Cover plate assembly and battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a cover plate assembly and a battery cell, and the cover plate assembly comprises a cover plate, a pole and a first insulating part; wherein the pole is mounted in a mounting through hole of the cover plate, a part of structure of the pole extends to the inner side of the cover plate, and a first insulating part is arranged between the pole and the inner side of the cover plate; a positioning protruding part is formed on the inner side of the cover plate, and the first insulating part is formed on the inner side of the cover plate in an injection molding mode and wraps the positioning protruding part. According to the cover plate assembly provided by the invention, the first insulating part and the cover plate are integrally injection-molded and combined, and the cover plate is provided with the positioning lug boss, so that the strength of integral injection-molded and combined of the lower plastic and the cover plate is increased, the problems of gaps, unevenness or displacement and the like occurring when the first insulating part and the cover plate are assembled are avoided, and the size precision is better; the safety performance of the cover plate assembly is improved, it is guaranteed that the cover plate assembly and the shell are smoothly assembled, and the production efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cover plate assembly and a battery cell. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in the fields of energy storage and electric vehicles, and the requirements for the performance and safety of lithium-ion batteries are increasing. At present, the blade cells in lithium-ion batteries include a shell, an electrode group, and a cover plate structure. The electrode group is installed in the shell and is sealed by the cover plate structure. The cover plate structure often includes a bare aluminum plate, a lower plastic, a pole, and a sealing ring. When the lower plastic and the bare aluminum plate are assembled, gaps, unevenness, and offsets may occur, which may lead to deviations in the assembly of the pole, sealing ring, etc., which in turn affects the sealing effect and poses a risk of leakage. Utility Model Content

[0003] The purpose of the present application is to provide a cover plate assembly and a battery cell, which to a certain extent solves the technical problems existing in the prior art that gaps, unevenness and offsets may occur when assembling the lower plastic and the bare aluminum plate, which in turn leads to deviations in the assembly of poles, sealing rings, etc., thereby affecting the sealing effect and posing a risk of leakage.

[0004] The present application provides a cover plate assembly, comprising: a cover plate, a pole and a first insulating member; wherein the pole is installed in a mounting through hole of the cover plate, and a portion of the structure of the pole extends to the inner side of the cover plate, and the first insulating member is arranged between the inner side of the cover plate; a positioning protrusion is formed on the inner side of the cover plate, and the first insulating member is molded on the inner side of the cover plate by injection molding and wraps the positioning protrusion.

[0005] In the above technical solution, further, the positioning protrusion is a flange structure punched out along the outer periphery of the mounting through hole.

[0006] In any of the above technical solutions, further, a first limiting ring portion is formed on the outer periphery of the structure of the pole located on the inner side of the cover plate, and the first insulating member is a slot structure and is adapted to the first limiting ring portion.

[0007] In any of the above technical solutions, further, the cover plate assembly also includes a sealing ring and a second insulating member; wherein, another part of the structure of the pole extends to the outside of the cover plate, and the second insulating member is arranged between the outer side of the cover plate; the sealing ring is sleeved on the outside of the pole, and is pressed into the mounting through hole by the second insulating member to separate the pole from the cover plate.

[0008] In any of the above technical solutions, further, along the outer side of the cover plate toward the inner side thereof, the mounting through hole is a multi-step hole, and the diameter of the hole gradually decreases.

[0009] In any of the above technical solutions, further, the mounting through hole is a two-stage step hole.

[0010] In any of the above technical solutions, further, a second limiting ring portion is formed on the outer periphery of the structure of the pole located outside the cover plate, and the cover plate assembly also includes a second insulating member, which is a slot structure and is adapted to the second limiting ring portion.

[0011] In any of the above technical solutions, further, the second insulating member is formed with a positioning groove, and a partial structure of the sealing ring extends into the positioning groove.

[0012] In any of the above technical solutions, further, the inner surface of the cover plate located at the outer periphery of the first insulating member is provided with an insulating coating.

[0013] The present application also provides a battery cell, comprising a housing, an electrode group, and a cover plate assembly as described in any of the above technical solutions, wherein the electrode group is installed in the housing, and the cover plate assembly is installed at the open end of the housing. Therefore, all the beneficial technical effects of the cover plate assembly are obtained, which will not be described in detail here.

[0014] Compared with the prior art, the beneficial effects of this application are:

[0015] In the cover plate assembly provided in the present application, the first insulating member is integrally injection-molded with the cover plate, and a positioning protrusion is provided on the cover plate to increase the strength of the integral injection-molded combination of the lower plastic and the cover plate, thereby avoiding problems such as gaps, unevenness or displacement when the first insulating member and the cover plate are assembled, achieving better dimensional accuracy, improving the safety performance of the cover plate assembly, and ensuring smooth assembly of the cover plate assembly and the shell, thereby improving production efficiency.

