Battery cover plate and battery

Abstract

The application belongs to the technical field of batteries, and discloses a battery cover plate and a battery. The battery cover plate comprises a cover plate body comprising a mounting portion, a connecting portion and a protection portion, and a pole module. The connecting portion is connected with the mounting portion at a low position and connected with the protection portion at a high position. The pole module comprises a conductive pole. A part of the conductive pole is parallel to the mounting portion and insulatedly connected with the mounting portion, and another part of the conductive pole is parallel to the connecting portion and insulatedly connected with the connecting portion. The conductive pole is located below the surface of the protection portion away from the pole group. By making the surface of the protection portion away from the pole group higher than the conductive pole, on the one hand, the space outside the battery cover plate is reduced, the battery module assembly rate is improved, and the high-position protection portion can protect the pole module from damage caused by collision; on the other hand, the high-position protection portion expands the space below it, increasing the volume and capacity of the pole group; in addition, the conductive pole is arranged on the mounting portion and the connecting portion, increasing the overcurrent area and improving the overcurrent capacity.

Description

Technical Field

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

[0002] As a crucial component of lithium batteries, the battery cover's structural design not only affects the battery's basic performance (such as capacity and charge / discharge efficiency) but also directly relates to its safety and long-term reliability. The main components of the battery cover include conductive electrode posts, a plain aluminum plate, riveting blocks, outer insulation components, inner insulation components, sealing components, and explosion-proof valves.

[0003] Currently, traditional battery cover plates typically have a flat aluminum plate structure. One end of the conductive electrode post passes through the aluminum plate and is connected to it via a rivet block, with an external insulating component between the rivet block and the aluminum plate for insulation protection; the other end is located on the other side of the aluminum plate and is welded to the electrode lug of the electrode assembly, while an internal insulating component provides insulation protection between the conductive electrode post and the aluminum plate.

[0004] This structure leads to two problems after the traditional battery cover is assembled, because the aluminum plate is flat: First, the rivet blocks and outer insulation parts on the outside of the aluminum plate protrude from the plate surface due to the stacked installation, occupying additional external space and affecting the assembly rate of the battery module; Second, the conductive electrode posts and inner insulation parts on the other side of the aluminum plate also protrude from the plate surface, occupying internal space, resulting in low space utilization between the electrode group and the aluminum plate, limiting the volume of the electrode group, and thus reducing the battery capacity. Summary of the Invention

[0005] The purpose of this invention is to provide a battery cover and a battery that not only saves assembly space for the battery module and increases the assembly rate of the battery module, but also improves the utilization rate of internal space, increases the volume of the electrode assembly, and enhances the battery capacity.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] On one hand, a battery cover is provided, the battery cover comprising:

[0008] The cover plate body includes a mounting part, a connecting part, and a protective part. The connecting part is inclinedly disposed between the mounting part and the protective part. The lower end of the connecting part is connected to the mounting part, and the higher end of the connecting part is connected to the protective part.

[0009] The electrode module includes a conductive electrode post, a portion of which is parallel to the mounting portion and insulatedly connected to the mounting portion, and another portion of which is parallel to the connecting portion and insulatedly connected to the connecting portion. Along a first direction, the conductive electrode post is located below the surface of the protective portion away from the electrode assembly.

[0010] Optionally, the distance between the protective part and the side of the conductive electrode post closest to the protective part along a direction parallel to the connecting part is W, and satisfies 3mm≤W≤10mm.

[0011] Optionally, the angle between the connecting part and the mounting part on the side away from the pole group is N, and satisfies 100°≤N≤140°.

[0012] Optionally, the cover plate body further includes a limiting part, the limiting part is disposed on the side of the cover plate body facing the pole group, the limiting part includes a limiting end plate and a limiting side plate, the limiting end plate is connected to the side of the mounting part away from the connecting part, and the limiting side plate is disposed on both sides of the limiting end plate along the second direction and connected to the mounting part;

[0013] And / or, the limiting end plate is connected to the side of the protective part away from the connecting part, and the limiting side plate is disposed on both sides of the limiting end plate along the second direction and connected to the protective part.

