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 and a pole column module. The installation plate body of the cover plate body is connected with a first expansion plate body and a second expansion plate body on both sides. The first expansion plate body is connected with the installation plate body at one end of the inclined first connecting part and connected with the first expansion part which is higher than the installation plate body at the other end. The second expansion plate body is connected with the installation plate body at one end of the inclined second connecting part and connected with the second expansion part which is lower than the installation plate body at the other end. The pole column module is insulatedly connected with the installation plate body, and the protruding part of the pole column module outside the cover plate body is lower than the first expansion part. The high-low staggered structure is formed to increase the contact area with the pole group and limit the position, thereby stabilizing the position of the pole group. The first expansion part is higher than the installation plate body, thereby avoiding the protruding part of the pole column module from exceeding, reducing the space occupation on the outside, improving the grouping rate, protecting the pole column module, improving the space utilization rate of the pole group and the cover plate body, and increasing the volume of the pole group and the capacity of the battery.

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 battery modules and increases the assembly rate of battery modules, but also improves the utilization rate of internal space, increases the volume of electrode groups, and enhances 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 plate, a first expansion plate, and a second expansion plate. The first expansion plate includes a first connecting portion and a first expansion portion. The first connecting portion is inclined. One end of the first connecting portion is connected to the mounting plate, and the other end of the first connecting portion is connected to a first expansion portion that is higher than the mounting plate. The second expansion plate includes a second connecting portion and a second expansion portion. The second connecting portion is inclined. One end of the second connecting portion is connected to the mounting plate, and the other end of the second connecting portion is connected to a second expansion portion that is lower than the mounting plate.

[0009] The pole module is insulated from the mounting plate, and the portion of the pole module extending beyond the outer side of the mounting plate is lower than the first extension portion.

[0010] Optionally, the pole module includes a riveting block, which is insulatedly connected to the side of the cover plate body away from the pole assembly. The riveting block includes a riveting portion, a first extension portion, and a second extension portion. The riveting portion abuts against the mounting plate. The first extension portion is located on the side of the riveting portion near the first expansion plate and abuts against the first connecting portion. The second extension portion is located on the side of the riveting portion near the second expansion plate and abuts against the second connecting portion.

[0011] Optionally, the length of the riveting portion along the first direction is L1, the length of the first extension portion along the direction parallel to the first connecting portion is L2, and the length of the second extension portion along the direction parallel to the second connecting portion is L3, and satisfies 0.3≤(L2+L3) / L1≤0.55.

[0012] Optionally, the electrode module further includes a conductive electrode post, which includes a column portion and a plate portion. The plate portion is located on the side of the mounting plate facing the electrode assembly. One end of the column portion is connected to the plate portion, and the other end of the column portion passes through the mounting plate and is riveted to the riveting portion. The cross-section of the column portion is elliptical, and the major axis dimension of the column portion along the first direction is E, which satisfies 0.35≤E / L1≤0.55.

[0013] Optionally, the pole module further includes an external insulating component, which includes a first external insulating portion and a second external insulating portion. The second external insulating portion is disposed on both sides of the first external insulating portion along a first direction. The first external insulating portion is disposed between the riveting portion and the mounting plate. The second external insulating portion is also disposed between the first extension portion and the first connecting portion, and between the second extension portion and the second connecting portion.

[0014] Optionally, the cover plate body further includes limiting ribs. The first connecting portion and the second connecting portion are each provided with two limiting ribs spaced apart along a third direction on the side facing the pole group. The pole module further includes an inner insulating component. The inner insulating component includes a first inner insulating portion, a second inner insulating portion, and a third inner insulating portion. The second inner insulating portion is provided on both sides of the first inner insulating portion along a first direction. The third inner insulating portion is provided on the side of the second inner insulating portion away from the first inner insulating portion. The first inner insulating portion abuts against the side of the mounting plate facing the pole group. The first connecting portion and the second connecting portion are each provided with abutting second inner insulating portion on the side facing the pole group. The second inner insulating portion is located between the corresponding two limiting ribs. The first extension portion and the second extension portion are each provided with abutting third inner insulating portion on the side facing the pole group.

[0015] Optionally, the thickness of the limiting rib along the third direction is T1, and the width of the limiting rib along the direction perpendicular to the second inner insulation part is B, satisfying 0.7mm. 2 ≤T1×B≤3.24mm 2 .

