Battery cover plate, shell structure and battery cell

Abstract

The invention relates to the technical field of power batteries, and provides a battery cover plate, a shell structure and a battery cell, the battery cover plate comprises a cover plate body, and an electrode lead-out hole and a convex hull which are arranged on the cover plate body; the convex hull protrudes towards one side of the thickness direction of the cover plate body; convex ribs are formed on the end face, away from the cover plate body, of the convex hull and protrude out of the end face in the direction away from the cover plate body. According to the arrangement, the convex hull can serve as a supporting component to bear a cooling component in the Pack package, water cooling equipment of the Pack package can directly act on an electrode, the convex ribs can increase the outer surface area of the convex hull on the premise that the overall size of the convex hull is not remarkably increased, and therefore the heat dissipation area of the convex hull is increased, and the heat dissipation effect of the convex hull is enhanced. The convex hulls and the convex ribs on the convex hulls can be matched with a water cooling component to effectively reduce the temperature of an electrode area under the working condition of battery charging and discharging, so that the quick charging performance of the battery is improved.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, and in particular to a battery cover, housing structure and battery cell. Background Technology

[0002] With the rapid development of new energy technologies, power batteries, as core components in electric vehicles and energy storage systems, have seen their fast-charging performance become a key indicator affecting user experience. During fast charging, the terminals and related structures on the battery cover generate heat due to the large current flowing through them. If this heat cannot be dissipated effectively and in a timely manner, it may affect the battery's charging and discharging efficiency and cycle life, and may even lead to safety hazards such as thermal runaway. Therefore, timely and effective heat dissipation is crucial for improving the fast-charging performance of batteries.

[0003] Currently, industry-wide cooling solutions for battery cells primarily focus on heat dissipation from the large surface area and bottom of the cell. However, due to the integrated protruding structures such as terminals and contact plates on the cell cover, the water-cooling plate of the entire battery pack cannot effectively adhere to the cover surface for targeted cooling. If the water-cooling plate is directly attached to the terminals, the terminals will be subjected to additional pressure, leading to a reduction in their lifespan. In severe cases, this can even cause the terminals and their connecting tabs to detach, resulting in battery failure. These limitations hinder further improvements in battery fast-charging performance.

[0004] In view of the above problems, how to achieve heat dissipation in the electrode area and further improve the fast charging performance of the battery has become an important technical problem that urgently needs to be solved. Summary of the Invention

[0005] This invention provides a battery cover, a housing structure, and a battery cell to solve the problem of heat dissipation difficulties in the electrode area of ​​batteries in the prior art, which makes it difficult to further improve fast charging performance. It can effectively achieve heat dissipation in the electrode area, thereby further improving fast charging performance.

[0006] This invention provides a battery cover, comprising: The cover plate body and the electrode lead-out holes and protrusions disposed on the cover plate body; The convex bulge protrudes towards one side of the cover plate body in the thickness direction; A rib is formed on the end face of the convex bulge away from the cover plate body, and the rib protrudes from the end face in a direction away from the cover plate body.

[0007] According to a battery cover provided by the present invention, the ribs are provided in one or multiple alternating arrangements.

[0008] According to a battery cover provided by the present invention, the rib is configured as annular; The multiple ribs are concentrically nested from the inside out, and the multiple ribs are arranged alternately.

[0009] According to a battery cover provided by the present invention, the ribs include: The straight line segment extends along the length direction of the convex hull and is arranged at least two segments at intervals along the width direction of the convex hull; There are two arc-shaped segments, located at the two ends of the straight segments respectively, and the same end of the two straight segments is connected by the arc-shaped segments.

[0010] According to a battery cover provided by the present invention, the straight segments are arranged symmetrically about the width centerline of the convex bulge; The arc-shaped segments are arranged symmetrically about the length centerline of the convex hull.

[0011] According to a battery cover provided by the present invention, the total surface area S0 of the ribs accounts for 5 to 45% of the outer surface area S of the rib.

[0012] According to a battery cover provided by the present invention, in the width direction of the convex bulge, the total width W0 of the convex ribs accounts for 8 to 40% of the width W of the convex bulge.

