Battery cover and battery

Abstract

This invention belongs to the field of battery technology and discloses a battery cover and a battery. The battery cover includes a cover body and a terminal module. The cover body includes a mounting plate and protective bosses. Protective bosses are provided on both sides of the mounting plate. The mounting plate has a raised portion, and both the raised portion and the protective bosses are hollow raised structures. The raised portion has a first expansion cavity, and the protective bosses have a second expansion cavity. The terminal module is insulatedly connected to the mounting plate. One side of the module is located inside the cover body facing the terminal assembly and is connected to the electrode tab on the terminal assembly. The other side passes through the mounting plate and is located outside the cover body away from the terminal assembly. The height of the protective boss is greater than the height of the portion of the terminal module located outside the cover body. This invention reduces the space occupied on the outside of the battery cover, increases the battery module assembly rate, and provides protection for the terminal module. Furthermore, the hollow raised structure of the raised portion and the protective boss increases the volume of the terminal assembly to improve battery 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 plate and a protective boss. The mounting plate has the protective boss on both sides along a first direction. The mounting plate includes a flat plate and a protruding part. The protruding part and the protective boss are both hollow protruding structures formed by the cover plate body protruding from the inside towards the pole group to the outside away from the pole group. The protruding part has a first expansion cavity, and the protective boss has a second expansion cavity.

[0009] The pole module is insulatedly connected to the mounting plate. One side of the pole module is located on the inner side of the cover plate body facing the pole group and is connected to the pole lug on the pole group. The other side of the pole module passes through the mounting plate body and is located on the outer side of the cover plate body away from the pole group. The height of the protective boss is greater than the height of the portion of the pole module located on the outer side of the cover plate body.

[0010] Optionally, the electrode module includes a connecting top plate, a flow guiding bottom plate, and two conductive electrode posts. The two conductive electrode posts are insulatedly connected to the mounting plate and located on both sides of the protrusion along the first direction. The connecting top plate is located on the side of the cover plate body away from the electrode group and is used to connect the two conductive electrode posts located on the outer side of the cover plate body. The flow guiding bottom plate is located on the side of the cover plate body facing the electrode group and is used to connect the two conductive electrode posts located on the inner side of the cover plate body. The surface of the connecting top plate away from the electrode group is lower than the surface of the protective protrusion away from the electrode group.

[0011] Optionally, the connecting top plate includes a first connecting plate, a second connecting plate, and a third connecting plate. The third connecting plate is provided on both sides of the first connecting plate along the first direction. The second connecting plate is inclinedly disposed between the first connecting plate and the third connecting plate. The second connecting plate includes a low end and a high end. The low end is connected to the third connecting plate, and the high end is connected to the first connecting plate to form a receiving groove. The protrusion is received in the receiving groove, and the conductive electrode post is connected to the third connecting plate.

[0012] The included angle between the second connecting plates located on both sides of the first connecting plate and facing the pole group is N1, and satisfies 15°≤N1≤90°.

[0013] Optionally, the length of the connecting top plate along the first direction is W1, and the distance between the two third connecting plates along the first direction is W2, satisfying 0.33≤W2 / W1≤0.5.

[0014] Optionally, the length of the battery cover along the first direction is A, and satisfies 0.38≤W1 / A≤0.6.

[0015] Optionally, the width dimension of the third connecting plate along the second direction is L1, and the width dimension of the conductive electrode post along the second direction is L2, and the condition 3.6mm≤L1-L2≤14mm is satisfied.

[0016] Optionally, the height dimension H along a third direction of the surface of the protective protrusion away from the pole group and the surface of the first connecting plate away from the protrusion is 5.5mm≤H≤20mm.

[0017] Optionally, the protective boss includes a protective top plate and a plurality of enclosure side plates surrounding the protective top plate. One of the plurality of enclosure side plates connected to the mounting plate is inclined. The included angle between the two protective bosses and the enclosure side plates connected to the mounting plate is N2, and satisfies 20°≤N2≤50°.

[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] Optionally, the electrode assembly includes an electrode assembly body and electrode tabs. The electrode assembly body includes a first expansion boss, a second expansion boss, and a mounting surface. The mounting surface is provided on both sides of the first expansion boss. The second expansion boss is provided on the side of the mounting surface opposite to the first expansion boss. The first expansion boss is located in the first expansion cavity, and the second expansion boss is located in the second expansion cavity of the protective boss. The electrode tabs correspond one-to-one with the mounting surfaces and are connected to the corresponding mounting surfaces.