[0014] Optionally, the height dimension of the limiting end plate along the first direction is H, and satisfies 1.35mm≤H≤5mm.

[0015] Optionally, the cover plate body has a through hole that penetrates the connecting part and the mounting part. The conductive electrode post includes a first plate, a second plate and an intermediate post. The first plate is located on the side of the cover plate body facing the electrode group and is connected to the electrode tab of the electrode group. The second plate is located on the side of the cover plate body away from the electrode group and is connected to the tab. One end of the intermediate post is connected to the first plate, and the other end of the intermediate post passes through the through hole and is connected to the second plate.

[0016] Optionally, the second plate includes a welding part and a body part. The body part is connected to the intermediate column. The welding part is located on the side of the body part away from the intermediate column and is welded to the electrode tab. The thickness of the welding part along the first direction is T, and satisfies 1.2mm≤T≤2.2mm.

[0017] Optionally, the width dimension of the welded part along the second direction is L1, and the width dimension of the body part along the second direction is L2, and the condition 4mm≤L1-L2≤8mm is met.

[0018] Optionally, the width dimension of the cover plate body along the second direction is A, and the width dimension of the insertion through hole along the second direction is B, and satisfies 4.5mm≤(AB) / 2≤30mm.

[0019] On the other hand, a battery is provided, the battery including an electrode assembly, a battery housing and a battery cover as described in any of the preceding claims, the battery housing being a hollow housing structure having at least one opening, and the battery cover being disposed at the opening of the battery housing to close the battery housing and form a receiving cavity for accommodating the electrode assembly.

[0020] The beneficial effects of this invention are:

[0021] This invention provides a battery cover plate. The cover plate body is designed with a mounting portion, a connecting portion, and a protective portion. The lower end of the connecting portion is connected to the mounting portion, and the higher end of the connecting portion is connected to the protective portion. This arrangement ensures that the surface of the protective portion facing away from the electrode assembly is higher than the conductive electrode post. This effectively utilizes the space previously occupied by the protruding electrode post module, reducing the space occupied on the outer side of the battery cover plate and increasing the battery module assembly rate. Furthermore, the high-positioned protective portion protects the electrode post module from damage caused by impacts. Additionally, by placing the protective portion high, the space below the protective portion is expanded, allowing the electrode assembly to increase in volume and capacity. Moreover, by placing one part of the conductive electrode post on the mounting portion and another part on the connecting portion, the current-carrying area of ​​the conductive electrode post is increased, thereby improving the current-carrying capacity of the battery cover plate.

[0022] The present invention also provides a battery that, by applying the aforementioned battery cover, not only reduces the external space occupied but also expands the internal space, thereby increasing the volume of the electrode assembly and enhancing the power supply capacity. Attached Figure Description

[0023] Figure 1 This is a structural assembly diagram of the battery cover plate provided by the present invention;

[0024] Figure 2 This is an exploded view of the battery cover provided by the present invention;

[0025] Figure 3 This is a longitudinal cross-sectional view of the battery cover plate provided by the present invention;

[0026] Figure 4 This is a cross-sectional view of the battery cover provided by the present invention;

[0027] Figure 5 This is a three-dimensional structural diagram of the cover body in the battery cover provided by the present invention;

[0028] Figure 6 This is a top view of the cover body in the battery cover provided by the present invention;

[0029] Figure 7 This is a partial structural diagram of a battery using the battery cover provided by the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of the battery electrode assembly using the battery cover plate provided by the present invention.