[0013] According to the present invention, each of the ribs has an equal width, and the total width W0 of the ribs is: W0 = n × 2a; Where n is the number of the raised ribs; a is the width of each raised rib.

[0014] A battery cover provided by the present invention, The height h of the rib protruding from the end face is 0.2 to 1.0 times the wall thickness T of the rib; and / or, The width 'a' of the rib is 0.6 ≤ a ≤ 2.5 mm; and / or, The spacing b of the raised ribs is 1.5 ≤ b ≤ 3 mm; and / or, The distance D between the outermost convex rib and the edge of the convex hull is 0.2 to 2 times the wall thickness of the convex hull; and / or, The wall thickness T of the convex hull is 1.5 ≤ T ≤ 2.5 mm; and / or, The length L1 of the straight line segment is 0.35 to 0.85 times the length L of the convex hull.

[0015] The present invention also provides a housing structure, including a housing component and a battery cover plate as described in any one of the above-mentioned claims connected to the housing component; The cover plate is integrally formed at one end of the housing component, and the opposite end of the housing component is set as an open opening.

[0016] The present invention also provides a battery cell, including the battery cover plate described in any one of the above claims or the housing structure described above.

[0017] The battery cover, housing structure, and battery cell provided by this invention, when assembled into the housing of the battery cell using the aforementioned battery cover, have electrodes led out from electrode lead-out holes and protrude along with the convex bulge towards the same side of the cover body, i.e., the outer side of the housing cavity. The convex bulge can serve as a support component to support the cooling components within the pack, thereby allowing the pack's water-cooling equipment to directly act on the electrodes without subjecting them to additional pressure. Furthermore, the ribs increase the outer surface area of ​​the convex bulge without significantly increasing its overall volume, thus increasing its heat dissipation area and enhancing its heat dissipation effect. Compared to related technologies, the convex bulge and its ribs, in conjunction with the water-cooling components, can effectively reduce the temperature of the electrode area during battery charging and discharging, thereby improving the battery's fast-charging performance.

[0018] In addition to the above, the raised bump, as a supporting component, can directly absorb external impacts on the upper surface of the battery pack, reducing or even eliminating the direct impact force on the electrodes. This lowers the risk of short circuits caused by external impacts, ensuring the long-term stable operation of the battery. The raised ribs also act as reinforcing ribs, improving the overall structural strength and load-bearing capacity of the raised bump, ensuring its stability and reliability. Besides the functions mentioned above, the raised ribs also increase the bonding area between the upper surface of the raised bump and the structural adhesive, thereby improving the structural stability of the entire battery pack. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the shell structure provided in an embodiment of the present invention.

[0021] Figure 2 This is one of the top views of the battery cover provided in an embodiment of the present invention.

[0022] Figure 3 This is a second top view of the battery cover provided in an embodiment of the present invention.

[0023] Figure label: 110. Cover plate; 120. Electrode lead-out hole; 130. Protrusion; 140. Protrusion rib; 141. Straight section; 142. Arc section; 150. Liquid injection hole; 210. Housing component. Detailed Implementation

[0024] 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.

[0025] To better understand the battery cover, housing structure, and battery cell provided in the embodiments of the present invention, we first introduce its application background. In the battery field, heat dissipation is one of the key factors restricting the fast charging performance of batteries. At present, the industry's cooling solutions for battery cells mainly focus on heat dissipation of the large surface and bottom of the battery cell. However, due to the integrated protruding structures such as terminals and plates on the battery cell cover, the water cooling plate of the entire battery pack cannot form an effective fit with the surface of the cover to achieve targeted cooling. If the water cooling plate is directly attached to the terminals, the terminals will be subjected to additional pressure, which will reduce their service life. In severe cases, it may even cause the terminals and the connecting pieces connected to their outer surfaces to fall off, leading to battery failure.

[0026] Due to the constraints of the aforementioned issues, it is difficult to achieve targeted heat dissipation in the electrode area, making it difficult to further improve the fast charging performance of the battery.

[0027] In view of the above problems, embodiments of the present invention provide a battery cover, a housing structure and a battery cell, which can achieve effective heat dissipation in the electrode area, thereby further improving the fast charging performance of the battery.