[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 plate and a protective boss, and the portion of the terminal module connected to the mounting plate located on the outside of the cover plate body is lower than the protective boss. This effectively utilizes the space previously occupied by the terminal module protruding from the cover plate body, reducing the space occupied on the outside of the battery cover plate and increasing the battery module assembly rate. Furthermore, the protruding protective boss provides protection for the terminal module, preventing damage from impacts. On the other hand, by providing a protrusion on the mounting plate body and making both the protrusion and the protective boss hollow, the terminal assembly utilizes the first expansion cavity within the protrusion and the second expansion cavity within the protective boss, improving the space utilization between the terminal assembly and the cover plate body, increasing the terminal assembly volume, and improving battery capacity.

[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 1This is an assembly drawing of the battery cover provided by the present invention;

[0024] Figure 2 This is a top-view structural exploded view of the battery cover provided by the present invention;

[0025] Figure 3 This is a structural exploded view of the battery cover provided by the present invention from the bottom perspective;

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

[0027] Figure 5 This is a top view of the battery cover provided by the present invention;

[0028] Figure 6 This is a schematic diagram of the structure 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 partial structural diagram 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 expansion boss; 1012. Second expansion boss; 1013. Mounting surface; 102. Electrode tab; 200. Battery casing;

[0033] 1. Cover plate body; 11. Mounting plate body; 111. Flat plate; 112. Protrusion; 1121. First wall surface; 1122. Second wall surface; 113. First expansion cavity; 12. Protective boss; 121. Protective top plate; 122. Enclosure side plate; 13. Second expansion cavity;

[0034] 2. Electrode post module; 21. Connecting top plate; 211. First connecting plate; 212. Second connecting plate; 213. Third connecting plate; 22. Flow guide bottom plate; 221. First flow guide plate; 222. Second flow guide plate; 223. Third flow guide plate; 23. Conducting electrode post; 24. Outer insulating component; 241. First outer insulating part; 242. Second outer insulating part; 243. Third outer insulating part; 25. Inner insulating component; 251. First inner insulating part; 252. Second inner insulating part; 253. Third inner insulating part; 254. Fourth inner insulating part; 255. Fifth inner insulating part; 26. Sealing ring. 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 length direction of the battery cover is defined as the first direction, the width direction of the battery cover is defined as the second direction, and the thickness direction of the battery cover is defined as the third 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 plate 11 and a protective boss 12. The mounting plate 11 has protective bosses 12 on both sides along the first direction. The mounting plate 11 includes a flat portion 111 and a protrusion 112. Both the protrusion 112 and the protective boss 12 are hollow protrusion structures formed by the cover body 1 protruding from the inner side facing the terminal group 100 to the outer side away from the terminal group 100. The protrusion 112 has a first An expansion cavity 113 is provided, and a second expansion cavity 13 is provided inside the protective boss 12. The pole module 2 is insulatedly connected to the mounting plate 11. One side of the pole module 2 is located inside the cover plate body 1 facing the pole group 100 and is connected to the pole tab 102 on the pole group 100. The other side of the pole module 2 passes through the mounting plate 11 and is located outside the cover plate body 1 away from the pole group 100. The height of the protective boss 12 is greater than the height of the part of the pole module 2 located outside the cover plate body 1.

[0042] The battery cover is designed with a cover body 1 consisting of a mounting plate 11 and a protective boss 12. The portion of the terminal module 2 connected to the mounting plate 11 located outside the cover body 1 is lower than the protective boss 12. This design effectively utilizes the space previously occupied by the terminal module 2 protruding from the cover body 1, reducing the space occupied on the outside of the battery cover and increasing the battery module assembly rate. The protective boss 12 also provides protection for the terminal module 2, preventing damage from impacts. Furthermore, by providing a protrusion 112 on the mounting plate 11 and making both the protrusion 112 and the protective boss 12 hollow protrusions, the electrode assembly 100 can utilize the first expansion cavity 113 within the protrusion 112 and the second expansion cavity 13 within the protective boss 12, thereby increasing the space utilization between the electrode assembly 100 and the cover body 1, increasing the volume of the electrode assembly 100, and improving the battery capacity.