[0031] In the picture:

[0032] 100. Electrode assembly; 101. Electrode assembly body; 1011. First mounting surface; 1012. Second mounting surface; 1013. Capacity expansion boss; 102. Electrode tab; 200. Battery casing;

[0033] 1. Cover plate body; 11. Mounting part; 12. Connecting part; 13. Protective part; 14. Limiting part; 141. Limiting end plate; 142. Limiting side plate; 15. Insertion through hole;

[0034] 2. Electrode post module; 21. Conductive electrode post; 211. First plate; 212. Second plate; 2121. Welding part; 2122. Body part; 213. Intermediate post; 22. Outer insulating component; 221. First outer insulating part; 222. Second outer insulating part; 23. Inner insulating component; 231. First inner insulating part; 232. Second inner insulating part; 233. Third inner insulating part; 24. Sealing component; 241. First sealing part; 242. Second sealing part. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0036] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0039] Because traditional battery covers have flat aluminum plates, the rivet blocks and outer insulation components on the outside of the aluminum plate protrude from the plate surface due to stacking, resulting in additional external space occupation and affecting the battery module assembly rate. On the other hand, the conductive electrode posts and inner insulation components on the other side of the aluminum plate also protrude from the plate surface, occupying internal space. This leads to low space utilization between the electrode assembly and the aluminum plate, limiting the electrode assembly volume and thus reducing battery capacity.

[0040] Therefore, in order to reduce the space occupied by the battery cover in the external and internal spaces, improve the battery module assembly rate, and increase battery capacity, this embodiment provides a battery cover. For ease of description, the height direction of the battery cover is defined as the first direction, and the width direction of the battery cover is defined as the second direction.

[0041] like Figures 1 to 6 As shown, the battery cover includes a cover body 1 and a terminal module 2. The cover body 1 includes a mounting part 11, a connecting part 12, and a protective part 13. The connecting part 12 is inclinedly disposed between the mounting part 11 and the protective part 13. The lower end of the connecting part 12 is connected to the mounting part 11, and the higher end of the connecting part 12 is connected to the protective part 13. The terminal module 2 includes a conductive electrode post 21. A part of the conductive electrode post 21 is parallel to the mounting part 11 and is insulatedly connected to the mounting part 11. The other part of the conductive electrode post 21 is parallel to the connecting part 12 and is insulatedly connected to the connecting part 12. Along the first direction, the conductive electrode post 21 is located below the surface of the protective part 13 away from the electrode assembly 100.

[0042] The battery cover is designed with a cover body 1 having a mounting part 11, a connecting part 12, and a protective part 13. The lower end of the connecting part 12 is connected to the mounting part 11, and the higher end of the connecting part 12 is connected to the protective part 13. This makes the surface of the protective part 13 away from the electrode assembly 100 higher than the conductive electrode post 21. On the one hand, the space originally occupied by the electrode post module 2 protruding from the cover body 1 is effectively utilized, reducing the space occupied on the outside of the battery cover and improving the battery module assembly rate. Furthermore, the protective part 13, located at a higher position, protects the electrode post module 2 from damage caused by bumps. On the other hand, by placing the protective part 13 at a higher position, the space below the protective part 13 is expanded, allowing the electrode assembly 100 to increase in volume and capacity by utilizing the space below the protective part 13. In addition, by placing part of the conductive electrode post 21 on the mounting part 11 and another part on the connecting part 12, the current-passing area of ​​the conductive electrode post 21 is increased, thereby improving the current-passing capacity of the battery cover.

[0043] Optionally, such as Figure 2 , Figure 3 As shown, the distance between the protective part 13 and the conductive electrode post 21 near the protective part 13 in a direction parallel to the connecting part 12 is W, and satisfies 3mm≤W≤10mm.

[0044] By limiting the distance W between the protective part 13 and the conductive electrode post 21 on the side near the protective part 13 in the direction parallel to the connecting part 12, such that 3mm≤W≤10mm, the following measures are taken: Firstly, the distance is not too small, which would cause the conductive electrode post 21 to be too close to the protective part 13 and easily damaged by impact. Secondly, since the size of the connecting part 12 is fixed, if the distance is too large, the size of the conductive electrode post 21 on the connecting part 12 will be reduced, thereby reducing the current-carrying area of ​​the conductive electrode post 21 and reducing the current-carrying capacity.

[0045] The distance W between the protective part 13 and the conductive electrode post 21 on the side near the protective part 13 in the direction parallel to the connecting part 12 can be any value between 3mm and 10mm or any two values, such as 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0046] Optionally, such as Figure 2 , Figure 3 As shown, the angle between the connecting part 12 and the mounting part 11 on the side away from the pole group 100 is N, and satisfies 100°≤N≤140°.

