Battery cover plate and battery

Abstract

The application belongs to the technical field of batteries, and discloses a battery cover plate and a battery. The battery cover plate comprises a cover plate body and a pole module. The cover plate body comprises a mounting plate body, an extension plate body and a protection plate body. The two sides of the mounting plate body are provided with inclined extension plate bodies. The low end of the extension plate body is connected with the mounting plate body, and the high end is connected with the protection plate body which is parallel to the mounting plate body. The junction and the middle part of the mounting plate body and the extension plate body are provided with protection bosses. The installation part is formed between the adjacent protection bosses. The protection boss is a hollow boss structure. The pole module is insulatedly connected in the installation part and on the extension plate body. The part of the pole module which is located outside the cover plate body is lower than the protection plate body. By making the part outside the pole module lower than the protection plate body, the space outside is reduced to improve the battery module assembly rate, and the damage caused by knocking is avoided. The space inside the protection boss and below the extension plate body is utilized to increase the volume of the pole group to improve the battery capacity. The multi-pole structure effectively improves the overcurrent capacity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery cover plate and a battery. BACKGROUND

[0002] As an important component of lithium batteries, the structural design of the battery cover plate not only affects the basic performance (such as capacity, charging and discharging efficiency) of the battery, but also directly relates to the safety and long-term reliability of the battery. The main structure of the battery cover plate includes a conductive pole, an aluminum plate, a riveting block, an outer insulating piece, an inner insulating piece, a sealing piece, and a pressure relief valve.

[0003] At present, the aluminum plate of the traditional battery cover plate is usually a flat plate structure. The conductive pole passes through one end of the aluminum plate and is connected with the aluminum plate through the riveting block, and an outer insulating piece is arranged between the riveting block and the aluminum plate for insulation protection; the other end is located on the other side of the aluminum plate and is welded with the tab of the pole group, and the insulation protection of the conductive pole and the aluminum plate is realized through the inner insulating piece.

[0004] This structure causes the traditional battery cover plate to have two problems after assembly: on the one hand, the riveting block and the outer insulating piece on the outer side of the aluminum plate protrude from the plate surface due to the stacked installation, which occupies additional external space and affects the assembly rate of the battery module; on the other hand, the conductive pole and the inner insulating piece on the other side of the aluminum plate also protrude from the plate surface, which occupies the internal space, resulting in low space utilization rate between the pole group and the aluminum plate, limiting the volume of the pole group, and thus reducing the battery capacity. SUMMARY

[0005] The purpose of the present application is to provide a battery cover plate and a battery which not only saves the assembly space of the battery module, improves the assembly rate of the battery module, but also improves the utilization rate of the internal space, increases the volume of the pole group, and improves the battery capacity.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] On the one hand, a battery cover plate is provided, which comprises:

[0008] The cover plate body comprises a mounting plate body, an extension plate body and a protection plate body. The extension plate body is arranged on both sides of the mounting plate body along a first direction and is inclined. The extension plate body has a low position close to the mounting plate body and a high position away from the mounting plate body. One end of the extension plate body at the low position is connected to the mounting plate body. The protection plate body is parallel to the mounting plate body and is connected to one end of the extension plate body at the high position. Two mounting portions are arranged on the mounting plate body along the first direction. Protection bosses are arranged between the two mounting portions and between the mounting portions and the extension plate body. The protection bosses are hollow convex structures formed by recessing the mounting plate body from the inner side of the pole group to the outer side away from the pole group.

[0009] The pole column module is connected to each of the mounting portions and the extension plate body. One side of the pole column module is located on the inner side of the cover plate body and is connected to the lug on the pole group. The other side of the pole column module passes through the cover plate body and is located on the outer side of the cover plate body. The part of the pole column module connected to the mounting portion on the outer side of the cover plate body is lower than the protection boss. The part of the pole column module connected to the extension plate body on the outer side of the cover plate body is lower than the protection plate body.

[0010] Optionally, the distance between the protection plate body and the pole column module connected to the extension plate body along the parallel direction of the extension plate body is W1, and 13mm≤W1≤25mm is satisfied.

[0011] Optionally, the distance between the mounting plate body and the pole column module connected to the extension plate body along the parallel direction of the extension plate body is W2, and 3mm≤W2≤8mm is satisfied.

