Battery cover plate, battery and battery pack

Abstract

The application relates to the technical field of batteries, and provides a battery cover plate, a battery and a battery pack.The battery cover plate comprises a cover plate body provided with a through hole, a sealing plate arranged at the through hole and in sealing connection with the through hole, and a boss arranged on the outer side of the sealing plate in a first direction and extending to the outside of the through hole in the first direction, wherein an end face on the side, away from the cover plate body, of the boss is integrally formed with a plurality of convex ribs with closed contours, and the first direction is the thickness direction of the cover plate body.The battery cover plate has the advantages that the existence of the convex ribs increases the surface area of the outer surface of the boss, and greatly increases the heat dissipation area of the battery cover plate; in the battery charging and discharging process, the generated heat can be quickly conducted and dissipated, the working temperature of the battery is effectively reduced, the battery can be stably adapted to the high-rate fast charging technical scheme, and the structure glue can be coated on the surface of the boss through the design, so that the bonding area of the structure glue and the boss is obviously increased.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery cover, a battery, and a battery pack. Background Technology

[0002] As lithium-ion power batteries develop towards higher power and faster charging rates, the cover plate, as a key component for cell sealing and current conduction, directly affects the battery's heat dissipation performance and structural reliability through its structural design.

[0003] In existing technologies, battery covers mostly adopt a single planar structure and have not been optimized for heat dissipation in fast charging scenarios. As a result, during high-rate charging and discharging, the sealed area of ​​the cover is close to the electrode welding point, and the heat is concentrated and difficult to dissipate. This causes the temperature rise of the outer surface of the battery cell to generally reach 65-75℃, which exceeds the safe operating temperature range of the battery, and is usually required to be ≤60℃.

[0004] In addition, the existing cover plate and pack cooling components lack a compatible design, the cooling components cannot fit tightly into the heat dissipation area of ​​the cover plate, the heat exchange path is long, the heat dissipation efficiency is low, which restricts the improvement of battery fast charging capability. Summary of the Invention

[0005] This invention provides a battery cover, a battery, and a battery pack to address the shortcomings of existing lithium-ion power battery covers, such as poor heat dissipation and poor compatibility with cooling components, thereby achieving effective temperature control and improved fast charging performance during battery fast charging.

[0006] This invention provides a battery cover, comprising: The cover plate body has through holes; A sealing plate is disposed at the through hole, and the sealing plate is sealed to the through hole; A boss is disposed on the outer side of the sealing plate along a first direction, and the boss is adapted to the through hole. The boss extends to the outside of the through hole along the first direction. Multiple closed-profile ribs are integrally formed on the end face of the boss away from the cover plate body. The first direction is the thickness direction of the cover plate body.

[0007] According to the battery cover provided by the present invention, the rib is a closed contour rib having a straight segment and / or an arc segment, including an outer ring rib and a plurality of inner ring ribs, wherein the plurality of inner ring ribs are located in the area enclosed by the outer ring rib.

[0008] The battery cover provided according to the present invention further includes: Positive terminal; The negative terminal and the positive terminal are disposed on the cover plate body on both sides of the through hole along a second direction, the second direction being the length direction of the cover plate body.

[0009] According to the battery cover provided by the present invention, the boss is formed by continuous bending of the sealing plate, the wall thickness T of the boss along the first direction is between 1.5mm and 2.5mm, the inner ring rib and the outer ring rib have the same height, and the relationship between the height h and the wall thickness T of the boss is: 0.2T≤h≤1.0T.

[0010] According to the battery cover provided by the present invention, the outer ring rib and the inner ring rib have the same width, and the width a is between 0.6mm and 2.5mm, and the distance b between two adjacent inner ring ribs is between 1.5mm and 3mm.

[0011] According to the battery cover provided by the present invention, the relationship between the edge distance D between the outer ring rib and the edge of the boss is 0.5T≤D≤2T.

[0012] According to the battery cover provided by the present invention, along a third direction, the total width of all the ribs is n×2a, and the relationship between the total width of all the ribs and the total width W of the boss is: 0.08W≤n×2a≤0.4W, where n is the number of ribs, and the third direction is the width direction of the cover body.

[0013] According to the battery cover provided by the present invention, the relationship between the total area S0 of all the exposed surfaces of the ribs and the total area S of the top surface and the surrounding sides of the boss is: 0.05S≤S0≤0.45S.