[0047] By limiting the included angle N between the connecting part 12 and the mounting part 11 on the side away from the pole group 100, such that it satisfies 100°≤N≤140°, on the one hand, it avoids the included angle being too small, causing the two to approach a 90° right angle, thereby reducing stress concentration at the junction of the connecting part 12 and the mounting part 11 and reducing the risk of cracking; on the other hand, it prevents the included angle from being too large, causing the height difference between the protective part 13 and the mounting part 11 to be too small, avoiding the reduction of space below the protective part 13, ensuring sufficient space for increasing the volume of the pole group 100, and ensuring the expansion effect.

[0048] The included angle N between the connecting part 12 and the mounting part 11 on the side away from the pole group 100 can be any value between 100° and 140° or any range between two values, such as 100°, 110°, 120°, 130°, 140°, etc.

[0049] Optionally, such as Figure 5 As shown, the cover plate body 1 also includes a limiting part 14. The limiting part 14 is provided on the side of the cover plate body 1 facing the pole group 100. The limiting part 14 includes a limiting end plate 141 and a limiting side plate 142. The limiting end plate 141 is connected to the side of the mounting part 11 away from the connecting part 12. The limiting side plate 142 is provided on both sides of the limiting end plate 141 along the second direction and is connected to the mounting part 11.

[0050] By providing a limiting part 14 consisting of a limiting end plate 141 and a limiting side plate 142 on the side of the mounting part 11 away from the connecting part 12, when the pole assembly 100 abuts against the mounting part 11, the limiting end plate 141 and the limiting side plate 142 can form a double limiting, effectively preventing the pole assembly 100 from being misaligned relative to the cover plate body 1.

[0051] Optionally, such as Figure 5 As shown, the cover plate body 1 also includes a limiting part 14. The limiting part 14 is provided on the side of the cover plate body 1 facing the pole group 100. The limiting part 14 includes a limiting end plate 141 and a limiting side plate 142. The limiting end plate 141 is connected to the side of the protective part 13 away from the connecting part 12. The limiting side plate 142 is provided on both sides of the limiting end plate 141 along the second direction and is connected to the protective part 13.

[0052] By providing a limiting part 14, consisting of a limiting end plate 141 and a limiting side plate 142, on the side of the protective part 13 opposite to the connecting part 12, when the pole assembly 100 abuts against the protective part 13, the limiting end plate 141 and the limiting side plate 142 form a double limiting, effectively preventing the pole assembly 100 from misaligning relative to the cover plate body 1. Furthermore, the limiting part 14 on the protective part 13 cooperates with the limiting part 14 on the mounting part 11, further improving the limiting strength of the pole assembly 100 and effectively preventing the pole assembly 100 from misaligning relative to the cover plate body 1.

[0053] Optionally, such as Figure 3 , Figure 5 As shown, the height dimension of the limiting end plate 141 along the first direction is H, and it satisfies 1.35mm≤H≤5mm.

[0054] By limiting the height H of the limiting end plate 141 along the first direction to satisfy 1.35mm≤H≤5mm, on the one hand, it avoids insufficient contact area between the limiting end plate 141 and the electrode group 100 due to insufficient height, resulting in insufficient limiting strength and reduced limiting effect; on the other hand, it prevents excessive height from occupying too much space, compressing the volume of the electrode group 100 and reducing capacity.

[0055] The height dimension H of the limiting end plate 141 along the first direction can be any value between 1.35mm and 5mm or any range between two values, such as 1.35mm, 2.08mm, 2.81mm, 3.54mm, 4.27mm, 5mm, etc.

[0056] The shape of the limiting side plate 142 can be freely set according to the requirements. In this embodiment, in order to take into account both the limiting effect and space occupation of the limiting side plate 142, the limiting side plate 142 is a right triangle, and its two right-angled sides are connected to the limiting end plate 141 and the cover plate body 1 respectively.