[0012] Optionally, the length of the cover plate body along the first direction is A, the distance between the protection bosses on both sides of the mounting plate body along the first direction is B, and 0.4≤B / A≤0.6 is satisfied.

[0013] Optionally, the included angle between the two extension plate bodies away from the pole group is N, and 80°≤N≤110° is satisfied.

[0014] Optionally, the protection boss comprises a protection top plate and a protection side plate surrounding the protection top plate. The thickness of the protection side plate is T, and 0.8mm≤T≤1.5mm is satisfied.

[0015] Optionally, the distance between the surface of the protective plate away from the electrode group and the surface of the mounting part facing the electrode group along the second direction is H1, and the distance between the surface of the protective boss away from the electrode group and the surface of the mounting part facing the electrode group along the second direction is H2, and satisfies 6.5mm≤H1-H2≤20mm.

[0016] Optionally, the mounting part is provided with enclosure side plates on both sides along the third direction.

[0017] 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.

[0018] Optionally, the electrode assembly includes an electrode assembly body and electrode tabs corresponding to the electrode post modules. The electrode assembly body has a mounting plane parallel to the mounting plate and a mounting ramp parallel to the expansion plate on the side facing the battery cover. The mounting plane also has expansion bosses corresponding to the protective bosses. The electrode tabs are provided on both the mounting plane and the mounting ramp. The electrode tabs provided on the mounting plane are located between two adjacent expansion bosses.

[0019] The beneficial effects of this invention are:

[0020] This invention provides a battery cover plate. The cover plate body is designed to consist of a mounting plate, an extension plate, and a protective plate. The higher end of the inclined extension plate is connected to the protective plate, and the lower end is connected to the mounting plate. This ensures that the portion of the terminal module extending beyond the cover plate body is lower than the protective plate. This effectively utilizes the space previously occupied by the terminal module protruding from the cover plate body, reducing the space occupied on the outer side of the battery cover plate and increasing the battery module assembly rate. Furthermore, the protruding protective boss provides protection for the terminal module within the mounting section. The protective plate provides protection for the terminal modules on the expansion plate, preventing damage from impacts. On the other hand, since the protective boss is a hollow protruding structure and the expansion plate is tilted away from the terminal group, the terminal group can utilize the space inside the protective boss and the space under the expansion plate to improve the space utilization between the terminal group and the cover plate body, thereby increasing the size of the terminal group and improving the battery capacity. In addition, by insulating the terminal modules between the protective bosses and on the expansion plate, a multi-terminal structure is formed, increasing the current flow area and improving the 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 a structural assembly diagram of the battery cover plate provided by the present invention;

[0023] Figure 2 This is an exploded view of the battery cover plate provided by the present invention from a first perspective.

[0024] Figure 3 This is an exploded view of the battery cover plate provided by the present invention from a second perspective.

[0025] Figure 4 This is a structural cross-sectional view of the battery cover plate provided by the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the cover body in the battery cover provided by the present invention;

[0027] Figure 6 This is a partial structural diagram of a battery using the battery cover provided by the present invention;

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

[0029] In the picture:

[0030] 100. Electrode assembly; 101. Electrode assembly body; 1011. Mounting plane; 1012. Mounting bevel; 1013. Capacity expansion boss; 102. Electrode tab; 200. Battery casing;

[0031] 1. Cover plate body; 11. Mounting plate body; 111. Mounting part; 112. Protective boss; 1121. Protective top plate; 1122. Protective side plate; 113. Enclosure side plate; 12. Extending plate body; 13. Protective plate body;

[0032] 2. Electrode post module; 21. Conductive electrode post; 22. Outer insulating component; 23. Inner insulating component; 24. Riveting block; 25. Sealing ring. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] like Figures 1 to 5As shown, the battery cover includes a cover body 1 and a terminal module 2. The cover body 1 includes a mounting plate 11, an extension plate 12, and a protective plate 13. The mounting plate 11 has inclined extension plates 12 on both sides along a first direction. Each extension plate 12 has a low position close to the mounting plate 11 and a high position away from the mounting plate 11. The end of the extension plate 12 at the low position is connected to the mounting plate 11. The protective plate 13 is parallel to the mounting plate 11 and connected to the end of the extension plate 12 at the high position. The mounting plate 11 has two mounting portions 111 spaced apart along the first direction. There are also connections between the two mounting portions 111 and between the mounting portions 111 and the extension plate 12. A protective boss 112 is provided. The protective boss 112 is a hollow protrusion structure formed by the recess of the mounting plate 11 from the inner side facing the electrode group 100 to the outer side away from the electrode group 100. The pole module 2 is insulatedly connected to each mounting part 111 and the expansion plate 12. One side of the pole module 2 is located inside the cover plate body 1 and is connected to the pole lug 102 on the electrode group 100. The other side of the pole module 2 passes through the cover plate body 1 and is located outside the cover plate body 1. The part of the pole module 2 connected to the mounting part 111 that is located outside the cover plate body 1 is lower than the protective boss 112. The part of the pole module 2 connected to the expansion plate 12 that is located outside the cover plate body 1 is lower than the protective plate 13.