[0043] Since both the protrusion 112 and the protective boss 12 are hollow protrusion structures formed by stretching and stamping, the height that the protective boss 12 and the protrusion 112 can form is limited for a fixed material thickness. The higher the height, the smaller the wall thickness of the protective boss 12 and the protrusion 112, and the greater the difficulty of forming. Therefore, if the height of the protective boss 12 and the protrusion 112 is too large, the height of the protective boss 12 and the protrusion 112 will be too high, which will increase the difficulty of forming and reduce the structural strength of the protective boss 12 and the protrusion 112. Therefore, the height of the protrusion 112 and the protective boss 12 can be freely adjusted on the basis of ensuring easy forming and structural strength. The height of the protective boss 12 and the protrusion 112 can be the same or different. In this embodiment, since a part of the pole module 2 is located on the side of the protrusion 112 away from the pole group 100, in order to avoid the pole module 2 being too close to the top of the protective boss 12, the height of the protective boss 12 is higher than the height of the protrusion 112.

[0044] Optionally, such as Figure 2 , Figure 3 As shown, the electrode module 2 includes a connecting top plate 21, a flow guiding bottom plate 22, and two conductive electrode posts 23. The two conductive electrode posts 23 are insulatedly connected to the mounting plate 11 and are located on both sides of the protrusion 112 along the first direction. The connecting top plate 21 is located on the side of the cover plate body 1 away from the electrode group 100 and is used to connect the two conductive electrode posts 23 at the outer end of the cover plate body 1. The flow guiding bottom plate 22 is located on the side of the cover plate body 1 facing the electrode group 100 and is used to connect the two conductive electrode posts 23 at the inner end of the cover plate body 1. The surface of the connecting top plate 21 away from the electrode group 100 is lower than the surface of the protective protrusion 12 away from the electrode group 100.

[0045] By setting two conductive electrode posts 23 in the electrode post module 2, a multi-electrode post structure is formed, which increases the flow area, improves the flow capacity, reduces the temperature of a single conductive electrode post 23, and improves its service life. Furthermore, since the connecting top plate 21 is used for welding with the electrode plate and the flow guiding bottom plate 22 is used for welding with the electrode tab 102, by connecting the two conductive electrode posts 23 on the same flow guiding bottom plate 22 and the same connecting top plate 21, the connection area is further increased, the flow area is increased, and the flow capacity is improved.

[0046] In this embodiment, as Figure 2As shown, in order to achieve an insulated connection between the conductive electrode post 23 and the cover plate body 1, the electrode post module 2 also includes an outer insulating component 24 and an inner insulating component 25. The outer insulating component 24 is located on the outer side of the cover plate body 1 away from the electrode group 100 and between the connecting top plate 21 and the mounting plate 11. The inner insulating component 25 is located on the inner side of the cover plate body 1 facing the electrode group 100 and between the current guiding bottom plate 22 and the mounting plate 11. In order to avoid electrolyte leakage and ensure the sealing of the battery cover, the electrode post module 2 also includes a sealing ring 26, which is sleeved on the conductive electrode post 23.

[0047] Optionally, such as Figure 3 As shown, the connecting top plate 21 includes a first connecting plate 211, a second connecting plate 212, and a third connecting plate 213. The first connecting plate 211 has a third connecting plate 213 on both sides along the first direction. The second connecting plate 212 is inclined between the first connecting plate 211 and the third connecting plate 213. The second connecting plate 212 includes a low end and a high end. The low end is connected to the third connecting plate 213, and the high end is connected to the first connecting plate 211 to form a receiving groove. The protrusion 112 is received in the receiving groove, and the conductive electrode post 23 is connected to the third connecting plate 213.

[0048] By designing a connecting top plate 21 consisting of a first connecting plate 211, a second connecting plate 212, and a third connecting plate 213, and by tilting the second connecting plate 212 so that its lower end is connected to the third connecting plate 213 and its higher end is connected to the first connecting plate 211, a receiving groove for receiving the protrusion 112 is formed, thereby allowing the connecting top plate 21 to fit tightly against each area of ​​the mounting plate 11 of the cover plate body 1.

