Battery cover plate and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery cover plate and a battery. The battery cover plate comprises a cover plate body and a pole module, wherein the cover plate body comprises a mounting part, a connecting part and a protecting part; mounting parts are arranged on the two sides of the protection part in the first direction, the inclined connecting part is arranged between the protection part and the mounting parts, the high-position end of the inclined connecting part is connected with the protection part, and the low-position end of the inclined connecting part is connected with the mounting parts, so that a containing groove is formed in the cover plate body. The mounting part is connected with a pole module in an insulating manner; and the outer side part of the pole module penetrates through the mounting part and is lower than the protection part. According to the structure, the protruding space of the pole module can be utilized, the occupation of the outer side is reduced, the assembling rate of the battery module is improved, and the pole module is protected; the accommodating groove is formed in the side, facing the pole group, of the cover plate body, so that the space below the protection part is enlarged, the size is increased, the capacity is improved, the pole column modules are arranged on the mounting parts on the two sides of the protection part, a multi-pole column structure is formed, the over-current area can be increased, and the over-current capability can be improved.

Description

Technical Field

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

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

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

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

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

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

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

[0008] The cover plate body includes a mounting part, a connecting part, and a protective part. The protective part has the mounting part on both sides along a first direction. The connecting part is inclinedly disposed between the protective part and the mounting part. The connecting part has a high end and a low end. The high end is connected to the protective part, and the low end is connected to the mounting part, so as to form an accommodating groove on the side of the cover plate body facing the pole group.

[0009] The pole module corresponds one-to-one with the mounting part. The pole module is insulatedly connected to the corresponding mounting part. One side of the pole module is located inside the cover plate body and is connected to the electrode tab on the pole group. The other side of the pole module passes through the mounting part and is located outside the cover plate body. The part of the pole module located outside the cover plate body is lower than the protective part.

[0010] Optionally, the battery cover further includes a support end plate, which is disposed between the cover body and the electrode assembly and abuts against the electrode assembly. The support end plate includes a first support portion and a second support portion. The first support portion is a hollow protrusion structure formed by the surface of the support end plate facing the electrode assembly and protruding away from the surface of the electrode assembly, with an expanded cavity inside. The first support portion is inserted into the receiving groove, and the second support portion is disposed on both sides of the first support portion along the first direction and located below the mounting portion.

[0011] Optionally, the length of the support end plate along the first direction is A, and the length of the second support part along the first direction is W, and the condition 0.4≤2×W / A≤0.6 is met.

[0012] Optionally, the distance between the surface of the second support portion that abuts against the electrode group and the surface of the second support portion that is away from the electrode group along the second direction is H1, and the distance between the surface of the first support portion that abuts against the electrode group and the surface of the first support portion that is away from the electrode group along the second direction is H2, and satisfies 8.5mm≤H2-H1≤25mm.

[0013] Optionally, the distance H1 between the surface of the second support portion that abuts against the pole group and the surface of the second support portion that is away from the pole group along the second direction satisfies 5mm≤H1≤9mm.

[0014] Optionally, the second support portion has a receiving groove on the side facing the cover plate body, and a through elongated hole that passes through the second support portion and communicates with the receiving groove.

[0015] Optionally, the width of the through hole along a third direction is L1, and satisfies 2.8mm≤L1≤7mm.

[0016] Optionally, the second support portion includes a bottom wall facing the electrode assembly and a side wall surrounding the bottom wall. The bottom wall includes an abutment portion and a guide portion. The abutment portion is connected to the side wall, and the guide portion is connected to the side of the abutment portion away from the side wall. The guide portion is inclined so that the side of the guide portion away from the abutment portion is away from the electrode assembly. The through-hole is located between the two guide portions.

[0017] Optionally, the width dimension of the abutting portion along the third direction is L2, and the width dimension of the second supporting portion along the third direction is B, and satisfies 0.18≤2×L2 / B≤0.4.

[0018] On the other hand, a battery is provided, the battery including an electrode assembly, a battery housing and a battery cover as described in any of the preceding claims, the battery housing being a hollow housing structure having at least one opening, and the battery cover being disposed at the opening of the battery housing to close the battery housing and form a receiving cavity for accommodating the electrode assembly.

