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 first mounting part, a second mounting part, a connecting part, and a protective part. The connecting part is inclined, and the protective part has an expansion cavity. The terminal module includes a connecting top plate, a current-guiding bottom plate, and two conductive electrode posts. The two conductive electrode posts are insulated from the first mounting part and the second mounting part, respectively. The inner and outer sides of the two conductive electrode posts are connected through the connecting top plate and the current-guiding bottom plate. By connecting the two conductive electrode posts into one unit through the connecting top plate and the current-guiding bottom plate, the current-passing area is increased, and the current-passing capacity is improved. Furthermore, the connecting top plate is lower than the protective part, reducing the space occupied on the outer side, improving the battery module assembly rate, and also providing protection for the terminal module to avoid impact damage. The hollow protruding structure of the protective part allows the terminal group to utilize the expansion cavity, improving the space utilization rate between the terminal group and the cover body, increasing the volume of the terminal group, and increasing the 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 first mounting part, a second mounting part, a connecting part, and a protective part. The first mounting part, the second mounting part, and the connecting part are all solid flat plate structures. The connecting part is inclined and includes a low end close to the electrode group and a high end away from the electrode group. The high end is connected to the first mounting part, and the low end is connected to the second mounting part. The protective part is a hollow protrusion structure formed by the indentation of the cover plate body from the inside towards the electrode group to the outside away from the electrode group. The protective part has an expansion cavity inside and is connected to the side of the first mounting part away from the connecting part.

[0009] The electrode module includes a connecting top plate, a flow guiding bottom plate, and two conductive electrode posts. The two conductive electrode posts are insulated from and connected to the first mounting part and the second mounting part, respectively. The connecting top plate is located on the side of the cover plate body away from the electrode assembly 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 assembly 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 assembly is lower than the surface of the protective part away from the electrode assembly.

[0010] Optionally, the distance between the surface of the protective part away from the electrode group and the surface of the second mounting part away from the electrode group along the second direction is H1, and the distance between the surface of the first mounting part away from the electrode group and the surface of the second mounting part away from the electrode group along the second direction is H2, and satisfies 7.5mm≤H1-H2≤20mm.

[0011] Optionally, the distance between the side of the first mounting part away from the connecting part and the side of the second mounting part away from the connecting part along the first direction is W1, and the length of the connecting top plate along the first direction is W2, and satisfies 7mm≤W1-W2≤16mm.

[0012] Optionally, the length dimension of the cover plate body along the first direction is A, and satisfies 0.48≤W1 / A≤0.7.

[0013] Optionally, the conductive electrode post includes a first column portion, a second column portion, and a limiting portion. The flow guiding base plate has a stepped through hole including a first hole segment and a second hole segment, and a limiting step surface is formed between the first hole segment and the second hole segment. The stepped through hole corresponds one-to-one with the conductive electrode post. The first column portion is inserted into the first hole segment, and the limiting portion is inserted into the second hole segment and abuts against the limiting step surface. The first column portion passes through the cover plate body and is connected to the connecting top plate.

[0014] Optionally, the height dimension of the guide plate along the second direction is L1, and the distance dimension between the limiting step surface and the surface of the guide plate facing the pole group is L2, and satisfies 0.8mm≤L1-L2≤1.8mm.

[0015] Optionally, the protective part includes a protective top plate and a plurality of enclosure side plates surrounding the protective top plate, wherein one of the plurality of enclosure side plates connected to the first mounting part is inclined;

[0016] The thickness of the side panel of the enclosure is T1, and the thickness of the protective top panel is T2, and both satisfy 0.5≤T1 / T2≤0.8.

[0017] Optionally, the angle between the connecting portion and the second mounting portion on the side away from the pole group is N, and satisfies 105°≤N≤150°.

[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 mounting surface, a second mounting surface, a connecting surface, and an expansion boss. The connecting surface is inclined between the first mounting surface and the second mounting surface and is parallel to the connecting portion. The first mounting surface is located on the side of the connecting surface near the first mounting portion, and the second mounting surface is located on the side of the connecting surface near the second mounting portion. The expansion boss is located on the side of the first mounting portion away from the connecting surface. A portion of the electrode tab is provided on the first mounting surface, the second mounting surface, and the connecting surface.