[0028] The following is combined with Figures 1 to 3 The present invention describes the battery cover, housing structure, and battery cell.

[0029] Reference Figure 1 and Figure 2 A battery cover includes a cover body 110 and an electrode lead-out hole 120 and a protrusion 130 disposed on the cover body 110; wherein the protrusion 130 protrudes toward one side of the cover body 110 in the thickness direction; a rib 140 is formed on the end face of the protrusion 130 away from the cover body 110, and the rib 140 protrudes from the end face in the direction away from the cover body 110.

[0030] In practical applications, when the aforementioned battery cover is assembled into the outer casing of the battery cell, the electrodes are led out through the electrode lead-out holes 120 and protrude along with the convex 130 towards the same side of the cover body 110, i.e., the outer side of the outer casing cavity. The convex 130 can serve as a support component to support the cooling components inside the pack, thereby allowing the water-cooling equipment of the pack to directly act on the electrodes without subjecting them to additional pressure. The rib 140 increases the outer surface area of ​​the convex 130 without significantly increasing its overall volume, thus increasing its heat dissipation area and enhancing its heat dissipation effect. Compared to related technologies, the convex 130 and its rib 140, in conjunction with the water-cooling components, can effectively reduce the temperature of the electrode area during battery charging and discharging, thereby improving the battery's fast-charging performance.

[0031] In addition to the above, the protrusion 130, as a supporting component, can directly withstand external impacts on the upper surface of the battery pack, reducing or even eliminating the direct impact force on the electrodes. This lowers the risk of short circuits caused by external impacts and ensures long-term stable operation of the battery. The protrusion 140 also serves as a reinforcing rib, improving the overall structural strength and load-bearing capacity of the protrusion 130 and ensuring its stability and reliability. Besides the aforementioned functions, the protrusion 140 also increases the bonding area between the upper surface of the protrusion 130 and the structural adhesive, thereby improving the structural stability of the entire battery pack.

[0032] It is understandable that the cover plate 110, as the supporting foundation for various components, can have its shape, size, and material parameters selected and designed according to actual needs, such as the shape, size specifications, and strength requirements of the battery cell.

[0033] In one example of the present invention, the cover plate 110 is a rectangular plate made of aluminum alloy. In its thickness direction, the cover plate 110 has two opposing sides. When the cover plate 110 is assembled into the housing of a battery cell, one side faces the inside of the housing cavity, and the other side faces the outside of the housing cavity. The electrode lead-out hole 120 penetrates the aforementioned two sides of the cover plate 110, so that after the electrode (e.g., a pole) passes through the electrode lead-out hole 120, one end of it is located inside the housing cavity and connected to the electrode lug of the electrode assembly, while the other end protrudes outside the housing cavity to draw out current. The protrusion 130 protrudes outwards from the housing cavity. Thus, the end face of the protrusion 130 away from the cover plate 110 can serve as a receiving surface, directly fitting into the water-cooling equipment to achieve heat exchange between the protrusion 130 and the water-cooling equipment.

[0034] Understandably, the specific shape, size, and quantity of the convex hull 130 need to be selected and designed according to actual requirements.

[0035] For example, there can be one or more convex hulls 130. The convex hull 130 can be set as a rectangle or designed as other shapes (such as circles or other regular and irregular polygons). In addition, the size of the convex hull 130 can be adjusted to adapt to the receiving and heat dissipation requirements under different working conditions without affecting the electrode's current carrying capacity.

[0036] To further illustrate, when there is one convex bulge 130, it can be symmetrical about the center lines of the long and short sides of the cover plate 110; when there are two or more convex bulges 130, they can also be symmetrical about the center lines of the long and short sides of the cover plate 110. This ensures that when the convex bulge 130 is under stress, the force can be evenly distributed throughout the cover plate 110, guaranteeing balanced stress and improving the structural stability and load-bearing capacity of the convex bulge 130.

[0037] In addition, depending on different actual needs, the convex bulge 130 can be formed on the cover plate 110 using different processes, including but not limited to welding or integral forming.