[0019] The beneficial effects of this invention are:

[0020] This invention provides a battery cover plate. The cover plate body is designed with a mounting portion, a connecting portion, and a protective portion. The mounting portion is connected to the lower end of the inclined connecting portion, and the protective portion is connected to the higher end of the inclined connecting portion. This causes the portion of the terminal module connected to the mounting portion, located outside the cover plate body, to be lower than the protective portion. This effectively utilizes the space previously occupied by the protruding terminal module, reducing the space occupied on the outer side of the battery cover plate and increasing the battery module assembly rate. Furthermore, the protruding protective portion provides protection for the terminal module, preventing damage from impacts. Additionally, a recessed accommodating groove is formed on the side of the cover plate body facing the terminal module, expanding the space below the protective portion. This allows the terminal module to increase in volume and capacity by utilizing the space below the protective portion. Moreover, since mounting portions are provided on both sides of the protective portion, and each mounting portion is connected to a terminal module, a multi-terminal structure is formed, increasing the current flow area and improving current flow capacity.

[0021] The present invention also provides a battery that, by applying the aforementioned battery cover, not only reduces the external space occupied but also expands the internal space, thereby increasing the volume of the electrode assembly and enhancing the power supply capacity. Attached Figure Description

[0022] Figure 1 This is an assembly diagram of the cover plate body and the terminal module in the battery cover plate provided by the present invention;

[0023] Figure 2 This is a structural cross-sectional view of the cover plate body and the terminal module in the battery cover plate provided by the present invention;

[0024] Figure 3 This is a structural schematic diagram of the support end plate in the battery cover provided by the present invention from the top view.

[0025] Figure 4 This is a structural schematic diagram of the support end plate in the battery cover provided by the present invention from the bottom view.

[0026] Figure 5 This is a structural cross-sectional view of the longitudinal section of the support end plate in the battery cover provided by the present invention;

[0027] Figure 6 This is a cross-sectional view of the second support portion of the support end plate in the battery cover provided by the present invention.

[0028] Figure 7 This is a partial structural diagram of a battery using the battery cover provided by the present invention;

[0029] Figure 8 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. Capacity expansion boss; 1012. Mounting surface; 102. Electrode tab; 200. Battery casing;

[0032] 1. Cover plate body; 11. Mounting part; 12. Connecting part; 13. Protective part; 14. Accommodating groove; 15. Reinforcing rib structure;

[0033] 2. Electrode post module; 21. Conductive electrode post; 22. Outer insulating component; 23. Inner insulating component; 24. Riveting block; 25. Sealing ring;

[0034] 3. Support end plate; 31. First support part; 311. Expanded cavity; 32. Second support part; 321. Receiving groove; 322. Through elongated hole; 323. Connecting hole; 324. Bottom wall; 3241. Abutting part; 3242. Guide part; 325. Side wall. 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 height direction of the battery cover is defined as the second direction, and the width direction of the battery cover is defined as the third direction.

[0041] like Figures 1 to 6As shown, the battery cover includes a cover body 1 and a terminal module 2. The cover body 1 includes a mounting part 11, a connecting part 12, and a protective part 13. The protective part 13 has mounting parts 11 on both sides along the first direction. The connecting part 12 is inclinedly disposed between the protective part 13 and the mounting part 11. The connecting part 12 has a high end and a low end. The high end is connected to the protective part 13, and the low end is connected to the mounting part 11, so as to form a receiving groove 14 on the side of the cover body 1 facing the electrode group 100. The terminal module 2 corresponds to the mounting part 11 one by one. The terminal module 2 is insulatedly connected to the corresponding mounting part 11. One side of the terminal module 2 is located inside the cover body 1 and is connected to the electrode tab 102 on the electrode group 100. The other side of the terminal module 2 passes through the mounting part 11 and is located outside the cover body 1. The part of the terminal module 2 located outside the cover body 1 is lower than the protective part 13.

