Battery cover plate 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 post module. The cover body includes a mounting plate and protective plates on both sides thereof, with an internal expansion space. It includes a retaining side plate, a connecting side plate, a connecting side plate, a protective top plate, a mounting bottom plate, and a sealing plate. The terminal post module includes conductive electrode posts and a first connecting top plate and a second connecting top plate connected to them. The mounting plate and the mounting bottom plate are both insulatedly connected to the conductive electrode posts. The first connecting top plate is located on the side of the mounting plate opposite to the electrode group, and the second connecting top plate is located on the side of the mounting bottom plate opposite to the electrode group. The height of both the first and second connecting top plates does not exceed that of the protective top plate. This design avoids the terminal post module protruding from the cover body, reducing the space occupied on the outer side, increasing the assembly rate, and providing protection against damage. Furthermore, the expanded space increases the volume of the electrode group, improving battery capacity. The multi-terminal post structure also disperses the heat-generating area and reduces the temperature of the conductive electrode posts.

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 an installation plate and a protective plate assembly. The protective plate assembly is provided on both sides of the installation plate along a first direction. The protective plate assembly includes two enclosure side plates arranged opposite each other along a second direction, and a connecting side plate, a connecting side plate, a protective top plate, an installation bottom plate, and a sealing plate disposed between the two enclosure side plates. The connecting side plate and the connecting side plate are not parallel to the installation plate. The lower end of the connecting side plate is connected to the installation plate, and the higher end of the connecting side plate is connected to the protective top plate. The higher end of the connecting side plate is connected to the side of the protective top plate opposite to the connecting side plate. The lower end of the connecting side plate is connected to the installation bottom plate. The sealing plate is parallel to the connecting side plate and is connected to the side of the installation bottom plate opposite to the connecting side plate. The connecting side plate, the connecting side plate, the protective top plate, the installation bottom plate, the enclosure side plate, and the sealing plate together enclose an expansion space.

[0009] An electrode module includes conductive electrode posts, a first connecting top plate, and a second connecting top plate. The conductive electrode posts are insulatedly connected to both the mounting plate and the mounting base. The first connecting top plate is located on the side of the mounting plate away from the electrode group and is connected to the conductive electrode posts connected to the mounting plate. The second connecting top plate is located on the side of the mounting base away from the electrode group and is connected to the conductive electrode posts connected to the mounting base. The height of both the first connecting top plate and the second connecting top plate in a third direction does not exceed that of the protective top plate.

[0010] Optionally, the protective top plates located on both sides of the mounting plate have a distance of L1 between the two opposite sides along the first direction, and the length of the cover plate body along the first direction is A, satisfying 0.55≤L1 / A≤0.7.

[0011] Optionally, the distance between the surface of the protective top plate facing away from the electrode group and the surface of the mounting base plate facing away from the electrode group along the third direction is H1, and the distance between the surface of the protective top plate facing away from the electrode group and the surface of the mounting plate facing away from the electrode group along the third direction is H2, and satisfies 3.5mm≤H1-H2≤25mm.

[0012] Optionally, the connecting side plate is perpendicular to the mounting plate, the connecting side plate is inclined, and the included angle between the connecting side plates located on both sides of the mounting plate along the first direction and away from the pole group is N, and satisfies 10°≤N≤40°.

[0013] Optionally, the fence side panel includes a first fence portion, a second fence portion, and a third fence portion. The protective top plate, the connecting side plate, and the connecting side plate are all connected to the first fence portion. The second fence portion is located on the side of the first fence portion away from the protective top plate and is connected to the connecting side plate. The third fence portion is located on the side of the second fence portion away from the first fence portion and is connected to the mounting base plate and the sealing plate, thereby forming a Z-shaped fence side panel.

[0014] The width of the second enclosure portion along the second direction is W, and it satisfies 5mm≤W≤16mm.

[0015] Optionally, the first connecting top plate further includes a first connecting plate body and a second connecting plate body. The first connecting plate body is disposed on the side of the mounting plate body away from the electrode group and is connected to the conductive electrode post connected to the mounting plate body. The second connecting plate body is parallel to the connecting side plate and is connected to both sides of the first connecting plate body along the first direction.