[0016] Optionally, the distance between the surface of the first extension portion away from the electrode group and the surface of the mounting plate away from the electrode group along the second direction is H1, and the distance between the surface of the second extension portion away from the electrode group and the surface of the mounting plate away from the electrode group along the second direction is H2, and satisfies 22mm≤H1+H2≤50mm.

[0017] Optionally, the length of the first extension portion along the first direction is W1, and the length of the second extension portion along the first direction is W2, and the length satisfies 10mm≤W1-W2≤80mm.

[0018] 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.

[0019] The beneficial effects of this invention are:

[0020] This invention provides a battery cover, comprising a cover body and an electrode module insulatedly connected to the cover body. On one hand, by providing a first extension plate composed of a first connecting portion and a first extension portion on the cover body, with the first connecting portion inclined relative to a mounting plate, making the height of the first extension portion higher than the mounting plate; and on the other hand, by providing a second extension plate composed of a second connecting portion and a second extension portion on the cover body, with the second connecting portion inclined relative to the mounting plate, making the height of the mounting plate higher than the second extension portion, the alternating height structure not only increases the contact area between the battery cover and the electrode assembly, but also utilizes the inclined first and second connecting portions to achieve… The limiting of the electrode assembly ensures the stability of the relative position between the electrode assembly and the battery cover. On the other hand, since the height of the first extension is higher than that of the mounting plate, it prevents the part of the electrode module located outside the mounting plate from exceeding the first extension. This effectively utilizes the space originally occupied by the electrode module protruding from the mounting plate, reduces the space occupied outside the battery cover, improves the battery module assembly rate, and provides protection for the electrode module through the first extension to avoid damage caused by bumps. Furthermore, since the first extension is higher than the mounting plate, the electrode assembly can utilize the space below the first extension to improve the space utilization between the electrode assembly and the cover body, increase the electrode assembly volume, and improve the battery capacity.

[0021] 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

[0022] Figure 1 This is a schematic diagram of the top structure of the battery cover provided by the present invention;

[0023] Figure 2 This is a schematic diagram of the bottom structure of the battery cover provided by the present invention;

[0024] Figure 3 This is a cross-sectional view of the battery cover provided by the present invention;

[0025] Figure 4 This is a cross-sectional view of the first connecting portion in the battery cover provided by the present invention;

[0026] Figure 5 This is a partial structural diagram of a battery using the aforementioned battery cover provided by the present invention;

[0027] Figure 6 This is a partial structural cross-sectional view of a battery using the aforementioned battery cover plate provided by the present invention.

[0028] In the picture:

[0029] 100, electrode assembly; 101, protrusion; 200, battery casing;

[0030] 1. Cover plate body; 11. Mounting plate body; 12. First expansion plate body; 121. First connecting part; 122. First expansion part; 13. Second expansion plate body; 131. Second connecting part; 132. Second expansion part; 14. Limiting rib plate; 15. Insertion protrusion;

[0031] 2. Electrode post module; 21. Riveting block; 211. Riveting part; 212. First extension part; 213. Second extension part; 22. Conductive electrode post; 221. Post part; 222. Plate part; 23. Outer insulating part; 231. First outer insulating part; 232. Second outer insulating part; 24. Inner insulating part; 241. First inner insulating part; 242. Second inner insulating part; 243. Third inner insulating part. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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 length direction of the battery cover is defined as the first direction, the thickness direction of the battery cover is defined as the second direction, and the width direction of the battery cover is defined as the third direction.

[0038] 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 plate 11, a first extension plate 12, and a second extension plate 13. The first extension plate 12 includes a first connecting portion 121 and a first extension portion 122. The first connecting portion 121 is inclined. One end of the first connecting portion 121 is connected to the mounting plate 11, and the other end of the first connecting portion 121 is connected to the first extension portion 122, which is higher than the mounting plate 11. The second extension plate 13 includes a second connecting portion 131 and a second extension portion 132. The second connecting portion 131 is inclined. One end of the second connecting portion 131 is connected to the mounting plate 11, and the other end of the second connecting portion 131 is connected to the second extension portion 132, which is lower than the mounting plate 11. The terminal module 2 is insulated from the mounting plate 11. The portion of the terminal module 2 located outside the mounting plate 11 is lower than the height of the first extension portion 122.