[0038] In detail, the segmented processing and welding process can form a complex convex hull 130, while the integral molding can ensure the structural integrity and structural strength of the convex hull 130 and the cover plate 110.

[0039] In more detail, the integral forming methods of the convex bulge 130 and the cover plate 110 include, but are not limited to, stamping forming, integral die casting forming, etc., and are not specifically limited in the embodiments of the present invention.

[0040] In a specific example of the present invention, a convex bulge 130 is provided and integrally formed on the cover plate body 110. The overall structure of the convex bulge 130 is rectangular and symmetrical about the center line of the long side and the center line of the short side of the cover plate body 110. That is to say, the convex bulge 130 is located at the geometric center of the cover plate body 110.

[0041] This integrated molding design ensures the structural integrity and strength of the battery cover, enhancing the load-bearing capacity of the protrusion 130. The rectangular structure of the protrusion 130 adapts to the shape of the cover body 110, maximizing the use of the surface space of the cover body 110. Furthermore, the symmetrical arrangement allows for the even distribution of force across the entire cover body 110 when the protrusion 130 is under stress, ensuring balanced force distribution and further improving the structural stability and load-bearing capacity of the protrusion 130.

[0042] In more detail, the convex hull 130 integrates an injection hole 150, which is located at the geometric center of the convex hull 130. This arrangement allows the convex hull 130 to perform multiple functions, including support, heat dissipation, and electrolyte injection, while avoiding interference and making full use of the space on the end face of the convex hull 130.

[0043] The end face of the protrusion 130 away from the cover plate 110 serves as the receiving area that directly contacts the water-cooling equipment. The protruding ribs 140 provided on it can effectively increase the heat exchange area, enhance the heat exchange effect of the protrusion 130, increase the bonding area ratio between the end face and the structural adhesive, and improve the structural stability.

[0044] The following will be combined with the appendix Figure 2 and 3 The specific structural form of the rib 140 is described below. For ease of description, unless otherwise specified, the end face referred to below refers to the end face of the rib 130 away from the cover plate body 110. In addition, for ease of understanding, the direction in which the rib 130 extends along its own long side is defined as its length direction, and the direction in which it extends along its own short side is defined as its width direction.

[0045] Understandably, depending on different needs, the rib 140 can be set in different structural forms.

[0046] For example, the rib 140 can be a single rib, which covers the entire end face in a "serpentine" or "recurved" pattern. Alternatively, multiple ribs 140 can be provided, which cover the entire end face in an alternating or crisscrossing arrangement.

[0047] Furthermore, in a feasible example, multiple ribs 140 extend along the length or width of the bulge 130 and are spaced apart in another direction, thus covering the entire end face.

[0048] Furthermore, in another feasible example, the multiple ribs 140 can also be arranged in a ring-like nesting manner, that is, the multiple ribs 140 are arranged in a ring-like manner with the center of the end face as the reference, and the adjacent ring-like ribs 140 maintain a certain distance, so as to cover the entire end face.

[0049] Furthermore, in another feasible example, the multiple ribs 140 can also be arranged radially, that is, with the center of the end face of the convex hull 130 as the reference point, each rib 140 extends radially and evenly from the center position to the edge of the end face, eventually forming a radial structure covering the end face.

[0050] Furthermore, in another feasible example, multiple ribs 140 can also be arranged in a cross pattern or other shapes to cover the entire end face of the convex hull 130.

[0051] In addition, the cross-sectional shape of the rib 140 needs to be designed according to the actual heat dissipation requirements, material characteristics and processing costs, including but not limited to rectangles, trapezoids, etc., and no specific restrictions are imposed in this embodiment of the invention.

[0052] In addition to the above, the forming method of the rib 140 on the bulge 130 also needs to take into account the material characteristics of the bulge 130, the structural complexity of the rib 140, the processing cost, etc., including but not limited to stamping forming, integral die casting forming, etc., and no specific restrictions are made in this embodiment of the invention.

[0053] Taking into account factors such as the processing difficulty, processing cost, and heat dissipation efficiency of the rib 140, in this embodiment, the rib 140 is set as a ring structure, with multiple ribs 140 nested concentrically from the inside out, and adjacent ribs 140 are arranged alternately, so that multiple ribs 140 cover the entire end face.