[0016] Optionally, the electrode module further includes a flow guide base plate, which is disposed on the side of the cover plate body facing the electrode assembly and includes a first flow guide plate, a second flow guide plate, a third flow guide plate, a fourth flow guide plate, and a fifth flow guide plate. The first flow guide plate abuts against the mounting plate and is connected to the conductive electrode post connected to the mounting plate. The second flow guide plate is parallel to the connecting side plate and is connected to both sides of the first flow guide plate along the first direction. The third flow guide plate is parallel to the protective top plate and is connected to the side of the second flow guide plate away from the first flow guide plate. The fourth flow guide plate is parallel to the connecting side plate and is connected to the side of the third flow guide plate away from the second flow guide plate. The fifth flow guide plate is parallel to the mounting base plate and is connected to the side of the fourth flow guide plate away from the third flow guide plate. The conductive electrode post connected to the mounting base plate is connected to the fifth flow guide plate.

[0017] Optionally, the thickness of the first guide plate, the second guide plate, the third guide plate, the fourth guide plate, and the fifth guide plate is all T, and satisfies 1.6mm≤T≤3mm.

[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 plane, a second mounting plane, and an expansion boss. The first mounting plane is located below the mounting base plate. The expansion boss is located on both sides of the first mounting plane along the first direction and within the expansion space. The second mounting plane is located on the side of the expansion boss facing away from the first mounting plane. The electrode tabs are provided on the surfaces of the first mounting plane, the second mounting plane, and the expansion boss facing the second mounting plane.

[0020] The beneficial effects of this invention are:

[0021] This invention provides a battery cover plate. The battery cover plate has a protective plate assembly consisting of a retaining side plate, a connecting side plate, a connecting side plate, a protective top plate, a mounting bottom plate, and a sealing plate. The protective top plate is connected to the high ends of the connecting and connecting side plates, while the mounting plate and mounting bottom plate, which are connected to the conductive electrode posts, are respectively connected to the low ends of the connecting and connecting side plates. This ensures that the height of the first and second connecting top plates connected to the conductive electrode posts does not exceed the height of the protective top plate in any third direction. This effectively utilizes the space previously occupied by the protruding electrode post modules, reducing... The design reduces the space occupied by the battery cover, increases the battery module assembly rate, and provides protection for the electrode modules through the protruding protective top plate, preventing damage caused by bumps. On the other hand, the expansion space formed by the enclosure side plate, connecting side plate, connecting side plate, protective top plate, mounting base plate and sealing plate allows the electrode group to utilize the expansion space, improving the space utilization rate between the electrode group and the cover body, increasing the electrode group volume and improving battery capacity. In addition, since conductive electrode posts are connected to the mounting base plate and mounting plate, a multi-electrode post structure is formed, dispersing the heat generation area and reducing the operating temperature of individual conductive electrode posts.

[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 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 partial structural diagram of a battery using the battery cover provided by the present invention;

[0028] Figure 6 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. First mounting plane; 1012. Second mounting plane; 1013. Expansion boss; 102. Electrode tab; 200. Battery casing;

[0031] 1. Cover plate body; 11. Mounting plate body; 111. Receiving groove; 12. Protective plate assembly; 121. Fence side plate; 1211. First enclosure part; 1212. Second enclosure part; 1213. Third enclosure part; 122. Connecting side plate; 123. Connecting side plate; 124. Protective top plate; 125. Mounting bottom plate; 126. Sealing plate;

[0032] 2. Electrode post module; 21. Conductive electrode post; 22. First connecting top plate; 221. First connecting plate body; 222. Second connecting plate body; 23. Second connecting top plate; 24. First outer insulating component; 241. Main body; 242. Extension part; 25. Second outer insulating component; 26. Flow guide bottom plate; 261. First flow guide plate body; 262. Second flow guide plate body; 263. Third flow guide plate body; 264. Fourth flow guide plate body; 265. Fifth flow guide plate body; 27. Inner insulating component; 271. First inner insulating part; 272. Second inner insulating part; 273. Third inner insulating part; 274. Fourth inner insulating part; 275. Fifth inner insulating part. 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 width direction of the battery cover is defined as the second direction, and the thickness direction of the battery cover is defined as the third direction.

