Battery casing and battery

Abstract

This utility model discloses a battery casing and a battery, relating to the field of battery technology. The battery casing includes a casing body, terminals, and an insulating assembly. The casing body has mounting holes through which the terminals pass. The insulating assembly insulates the terminals and the casing body. Each terminal includes a column and a plate disposed at the end of the column facing the battery cell. The insulating assembly includes an insulating ring, which includes an insulating cylinder and a first insulating ring plate. The first insulating ring plate is connected to the insulating cylinder, which is sleeved on the column. The first insulating ring plate is located between the casing body and the plate, and the surface of the first insulating ring plate facing the casing body or plate has an annular protrusion that seals against the casing body or plate. The elastic deformation of the annular protrusion compensates for gaps caused by thermal expansion and contraction, effectively solving the sealing failure problem caused by differences in material expansion coefficients at the terminals. This provides advantages such as improved sealing reliability, prevention of leakage, adaptability to extreme temperature environments, extended battery life, and enhanced safety.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and in particular relates to a battery casing and a battery. Background Technology

[0002] Lithium-ion batteries are widely used in consumer electronics due to their high energy density. However, when used in extreme hot and cold environments, the terminals are prone to sealing failure due to thermal expansion and contraction, leading to electrolyte leakage. This is particularly true at the positive terminal, where the significant difference in thermal expansion coefficients between the metal and insulating materials can create tiny gaps during temperature changes, resulting in leakage. This not only affects the battery's performance but can also pose safety hazards. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a battery casing and battery, which addresses the problem of leakage at the terminals of existing battery casings.

[0004] To address the aforementioned issues, this utility model provides a battery casing, comprising a casing body, terminals, and an insulating assembly. The casing body has mounting holes, through which the terminals pass. The insulating assembly insulates the terminals and the casing body. The terminals include a column and a plate disposed at one end of the column near the battery cell. The insulating assembly includes an insulating ring, which includes an insulating cylinder and a first insulating ring plate. The first insulating ring plate is connected to the insulating cylinder, which is sleeved on the column. The first insulating ring plate is located between the casing body and the plate, and the surface of the first insulating ring plate facing the casing body or the plate has at least one annular protrusion that seals against the casing body or the plate.

[0005] Furthermore, this application also proposes that the thickness of the first insulating ring plate is T, the height of the annular protrusion is H, the width of the annular protrusion is W, and 0.01 < T·W < 8H.

[0006] Furthermore, this application also proposes that the thickness of the first insulating ring plate is T, the height of the annular protrusion is H, and H≤0.2T.

[0007] Furthermore, this application also proposes that the surface of the first insulating ring plate facing the shell body or the plate body is provided with at least two annular protrusions.

[0008] Furthermore, this application also proposes that the surface of the first insulating ring plate facing the shell body or the plate body is provided with a first annular protrusion and a second annular protrusion from the inside to the outside, the height of the first annular protrusion is H1, the height of the second annular protrusion is H2, and H1≤H2.

[0009] Furthermore, this application also proposes that the insulating assembly further includes a second insulating ring plate, with the end of the pole away from the cell riveted to form a riveting plate, and the second insulating ring plate disposed between the riveting plate and the housing body.

[0010] Furthermore, this application also proposes that the battery casing further includes a gasket disposed between the riveting plate and the second insulating ring plate.

[0011] Furthermore, this application also proposes that the shell body includes a shell cavity and a shell cover, the shell cavity forming a receiving cavity, the shell cover sealingly covering the opening of the shell cavity, and the mounting hole being formed on the side wall of the shell cavity.

[0012] Furthermore, this application also proposes that the side wall of the cavity is provided with a liquid injection hole, and the battery housing also includes a seal for sealing the liquid injection hole.

[0013] Furthermore, this application also proposes that the insulating component is a perfluoroalkoxy resin insulating component.

[0014] On the other hand, this utility model embodiment provides a battery, including a battery cell and the aforementioned battery casing, wherein the battery cell is installed inside the casing body and is electrically connected to the terminals.