[0014] In a second aspect, the present invention also provides a battery, including a housing and a battery cover as described in the first aspect, the battery cover being closed and fixed to the opening end of the housing.

[0015] Thirdly, the present invention also provides a battery pack, comprising: a cooling component and a battery as described in the second aspect, wherein the cooling component is bonded and fixed to the ribs on the battery cover by structural adhesive.

[0016] This invention provides a battery cover plate. A boss is provided on the outer side of the sealing plate, which is adapted to a through hole and extends along the thickness direction of the cover plate body to the outside of the through hole. Simultaneously, a rib is integrally formed on the end face of the boss. The presence of the rib increases the surface area of ​​the outer surface of the boss and significantly increases the heat dissipation area of ​​the battery cover plate. During battery charging and discharging, it can quickly conduct and dissipate the heat generated by the system, effectively reducing the battery operating temperature. Experimental verification shows that this structure can control the outer surface temperature rise of the battery cell during cycling to below 60°C, avoiding the impact of high temperature on fast charging performance. This allows the battery to stably adapt to high-rate fast charging technology, improving fast charging capability. The bonding area between the structural adhesive and the boss is increased by approximately 10%-25% compared to existing technologies. Furthermore, this design allows for the application of structural adhesive to the boss surface for connection with other components, such as cooling components of the battery pack. This significantly increases the bonding area ratio, enhancing bonding strength and improving overall battery safety and reliability. It also provides suitable space for the arrangement of cooling components within the battery pack during subsequent installation processes. By directly contacting the cooling components with the raised ribs, the cooling components are tightly fitted to the heat dissipation structure of the cover plate, further strengthening the cooling effect and ensuring stable battery operation under prolonged high-load conditions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a front view of the battery cover provided in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the sealing plate and boss provided in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of a battery provided by the present invention.

[0021] Figure 4 for Figure 1 A sectional view along the AA direction.

[0022] Figure label: 1. Cover plate body; 2. Sealing plate; 3. Boss; 4. Outer ring rib; 5. Inner ring rib; 6. Positive terminal; 7. Negative terminal; 8. Explosion-proof valve; 9. Housing. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0024] The following is combined with Figures 1-4 This invention describes a battery cover, a battery, and a battery pack.

[0025] like Figure 1 As shown, an embodiment of the present invention provides a battery cover plate, including: a cover plate body 1, a sealing plate 2, and a boss 3. The cover plate body 1 has a through hole for serving as a welding channel between the electrode tab and the connecting piece on the inner side of the cover plate; the sealing plate 2 is disposed at the through hole and is sealed to the through hole; the boss 3 is disposed on the outer side of the sealing plate 2 along a first direction and extends to the outside of the through hole along the first direction, which is the thickness direction of the cover plate body 1.

[0026] On the end face of the boss 3 facing away from the cover plate body 1, multiple closed-profile ribs are integrally formed. The closed-profile structure avoids heat dissipation blind spots, ensuring that heat is evenly dissipated in all areas of the boss 3, and preventing material aging or performance degradation caused by local high temperature. Moreover, the integral forming design of the ribs and the boss 3 eliminates the need for additional assembly steps, simplifying the production process, reducing manufacturing costs, and improving structural reliability.

[0027] As can be seen from the above scheme, the present invention provides a boss 3 on the outer side of the sealing plate 2. The boss 3 is adapted to the through hole and extends to the outside of the through hole along the thickness direction of the cover plate body 1. At the same time, the rib is integrally formed on the end face of the boss 3. The presence of the rib increases the surface area of ​​the outer surface of the boss 3 and also significantly increases the heat dissipation area of ​​the battery cover plate. During the battery charging and discharging process, it can quickly conduct and dissipate the heat generated by the system, effectively reducing the battery operating temperature. Experimental verification shows that using this structure can control the outer surface temperature rise of the cell during the cycle to below 60°C (the existing technology is usually 65-75°C), avoiding the impact of high temperature on fast charging performance, and enabling the battery to stably adapt to high-rate fast charging technology. This technical solution improves fast charging capability by approximately 10%-25%. Furthermore, this design allows for the application of structural adhesive to the surface of the boss 3 for connection with other components, such as cooling components of the battery pack. This significantly increases the bonding area between the structural adhesive and the boss 3, by 3%-25% compared to existing technologies. This enhances bonding strength and improves the overall safety and reliability of the battery. It also provides suitable space for the arrangement of cooling components within the battery pack during subsequent battery pack installation processes. By directly contacting the cooling components with the ribs, the cooling components are tightly fitted to the heat dissipation structure of the cover plate, further enhancing the cooling effect and ensuring stable battery operation under long-term high-load conditions.