[0039] like Figures 1 to 4As shown, the battery cover includes a cover body 1 and a terminal module 2. The cover body 1 includes a mounting plate 11 and a protective plate assembly 12. The mounting plate 11 has protective plate assemblies 12 on both sides along a first direction. The protective plate assembly 12 includes two enclosure side plates 121 arranged opposite each other along a second direction, and a connecting side plate 122, a connecting side plate 123, a protective top plate 124, a mounting bottom plate 125, and a sealing plate 126 disposed between the two enclosure side plates 121. The connecting side plate 122 and the connecting side plate 123 are not parallel to the mounting plate 11. The lower end of the connecting side plate 122 is connected to the mounting plate 11, and the higher end of the connecting side plate 122 is connected to the protective top plate 124. The higher end of the connecting side plate 123 is connected to the side of the protective top plate 124 opposite to the connecting side plate 122, and the lower end of the connecting side plate 123 is connected to the mounting bottom plate 125. The sealing plate 126 is connected to the connecting side plate 123. The side plate 123 is parallel and connected to the mounting base plate 125 on the side away from the connecting side plate 123. The connecting side plate 122, connecting side plate 123, protective top plate 124, mounting base plate 125, enclosure side plate 121 and sealing plate 126 together form the expansion space. The pole module 2 includes conductive pole 21, first connecting top plate 22 and second connecting top plate 23. Conductive pole 21 is insulatedly connected to both the mounting plate 11 and the mounting base plate 125. The first connecting top plate 22 is located on the side of the mounting plate 11 away from the pole group 100 and is connected to the conductive pole 21 connected to the mounting plate 11. The second connecting top plate 23 is located on the side of the mounting base plate 125 away from the pole group 100 and is connected to the conductive pole 21 connected to the mounting base plate 125. The height of the first connecting top plate 22 and the second connecting top plate 23 in the third direction does not exceed the protective top plate 124.

[0040] The battery cover plate has a protective plate assembly 12 consisting of a retaining side plate 121, a connecting side plate 122, a connecting side plate 123, a protective top plate 124, a mounting base plate 125, and a sealing plate 126 on the cover plate body 1. The protective top plate 124 is connected to the high end of the connecting side plate 123 and the connecting side plate 122, and the mounting plate 11 and the mounting base plate 125, which are connected to the conductive electrode post 21, are respectively connected to the low end of the connecting side plate 122 and the connecting side plate 123. This ensures that the height of the first connecting top plate 22 and the second connecting top plate 23 connected to the conductive electrode post 21 in any third direction does not exceed the height of the protective top plate 124. This effectively utilizes the space originally occupied by the electrode post module 2 protruding from the cover plate body 1, reducing the space occupied by the electrode post module 2 protruding from the cover plate body 1. The battery cover plate occupies less space on the outside, increasing the battery module assembly rate. The protruding protective top plate 124 provides protection for the electrode module 2, preventing damage from impacts. On the other hand, the expansion space formed by the enclosure side plate 121, connecting side plate 122, connecting side plate 123, protective top plate 124, mounting base plate 125 and sealing plate 126 allows the electrode group 100 to utilize the expansion space, improving the space utilization between the electrode group 100 and the cover plate body 1, increasing the volume of the electrode group 100 and improving the battery capacity. In addition, since conductive electrode posts 21 are connected to both the mounting base plate 125 and the mounting plate 11, a multi-electrode structure is formed, dispersing the heat generation area and reducing the operating temperature of a single conductive electrode post 21.

[0041] In this embodiment, in order to facilitate the limiting of the first connecting top plate 22 and prevent the first connecting top plate 22 from shifting along the second direction, the mounting plate 11 is also provided with a receiving groove 111, and the first connecting plate 221 is placed in the receiving groove 111.

[0042] Optionally, such as Figure 2 , Figure 4 As shown, the protective top plates 124 located on both sides of the mounting plate 11 have a distance of L1 between the two opposite sides along the first direction, and the length of the cover plate body 1 along the first direction is A, and satisfies 0.55≤L1 / A≤0.7.

[0043] By limiting the ratio of the spacing dimension L1 of the two protective top plates 124 on opposite sides along the first direction to the length dimension A of the cover plate body 1 along the first direction, such that it satisfies 0.55≤L1 / A≤0.7, the following measures are taken: Firstly, the spacing dimension L1 is not too small relative to the length dimension A, which would reduce the size of the protective top plate 124 while keeping the size of the mounting plate 11 unchanged, resulting in insufficient expansion space for increasing the volume of the electrode group 100 and failing to meet the power supply requirements of the battery. Secondly, the spacing dimension L1 is not too large relative to the length dimension A, which would reduce the size of the mounting base plate 125, resulting in insufficient area on the mounting base plate 125 for mounting the second connecting top plate 23, thereby compressing the size of the second connecting top plate 23, reducing the overcurrent area, and failing to meet the overcurrent requirements of the battery for high current.