[0042] The battery cover is designed with a cover body 1 consisting of a mounting part 11, a connecting part 12, and a protective part 13. The mounting part 11 is connected to the lower end of the inclined connecting part 12, and the protective part 13 is connected to the higher end of the inclined connecting part 12. This results in the portion of the terminal module 2 connected to the mounting part 11 located outside the cover body 1 being lower than the protective part 13. This effectively utilizes the space that would otherwise be occupied by the terminal module 2 protruding from the cover body 1, reducing the space occupied on the outside of the battery cover and improving the battery module assembly rate. Furthermore, the protruding protective part 13 provides protection for the pole module 2, preventing damage caused by bumps. On the other hand, since a receiving groove 14 is formed on the side of the cover plate body 1 facing the pole group 100, the space below the protective part 13 is expanded, allowing the pole group 100 to increase its volume and capacity by utilizing the space below the protective part 13. In addition, since mounting parts 11 are provided on both sides of the protective part 13, and each mounting part 11 is connected to the pole module 2, a multi-pole structure is formed, increasing the flow area and improving the flow capacity.

[0043] In this embodiment, as Figure 1 , Figure 2As shown, the electrode module 2 includes a conductive electrode post 21, an outer insulating component 22, an inner insulating component 23, and a riveting block 24. The conductive electrode post 21 includes a column part and a plate part. The column part passes through the mounting part 11 and is riveted to the riveting block 24. The outer insulating component 22 is located between the riveting block 24 and the mounting part 11, and the inner insulating component 23 is located between the plate part and the mounting part 11. The plate part is used to weld to the electrode tab 102 of the electrode assembly 100. Therefore, the part of the electrode module 2 that extends beyond the outer side of the cover plate body 1 is the total height of the riveting block 24 and the outer insulating component 22. The projection of the riveting block 24 and the outer insulating component 22 on the mounting part 11 does not exceed the mounting part 11, thereby avoiding damage in the event of an impact. In order to increase the contact area between the column part and the riveting block 24 and improve the flow area, the cross-section of the column part is elliptical. In addition, in order to ensure sealing, the electrode module 2 also includes a sealing ring 25, which is sleeved on the outside of the column part. In addition, to improve structural strength, the cover plate body 1 is provided with reinforcing ribs 15 on the protective part 13 and the connecting part 12.

[0044] Optionally, such as Figure 3 , Figure 4 As shown, the battery cover also includes a support end plate 3. The support end plate 3 is disposed between the cover body 1 and the electrode group 100 and abuts against the electrode group 100. The support end plate 3 includes a first support part 31 and a second support part 32. The first support part 31 is a hollow protrusion structure formed by the surface of the support end plate 3 facing the electrode group 100 and protruding away from the surface of the electrode group 100. It has an expansion cavity 311 inside. The first support part 31 is inserted into the receiving groove 14. The second support part 32 is disposed on both sides of the first support part 31 along the first direction and is located below the mounting part 11.

[0045] By providing a support end plate 3 that abuts against the pole group 100 between the cover plate body 1 and the pole group 100, the pole group 100 is prevented from shaking when subjected to external impact. Furthermore, by making the first support part 31 a hollow protruding structure with an expansion cavity 311 inside, the pole group 100 can increase its volume and capacity by utilizing the space inside the expansion cavity 311.

[0046] Optionally, such as Figure 5 As shown, the length dimension of the support end plate 3 along the first direction is A, and the length dimension of the second support part 32 along the first direction is W, and satisfies 0.4≤2×W / A≤0.6.

[0047] Since the support end plate 3 has two second support portions 32 located on both sides of the first support portion 31, the relationship 2×W / A represents the ratio of the total length of the second support portion 32 to the length of the support end plate 3. Furthermore, since the first support portion 31 is a hollow protruding structure, the second support portion 32 is the part of the support end plate 3 that actually contacts the pole assembly 100. Therefore, by limiting the ratio of the total length dimension 2×W of the second support portion 32 to the length dimension A of the support end plate 3 along the first direction, it is ensured that 0.4 ≤ W / A. 2×W / A≤0.6, thus avoiding the second support part 32 being too small relative to the support end plate 3, resulting in a small contact area between the second support part 32 and the electrode group 100, thereby reducing the support strength for the electrode group 100. On the other hand, it avoids the second support part 32 being too large relative to the support end plate 3, thereby compressing the first support part 31, and reducing the size of the expansion cavity 311 of the first support part 31 for expanding the capacity of the electrode group 100, so that the expansion of the electrode group 100 is limited and does not meet the energy supply requirements of the battery.

[0048] The ratio between the total length dimension 2×W of the second support part 32 and the length dimension A of the support end plate 3 along the first direction can be any value between 0.4 and 0.6 or any range between two values, such as 0.4, 0.45, 0.5, 0.55, 0.6, etc.

