terminals on the top cover assembly 200, forming a complete conductive path.

[0048] Thus, the separator 102 not only provides insulation and positioning support for the tab F, but also functions as a conductive connection, simplifying the internal electrical connection structure of the battery, reducing the use of additional conductive components, and lowering assembly difficulty and cost. Simultaneously, the abutting fit between the separator 102 and the strip extension 203 of the top cover assembly 200 enhances the stability of the overall structure, preventing displacement or shaking of the cell E during charging and discharging.

[0049] See Figure 3 In a preferred embodiment, the thickness of the insulating layer 101 is T1, the thickness of the partition 102 is T2, and the depth of the accommodating region 100b is T3, and the following conditions are met: T1+T2≥T3.

[0050] This relationship indicates that the sum of the thickness of the insulating layer 101 and the thickness of the separator 102 is greater than or equal to the depth of the accommodating region 100b, meaning that the insulating layer 101 and the separator 102, when stacked, just fill the depth space of the accommodating region 100b. With this design, after the insulating layer 101 and the separator 102 are assembled, the outer surface of the separator 102 can be basically flush with or slightly recessed from the inner wall of the housing 100, without protruding into the inner cavity of the housing 100. This maximizes the utilization of the internal space of the housing 100, reserving more space for the cell E and the tab F, thereby improving the energy density of the battery.

[0051] Specifically, for example, when the depth T3 of the accommodating area 100b is 3mm, the thickness T1 of the insulating layer 101 can be set to 0.5mm, and the thickness T2 of the partition 102 can be set to 2.5mm. The sum of the two is exactly equal to the depth of the accommodating area 100b, so that the partition 102 is flush with the inner wall of the housing 100 after assembly.

[0052] For example, when the depth T3 of the accommodating area 100b is 5mm, the thickness T1 of the insulating layer 101 can be set to 1mm, and the thickness T2 of the partition 102 can be set to 4mm. This configuration is suitable for application scenarios that require a thicker partition 102 to withstand greater mechanical stress.

[0053] For example, when the depth T3 of the accommodating area 100b is 2mm, the thickness T1 of the insulating layer 101 can be set to 0.3mm, and the thickness T2 of the separator 102 can be set to 1.7mm. This thinner configuration is suitable for small battery designs with extremely high space utilization requirements.

[0054] By precisely matching the thickness relationships described above, it can be ensured that the insulation layer 101 and the partition 102 will not occupy any additional space inside the housing 100 after assembly, thus achieving structural compactness and optimal space utilization.

[0055] See Figure 4 and Figure 5 In a preferred embodiment, the top cover assembly 200 includes: Cover plate 201, the middle part of cover plate 201 has pole hole 201a; The pole post 202 has a column body 202a and a base 202b connected to each other. The column body 202a is disposed in the pole post hole 201a, and the base 202b is exposed on the side of the cover plate 201 facing the opening end of the housing 100. The outer wall of the base 202b is constructed with a strip-shaped extension 203, which extends radially along the cover plate 201 and abuts against the partition plate 102.

[0056] In this embodiment, the cover plate 201 of the top cover assembly 200 has a pole post hole 201a in the middle, which penetrates the cover plate 201 and is used to install the pole post 202. The pole post 202 includes a connected column body 202a and a base 202b, wherein the column body 202a is partially inserted into and disposed in the pole post hole 201a, and the column body 202a can extend upward to the outside of the cover plate 201 for connection with external circuitry. The base 202b of the pole post 202 is exposed on the side of the cover plate 201 facing the opening end of the housing 100, that is, located on the inner side of the cover plate 201. The size of the base 202b is usually larger than that of the column body 202a, forming a stepped structure for easy fixing and sealing.

[0057] Specifically, the outer wall of the base 202b is constructed with a strip-shaped extension section 203, which extends radially outward from the base 202b along the cover plate 201 to form an extension arm or extension plate structure. The end of the strip-shaped extension section 203 extends toward the inner wall of the housing 100 and abuts against the upper end of the aforementioned partition 102. Thus, when the battery cell E is installed into the housing 100, the tab F on the side of the battery cell E contacts the partition 102, and the current can be conducted from the tab F to the partition 102. At the same time, it can extend to the extension section for welding, and then be conducted through the abutment between the partition 102 and the strip-shaped extension section 203 to the strip-shaped extension section 203, and finally through the strip-shaped extension section 203 to the base 202b of the electrode post 202, and output outward through the post 202a, thereby forming a complete conductive path.