[0015] The battery casing and battery provided in this embodiment of the present invention have at least the following advantages compared with the prior art: by setting an annular protrusion on the first insulating ring plate and forming a sealed contact with the casing body or the electrode plate, the elastic deformation of the annular protrusion is used to compensate for the gap caused by thermal expansion and contraction, which effectively solves the problem of sealing failure caused by the difference in the coefficient of thermal expansion of the electrode, and has the advantages of improving sealing reliability and preventing leakage, thereby extending battery life and improving safety. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an exploded view of the battery casing provided in one embodiment of the present invention; Figure 2 This is a partial cross-sectional view of the battery casing provided in one embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the insulating ring of the battery casing provided in one embodiment of the present invention. Figure 1 ; Figure 4This is a schematic diagram of the structure of the insulating ring of the battery casing provided in one embodiment of the present invention. Figure 2 .

[0018] The reference numerals in the accompanying drawings are as follows: 100-Battery casing, 110-Casing body, 111-Mounting hole, 112-Casing cavity, 113-Casing cover, 114-Injection hole, 120-Terminal post, 121-Post, 122-Plate, 123-Riveting plate, 130-Insulating ring, 131-Insulating cylinder, 132-First insulating ring plate, 133-Annular protrusion, 134-Second insulating ring plate, 140-Washer, 150-Seal. Detailed Implementation

[0019] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] In existing technologies, lithium-ion batteries are widely used in consumer electronics. However, in extreme environments with alternating hot and cold temperatures, micro-gaps can easily form at the connection between the battery terminals and the casing due to thermal expansion and contraction, leading to electrolyte leakage. Traditional sealing structures often use planar insulating gaskets, whose rigid contact cannot compensate for dimensional fluctuations caused by temperature changes, thus limiting sealing reliability. For example, at high temperatures, the difference in the coefficients of thermal expansion between the metal terminals and the casing causes a decrease in contact pressure; at low temperatures and during contraction, the insulating material's insufficient rebound fails to fill the gaps, creating leakage channels.

[0023] To address the aforementioned issues, a sealing structure capable of dynamically adapting to temperature changes needs to be designed. Analysis revealed that existing planar insulating gaskets cannot effectively absorb deformation stress, necessitating the introduction of a structure with elastic compensation capabilities. Further consideration was given to incorporating raised features on the surface of the insulating ring 130, utilizing the material's compressive deformation characteristics to continuously provide contact pressure during thermal expansion and contraction. Simultaneously, the assembly relationship between the pole 120 and the insulating ring 130 needs optimization, dispersing stress through multi-layered sealing interfaces to prevent localized overload leading to seal failure.

[0024] Therefore, please refer to Figures 1 to 4 This application proposes a battery casing 100 including a casing body 110, terminals 120, and an insulating assembly. The casing body 110 has a mounting hole 111, through which the terminals 120 pass. The insulating assembly is used to insulate the terminals 120 and the casing body 110. The terminals 120 include a column 121 and a plate 122 disposed at one end of the column 121 near the battery cell. The insulating assembly includes an insulating ring 130, which includes an insulating cylinder 131 and a first insulating ring plate 132. The first insulating ring plate 132 is connected to the insulating cylinder 131, and the insulating cylinder 131 is sleeved on the column 121. The first insulating ring plate 132 is located between the casing body 110 and the plate 122, and the surface of the first insulating ring plate 132 facing the casing body 110 or the plate 122 has an annular protrusion 133, which seals against the casing body 110 or the plate 122.

[0025] The insulating cylinder 131 refers to the tubular insulating component that wraps around the column 121 of the pole post 120. Specifically, it can be made of injection-molded perfluoroalkoxy resin (PFA). Perfluoroalkoxy resin belongs to the fluoroplastics family and is a modified material of PTFE (polytetrafluoroethylene). Its core characteristics are that it retains the corrosion resistance and high-temperature resistance of PTFE, while also possessing the advantage of melt processing. Its inner diameter is slightly smaller than the outer diameter of the column 121 to ensure an interference fit. The first insulating ring plate 132 refers to the annular flat plate structure connecting the insulating cylinder 131. Specifically, it can be integrally molded with the insulating cylinder 131, with a thickness controlled within the range of 0.2-0.4 mm to balance mechanical strength and deformation capacity. The annular protrusion 133 refers to a strip-shaped raised structure that extends continuously along the circumference. Specifically, it can adopt a semi-circular or trapezoidal cross-section design, with a height of 0.05-0.1 mm. It is formed on the surface of the insulating ring 130 plate through a molding process, and undergoes elastic deformation under pressure to fill the assembly gap.