[0044] The ratio of the distance L1 between the two protective top plates 124 on opposite sides along the first direction to the length A of the cover plate body 1 along the first direction can be any value between 0.55 and 0.7 or any range between two values, such as 0.55, 0.6, 0.65, 0.7, etc.

[0045] Optionally, such as Figure 2 , Figure 4 As shown, the distance between the surface of the protective top plate 124 away from the electrode group 100 and the surface of the mounting base plate 125 away from the electrode group 100 along the third direction is H1, and the distance between the surface of the protective top plate 124 away from the electrode group 100 and the surface of the mounting plate 11 away from the electrode group 100 along the third direction is H2, and the distance satisfies 3.5mm≤H1-H2≤25mm.

[0046] By limiting the difference between the distance H1 between the surface of the protective top plate 124 away from the electrode group 100 and the surface of the mounting base plate 125 away from the electrode group 100 along a third direction and the distance H2 between the surface of the protective top plate 124 away from the electrode group 100 and the surface of the mounting plate 11 away from the electrode group 100 along a third direction, such that 3.5mm≤H1-H2≤25mm is satisfied, on the one hand, the distance between the mounting base plate 125 and the mounting plate 11 is not too small, resulting in insufficient expansion space for increasing the volume of the electrode group 100 and failing to meet the power supply requirements of the battery. On the other hand, the distance between the mounting base plate 125 and the mounting plate 11 is not too large, resulting in an excessively large distance between the conductive electrode post 21 connected to the mounting base plate 125 and the conductive electrode post 21 mounted on the mounting plate 11, which would make it difficult for the tab 102 to connect to both.

[0047] The difference between the distance H1 between the surface of the protective top plate 124 away from the electrode assembly 100 and the surface of the mounting base plate 125 away from the electrode assembly 100 along a third direction and the distance H2 between the surface of the protective top plate 124 away from the electrode assembly 100 and the surface of the mounting plate 11 away from the electrode assembly 100 along a third direction can be any value between 3.5mm and 25mm or any range between two values, such as 3.5mm, 7.8mm, 12.1mm, 16.4mm, 20.7mm, 25mm, etc.

[0048] Optionally, such as Figure 2 , Figure 4 As shown, the connecting side plate 123 is perpendicular to the mounting plate 11, and the connecting side plate 122 is inclined. The angle between the connecting side plates 122 on both sides of the mounting plate 11 along the first direction and away from the pole group 100 is N, and satisfies 10°≤N≤40°.

[0049] By vertically connecting the connecting side plate 123 of the protective plate assembly 12 to the protective top plate 124, the ability of the protective plate assembly 12 to resist vertical loads is improved. On the other hand, the vertical connection structure can minimize the compression of the expansion space and increase the volume of the expansion space. Furthermore, by tilting the connecting side plate 122 of the protective plate assembly 12 between the protective top plate 124 and the mounting plate 11, the vertical load can be effectively decomposed into "axial force along the plate direction" and "force perpendicular to the plate", thereby dispersing the load, protecting the connection, and further improving the structural strength of the protective plate assembly 12. Thus, the cover plate body 1 has both high resistance to vertical loads and high structural strength, while also taking into account the size of the expansion space. In addition, by limiting the included angle N between the two connecting side plates 122 and the electrode assembly 100 to satisfy 10°≤N≤40°, on the one hand, the included angle N is not too small, which would result in poor load distribution between the connecting side plate 122 and the mounting plate 11, making it easy for cracks to occur between the connecting side plate 122 and the mounting plate 11. On the other hand, the included angle N is not too large, which would reduce the height of the protective top plate 124 and compress the size of the expansion space, resulting in insufficient expansion space for increasing the volume of the electrode assembly 100, thus failing to meet the energy supply requirements of the battery.

[0050] The included angle N between the two connecting side plates 122 and the pole group 100 can be any value between 10° and 40° or any range between two values, such as 10°, 15°, 20°, 25°, 30°, 35°, 40°, etc.

[0051] 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.

