Lithium battery cover plate and lithium battery

Abstract

The utility model relates to a kind of lithium battery cover plate and lithium battery, and lithium battery includes lithium battery cover plate.Lithium battery cover plate includes bottom plate, upper cover and honeycomb component, and the window is opened in bottom plate, and the window is provided with several horizontal bars, and one horizontal bar is provided with first mounting hole;Upper cover is set on bottom plate, and upper cover is provided with second mounting hole;Honeycomb component is provided with third mounting hole, and honeycomb component includes at least two honeycomb layers, each honeycomb layer is sequentially stacked and set on upper cover, and the honeycomb hole of adjacent two honeycomb layers is mutually aligned, and each honeycomb layer is located between upper cover and bottom plate;Third mounting hole penetrates each honeycomb layer, and the both ends of third mounting hole are respectively aligned first mounting hole and second mounting hole.Such, it can enhance the structure protection performance, effectively reduce the damage of external impact on explosion-proof structure in the process of transportation or transfer, avoid battery failure caused by accidental rupture.It can also avoid forming large-area pressure relief opening on lithium battery cover plate, reduce the risk of fire.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and more particularly to lithium battery cover plates and lithium batteries. Background Technology

[0002] Lithium-ion batteries typically consist of a casing, a top cover, and battery cells. The battery cells are housed inside the casing, while the top cover is located at the opening in the casing. Together, the top cover and casing enclose the battery cells. To prevent accidental explosions, an explosion-proof membrane or valve is usually installed at the top cover. However, during transportation, the explosion-proof membrane is prone to accidental rupture, leading to battery failure. While explosion-proof valves provide good protection during transport, if they rupture upon reaching a critical pressure value, they create a large pressure relief opening, exposing excessive amounts of the battery cells to the air, thus posing a significant fire risk. Utility Model Content

[0003] This utility model provides a lithium battery cover and a lithium battery, which can solve the problems of easy damage to the explosion-proof structure and easy fire after rupture and pressure relief.

[0004] This utility model provides a lithium battery cover plate, which includes:

[0005] A base plate, wherein a window is provided on the base plate, and a plurality of horizontal bars are provided on the window, one of which is provided with a first mounting hole;

[0006] The upper cover, which is disposed on the base plate, is provided with a second mounting hole; and

[0007] A cellular module, wherein a third mounting hole is provided on the cellular module, the cellular module includes at least two cellular layers, each of the cellular layers is stacked one by one on the upper cover, and the cellular holes of two adjacent cellular layers are aligned with each other, and each cellular layer is located between the upper cover and the bottom plate;

[0008] The third mounting hole penetrates each of the honeycomb layers, and the two ends of the third mounting hole are respectively aligned with the first mounting hole and the second mounting hole.

[0009] Preferably, the walls of each of the honeycomb cells are provided with a peripheral hydrophobic coating; and / or

[0010] The honeycomb layer abuts against the base plate, thereby defining multiple pressure relief zones on the base plate by each honeycomb hole, and a bottom wall hydrophobic coating is provided at the bottom of the pressure relief zone.

[0011] Preferably, the honeycomb holes are hexagonal, square, or triangular.

[0012] Preferably, the diameter of the honeycomb pores is 0.16mm to 1.12mm.

[0013] Preferably, the thickness of the cellular component is 0.23 mm to 2.37 mm.

[0014] Preferably, one of the honeycomb layers is 3D printed onto the top cover, and the other honeycomb layers are 3D printed one by one.

[0015] Preferably, one of the honeycomb layers is integrally formed or welded to the upper cover, while the other honeycomb layers are welded to each other one by one.

[0016] Preferably, the lithium battery cover further includes two poles, and two clearance holes are formed on the honeycomb assembly. The clearance holes penetrate each of the honeycomb layers, and each pole is disposed on the base plate. Each pole passes through the two clearance holes and is inserted into the top cover.

[0017] Preferably, a sealing gap is provided between the periphery of the base plate and the periphery of the top cover, and a sealing ring is provided within the sealing gap.

[0018] This utility model also provides a lithium battery, which includes a shell, a battery cell, and a lithium battery cover plate as described in any of the above technical solutions. The lithium battery cover plate is disposed on the shell, and the shell and the lithium battery cover plate together enclose a storage cavity, and the battery cell is disposed in the storage cavity.

[0019] Preferably, the lithium battery further includes a sealing unit, which passes through the first mounting hole, the second mounting hole, and the third mounting hole.