[0026] Specifically, when the pole post 120 is inserted into the housing body 110 through the mounting hole 111, the insulating cylinder 131 tightly wraps around the pole post 121 to form a radial seal. The first insulating ring plate 132 is clamped between the housing body 110 and the plate 122, and the annular protrusion 133 on its surface undergoes compression deformation under the assembly preload force to form an annular sealing band. Under temperature change conditions, when the metal housing and the pole post 120 undergo differential expansion, the elastic restoring force of the annular protrusion 133 continuously maintains the contact pressure of the sealing interface. For example, when the housing expands due to high temperature, the height of the protrusion decreases but the contact area increases; when the housing contracts at low temperature, the protrusion rebounds to compensate for the gap change, and the dual action ensures the reliability of the seal.

[0027] Compared to existing technologies, traditional planar insulating gaskets rely solely on bolt preload to maintain a static seal. This solution, however, utilizes the dynamic deformation characteristics of the annular protrusion 133 to actively compensate for dimensional fluctuations within a certain range. In existing technologies, single-layer sealing interfaces are prone to creep failure due to stress concentration. This solution forms a radial sealing structure through the insulating cylinder 131 and an axial sealing structure through the first insulating ring plate 132, distributing contact stress across multiple sealing surfaces. This reduces the pressure per unit area by approximately 30%-50%, significantly improving long-term sealing stability.

[0028] Through the above technical solution, this application effectively solves the problem of electrolyte leakage at the battery terminal 120 under extreme temperatures. The elastic deformation characteristics of the annular protrusion 133 can automatically adjust the sealing contact pressure and compensate for dimensional changes caused by differences in the thermal expansion coefficients of materials. The composite sealing structure establishes multiple sealing barriers in both the axial and radial directions, maintaining the integrity of the sealing interface and preventing electrolyte leakage even under severe temperature changes ranging from -40℃ to 85℃.

[0029] Experiments were conducted using a battery with the battery casing 100 provided in this application and a battery with a conventional battery casing. The experimental data are as follows: The high-temperature and high-humidity test method and conditions are as follows: The battery is charged to 4.48V using constant current and constant voltage, and the voltage and internal resistance are recorded. The surface of the battery terminals is photographed to observe leakage. The battery is then transferred to a high-temperature and high-humidity constant temperature chamber at 60℃ and 90%RH. Voltage, internal resistance, and the surface of the battery terminals are recorded at 500H, 700H, and 1000H, respectively, and leakage is observed by photographing the surface of the battery terminals. Under the same test conditions, leakage is observed under a 50x microscope.

[0030] The test results for batteries using conventional battery casings are as follows: Summary: After 500 hours of high temperature and high humidity testing, 8.3% of the samples leaked liquid; after 700 hours, 41.6% of the samples leaked liquid; and after 1000 hours, 75% of the samples leaked liquid.

[0031] The test results of the battery using the battery casing provided in this application are as follows: Summary: After 500 hours of high temperature and high humidity testing, 0% of the samples leaked liquid; after 700 hours, 8.3% of the samples leaked liquid; and after 1000 hours, 16.6% of the samples leaked liquid.

[0032] Experimental Summary: Using the battery casing provided in this application, the leakage rate of the battery decreased and the yield increased under high temperature and high humidity test conditions.

[0033] Please see Figures 3 to 4 This application further proposes that the thickness of the first insulating ring plate 132 is T, the height of the annular protrusion 133 is H, the width of the annular protrusion 133 is W, and 0.01 < T·W < 8H.

[0034] The thickness T of the first insulating ring plate 132 refers to the vertical dimension of the insulating ring plate 130. Specifically, it can be injection molded from perfluoroalkoxy resin (PFA), and its thickness must meet the requirements for insulation and support. The height H of the annular protrusion 133 refers to the vertical distance between the top of the protrusion and the base surface. It can be formed through a molding process and is used to generate elastic deformation under pressure to achieve a seal. The width W of the annular protrusion 133 refers to the radial extension dimension of the protrusion. It can be controlled by adjusting the mold groove width, and its product with the thickness T directly affects the contact area and pressure distribution.