[0054] In detail, each rib 140 includes a straight segment 141 and an arc segment 142. The straight segment 141 extends along the length of the bulge 130 and is arranged at least two at intervals along the width of the bulge 130. There are two arc segments 142, located at the two ends of the straight segment 141 respectively, and the same end of the two straight segments 141 is connected by the arc segment 142. With this arrangement, the straight segments 141 and the arc segments 142 are connected in sequence, making the rib 140 have a "racetrack-shaped" structure, maximizing the coverage of the end face and reducing heat dissipation dead zones.

[0055] To elaborate further, the two straight segments 141 are arranged symmetrically about the width midline of the convex hull 130, and the two arc segments 142 are arranged symmetrically about the length midline of the convex hull 130.

[0056] This arrangement ensures that multiple ribs 140 are concentrically arranged around the geometric center of the bulge 130, avoiding heat dissipation dead zones caused by uneven distribution of the ribs 140 in local areas, and achieving uniform heat conduction and diffusion on the surface of the bulge 130. Furthermore, this symmetrical structure of the ribs 140 can evenly distribute the impact force across the entire bulge 130 when the end face of the bulge 130 is subjected to external impact, reducing local stress concentration and further improving the overall structural strength and load-bearing capacity of the end face of the bulge 130.

[0057] Understandably, in some optional examples, the multiple ribs 140 can be arranged at equal intervals or at non-equal intervals, and the width of each rib 140 can be equal or unequal. Furthermore, the height, width, number, and other parameters of the ribs 140 protruding from the end face need to be further designed in conjunction with heat dissipation requirements.

[0058] In one example of the present invention, the total surface area S0 of the rib 140 accounts for 5 to 45% of the outer surface area S of the bulge 130.

[0059] With the above technical solutions, if the total surface area ratio of the ribs 140 is less than 5%, it indicates that the number, height, or thickness of the ribs 140 has been excessively reduced, resulting in insufficient heat dissipation area and difficulty in meeting the heat dissipation requirements of fast battery charging. If the ratio is higher than 45%, it means that the number of ribs 140 or the size of the ribs 140 needs to be increased to meet the larger area ratio. This will not only increase the process cost and the weight of the battery cover, but may also lead to a reduction in the spacing between the ribs 140, forming a stagnant area between the ribs. As the heat dissipation area further increases, the improvement in heat dissipation efficiency is limited, resulting in an imbalance between process cost and heat dissipation effect. By making the total surface area S0 of the ribs 140 account for 5% to 45% of the outer surface area S of the protrusion 130, a balance between heat dissipation effect and cost can be achieved.

[0060] It should be noted here that the total surface area S0 of the rib 140 is the sum of the surface areas of the multiple ribs 140, and the surface area of ​​each rib 140 is the sum of its side surface area and top surface area.

[0061] In a further example of the present invention, in the width direction of the convex hull 130, the total width W0 of the convex rib 140 accounts for 8 to 40% of the total width W of the convex hull 130.

[0062] With the above technical solution, if the total width of the rib 140 is less than 8%, it indicates that the coverage of the rib 140 in the width direction of the convex hull 130 is too narrow, resulting in uneven heat dissipation. If the total width of the rib 140 is greater than 40%, it indicates that the coverage of the rib 140 in the width direction of the convex hull 130 is too large, and it is necessary to increase the number of ribs 140 or increase the width of the rib 140 to meet the greater width ratio. This will also lead to problems such as reduced spacing between the ribs 140, increased processing difficulty, and increased processing costs, resulting in an imbalance between process cost and heat dissipation effect.

[0063] It is understandable that the total area S0 of the rib 140 is determined by the length, height, width and number of the rib 140, while the total width W0 of the rib 140 is determined by the width and number of the rib 140.