[0049] In this embodiment, as Figure 3As shown, in order to adapt to the shape of the cover plate body 1 and make the structure more compact, the protrusion 112 has a first wall surface 1121 parallel to the first connecting plate 211 and a second wall surface 1122 parallel to the second connecting plate 212. The second wall surface 1122 is provided on both sides of the first wall surface 1121 along the first direction. The first connecting plate 211 is attached to the first wall surface 1121, and the second connecting plate 212 is attached to the second wall surface 1122. The flow guide plate 22 includes a first flow guide plate 221, a second flow guide plate 222, and a third flow guide plate 223. The first flow guide plate 221 is provided with a third flow guide plate 223 on both sides along the first direction. The first guide plate 223 and the second guide plate 222 are inclinedly disposed between the first guide plate 221 and the third guide plate 223. The second guide plate 222 includes a low end and a high end. The low end is connected to the third guide plate 223, and the high end is connected to the first guide plate 221, thereby forming a protrusion structure inserted into the protrusion 112. The outer insulating member 24 includes a first outer insulating part 241, a second outer insulating part 242, and a third outer insulating part 243. The first outer insulating part 241 has a third outer insulating part 243 on both sides along the first direction, and the second outer insulating part 242 is inclinedly disposed on the first outer insulating part 241. Between the third outer insulating part 243 and the third outer insulating part 242, the second outer insulating part 242 includes a low end and a high end. The low end is connected to the third outer insulating part 243, and the high end is connected to the first outer insulating part 241. The first outer insulating part 241 is located between the first connecting plate 211 and the first wall surface 1121, the second outer insulating part 242 is located between the second connecting plate 212 and the second wall surface 1122, and the third outer insulating part 243 is located between the flat plate part 111 and the third connecting plate 213. The inner insulating member 25 includes a first inner insulating part 251, a second inner insulating part 252, and a third inner insulating part 253. The edge portion 251 is provided with a third inner insulation portion 253 on both sides along the first direction. The second inner insulation portion 252 is inclinedly disposed between the first inner insulation portion 251 and the third inner insulation portion 253. The second inner insulation portion 252 includes a low end and a high end. The low end is connected to the third inner insulation portion 253, and the high end is connected to the first inner insulation portion 251. The first inner insulation portion 251 is disposed between the first guide plate body 221 and the first wall surface 1121. The second inner insulation portion 252 is disposed between the second guide plate body 222 and the second wall surface 1122. The third inner insulation portion 253 is disposed between the third guide plate body 223 and the flat plate portion 111.

[0050] Optionally, such as Figure 4 As shown, the included angle between the second connecting plates 212 located on both sides of the first connecting plate 211 toward the pole group 100 is N1, and satisfies 15°≤N1≤90°.

[0051] By limiting the included angle N1 between the second connecting plates 212 located on both sides of the first connecting plate 211 towards the electrode assembly 100, such that it satisfies 15°≤N1≤90°, the following measures are taken: Firstly, the included angle N1 is not too small, which would cause the second connecting plate 212 and the third connecting plate 213 to become perpendicular, thus failing to effectively alleviate the stress concentration problem. This would lead to cracks easily appearing at the junction of the second connecting plate 212 and the third connecting plate 213, reducing the service life of the connecting top plate 21. Secondly, the included angle N1 is not too large, which would cause the height of the first connecting plate 211 to be too low, thereby compressing the space of the first expansion cavity 113 in the protrusion 112, resulting in limited expansion of the electrode assembly 100 and failing to meet the power supply requirements of the battery.

[0052] The included angle N1 between the second connecting plates 212 located on both sides of the first connecting plate 211 and facing the pole group 100 can be any value between 15° and 90° or a range between any two values, such as 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, etc.

[0053] Optionally, such as Figure 4 As shown, the length of the connecting top plate 21 along the first direction is W1, and the distance between the two third connecting plates 213 along the first direction is W2, satisfying 0.33≤W2 / W1≤0.5.

[0054] By limiting the ratio between the spacing W2 between the two third connecting plates 213 along the first direction and the length W1 of the connecting top plate 21 along the first direction, on the one hand, it avoids that the spacing between the two third connecting plates 213 is too small, which would compress the space of the first expansion cavity 113 in the protrusion 112 between the two third connecting plates 213, resulting in limited expansion of the electrode group 100 and failing to meet the power supply requirements of the battery. On the other hand, it avoids that the spacing between the two third connecting plates 213 is too large, which would reduce the size of the third connecting plates 213, reduce the current flow area, and thus fail to meet the current flow requirements of the battery.