[0016] Moreover, the positioning protrusion is a flange arranged along the outer periphery of the mounting through hole, and preferably, the flange is formed by stamping, that is, the flange is stamped out on the outer periphery of the mounting through hole, which is simple and convenient to operate and has high production efficiency. Moreover, the flange and the cover plate are an integrated structure, which has higher strength and is not easy to be damaged.

[0017] In addition, the cover eliminates all lower plastic structures except the pole position, and an insulating coating is set on the inner side of the cover. The structure is simple, the molding process is mature and the cost is low, which can achieve ultimate space improvement and cost reduction.

[0018] In addition, two limiting rings are provided at both ends of the pole, and the first insulating member injection molded on the cover is wrapped around the outside of the first limiting ring, and the second insulating member is wrapped around the outside of the second limiting ring, so that the pole is firmly assembled with the first insulating member, the second insulating member and the cover, and structures such as rivet blocks are removed, thereby reducing resistance and improving current carrying capacity, simplifying assembly steps, improving assembly efficiency, reducing the number of parts and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 An exploded view of a cover plate assembly provided in an embodiment of the present application;

[0021] Figure 2 Another exploded view of the cover plate assembly provided in an embodiment of the present application;

[0022] Figure 3 An assembly diagram of a cover plate assembly provided in an embodiment of the present application;

[0023] Figure 4 for Figure 3 Cross-sectional view along section AA;

[0024] Figure 5 for Figure 4 A partial enlarged view of

[0025] Figure 6 A schematic diagram of the structure of the cover plate provided in an embodiment of the present application;

[0026] Figure 7 for Figure 6 A partial enlarged view of .

[0027] Reference numerals:

[0028] 1-cover plate, 11-installation through hole, 12-positioning protrusion, 2-pole, 21-column, 22-first limiting ring, 23-second limiting ring, 3-first insulating member, 4-sealing ring, 5-second insulating member, 51-positioning groove, 6-insulating coating. DETAILED DESCRIPTION

[0029] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0030] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0031] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0032] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] Refer to the following Figures 1 to 7 The cover plate assembly and the battery cell according to some embodiments of the present application are described.

[0035] Embodiment 1

[0036] See also Figures 1 to 7 As shown, an embodiment of the present application provides a cover plate assembly, comprising: a cover plate 1, a pole 2 and a first insulating member 3; wherein the pole 2 is installed in the mounting through hole 11 of the cover plate 1, and a part of the structure of the pole 2 extends to the inner side of the cover plate 1, and the first insulating member 3 is arranged between the inner side of the cover plate 1; a positioning protrusion 12 is formed on the inner side of the cover plate 1, and the first insulating member 3 is molded on the inner side of the cover plate 1 by injection molding, and wraps the positioning protrusion 12.

[0037] According to the structure described above, the first insulating member 3 is integrally injection-molded with the cover plate 1, and a positioning protrusion 12 is provided on the cover plate 1 to increase the strength of the integral injection-molded combination of the lower plastic and the cover plate 1, thereby avoiding problems such as gaps, unevenness or displacement when the first insulating member 3 and the cover plate 1 are assembled, achieving better dimensional accuracy, improving the safety performance of the cover plate assembly, and ensuring smooth assembly of the cover plate assembly and the shell, thereby improving production efficiency.

[0038] It should be noted that the inner side of the cover plate 1 refers to the side close to the electrode group, and the outer side of the cover plate 1 refers to the side away from the electrode group, that is, the side exposed to the shell of the battery cell.

[0039] In this embodiment, preferably, Figures 5 to 7 As shown, the positioning protrusion 12 is a flange arranged along the outer periphery of the mounting through hole 11, and preferably, the flange is formed by stamping.

[0040] According to the structure described above, it can be seen that punching a flange on the outer periphery of the mounting through hole 11 is simple and convenient to operate, with high production efficiency. Moreover, the flange and the cover plate 1 are an integrated structure, which has higher strength and is not easy to be damaged.

[0041] Further, preferably, there are multiple flanges, and they are arranged in sequence along the outer circumference of the mounting through hole 11. Of course, it is not limited to this. The number of flanges is one. On this basis, for example, the flange can be an annular structure, or a part of an annular structure, etc., which is selected according to actual needs.

[0042] It should be noted that the structure of the positioning protrusion 12 is not limited to the above-mentioned flange structure formed by stamping, it can also be a plurality of protruding block structures sequentially arranged at intervals on the outer periphery of the mounting hole 11, and the positioning protrusion 12 can be an integral structure with the cover plate 1, or a split structure, connected to the cover plate 1 by gluing or welding.