[0040] The battery cover is designed with a cover body 1 consisting of a mounting plate 11, an extension plate 12, and a protective plate 13. The higher end of the inclined extension plate 12 connects to the protective plate 13, and the lower end connects to the mounting plate 11. This ensures that the portion of the terminal module 2 extending beyond the cover body 1 is lower than the protective plate 13. This effectively utilizes the space previously occupied by the terminal module 2 protruding from the cover body 1, reducing the space occupied on the outside of the battery cover and increasing the battery module assembly rate. Furthermore, the protruding protective boss 112 provides protection for the terminal module 2 within the mounting section 111. The protective plate 13 serves as the extension plate 12. The terminal module 2 on the upper part provides protection to avoid damage caused by bumps. On the other hand, since the protective boss 112 is a hollow protruding structure and the extension plate 12 is tilted away from the terminal group 100, the terminal group 100 can improve the space utilization between the terminal group 100 and the cover plate body 1 by utilizing the space inside the protective boss 112 and the space below the extension plate 12, thereby increasing the volume of the terminal group 100 and improving the battery capacity. In addition, by insulatingly connecting the terminal module 2 on the mounting part 111 between the protective bosses 112 and on the extension plate 12, a multi-terminal structure is formed, thereby increasing the current flow area and improving the current flow capacity.

[0041] In this embodiment, since the mounting plate 11 is provided with three protective protrusions 112, two mounting portions 111 are formed on the mounting plate 11. The battery cover is provided with a total of four terminal modules 2, two of which are connected in the two mounting portions 111, and the other two terminal modules 2 are respectively connected to the corresponding extension plate 12. Each 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 cover plate body 1 and is riveted to the riveting block 24. The outer insulating component 22 is located between the riveting block 24 and the cover plate body 1, and the inner insulating component 23 is located between the plate part and the cover plate body 1. 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 outside 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 cover plate body 1 does not exceed the cover plate body 1, 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, in this embodiment, both the protective plate 13 and the protective boss 112 are hollow protrusion structures, which are used to reduce the weight of the cover plate body 1.

[0042] Optionally, such as Figure 4 , Figure 5 As shown, the distance between the protective plate 13 and the pole module 2 connected to the expansion plate 12 along the direction parallel to the expansion plate 12 is W1, and satisfies 13mm≤W1≤25mm.

[0043] By limiting the distance W1 between the protective plate 13 and the pole module 2 connected to the expansion plate 12 in the direction parallel to the expansion plate 12, so that it satisfies 13mm≤W1≤25mm, on the one hand, the pole module 2 is prevented from being too close to the protective plate 13, thus making it easy to be damaged by bumps; on the other hand, the pole module 2 is prevented from being too far away from the protective plate 13, thus being too close to the mounting plate 11, resulting in too small a distance between the pole module 2 and the mounting plate 11, which would make the operating space insufficient and the riveting operation difficult.

[0044] The spacing W1 between the protective plate 13 and the pole module 2 connected to the expansion plate 12 along the direction parallel to the expansion plate 12 can be any value between 13mm and 25mm or any range between two values, such as 13mm, 15mm, 17mm, 19mm, 21mm, 23mm, 25mm, etc.

[0045] Optionally, such as Figure 4 , Figure 5As shown, the distance between the mounting plate 11 and the pole module 2 connected to the expansion plate 12 along the direction parallel to the expansion plate 12 is W2, and satisfies 3mm≤W2≤8mm.