[0064] In one example of the present invention, the length L1 of the straight segment 141 of the rib 140 is 0.35 to 0.85 times the length L of the bulge 130. This arrangement provides necessary transition space for the arc segment 142, ensuring that the arc segment 142 can smoothly connect the two straight segments 141 with a reasonable radius. This avoids the arc segment 142 becoming too small in radius and excessively curved due to the straight segment 141 being too long, or the arc segment 142 becoming too large in proportion and affecting the coverage of the bulge 130 by the straight segment 141 being too short.

[0065] In one example of the present invention, the wall thickness of the convex hull 130 is set to T, and the height h of the convex rib 140 protruding from the end face is (0.2~1.0)T.

[0066] Through the above technical solutions, if the height of the rib 140 is less than 0.2T, the height of the rib 140 is too low, and its contribution to heat dissipation is limited. The total area of ​​the rib 140 is difficult to achieve the set area ratio. If the height of the rib 140 is greater than 1.0T, on the one hand, it will occupy a large space within the battery pack; on the other hand, due to the thicker wall at the rib 140, the heat conduction path is longer, which may lead to difficulty in timely heat dissipation and localized heat accumulation. Furthermore, increasing the height of the rib 140 will increase the manufacturing difficulty and cost. By setting the height h of the rib 140 to 0.2~1.0T, it is possible to reduce its space occupation while ensuring that the total area of ​​the rib 140 reaches the set ratio, and also to ensure timely heat dissipation, while reducing manufacturing difficulty and cost.

[0067] In detail, the wall thickness T of the convex hull 130 is 1.5≤T≤2.5mm.

[0068] In one example of the present invention, the width a of the rib 140 is 0.6≤a≤2.5mm, and the spacing b of the ribs 140 is 1.5≤b≤3mm.

[0069] With this configuration, the width and spacing of the rib 140 directly affect the total area S0 and the total width W0 of the rib 140. By setting the width a of the rib 140 to 0.6≤a≤2.5mm and the spacing b of the rib 140 to 1.5≤b≤3mm, the total area S0 and the total width W0 of the rib 140 can meet the design requirements.

[0070] Optionally, the widths of different 140mm ribs can be equal or unequal, depending on the actual needs.

[0071] In this embodiment, in order to ensure the structural consistency and stability of the ribs 140, the width of each rib 140 is equal. Thus, in the width direction of the ribs 130, the total width W0 of the ribs 140 is W0 = n × 2a, where n is the number of ribs 140.

[0072] It is understood that the number n of the protruding ribs 140 needs to be designed according to the size of the protruding bulge 130, the width of the protruding ribs 140, and the spacing of the protruding ribs 140. No specific restrictions are imposed in this embodiment of the invention.

[0073] In a further example of the present invention, two adjacent ribs 140 are arranged at equal intervals. Furthermore, to facilitate the manufacturing process of the ribs 140 and to ensure their strength, the distance D between the outermost rib 140 and the edge of the end face of the bulge 130 is 0.5 to 2 times the wall thickness T of the bulge 130. This arrangement provides sufficient operating space for the manufacturing process, ensures the structural strength of the edge of the bulge 130, and prevents the ribs 140 from being too close to the edge of the bulge 130, thus avoiding any impact on the structural stability of the ribs 140.

[0074] With the above technical solution, when the rib 140 meets the design requirements, the bonding area between the upper surface of the rib 130 and the structural adhesive increases by 3-25%. During the cell cycle, the temperature rise of the outer surface can be controlled below 60°C, which is lower than the 65-80°C in the prior art. The fast charging capability of the battery is improved by about 10-35%.