[0055] The ratio between the spacing W2 between the two third connecting plates 213 along the first direction and the length W1 of the connecting top plate 21 along the first direction can be any value between 0.33 and 0.5 or any range between two values, such as 0.33, 0.364, 0.398, 0.432, 0.466, 0.5, etc.

[0056] Optionally, such as Figure 4 As shown, the length of the battery cover along the first direction is A, and it satisfies 0.38≤W1 / A≤0.6.

[0057] By limiting the ratio between the length W1 of the connecting top plate 21 along the first direction and the length A of the battery cover along the first direction, such that 0.38≤W1 / A≤0.6, the following measures are taken: Firstly, the length of the connecting top plate 21 is not too small, resulting in a small welding area between the connecting top plate 21 and the battery plate, reducing the current carrying capacity and failing to meet the current carrying requirements of the battery. Secondly, the length of the connecting top plate 21 along the first direction is not too large, resulting in a compression of the size of the protective boss 12, thereby reducing the size of the second expansion cavity 13 of the protective boss 12 used for the expansion of the electrode group 100, thus limiting the expansion of the electrode group 100 and failing to meet the energy supply requirements of the battery.

[0058] The ratio between the length dimension W1 of the connecting top plate 21 along the first direction and the length dimension A of the battery cover along the first direction can be any value between 0.38 and 0.6 or any range between two values, such as 0.38, 0.424, 0.468, 0.512, 0.556, 0.6, etc.

[0059] 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 six sets of comparative examples are provided for verification.

[0060] Table 1

[0061]

[0062] A comparison of Examples 1 to 6 with Comparative Examples 1 to 2 reveals that when the included angle N1 between the second connecting plates 212 on both sides of the first connecting plate 211 and the side facing the electrode group 100 is less than the minimum value of 15°≤N1≤90°, the included angle N1 is too small, and the second connecting plate 212 and the third connecting plate 213 tend to be perpendicular, thus failing to effectively alleviate the stress concentration problem. Consequently, cracks are prone to appear at the junction of the second connecting plate 212 and the third connecting plate 213, reducing the service life of the connecting top plate 21. When the included angle N1 between the second connecting plates 212 on both sides of the first connecting plate 211 and the side facing the electrode group 100 is greater than the maximum value of 15°≤N1≤90°, the included angle N1 is too large, resulting in the first connecting plate 211 being too low in height. This compresses the space of the first expansion cavity 113 within the protrusion 112, limiting the expansion of the electrode group 100 and failing to meet the energy supply requirements of the battery.

[0063] A comparison of Examples 1 to 6 with Comparative Examples 3 to 4 reveals that when the ratio of the distance W2 between the two third connecting plates 213 along the first direction to the length W1 of the connecting top plate 21 along the first direction is less than the minimum value in the range 0.33 ≤ W2 / W1 ≤ 0.5, the distance between the two third connecting plates 213 is too small, causing compression of the space of the first expansion cavity 113 in the protrusion 112 between the two third connecting plates 213, resulting in limited expansion of the electrode group 100 and failing to meet the power supply requirements of the battery. When the ratio of the distance W2 between the two third connecting plates 213 along the first direction to the length W1 of the connecting top plate 21 along the first direction is greater than the maximum value in the range 0.33 ≤ W2 / W1 ≤ 0.5, the distance between the two third connecting plates 213 is too large, causing a reduction in the size of the third connecting plates 213, resulting in a reduction in the overcurrent area and failing to meet the overcurrent requirements of the battery.

[0064] A comparison of Examples 1 to 6 with Comparative Examples 5 to 6 reveals that when the ratio between the length W1 of the connecting top plate 21 along the first direction and the length A of the battery cover along the first direction is less than the minimum value in the range 0.38≤W1 / A≤0.6, the length of the connecting top plate 21 is too small, resulting in a small welding area between the connecting top plate 21 and the battery plate, reducing the current carrying capacity and failing to meet the current carrying requirements of the battery. When the ratio between the length W1 of the connecting top plate 21 along the first direction and the length A of the battery cover along the first direction is greater than the maximum value in the range 0.38≤W1 / A≤0.6, the length of the connecting top plate 21 along the first direction is too large, resulting in compression of the size of the protective boss 12, thereby reducing the size of the second expansion cavity 13 of the protective boss 12 used for the expansion of the electrode group 100, making the expansion of the electrode group 100 limited and failing to meet the energy supply requirements of the battery.