[0046] By limiting the distance W2 between the mounting plate 11 and the pole module 2 connected to the expansion plate 12 in the direction parallel to the expansion plate 12, ensuring that it meets the condition 3mm≤W2≤8mm, the following measures are taken: Firstly, the distance between the pole module 2 and the mounting plate 11 is not too small, which would result in insufficient operating space and difficulty in riveting the pole module 2 during the riveting operation. Secondly, the distance between the pole module 2 and the mounting plate 11 is not too large, which would cause the pole module 2 to be too close to the protective plate 13, making it easy to be damaged by impact.

[0047] The spacing W2 between the mounting plate 11 and the pole module 2 connected to the expansion plate 12 along the direction parallel to the expansion plate 12 can be any value between 3mm and 8mm or any range between two values, such as 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, etc.

[0048] Optionally, such as Figure 4 , Figure 5 As shown, the length dimension of the cover plate body 1 along the first direction is A, and the spacing dimension of the protective protrusions 112 located on both sides of the mounting plate body 11 along the first direction is B, and satisfies 0.4≤B / A≤0.6.

[0049] Since the mounting plate 11 has three protective protrusions 112 and a mounting portion 111 for accommodating the pole module 2, the ratio between the spacing B of the protective protrusions 112 on both sides of the mounting plate 11 along the first direction and the length A of the cover plate body 1 along the first direction is limited to satisfy 0.4≤B / A≤0.6. This avoids the mounting plate 11 being too small relative to the cover plate body 1, ensuring that the mounting plate 11 has sufficient length so that the protective protrusions 112 and the mounting portion 111 can be evenly arranged, and ensuring that the size of the mounting portion 111 is adapted to the pole module 2. The width is designed to prevent the protective protrusions 112 from being too dense due to the mounting plate 11 being too short, resulting in a narrow space in the mounting part 111 and squeezing the installation space of the pole module 2, thereby reducing the current carrying capacity of the pole module 2 on the mounting plate 11. On the other hand, it avoids the mounting plate 11 being too large relative to the cover plate body 1, thus reserving sufficient length for the inclined expansion plates 12 on both sides, ensuring that the expansion plates 12 have a reasonable projected length along the first direction, which can stably support the pole module 2, and avoid insufficient installation space for the pole module 2 due to the expansion plates 12 being too short, thereby reducing the current carrying capacity of the pole module 2 on the expansion plates 12.

[0050] The ratio between the spacing B of the protective protrusions 112 on both sides of the mounting plate 11 along the first direction and the length A of the cover plate body 1 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.

[0051] In this embodiment, to verify the impact of the above parameter limitations on the battery cover provided in this embodiment, as shown in Table 1, six sets of embodiments and six sets of comparative examples are provided for verification.

[0052] Table 1

[0053]