[0039] The battery cover includes a cover body 1 and an electrode module 2 insulatedly connected to the cover body 1. On one hand, a first extension plate 12, consisting of a first connecting portion 121 and a first extension portion 122, is provided on the cover body 1, with the first connecting portion 121 inclined relative to the mounting plate 11, making the height of the first extension portion 122 higher than the mounting plate 11. On the other hand, a second extension plate 13, consisting of a second connecting portion 131 and a second extension portion 132, is provided on the cover body 1, with the second connecting portion 131 inclined relative to the mounting plate 11, making the height of the mounting plate 11 higher than the second extension portion 132. This staggered structure not only increases the contact area between the battery cover and the electrode assembly 100, but also utilizes the inclined first connecting portion 121 and second connecting portion 131 to achieve proper connection between the electrode assembly and the battery cover. The limiting position of 100 ensures the stability of the relative position between the electrode assembly 100 and the battery cover. On the other hand, since the height of the first extension 122 is higher than that of the mounting plate 11, the portion of the electrode module 2 located outside the mounting plate 11 is prevented from exceeding the first extension 122. This effectively utilizes the space originally occupied by the electrode module 2 protruding from the mounting plate 11, reduces the space occupied outside the battery cover, and improves the battery module assembly rate. Furthermore, the first extension 122 provides protection for the electrode module 2, preventing damage caused by bumps. Since the first extension 122 is higher than the mounting plate 11, the electrode assembly 100 can utilize the space below the first extension 122 to improve the space utilization between the electrode assembly 100 and the cover body 1, thereby increasing the volume of the electrode assembly 100 and improving the battery capacity.

[0040] Optionally, such as Figure 3 As shown, the pole module 2 includes a riveting block 21, which is insulatedly connected to the side of the cover plate body 1 away from the pole group 100. The riveting block 21 includes a riveting part 211, a first extension part 212, and a second extension part 213. The riveting part 211 abuts against the mounting plate body 11. The first extension part 212 is located on the side of the riveting part 211 near the first expansion plate body 12 and abuts against the first connecting part 121. The second extension part 213 is located on the side of the riveting part 211 near the second expansion plate body 13 and abuts against the second connecting part 131.

[0041] By designing a riveting block 21 consisting of a riveting portion 211, a first extension portion 212, and a second extension portion 213, the weldable area of ​​the riveting block 21 is increased, thereby improving the current carrying capacity of the battery cover. In this embodiment, the riveting portion 211 is parallel to the mounting plate 11, the first extension portion 212 is parallel to the first connecting portion 121, and the second extension portion 213 is parallel to the second connecting portion 131, thereby ensuring a tight fit between the riveting block 21 and the cover body 1.

[0042] Optionally, such as Figure 3As shown, the length of the riveting part 211 along the first direction is L1, the length of the first extension part 212 along the direction parallel to the first connecting part 121 is L2, and the length of the second extension part 213 along the direction parallel to the second connecting part 131 is L3, and satisfies 0.3≤(L2+L3) / L1≤0.55.

[0043] By limiting the ratio between the sum of the length L2 of the first extension 212 in the direction parallel to the first connecting portion 121 and the length L3 of the second extension 213 in the direction parallel to the second connecting portion 131 and the length L1 of the riveting portion 211 in the first direction, such that it satisfies 0.3≤(L2+L3) / L1≤0.55, on the one hand, it avoids the sum of the length L2 and the length L3 being too small relative to the length L1, which would result in the sum of the first extension 212 and the second extension 213 used to increase the welding area of ​​the riveting block 21 being too small, thereby reducing the current carrying capacity of the battery cover. On the other hand, it avoids the sum of the length L2 and the length L3 being too large relative to the length L1, which would result in the size of the riveting portion 211 being reduced and the riveting difficulty increasing.

[0044] The ratio between the sum of the length L2 of the first extension 212 in the direction parallel to the first connecting portion 121 and the length L3 of the second extension 213 in the direction parallel to the second connecting portion 131, and the length L1 of the riveting portion 211 in the first direction, can be any value between 0.3 and 0.55, or a range between any two values, such as 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, etc.

[0045] Optionally, such as Figure 1 , Figure 3 As shown, the electrode module 2 also includes a conductive electrode post 22. The conductive electrode post 22 includes a column portion 221 and a plate portion 222. The plate portion 222 is located on the side of the mounting plate 11 facing the electrode group 100. One end of the column portion 221 is connected to the plate portion 222, and the other end of the column portion 221 passes through the mounting plate 11 and is riveted to the riveting portion 211. The cross-section of the column portion 221 is elliptical, and the major axis dimension of the column portion 221 along the first direction is E, which satisfies 0.35≤E / L1≤0.55.