[0028] In some embodiments, the through hole can be a rectangular hole and is located in the middle of the cover plate body 1, serving as a welding channel between the electrode lug and the connecting piece on the inner side of the cover plate; the sealing plate 2 is located at the through hole and is sealed to the through hole, such as the edge of the sealing plate 2 being connected to the end of the through hole by laser welding, the surface area of ​​the sealing plate 2 being larger than the cross-sectional area of ​​the through hole, used to seal the through hole after the electrode lug and the connecting piece are welded, ensuring the sealing performance of the cover plate body 1; the boss 2 is located on the outer side of the sealing plate 2 and can be integrally formed with the sealing plate 2.

[0029] In this embodiment, the rib is a closed-profile rib with straight segments and / or arc segments. That is, the shape of the rib can be a closed profile formed by straight segments, or a closed profile formed by arc segments, or a closed profile formed by a combination of straight segments and arc segments. For example, the closed-profile rib can be rectangular, square, circular, racetrack-shaped, etc., and the rib includes an outer ring rib 4 and multiple inner ring ribs 5, with the multiple inner ring ribs 5 located within the area enclosed by the outer ring rib 4. The outer ring rib 4 can clearly define the effective bonding area of ​​the boss 3, and the setting of the rib increases the bonding area ratio between the boss 3 and the structural adhesive by 3%-25%, which can enhance the adhesion of the structural adhesive and prevent the structural adhesive from falling off due to insufficient bonding area.

[0030] With this design, the raised ribs adopt a closed contour design containing straight segments and / or arc segments, and the outer ring raised ribs 4 and the multiple inner ring raised ribs 5 form a multi-layer distribution structure. Compared with ordinary non-closed or single raised ribs, it can more evenly cover the end face of the raised platform 3, greatly increasing the heat dissipation area. During the charging and discharging process of the battery, heat can be quickly conducted and diffused through the three-dimensional heat dissipation path of the outer ring and inner ring raised ribs 5, effectively controlling the temperature rise of the outer surface of the cell during cycling to below 60°C, which is lower than the temperature range of 65-75°C in the existing technology. This provides a stable low-temperature environment for high-rate fast charging and improves the battery's fast charging capability.

[0031] In some embodiments, the outer ring rib 4 and the inner ring rib 5 have the same shape, which can be rectangular or racetrack-shaped. The outer ring rib 4 extends along the second direction, and the multiple inner ring ribs 5 extend along the third direction. The axis of the inner ring rib 5 along the third direction is perpendicular to the axis of the outer ring rib 4 along the second direction. The second direction is the length direction of the boss 3, and the third direction is the width direction of the boss 3.

[0032] This design, by extending the outer ring ribs 4 along a specific direction such as the length of the boss 3 to form a closed contour, improves the rigid support of the end face of the boss 3. Multiple inner ring ribs 5 are located within the enclosed area of ​​the outer ring ribs 4 and extend along the width of the boss 3, forming a crisscross structure with the outer ring ribs 4. This further disperses stress and enhances the overall structural strength of the sealing plate 2 and the boss 3. This design effectively solves problems such as insufficient strength and poor flatness that are common in long cell covers, reduces the risk of cracking of the boss 3 and seal failure during battery use, extends the lifespan of the cell, and ensures stable battery operation under complex conditions such as vibration and impact.

[0033] In other embodiments, both the outer ring rib 4 and the inner ring rib 5 are circular. In this case, the boss 3 can have a square cross-section, and multiple inner ring ribs 5 can be arranged layer by layer and concentrically within the area of ​​the outer ring rib 4.

[0034] In this embodiment, the explosion-proof valve 8 is mounted on the boss 3, and the multiple inner ring ribs 5 and the explosion-proof valve 8 are all located within the area enclosed by the outer ring ribs 4, and all the inner ring ribs 5 are located on the outer periphery of the explosion-proof valve 8, such as... Figure 1 , Figure 2 As shown, along the length of the boss 3, multiple superimposed inner ring ribs 5 are provided on both sides of the explosion-proof valve 8; and when both the outer ring rib 4 and the inner ring rib 5 are circular, the explosion-proof valve 8 can be set in the innermost inner ring rib 5.