[0054] A comparison of Examples 1 to 6 with Comparative Examples 1 to 2 reveals that when the distance W1 between the protective plate 13 and the pole module 2 connected to the expansion plate 12 in the direction parallel to the expansion plate 12 is less than the minimum value of 13mm≤W1≤25mm, the pole module 2 is too close to the protective plate 13, making it prone to damage from impacts. When the distance W1 between the protective plate 13 and the pole module 2 connected to the expansion plate 12 in the direction parallel to the expansion plate 12 is greater than the maximum value of 13mm≤W1≤25mm, the pole module 2 is too far from the protective plate 13, thus being too close to the mounting plate 11, resulting in a small distance between them. This leads to insufficient operating space for the pole module 2 during riveting operations, making the riveting operation difficult. A comparison of Examples 1 to 6 with Comparative Examples 3 to 4 reveals that when the distance W2 between the mounting plate 11 and the pole module 2 connected to the expansion plate 12 in the direction parallel to the expansion plate 12 is less than the minimum value of 3mm ≤ W2 ≤ 8mm, the distance between the pole module 2 and the mounting plate 11 is too small, resulting in insufficient operating space and difficulty in riveting operations. Conversely, when the distance W2 between the mounting plate 11 and the pole module 2 connected to the expansion plate 12 in the direction parallel to the expansion plate 12 is greater than the maximum value of 3mm ≤ W2 ≤ 8mm, the distance between the pole module 2 and the mounting plate 11 is too large, causing the pole module 2 to be too close to the protective plate 13, making it prone to damage from impacts. A comparison of Examples 1 to 6 with Comparative Examples 5 to 6 reveals that when the ratio of the spacing B of the protective protrusions 112 on both sides of the mounting plate 11 along the first direction to the length A of the cover plate body 1 along the first direction is less than the minimum value in the range 0.4 ≤ B / A ≤ 0.6, the mounting plate 11 is too short, resulting in overly dense protective protrusions 112 and a narrow space in the mounting portion 111, which compresses the mounting space of the pole module 2, thereby reducing the current carrying capacity of the pole module 2 on the mounting plate 11. Conversely, when the ratio of the spacing B of the protective protrusions 112 on both sides of the mounting plate 11 along the first direction to the length A of the cover plate body 1 along the first direction is greater than the maximum value in the range 0.4 ≤ B / A ≤ 0.6, the expansion plate 12 is too short, resulting in insufficient mounting space for the pole module 2, thus reducing the current carrying capacity of the pole module 2 on the expansion plate 12. Optionally, as... Figure 4 , Figure 5As shown, the included angle between the two expansion plates 12 and the electrode group 100 is N, and satisfies 80°≤N≤110°. By limiting the included angle N between the two expansion plates 12 and the electrode group 100 to satisfy 80°≤N≤110°, on the one hand, it avoids the included angle N between the two expansion plates 12 being too small, resulting in the electrode post module 2 connected to the expansion plate 12 being too far from the electrode group 100, thus increasing the difficulty of connecting the electrode tab 102 of the electrode group 100 to the electrode post module 2 connected to the expansion plate 12. On the other hand, it avoids the included angle N between the two expansion plates 12 being too large, resulting in the expansion plate 12 being too close to the electrode group 100, thus reducing the space below the expansion plate 12 for the expansion of the electrode group 100. The included angle N between the two extension plates 12 and the pole group 100 can be any value between 80° and 110°, or a range between any two values, such as 80°, 85°, 90°, 95°, 100°, 105°, 110°, etc. Optionally, as... Figure 4 , Figure 5 As shown, the protective boss 112 includes a protective top plate 1121 and a protective side plate 1122 surrounding the protective top plate 1121. The thickness of the protective side plate 1122 is T, and it satisfies 0.8mm≤T≤1.5mm.

[0055] Since the protective boss 112 is formed by stamping and stretching, the protective side plate 1122 surrounding the protective top plate 1121 on the protective boss 112 will become thinner due to stretching during forming. Therefore, by limiting the thickness T of the protective side plate 1122, it is possible to avoid the protective side plate 1122 being too thin, resulting in weak structural strength and easy deformation due to external impact, which would damage the electrode assembly 100 and result in poor protection. On the other hand, it is also possible to avoid the protective side plate 1122 being too thick, which would increase the difficulty of forming.

[0056] The thickness T of the protective side plate 1122 can be any value or range between 0.8mm and 1.5mm, such as 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc. In this embodiment, the protective boss 112 has certain structural differences due to its different positions. The protective boss 112 located between the two mounting parts 111 has a regular trapezoidal structure, and the protective side plates 1122 have the same structure and are symmetrically distributed around the protective top plate 1121. However, the protective boss 112 located between the mounting part 111 and the extension plate 12 has an asymmetrical structure. The protective side plate 1122 closer to the extension plate 12 has a larger inclination angle than the protective side plate 1122 closer to the mounting part 111, thereby facilitating the connection between the protective boss 112 and the extension plate 12. Optionally, as... Figure 4, Figure 5 As shown, the distance between the surface of the protective plate 13 away from the electrode group 100 and the surface of the mounting part 111 facing the electrode group 100 along the second direction is H1, and the distance between the surface of the protective boss 112 away from the electrode group 100 and the surface of the mounting part 111 facing the electrode group 100 along the second direction is H2, and the distance satisfies 6.5mm≤H1-H2≤20mm. By limiting the difference between the distance H1 along the second direction between the surface of the protective plate 13 facing away from the electrode group 100 and the surface of the mounting part 111 facing the electrode group 100, and the distance H2 along the second direction between the surface of the protective boss 112 facing away from the electrode group 100 and the surface of the mounting part 111 facing the electrode group 100, such that 6.5mm≤H1-H2≤20mm is satisfied, on the one hand, it avoids that the difference is too small, which would cause the hollow structure of the protective boss 112 and the extra space caused by the tilt of the expansion plate 12 to be compressed, thereby limiting the increase in the volume of the electrode group 100 and the limited increase in battery capacity. On the other hand, it avoids that the difference is too large, which would cause the distance between the electrode post module 2 connected to the expansion plate 12 and the electrode tab 102 of the electrode group 100 to be too far, increasing the difficulty of connecting the electrode tab 102 and the electrode post module 2 connected to the expansion plate 12. The difference between the distance H1 along the second direction between the surface of the protective plate 13 facing away from the electrode assembly 100 and the surface of the mounting portion 111 facing the electrode assembly 100, and the distance H2 along the second direction between the surface of the protective boss 112 facing away from the electrode assembly 100 and the surface of the mounting portion 111 facing the electrode assembly 100, can be any value between 6.5mm and 20mm, or any range between any two values, such as 6.5mm, 9.2mm, 11.9mm, 14.6mm, 17.3mm, 20mm, etc. In this embodiment, 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.