[0049] Optionally, such as Figure 5 As shown, the distance between the surface of the second support 32 that abuts against the pole group 100 and the surface of the second support 32 that is away from the pole group 100 along the second direction is H1, and the distance between the surface of the first support 31 that abuts against the pole group 100 and the surface of the first support 31 that is away from the pole group 100 along the second direction is H2, and satisfies 8.5mm≤H2-H1≤25mm.

[0050] By limiting the difference between the distance H2 along the second direction between the surface of the first support 31 abutting against the pole group 100 and the surface of the first support 31 away from the pole group 100, and the distance H1 along the second direction between the surface of the second support 32 abutting against the pole group 100 and the surface of the second support 32 away from the pole group 100, the height difference between the first support 31 and the second support 32 is actually limited. By ensuring that it satisfies 8.5mm≤H2-H1≤25mm, this avoids the height difference between the first support 31 and the second support 32 being too small, which would cause the first support to... The insufficient height of the support portion 31 reduces the size of the expansion cavity 311 of the first support portion 31 for expanding the capacity of the electrode assembly 100, resulting in limited capacity expansion of the electrode assembly 100 and failing to meet the energy supply requirements of the battery. On the other hand, since the first support portion 31 is formed by a stretching and stamping process, for a fixed material thickness, the height that the first support portion 31 can form has a limit. The higher the height, the smaller the wall thickness of the first support portion 31 will be, and the greater the difficulty of forming. Therefore, if the height difference is too large, the height of the first support portion 31 will be too high, thereby increasing the difficulty of forming and reducing the structural strength of the first support portion 31.

[0051] The difference between the distance H2 along the second direction between the surface of the first support 31 that abuts against the pole group 100 and the surface of the first support 31 that is away from the pole group 100 and the distance H1 along the second direction between the surface of the second support 32 that abuts against the pole group 100 and the surface of the second support 32 that is away from the pole group 100 can be any value between 8.5mm and 25mm or any two values, such as 8.5mm, 11.8mm, 15.1mm, 18.4mm, 21.7mm, 25mm, etc.

[0052] Optionally, such as Figure 5 As shown, the distance H1 between the surface of the second support 32 that abuts against the pole group 100 and the surface of the second support 32 that is away from the pole group 100 along the second direction satisfies 5mm≤H1≤9mm.

[0053] By further limiting the distance H1 along the second direction between the surface of the second support 32 that abuts against the electrode assembly 100 and the surface of the second support 32 that is away from the electrode assembly 100, so that it satisfies 5mm≤H1≤9mm, on the one hand, the height of the second support 32 along the second direction is avoided from being too small, resulting in weak structural strength and insufficient support for the electrode assembly 100; on the other hand, the height of the second support 32 along the second direction is avoided from being too large, resulting in excessive space occupation, thereby compressing the volume of the electrode assembly 100, reducing capacity, and thus failing to meet the energy supply requirements of the battery.

[0054] The distance H1 between the surface of the second support 32 that abuts against the pole group 100 and the surface of the second support 32 that is away from the pole group 100 along the second direction can be any value between 5mm and 9mm or any range between two values, such as 5mm, 6mm, 7mm, 8mm, 9mm, etc.

[0055] In this embodiment, in order to verify the influence of the various parameter limitations of the support end plate 3 on the battery cover provided in this embodiment, as shown in Table 1, six sets of embodiments and four sets of comparative examples are provided for verification.

[0056] Table 1

[0057]

[0058] A comparison of Examples 1 to 6 with Comparative Examples 1 to 2 reveals that when the ratio between the total length dimension 2×W of the second support portion 32 and the length dimension A of the support end plate 3 along the first direction is less than the minimum value in the range 0.4≤2×W / A≤0.6, the proportion of the second support portion 32 relative to the support end plate 3 is too small, resulting in a small contact area between the second support portion 32 and the electrode assembly 100, thereby reducing the support strength for the electrode assembly 100. When the ratio between the total length dimension 2×W of the second support portion 32 and the length dimension A of the support end plate 3 along the first direction is greater than the maximum value in the range 0.4≤2×W / A≤0.6, the proportion of the second support portion 32 relative to the support end plate 3 is too large, resulting in compression of the first support portion 31, thereby reducing the size of the expansion cavity 311 of the first support portion 31 used for the expansion of the electrode assembly 100, making the expansion of the electrode assembly 100 limited and failing to meet the energy supply requirements of the battery.