[0035] Specifically, by controlling the product of T and W within the range of greater than 0.01 and less than 8H, sufficient contact area can be ensured between the annular protrusion 133 and adjacent components, while avoiding material deformation due to excessive contact pressure. For example, when T is 0.5 mm and W is 0.3 mm, T·W is 0.15. If H is 0.1 mm, then the constraint condition T·W < 8H is satisfied. This proportional relationship allows the annular protrusion 133 to compensate for the deformation difference between the shell body 110 and the pole post 120 under alternating hot and cold environments, while maintaining a stable sealing interface.

[0036] Through the above technical solution, this application can effectively suppress the gap change between the electrode post 120 and the shell body 110 under alternating hot and cold operating conditions, preventing electrolyte from seeping out from the interface of the insulating ring 130. The elastic deformation of the annular protrusion 133 and the contact pressure are balanced through parameter optimization, avoiding the fatigue cracking of the sealing material caused by local stress concentration in the prior art.

[0037] Please see Figures 3 to 4 This application further proposes that the thickness of the first insulating ring plate 132 is T, the height of the annular protrusion 133 is H, and H≤0.2T.

[0038] The thickness of the first insulating ring plate 132 refers to the overall dimension of the insulating ring plate 130 in the direction perpendicular to the contact between the plate body 122 and the shell body 110. Specifically, the thickness can be controlled by injection molding process, and precise processing can be achieved by adjusting the mold parameters. This thickness provides basic support strength for the annular protrusion 133, preventing structural deformation due to external pressure.

[0039] The height of the annular protrusion 133 refers to the vertical distance between the top of the protrusion and the surface of the insulating ring 130 plate. Specifically, the protrusion can be engraved to a specific height on the mold surface. The height is limited to no more than one-fifth of the thickness, so that the protrusion can produce elastic deformation to achieve sealing when under pressure, without causing the overall structure of the insulating ring 130 plate to fail due to excessive compression.

[0040] Specifically, when the relative displacement between the pole post 120 and the shell body 110 occurs due to temperature changes, the annular protrusion 133 undergoes controllable deformation under the constraint of its thickness-to-height ratio. For example, during thermal expansion, the protrusion extends laterally after being compressed, forming a continuous contact surface with the shell body 110 or the plate 122; during cooling and contraction, the protrusion maintains the contact pressure by relying on elastic restoring force. This proportional relationship ensures that the protrusion deformation matches the load-bearing capacity of the insulating ring 130 plate, avoiding local stress concentration or breakage of the insulating ring 130 plate due to excessive protrusion height.

[0041] Compared to existing technologies, the height of the annular protrusion 133 in existing solutions is usually not limited by the thickness ratio, which can easily lead to uneven distribution of sealing pressure due to excessive protrusion, or plastic deformation after repeated deformation. This solution constrains the ratio of height to thickness, ensuring that the protrusion remains within the elastic deformation range during sealing contact, while also guaranteeing the overall structural stability of the insulating ring 130 plate.

[0042] Through the above technical solution, in a hot and cold alternating environment, the annular protrusion 133 can adapt to the displacement changes between the electrode post 120 and the shell body 110, and maintain the tight contact of the sealing interface through controllable deformation, thereby effectively preventing electrolyte leakage from the electrode post 120 installation position.

[0043] Please see Figure 4 This application further proposes that the surface of the first insulating ring plate 132 facing the shell body 110 or plate 122 is provided with at least two annular protrusions 133.

[0044] The first insulating ring plate 132 refers to the ring-shaped insulating component connected to the insulating cylinder 131, located between the plate 122 of the shell body 110 and the pole post 120. Specifically, it can be injection molded from perfluoroalkoxy resin (PFA) to block the conductive path between the pole post 120 and the shell body 110.

[0045] Among them, the annular protrusion 133 refers to a protruding structure that extends continuously along the circumferential direction of the surface of the first insulating ring plate 132. Specifically, it can be an annular rib integrally formed with the first insulating ring plate 132, which forms a squeezing contact with the shell body 110 or the plate body 122 through elastic deformation, in order to enhance the contact pressure of the sealing interface.

[0046] Specifically, when at least two annular protrusions 133 are provided on the surface of the first insulating ring plate 132 facing the shell body 110 or plate 122, the multiple annular protrusions 133 are radially spaced to form multiple sealing defenses. When the electrode post 120 and the shell body 110 undergo relative displacement due to temperature changes, the multiple annular protrusions 133 compensate for the gaps in the contact surfaces through elastic deformation, preventing electrolyte leakage due to single-point seal failure. For example, in alternating hot and cold environments, when the first insulating ring plate 132 expands due to heat, the outer annular protrusions 133 are preferentially deformed by pressure, while the inner annular protrusions 133 maintain the initial sealing state; when the temperature decreases and the material shrinks, the inner annular protrusions 133 continue to provide residual sealing force, thereby achieving a continuous sealing effect under dynamic environments.

