Battery cell cover plate assembly and battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell cover plate assembly and a battery cell, the battery cell cover plate assembly comprises a cover plate and a lower insulating part, and the lower insulating part is mounted on the inner side surface of the cover plate; the two sides, extending in the length direction of the cover plate, of the cover plate are each provided with a first assembly inclined face, and the two first assembly inclined faces are oppositely and obliquely arranged in the direction, facing the lower insulating part, of the cover plate. The two sides, extending in the length direction of the lower insulating part, of the lower insulating part are provided with second assembly inclined faces, and any second assembly inclined face is connected with the corresponding first assembly inclined face. And the second assembly inclined planes on the two sides of the lower insulating part are oppositely and obliquely arranged along the direction from the cover plate to the lower insulating part. Therefore, the two sides, matched with the two long edges of the shell, of the lower insulating part are both provided with the second assembly inclined planes, and then the second assembly inclined planes are connected with the first assembly inclined planes on the two long edge sides of the cover plate to form a whole guide structure, so that the interference problem cannot occur in the assembly process of the cover plate assembly and the shell, the shell is prevented from being crushed, and the service life of the cover plate assembly is prolonged. And the yield of battery cell production is improved.

Description

Technical Field

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

[0002] At present, with the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing. Lithium cells are key components in lithium-ion batteries, such as Figure 1 and Figure 2 As shown, it includes a shell 3', an electrode group and a lithium battery cover plate, etc. The electrode group is installed in the shell 3', and the lithium battery cover plate is installed at the open end of the shell 3', wherein the lithium battery cover plate includes a bare aluminum plate 1' and a lower plastic 2' and other structures, the lower plastic 2' is installed below the bare aluminum plate 1', and the lithium battery cover plate plays the role of welding with the shell 3' to form a sealed cavity, leading out the positive and negative electrodes of the electrode group, and serving as an assembly carrier. In order to facilitate the assembly of the bare aluminum plate 1' and the shell 3' of the lithium battery cover plate, the length and width of the lower plastic 2' are often made smaller than the length and width of the bare aluminum plate 1', which leads to the formation of a platform step surface 11' between the chamfered edge of the bare aluminum plate 1' and the lower plastic 2', and the shell 3' is long and thin. When the lithium battery cover plate and the shell 3' are in a state, the long side edge of the shell 3' opening will collide with the platform step plane 11', which will cause the shell 3' to be crushed, resulting in a high degree of defective battery production. Utility Model Content

[0003] The purpose of the present application is to provide a battery cover assembly and a battery cell, which to a certain extent solves the technical problem in the prior art that when the lithium battery cover and the shell are assembled, the two will collide and interfere, thereby causing the shell to be crushed and damaged.

[0004] The present application provides a cell cover plate assembly, comprising: a cover plate and a lower insulating member; wherein, along the height direction of the cover plate, the lower insulating member is mounted on the inner surface of the cover plate; both sides of the cover plate extending along the length direction thereof are formed with first assembly inclined surfaces, and along the direction of the cover plate toward the lower insulating member, two first assembly inclined surfaces are arranged to be inclined toward each other;

[0005] The lower insulating member has second assembly slopes formed on both sides extending along its length direction, and any of the second assembly slopes is connected to the corresponding first assembly slope; along the direction of the cover plate toward the lower insulating member, the second assembly slopes on both sides of the lower insulating member are inclined toward each other.

[0006] In the above technical solution, further, mounting protrusion portions are formed on at least one side of the lower insulating member along its width direction, and a second assembly inclined surface is formed on one side of any one of the mounting protrusion portions facing away from the lower insulating member.

[0007] In any of the above technical solutions, further, the number of mounting protrusion portions on at least one side of the lower insulating member is multiple, and they are sequentially arranged at intervals along the length direction of the lower insulating member.

[0008] In any of the above technical solutions, further, the mounting protrusion portion is a wedge-shaped block, and it is tapered along the direction of the cover plate facing the lower insulating member.

[0009] In any of the above technical solutions, further, the cross-section of the mounting protrusion portion along the height direction of the lower insulating member is a right triangle.