[0046] By setting the cross-section of the column portion 221 to an elliptical shape, the contact area between the column portion 221 and the riveting block 21 is increased. This improves the connection strength and increases the flow area of ​​the column portion 221, thereby enhancing the flow capacity. Furthermore, by limiting the ratio between the major axis dimension E of the column portion 221 along the first direction and the length dimension L1 of the riveting portion 211 along the first direction, such that it satisfies 0.35≤E / L1≤0.55, the following measures are taken: firstly, the major axis of the column portion 221 is not too small relative to the length of the riveting portion 211, which would reduce the flow capacity of the column portion 221; secondly, the major axis dimension E of the column portion 221 is not too large relative to the length of the riveting portion 211, which would reduce the area of ​​the riveting block 21 used for welding the brace and result in insufficient welding strength and flow capacity between the riveting block 21 and the brace.

[0047] The ratio between the major axis dimension E of the column portion 221 along the first direction and the length dimension L1 of the riveting portion 211 along the first direction can be any value between 0.35 and 0.55 or any range between two values, such as 0.35, 0.4, 0.45, 0.5, 0.55, etc.

[0048] In this embodiment, in order to verify the effect of the above parameter limitations on the battery cover provided in this embodiment, as shown in Table 1, six sets of embodiments and four sets of comparative examples are provided for verification.

[0049] Table 1

[0050]

[0051] A comparison of Examples 1 to 6 with Comparative Examples 1 to 2 reveals that when the sum of the length L2 of the first extension 212 in the direction parallel to the first connecting portion 121 and the length L3 of the second extension 213 in the direction parallel to the second connecting portion 131, and the length L1 of the riveting portion 211 in the first direction, is less than the minimum value of 0.3 ≤ (L2 + L3) / L1 ≤ 0.55, the sum of length L2 and length L3 is too small relative to length L1, resulting in the first extension 212 used to increase the welding area of ​​the riveting block 21 being too small. If the sum of the lengths of the first extension 212 and the second extension 213 is too small, the current carrying capacity of the battery cover will be reduced. When the ratio between the sum of the length L2 of the first extension 212 in the direction parallel to the first connecting part 121 and the length L3 of the second extension 213 in the direction parallel to the second connecting part 131 and the length L1 of the riveting part 211 in the first direction is greater than the maximum value of 0.3≤(L2+L3) / L1≤0.55, the sum of the lengths L2 and L3 is too large relative to the length L1, which will cause the size of the riveting part 211 to shrink and increase the difficulty of riveting.

[0052] A comparison of Examples 1 to 6 with Comparative Examples 3 to 4 reveals that when the ratio between the major axis dimension E of the column portion 221 along the first direction and the length dimension L1 of the riveting portion 211 along the first direction is less than the minimum value of 0.35 ≤ E / L1 ≤ 0.55, the major axis of the column portion 221 is too small relative to the length of the riveting portion 211, resulting in a reduction in the flow capacity of the column portion 221. Conversely, when the ratio between the major axis dimension E of the column portion 221 along the first direction and the length dimension L1 of the riveting portion 211 along the first direction is greater than the maximum value of 0.35 ≤ E / L1 ≤ 0.55, the major axis dimension E of the column portion 221 is too large relative to the length of the riveting portion 211, thereby reducing the area of ​​the riveting block 21 used for welding the brace, resulting in insufficient welding strength and flow capacity between the riveting block 21 and the brace.

[0053] Optionally, such as Figure 3 As shown, the pole module 2 also includes an outer insulating component 23. The outer insulating component 23 includes a first outer insulating part 231 and a second outer insulating part 232. The second outer insulating part 232 is disposed on both sides of the first outer insulating part 231 along the first direction. The first outer insulating part 231 is disposed between the riveting part 211 and the mounting plate 11. The second outer insulating part 232 is disposed between the first extension part 212 and the first connecting part 121 and between the second extension part 213 and the second connecting part 131.

[0054] By designing an outer insulating member 23 with a first outer insulating part 231 and a second outer insulating part 232, the rivet block 21 and the cover plate body 1 are insulated and protected by the outer insulating member 23, thus avoiding direct contact between the rivet block 21 and the cover plate body 1, which could lead to a short circuit.