[0020] The following are the beneficial effects of implementing this utility model:

[0021] This utility model relates to a lithium battery cover and a lithium battery, the lithium battery including the lithium battery cover. The lithium battery cover is constructed by setting a honeycomb assembly comprising at least two honeycomb layers, stacking each honeycomb layer sequentially on the cover, with the honeycomb holes of adjacent honeycomb layers aligned with each other, thereby enhancing structural protection performance, effectively reducing damage to the explosion-proof structure from external impacts during transportation or transshipment, and preventing battery failure due to accidental breakage.

[0022] Meanwhile, since each honeycomb layer is set up one by one, during the explosion process, firstly, each honeycomb layer can form a multi-level protection in sequence, so that it explodes step by step when the pressure is abnormal; secondly, the honeycomb holes of each layer can be aligned with each other to form multiple independent pressure relief channels, thus forming multiple independent pressure relief positions on the lithium battery cover. In this way, it avoids the lithium battery cover from directly forming a large area of ​​pressure relief opening when the pressure is abnormal, preventing excessive exposure of the battery cell and significantly reducing the risk of fire.

[0023] In addition, the use of cellular modules can improve the structural strength of the lithium battery cover while effectively reducing the overall weight of the lithium battery. This is especially important when lithium batteries need to be assembled into lithium battery packs, as it can greatly ensure the lightweight design of the lithium battery packs. Attached Figure Description

[0024] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally denote like parts.

[0025] Figure 1 This is a schematic diagram of the structure of the lithium battery cover plate in some embodiments of this utility model;

[0026] Figure 2 From another perspective Figure 1 The diagram shows the structure of the lithium battery cover.

[0027] Figure 3 yes Figure 2 The enlarged view of the lithium battery cover at point A is shown.

[0028] Figure 4 From another perspective Figure 2 The diagram shows the structure of the lithium battery cover.

[0029] Figure 5 This is a schematic diagram of the internal structure of the lithium battery cover in some embodiments of this utility model;

[0030] Figure 6 yes Figure 5 The enlarged view of the lithium battery cover at point B is shown.

[0031] Figure 7 This is a schematic diagram of the structure of a lithium battery in some embodiments of this utility model.

[0032] Reference numerals: 10-Lithium battery cover; 1-Bottom plate; 11-Window; 12-Horizontal bar; 13-First mounting hole; 14-Pressure relief area; 141-Liquid-repellent coating on bottom wall;

[0033] 2-Top cover; 21-Second mounting hole;

[0034] 3-Cellular module; 31-Cellular layer; 311-Cellular cell; 312-Liquid-repellent coating on peripheral wall; 32-Third mounting hole; 4-Pole post; 5-Sealing gap;

[0035] 20-Lithium battery; 30-Casing; 40-Battery cell; 50-Storage cavity; 60-Sealing unit. Detailed Implementation

[0036] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be more thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0037] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] Figure 1 A lithium battery cover 10 is shown in some embodiments of the present invention, which is used for mounting on the casing of a lithium battery.

[0041] The lithium battery cover 10 includes a base plate 1, an upper cover 2, and a honeycomb assembly 3. The upper cover 2 is disposed on the base plate 1, and the honeycomb assembly 3 is disposed on the upper cover 2. The honeycomb assembly 3 is located between the base plate 1 and the upper cover 2.

[0042] Understandably, the base plate 1 serves to support the top cover 2. The honeycomb component 3 serves to reinforce and prevent large-area damage.

[0043] like Figures 1 to 6 As shown, a window 11 is provided on the base plate 1, and several horizontal bars 12 are provided on the window 11, one of which has a first mounting hole 13.

[0044] The upper cover 2 is mounted on the base plate, and the upper cover 2 is provided with a second mounting hole 21.

[0045] The honeycomb assembly 3 is provided with a third mounting hole 32. The honeycomb assembly 3 includes at least two honeycomb layers 31, which are stacked one by one on the upper cover 2, and the honeycomb holes 311 of two adjacent honeycomb layers 31 are aligned with each other. Each honeycomb layer 31 is located between the upper cover 2 and the bottom plate 1. The third mounting hole 32 penetrates each honeycomb layer 31, and the two ends of the third mounting hole 32 are respectively aligned with the first mounting hole 13 and the second mounting hole 21.