[0075] To verify the effectiveness of the above scheme, different Design of Engineering (DOE) were deployed, and the results are shown in Table 1: Table 1 (Dimensions in mm) h a <![CDATA[W0 / W]]> <![CDATA[S0 / S]]> Verification effect 0.3～2.5 0.6～2.5 8～40% 3～25% 60℃ Example 1 0.5 0.8 10.0% 5.0% During the cell cycling process, the maximum temperature rise on the outer surface is 59.8°C. Example 2 1.8 1.0 15.5% 10.3% During the cell cycling process, the maximum temperature rise on the outer surface is 57.5°C. Example 3 1.0 1.2 18.0% 15.0% During the cell cycling process, the maximum temperature rise on the outer surface is 55.3°C. Example 4 1.2 1.5 20.0% 18.0% During the cell cycling process, the maximum temperature rise on the outer surface was 53.1°C. Example 5 1.5 1.8 25.0% 20.2% During the cell cycling process, the maximum temperature rise on the outer surface is 52.6°C. Example 6 1.8 2.0 30.0% 21.5% During the cell cycling process, the maximum temperature rise on the outer surface was 51.8°C. Example 7 2.0 2.2 35.0% 22.6% During the cell cycling process, the maximum temperature rise on the outer surface is 50.8°C. Example 8 2.5 2.5 40.0% 25.0% During the cell cycling process, the maximum temperature rise on the outer surface was 49.1°C. Comparative Example 1 0.4 1 10.0% 8.0% During the cell cycling process, the maximum temperature rise on the outer surface is 62°C. Comparative Example 2 0.3 0.6 6 8.0% During the cell cycling process, the maximum temperature rise on the outer surface is 65.9°C. Comparative Example 3 0.5 1 10.0% 7.6% During the cell cycling process, the maximum temperature rise on the outer surface was 72.2°C. Based on the above test results, it can be seen that when the design of the rib 140 meets the above requirements, the outer surface temperature of the cell during cycling can be controlled below 60℃, which is better than the 65-80℃ in the prior art, and the fast charging capability of the battery is improved by about 10-35%. Furthermore, as can be seen from Examples 1-8 and Comparative Examples 1-3, when the width or area ratio of the rib 140 increases, the temperature rise of the cell's outer surface decreases, and the heat dissipation effect is further enhanced. When the height, number, or width of the rib 140 is insufficient, resulting in an insufficient width or area ratio, the temperature will relatively increase.

[0076] The housing structure provided by the present invention is described below. The housing structure described below can be referred to in correspondence with the battery cover described above.

[0077] Reference Figure 1 A housing structure includes a housing member 210 and a battery cover plate provided in any of the above examples connected to the housing member 210; a protrusion 130 is disposed on a side of the cover plate body 110 facing the outside of the cavity of the housing member 210 and protrudes in a direction away from the cavity of the housing member 210.

[0078] It is understandable that the housing 210 and the cover plate 110 can be fixed by welding using conventional processes, including but not limited to laser welding and resistance welding.

[0079] However, in practical applications, it has been found that when the entire battery pack is subjected to external impact, the cover plate 110 will be stressed, which may cause cracks in the welded surface between it and the housing 210. This not only affects the connection strength between the two, but may also damage the sealing performance of the battery cell, leading to safety hazards such as electrolyte leakage and battery cell short circuit.

[0080] In view of the above problems, in a further example of the present invention, the cover plate 110 is integrally formed on one end of the housing component 210, and the opposite end of the housing component 210 is set as an open end. This configuration eliminates the weld seam between the side wall and the upper cover in the traditional welded housing, effectively avoiding cracking problems caused by excessive external impact or long-term load, ensuring the overall structural strength of the housing assembly, reducing safety hazards such as electrolyte leakage and cell short circuit, and ensuring the long-term stable operation of the cell.

[0081] It is understandable that the forming methods of the cover plate 110 and the housing part 210 include, but are not limited to, stamping forming, integral die casting forming, etc.

[0082] In more detail, the shell structure also includes a base plate, which is fixedly connected to the open end of the shell component 210 by welding. An explosion-proof valve is installed on the base plate. This configuration enables thermal and electrical separation, preventing the impact of high-temperature gases, flames, corrosive electrolytes, and other high-temperature ejected materials on the battery cell during thermal runaway, thereby avoiding safety risks caused by secondary short circuits or thermal propagation during battery cell thermal runaway.

[0083] The battery cell provided by the present invention is described below. The battery cell described below can be referred to in correspondence with the housing structure described above.

[0084] A battery cell includes an electrode assembly and a housing structure for accommodating the electrode assembly as provided in any of the above examples.