[0020] The beneficial effects of this invention are:

[0021] This invention provides a battery cover plate. The cover plate body is designed with a first mounting portion, a second mounting portion, a connecting portion, and a protective portion. This design allows the two conductive electrode posts of the terminal module to be insulated from and connected to the first and second mounting portions, respectively. The two conductive electrode posts are then connected as a single unit by a connecting top plate and a current-guiding bottom plate, thereby increasing the current-carrying area and improving current-carrying capacity. Furthermore, since the surface of the connecting top plate facing away from the terminal assembly is lower than the surface of the protective portion facing away from the terminal assembly, the space previously occupied by the protruding terminal module is effectively utilized through the highest protective portion, reducing the space occupied on the outer side of the battery cover plate and increasing the battery module assembly rate. The highest protective portion also provides protection for the terminal module, preventing damage from impacts. In addition, because the protective portion is a hollow, protruding structure, and the height of the first mounting portion is higher than the second mounting portion, the terminal assembly utilizes the expanded cavity inside the protective portion and the space below the first mounting portion, 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 1 This 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 plate 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 schematic diagram of the structure of the cover body in the battery cover provided by the present invention;

[0028] Figure 6 This is a partial structural diagram of a battery using the battery cover provided by the present invention;

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

[0030] In the picture:

[0031] 100. Electrode assembly; 101. Electrode assembly body; 1011. First mounting surface; 1012. Second mounting surface; 1013. Connecting surface; 1014. Capacity expansion boss; 102. Electrode tab; 200. Battery casing;

[0032] 1. Cover plate body; 11. First mounting part; 12. Second mounting part; 13. Connecting part; 14. Protective part; 141. Protective top plate; 142. Enclosure side plate; 143. Expanded cavity;

[0033] 2. Electrode 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; 224. First Hole Section; 225. Second Hole Section; 226. Limiting Step Surface; 23. Conducting Electrode Post; 231. First Post Section; 232. Second Post Section; 233. Limiting Section; 24. Outer Insulation Component; 241. First Outer Insulation Component; 242. Second Outer Insulation Component; 243. Third Outer Insulation Component; 25. Inner Insulation Component; 251. First Inner Insulation Component; 252. Second Inner Insulation Component; 253. Third Inner Insulation Component; 254. Fourth Inner Insulation Component; 255. Fifth Inner Insulation Component; 26. Sealing Ring. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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, and the thickness direction of the battery cover is defined as the second direction.

[0040] like Figures 1 to 5 As shown, the battery cover includes a cover body 1 and an electrode module 2. The cover body 1 includes a first mounting part 11, a second mounting part 12, a connecting part 13, and a protective part 14. The first mounting part 11, the second mounting part 12, and the connecting part 13 are all solid flat plate structures. The connecting part 13 is inclined and includes a low end close to the electrode group 100 and a high end away from the electrode group 100. The high end is connected to the first mounting part 11, and the low end is connected to the second mounting part 12. The protective part 14 is a hollow protrusion structure formed by the indentation of the cover body 1 from the inner side facing the electrode group 100 to the outer side away from the electrode group 100. The protective part 14 has an expansion cavity 143. 4. Connected to the side of the first mounting part 11 away from the connecting part 13, the pole module 2 includes a connecting top plate 21, a flow guiding bottom plate 22 and two conductive poles 23. The two conductive poles 23 are insulated from the first mounting part 11 and the second mounting part 12 respectively. The connecting top plate 21 is located on the side of the cover plate body 1 away from the pole group 100 and is used to connect the two conductive poles 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 pole group 100 and is used to connect the two conductive poles 23 at the inner end of the cover plate body 1. The surface of the connecting top plate 21 away from the pole group 100 is lower than the surface of the protective part 14 away from the pole group 100.