[0052] Table 1

[0053]

[0054] A comparison of Examples 1 to 6 with Comparative Examples 1 to 2 reveals that when the ratio of the distance L1 between the two protective top plates 124 on opposite sides 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 0.55≤L1 / A≤0.7, the size of the protective top plate 124 is small, resulting in insufficient expansion space for increasing the volume of the electrode assembly 100, which does not meet the energy supply requirements of the battery. When the ratio of the distance L1 between the two protective top plates 124 on opposite sides 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 0.55≤L1 / A≤0.7, the size of the mounting base plate 125 is small, resulting in insufficient area on the mounting base plate 125 for mounting the second connecting top plate 23, thereby compressing the size of the second connecting top plate 23, reducing the overcurrent area, and failing to meet the overcurrent requirements of the battery for high current.

[0055] A comparison of Examples 1 to 6 with Comparative Examples 3 to 4 reveals that when the difference between the distance H1 between the surface of the protective top plate 124 away from the electrode assembly 100 and the surface of the mounting base plate 125 away from the electrode assembly 100 along a third direction and the distance H2 between the surface of the protective top plate 124 away from the electrode assembly 100 and the surface of the mounting plate 11 away from the electrode assembly 100 along a third direction is less than the minimum value within the range of 3.5mm ≤ H1 - H2 ≤ 25mm, the distance between the mounting base plate 125 and the mounting plate 11 is too small, resulting in insufficient expansion space for increasing the volume of the electrode assembly 100, which does not meet the power supply requirements of the battery. When the difference between the distance H1 between the surface of the top plate 124 away from the electrode group 100 and the surface of the mounting base plate 125 away from the electrode group 100 along a third direction and the distance H2 between the surface of the protective top plate 124 away from the electrode group 100 and the surface of the mounting plate 11 away from the electrode group 100 along a third direction is greater than the maximum value of 3.5mm≤H1-H2≤25mm, the distance between the mounting base plate 125 and the mounting plate 11 is too large, resulting in an excessively large distance between the conductive electrode post 21 connected to the mounting base plate 125 and the conductive electrode post 21 installed on the mounting plate 11, making it difficult for the electrode tab 102 to connect to both.

[0056] A comparison of Examples 1 to 6 with Comparative Examples 5 to 6 reveals that when the included angle N between the two connecting side plates 122 and the electrode group 100 is less than the minimum value of the range 10°≤N≤40°, the included angle N is too small, resulting in poor load distribution between the connecting side plates 122 and the mounting plate 11, making it easy for cracks to occur between the connecting side plates 122 and the mounting plate 11. When the included angle N between the two connecting side plates 122 and the electrode group 100 is greater than the maximum value of the range 10°≤N≤40°, the included angle N is too large, resulting in a reduction in the height of the protective top plate 124 and a reduction in the size of the expansion space, making the expansion space for increasing the volume of the electrode group 100 insufficient and failing to meet the energy supply requirements of the battery.

[0057] Optionally, such as Figure 2 , Figure 4 As shown, the fence side panel 121 includes a first fence portion 1211, a second fence portion 1212, and a third fence portion 1213. The protective top plate 124, the connecting side plate 122, and the connecting side plate 123 are all connected to the first fence portion 1211. The second fence portion 1212 is located on the side of the first fence portion 1211 away from the protective top plate 124 and is connected to the connecting side plate 123. The third fence portion 1213 is located on the side of the second fence portion 1212 away from the first fence portion 1211 and is connected to the mounting base plate 125 and the sealing plate 126 to form a Z-shaped fence side panel 121.

[0058] By designing a Z-shaped enclosure side plate 121 consisting of a first enclosure part 1211, a second enclosure part 1212, and a third enclosure part 1213, not only is the area for protecting the electrode group 100 inserted into the expansion space guaranteed, but also the Z-shaped structure formed by it avoids interference between the enclosure side plate 121 and the tooling for fixing the conductive electrode post 21 during assembly, thus ensuring sufficient working space.

[0059] Optionally, such as Figure 2 , Figure 4 As shown, the width dimension of the second enclosure portion 1212 along the second direction is W, and it satisfies 5mm≤W≤16mm. By limiting the width dimension W of the second enclosure portion 1212 along the second direction to satisfy 5mm≤W≤16mm, it avoids two problems: firstly, the width of the second enclosure portion 1212 is too small, resulting in a small protective area and poor protection; secondly, it avoids the width of the second enclosure portion 1212 being too large, resulting in too little space between the enclosure side plate 121 and the conductive electrode post 21, which would cause interference between the enclosure side plate 121 and the tooling fixing the conductive electrode post 21 during the assembly of the battery cover, resulting in damage to the enclosure side plate 121.

[0060] The width W of the second enclosure portion 1212 along the second direction can be any value between 5mm and 16mm or a range between any two values, such as 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, etc.