[0059] A comparison of Examples 1 to 6 with Comparative Examples 3 to 4 reveals that when the difference between the distance H2 along the second direction between the surface of the first support 31 abutting the electrode assembly 100 and the surface of the first support 31 away from the electrode assembly 100, and the distance H1 along the second direction between the surface of the second support 32 abutting the electrode assembly 100 and the surface of the second support 32 away from the electrode assembly 100, is less than the minimum value within the range of 8.5mm ≤ H2 - H1 ≤ 25mm, the height difference between the first support 31 and the second support 32 is too small, resulting in insufficient protrusion height of the first support 31, thus reducing the use of the first support 31 for the electrode assembly 100. The size of the expansion cavity 311 with zero expansion limits the expansion of the electrode assembly 100, which does not meet the power supply requirements of the battery. When the difference between the distance H2 along the second direction between the surface of the first support 31 that abuts against the electrode assembly 100 and the surface of the first support 31 that is away from the electrode assembly 100 and the distance H1 along the second direction between the surface of the second support 32 that abuts against the electrode assembly 100 and the surface of the second support 32 that is away from the electrode assembly 100 is greater than the maximum value in the range of 8.5mm≤H2-H1≤25mm, the height difference is too large, resulting in the first support 31 protruding too high, which increases the molding difficulty and reduces the structural strength of the first support 31.

[0060] Optionally, such as Figure 6 As shown, the second support portion 32 has a receiving groove 321 on the side facing the cover plate body 1, and a through elongated hole 322 that penetrates the second support portion 32 and communicates with the receiving groove 321. By providing the receiving groove 321 and the through elongated hole 322 that communicates with the receiving groove 321 on the second support portion 32, not only can the electrode tab 102 be connected to the electrode post module 2 through the through elongated hole 322, but the receiving groove 321 also provides bending space for the electrode tab 102, and the side wall 325 of the receiving groove 321 provides protection for the internal electrode tab 102, preventing damage to the electrode tab 102.

[0061] In this embodiment, the support end plate 3 is integrally formed by injection molding, simultaneously forming a first support portion 31 and a second support portion 32, as well as a receiving groove 321 for accommodating the electrode tab 102 and a through-hole 322 for the electrode tab 102 to pass through. Furthermore, because the support end plate 3 formed by injection molding has a certain degree of elasticity, it acts as a buffer when subjected to impact, further improving the protection effect on the electrode assembly 100. In addition, to facilitate subsequent electrolyte injection operations and the flow of electrolyte during the injection process, the first support portion 31 is also provided with a connecting hole 323 that penetrates the receiving groove 321 and the expanded cavity 311.

[0062] Optionally, such as Figure 6As shown, the width of the through-hole 322 along the third direction is L1, and satisfies 2.8mm≤L1≤7mm. By limiting the width L1 of the through-hole 322 along the third direction to satisfy 2.8mm≤L1≤7mm, it avoids two problems: firstly, the width of the through-hole 322 is too small, which would cause the electrode tab 102 to easily rub against the second support part 32 when passing through the through-hole 322, resulting in damage to the electrode tab 102; secondly, it avoids the width of the through-hole 322 being too large, which would reduce the structural strength of the second support part 32 and prevent the second support part 32 from providing effective support for the electrode assembly 100.

[0063] The width L1 of the through hole 322 along a third direction can be any value between 2.8mm and 7mm or a range between any two values, such as 2.8mm, 4.2mm, 5.6mm, and 7mm.

[0064] Optionally, such as Figure 6 As shown, the second support portion 32 includes a bottom wall 324 facing the electrode assembly 100 and a side wall 325 surrounding the bottom wall 324. The bottom wall 324 includes an abutment portion 3241 and a guide portion 3242. The abutment portion 3241 is connected to the side wall 325, and the guide portion 3242 is connected to the side of the abutment portion 3241 away from the side wall 325. The guide portion 3242 is inclined so that the side of the guide portion 3242 away from the abutment portion 3241 is far away from the electrode assembly 100. The through hole 322 is located between the two guide portions 3242.