[0041] The battery cover is designed with a cover body 1 consisting of a first mounting part 11, a second mounting part 12, a connecting part 13, and a protective part 14. This design allows the two conductive electrode posts 23 of the electrode module 2 to be insulated from the first mounting part 11 and the second mounting part 12, respectively. The two conductive electrode posts 23 are connected as a single unit by a connecting top plate 21 and a current-guiding bottom plate 22, thereby increasing the current-carrying area and improving the current-carrying capacity. Furthermore, since the surface of the connecting top plate 21 facing away from the electrode assembly 100 is lower than the surface of the protective part 14 facing away from the electrode assembly 100, the highest protective part 14 effectively prevents the electrode module 2 from protruding from the cover. The space occupied by the plate body 1 is effectively utilized, reducing the space occupied on the outside of the battery cover, improving the battery module assembly rate, and providing protection for the terminal module 2 through the highest protective part 14 to avoid damage caused by bumps. In addition, since the protective part 14 is a hollow protruding structure and the height of the first mounting part 11 is higher than that of the second mounting part 12, the electrode group 100 can improve the space utilization rate between the electrode group 100 and the cover body 1 by utilizing the expansion cavity 143 inside the protective part 14 and the space below the first mounting part 11, thereby increasing the volume of the electrode group 100 and improving the battery capacity.

[0042] In this embodiment, since the connecting portion 13 of the cover plate body 1 is inclined, and the first mounting portion 11 is located at the high end of the connecting portion 13, and the second mounting portion 12 is located at the low end of the connecting portion 13, the first mounting portion 11, the connecting portion 13, and the second mounting portion 12 together form a Z-shaped structure. Therefore, in order to ensure that the connecting top plate 21 and the guide bottom plate 22 located on both sides of the cover plate body 1 are tightly fitted with the cover plate body 1, the connecting top plate 21 includes a first connecting plate body 211, a second connecting plate body 212, and a third connecting plate body 213. The second connecting plate body 212 is parallel to the connecting portion 13 and abuts against the surface of the connecting portion 13 away from the electrode assembly 100. The first connecting plate body 211 is connected to the side of the second connecting plate body 212 near the first mounting portion 11 and abuts against the first mounting portion 11. On the surface of the electrode assembly 100 away from the second mounting portion 12, the third connecting plate 213 is connected to the second connecting plate 212 on the side near the second mounting portion 12 and abuts against the surface of the second mounting portion 12 away from the electrode assembly 100. 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 second flow guide plate 222 is parallel to the connecting portion 13 and abuts against the surface of the connecting portion 13 facing the electrode assembly 100. The first flow guide plate 221 is connected to the second flow guide plate 222 on the side near the first mounting portion 11 and abuts against the surface of the first mounting portion 11 facing the electrode assembly 100. The third flow guide plate 223 is connected to the second flow guide plate 222 on the side near the second mounting portion 12 and abuts against the surface of the second mounting portion 12 facing the electrode assembly 100.

[0043] To achieve an insulated connection between the pole post module 2 and the cover plate body 1, the pole post module 2 further includes an outer insulating component 24 and an inner insulating component 25. The outer insulating component 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 is disposed between the first connecting plate body 211 and the first mounting part 11, the second outer insulating part 242 is disposed between the second connecting plate body 212 and the connecting part 13, and the third outer insulating part 243 is disposed between the third connecting plate body 213 and the second mounting part 12. The inner insulating component 25 includes a first inner insulating part 25. 1. The second inner insulation part 252 and the third inner insulation part 253, the first inner insulation part 251 is disposed between the first guide plate body 221 and the first mounting part 11, the second inner insulation part 252 is disposed between the second guide plate body 222 and the connecting part 13, and the third inner insulation part 253 is disposed between the third guide plate body 223 and the second mounting part 12. In addition, in order to ensure the sealing between the electrode module 2 and the cover plate body 1 and to prevent electrolyte leakage, the electrode module 2 also includes a sealing ring 26 corresponding to the conductive electrode post 23, and the sealing ring 26 is sleeved on the conductive electrode post 23.

[0044] Optionally, such as Figures 3 to 4 As shown, the distance between the surface of the protective part 14 away from the electrode group 100 and the surface of the second mounting part 12 away from the electrode group 100 along the second direction is H1, and the distance between the surface of the first mounting part 11 away from the electrode group 100 and the surface of the second mounting part 12 away from the electrode group 100 along the second direction is H2, and satisfies 7.5mm≤H1-H2≤20mm.