[0010] In any of the above technical solutions, further, the length of the right-angle side of the mounting protrusion portion perpendicular to the height direction of the lower insulating member is 1 - 3 mm.

[0011] In any of the above technical solutions, further, an obtuse angle is formed between the second assembly inclined surface and the first assembly inclined surface, or the second assembly inclined surface is flush with the first assembly inclined surface.

[0012] In any of the above technical solutions, further, the inclination angle of the first assembly inclined surface relative to the height direction of the cover plate is 30 - 60°.

[0013] In any of the above technical solutions, further, the inclination angle of the second assembly inclined surface relative to the height direction of the lower insulating member is 30 - 60°.

[0014] In any of the above technical solutions, further, both side wall surfaces of the lower insulating member extending along its width direction are parallel to the height direction of the lower insulating member.

[0015] In any of the above technical solutions, further, both the cover plate and the lower insulating member are in the shape of a cuboid, and their length directions and width directions are the same.

[0016] In any of the above technical solutions, further, a positioning protrusion portion is formed on one of the lower insulating member and the cover plate, a positioning groove is formed on the other of the lower insulating member and the cover plate, and the positioning protrusion portion is inserted into the positioning groove.

[0017] The present application also provides an electric core, including a housing, an electrode assembly, and the electric core cover plate assembly described in any of the above technical solutions. Wherein, the electrode assembly is installed in the housing, and the electric core cover plate assembly is installed at at least one open end of the housing. Therefore, all the beneficial technical effects of the electric core cover plate assembly are achieved, and will not be elaborated herein.

[0018] Compared with the prior art, the beneficial effects of the present application are as follows:

[0019] In the electric core cover plate assembly provided by the present application, second assembly inclined surfaces are designed on both sides of the lower insulating part that cooperate with the two long sides of the housing, and then are connected to the first assembly inclined surfaces on both long sides of the cover plate, thus forming the entire guiding structure. Therefore, there will be no interference problem during the assembly of the cover plate assembly and the housing, thereby avoiding damage to the housing and improving the yield rate of electric core production. Description of the Drawings

[0020] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic structural diagram of an electric core cover plate assembly provided by the prior art;

[0022] Figure 2 It is an assembly drawing of the electric core cover plate assembly provided by the prior art and the housing;

[0023] Figure 3 It is a schematic structural diagram of the lower insulating part provided by an embodiment of the present application;

[0024] Figure 4 It is another schematic structural diagram of the lower insulating part provided by an embodiment of the present application;

[0025] Figure 5 It is yet another schematic structural diagram of the lower insulating part provided by an embodiment of the present application;

[0026] Figure 6 It is an assembly drawing of the lower insulating part and the cover plate provided by an embodiment of the present application;

[0027] Figure 7 It is another assembly drawing of the lower insulating part and the cover plate provided by an embodiment of the present application;

[0028] Figure 8 It is yet another assembly drawing of the lower insulating part and the cover plate provided by an embodiment of the present application;

[0029] Figure 9 This is an assembly drawing of the cover plate assembly and the housing provided by the embodiment of the present application.

[0030] Reference numerals:

[0031] 1'-light aluminum plate, 11'-platform step surface, 2'-lower plastic, 3'-housing;

[0032] 1-cover plate, 11-first assembly inclined surface, 2-lower insulating part, 21-mounting protrusion, 211-second assembly inclined surface, 22-positioning protrusion, 3-housing. Detailed implementation manners

[0033] Next, the technical solutions of the present application will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.

[0034] Generally, the components of the embodiments of the present application described and shown in the drawings here 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 present application claimed, but merely represents the selected embodiments of the present application.

[0035] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0036] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 a limitation to the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mount", "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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0038] Next, refer to Figures 1 to 9 Describe the battery cell cover plate assembly and the battery cell according to some embodiments of the present application.