[0055] Optionally, such as Figure 2 , Figure 3 As shown, the cover plate body 1 also includes limiting ribs 14. Two limiting ribs 14 are provided on the side of the first connecting portion 121 and the second connecting portion 131 facing the pole assembly 100, spaced apart along a third direction. The pole post module 2 also includes an inner insulating component 24, which includes a first inner insulating portion 241, a second inner insulating portion 242, and a third inner insulating portion 243. The second inner insulating portion 242 is located on both sides of the first inner insulating portion 241 along a first direction, and the third inner insulating portion 243 is located on the second inner insulating portion 241 along a first direction. The inner insulation portion 242 is located away from the side of the first inner insulation portion 241. The first inner insulation portion 241 abuts against the side of the mounting plate 11 facing the pole group 100. The first connecting portion 121 and the second connecting portion 131 are both provided with abutting second inner insulation portions 242 on the side facing the pole group 100. The second inner insulation portions 242 are located between the corresponding two limiting ribs 14. The first extension portion 122 and the second extension portion 132 are both provided with abutting third inner insulation portions 243 on the side facing the pole group 100.

[0056] By designing an inner insulating member 24 with a first inner insulating part 241, a second inner insulating part 242, and a third inner insulating part 243, insulation protection is ensured on the side of the cover plate body 1 facing the pole group 100, avoiding direct contact with the cover plate body 1 and preventing short circuits. Furthermore, by providing limiting ribs 14 on the side of the first connecting part 121 and the second connecting part 131 facing the pole group 100, and placing the second inner insulating part 242 between the two limiting ribs 14, the inner insulating member 24 is limited, preventing the inner insulating member 24 from being exposed due to misalignment, thus avoiding the risk of short circuits.

[0057] In this embodiment, the first inner insulation portion 241 is located between the plate portion 222 of the conductive electrode post 22 and the mounting plate 11. The column portion 221 of the conductive electrode post 22 passes through the first inner insulation portion 241 of the inner insulation member 24, the mounting plate 11 of the cover body 1, and the first outer insulation portion 231 of the outer insulation member 23 and is riveted to the riveting portion 211 of the riveting block 21. In order to ensure the sealing of the battery cover, the electrode module 2 also includes a sealing member, which is sleeved on the outside of the column portion 221 to achieve sealing.

[0058] It can be seen that the portion of the pole module 2 that extends beyond the outer side of the mounting plate 11 of the cover body 1 is the total height of the rivet block 21 and the outer insulating component 23. The projection of the rivet block 21 and the outer insulating component 23 on the cover body 1 does not exceed the cover body 1, thereby avoiding damage in the event of an impact. In addition, the mounting plate 11 is provided with a pole through hole for the insertion of the pole part 221.

[0059] Optionally, such as Figure 3 , Figure 4 As shown, the thickness of the limiting rib 14 along the third direction is T1, and the width of the limiting rib 14 along the direction perpendicular to the second inner insulation part 242 is B, and satisfies 0.7mm. 2 ≤T1×B≤3.24mm 2 .

[0060] By limiting the product of the thickness T1 of the limiting rib 14 along a third direction and the width B of the limiting rib 14 along the direction perpendicular to the second inner insulation portion 242, the cross-sectional size of the limiting rib 14 is limited, thereby satisfying 0.7mm. 2 ≤T1×B≤3.24mm 2This avoids two problems. On the one hand, it prevents the cross-sectional area of ​​the limiting rib plate 14 from being too small, resulting in weak structural strength of the limiting rib plate 14. This would make it easy for the inner insulating part 24 to be unable to be effectively fixed due to deformation, which would make the inner insulating part 24 easy to move and expose the cover plate body 1, posing a risk of short circuit. On the other hand, it avoids the cross-sectional area of ​​the limiting rib plate 14 from being too large, resulting in too little space between the two limiting rib plates 14 to accommodate the second inner insulating part 242, which would make assembly difficult.

[0061] The product of the thickness T1 of the limiting rib 14 along the third direction and the width B of the limiting rib 14 along the direction perpendicular to the second inner insulation portion 242 can be 0.7mm. 2 Up to 3.24mm 2 Any value between or between any two values, for example, 0.7mm. 2 1.335mm 2 1.97mm 2 2.605mm 2 3.24mm 2 wait.