[0045] By limiting the difference between the distance H1 between the surface of the protective part 14 away from the electrode group 100 and the surface of the second mounting part 12 away from the electrode group 100 along the second direction and the distance H2 between the surface of the first mounting part 11 away from the electrode group 100 and the surface of the second mounting part 12 away from the electrode group 100 along the second direction, the height of the protrusion of the protective part 14 is essentially limited. On the one hand, this avoids the difference between the two being too small, resulting in insufficient height of the protrusion of the protective part 14, which would reduce the size of the expansion cavity 143 of the protective part 14 for expanding the capacity of the electrode group 100, thus limiting the capacity expansion of the electrode group 100 and failing to meet the power supply requirements of the battery. On the other hand, since the protective part 14 is formed by a stretching and stamping process, for a fixed material thickness, the height that the protective part 14 can form has a limit. The higher the height, the smaller the wall thickness of the protective part 14, and the greater the difficulty of forming. Therefore, if the height of the protective part 14 is too large, the height of the protrusion of the protective part 14 will be too high, thereby increasing the difficulty of forming and reducing the structural strength of the protective part 14.

[0046] The difference between the distance H1 between the surface of the protective part 14 away from the electrode group 100 and the surface of the second mounting part 12 away from the electrode group 100 along the second direction and the distance H2 between the surface of the first mounting part 11 away from the electrode group 100 and the surface of the second mounting part 12 away from the electrode group 100 along the second direction can be any value between 7.5mm and 20mm or any range between two values, such as 7.5mm, 10mm, 12.5mm, 15mm, 17.5mm, 20mm, etc.

[0047] Optionally, such as Figures 3 to 4 As shown, the distance between the side of the first mounting part 11 away from the connecting part 13 and the side of the second mounting part 12 away from the connecting part 13 along the first direction is W1, and the length of the connecting top plate 21 along the first direction is W2, and satisfies 7mm≤W1-W2≤16mm.

[0048] By limiting the difference between the distance W1 along the first direction between the side of the first mounting part 11 away from the connecting part 13 and the side of the second mounting part 12 away from the connecting part 13 and the length W2 along the first direction of the connecting top plate 21, such that 7mm≤W1-W2≤16mm is satisfied, on the one hand, the pole module 2 is prevented from being too close to the junction of the protective part 14 and the first mounting part 11 or the boundary of the second mounting part 12, which would result in too little space for riveting operations, making the riveting operation more difficult and inconvenient for connecting the pole module 2 to the cover plate body 1. On the other hand, the distance between the pole module 2 and the junction of the protective part 14 and the first mounting part 11 or the boundary of the second mounting part 12 is prevented from being too large, which would result in compressing the size of the pole module 2, reducing the current flow area, reducing the current flow capacity, and failing to meet the current flow requirements of the battery.

[0049] The difference between the spacing W1 along the first direction between the side of the first mounting part 11 away from the connecting part 13 and the side of the second mounting part 12 away from the connecting part 13 and the length W2 of the connecting top plate 21 along the first direction can be any value between 7mm and 16mm or any range between two values, such as 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, etc.

[0050] Optionally, such as Figures 3 to 4 As shown, the length dimension of the cover plate body 1 along the first direction is A, and satisfies 0.48≤W1 / A≤0.7. By limiting the ratio between the distance dimension W1 along the first direction between the side of the first mounting part 11 away from the connecting part 13 and the side of the second mounting part 12 away from the connecting part 13, and the length dimension A of the cover plate body 1 along the first direction, so that it satisfies 0.48≤W1 / A≤0.7, on the one hand, it avoids the total length of the first mounting part 11, the connecting part 13 and the second mounting part 12 being too small, resulting in too small space for mounting the terminal module 2, thereby compressing the size of the terminal module 2, reducing the current flow area, reducing the current flow capacity, and failing to meet the current flow requirements of the battery. On the other hand, it avoids the total length of the first mounting part 11, the connecting part 13 and the second mounting part 12 being too large, resulting in compressing the size of the protective part 14, reducing the size of the expansion cavity 143 of the protective part 14 for expanding the capacity of the electrode group 100, making the expansion of the electrode group 100 limited, and failing to meet the power supply requirements of the battery.

[0051] The ratio of the distance W1 between the side of the first mounting part 11 away from the connecting part 13 and the side of the second mounting part 12 away from the connecting part 13 along the first direction to the length A of the cover plate body 1 along the first direction can be any value between 0.48 and 0.7 or any range between any two values, such as 0.48, 0.524, 0.568, 0.612, 0.656, 0.7, etc.