[0057] Table 2

[0058]

[0059] A comparison of Examples 7 to 12 with Comparative Examples 7 to 8 reveals that when the included angle N between the two expansion plates 12 and the electrode group 100 is less than the minimum value of the range 80°≤N≤110°, the included angle N between the two expansion plates 12 is too small, resulting in the electrode post module 2 connected to the expansion plate 12 being too far from the electrode group 100. This increases the difficulty of connecting the electrode tab 102 of the electrode group 100 to the electrode post module 2 connected to the expansion plate 12. When the included angle N between the two expansion plates 12 and the electrode group 100 is greater than the maximum value of the range 80°≤N≤110°, the included angle N between the two expansion plates 12 is too large, resulting in the expansion plates 12 being too close to the electrode group 100. This reduces the space below the expansion plates 12 used for expanding the electrode group 100.

[0060] A comparison of Examples 7 to 12 with Comparative Examples 9 to 10 shows that when the thickness T of the protective side plate 1122 is less than the minimum value in the range of 0.8mm ≤ T ≤ 1.5mm, the thickness of the protective side plate 1122 is too small, resulting in weak structural strength and easy deformation due to external impact, which leads to damage to the electrode assembly 100 and poor protection. When the thickness T of the protective side plate 1122 is greater than the maximum value in the range of 0.8mm ≤ T ≤ 1.5mm, the thickness of the protective side plate 1122 is too large, making it difficult to form.

[0061] A comparison of Examples 7 to 12 with Comparative Examples 11 to 12 shows that when the difference between the distance H1 along the second direction between the surface of the protective plate 13 facing away from the electrode assembly 100 and the surface of the mounting portion 111 facing the electrode assembly 100, and the distance H2 along the second direction between the surface of the protective boss 112 facing away from the electrode assembly 100 and the surface of the mounting portion 111 facing the electrode assembly 100, is less than the minimum value in the range of 6.5mm ≤ H1 - H2 ≤ 20mm, the hollow structure of the protective boss 112 and the extra space caused by the tilt of the extension plate 12 are compressed, thereby limiting the volume of the electrode assembly 100. The increase in battery capacity is limited. When the difference between the distance H1 along the second direction between the surface of the protective plate 13 away from the electrode group 100 and the surface of the mounting part 111 facing the electrode group 100 and the distance H2 along the second direction between the surface of the protective boss 112 away from the electrode group 100 and the surface of the mounting part 111 facing the electrode group 100 is greater than the maximum value of 6.5mm≤H1-H2≤20mm, the distance between the pole post module 2 connected to the extension plate 12 and the pole tab 102 of the electrode group 100 is too far, and the connection between the pole tab 102 and the pole post module 2 connected to the extension plate 12 is difficult.

[0062] Optionally, such as Figure 4As shown, the mounting part 111 is provided with enclosure side plates 113 on both sides along the third direction. By providing enclosure side plates 113 on both sides of the mounting part 111 along the third direction, the pole module 2 inside the mounting part 111 is protected on all four sides by the protective plate body 13 and the protective boss 112, thereby reducing the probability of the pole module 2 being damaged by bumps.

[0063] In this embodiment, as Figure 5 , Figure 5 As shown, a battery is also provided, comprising an electrode assembly 100, a battery casing 200, and the aforementioned battery cover. The battery casing 200 is a hollow casing structure with at least one opening. The battery cover is disposed at the opening of the battery casing 200, closing the battery casing 200 to form a cavity for accommodating the electrode assembly 100. By using the aforementioned battery cover, this battery not only reduces the external space occupied but also expands the internal space, increasing the volume of the electrode assembly 100 and thereby enhancing its power supply capacity.