[0065] By designing the abutment part 3241 and the guide part 3242 to form the bottom wall 324 of the second support part 32, the inclined guide part 3242 is used to guide the tab 102 so that the tab 102 can pass through the through hole 322 better.

[0066] Optionally, such as Figure 6 As shown, the width dimension of the abutment part 3241 along the third direction is L2, and the width dimension of the second support part 32 along the third direction is B, and satisfies 0.18≤2×L2 / B≤0.4.

[0067] Since two abutment portions 3241 are provided on the bottom of the second support portion 32, the relationship 2×L2 / B represents the ratio of the total width of the abutment portion 3241 to the width of the support end plate 3. By limiting the ratio of the total width dimension 2×L2 of the abutment portion 3241 to the width dimension B of the support end plate 3, it is made to satisfy 0.18≤2×L2 / B≤0.4. This avoids the total width of the abutment portion 3241 being too small, resulting in insufficient contact area between the second support portion 32 and the pole group 100, making it impossible to provide effective support for the pole group 100. On the other hand, it avoids the width of the abutment portion 3241 being too large, resulting in too little space between the two abutment portions 3241 for setting the guide portion 3242 and the through hole 322, thereby increasing the difficulty for the electrode tab 102 to pass through the through hole 322.

[0068] The ratio of the total width dimension 2×L2 of the abutment portion 3241 to the width dimension B of the support end plate 3 can be any value between 0.18 and 0.4 or any range between two values, such as 0.18, 0.224, 0.268, 0.312, 0.356, 0.4, etc.

[0069] In this embodiment, in order to verify the influence of the various parameter limitations of the support end plate 3 on the battery cover provided in this embodiment, as shown in Table 2, six sets of embodiments and four sets of comparative examples are provided for verification.

[0070] Table 2

[0071]

[0072] A comparison of Examples 7 to 12 with Comparative Examples 5 to 6 reveals that when the width L1 of the through-hole 322 along a third direction is less than the minimum value in the range of 2.8mm ≤ L1 ≤ 7mm, the width of the through-hole 322 is too small, causing the tab 102 to easily rub against the second support 32 when passing through the through-hole 322, resulting in damage to the tab 102. When the width L1 of the through-hole 322 along a third direction is greater than the maximum value in the range of 2.8mm ≤ L1 ≤ 7mm, the width of the through-hole 322 is too large, thereby reducing the structural strength of the second support 32 and making it impossible for the second support 32 to provide effective support for the electrode assembly 100.

[0073] A comparison of Examples 7 to 12 with Comparative Examples 7 to 8 reveals that when the ratio of the total width dimension 2×L2 of the abutment portion 3241 to the width dimension B of the support end plate 3 is less than the minimum value in the range 0.18≤2×L2 / B≤0.4, the total width of the abutment portion 3241 is too small, resulting in insufficient contact area between the second support portion 32 and the pole group 100, making it impossible to provide effective support for the pole group 100, and the stability of the pole group 100 is poor. When the ratio of the total width dimension 2×L2 of the abutment portion 3241 to the width dimension B of the support end plate 3 is greater than the maximum value in the range 0.18≤2×L2 / B≤0.4, the width of the abutment portion 3241 is too large, resulting in too little space between the two abutment portions 3241 for setting the guide portion 3242 and the through hole 322, which in turn increases the difficulty for the tab 102 to pass through the through hole 322, and the tab 102 is easily damaged.

[0074] 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 receiving cavity for accommodating the electrode assembly 100. By using the aforementioned battery cover, the battery not only reduces the external space occupied but also expands the internal space, increasing the volume of the electrode assembly 100 and thereby enhancing its power supply capacity.

[0075] In this embodiment, the battery is a blade battery. Since the blade battery has a structure with tabs 102 on both sides of the electrode group 100, it is provided with two battery covers. Therefore, two types of blade batteries can be derived by combining the battery covers provided in this embodiment. One type is where both battery covers are of the type provided in this embodiment, and the other type is where one of the two battery covers is of the type provided in this embodiment, and the other is still a traditional type of battery cover.

[0076] 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 has an expansion boss 1011 and mounting surfaces 1012 located on both sides of the expansion boss 1011 on either side of the battery cover. The electrode tabs 102 are disposed on the mounting surfaces 1012. The mounting surfaces 1012 abut against the second support portion 32 of the support end plate 3. The expansion boss 1011 is inserted into the expansion cavity 311 in the first support portion 31.