[0057] In this embodiment, to verify the impact of the above parameter limitations on the battery cover provided in this embodiment, as shown in Table 1, six sets of embodiments and six sets of comparative examples are provided for verification.

[0058] Table 1

[0059]

[0060] A comparison of Examples 1 to 6 with Comparative Examples 1 to 2 shows that when the distance W between the protective part 13 and the conductive electrode post 21 near the protective part 13 in a direction parallel to the connecting part 12 is less than the minimum value of 3mm≤W≤10mm, the conductive electrode post 21 is too close to the protective part 13, and the conductive electrode post 21 is easily damaged by impact. When the distance W between the protective part 13 and the conductive electrode post 21 near the protective part 13 in a direction parallel to the connecting part 12 is greater than the maximum value of 3mm≤W≤10mm, the current-carrying area of ​​the conductive electrode post 21 is small and the current-carrying capacity is poor.

[0061] A comparison of Examples 1 to 6 with Comparative Examples 3 to 4 shows that when the angle N between the connecting part 12 and the mounting part 11 on the side away from the pole group 100 is less than the minimum value of the range 100°≤N≤140°, stress concentration occurs at the junction of the connecting part 12 and the mounting part 11, making it prone to cracking. When the angle N between the connecting part 12 and the mounting part 11 on the side away from the pole group 100 is greater than the maximum value of the range 100°≤N≤140°, the height difference between the protective part 13 and the mounting part 11 is too small, the space below the protective part 13 is small, and the pole group 100 has a small volume and low capacity.

[0062] A comparison of Examples 1 to 6 with Comparative Examples 5 to 6 shows that when the height H of the limiting end plate 141 along the first direction is less than the minimum value of the range 1.35mm≤H≤5mm, the contact area between the limiting end plate 141 and the electrode group 100 is insufficient, resulting in insufficient limiting strength and poor limiting effect. When the height H of the limiting end plate 141 along the first direction is greater than the maximum value of the range 1.35mm≤H≤5mm, the limiting end plate 141 occupies too much space, and the electrode group 100 has a small volume and low capacity.

[0063] Optionally, such as Figure 2 As shown, the cover plate body 1 has a through hole 15 that passes through the connecting part 12 and the mounting part 11. The conductive electrode post 21 includes a first plate 211, a second plate 212 and an intermediate post 213. The first plate 211 is located on the side of the cover plate body 1 facing the electrode group 100 and is connected to the electrode tab 102 of the electrode group 100. The second plate 212 is located on the side of the cover plate body 1 away from the electrode group 100 and is connected to the electrode plate. One end of the intermediate post 213 is connected to the first plate 211 and the other end of the intermediate post 213 passes through the through hole 15 and is connected to the second plate 212.

[0064] In traditional battery covers, the electrode module 2 typically includes a conductive electrode post 21 and a riveting block welded to the battery plate. The conductive electrode post 21 is connected to the cover body 1 by riveting with the riveting block, and is also connected to the battery plate through the riveting block. However, this embodiment designs the conductive electrode post 21, which is composed of a first plate 211 connected to the tab 102, a second plate 212 connected to the battery plate, and an intermediate post 213. This not only eliminates the need for the traditional riveting block welded to the battery plate, reducing the number of components, but also enables direct current conduction between the conductive electrode post 21 and the battery plate without the need for indirect connection through the traditional riveting block, thereby reducing internal resistance and improving performance.