[0085] When the battery cover, housing structure, and battery cell provided in this embodiment of the invention are assembled into the housing of the battery cell using the aforementioned battery cover, the electrodes are led out from the electrode lead-out holes 120 and protrude along with the protrusion 130 towards the same side of the cover body 110, i.e., the outer side of the housing cavity. The protrusion 130 can serve as a support component to support the cooling components inside the pack, thereby allowing the water cooling equipment of the pack to directly act on the electrodes without subjecting them to additional pressure. The rib 140 can increase the outer surface area of ​​the protrusion 130 without significantly increasing its overall volume, thereby increasing its heat dissipation area and enhancing the heat dissipation effect of the protrusion 130. Compared with related technologies, the protrusion 130 and its rib 140 can effectively reduce the temperature of the electrode area under battery charging and discharging conditions in conjunction with the water cooling components, thereby improving the fast charging performance of the battery.

[0086] In addition to the above, the protrusion 130, as a supporting component, can directly withstand external impacts on the upper surface of the battery pack, reducing or even eliminating the direct impact force on the electrodes. This lowers the risk of short circuits caused by external impacts and ensures long-term stable operation of the battery. The protrusion rib 140 also serves as a reinforcing rib, improving the overall structural strength and load-bearing capacity of the protrusion 130 and ensuring its stability and reliability. Besides the functions mentioned above, the protrusion rib 140 also increases the bonding area between the upper surface of the protrusion 130 and the structural adhesive, thereby improving the structural stability of the entire battery pack.

[0087] 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 (110) and the electrode lead-out hole (120) and the protrusion (130) provided on the cover plate body (110). The convex bulge (130) protrudes towards the side of the cover plate body (110) in the thickness direction; The convex bulge (130) has a rib (140) formed on the end face away from the cover plate body (110), and the rib (140) protrudes from the end face in a direction away from the cover plate body (110).

2. The battery cover according to claim 1, characterized in that, The rib (140) is configured as a ring; The multiple ribs (140) are concentrically nested from the inside out, and the multiple ribs (140) are arranged alternately.

3. The battery cover according to claim 2, characterized in that, The rib (140) includes: The straight line segment (141) extends along the length direction of the convex hull (130) and is arranged at least two at intervals along the width direction of the convex hull (130); There are two arc segments (142) located at the two ends of the straight segments (141), and the same end of the two straight segments (141) is connected by the arc segments (142).

4. The battery cover according to claim 3, characterized in that, The straight line segment (141) is arranged symmetrically about the width centerline of the convex hull (130); The arc segment (142) is arranged symmetrically about the length centerline of the convex hull (130).

5. The battery cover according to any one of claims 1 to 4, characterized in that, The total surface area S0 of the rib (140) accounts for 5 to 45% of the outer surface area S of the bulge (130).

6. The battery cover according to claim 3 or 4, characterized in that, In the width direction of the convex hull (130), the total width W0 of the convex rib (140) accounts for 8 to 40% of the width W of the convex hull (130).

7. The battery cover according to claim 6, characterized in that, The width of each of the ribs (140) is equal, and the total width W0 of the ribs (140) is: W0 = n × 2a; Where n is the number of the ribs (140); a is the width of each rib (140).

8. The battery cover according to claim 3 or 4, characterized in that, The height h of the protrusion h of the rib (140) extending beyond the end face is 0.2 to 1.0 times the wall thickness T of the rib (130); and / or, The width a of the rib (140) is 0.6 ≤ a ≤ 2.5 mm; and / or, The spacing b of the ribs (140) is 1.5 ≤ b ≤ 3 mm; and / or, The distance D between the outermost rib (140) and the edge of the bulge (130) is 0.2 to 2 times the wall thickness T of the bulge (130); and / or, The wall thickness T of the convex hull (130) is 1.5 ≤ T ≤ 2.5 mm; and / or, The length L1 of the straight line segment (131) is 0.35 to 0.85 times the length L of the convex hull (12).

9. A shell structure, characterized in that, Includes a housing component (210) and a battery cover plate as described in any one of claims 1 to 8 connected to the housing component (210); The cover plate (110) is integrally formed on one end of the housing part (210), and the other end of the housing part (210) is set as an open opening.

10. A battery cell, characterized in that, Includes the battery cover as described in any one of claims 1 to 8 or the housing structure as described in claim 9.

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