[0039] Embodiment 1

[0040] See also Figures 3 to 9 As shown, an embodiment of the present application provides a cell cover plate assembly, comprising: a cover plate 1 and a lower insulating member 2; wherein, along the height direction of the cover plate 1, the lower insulating member 2 is installed on the inner surface of the cover plate 1, and it should be noted that: the inner side of the cover plate 1 here refers to the side close to the pole group of the cell; both sides of the cover plate 1 extending along the length direction thereof are formed with first assembly inclined surfaces 11, and along the direction of the cover plate 1 toward the lower insulating member 2, the two first assembly inclined surfaces 11 are arranged to be inclined toward each other;

[0041] The lower insulating member 2 is provided with mounting protrusions 21 on both sides extending along its length direction, and a second assembly bevel 211 is formed on the side of any mounting portion facing away from the lower insulating member 2, and any second assembly bevel 211 is connected to the corresponding first assembly bevel 11; along the direction of the cover plate 1 toward the lower insulating member 2, the second assembly bevels 211 on both sides of the lower insulating member 2 are arranged to be inclined toward each other.

[0042] According to the structure described above, it can be known that second assembly bevels 211 are designed on both sides of the lower insulating member 2 that cooperate with the two long sides of the shell 3, and then connected with the first assembly bevels 11 on the two long sides of the cover plate 1, thereby forming a whole guide structure, and no interference problem will occur during the assembly of the cover plate assembly and the shell 3, thereby avoiding crushing of the shell 3 and improving the yield rate of battery cell production.

[0043] In this embodiment, preferably, Figures 3 to 6 As shown, both sides of the lower insulating member 2 along the width direction thereof are formed with mounting protrusions 21 , and a second assembly slope 211 is formed on a side of the mounting protrusions 21 on either side that is away from the lower insulating member 2 .

[0044] According to the structure described above, a mounting protrusion 21 is designed on the side of the lower insulating member 2, and a second assembly slope 211 is designed on the side of the mounting protrusion 21 away from the main body. This helps save material costs while achieving guidance and facilitates lightweight design.

[0045] It should be noted that: the present invention is not limited to the following structure "a mounting protrusion 21 is designed on the side of the lower insulating member 2, and a second assembly bevel 211 is formed on the side of the mounting protrusion 21 facing away from the lower insulating member 2", and the second assembly bevel 211 can also be directly designed on the side of the lower insulating member 2 extending along its length direction. For example, the entire side surface of the lower insulating member 2 extending along its length direction is processed into a bevel, and the specific design is based on actual needs.

[0046] In this embodiment, preferably, Figure 3, Figure 4 and Figure 6 As shown in Figure 4 and Figure 6 , the number of mounting protrusions 21 on both side parts of the lower insulating part 2 is multiple, and they are sequentially arranged at intervals along the length direction of the lower insulating part 2.

[0047] According to the structure described above, for each side of the lower insulating part 2 extending along its length direction, multiple mounting protrusions 21 are designed, and the multiple mounting protrusions 21 on each side are sequentially arranged at intervals along the length direction of the lower insulating part 2, playing a role of uniform guiding and avoiding problems such as tilting during the installation process.

[0048] It should be noted that: it is not limited to the aforementioned "mounting protrusions 21 are formed on both sides of the lower insulating part 2 along its width direction", and mounting protrusions 21 can also be provided only on one side of the lower insulating part 2 along the width direction of the lower insulating part 2, and second assembly inclined surfaces 211 are formed on the sides of these mounting protrusions 21 facing away from the lower insulating part 2.

[0049] In addition, when mounting protrusions 21 are formed on both sides of the lower insulating part 2 along its width direction, the number of mounting protrusions 21 on each side can be multiple, or only the number of mounting protrusions 21 on one side can be multiple, etc.

[0050] In this embodiment, preferably, as shown in Figure 3 Figure 3 the mounting protrusion 21 is a wedge-shaped block, and is tapered along the direction from the cover plate 1 towards the lower insulating part 2.

[0051] According to the structure described above, the mounting protrusion 21 adopts the structure of a wedge-shaped block, which can satisfy that the side part far from the lower insulating part 2 is inclined, that is, the second assembly inclined surface 211 is formed, and it is also convenient for manufacturing.

[0052] In this embodiment, preferably, as shown in Figure 3 Figure 3 and Figure 5 the cross-section of the mounting protrusion 21 along the height direction of the lower insulating part 2 is a right triangle.

[0053] According to the structure described above, the shape of the mounting protrusion 21 with the above structure is more regular and convenient for processing and manufacturing.