[0047] Compared to existing technologies, traditional solutions using only a single annular protrusion 133 for sealing are prone to seal failure due to material creep or stress relaxation under extreme temperature fluctuations. This solution, through a multi-annular protrusion 133 staged sealing design, reduces stress concentration at single-point seals. Furthermore, by utilizing the redundancy of the multi-protrusion structure, it maintains overall sealing performance even if any single seal fails.

[0048] Through the above technical solution, this application can significantly improve the reliability of the sealing interface between the electrode post 120 and the shell body 110. Under alternating hot and cold environments, the synergistic effect of multiple sealing structures can effectively suppress electrolyte leakage caused by material deformation and extend the battery's service life under extreme conditions.

[0049] Please see Figure 4 This application further proposes that the surface of the first insulating ring plate 132 facing the shell body 110 or plate 122 is provided with a first annular protrusion 133 and a second annular protrusion 133 from the inside to the outside, the height of the first annular protrusion 133 is H1, the height of the second annular protrusion 133 is H2, and H1≤H2.

[0050] The first annular protrusion 133 refers to an annular protrusion structure located inside the insulating ring 130 plate. It can be formed on the surface of the insulating ring 130 plate by molding or machining, and is used to preferentially deform to fill the gap during sealing contact. The second annular protrusion 133 refers to an annular protrusion structure located outside the insulating ring 130 plate, and can be achieved using the same machining method as the first annular protrusion 133. It is used to provide secondary sealing support when the sealing surface is under pressure. The limitation of H1≤H2 allows the outer annular protrusion 133 to withstand greater contact pressure during compression, thereby forming a stepped sealing effect.

[0051] Specifically, during the assembly of the pole post 120 and the housing body 110, the first annular protrusion 133, due to its lower height, preferentially contacts the housing body 110 or the plate 122, filling the microscopic uneven areas of the contact surface through elastic deformation. As the assembly pressure increases, the second annular protrusion 133 subsequently abuts against the contact surface; its higher height design allows for greater compression in this area, thus forming a pressure gradient from the inside out at the sealing interface. This dual-sealing structure, when temperature changes cause material expansion or contraction, can coordinate deformation through protrusions of different heights, avoiding seal failure caused by excessive compression of a single protrusion.

[0052] Compared to existing technologies, traditional solutions typically employ a single annular protrusion (133) or multiple protrusions of equal height, which can easily lead to insufficient local sealing pressure due to differences in material deformation under extreme temperatures. This solution, by setting protrusions with increasing height from the inside out, makes the pressure distribution at the sealing interface more adaptable to the deformation direction caused by thermal expansion and contraction, especially forming a stronger sealing retention force in the outer region.

[0053] Through the above technical solution, this application can effectively cope with the deformation difference between the terminal post 120 and the shell under alternating hot and cold environments, maintain a stable interface contact pressure through a stepped sealing structure, prevent electrolyte leakage from the installation position of the terminal post 120, and improve the sealing reliability of the battery under extreme operating conditions.

[0054] Please see Figures 1 to 2 This application further proposes that the insulation assembly also includes a second insulating ring plate 134, and the end of the pole post 120 away from the battery cell is riveted to form a riveting plate 123, with the second insulating ring plate 134 disposed between the riveting plate 123 and the housing body 110.

[0055] The riveting plate 123 refers to the plate-like structure formed by riveting the electrode post 120 through a riveting process. It can be made of copper or aluminum through a stamping and riveting process, and is used to fix the connection position between the electrode post 120 and the housing body 110. The second insulating ring plate 134 refers to the annular insulating component disposed between the riveting plate 123 and the housing body 110. It can be made of perfluoroalkoxy resin (PFA) and is used to block the conductive path between the riveting plate 123 and the housing body 110. The housing body 110 refers to the metal housing that houses the battery cell. It can be made of aluminum alloy or stainless steel through a stamping process and is used to provide structural support and sealing protection.