[0077] By providing expansion bosses 1011 on the electrode assembly 100, the volume of the electrode assembly 100 is increased, thereby improving its capacity. When the electrode assembly 100 is installed in the housing, the thrust is applied to the expansion bosses 1011, thus preventing the tabs 102 from being subjected to force. This provides protection for the tabs 102 when the electrode assembly 100 is installed in the housing, preventing the tabs 102 from being easily desoldered or damaged due to thrust during installation.

[0078] 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 body (1) includes a mounting part (11), a connecting part (12) and a protective part (13). The protective part (13) is provided with the mounting part (11) on both sides along the first direction. The connecting part (12) is inclinedly disposed between the protective part (13) and the mounting part (11). The connecting part (12) has a high end and a low end. The high end is connected to the protective part (13) and the low end is connected to the mounting part (11) to form a receiving groove (14) on the side of the cover body (1) facing the pole group (100). The pole module (2) corresponds one-to-one with the mounting part (11). The pole module (2) is insulatedly connected to the corresponding mounting part (11). One side of the pole module (2) is located inside the cover plate body (1) 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 part (11) and is located outside the cover plate body (1). The part of the pole module (2) located outside the cover plate body (1) is lower than the protective part (13).

2. The battery cover according to claim 1, characterized in that, The battery cover also includes a support end plate (3), which is disposed between the cover body (1) and the electrode group (100) and abuts against the electrode group (100). The support end plate (3) includes a first support part (31) and a second support part (32). The first support part (31) is a hollow protrusion structure formed by the surface of the support end plate (3) facing the electrode group (100) and protruding away from the surface of the electrode group (100). It has an expansion cavity (311) inside. The first support part (31) is inserted into the receiving groove (14). The second support part (32) is disposed on both sides of the first support part (31) along the first direction and is located below the mounting part (11).

3. The battery cover according to claim 2, characterized in that, The length dimension of the support end plate (3) along the first direction is A, and the length dimension of the second support part (32) along the first direction is W, and satisfies 0.4≤2×W / A≤0.

6.

4. The battery cover according to claim 2, characterized in that, The distance between the surface of the second support (32) that abuts against the pole group (100) and the surface of the second support (32) that is away from the pole group (100) along the second direction is H1, and the distance between the surface of the first support (31) that abuts against the pole group (100) and the surface of the first support (31) that is away from the pole group (100) along the second direction is H2, and satisfies 8.5mm≤H2-H1≤25mm.

5. The battery cover according to claim 4, characterized in that, The distance H1 between the surface of the second support (32) that abuts against the pole group (100) and the surface of the second support (32) that is away from the pole group (100) along the second direction satisfies 5mm≤H1≤9mm.

6. The battery cover according to claim 2, characterized in that, The second support part (32) has a receiving groove (321) on the side facing the cover plate body (1) and a through elongated hole (322) that connects the second support part (32) to the receiving groove (321).

7. The battery cover according to claim 6, characterized in that, The width dimension of the through hole (322) along the third direction is L1, and satisfies 2.8mm≤L1≤7mm.

8. The battery cover according to claim 7, characterized in that, The second support portion (32) includes a bottom wall (324) facing the electrode assembly (100) and a side wall (325) surrounding the bottom wall (324). The bottom wall (324) includes an abutment portion (3241) and a guide portion (3242). The abutment portion (3241) is connected to the side wall (325), and the guide portion (3242) is connected to the side of the abutment portion (3241) away from the side wall (325). The guide portion (3242) is inclined so that the side of the guide portion (3242) away from the abutment portion (3241) is away from the electrode assembly (100). The through hole (322) is located between the two guide portions (3242).

9. The battery cover according to claim 8, characterized in that, The width dimension of the abutting part (3241) along the third direction is L2, and the width dimension of the second supporting part (32) along the third direction is B, and satisfies 0.18≤2×L2 / B≤0.

4.

10. A battery, characterized in that, The battery includes an electrode assembly (100), a battery housing (200), and a battery cover as described in any one of claims 1-9. The battery housing (200) is a hollow housing structure with at least one opening. The battery cover is disposed at the opening of the battery housing (200) to close the battery housing (200) and form a receiving cavity for accommodating the electrode assembly (100).

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