[0052] 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.

[0053] Table 1

[0054]

[0055] A comparison of Examples 1 to 6 with Comparative Examples 1 to 2 reveals that when the difference between the distance H1 between the surface of the protective part 14 away from the electrode group 100 and the surface of the second mounting part 12 away from the electrode group 100 along the second direction and the distance H2 between the surface of the first mounting part 11 away from the electrode group 100 and the surface of the second mounting part 12 away from the electrode group 100 along the second direction is less than the minimum value within the range of 7.5mm ≤ H1 - H2 ≤ 20mm, the difference is too small, resulting in insufficient height of the protective part 14 protrusion, thus reducing the expansion cavity of the protective part 14 used for expanding the electrode group 100. The size of 143 limits the expansion of the electrode group 100, which does not meet the power supply requirements of the battery. When the difference between the distance H1 between the protective part 14 and the second mounting part 12 and the second mounting part 12 along the second direction is greater than the maximum value of 7.5mm≤H1-H2≤20mm, the height of the protective part 14 is too large, the height of the protective part 14 protrudes too much, which makes it difficult to form and results in low structural strength of the protective part 14.

[0056] A comparison of Examples 1 to 6 with Comparative Examples 3 to 4 reveals that when the difference between the distance W1 along the first direction between the side of the first mounting part 11 away from the connecting part 13 and the side of the second mounting part 12 away from the connecting part 13 and the length W2 along the first direction of the connecting top plate 21 is less than the minimum value within the range of 7mm ≤ W1 - W2 ≤ 16mm, the pole post module 2 is too close to the junction of the protective part 14 and the first mounting part 11 or the boundary of the second mounting part 12. This results in insufficient space for riveting operations, making the riveting process more difficult and inconvenient. When the terminal module 2 is connected to the cover body 1, if the difference between the distance W1 along the first direction between the side of the first mounting part 11 away from the connecting part 13 and the side of the second mounting part 12 away from the connecting part 13 and the length W2 along the first direction of the connecting top plate 21 is greater than the maximum value of the range 7mm≤W1-W2≤16mm, then the distance between the terminal module 2 and the junction of the protective part 14 and the first mounting part 11 or the boundary of the second mounting part 12 is too large, which will compress the size of the terminal module 2, reduce the current flow area, reduce the current flow capacity, and fail to meet the current flow requirements of the battery.

[0057] A comparison of Examples 1 to 6 with Comparative Examples 5 to 6 reveals that when the ratio of the distance W1 between the side of the first mounting portion 11 away from the connecting portion 13 and the side of the second mounting portion 12 away from the connecting portion 13 along the first direction to the length A of the cover body 1 along the first direction is less than the minimum value in the range 0.48 ≤ W1 / A ≤ 0.7, the total length of the first mounting portion 11, the connecting portion 13, and the second mounting portion 12 is too small. This results in insufficient space for mounting the pole module 2, thereby compressing the size of the pole module 2, reducing the flow area, and decreasing the flow capacity, thus failing to meet requirements. To meet the overcurrent requirements of the battery, when the ratio between the distance W1 along the first direction between the side of the first mounting part 11 away from the connecting part 13 and the side of the second mounting part 12 away from the connecting part 13 and the length A along the first direction of the cover body 1 is greater than the maximum value in the range 0.48≤W1 / A≤0.7, the total length of the first mounting part 11, the connecting part 13 and the second mounting part 12 is too large, which leads to the compression of the size of the protective part 14 and the reduction of the size of the expansion cavity 143 of the protective part 14 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.

[0058] Optionally, such as Figures 3 to 4 As shown, the conductive electrode post 23 includes a first column portion 231, a second column portion 232, and a limiting portion 233. The flow guide base plate 22 has a stepped through hole including a first hole segment 224 and a second hole segment 225, and a limiting step surface 226 is formed between the first hole segment 224 and the second hole segment 225. The stepped through hole corresponds one-to-one with the conductive electrode post 23. The first column portion 231 is inserted into the first hole segment 224, and the limiting portion 233 is inserted into the second hole segment 225 and abuts against the limiting step surface 226. The first column portion 231 passes through the cover plate body 1 and is connected to the connecting top plate 21.