[0062] Optionally, such as Figure 3 As shown, the distance between the surface of the first extension part 122 away from the electrode group 100 and the surface of the mounting plate 11 away from the electrode group 100 along the second direction is H1, and the distance between the surface of the second extension part 132 away from the electrode group 100 and the surface of the mounting plate 11 away from the electrode group 100 along the second direction is H2, and satisfies 22mm≤H1+H2≤50mm.

[0063] By limiting the sum of the distance H1 between the surface of the first extension section 122 away from the electrode assembly 100 and the surface of the mounting plate 11 away from the electrode assembly 100 along the second direction and the distance H2 between the surface of the second extension section 132 away from the electrode assembly 100 and the surface of the mounting plate 11 away from the electrode assembly 100 along the second direction, ensuring that 22mm≤H1+H2≤50mm, this avoids the height difference between the first extension section 122 and the second extension section 132 being too small, thus preventing the distance between the first extension section 122 and the second extension section 132 along the second direction from being too close. This will compress the dimensions of the first connecting portion 121 and the second connecting portion 131, thereby making the dimensions of the first extension portion 212 and the second extension portion 213 of the riveting block 21 too small, thus reducing the area of ​​the riveting block 21 used for welding, reducing the current carrying capacity, and also compressing the space below the first extension portion 122, resulting in insufficient space for adding the electrode group 100, and limited improvement in battery capacity. On the other hand, since the cover body 1 is formed by a stamping process, it is necessary to avoid excessive height difference between the first extension portion 122 and the second extension portion 132, which would make the stamping operation too difficult.

[0064] The sum of the distance H1 between the surface of the first extension part 122 away from the electrode group 100 and the surface of the mounting plate 11 away from the electrode group 100 along the second direction and the distance H2 between the surface of the second extension part 132 away from the electrode group 100 and the surface of the mounting plate 11 away from the electrode group 100 along the second direction can be any value between 22mm and 50mm or any range between two values, such as 22mm, 26mm, 30mm, 34mm, 38mm, 42mm, 46mm, 50mm, etc.

[0065] Optionally, such as Figure 3 As shown, the length of the first extension 122 along the first direction is W1, and the length of the second extension 132 along the first direction is W2, and both satisfy 10mm≤W1-W2≤80mm.

[0066] By limiting the difference between the length W1 of the first extension portion 122 along the first direction and the length W2 of the second extension portion 132 along the first direction, while ensuring that the length W2 of the second extension portion 132 along the first direction remains constant, on the one hand, the length W1 of the first extension portion 122 along the first direction is avoided from being too small, which would compress the space below the first extension portion 122, resulting in insufficient space for adding the electrode assembly 100 and limited increase in battery capacity. On the other hand, since the cover body 1 needs to be kept in a horizontal state when assembling the cover body 1, by avoiding the length W1 of the first extension portion 122 along the first direction being too large, the center of gravity of the cover body 1 would be too close to the first extension portion 122, thereby increasing the difficulty of assembling the cover body 1.

[0067] The difference between the length dimension W1 of the first extension portion 122 along the first direction and the length dimension W2 of the second extension portion 132 along the first direction can be any value between 10mm and 80mm or any range between two values, such as 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, etc.

[0068] In this embodiment, to verify the impact of the above parameter limitations 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.

[0069] Table 2

[0070]

[0071] A comparison of Examples 7 to 12 with Comparative Examples 5 to 6 shows that when the product of the thickness T1 of the limiting rib 14 along the third direction and the width B of the limiting rib 14 along the direction perpendicular to the second inner insulation portion 242 is less than 0.7 mm... 2≤T1×B≤3.24mm 2 When the value is at its minimum, the cross-sectional area of ​​the limiting rib 14 is too small, resulting in weak structural strength. This makes it prone to deformation and unable to effectively fix the inner insulating part 24, causing it to easily shift and expose the cover plate body 1, posing a risk of short circuit. When the product of the thickness T1 of the limiting rib 14 along the third direction and the width B of the limiting rib 14 along the direction perpendicular to the second inner insulating part 242 is greater than 0.7mm... 2 ≤T1×B≤3.24mm 2 When the maximum value is reached, the cross-sectional area of ​​the limiting stiffener 14 is too large, resulting in too little space between the two limiting stiffeners 14 for accommodating the second inner insulation part 242, which leads to assembly difficulties.