[0061] Optionally, such as Figure 2 , Figure 4 As shown, the first connecting top plate 22 also includes a first connecting plate body 221 and a second connecting plate body 222. The first connecting plate body 221 is located on the side of the mounting plate body 11 away from the electrode group 100 and is connected to the conductive electrode post 21 connected to the mounting plate body 11. The second connecting plate body 222 is parallel to the connecting side plate 122 and is connected to both sides of the first connecting plate body 221 along the first direction.

[0062] By designing a first connecting top plate 22 consisting of a first connecting plate 221 and a second connecting plate 222, the area where the first connecting top plate 22 will be subsequently welded to the battery is increased, thereby increasing the current-carrying area and meeting the current-carrying requirements of high-current batteries.

[0063] In this embodiment, in order to ensure the insulation of the outer side of the cover plate body 1, the pole module 2 also includes a first outer insulating member 24 and a second outer insulating member 25. The first outer insulating member 24 is disposed between the first connecting top plate 22 and the cover plate body 1. The structure of the first outer insulating member 24 is adapted to the first connecting top plate 22, and includes a main body 241 and an extension part 242. The main body 241 is sandwiched between the mounting plate 11 and the first connecting plate 221, and the extension part 242 is sandwiched between the connecting side plate 122 and the second connecting plate 222. The second outer insulating member 25 is disposed between the mounting bottom plate 125 and the second connecting top plate 23.

[0064] Optionally, such as Figure 3 , Figure 4As shown, the electrode module 2 also includes a flow guide base plate 26, which is located on the side of the cover plate body 1 facing the electrode assembly 100. The flow guide base plate 26 includes a first flow guide plate 261, a second flow guide plate 262, a third flow guide plate 263, a fourth flow guide plate 264, and a fifth flow guide plate 265. The first flow guide plate 261 abuts against the mounting plate 11 and is connected to the conductive electrode post 21 connected to the mounting plate 11. The second flow guide plate 262 is parallel to the connecting side plate 122 and is connected to the first flow guide plate 261 along the first direction. On the side, the third guide plate 263 is parallel to the protective top plate 124 and connected to the side of the second guide plate 262 away from the first guide plate 261. The fourth guide plate 264 is parallel to the connecting side plate 123 and connected to the side of the third guide plate 263 away from the second guide plate 262. The fifth guide plate 265 is parallel to the mounting base plate 125 and connected to the side of the fourth guide plate 264 away from the third guide plate 263. The conductive electrode post 21 connected to the mounting base plate 125 is connected to the fifth guide plate 265.

[0065] By designing a current-guiding base plate 26 consisting of a first current-guiding plate 261, a second current-guiding plate 262, a third current-guiding plate 263, a fourth current-guiding plate 264, and a fifth current-guiding plate 265, the conductive electrode posts 21 mounted on the mounting plate 11 and the conductive electrode posts 21 mounted on the mounting base plate 125 are connected as one unit. On the one hand, it eliminates the need to set up multiple current-guiding base plates 26 separately, reducing the number of parts and improving assembly efficiency. On the other hand, it provides a larger welding area for subsequent welding with the tabs 102 of the electrode assembly 100, increasing the current-passing area and meeting the current-passing requirements of high-current batteries.

[0066] In this embodiment, in order to ensure the insulation of the inner side of the cover plate body 1, an inner insulating component 27 is also included. The inner insulating component 27 includes a first inner insulating part 271, a second inner insulating part 272, a third inner insulating part 273, a fourth inner insulating part 274, and a fifth inner insulating part 275. The first inner insulating part 271 is sandwiched between the first guide plate body 261 and the mounting plate body 11. The second inner insulating part 272 is sandwiched between the second guide plate body 262 and the connecting side plate 122. The third inner insulating part 273 is sandwiched between the third guide plate body 263 and the protective top plate 124. The fourth inner insulating part 274 is sandwiched between the fourth guide plate body 264 and the connecting side plate 123. The fifth inner insulating part 275 is sandwiched between the fifth guide plate body 265 and the mounting bottom plate 125. In order to ensure the sealing of the conductive electrode post 21 and prevent electrolyte leakage, the electrode post module 2 also includes a sealing ring fitted on the conductive electrode post 21.

[0067] Optionally, such as Figure 3 , Figure 4As shown, the thickness of the first guide plate 261, the second guide plate 262, the third guide plate 263, the fourth guide plate 264 and the fifth guide plate 265 is T, and satisfies 1.6mm≤T≤3mm.