[0058] Thus, the overlap between the strip extension 203 and the partition 102 forms a reliable conductive connection, avoiding the complex process of additional welding or the use of conductive sheets in traditional solutions. At the same time, the radial extension design of the strip extension 203 can adapt to different tab F layouts, improving structural adaptability and assembly flexibility.

[0059] Continue reading Figure 4 and Figure 5 In a preferred embodiment, an insulating pad 204 is provided between the base 202b, the strip extension 203 and the cover plate 201.

[0060] In this embodiment, an insulating pad 204 is provided between the base 202b of the pole post 202 and the strip extension 203 and the cover plate 201. The insulating pad 204 serves to provide electrical isolation and sealing. The insulating pad 204 can be made of rubber, silicone, polytetrafluoroethylene, or other materials with good insulation and electrolyte resistance.

[0061] Specifically, the insulating pad 204 is disposed between the surface of the base 202b and the surface of the cover plate 201, and between the surface of the strip extension 203 and the surface of the cover plate 201, forming an insulating layer. This prevents direct electrical contact between the base 202b and the strip extension 203 of the terminal post 202 and the cover plate 201, avoiding the risk of short circuits caused by the connection between the cover plate 201 and the housing 100. Simultaneously, the insulating pad 204 also forms a sealing structure between the terminal post 202 and the cover plate 201, preventing electrolyte leakage from the terminal post hole 201a, thus improving the battery's sealing and safety.

[0062] Continue reading Figure 5 In a preferred embodiment, a guide groove 205 is formed on the side of the cover plate 201 facing the opening end of the housing 100. The base 202b and the strip extension 203 are bonded to the guide groove 205 by an insulating pad 204. In this embodiment, the guide groove 205 is provided on the inner side of the cover plate 201 facing the opening end of the housing 100. The shape of the guide groove 205 matches the shape of the base 202b of the pole post 202 and the strip extension 203 to form a receiving space. The guide groove 205 can be formed on the cover plate 201 by stamping, machining or die forming, etc., and its depth is moderate enough to accommodate the overall structure of the base 202b and the strip extension 203.

[0063] During assembly, the insulating pad 204 is first placed in the guide groove 205. Then, the base 202b and the strip extension 203 of the pole post 202 are aligned with the guide groove 205. The insulating pad 204 provides adhesion, fixing the base 202b and the strip extension 203 within the guide groove 205. The insulating pad 204 not only provides insulation but also, through its adhesive properties, firmly secures the base 202b and the strip extension 203 within the guide groove 205, preventing displacement or loosening during assembly and use.

[0064] Thus, the guide groove 205 provides precise positioning and fixing space for the base 202b and the strip extension 203, ensuring that the pole post 202 and the strip extension 203 are installed in the correct positions and avoiding assembly deviations. At the same time, the guide groove 205 makes the overall structure more compact, preventing the base 202b and the strip extension 203 from excessively protruding into the inner cavity of the housing 100, saving space. Furthermore, the constraint of the guide groove 205 and the adhesion of the insulating gasket 204 improve the assembly stability and sealing reliability of the pole post 202 assembly.

[0065] See Figure 6This application further proposes a lithium-ion battery, including a cell E and a casing for encapsulating the cell E, wherein the casing is the casing 10 of the lithium-ion battery described in the foregoing embodiments. The specific structure of this subject matter refers to the above embodiments. Since this lithium-ion battery adopts all the technical solutions of all the above embodiments, it has at least all the technical effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0066] In this embodiment, the lithium-ion battery cell E can take various forms, such as a square cell E, a cylindrical cell E, or a pouch cell E. The cell E internally includes conventional components such as a positive electrode, a negative electrode, a separator, and an electrolyte. A tab F is provided on the side of the cell E, which extends from the side of the cell E and is used to make an electrical connection with the top cover assembly 200 of the outer casing.

[0067] The outer casing adopts the lithium-ion battery casing structure described in any of the aforementioned embodiments, including a casing 100 and a top cover assembly 200. The inner wall of the casing 100 has a receiving area 100b. An insulating layer 101 and a separator 102 are sequentially arranged from the inside to the outside of the receiving area 100b. The gap between the separator 102 and the receiving area 100b is sealed with sealing tape 103. During assembly, the battery cell E is placed inside the casing 100, and the tab F on the side of the battery cell E naturally abuts against the separator 102. The separator 102 is electrically isolated from the casing 100 through the insulating layer 101, avoiding the risk of short circuit caused by direct contact between the tab F and the casing 100. Electrolyte is then injected into the casing 100, and the top cover assembly 200 is placed over the opening of the casing 100. The top cover assembly 200 is then sealed to the casing 100 by welding, completing the encapsulation of the lithium-ion battery.