[0056] Specifically, after a riveting process is used to form a riveting plate 123 at the end of the electrode post 120 furthest from the battery cell, a second insulating ring plate 134 is clamped between the riveting plate 123 and the housing body 110. The riveting plate 123 is fixedly connected to the housing body 110 by mechanical pressure. During this process, the second insulating ring plate 134 is compressed, and its insulating material fills the gap between the riveting plate 123 and the housing body 110, forming a physical isolation layer. In this process, the mechanical force generated by riveting makes the second insulating ring plate 134 and the housing body 110 form a tight contact, thereby establishing a double insulation barrier between the electrode post 120 and the housing.

[0057] Compared to existing technologies, which typically only have a single-layer insulation structure between the pole post 120 and the housing and do not employ riveting for fixation, gaps can form due to material deformation under alternating hot and cold environments. This solution, through a mechanically fixed structure formed by riveting, combined with the compressive deformation characteristics of the second insulating ring plate 134, can maintain stable contact pressure under temperature changes, preventing leakage channels caused by material shrinkage.

[0058] Through the above technical solution, this application effectively enhances the insulation and sealing performance between the electrode post 120 and the casing, preventing electrolyte leakage from the riveting area. The synergistic effect of the second insulating ring plate 134 and the riveting structure enables the battery to maintain the stability of the interface contact under extreme temperature environments, solving the sealing failure problem caused by thermal expansion and contraction of traditional single-layer insulation structures.

[0059] Please see Figures 1 to 2 This application further proposes that the battery housing 100 also includes a gasket, which is disposed between the riveting plate 123 and the second insulating ring plate 134.

[0060] Among them, the washer refers to a ring-shaped component with elastic deformation capability, which can be made of metal or engineering plastic materials, and is used to distribute riveting pressure and buffer the impact of mechanical vibration on the second insulating ring plate 134.

[0061] Among them, the riveting plate 123 refers to the fixed structure formed at the end of the pole post 120 by the riveting process. Specifically, it can be made of aluminum or copper material and is used to form a mechanical connection between the pole post 120 and the shell body 110.

[0062] The second insulating ring plate 134 refers to the insulating component disposed between the riveting plate 123 and the shell body 110. Specifically, it can be made of perfluoroalkoxy resin (PFA) material and is used to block the conductive path between the riveting plate 123 and the shell body 110.

[0063] Specifically, after the end of the electrode post 120 furthest from the battery cell is riveted to form a riveting plate 123, a gasket is placed between the riveting plate 123 and the second insulating ring plate 134. When the riveting plate 123 is subjected to external pressure, the gasket absorbs part of the pressure through elastic deformation, preventing the second insulating ring plate 134 from cracking or deforming due to local stress concentration. At the same time, the planar contact characteristics of the gasket ensure that the riveting force is evenly transmitted to the second insulating ring plate 134, ensuring that the sealing interface between the insulating ring plate 130 and the housing body 110 remains flat, thereby preventing electrolyte from seeping out from the riveting area.

[0064] Compared to existing technologies, in existing technologies, the riveting plate 123 directly contacts the insulating ring 130 plate. The pressure generated during the riveting process can easily cause plastic deformation or cracking of the insulating ring 130 plate, leading to sealing failure. This solution introduces a gasket to convert the mechanical stress originally concentrated on the insulating ring 130 plate into elastic deformation energy, which maintains the stability of the riveting connection and avoids the decrease in sealing performance of the insulating material due to uneven stress.

[0065] Through the above technical solution, this application effectively solves the problem of sealing failure caused by mechanical stress concentration in the riveting area of ​​the pole post 120. The gasket buffers and disperses the riveting force, so that the second insulating ring plate 134 can still maintain an intact sealing interface under extreme temperature changes, thereby preventing electrolyte leakage from the riveting part.

[0066] Please see Figure 1 This application further proposes that the battery housing 100 includes a housing cavity 112 and a housing cover 113. The housing cavity 112 forms a receiving cavity, the housing cover 113 is sealed and covered at the opening of the housing cavity 112, and the mounting hole 111 is formed on the side wall of the housing cavity 112.

[0067] The cavity 112 refers to the container structure that constitutes the main body of the battery casing 100. It can be manufactured using a metal stamping process and is used to house the battery cells and provide mechanical support. The cover 113 is a closed component that mates with the opening of the cavity 112. It can be sealed using laser welding to form a closed internal space for the battery. The mounting hole 111, located on the side wall of the cavity 112, is formed by punching or drilling on the side of the cavity 112, and is used to insert the terminal post 120 while minimizing the space occupied at the top.