[0072] A comparison of Examples 7 to 12 with Comparative Examples 7 to 8 reveals that when the sum of the distance H1 between the surface of the first extension portion 122 away from the electrode assembly 100 and the surface of the mounting plate 11 away from the electrode assembly 100 along the second direction and the distance H2 between the surface of the second extension portion 132 away from the electrode assembly 100 and the surface of the mounting plate 11 away from the electrode assembly 100 along the second direction is less than the minimum value of 22mm ≤ H1 + H2 ≤ 50mm, the height difference between the first extension portion 122 and the second extension portion 132 is too small, resulting in the distance between the first extension portion 122 and the second extension portion 132 along the second direction being too close. This not only leads to the compression of the dimensions of the first connecting portion 121 and the second connecting portion 131, but also causes the first extension of the riveting block 21 to be affected. If the dimensions of section 212 and the second extension section 213 are too small, the area of ​​the rivet block 21 used for welding will be reduced, the current carrying capacity will be reduced, and the space below the first extension section 122 will be compressed, resulting in insufficient space for adding the electrode group 100 and limited increase in battery capacity. When the sum of the distance H1 between the surface of the first extension section 122 away from the electrode group 100 and the surface of the mounting plate 11 away from the electrode group 100 along the second direction and the distance H2 between the surface of the second extension section 132 away from the electrode group 100 and the surface of the mounting plate 11 away from the electrode group 100 along the second direction is greater than the maximum value of 22mm≤H1+H2≤50mm, the height difference between the first extension section 122 and the second extension section 132 is too large, which makes the stamping operation too difficult.

[0073] A comparison of Examples 7 to 12 with Comparative Examples 9 to 10 reveals that when the difference between the length W1 of the first extension portion 122 along the first direction and the length W2 of the second extension portion 132 along the first direction is less than the minimum value of 10mm ≤ W1 - W2 ≤ 80mm, the length W1 of the first extension portion 122 along the first direction is too small, resulting in compression of the space below the first extension portion 122, which leads to insufficient space for adding the electrode assembly 100 and limited improvement in battery capacity. When the difference between the length W1 of the first extension portion 122 along the first direction and the length W2 of the second extension portion 132 along the first direction is greater than the maximum value of 10mm ≤ W1 - W2 ≤ 80mm, the length W1 of the first extension portion 122 along the first direction is too large, causing the center of gravity of the cover body 1 to be too close to the first extension portion 122, thereby increasing the difficulty of assembling the cover body 1.

[0074] Optionally, such as Figure 1 As shown, the inner side of the cover plate body 1 facing the electrode group 100 is provided with an insertion protrusion 15 that has the same outline as the cover plate body 1. By providing an insertion protrusion 15 that has the same outline as the cover plate body 1 on the inner side of the cover plate body 1 facing the electrode group 100, the cover plate body 1 can be assembled by inserting it into the battery housing 200, thereby facilitating subsequent welding operations.

[0075] In this embodiment, the outline of the cover plate body 1 is the shape of the cover plate body 1 after it is formed by stamping and stretching to form the mounting plate 11, the first extension plate 12 and the second extension plate 13.

[0076] In this embodiment, as Figure 5 , Figure 6 As shown, a battery is also provided, comprising an electrode assembly 100, a battery casing 200, and a battery cover plate according to this embodiment. The battery casing 200 is a hollow casing structure with at least one opening. The battery cover plate is disposed at the opening of the battery casing 200, closing the battery casing 200 to form a receiving cavity for accommodating the electrode assembly 100. By using the aforementioned battery cover plate, this battery not only reduces the external space occupied but also expands the internal space, increasing the volume of the electrode assembly 100 and thereby enhancing the power supply capacity.

[0077] In order to adapt to the battery cover provided in this embodiment, the shape of the battery housing 200 is adapted to the shape of the battery cover, and the electrode assembly 100 is provided with a protrusion 101 located below the first extension 122.

[0078] In this embodiment, in order to ensure the safety of the battery, an explosion-proof valve is also provided on the battery. The explosion-proof valve can be provided on the battery housing 200, or on the first extension portion 122 or the second extension portion 132 of the battery cover provided in this embodiment.