[0065] Optionally, such as Figure 5 As shown, the width dimension of the third connecting plate 213 along the second direction is L1, and the width dimension of the conductive electrode post 23 along the second direction is L2, and both satisfy 3.6mm≤L1-L2≤14mm.

[0066] By limiting the difference between the width dimension L1 of the third connecting plate 213 along the second direction and the width dimension L2 of the conductive electrode post 23 along the second direction, such that it satisfies 3.6mm≤L1-L2≤14mm, this avoids two problems. On the one hand, it prevents the difference from being too small, which would result in too small a distance between the conductive electrode post 23 and the edge of the third connecting plate 213 along the second direction, leading to low structural strength, easy cracking, and reduced service life of the connecting top plate 21. On the other hand, it prevents the difference from being too large, which would compress the size of the conductive electrode post 23, reduce the current-carrying area, and fail to meet the current-carrying requirements of the battery.

[0067] The difference between the width dimension L1 of the third connecting plate 213 along the second direction and the width dimension L2 of the conductive electrode post 23 along the second direction can be any value between 3.6mm and 14mm or any range between two values, such as 3.6mm, 5.68mm, 7.76mm, 9.84mm, 11.92mm, 14mm, etc.

[0068] Optionally, such as Figure 4 As shown, the height dimension of the protective boss 12 away from the surface of the electrode group 100 and the surface of the first connecting plate 211 away from the surface of the protrusion 112 along the third direction is H, and it satisfies 5.5mm≤H≤20mm.

[0069] By limiting the height dimension H of the surface of the protective boss 12 away from the electrode assembly 100 and the surface of the first connecting plate 211 away from the protrusion 112 along a third direction, such that it satisfies 5.5mm≤H≤20mm, the following measures are taken: Firstly, the height dimension H is not too small, which would cause the first connecting plate 211 to be too close to the top of the protective boss 12 and easily cause collisions and damage. Secondly, the distance between the first connecting plate 211 and the top of the protective boss 12 is not too far, which would compress the space of the first expansion cavity 113 in the protrusion 112, thus limiting the expansion of the electrode assembly 100 and failing to meet the power supply requirements of the battery.

[0070] The height H of the protective boss 12 away from the surface of the electrode group 100 and the surface of the first connecting plate 211 away from the surface of the protrusion 112 along a third direction can be any value between 5.5mm and 20mm or any range between two values, such as 5.5mm, 8.4mm, 11.3mm, 14.2mm, 17.1mm, 20mm, etc.

[0071] Optionally, such as Figure 4 As shown, the protective boss 12 includes a protective top plate 121 and a plurality of enclosure side plates 122 surrounding the protective top plate 121. One of the plurality of enclosure side plates 122 connected to the mounting plate 11 is inclined. The included angle between the two protective bosses 12 and the enclosure side plates 122 connected to the mounting plate 11 is N2, and satisfies 20°≤N2≤50°.

[0072] By limiting the included angle N2 between the two protective protrusions 12 and the enclosure side plate 122 connected to the mounting plate 11, on the one hand, it avoids the included angle N2 being too small, which would cause the mounting plate 11 and the enclosure side plate 122 connected to the mounting plate 11 to be nearly perpendicular, thus failing to effectively alleviate the stress concentration problem, and consequently causing cracks to easily appear at the junction of the protective protrusions 12 and the mounting plate 11, reducing the service life of the cover plate body 1. On the other hand, it avoids the included angle N2 being too large, which would reduce the height of the protective protrusions 12, thereby compressing the space of the second expansion cavity 13 of the protective protrusions 12 used for the expansion of the electrode group 100, resulting in limited expansion of the electrode group 100 and failing to meet the power supply requirements of the battery.

[0073] The included angle N2 between the two protective protrusions 12 and the enclosure side plate 122 connected to the mounting plate 11 can be any value between 20° and 50° or any range between two values, such as 20°, 25°, 30°, 35°, 40°, 45°, 50°, etc.

[0074] In this embodiment, in order to expand the inner insulation area of ​​the cover plate body 1 and improve the insulation, the inner insulation member 25 also includes a fourth inner insulation part 254 and a fifth inner insulation part 255. The fourth inner insulation part 254 is parallel to the enclosure side plate 122 connected to the mounting plate body 11 and is disposed on the surface of the enclosure side plate 122 facing the second expansion cavity 13. The fifth inner insulation part 255 is disposed on the surface of the protective top plate 121 facing the second expansion cavity 13.