[0043] In this embodiment, preferably, Figure 1 , Figure 2 and Figure 5 As shown, the outer periphery of the structure of the pole 2 located inside the cover plate 1 is formed with a first limiting ring portion 22, that is, the pole 2 includes a column 21, the column 21 is installed in the installation through hole 11 of the cover plate 1, and one end of the column 21, that is, the first end, extends to the inner side of the cover plate 1, and the first limiting ring portion 22 is arranged around the outer periphery of the first end of the column 21;

[0044] The first insulating member 3 is a slot structure and is matched with the first limiting ring portion 22 .

[0045] According to the structure described above, it can be known that the first limiting ring portion 22 cooperates with the inner side of the cover plate 1 to form a limit, thereby limiting the pole 2, and the first insulating member 3 is wrapped around the side surface of the first limiting ring portion 22 close to the cover plate 1 and the outer peripheral surface of the first limiting ring portion 22, thereby providing better insulation protection and further limiting the pole 2.

[0046] Further, preferably, the column 21 and the first limiting ring portion 22 may be split structures and connected by welding.

[0047] In this embodiment, preferably, Figure 1 , Figure 2 and Figure 5 As shown, the cover assembly also includes a sealing ring 4 and a second insulating member 5; wherein another part of the structure of the pole 2 extends to the outside of the cover 1, and a second insulating member 5 is arranged between the outer side of the cover 1; the sealing ring 4 is sleeved on the outside of the pole 2, and is pressed into the mounting through hole 11 by the second insulating member 5 to separate the pole 2 from the cover 1.

[0048] According to the structure described above, it can be known that installing the sealing ring 4 between the cover plate 1 and the second insulating member 5 makes assembly simpler, saves the internal space of the battery cell, improves space utilization, and increases the capacity of the battery cell. In addition, the sealing ring 4 also serves to separate the pole 2 and the cover plate 1, that is, it serves as an insulating protection.

[0049] In this embodiment, preferably, Figure 1 and Figure 5 As shown, along the outer side of the cover plate 1 toward the inner side thereof, the mounting through hole 11 is a two-stage step hole, and the diameter of the hole gradually decreases, that is, the mounting through hole 11 includes two holes, namely a first hole portion and a second hole portion, and the first hole portion is arranged close to the first insulating member 3, and the second hole portion is arranged close to the second insulating member 5, and the size of the first hole portion is smaller than the size of the second hole portion.

[0050] According to the structure described above, the small hole in the secondary step hole close to the first insulating member 3 can play a role in preliminary positioning of the sealing ring 4, so that the sealing ring 4 and the cover plate 1 are assembled more firmly and stably.

[0051] It should be noted that the mounting through hole 11 is not limited to a two-step hole, but may also be a three-step hole or a four-step hole, etc., and is specifically designed according to actual needs.

[0052] In addition, it should be noted that the sealing ring 4 will be compressed and deformed to match the shape of the mounting through hole 11 .

[0053] In this embodiment, preferably, Figure 1 , Figure 2 and Figure 5As shown, a second limiting ring portion 23 is formed on the outer periphery of the structure of the pole 2 located outside the cover plate 1 , and the cover plate assembly further includes a second insulating member 5 , which is a slot structure and is adapted to the second limiting ring portion 23 .

[0054] According to the structure described above, it can be known that the second limiting ring portion 23 cooperates with the outer side of the cover plate 1 to form a limit, thereby limiting the pole 2, and the second limiting ring portion 23 of the second insulating member 5 is close to the side surface of the cover plate 1 and the outer peripheral surface of the second limiting ring portion 23, which plays a role in better insulation protection and further limiting the pole 2.

[0055] It can be seen that two limiting rings are provided at both ends of the pole 2, the first insulating member 3 injection molded on the cover plate 1 is wrapped around the outside of the first limiting ring 22, and the second insulating member 5 is wrapped around the outside of the second limiting ring 23, so that the pole 2 is firmly assembled with the first insulating member 3, the second insulating member 5 and the cover plate 1, and structures such as rivet blocks are removed, the resistance is reduced, the current carrying capacity is improved, and the assembly steps are simplified, the assembly efficiency is improved, the number of parts is reduced, and the cost is reduced.

[0056] Further, preferably, the column 21 and the second limiting ring portion 23 may be an integral structure or a split structure, and are connected by welding.

[0057] Further, preferably, the column 21 is a cylinder, and the first limiting ring and the second limiting ring are both circular rings, so that the shape of the pole 2 is more regular, convenient for processing and manufacturing, and can improve assembly accuracy. Of course, it is not limited to this, and can also be designed according to actual needs.