[0068] Specifically, the housing 112 and the housing cover 113 adopt a separate structure. After the mounting hole 111 is opened on the side wall of the housing 112, the electrode post 120 can be directly inserted from the side and connected to the battery cell. The housing cover 113 independently seals the opening of the housing 112, so that the mounting position of the electrode post 120 is separated from the sealing surface of the housing, avoiding the sealing integrity of the housing cover 113 due to the assembly stress of the electrode post 120. For example, the mounting hole 111 on the side wall of the housing 112 can be designed as a stepped hole structure, which, together with the insulating ring 130, achieves the fixation and sealing of the electrode post 120.

[0069] Compared to existing technologies, traditional battery casings 100 typically place the mounting holes 111 for the terminals 120 on the top cover 113, causing the sealing surface to overlap with the assembly position of the terminals 120. This can easily lead to leakage due to differences in material deformation under alternating hot and cold environments. This solution relocates the mounting holes 111 to the side wall of the casing cavity 112, creating an independent area for the assembly of the terminals 120 and the sealing of the casing cover 113. This reduces stress interference on the sealing surface, and the split structure facilitates independent adjustment during assembly.

[0070] Through the above technical solution, this application achieves physical isolation between the electrode post 120 installation position and the housing sealing surface, reducing the risk of sealing failure caused by thermal expansion and contraction, while optimizing the internal space layout of the housing and improving the sealing reliability of the battery under extreme temperature environments.

[0071] Please see Figure 1This application further proposes that the side wall of the cavity 112 is provided with a liquid injection hole 114, and the battery housing 100 also includes a sealing element for sealing the liquid injection hole 114.

[0072] The electrolyte injection hole 114 refers to the through hole structure provided on the side wall of the shell cavity 112, which can be realized by mechanical drilling or stamping process, and is used to inject electrolyte during battery assembly.

[0073] The sealing element refers to the sealing component that mates with the injection port 114, and can be made of the same material as the shell cavity 112. In this embodiment, the shell cavity 112 is made of stainless steel, and the sealing element is a stainless steel sheet. After the electrolyte is injected, the sealing element is pressed or screwed into the injection port 114, and then welded to the shell cavity 112 to seal the injection port 114 and prevent electrolyte leakage.

[0074] Specifically, the injection hole 114 is located on the side wall of the shell cavity 112, and its position can avoid the sealing interface between the shell cavity 112 and the shell cover 113, so as to avoid sealing failure due to assembly stress.

[0075] In this embodiment, the inner diameter of the insulating cylinder 131 is D1, and the diameter of the column 121 is D2, where D1 + 0.1 ≤ D2. The column 121 and the inner wall of the insulating cylinder 131 are interference-fitted, facilitating the installation of the positioning insulating ring. The thickness of the first insulating ring plate is 0.2mm-0.4mm, the thickness of the second insulating ring plate is 0.1mm-0.4mm, the thickness of the shell cavity is 0.05mm-0.25mm, and the thickness of the shell cover is 0.03mm-0.15mm. The shell cavity and shell cover are made of alloy metal, preferably stainless steel.

[0076] This application further proposes a battery, including a battery cell and a battery casing 100, wherein the battery cell is installed inside the casing body 110 and is electrically connected to the terminal post 120.

[0077] Here, "cell" refers to the energy storage unit, which can be implemented using lithium-ion cells. Its positive and negative electrode materials are formed into a multi-layer structure through winding or stacking. "Shell body 110" refers to the sealed container used to house the cell, which can be made of stamped metal and has an internal cavity to secure the cell. "Terminal post 120" refers to the conductive connection component, which can be made of copper or aluminum and processed into a columnar structure, forming a conductive path with the cell's electrode tabs through welding or riveting.

[0078] Specifically, the battery cell is assembled within the receiving cavity of the casing 110 and connected to an external circuit via the terminal post 120. The terminal post 120 passes through the mounting hole 111 on the side wall of the casing 110, and the annular protrusion 133 of the insulating ring 130 forms a multi-layered sealing interface between the casing 110 and the terminal post 120. When the battery experiences temperature changes, the elastic deformation of the annular protrusion 133 compensates for the thermal expansion difference between the metal casing and the terminal post 120, preventing electrolyte leakage from the assembly gap. The battery cell tabs are connected to the plate 122 of the terminal post 120 by laser welding to ensure stable current transmission.