[0059] The conductive electrode post 23 is formed by the first column part 231, the second column part 232 and the limiting part 233. A stepped through hole including the first hole section 224 and the second hole section 225 is opened on the flow guide base plate 22, so as to facilitate the connection between the conductive electrode post 23 and the flow guide base plate 22. The contact area between the flow guide base plate 22 and the conductive electrode post 23 is increased by the abutment of the limiting part 233 and the limiting step surface 226, which facilitates the subsequent connection between the two by welding.

[0060] In this embodiment, the cross-sectional areas of the first column portion 231, the second column portion 232, and the limiting portion 233 are all elliptical, thereby increasing the contact area between the conductive electrode column 23 and the connecting top plate 21 and improving the current carrying capacity.

[0061] Optionally, such as Figures 3 to 4As shown, the height dimension of the guide plate 22 along the second direction is L1, and the distance dimension between the limiting step surface 226 and the surface of the guide plate 22 facing the pole group 100 is L2, and satisfies 0.8mm≤L1-L2≤1.8mm.

[0062] By limiting the difference between the height dimension L1 of the guide plate 22 along the second direction and the distance dimension L2 between the limiting step surface 226 and the surface of the guide plate 22 facing the electrode assembly 100, the depth of the second hole segment 225 is essentially limited to satisfy 0.8mm≤L1-L2≤1.8mm. This avoids the second hole segment 225 being too shallow, unable to match the thickness of the limiting part 233, causing the limiting part 233 to protrude from the guide plate 22 and affect subsequent assembly. On the other hand, it avoids the second hole segment 225 being too deep, causing the distance dimension L2 between the limiting step surface 226 and the surface of the guide plate 22 facing the electrode assembly 100 to be too small, resulting in weak structural strength and causing the conductive electrode post 23 to deform under stress when riveted to the connecting top plate 21.

[0063] The difference between the height dimension L1 of the guide plate 22 along the second direction and the distance dimension L2 between the limiting step surface 226 and the surface of the guide plate 22 facing the pole group 100 can be any value between 0.8mm and 1.8mm or any two values, such as 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, etc.

[0064] Optionally, such as Figure 4 , Figure 5 As shown, the protective part 14 includes a protective top plate 141 and a plurality of enclosure side plates 142 surrounding the protective top plate 141. One of the plurality of enclosure side plates 142 connected to the first mounting part 11 is inclined. The thickness of the enclosure side plate 142 is T1, and the thickness of the protective top plate 141 is T2, and the thickness satisfies 0.5≤T1 / T2≤0.8.

[0065] Since the protective part 14 is formed by a stamping and stretching process, the side panel 142 surrounding the protective top plate 141 on the protective part 14 will become thinner due to stretching during the forming process. The thickness of the protective top plate 141 is basically equal to the thickness of the plate before forming. Therefore, by limiting the ratio between the thickness T1 and the thickness T2 to satisfy 0.5≤T1 / T2≤0.8, the side panel 142 is prevented from being too thin relative to the protective top plate 141, which would result in poor structural strength of the side panel 142 and failure to provide effective protection for the pole assembly 100 inserted into the protective part 14, thus increasing the probability of damage due to impact. On the other hand, the side panel 142 is also prevented from being too thick relative to the protective top plate 141, which would increase the difficulty of forming.

[0066] The ratio between the thickness T1 of the side panel 142 of the enclosure and the thickness T2 of the protective top panel 141 can be any value between 0.5 and 0.8 or any range between two values, such as 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, etc.

[0067] 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 142 connected to the first mounting part 11 and is disposed on the surface of the enclosure side plate 142 facing the expansion cavity 143. The fifth inner insulation part 255 is disposed on the surface of the protective top plate 141 facing the expansion cavity 143.

[0068] Optionally, such as Figure 4 As shown, the angle between the connecting part 13 and the second mounting part 12 on the side away from the pole group 100 is N, and satisfies 105°≤N≤150°.

[0069] By limiting the included angle N between the connecting part 13 and the second mounting part 12 on the side away from the electrode group 100 to satisfy 105°≤N≤150°, on the one hand, the included angle N is avoided from being too small, which would cause the connecting part 13 and the second mounting part 12 to tend to be perpendicular, thus failing to effectively alleviate the stress concentration problem, and thus causing cracks to easily appear at the junction of the connecting part 13 and the second mounting part 12, reducing the service life of the cover plate body 1. On the other hand, the included angle N is avoided from being too large, which would reduce the height of the first mounting part 11, thereby compressing the space of the expansion cavity 143 below the first mounting part 11 for expanding the capacity 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.