[0058] In this embodiment, preferably, Figure 5 As shown, the second insulating member 5 is formed with a positioning groove 51 , and a portion of the structure of the sealing ring 4 extends into the positioning groove 51 .

[0059] According to the structure described above, it can be known that the positioning groove 51 plays a role in positioning the sealing ring 4, thereby improving the assembly accuracy and sealing effect.

[0060] In this embodiment, preferably, Figures 5 to 7 As shown, the inner surface of the cover plate 1 located at the outer periphery of the first insulating member 3 is provided with an insulating coating 6 .

[0061] According to the structure described above, it can be known that the structure of the cover plate 1 is redesigned in the present application, and all lower plastic structures except the position of the pole 2 are eliminated, and only a thinner insulating coating 6 is set on the cover plate 1, which occupies less space, that is, the space occupied by the pole group is reduced. For example, the height space can be saved by about 3-4mm, which greatly improves the space utilization rate and the capacity of the battery cell. Moreover, the insulating sheet is tightly attached to the cover plate 1, and the cover plate 1 is used as the basis. The whole is not easy to deform, so there will be no situation where the pole ear is stuck in the gap.

[0062] Further, preferably, the material of the insulating coating 6 may be thermoplastic polyester or high-performance fluoroplastic, etc. Of course, it is not limited thereto, and the material of the insulating sheet may also be selected according to actual needs.

[0063] It should be noted that the cover plate assembly provided in the present application is not limited to application on blade batteries, but can also be applied to square aluminum shell batteries, depending on actual needs.

[0064] Embodiment 2

[0065] Embodiment 2 of the present application further provides a battery cell, comprising the cover plate assembly described in the above embodiment 1, and thus has all the beneficial technical effects of the cover plate assembly, and the same technical features and beneficial effects are not repeated here.

[0066] It should be noted that: an opening can be formed at one end of the shell along a preset direction, and this opening is equipped with the cover assembly in the present application. Of course, it is not limited to this, and can also be designed according to actual needs. For example: openings are formed at both ends of the shell along the preset direction, and each opening is equipped with a cover assembly, or one of the openings is equipped with a cover assembly, and the other opening is equipped with an ordinary cover 1 structure in the prior art, etc., which is selected according to actual needs, and the aforementioned preset direction can be the length square of the shell, or it can be the height direction of the shell, which is selected according to actual needs.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate, a pole and a first insulating member; wherein the pole is installed in the mounting through hole of the cover plate, and a part of the structure of the pole extends to the inner side of the cover plate, and the first insulating member is arranged between the inner side of the cover plate; a positioning protrusion is formed on the inner side of the cover plate, and the first insulating member is molded on the inner side of the cover plate by injection molding and wraps the positioning protrusion.

2. The cover plate assembly according to claim 1, characterized in that: The positioning protrusion is a flange structure punched out along the outer circumference of the mounting through hole.

3. The cover plate assembly according to claim 1, characterized in that: A first limiting ring portion is formed on the outer periphery of the structure of the pole located on the inner side of the cover plate, and the first insulating member is a slot structure and is matched with the first limiting ring portion.

4. The cover plate assembly according to claim 1, characterized in that: The cover plate assembly also includes a sealing ring and a second insulating member; wherein another part of the structure of the pole extends to the outside of the cover plate, and the second insulating member is arranged between the outer side of the cover plate; the sealing ring is sleeved on the outside of the pole and is pressed into the mounting through hole by the second insulating member to separate the pole from the cover plate.

5. The cover plate assembly according to claim 4, characterized in that: Along the outer side of the cover plate toward the inner side thereof, the mounting through hole is a multi-step hole, and the diameter of the hole gradually decreases.

6. The cover plate assembly according to claim 5, characterized in that: The mounting through hole is a two-stage step hole.

7. The cover plate assembly according to claim 5, characterized in that: A second limiting ring portion is formed on the outer periphery of the structure of the pole located outside the cover plate, and the cover plate assembly further includes a second insulating member, which is a slot structure and is adapted to the second limiting ring portion.

8. The cover plate assembly according to claim 7, characterized in that: The second insulating member is formed with a positioning groove, and a portion of the sealing ring extends into the positioning groove.

9. The cover plate assembly according to any one of claims 1 to 8, characterized in that: The inner surface of the cover plate located at the outer periphery of the first insulating member is provided with an insulating coating.

10. A battery cell, characterized in that: It comprises a shell, a pole group and a cover plate assembly as claimed in any one of claims 1 to 9; wherein the pole group is installed in the shell, and the cover plate assembly is installed at the open end of the shell.

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