[0079] In this embodiment, the battery is a blade battery. Since the blade battery has a structure with tabs on both sides of the electrode group 100, it is provided with two battery covers. Therefore, based on the battery covers provided in this embodiment, two types of blade batteries can be derived. One type has two battery covers of the same type as the battery cover provided in this embodiment, and the other type has one battery cover of the same type as the battery cover provided in this embodiment, while the other retains the traditional battery cover type.

[0080] 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 plate, a first expansion plate, and a second expansion plate. The first expansion plate includes a first connecting portion and a first expansion portion. The first connecting portion is inclined. One end of the first connecting portion is connected to the mounting plate, and the other end of the first connecting portion is connected to a first expansion portion that is higher than the mounting plate. The second expansion plate includes a second connecting portion and a second expansion portion. The second connecting portion is inclined. One end of the second connecting portion is connected to the mounting plate, and the other end of the second connecting portion is connected to a second expansion portion that is lower than the mounting plate. The pole module is insulated from the mounting plate, and the portion of the pole module extending beyond the outside of the mounting plate is lower than the first extension portion. The pole module includes a riveting block, which is insulatedly connected to the side of the cover plate body away from the pole assembly. The riveting block includes a riveting part, a first extension part, and a second extension part. The riveting part abuts against the mounting plate. The first extension part is located on the side of the riveting part near the first expansion plate and abuts against the first connecting part. The second extension part is located on the side of the riveting part near the second expansion plate and abuts against the second connecting part. The length of the riveted part along the first direction is L1, the length of the first extension part along the direction parallel to the first connecting part is L2, and the length of the second extension part along the direction parallel to the second connecting part is L3, and satisfies 0.3≤(L2+L3) / L1≤0.

55.

2. The battery cover according to claim 1, characterized in that, The electrode module further includes a conductive electrode post, which includes a column portion and a plate portion. The plate portion is located on the side of the mounting plate facing the electrode assembly. One end of the column portion is connected to the plate portion, and the other end of the column portion passes through the mounting plate and is riveted to the riveting portion. The cross-section of the column portion is elliptical, and the major axis dimension of the column portion along the first direction is E, which satisfies 0.35≤E / L1≤0.

55.

3. The battery cover according to claim 1, characterized in that, The pole module also includes an external insulating component, which includes a first external insulating portion and a second external insulating portion. The second external insulating portion is disposed on both sides of the first external insulating portion along a first direction. The first external insulating portion is disposed between the riveting portion and the mounting plate. The second external insulating portion is also disposed between the first extension portion and the first connecting portion, and between the second extension portion and the second connecting portion.

4. The battery cover according to claim 1, characterized in that, The cover plate body also includes limiting ribs. The first connecting part and the second connecting part are each provided with two limiting ribs spaced apart along a third direction on the side facing the pole group. The pole module also includes an inner insulating component. The inner insulating component includes a first inner insulating part, a second inner insulating part and a third inner insulating part. The second inner insulating part is provided on both sides of the first inner insulating part along a first direction. The third inner insulating part is provided on the side of the second inner insulating part away from the first inner insulating part. The first inner insulating part abuts against the side of the mounting plate facing the pole group. The first connecting part and the second connecting part are each provided with abutting second inner insulating part on the side facing the pole group. The second inner insulating part is located between the corresponding two limiting ribs. The first extension part and the second extension part are each provided with abutting third inner insulating part on the side facing the pole group.

5. The battery cover according to claim 4, characterized in that, The thickness of the limiting rib along the third direction is T1, and the width of the limiting rib along the direction perpendicular to the second inner insulation part is B, which satisfies 0.7mm. 2 ≤T1×B≤3.24mm 2 .

6. The battery cover according to claim 1, characterized in that, The distance between the surface of the first extension part away from the electrode group and the surface of the mounting plate away from the electrode group along the second direction is H1, and the distance between the surface of the second extension part away from the electrode group and the surface of the mounting plate away from the electrode group along the second direction is H2, and both satisfy 22mm≤H1+H2≤50mm.

7. The battery cover according to claim 1, characterized in that, The length of the first extension part along the first direction is W1, and the length of the second extension part along the first direction is W2, and both satisfy 10mm≤W1-W2≤80mm.

8. A battery, characterized in that, The battery includes an electrode assembly, a battery housing, and a battery cover as described in any one of claims 1-7. The battery housing is a hollow housing structure with at least one opening. The battery cover is disposed at the opening of the battery housing to close the battery housing and form a receiving cavity for accommodating the electrode assembly.

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