[0035] With this configuration, the area enclosed by the outer ring ribs 4 accommodates the explosion-proof valve 8. The rigid frame formed by the outer ring ribs 4 provides physical protection for the explosion-proof valve 8, preventing damage from external collisions or foreign objects, and preventing the explosion-proof valve 8 from failing its safety function due to external force damage. At the same time, it will not affect the normal opening of the explosion-proof valve 8 when the internal pressure of the battery is too high, thus ensuring battery safety. By providing multiple overlapping inner ring ribs 5 along the length of the boss 3 on both sides of the explosion-proof valve 8, the ribs form a dense and uniform heat dissipation structure around the explosion-proof valve 8. This not only expands the heat dissipation area of ​​the outer surface of the boss 3, but also specifically removes the heat generated around the explosion-proof valve 8 due to battery charging and discharging, preventing localized high temperatures in the explosion-proof valve 8 area. It also evenly distributes the stress on the surface of the boss 3 to each rib, preventing local structural weakness and stress concentration caused by the opening of the explosion-proof valve 8, reducing the risk of cracking and deformation of the boss 3. In addition, when both the outer and inner ring ribs 5 are circular, the explosion-proof valve 8 is located in the innermost ring rib 5. The annular heat dissipation path of the circular rib can conduct heat more evenly, further optimizing heat dissipation efficiency and preventing heat accumulation around the explosion-proof valve 8.

[0036] It should be noted that the height of the raised rib on the boss 3 is greater than the height of the explosion-proof valve 8. Thus, through the reasonable layout of the explosion-proof valve 8 and the raised rib, a suitable space is reserved for the bonding and fixing of the cooling components inside the battery pack. When the cooling components are bonded to the raised rib with structural adhesive, they can avoid the area of ​​the explosion-proof valve 8, which does not affect the function of the explosion-proof valve 8, and can fit tightly with the raised rib. The cooling effect is transferred to the inside of the battery through the heat dissipation path of the raised rib. In particular, the superimposed inner ring raised ribs 5 on both sides of the explosion-proof valve 8 can provide more contact points for the cooling components, enhance the heat exchange efficiency between the cooling components and the boss 3, further reduce the battery operating temperature, and ensure the stable operation of the battery under long-term high-load fast charging conditions.

[0037] In this embodiment, it also includes: a positive electrode post 6 and a negative electrode post 6, which are disposed on the cover plate body 1 on both sides of the through hole along a second direction, the second direction being the length direction of the cover plate body 1; preferably, the positive electrode post 6 and the negative electrode post 6 are symmetrically distributed on both sides of the through hole along the length direction of the cover plate body 1, so that the connection path between the electrode post and the battery internal tab and connecting piece is shorter and the layout is more balanced, reducing the path loss and local resistance heating during current transmission. Compared with the asymmetrical layout, this design can avoid the problem of local overheating caused by uneven current distribution, and further reduce the temperature of the battery during charging and discharging; and, based on this structure, combined with multiple superimposed inner ring ribs 5 disposed on both sides of the explosion-proof valve 8 along the length direction of the boss 3, it is beneficial to reduce the position correspondence and distance between the ribs and the electrode post, so as to achieve synergy with the heat dissipation function of the ribs, jointly ensuring the thermal stability of the battery under high-rate fast charging and improving fast charging efficiency.

[0038] Reference Figure 4In some specific embodiments, the boss 3 is formed by continuous bending of the sealing plate 2. The wall thickness T of the boss 3 along the first direction is between 1.5mm and 2.5mm. The inner ring rib 5 and the outer ring rib 4 have the same height, and the relationship between the height h of the rib and the wall thickness T of the boss 3 is: 0.2T≤h≤1.0T.

[0039] This design, with a rib height of 0.2T≤h≤1.0T, allows the cooling components to fit tightly against the rib. Furthermore, by matching the rib to the wall thickness of the boss 3, the heat dissipation area of ​​the rib is maximized. For example, when T=2.5mm, h can reach 2.5mm, resulting in a significant three-dimensional heat dissipation effect. This allows for rapid conduction of heat generated during battery charging and discharging. Combined with the rib's distribution structure, the temperature rise of the cell's outer surface during cycling can be controlled below 60℃, meeting the low-temperature requirements of high-rate fast charging and ensuring a 10-25% improvement in fast charging capability. Simultaneously, the ratio of rib height h to boss 3 wall thickness T avoids structural fragility due to excessively thin boss 3 walls or insufficient heat dissipation due to excessively low ribs, ensuring a balance between heat dissipation and structural stability.