[0064] 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.

[0065] Optionally, such as Figure 6 Figure 7 Figure 7 As shown, the electrode assembly 100 includes an electrode assembly body 101 and electrode tabs 102 corresponding to the electrode post modules 2. The electrode assembly body 101 has an installation plane 1011 parallel to the mounting plate 11 and an installation ramp 1012 parallel to the expansion plate 12 on the side facing the battery cover. The installation plane 1011 also has expansion bosses 1013 corresponding to the protective bosses 112. Both the installation plane 1011 and the installation ramp 1012 have electrode tabs 102. The electrode tabs 102 on the installation plane 1011 are located between two adjacent expansion bosses 1013.

[0066] By providing expansion bosses 1013 on the electrode assembly body 101 that correspond one-to-one with the protective bosses 112, the volume of the electrode assembly 100 is increased, thereby improving its capacity. On the other hand, when the electrode assembly 100 is installed in the housing, the thrust is applied to the expansion bosses 1013, thus avoiding stress on the tabs 102. This achieves 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. Furthermore, tabs 102 are provided on both the mounting plane 1011 and the mounting slope 1012, forming a multi-tab structure and increasing the current carrying capacity of the electrode assembly 100.

[0067] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery cover, characterized in that, The battery cover includes: The cover plate body includes a mounting plate, an extension plate, and a protective plate. The mounting plate has inclined extension plates on both sides along a first direction. The extension plates have a low position close to the mounting plate and a high position away from the mounting plate. The end of the extension plate at the low position is connected to the mounting plate. The protective plate is parallel to the mounting plate and connected to the end of the extension plate at the high position. The mounting plate has two mounting parts spaced apart along the first direction. Protective protrusions are provided between the two mounting parts and between the mounting parts and the extension plate. The protective protrusions are hollow protrusions formed by the mounting plate recessing from the inside towards the electrode group to the outside away from the electrode group. The pole module is insulatedly connected to each of the mounting portions and the expansion plate. One side of the pole module is located inside the cover plate body and connected to the electrode lug on the pole assembly. The other side of the pole module passes through the cover plate body and is located outside the cover plate body. The portion of the pole module connected to the mounting portion that is located outside the cover plate body is lower than the protective boss. The portion of the pole module connected to the expansion plate body that is located outside the cover plate body is lower than the protective plate body.

2. The battery cover according to claim 1, characterized in that, The distance between the protective plate and the pole module connected to the expansion plate in the direction parallel to the expansion plate is W1, and satisfies 13mm≤W1≤25mm.

3. The battery cover according to claim 1, characterized in that, The distance between the mounting plate and the pole module connected to the expansion plate in the direction parallel to the expansion plate is W2, and satisfies 3mm≤W2≤8mm.

4. The battery cover according to claim 1, characterized in that, The length of the cover plate body along the first direction is A, and the spacing between the protective protrusions on both sides of the mounting plate body along the first direction is B, satisfying 0.4≤B / A≤0.

6.

5. The battery cover according to claim 1, characterized in that, The angle between the two expansion plates and the pole group is N, and satisfies 80°≤N≤110°.

6. The battery cover according to claim 1, characterized in that, The protective boss includes a protective top plate and a protective side plate surrounding the protective top plate. The thickness of the protective side plate is T, and it satisfies 0.8mm≤T≤1.5mm.

7. The battery cover according to claim 1, characterized in that, The distance between the surface of the protective plate away from the electrode group and the surface of the mounting part facing the electrode group along the second direction is H1, and the distance between the surface of the protective boss away from the electrode group and the surface of the mounting part facing the electrode group along the second direction is H2, and both satisfy 6.5mm≤H1-H2≤20mm.

8. The battery cover according to claim 1, characterized in that, The installation part is equipped with enclosure side panels on both sides along the third direction.

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

10. The battery according to claim 9, characterized in that, The electrode assembly includes an electrode assembly body and electrode tabs corresponding to the electrode post modules. The electrode assembly body has a mounting plane parallel to the mounting plate and a mounting ramp parallel to the expansion plate on the side facing the battery cover. The mounting plane also has expansion bosses corresponding to the protective bosses. The electrode tabs are provided on both the mounting plane and the mounting ramp. The electrode tabs provided on the mounting plane are located between two adjacent expansion bosses.

Images