[0046] Understandably, the window 11 reduces overall weight and serves as an initial channel for gas flow. The horizontal bar 12 is a supporting structure spanning the window 11, preventing local deformation of the base plate 1. The second mounting hole 21, the first mounting hole 13, and the third mounting hole 32 work together to form a through mounting channel.

[0047] Each honeycomb layer 31 independently bears the impact load, reducing stress concentration at a single point by dispersing energy layer by layer. The honeycomb holes 311 of adjacent honeycomb layers 31 are aligned, so that each honeycomb layer 31 together forms a continuous and independent pressure relief channel, avoiding uneven pressure distribution caused by airflow diffusion between layers, so that the pressure can be concentrated in a small number of pressure relief channels to quickly complete the rupture and pressure relief, and avoiding the formation of excessively large openings.

[0048] It should be noted that the stacked honeycomb layers 31 fracture sequentially under abnormal pressure, forming a step-by-step pressure relief (e.g., the first layer fractures to release some pressure, while subsequent layers continue to provide protection), avoiding single-point failure that could lead to the entire cover plate tearing. The aligned honeycomb holes 311 form multiple independent pressure relief channels, limiting the pressure relief opening area and preventing large areas of the battery cells from being exposed to air, significantly reducing the risk of fire.

[0049] like Figure 6 As shown, in some embodiments of the lithium battery cover plate 10, a peripheral wall hydrophobic coating 312 is provided on the hole wall of each honeycomb hole 311.

[0050] Understandably, the peripheral wall hydrophobic coating 312 is used to reduce the adhesion of the electrolyte to the pore walls of the honeycomb holes 311, preventing electrolyte stagnation and blockage of the pressure relief channels. The peripheral wall hydrophobic coating 312 ensures the unobstructed flow of the pressure relief channels in case of abnormal pressure, preventing the liquid film from affecting the burst response speed. It also prevents the electrolyte from being directly ejected along with the gas during a burst.

[0051] like Figure 3 and Figure 6 As shown, in some embodiments of the lithium battery cover 10, the honeycomb layer 31 abuts against the base plate 1, so that each honeycomb hole 311 defines a plurality of pressure relief areas 14 on the base plate 1, and the bottom of the pressure relief area 14 is provided with a bottom wall hydrophobic coating 141.

[0052] Understandably, when the pressure relief zone 14 is supported by the honeycomb layer 31 against the base plate 1, each honeycomb hole 311 is defined and formed on the base plate 1, serving as the terminal outlet of the pressure relief channel. The hydrophobic coating 141 on the bottom wall is used to prevent the accumulation of electrolyte in the pressure relief zone 14.

[0053] It should be noted that the synergistic design of the bottom wall hydrophobic coating 141 and the pressure relief zone 14 can reduce the risk of electrochemical corrosion caused by liquid residue and extend the service life of the cover plate.

[0054] In some embodiments of the lithium battery cover 10, the honeycomb holes 311 are hexagonal holes, square holes, or triangular holes.

[0055] It should be noted that configuring the honeycomb holes 311 as hexagonal holes can improve the uniform compressive strength and ensure lightweight design. Configuring them as square holes simplifies the manufacturing process and reduces the difficulty of stamping or 3D printing. Configuring them as triangular holes enhances the local rigidity of the hole walls, resisting shear deformation.

[0056] Specifically, in some embodiments of the lithium battery cover 10, the diameter of the honeycomb holes 311 is 0.16 mm to 1.12 mm.

[0057] Specifically, such as Figure 6 As shown, in some embodiments of the lithium battery cover 10, the thickness T of the honeycomb component 3 is 0.23 mm to 2.37 mm.

[0058] like Figure 6 As shown, in some embodiments of the lithium battery cover 10, one of the honeycomb layers 31 is 3D printed onto the upper cover 2, and the other honeycomb layers 31 are 3D printed one by one.

[0059] Understandably, one of the honeycomb layers 31 is directly formed onto the surface of the upper cover 2 via 3D printing, achieving a seamless, integrated connection between the honeycomb layer 31 and the upper cover 2. The remaining honeycomb layers 31 are stacked one by one via 3D printing based on the first layer position, which can form a multi-level honeycomb layer 31 while ensuring a seamless connection.

[0060] It should be noted that each honeycomb layer 31 is set by 3D printing, which can eliminate the tedious manual alignment of each honeycomb layer 31, and also eliminate the need for unnecessary connecting structures, such as adhesives or rivets.