[0068] By limiting the thickness T of the first guide plate 261, the second guide plate 262, the third guide plate 263, the fourth guide plate 264, and the fifth guide plate 265 to satisfy 1.6mm≤T≤3mm, it is possible to avoid both excessive thickness, which would result in poor structural strength and easy fracture deformation, and excessive thickness, which would result in high internal resistance and increased energy loss.

[0069] The thickness T of the first guide plate 261, the second guide plate 262, the third guide plate 263, the fourth guide plate 264, and the fifth guide plate 265 can be any value between 1.6mm and 3mm or any range between two values, such as 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, etc.

[0070] 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 four sets of comparative examples are provided for verification.

[0071] Table 2

[0072]

[0073] A comparison of Examples 7 to 12 with Comparative Examples 7 to 8 reveals that when the width W of the second enclosure portion 1212 along the second direction is less than the minimum value of the range 5mm≤W≤16mm, the width of the second enclosure portion 1212 is too small, resulting in a small protective area and poor protection. When the width W of the second enclosure portion 1212 along the second direction is greater than the maximum value of the range 5mm≤W≤16mm, the width of the second enclosure portion 1212 is too large, resulting in too little space between the enclosure side plate 121 and the conductive electrode post 21. This causes interference between the enclosure side plate 121 and the tooling for fixing the conductive electrode post 21 during battery cover assembly, resulting in damage to the enclosure side plate 121.

[0074] A comparison of Examples 7 to 12 with Comparative Examples 9 to 10 reveals that when the thickness T of the first guide plate 261, the second guide plate 262, the third guide plate 263, the fourth guide plate 264, and the fifth guide plate 265 is less than the minimum value in the range of 1.6 mm ≤ T ≤ 3 mm, the thickness of the guide plate 26 is too small, resulting in poor structural strength and easy fracture deformation. When the thickness T of the first guide plate 261, the second guide plate 262, the third guide plate 263, the fourth guide plate 264, and the fifth guide plate 265 is greater than the maximum value in the range of 1.6 mm ≤ T ≤ 3 mm, the thickness of the guide plate 26 is too large, resulting in greater internal resistance and increased energy loss.

[0075] In this embodiment, as Figures 5 to 6 As shown, the battery also includes 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 located 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 thus enhancing its power supply capacity.

[0076] 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.

[0077] Optionally, such as Figure 6 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 plane 1011, a second mounting plane 1012, and an expansion boss 1013. The first mounting plane 1011 is located below the mounting base plate 125. The expansion boss 1013 is located on both sides of the first mounting plane 1011 along a first direction and is located within the expansion space. The second mounting plane 1012 is located on the side of the expansion boss 1013 facing away from the first mounting plane 1011. Electrode tabs 102 are provided on the surfaces of the first mounting plane 1011, the second mounting plane 1012, and the expansion boss 1013 facing the second mounting plane 1012.

[0078] By providing tabs 102 on the surfaces of the first mounting plane 1011, the second mounting plane 1012, and the expansion boss 1013 facing the second mounting plane 1012, the area of ​​the tabs 102 is increased, thereby improving the current carrying capacity. Furthermore, by providing expansion bosses 1013 on both sides of the first mounting plane 1011, the volume of the electrode assembly 100 is increased, thereby improving the capacity. In addition, since the expansion bosses 1013 correspond to the protective top plate 124, when the electrode assembly 100 is inserted into the housing, the thrust is applied to the expansion bosses 1013, thereby preventing the tabs 102 from being subjected to force. This achieves protection for the tabs 102 when the electrode assembly 100 is inserted into the housing, preventing the tabs 102 from being easily desoldered or damaged due to thrust during insertion.