[0040] Furthermore, the relationship between the total area S0 of all exposed ribs and the total area S of the top surface and surrounding sides of the boss 3 is: 0.05S≤S0≤0.45S. This setting ensures that the ribs provide sufficient additional heat dissipation area to effectively conduct and dissipate the heat generated during battery charging and discharging. The lower limit of 5% avoids insufficient heat dissipation due to the rib area being too small, while the upper limit of 45% prevents the ribs from being too dense and affecting other functions of the boss 3, achieving a balance between heat dissipation efficiency and structural rationality. Moreover, the design of the total rib area relative to the total surface area of ​​the boss 3 at a ratio of 5%-45% can significantly increase the bonding area of ​​the outer surface of the boss 3. More ribs create a textured surface on the outer surface of the boss 3, increasing the contact area with the structural adhesive, improving the bonding strength between the structural adhesive and the boss 3, and further ensuring the overall safety and service life of the battery.

[0041] Furthermore, the outer ring rib 4 and the inner ring rib 5 have the same width, and the width a is between 0.6mm and 2.5mm, while the distance b between two adjacent inner ring ribs 5 is between 1.5mm and 3mm.

[0042] With this configuration, the width of the ribs is set to 0.6mm-2.5mm. Within this range, the ribs have sufficient heat conduction cross-sectional area to effectively transfer the heat generated by battery charging and discharging, and can provide a stable support surface, making it easy for cooling components to fit tightly with the ribs. The spacing between adjacent ribs is controlled within the range of 1.5mm-3mm. Multiple ribs can be reasonably arranged within the limited outer surface space of the boss 3, ensuring that the area of ​​the ribs accounts for 5%-45% of the outer surface area of ​​the boss 3, thus maximizing the heat dissipation area.

[0043] Most importantly, the 0.6mm-2.5mm rib width provides sufficient rigidity and deformation resistance to withstand external forces such as vibration and impact during battery use, reducing the risk of rib breakage and detachment. The 1.5mm-3mm adjacent spacing provides ample structural support space between the ribs, avoiding stress concentration after molding due to excessive spacing, or the lack of rib support and reduced deformation resistance in some areas of the boss 3 end face due to excessive spacing. This size design allows the ribs and boss 3 to form a stable overall structure, enhancing the damage resistance of the sealing plate 2 and the entire cover plate, and extending the battery life.

[0044] Furthermore, the relationship between the edge distance D between the outer ring rib 4 and the edge of the boss 3 is: 0.5T≤D≤2T. On the one hand, the 0.5T-2T edge distance reserved at the edge of the boss 3 provides a sufficiently flat bonding area for the structural adhesive to be applied to the outer surface of the boss 3, preventing sealing failure due to insufficient edge bonding; and it also reserves processing space and mold adaptation space at the edge of the boss 3, which meets the conventional mold processing requirements of battery cover and reduces production difficulty.

[0045] On the other hand, the reasonable range of the edge distance ensures that the outer ring rib 4 can effectively cover the heat dissipation area of ​​the boss 3 end face, and together with the inner ring rib 5, expand the heat dissipation area, keep the temperature rise of the outer surface of the cell below 60°C during the cycle, and meet the heat dissipation requirements of high-rate fast charging; it also avoids the outer ring rib 4 from getting too close to the edge of the boss 3, which would cause the boss 3 to interfere with other components in the battery pack, such as cooling components and fixing structures, and leaves the necessary installation gap for subsequent assembly, so as to facilitate the precise fit of the cooling components and the rib.

[0046] In this embodiment, since all the ribs are closed contours, the total width of the ribs is n×2a along the width direction or the length direction of the cover plate body 1. Along the third direction, the total width of all the ribs is n×2a, and the relationship between the total width of all the ribs and the total width W of the boss 3 is: 0.08W≤n×2a≤0.4W, where n is the number of ribs, the third direction is the width direction of the cover plate body 1, and the total width of the boss 3 is the total width of the upper surface plus the two side edges.