[0061] like Figure 6 As shown, in some embodiments of the lithium battery cover 10, one of the honeycomb layers 31 is integrally formed or welded to the upper cover 2, and the other honeycomb layers 31 are welded one by one.

[0062] Understandably, the honeycomb layer 31 (i.e., the first honeycomb layer) directly set in the upper cover 2 can have at least two setting methods: First, the honeycomb layer 31 is integrally formed with the upper cover 2 through casting or injection molding, so that the honeycomb layer 31 and the upper cover 2 form a continuous material structure without interface. Second, the honeycomb layer 31 is fixed to the surface of the upper cover 2 by laser welding, ultrasonic welding or resistance welding, forming a metallurgical bonding interface.

[0063] Furthermore, the remaining honeycomb layers 31, except for the first honeycomb layer 31, are stacked on the first honeycomb layer 31 one by one by welding. Adjacent layers are joined by welding points or welds, and the honeycomb holes 311 of each layer are kept aligned with each other.

[0064] like Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments of the lithium battery cover 10, the lithium battery cover 10 also includes two pole posts 4, and two clearance holes are opened on the honeycomb assembly 3. The clearance holes penetrate each honeycomb layer 31, and each pole post 4 is disposed on the base plate 1. Each pole post 4 passes through the two clearance holes and is installed in the top cover 2.

[0065] Understandably, the clearance hole is used to provide a passage for the terminal post 4 to prevent structural interference. The terminal post 4 is used to enable conduction between the lithium battery cell and the external circuitry.

[0066] It should be noted that the diameter of the clearance hole can be flexibly set, but the hole wall and the electrode post 4 can be configured with a clearance fit to prevent current discharge between the electrode post 4 and the hole wall, thereby reducing the risk of product use and improving product safety. Furthermore, although the location of the clearance hole will result in incomplete honeycomb cells in the honeycomb module 3 at that location, these incomplete cells are misaligned with the main body of the battery cell and vulnerable locations on the lithium battery cover, thus still ensuring the structural strength and resistance to large-area explosions of the honeycomb module 3.

[0067] like Figure 2 As shown, in some embodiments of the lithium battery cover 10, a sealing gap 5 is provided between the periphery of the bottom plate 1 and the periphery of the top cover 2, and a sealing ring is provided within the sealing gap 5.

[0068] Understandably, the sealing gap 5 forms an annular isolation zone between the periphery of the base plate 1 and the periphery of the top cover 2. The sealing ring is embedded within the sealing gap 5.

[0069] After the lithium battery cover 10 is assembled into a lithium battery, the sealing ring can prevent electrolyte from seeping out from the periphery of the lithium battery cover 10, thus improving safety.

[0070] Figure 7 The following shows a lithium battery 20 in some embodiments of the present invention. The lithium battery 20 includes a housing 30, a battery cell 40 and a lithium battery cover plate 10. The lithium battery cover plate 10 is disposed on the housing 30. The housing 30 and the lithium battery cover plate 10 together enclose a storage cavity 50. The battery cell 40 is disposed in the storage cavity 50.

[0071] Understandably, the outer casing 30 and the lithium battery cover 10 are assembled together to form a storage cavity 50. The battery cell 40, which is located in the storage cavity 50, is connected to an external circuit through its terminals.

[0072] It should be noted that after the lithium battery cover 10 is correctly aligned and assembled onto the outer casing 30, the honeycomb holes will be directly connected to the storage cavity 50, thereby achieving the required pressure relief.

[0073] like Figure 7 As shown, in some embodiments of the lithium battery 20, the lithium battery 20 further includes a sealing unit 60, which passes through the first mounting hole 13, the second mounting hole 21 and the third mounting hole 32.

[0074] Understandably, the sealing unit 60 passes through the first mounting hole 13, the second mounting hole 21 and the third mounting hole 32, thereby axially locking the base plate 1, the top cover 2 and the honeycomb assembly 3, thereby constraining the interlayer displacement of each assembly.

[0075] The following are the beneficial effects of implementing this utility model:

[0076] This utility model relates to a lithium battery cover and a lithium battery, the lithium battery including the lithium battery cover. The lithium battery cover is constructed by setting a honeycomb assembly comprising at least two honeycomb layers, stacking each honeycomb layer sequentially on the cover, with the honeycomb holes of adjacent honeycomb layers aligned with each other, thereby enhancing structural protection performance, effectively reducing damage to the explosion-proof structure from external impacts during transportation or transshipment, and preventing battery failure due to accidental breakage.