[0075] 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 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 reveals that when the difference between the width L1 of the third connecting plate 213 along the second direction and the width L2 of the conductive electrode post 23 along the second direction is less than the minimum value of 3.6mm ≤ L1 - L2 ≤ 14mm, the spacing between the conductive electrode post 23 and the edge of the third connecting plate 213 along the second direction is too small, resulting in low structural strength, easy cracking, and reduced service life of the connecting top plate 21. When the difference between the width L1 of the third connecting plate 213 along the second direction and the width L2 of the conductive electrode post 23 along the second direction is greater than the maximum value of 3.6mm ≤ L1 - L2 ≤ 14mm, the size of the conductive electrode post 23 is compressed, reducing the overcurrent area and failing to meet the overcurrent requirements of the battery.

[0079] A comparison of Examples 7 to 12 with Comparative Examples 9 to 10 reveals that when the height dimension H of the protective protrusion 12 away from the electrode group 100 and the first connecting plate 211 away from the protrusion 112 along a third direction is less than the minimum value of 5.5mm≤H≤20mm, the height dimension H is too small, causing the first connecting plate 211 to be too close to the top of the protective protrusion 12 and prone to collision, resulting in damage. When the height dimension H of the protective protrusion 12 away from the electrode group 100 and the first connecting plate 211 away from the protrusion 112 along a third direction is greater than the maximum value of 5.5mm≤H≤20mm, the first connecting plate 211 is too far from the top of the protective protrusion 12, thereby compressing the space of the first expansion cavity 113 in the protrusion 112, resulting in limited expansion of the electrode group 100 and failing to meet the power supply requirements of the battery.

[0080] A comparison of Examples 7 to 12 with Comparative Examples 11 to 12 reveals that when the included angle N2 between the two protective protrusions 12 and the enclosure side plate 122 connected to the mounting plate 11 is less than the minimum value of the range 20°≤N2≤50°, the included angle N2 is too small, causing the mounting plate 11 and the enclosure side plate 122 connected to the mounting plate 11 to be nearly perpendicular, thus failing to effectively alleviate the stress concentration problem. Consequently, cracks are prone to appear at the junction of the protective protrusions 12 and the mounting plate 11, reducing the service life of the cover plate body 1. When the included angle N2 between the two protective protrusions 12 and the enclosure side plate 122 connected to the mounting plate 11 is greater than the maximum value of the range 20°≤N2≤50°, the included angle N2 is too large, thereby reducing the height of the protective protrusions 12. This further compresses the space of the second expansion cavity 13 used for the expansion of the electrode group 100, resulting in limited expansion of the electrode group 100 and failing to meet the power supply requirements of the battery.

[0081] In this embodiment, as Figure 7 , Figure 8 As shown, a battery is also provided, comprising an electrode assembly 100, a battery casing 200, and the aforementioned battery cover. The battery casing 200 is a hollow casing structure with at least one opening. The battery cover is disposed at the opening of the battery casing 200, closing the battery casing 200 to form a cavity for accommodating the electrode assembly 100. By using the aforementioned battery cover, 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 its power supply capacity.

[0082] In this embodiment, the battery can be 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.

[0083] In addition, the battery can also be a prismatic battery. Since the terminal module 2 of the battery cover is provided with two conductive electrode posts 23, when the battery is a prismatic battery, one of the two conductive electrode posts 23 provided on the terminal module 2 is connected to the positive electrode tab of the electrode group 100, and the other conductive electrode post 23 is connected to the negative electrode tab of the electrode group 100.

[0084] Optionally, 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 expansion boss 1011, a second expansion boss 1012, and a mounting surface 1013. Mounting surfaces 1013 are provided on both sides of the first expansion boss 1011. The second expansion boss 1012 is provided on the side of the mounting surface 1013 facing away from the first expansion boss 1011. The first expansion boss 1011 is located in the first expansion cavity 113, and the second expansion boss 1012 is located in the second expansion cavity 13 of the protective boss 12. The electrode tabs 102 correspond one-to-one with the mounting surfaces 1013 and are connected to the corresponding mounting surfaces 1013.