[0068] The specific structure of the lithium-ion battery is as described in the above embodiments. Since this lithium-ion battery adopts all the technical solutions of all the above embodiments, it has at least all the technical effects brought about by the technical solutions of the above embodiments, including effectively preventing short circuits between the tab F and the casing 100, avoiding performance degradation caused by long-term immersion of the insulating layer 101 in electrolyte, improving battery energy density, and enhancing structural stability.

[0069] This application further proposes an electronic device including the lithium-ion battery of the aforementioned embodiments.

[0070] The electronic device can be a smartphone, tablet, laptop, smartwatch, drone, power tool, electric vehicle, or other portable or mobile device that requires lithium-ion battery power. The electronic device has a battery compartment for housing the lithium-ion battery, which is connected to the circuit board of the electronic device via electrical connection terminals to provide power to the various functional modules of the electronic device.

[0071] Because this electronic device uses the lithium-ion battery described in the aforementioned embodiment, which has a good insulation protection structure and short-circuit protection design, it can effectively avoid the risk of short circuit between the cell's E-tab F and the casing 100, significantly improving the battery's safety performance. Simultaneously, the internal insulation layer 101 of the lithium-ion battery is isolated from the electrolyte by the sealing tape 103, preventing a decline in insulation performance due to long-term immersion, further enhancing the battery's reliability and safety during long-term use.

[0072] In summary, by adopting the lithium-ion battery of the aforementioned embodiments, this electronic device has achieved significant improvements in safety performance, reliability, and battery life, making it suitable for various application scenarios with high requirements for battery performance and safety.

[0073] The above description is only a part or preferred embodiment of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A casing for a lithium-ion battery, characterized in that, The device includes a top cover assembly and a housing for accommodating battery cells. The top cover assembly covers the open end of the housing. The inner wall of the housing has a receiving area that extends along the height of the housing. The receiving area has an insulating layer and a partition arranged sequentially from the inside to the outside. The partition is used to abut against the tabs on the side of the battery cells. The gap between the partition and the side wall of the receiving area is sealed with sealant.

2. The casing of the lithium-ion battery according to claim 1, characterized in that, The partition has a width of W1 and a height of H1; the accommodating area has a width of W2 and a height of H2, and satisfies the following relationship: W1 < W2; H1 < H2.

3. The casing of the lithium-ion battery according to claim 2, characterized in that, The insulating layer has a height of H3 and a width of W3, and satisfies the following relationship: H3≤H2; W3≤W2.

4. The casing of the lithium-ion battery according to claim 2 or 3, characterized in that, One end of the partition extends along the height direction of the housing and abuts against the side of the top cover assembly facing the opening end of the housing.

5. The casing of the lithium-ion battery according to claim 4, characterized in that, The thickness of the insulating layer is T1, the thickness of the partition is T2, and the depth of the accommodating region is T3, and the following conditions are met: T1+T2≥T3.

6. The casing of the lithium-ion battery according to claim 1, characterized in that, The top cover assembly includes: A cover plate, wherein a pole hole is formed in the middle of the cover plate; The pole has a connected column and a base, the column being disposed within the pole hole, the base being exposed on the side of the cover plate facing the opening end of the housing, the outer wall of the base being constructed with a strip-shaped extension, the strip-shaped extension extending radially along the cover plate and abutting against the partition plate.

7. The casing of the lithium-ion battery according to claim 6, characterized in that, An insulating pad is provided between the base, the strip extension, and the cover plate.

8. The casing of the lithium-ion battery according to claim 7, characterized in that, The cover plate has a guide groove on the side facing the opening end of the housing, and the base and the strip extension are bonded to the guide groove by the insulating pad.

9. A lithium-ion battery, characterized in that, It includes a battery cell and a casing for encapsulating the battery cell, wherein the casing is the casing of a lithium-ion battery according to any one of claims 1 to 8.

10. An electronic device, characterized in that, Including the lithium-ion battery as described in claim 9.

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