[0047] By setting the total width of the ribs along the width direction of the cover plate body 1 to be 8%-40% of the width of the boss 3, sufficient heat conduction cross-sectional area and structural support capacity are ensured for the ribs. This ensures that the rib area occupies 5%-45% of the outer surface area of ​​the boss 3 through the reasonable distribution of multiple ribs, effectively expanding the heat dissipation contact area and rapidly conducting the heat generated by battery charging and discharging. It also avoids the problem of excessive rib width leading to excessive occupation of the boss 3 surface, or insufficient heat dissipation area due to insufficient rib width. Combined with parameters such as the height and width of the ribs, the temperature rise of the outer surface of the battery cell during cycling can be stably controlled below 60℃, providing a low-temperature operating environment for high-rate fast charging, improving the battery's fast charging capability, and avoiding the risk of material aging and performance degradation caused by localized high temperatures.

[0048] The actual effect of the battery cover provided by the embodiments of the present invention is verified below through multiple sets of test examples, in conjunction with Table 1.

[0049] In Example 1, the height h of the rib is 0.5 mm, which satisfies the specified range of 0.2T≤h≤1.0T, i.e., 0.3 mm≤h≤2.5 mm; the width a of the rib is 0.8 mm, which satisfies the specified range of 0.6 mm≤D≤2.5 mm; the total width 2na of all the ribs accounts for 10% of the total width W of the boss 3, which satisfies 8%≤2na / W≤40%; the total area S0 of the ribs accounts for 5% of the outer surface area S of the boss 3, which satisfies 5%≤S0 / S≤45%. After actual charge and discharge testing, the maximum temperature rise of the outer surface of the battery cell in Example 1 during the cycle process is 59.8℃.

[0050] For details on the parameter values ​​of Examples 2 to 8, please refer to Table 1 above, which will not be repeated here.

[0051] In summary, in Examples 1 to 8, all parameters of the ribs were taken according to the parameter range defined in this example. After actual charge and discharge tests, the temperature rise of the outer surface of the battery cells in each example was controlled below 60°C during the cycle process, so that the battery could stably adapt to the high-rate fast charging technology solution, and the fast charging capability was improved by about 10%-25%.

[0052] In Comparative Example 1, the width a of the rib is 1mm, which satisfies the requirement of 0.6mm≤D≤2.5mm. The total width 2na of all the ribs accounts for 10% of the total width W of the boss 3, which satisfies 8%≤2na / W≤40%. The total area S0 of the ribs accounts for 8% of the outer surface area S of the boss 3, which satisfies 5%≤S0 / S≤45%. However, the height h of the rib is 0.2mm, which is too small. According to the actual charge and discharge test, the maximum temperature rise of the outer surface of the battery cell in Comparative Example 1 during the cycle process is 62℃. The temperature rise effect does not meet the design requirements and cannot provide a low-temperature operating environment for high-rate fast charging.

[0053] In Comparative Example 2, the height h of the rib is 0.3mm, which meets the specified range of 0.2T≤h≤1.0T, i.e., 0.3mm≤h≤2.5mm; the width a of the rib is 0.6mm, which meets the specified range of 0.6mm≤D≤2.5mm; the total area S0 of the rib accounts for 8% of the outer surface area S of the boss 3, which meets the requirement of 5%≤S0 / S≤45%. However, the total width 2na of all the ribs accounts for only 6% of the total width W of the boss 3, which does not meet the design parameter range. According to the actual charge and discharge test, the maximum temperature rise of the outer surface of the battery cell in Comparative Example 2 during the cycle process is 65.9℃, which does not meet the design requirements and cannot provide a low-temperature operating environment for high-rate fast charging.

[0054] In Comparative Example 3, the height h of the rib is 0.5mm, which meets the specified range of 0.2T≤h≤1.0T, i.e., 0.3mm≤h≤2.5mm; the width a of the rib is 1mm, which meets the specified range of 0.6mm≤D≤2.5mm; the total width 2na of all the ribs accounts for 10% of the total width W of the boss 3, which meets the requirement of 8%≤2na / W≤40%; however, the total area S0 of the ribs accounts for only 2.6% of the outer surface area S of the boss 3, which does not meet the design parameter range. According to the actual charge and discharge test, the maximum temperature rise of the outer surface of the battery cell in Comparative Example 3 during the cycle process is 72.9℃, which does not meet the design requirements and cannot provide a low-temperature operating environment for high-rate fast charging.