[0070] The angle N between the connecting part 13 and the second mounting part 12 on the side away from the pole group 100 can be any value between 105° and 150° or any range between two values, such as 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150°, etc.

[0071] 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.

[0072] Table 2

[0073]

[0074] A comparison of Examples 7 to 12 with Comparative Examples 7 to 8 reveals that when the difference between the height dimension L1 of the guide plate 22 along the second direction and the distance dimension L2 between the limiting step surface 226 and the surface of the guide plate 22 facing the pole assembly 100 is less than the minimum value in the range 0.8mm ≤ L1 - L2 ≤ 1.8mm, the depth of the second hole segment 225 is too shallow and cannot accommodate the thickness of the limiting part 233, causing the limiting part 233 to protrude from the guide plate 22, affecting subsequent assembly. When the difference between the height dimension L1 of plate 22 along the second direction and the distance dimension L2 between the limiting step surface 226 and the surface of the guide plate 22 facing the electrode group 100 is greater than the maximum value of the range 0.8mm≤L1-L2≤1.8mm, the depth of the second hole section 225 is too large, resulting in the distance dimension L2 between the limiting step surface 226 and the surface of the guide plate 22 facing the electrode group 100 being too small, and its structural strength is too weak, causing the conductive electrode post 23 to deform under stress when riveted to the connecting top plate 21.

[0075] A comparison of Examples 7 to 12 with Comparative Examples 9 to 10 shows that when the ratio between thickness dimension T1 and thickness dimension T2 is less than the minimum value in the range 0.5 ≤ T1 / T2 ≤ 0.8, the side panel 142 of the enclosure is too thin relative to the protective top plate 141, resulting in poor structural strength of the side panel 142, which cannot provide effective protection for the pole assembly 100 inserted into the protective part 14, thus increasing the probability of damage due to impact. When the ratio between thickness dimension T1 and thickness dimension T2 is greater than the maximum value in the range 0.5 ≤ T1 / T2 ≤ 0.8, the side panel 142 of the enclosure is too thick relative to the protective top plate 141, thereby increasing the difficulty of molding.

[0076] A comparison of Examples 7 to 12 with Comparative Examples 11 to 12 reveals that when the angle N between the connecting portion 13 and the second mounting portion 12 on the side away from the electrode group 100 is less than the minimum value of the range 105°≤N≤150°, the connecting portion 13 and the second mounting portion 12 tend to be perpendicular, thus failing to effectively alleviate the stress concentration problem. Consequently, cracks are prone to appear at the junction of the connecting portion 13 and the second mounting portion 12, reducing the service life of the cover body 1. When the angle N between the connecting portion 13 and the second mounting portion 12 on the side away from the electrode group 100 is greater than the maximum value of the range 105°≤N≤150°, the height of the first mounting portion 11 is low, thereby compressing the space of the expansion cavity 143 below the first mounting portion 11 used for expanding the electrode group 100, resulting in limited expansion of the electrode group 100 and failing to meet the energy supply requirements of the battery.

[0077] In this embodiment, as Figure 6 , Figure 7As 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 receiving 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.

[0078] 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.

[0079] In addition, the battery can also be a prismatic battery. Since the electrode module 2 of the battery cover is provided with two conductive electrode posts 23, when the battery is a prismatic battery, one of the conductive electrode posts 23 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.

[0080] Optionally, such as Figure 7 As shown, the electrode assembly 100 includes an electrode assembly body 101 and electrode tabs 102. The electrode assembly body 101 includes a first mounting surface 1011, a second mounting surface 1012, a connecting surface 1013, and an expansion boss 1014. The connecting surface 1013 is inclinedly disposed between the first mounting surface 1011 and the second mounting surface 1012 and is parallel to the connecting portion 13. The first mounting surface 1011 is disposed on the side of the connecting surface 1013 near the first mounting portion 11, and the second mounting surface 1012 is disposed on the side of the connecting surface 1013 near the second mounting portion 12. The expansion boss 1014 is disposed on the side of the first mounting portion 11 away from the connecting surface 1013. A portion of the electrode tab 102 is provided on the first mounting surface 1011, the second mounting surface 1012, and the connecting surface 1013.