[0065] In this embodiment, the second plate 212 welded to the electrode plate is formed by riveting and flanging the conductive electrode post 21. This not only achieves the connection between the conductive electrode post 21 and the cover plate body 1, but also increases the area of ​​the conductive electrode post 21 for welding with the electrode plate. In this embodiment, the electrode post module 2 also includes an outer insulating component 22, an inner insulating component 23, and a sealing component 24. The outer insulating component 22 is sleeved on the body portion 2122 of the second plate 212 and includes a first outer insulating portion 221 and a second outer insulating portion 222. The second outer insulating portion 222 is connected to the side of the first outer insulating portion 221 near the connecting portion 12. The first outer insulating portion 221 is located between the second plate 212 and the mounting portion 11, and the second outer insulating portion 222 is located between the second plate 212 and the connecting portion 12. Thus, the outer insulating component 22 provides insulation protection for the outside of the cover plate body 1. The inner insulating component 23 includes a first inner insulating part 231, a second inner insulating part 232, and a third inner insulating part 233. The first inner insulating part 231 is disposed between the mounting part 11 and the first plate 211, the second inner insulating part 232 is disposed between the connecting part 12 and the first plate 211, and the third inner insulating part 233 is attached to the side of the protective part 13 facing the electrode group 100. Thus, the inner insulating component 23 is used to achieve insulation protection for the inner side of the cover plate body 1. The sealing component 24 is sleeved on the intermediate column 213 and includes a first sealing part 241 and a second sealing part 242. The first sealing part 241 is sandwiched between the intermediate column 213 and the mounting part 11, and the second sealing part 242 is sandwiched between the intermediate column 213 and the connecting part 12. The sealing component 24 achieves a seal between the intermediate column 213 and the cover plate body 1, preventing electrolyte leakage. In order to increase the current-conducting area of ​​the conductive electrode post 21, both the first plate 211 and the second plate 212 are elliptical.

[0066] Optionally, such as Figure 3 , Figure 4 As shown, the second plate 212 includes a welding part 2121 and a body part 2122. The body part 2122 is connected to the intermediate column 213. The welding part 2121 is located on the side of the body part 2122 away from the intermediate column 213 and is welded to the plate. The thickness of the welding part 2121 along the first direction is T, and satisfies 1.2mm≤T≤2.2mm.

[0067] The welding part 2121 of the second plate 212 is formed by riveting and flanging process. In addition to being responsible for welding with the electrode plate for flow conduction, it is also used to connect the conductive electrode post 21 and the cover plate body 1. Therefore, by limiting the thickness T of the welding part 2121 along the first direction, so that it satisfies 1.2mm≤T≤2.2mm, on the one hand, it avoids that the thickness of the welding part 2121 is too small, resulting in poor connection strength between the conductive electrode post 21 and the cover plate body 1, which is easy to loosen. On the other hand, it avoids that the thickness of the welding part 2121 is too large, resulting in large internal resistance during flow conduction.

[0068] The thickness T of the welded part 2121 along the first direction can be any value between 1.2mm and 2.2mm or any range between two values, such as 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, etc.

[0069] Optionally, such as Figure 4 As shown, the width dimension of the welding part 2121 along the second direction is L1, and the width dimension of the body part 2122 along the second direction is L2, and both satisfy 4mm≤L1-L2≤8mm.

[0070] Since the welding part 2121 is formed by riveting and flanging, the difference between the width dimension L1 of the welding part 2121 along the second direction and the width dimension L2 of the body part 2122 along the second direction is limited. In essence, this limits the width of the part of the welding part 2121 that contacts the cover plate body 1 after flanging, so that it satisfies 4mm≤L1-L2≤8mm. This avoids the width being too small, resulting in insufficient contact area between the welding part 2121 and the cover plate body 1 and poor connection strength. On the other hand, it avoids the width being too large, resulting in the welding part 2121 being too close to the edge of the cover plate body 1 and easily damaged by bumps.

[0071] The difference between the width dimension L1 of the welding part 2121 along the second direction and the width dimension L2 of the body part 2122 along the second direction can be any value between 4mm and 8mm or any range between two values, such as 4mm, 5mm, 6mm, 7mm, 8mm, etc.

[0072] Optionally, such as Figure 6 As shown, the width dimension of the cover plate body 1 along the second direction is A, and the width dimension of the insertion through hole 15 along the second direction is B, and satisfies 4.5mm≤(AB) / 2≤30mm.

[0073] By limiting the relationship between the width dimension A of the cover plate body 1 along the second direction and the width dimension B of the insertion through hole 15 along the second direction, the relationship between the two is made to satisfy 4.5mm≤(AB) / 2≤30mm. This avoids, on the one hand, the width of the remaining material after the insertion through hole 15 is opened in the cover plate body 1 being too small, resulting in poor structural strength of the cover plate body 1 and easy cracking. On the other hand, it avoids the width of the remaining material after the insertion through hole 15 is opened in the cover plate body 1 being too large, resulting in the width of the insertion through hole 15 being too small under the premise that the size of the cover plate body 1 is fixed, thereby increasing the assembly difficulty of the cover plate body 1 and the conductive electrode post 21.