[0055] According to the design parameters and verification results of Examples 1-8 and Comparative Examples 1-3 in Table 1, it can be seen that by using the solution provided by the present invention to design the parameters of the battery cover plate, the temperature rise of the outer surface of the cell during cycling can be stably controlled below 60°C, providing a low-temperature operating environment for high-rate fast charging, improving the battery's fast charging capability, and avoiding the risk of material aging and performance degradation caused by local high temperature.

[0056] Reference Figure 3 The present invention also provides a battery, including a housing 9 and the aforementioned battery cover, wherein the battery cover is closed and fixed to the open end of the housing 9.

[0057] Because the battery uses the aforementioned battery cover plate with raised ribs, which is fixed to the housing 9, a complete heat dissipation system is formed. The total area of ​​the raised ribs on the cover plate accounts for 5%-45% of the outer surface area of ​​the boss 3. The size and shape design of the raised ribs can significantly increase the heat dissipation area and quickly conduct the heat generated by charging and discharging inside the housing 9. With the connection between the cooling components inside the battery pack and the raised ribs, the temperature rise of the outer surface of the cell during cycling can be controlled below 60°C, effectively solving the problem of heat accumulation inside the housing 9. This provides a stable low-temperature operating environment for the battery, ensuring a 10-25% improvement in fast charging capability and meeting the requirements of high-rate fast charging technology for battery thermal management.

[0058] This invention also provides a battery pack, including a cooling component and the battery described above, wherein the cooling component and the protruding ribs on the cover plate body 1 of the battery are bonded and fixed by structural adhesive.

[0059] Since the battery pack integrates the aforementioned battery with a ribbed cover plate, it possesses all of its advantages, which will not be elaborated further. After battery assembly, the cover plate serves as the top structure of the battery and is integrated into the battery pack as a whole, making it an important component of the battery cells within the battery pack. The cooling component is a thermal management component within the battery pack, which is attached to or fixed to the surface of the ribs. Through the increased contact area of ​​the ribs, it efficiently removes the heat generated by the battery during operation, thereby achieving battery cooling and improving fast charging performance.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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; and these 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 the present invention.

Claims

1. A battery cover, characterized in that, include: The cover plate body has through holes; A sealing plate is disposed at the through hole, and the sealing plate is sealed to the through hole; A boss is disposed on the outside of the sealing plate along a first direction, and the boss extends to the outside of the through hole along the first direction. Multiple ribs with closed contours are integrally formed on the end face of the boss away from the cover plate body. The first direction is the thickness direction of the cover plate body. The rib is a closed contour rib with a straight segment and / or an arc segment. The rib includes an outer ring rib and multiple inner ring ribs, and the multiple inner ring ribs are located in the area enclosed by the outer ring rib. The boss is formed by continuous bending of the sealing plate. The wall thickness T of the boss along the first direction is between 1.5mm and 2.5mm. The inner ring rib and the outer ring rib have the same height, and the relationship between the height h and the wall thickness T of the boss is: 0.2T≤h≤1.0T. The outer ring rib and the inner ring rib have the same width, and the width a is between 0.6mm and 2.5mm. The distance b between two adjacent inner ring ribs is between 1.5mm and 3mm. Along the third direction, the total width of all the ribs is n×2a, and the relationship between the total width of all the ribs and the total width W of the boss is: 0.08W≤n×2a≤0.4W, where n is the number of ribs, and the third direction is the width direction of the cover plate body; The relationship between the total exposed area S0 of all the ribs and the total area S of the top surface and surrounding sides of the boss is: 0.05S≤S0≤0.45S.

2. The battery cover according to claim 1, characterized in that, Also includes: Positive terminal; The negative terminal and the positive terminal are disposed on the cover plate body on both sides of the through hole along a second direction, the second direction being the length direction of the cover plate body.

3. The battery cover according to claim 1, characterized in that, The relationship between the distance D between the outer ring rib and the edge of the boss is 0.5T≤D≤2T.

4. A battery, characterized in that, It includes a housing and a battery cover as described in any one of claims 1-3, the battery cover being closed and fixed to the open end of the housing.

5. A battery pack, characterized in that, include: The cooling component and the battery as described in claim 4, wherein the cooling component is bonded and fixed to the ribs on the cover body of the battery by structural adhesive.

Images