[0081] By providing a portion of the tab 102 on the first mounting surface 1011, the second mounting surface 1012, and the connecting surface 1013, the area of ​​the tab 102 is increased, thereby improving the current carrying capacity. Furthermore, by providing the expansion boss 1014, the volume of the electrode assembly 100 is increased, thereby improving the capacity. When the electrode assembly 100 is inserted into the housing, the thrust is applied to the expansion boss 1014, thereby preventing the tab 102 from being subjected to force. This achieves protection for the tab 102 when the electrode assembly 100 is inserted into the housing, preventing the tab 102 from being easily desoldered or damaged due to the thrust during insertion.

[0082] 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 first mounting part, a second mounting part, a connecting part, and a protective part. The first mounting part, the second mounting part, and the connecting part are all solid flat plate structures. The connecting part is inclined and includes a low end close to the electrode group and a high end away from the electrode group. The high end is connected to the first mounting part, and the low end is connected to the second mounting part. The protective part is a hollow protrusion structure formed by the indentation of the cover plate body from the inside towards the electrode group to the outside away from the electrode group. The protective part has an expansion cavity inside and is connected to the side of the first mounting part away from the connecting part. An electrode module includes a connecting top plate, a flow guiding bottom plate, and two conductive electrode posts. The two conductive electrode posts are insulated from and connected to the first mounting part and the second mounting part, respectively. 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 part away from the electrode group. The distance between the surface of the protective part away from the electrode group and the surface of the second mounting part away from the electrode group along the second direction is H1, and the distance between the surface of the first mounting part away from the electrode group and the surface of the second mounting part away from the electrode group along the second direction is H2, and satisfies 7.5mm≤H1-H2≤20mm; The distance between the side of the first mounting part away from the connecting part and the side of the second mounting part away from the connecting part along the first direction is W1, and the length of the connecting top plate along the first direction is W2, and satisfies 7mm≤W1-W2≤16mm; The length dimension of the cover plate body along the first direction is A, and satisfies 0.48≤W1 / A≤0.

7. The length direction of the battery cover plate is the first direction, and the thickness direction of the battery cover plate is the second direction.

2. The battery cover according to claim 1, characterized in that, The conductive electrode post includes a first column portion, a second column portion, and a limiting portion. The flow guide base plate has a stepped through hole including a first hole segment and a second hole segment, and a limiting step surface is formed between the first hole segment and the second hole segment. The stepped through hole corresponds one-to-one with the conductive electrode post. The first column portion is inserted into the first hole segment, and the limiting portion is inserted into the second hole segment and abuts against the limiting step surface. The first column portion passes through the cover plate body and is connected to the connecting top plate.

3. The battery cover according to claim 2, characterized in that, The height dimension of the flow guide plate along the second direction is L1, and the distance dimension between the limiting step surface and the surface of the flow guide plate facing the pole group is L2, and satisfies 0.8mm≤L1-L2≤1.8mm.

4. The battery cover according to claim 1, characterized in that, The protective part includes a protective top plate and a plurality of enclosure side plates surrounding the protective top plate, wherein one of the plurality of enclosure side plates connected to the first mounting part is inclined. The thickness of the side panel of the enclosure is T1, and the thickness of the protective top panel is T2, and both satisfy 0.5≤T1 / T2≤0.

8.

5. The battery cover according to claim 1, characterized in that, The angle between the connecting part and the second mounting part on the side away from the pole group is N, and satisfies 105°≤N≤150°.

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

7. The battery according to claim 6, characterized in that, The electrode assembly includes an electrode assembly body and electrode tabs. The electrode assembly body includes a first mounting surface, a second mounting surface, a connecting surface, and an expansion boss. The connecting surface is inclined between the first mounting surface and the second mounting surface and is parallel to the connecting portion. The first mounting surface is located on the side of the connecting surface near the first mounting portion, and the second mounting surface is located on the side of the connecting surface near the second mounting portion. The expansion boss is located on the side of the first mounting portion away from the connecting surface. A portion of the electrode tab is provided on the first mounting surface, the second mounting surface, and the connecting surface.

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