[0074] The relationship between the width dimension A of the cover plate body 1 along the second direction and the width dimension B of the insertion through hole 15 along the second direction can be any value between 4.5mm and 30mm or any range between two values, such as 4.5mm, 9.6mm, 14.7mm, 19.8mm, 24.9mm, 30mm, etc.

[0075] In this embodiment, in order to verify the impact of the various parameter limitations of the conductive electrode post 21 on the battery cover provided in this embodiment, as shown in Table 2, six sets of embodiments and six sets of comparative examples are provided for verification.

[0076] Table 2

[0077]

[0078] A comparison of Examples 7 to 12 with Comparative Examples 7 to 8 shows that when the thickness T of the second plate 212 along the first direction is less than the minimum value of the range 1.2mm≤T≤2.2mm, the thickness of the second plate 212 is too small, resulting in poor connection strength between the conductive electrode post 21 and the cover plate body 1, making it prone to loosening. When the thickness T of the second plate 212 along the first direction is greater than the maximum value of the range 1.2mm≤T≤2.2mm, the thickness of the second plate 212 is too large, resulting in high internal resistance during current conduction.

[0079] A comparison of Examples 7 to 12 with Comparative Examples 9 to 10 shows that when the difference between the width dimension L1 of the second plate 212 along the second direction and the width dimension L2 of the body portion 2122 along the second direction is less than the minimum value of the range 4mm≤L1-L2≤8mm, the width is too small, resulting in insufficient contact area between the second plate 212 and the cover plate body 1, and poor connection strength. When the difference between the width dimension L1 of the second plate 212 along the second direction and the width dimension L2 of the body portion 2122 along the second direction is greater than the maximum value of the range 4mm≤L1-L2≤8mm, the width is too large, resulting in the second plate 212 being too close to the edge of the cover plate body 1, and easily damaged by impact.

[0080] A comparison of Examples 7 to 12 with Comparative Examples 11 to 12 reveals that when the relationship between the width dimension A of the cover plate body 1 along the second direction and the width dimension B of the insertion through hole 15 along the second direction is less than the minimum value of 4.5mm ≤ (AB) / 2 ≤ 30mm, the width of the remaining material after the insertion through hole 15 is too small, resulting in poor structural strength of the cover plate body 1 and easy cracking. When the relationship between the width dimension A of the cover plate body 1 along the second direction and the width dimension B of the insertion through hole 15 along the second direction is greater than the maximum value of 4.5mm ≤ (AB) / 2 ≤ 30mm, the width of the remaining material after the insertion through hole 15 is too large, resulting in a small width of the insertion through hole 15 under the premise that the size of the cover plate body 1 is fixed, thereby increasing the assembly difficulty of the cover plate body 1 and the conductive electrode post 21.

[0081] In this embodiment, as Figure 7 , Figure 8 As shown, a battery is also provided, which includes an electrode assembly 100, a battery housing 200 and the aforementioned battery cover plate. The battery housing 200 is a hollow housing structure with at least one opening. The battery cover plate is disposed at the opening of the battery housing 200 to close the battery housing 200 and form a receiving cavity for accommodating the electrode assembly 100.

[0082] By applying the aforementioned battery cover, the battery not only reduces the external space occupied but also expands the internal space, increasing the volume of the electrode assembly 100 and thus enhancing its power supply capacity.