[0079] Compared to existing technologies, traditional batteries use only a single-layer sealing ring structure at the terminal post 120, which is prone to gaps due to material shrinkage under alternating hot and cold environments. This solution, by setting multiple annular protrusions 133 on the surface of the insulating ring 130 plate, forms a stepped sealing structure. Even if one protrusion fails due to aging, the remaining protrusions can still maintain the sealing effect. Simultaneously, the sleeve design between the insulating cylinder 131 and the post 121 effectively isolates direct contact between the terminal post 120 and the casing, avoiding the risk of short circuits in metal components.

[0080] Through the above technical solution, this application can effectively solve the leakage problem caused by temperature changes at the electrode post 120. The elastic sealing structure of the annular protrusion 133 can adapt to repeated thermal expansion and contraction within the range of -40℃ to 85℃, ensuring that the battery maintains its airtightness in extreme environments. The redundant design of the multi-layer sealing interface significantly improves the sealing reliability and avoids performance degradation or safety hazards caused by electrolyte leakage.

[0081] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A battery casing, characterized in that, The device includes a housing (110), a terminal post (120), and an insulating assembly. The housing (110) has a mounting hole (111), and the terminal post (120) passes through the mounting hole (111). The insulating assembly is used to insulate the terminal post (120) and the housing (110). The terminal post (120) includes a column (121) and a plate (122) disposed at one end of the column (121) near the cell. The insulating assembly includes an insulating ring (130), which includes an insulating cylinder (131) and a first insulating ring. The first insulating ring plate (132) is connected to the insulating cylinder (131), the insulating cylinder (131) is sleeved on the column (121), the first insulating ring plate (132) is located between the shell body (110) and the plate body (122), and the surface of the first insulating ring plate (132) facing the shell body (110) or the plate body (122) is provided with at least one annular protrusion (133), the annular protrusion (133) is sealed and abutted against the shell body (110) or the plate body (122).

2. The battery casing according to claim 1, characterized in that, The thickness of the first insulating ring plate (132) is T, the height of the annular protrusion (133) is H, the width of the annular protrusion (133) is W, and 0.01 < T·W < 8H.

3. The battery casing according to claim 1, characterized in that, The thickness of the first insulating ring plate (132) is T, and the height of the annular protrusion (133) is H, and H≤0.2T.

4. The battery casing according to claim 1, characterized in that, The surface of the first insulating ring plate (132) facing the shell body (110) or the plate body (122) is provided with at least two of the annular protrusions (133).

5. The battery casing according to claim 4, characterized in that, The surface of the first insulating ring plate (132) facing the shell body (110) or the plate body (122) is provided with a first annular protrusion (133) and a second annular protrusion (133) from the inside to the outside. The height of the first annular protrusion (133) is H1, the height of the second annular protrusion (133) is H2, and H1≤H2.

6. The battery casing according to claim 1, characterized in that, The insulation assembly also includes a second insulating ring (130) plate, and the end of the pole (120) away from the cell is riveted to form a riveting plate (123). The second insulating ring (130) plate is disposed between the riveting plate (123) and the shell body (110).

7. The battery casing according to claim 6, characterized in that, The battery housing (100) also includes a gasket, which is disposed between the riveting plate (123) and the second insulating ring (130) plate.

8. The battery casing according to claim 1, characterized in that, The shell body (110) includes a shell cavity (112) and a shell cover (113). The shell cavity (112) forms a receiving cavity, and the shell cover (113) is sealed and covered at the opening of the shell cavity (112). The mounting hole (111) is opened on the side wall of the shell cavity (112).

9. The battery casing according to claim 8, characterized in that, The side wall of the cavity (112) is also provided with a liquid injection hole (114), and the battery housing (100) also includes a sealing element, which is used to block the liquid injection hole (114).

10. The battery casing according to claim 1, characterized in that, The insulating component is a perfluoroalkoxy resin insulating component.

11. A battery, characterized in that, The battery includes a battery cell and a battery housing (100) as claimed in any one of claims 1 to 10, wherein the battery cell is installed inside the housing body (110) and the battery cell is electrically connected to the terminal (120).

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