[0079] 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 plate, characterized by The battery cover includes: The cover plate body includes an installation plate and a protective plate assembly. The protective plate assembly is provided on both sides of the installation plate along a first direction. The protective plate assembly includes two enclosure side plates arranged opposite each other along a second direction, and a connecting side plate, a connecting side plate, a protective top plate, an installation bottom plate, and a sealing plate disposed between the two enclosure side plates. The connecting side plate and the connecting side plate are not parallel to the installation plate. The lower end of the connecting side plate is connected to the installation plate, and the higher end of the connecting side plate is connected to the protective top plate. The higher end of the connecting side plate is connected to the side of the protective top plate opposite to the connecting side plate. The lower end of the connecting side plate is connected to the installation bottom plate. The sealing plate is parallel to the connecting side plate and is connected to the side of the installation bottom plate opposite to the connecting side plate. The connecting side plate, the connecting side plate, the protective top plate, the installation bottom plate, the enclosure side plate, and the sealing plate together enclose an expansion space. An electrode module includes conductive electrode posts, a first connecting top plate, and a second connecting top plate. The conductive electrode posts are insulatedly connected to both the mounting plate and the mounting base. The first connecting top plate is located on the side of the mounting plate away from the electrode group and is connected to the conductive electrode posts connected to the mounting plate. The second connecting top plate is located on the side of the mounting base away from the electrode group and is connected to the conductive electrode posts connected to the mounting base. The height of both the first connecting top plate and the second connecting top plate in a third direction does not exceed that of the protective top plate.

2. The battery cover plate of claim 1, wherein, The protective top plates located on both sides of the mounting plate body have a distance of L1 between the two opposite sides along the first direction, and the length of the cover plate body along the first direction is A, and satisfies 0.55≤L1 / A≤0.

7.

3. The battery cover plate of claim 1, wherein, The distance between the surface of the protective top plate facing away from the electrode group and the surface of the mounting base plate facing away from the electrode group along the third direction is H1, and the distance between the surface of the protective top plate facing away from the electrode group and the surface of the mounting plate facing away from the electrode group along the third direction is H2, and satisfies 3.5mm≤H1-H2≤25mm.

4. The battery cover plate of claim 1, wherein, The connecting side plate is perpendicular to the mounting plate, and the connecting side plate is inclined. The angle between the connecting side plates located on both sides of the mounting plate along the first direction and away from the pole group is N, and satisfies 10°≤N≤40°.

5. The battery cover plate of claim 1, wherein, The fence side panel includes a first fence section, a second fence section, and a third fence section. The protective top plate, the connecting side plate, and the connecting side plate are all connected to the first fence section. The second fence section is located on the side of the first fence section away from the protective top plate and is connected to the connecting side plate. The third fence section is located on the side of the second fence section away from the first fence section and is connected to the mounting base plate and the sealing plate, thereby forming a Z-shaped fence side panel. The width of the second enclosure portion along the second direction is W, and it satisfies 5mm≤W≤16mm.

6. The battery cover plate of claim 1, wherein, The first connecting top plate further includes a first connecting plate body and a second connecting plate body. The first connecting plate body is disposed on the side of the mounting plate body away from the electrode group and is connected to the conductive electrode post connected to the mounting plate body. The second connecting plate body is parallel to the connecting side plate and is connected to both sides of the first connecting plate body along the first direction.

7. The battery cover plate of claim 1, wherein, The electrode module further includes a flow guide base plate, which is disposed on the side of the cover plate body facing the electrode assembly and includes a first flow guide plate, a second flow guide plate, a third flow guide plate, a fourth flow guide plate, and a fifth flow guide plate. The first flow guide plate abuts against the mounting plate and is connected to the conductive electrode post connected to the mounting plate. The second flow guide plate is parallel to the connecting side plate and is connected to both sides of the first flow guide plate along the first direction. The third flow guide plate is parallel to the protective top plate and is connected to the side of the second flow guide plate opposite to the first flow guide plate. The fourth flow guide plate is parallel to the connecting side plate and is connected to the side of the third flow guide plate opposite to the second flow guide plate. The fifth flow guide plate is parallel to the mounting base plate and is connected to the side of the fourth flow guide plate opposite to the third flow guide plate. The conductive electrode post connected to the mounting base plate is connected to the fifth flow guide plate.

8. The battery cover plate of claim 7, wherein, The thickness of the first guide plate, the second guide plate, the third guide plate, the fourth guide plate, and the fifth guide plate is all T, and satisfies 1.6mm≤T≤3mm.

9. A battery characterized by 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 of claim 9, wherein, The electrode assembly includes an electrode assembly body and electrode tabs. The electrode assembly body includes a first mounting plane, a second mounting plane, and an expansion boss. The first mounting plane is located below the mounting base plate. The expansion boss is located on both sides of the first mounting plane along the first direction and within the expansion space. The second mounting plane is located on the side of the expansion boss facing away from the first mounting plane. The electrode tabs are provided on the surfaces of the first mounting plane, the second mounting plane, and the expansion boss facing the second mounting plane.

Images