[0083] To accommodate the battery cover provided in this embodiment, the shape of the battery housing 200 is adapted to the shape of the battery cover, such as... Figure 8 As shown, the electrode assembly 100 includes an electrode assembly body 101 and electrode tabs 102. The electrode assembly body 101 includes a first mounting surface 1011 corresponding to the mounting portion 11, a second mounting surface 1012 corresponding to the connecting portion 12, and an expansion boss 1013 located below the protective portion 13. Both the first mounting surface 1011 and the second mounting surface 1012 are provided with electrode tabs 102 connected to the conductive electrode post 21. By providing the expansion boss 1013 corresponding to the protective portion 13 on the electrode assembly body 101, the volume of the electrode assembly body 101 is increased, thereby increasing the capacity. Furthermore, by providing electrode tabs 102 on both the first mounting surface 1011 and the second mounting surface 1012, a multi-tab structure is formed, which increases the current carrying capacity and reduces the temperature rise.

[0084] In this embodiment, the battery is a blade battery. Since the blade battery has a structure with tabs 102 on both sides of the electrode group 100, it is provided with two battery covers. Therefore, two types of blade batteries can be derived by combining the battery covers provided in this embodiment. One type is where both battery covers are of the type provided in this embodiment, and the other type is where one of the two battery covers is of the type provided in this embodiment, and the other is still a traditional type of battery cover.

[0085] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery cover, characterized in that, The battery cover includes: The cover plate body includes a mounting part, a connecting part, and a protective part. The connecting part is inclinedly disposed between the mounting part and the protective part. The lower end of the connecting part is connected to the mounting part, and the higher end of the connecting part is connected to the protective part. An electrode module includes conductive electrode posts, a portion of which is parallel to the mounting portion and insulatedly connected to the mounting portion, and another portion of which is parallel to the connecting portion and insulatedly connected to the connecting portion. Along a first direction, the conductive electrode posts are located below the surface of the protective portion away from the electrode assembly. The first direction is the height direction of the battery cover, and the second direction is the width direction of the battery cover; The distance between the protective part and the side of the conductive electrode post closest to the protective part along the direction parallel to the connecting part is W, and satisfies 3mm≤W≤10mm; The angle between the connecting part and the mounting part on the side away from the pole group is N, and satisfies 100°≤N≤140°; The cover plate body also includes a limiting part, which is disposed on the side of the cover plate body facing the pole group. The limiting part includes a limiting end plate and a limiting side plate. The limiting end plate is connected to the side of the mounting portion away from the connecting portion, and the limiting side plate is disposed on both sides of the limiting end plate along the second direction and connected to the mounting portion; and / or, the limiting end plate is connected to the side of the protective portion away from the connecting portion, and the limiting side plate is disposed on both sides of the limiting end plate along the second direction and connected to the protective portion; The height dimension of the limiting end plate along the first direction is H, and it satisfies 1.35mm≤H≤5mm.

2. The battery cover according to claim 1, characterized in that, The cover plate body has a through hole that passes through the connecting part and the mounting part. The conductive electrode post includes a first plate, a second plate and an intermediate post. The first plate is located on the side of the cover plate body facing the electrode group and is connected to the electrode lug of the electrode group. The second plate is located on the side of the cover plate body away from the electrode group and is connected to the electrode plate. One end of the intermediate post is connected to the first plate and the other end of the intermediate post passes through the through hole and is connected to the second plate.

3. The battery cover according to claim 2, characterized in that, The second plate includes a welding part and a body part. The body part is connected to the intermediate column. The welding part is located on the side of the body part away from the intermediate column and is welded to the plate. The thickness of the welding part along the first direction is T, and satisfies 1.2mm≤T≤2.2mm.

4. The battery cover according to claim 3, characterized in that, The width dimension of the welded part along the second direction is L1, and the width dimension of the body part along the second direction is L2, and both satisfy 4mm≤L1-L2≤8mm.

5. The battery cover according to claim 2, characterized in that, The width dimension of the cover plate body along the second direction is A, and the width dimension of the insertion through hole along the second direction is B, and both satisfy 4.5mm≤(AB) / 2≤30mm.

6. A battery, characterized in that, The battery includes an electrode assembly, a battery casing, and a battery cover as described in any one of claims 1-5. The battery casing is a hollow casing structure with at least one opening. The battery cover is disposed at the opening of the battery casing to close the battery casing and form a receiving cavity for accommodating the electrode assembly.

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