[0077] Meanwhile, since each honeycomb layer is set up one by one, during the explosion process, firstly, each honeycomb layer can form a multi-level protection in sequence, so that it explodes step by step when the pressure is abnormal; secondly, the honeycomb holes of each layer can be aligned with each other to form multiple independent pressure relief channels, thus forming multiple independent pressure relief positions on the lithium battery cover. In this way, it avoids the lithium battery cover from directly forming a large area of ​​pressure relief opening when the pressure is abnormal, preventing excessive exposure of the battery cell and significantly reducing the risk of fire.

[0078] In addition, the use of cellular modules can improve the structural strength of the lithium battery cover while effectively reducing the overall weight of the lithium battery. This is especially important when lithium batteries need to be assembled into lithium battery packs, as it can greatly ensure the lightweight design of the lithium battery packs.

[0079] The present invention has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to the present invention. Furthermore, it is understood that the steps in the method of the present invention embodiments can be adjusted, combined, and deleted according to actual needs, and the modules in the device of the present invention embodiments can be combined, divided, and deleted according to actual needs.

[0080] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A lithium battery cover, characterized in that, include: A base plate (1) is provided with a through window (11), and a plurality of horizontal bars (12) are provided on the through window (11), one of which is provided with a first mounting hole (13); The upper cover (2) is disposed on the base plate (1) and the upper cover (2) is provided with a second mounting hole (21); and A honeycomb assembly (3) is provided with a third mounting hole (32). The honeycomb assembly (3) includes at least two honeycomb layers (31). Each honeycomb layer (31) is stacked one by one on the upper cover (2), and the honeycomb holes (311) of two adjacent honeycomb layers (31) are aligned with each other. Each honeycomb layer (31) is located between the upper cover (2) and the bottom plate (1). The third mounting hole (32) penetrates each of the honeycomb layers (31), and the two ends of the third mounting hole (32) are respectively aligned with the first mounting hole (13) and the second mounting hole (21).

2. The lithium battery cover plate according to claim 1, characterized in that, Each of the aforementioned honeycomb pores (311) has a peripheral wall hydrophobic coating (312) on its pore wall; and / or The honeycomb layer (31) abuts against the base plate (1), thereby each honeycomb hole (311) defines a plurality of pressure relief zones (14) on the base plate (1), and the bottom of the pressure relief zone (14) is provided with a bottom wall hydrophobic coating (141).

3. The lithium battery cover plate according to claim 1 or 2, characterized in that, The honeycomb holes (311) are hexagonal holes, square holes, or triangular holes.

4. The lithium battery cover plate according to claim 3, characterized in that, The diameter of the honeycomb pores (311) is 0.16 mm to 1.12 mm; and / or The thickness of the cellular component (3) is 0.23 mm to 2.37 mm.

5. The lithium battery cover plate according to claim 1, characterized in that, One of the honeycomb layers (31) is 3D printed and disposed on the top cover (2), and the other honeycomb layers (31) are 3D printed one by one.

6. The lithium battery cover plate according to claim 1, characterized in that, One of the honeycomb layers (31) is integrally formed or welded to the upper cover (2), and the other honeycomb layers (31) are welded one by one.

7. The lithium battery cover plate according to claim 1, characterized in that, The lithium battery cover also includes two poles (4), and two clearance holes are opened on the honeycomb assembly (3). The clearance holes penetrate each of the honeycomb layers (31). Each pole (4) is set on the base plate (1). The two poles (4) are inserted into the two clearance holes one by one, and each pole (4) passes through the top cover (2).

8. The lithium battery cover plate according to claim 1, characterized in that, A sealing gap (5) is provided between the periphery of the base plate (1) and the periphery of the top cover (2), and a sealing ring is provided in the sealing gap (5).

9. A lithium battery, characterized in that, The lithium battery includes a casing (30), a battery cell (40), and a lithium battery cover plate (10) as described in any one of claims 1 to 8. The lithium battery cover plate (10) is disposed on the casing (30), and the casing (30) and the lithium battery cover plate (10) together enclose a storage cavity (50). The battery cell (40) is disposed in the storage cavity (50).

10. The lithium battery according to claim 9, characterized in that, The lithium battery also includes a sealing unit (60), which passes through the first mounting hole (13), the second mounting hole (21) and the third mounting hole (32).

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