[0085] By connecting tabs 102 to the mounting surfaces 1013 on both sides of the first expansion boss 1011, the area of ​​the tabs 102 is increased, thereby improving the current carrying capacity. Furthermore, by setting the first expansion boss 1011 and the second expansion boss 1012, the volume of the electrode assembly 100 is increased, thereby increasing the capacity. In addition, since the second expansion boss 1012 corresponds to the protective boss 12, when the electrode assembly 100 is inserted into the housing, the thrust is applied to the second expansion boss 1012, thereby preventing the tabs 102 from being subjected to force. This achieves protection for the tabs 102 when the electrode assembly 100 is inserted into the housing, preventing the tabs 102 from being easily desoldered or damaged due to thrust during insertion.

[0086] 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 and a protective boss. The mounting plate has the protective boss on both sides along a first direction. The mounting plate includes a flat plate and a protruding part. The protruding part and the protective boss are both hollow protruding structures formed by the cover plate body protruding from the inside towards the pole group to the outside away from the pole group. The protruding part has a first expansion cavity, and the protective boss has a second expansion cavity. The pole module is insulatedly connected to the mounting plate. One side of the pole module is located on the inner side of the cover plate body facing the pole group and is connected to the pole lug on the pole group. The other side of the pole module passes through the mounting plate body and is located on the outer side of the cover plate body away from the pole group. The height of the protective boss is greater than the height of the part of the pole module located on the outer side of the cover plate body. The electrode module includes a connecting top plate, a flow guiding bottom plate, and two conductive electrode posts. The two conductive electrode posts are insulatedly connected to the mounting plate and located on both sides of the protrusion along the first direction. The connecting top plate is located on the side of the cover plate body away from the electrode group and is used to connect the two conductive electrode posts located on the outer side of the cover plate body. The flow guiding bottom plate is located on the side of the cover plate body facing the electrode group and is used to connect the two conductive electrode posts located on the inner side of the cover plate body. The surface of the connecting top plate away from the electrode group is lower than the surface of the protective protrusion away from the electrode group. The connecting top plate includes a first connecting plate, a second connecting plate, and a third connecting plate. The third connecting plate is provided on both sides of the first connecting plate along the first direction, and the third connecting plate on both sides extends along the first direction. The second connecting plate is inclined between the first connecting plate and the third connecting plate. The second connecting plate includes a low end and a high end. The low end is connected to the third connecting plate, and the high end is connected to the first connecting plate to form a receiving groove. The protrusion is received in the receiving groove, and the conductive electrode post is connected to the third connecting plate. The included angle between the second connecting plates located on both sides of the first connecting plate and facing the pole group is N1, and satisfies 15°≤N1≤90°.

2. The battery cover according to claim 1, characterized in that, The length of the connecting top plate along the first direction is W1, and the distance between the two third connecting plates along the first direction is W2, satisfying 0.33≤W2 / W1≤0.

5.

3. The battery cover according to claim 2, characterized in that, The length of the battery cover along the first direction is A, and it satisfies 0.38≤W1 / A≤0.

6.

4. The battery cover according to claim 1, characterized in that, The width of the third connecting plate along the second direction is L1, and the width of the conductive electrode post along the second direction is L2, and both satisfy 3.6mm≤L1-L2≤14mm.

5. The battery cover according to claim 1, characterized in that, The height dimension H along a third direction of the surface of the protective protrusion away from the pole group and the surface of the first connecting plate away from the protrusion is 5.5mm≤H≤20mm.

6. The battery cover according to claim 1, characterized in that, The protective boss includes a protective top plate and multiple enclosure side plates surrounding the protective top plate. One of the multiple enclosure side plates connected to the mounting plate is inclined. The included angle between the two protective bosses and the enclosure side plates connected to the mounting plate is N2, and satisfies 20°≤N2≤50°.

7. 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 1-6. 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.

8. The battery according to claim 7, characterized in that, The electrode assembly includes an electrode assembly body and electrode tabs. The electrode assembly body includes a first expansion boss, a second expansion boss, and a mounting surface. The mounting surface is provided on both sides of the first expansion boss. The second expansion boss is provided on the side of the mounting surface opposite to the first expansion boss. The first expansion boss is located in the first expansion cavity, and the second expansion boss is located in the second expansion cavity of the protective boss. The electrode tabs correspond one-to-one with the mounting surfaces and are connected to the corresponding mounting surfaces.

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