[0054] Furthermore, preferably, the length of the right-angle side of the mounting protrusion 21 perpendicular to the height direction of the lower insulating part 2 is 1 - 3 mm, exactly compensating for the structure of the platform step surface with the above length dimension in the prior art.

[0055] In this embodiment, preferably, as shown in Figure 8 Figure 8As shown, an obtuse angle is formed between the second assembly inclined surface 211 and the first assembly inclined surface 11. Of course, it is not limited to this, and the second assembly inclined surface 211 can be flush with the first assembly inclined surface 11, which is specifically selected according to actual needs.

[0056] In this embodiment, preferably, as Figure 8 shown, the inclination angle θ1 of the first assembly inclined surface 11 relative to the height direction of the cover plate 1 is 30 - 60°.

[0057] According to the structure described above, the first assembly inclined surface 11 with the above angle meets the assembly requirements and is also convenient for processing and manufacturing. Of course, the inclination angle of the first assembly inclined surface 11 is not limited to the above, and it can also be designed according to actual needs.

[0058] In this embodiment, preferably, as Figure 8 shown, the inclination angle θ2 of the second assembly inclined surface 211 relative to the height direction of the lower insulating part 2 is 30 - 60°.

[0059] According to the structure described above, the second assembly inclined surface 211 with the above angle meets the assembly requirements and is also convenient for processing and manufacturing. Of course, the inclination angle of the second assembly inclined surface 211 is not limited to the above, and it can also be designed according to actual needs.

[0060] In this embodiment, preferably, as Figure 3 shown, one of the lower insulating part 2 and the cover plate 1 is formed with a positioning projection part 22, and the other of the lower insulating part 2 and the cover plate 1 is formed with a positioning groove, and the positioning projection part 22 is inserted into the positioning groove.

[0061] According to the structure described above, the cooperation of the positioning projection part 22 and the positioning groove is used to play a role in installation positioning, improving the assembly efficiency of the cover plate assembly.

[0062] In this embodiment, preferably, as Figure 3 、 Figures 6 to 9 shown, both the cover plate 1 and the lower insulating part 2 are in a cuboid shape, and their length directions and width directions are the same, which are adapted to the cuboid-shaped housing 3, meeting the assembly requirements, having a simple structure, and being convenient for processing and manufacturing. Of course, it is not limited to this. When the shape of the housing 3 of the battery cell changes, the shapes of the cover plate 1 and the lower insulating part 2 also change accordingly, which is specifically selected according to actual needs.

[0063] It should be noted that: The cover plate assembly also includes other structures, such as pole columns, riveting blocks, sealing rings, etc., which are all existing structures and will not be elaborated here.

[0064] In addition, the cover plate 1 can be a light aluminum plate in the prior art. Of course, it is not limited thereto. It can also have the same function as the light aluminum plate and can be a cover plate made of other materials. The lower insulating member 2 can be a lower plastic in the prior art. Of course, it is not limited thereto. It can also have the same function as the lower plastic, but other insulating materials are used.

[0065] In addition, the battery cell cover plate assembly provided by the present application is not limited to being applied to lithium battery cells and can also be applied to other types of battery cells.

[0066] Embodiment 2

[0067] Embodiment 2 of the present application also provides a battery cell, including the battery cell cover plate assembly described in Embodiment 1 above. Therefore, it has all the beneficial technical effects of this battery cell cover plate assembly, and the same technical features and beneficial effects will not be repeated.

[0068] In this embodiment, preferably, as Figure 9 shown, the battery cell further includes a housing 3 and a pole group (the pole group is not shown in the figure). Among them, the pole group is installed in the housing 3, and at least one open end of the housing 3 is installed with the battery cell cover plate assembly. That is to say, the housing 3 can be a structure with a hollow interior and one open end, and at this time, one open end of the housing 3 is installed with the above-mentioned battery cell cover plate assembly, or the housing 3 is a structure with a hollow interior and two open ends, and both of its open ends are installed with the above-mentioned battery cell cover plate assembly, or only one of the two open ends is provided with the aforementioned battery cell cover plate assembly, and the other is a cover plate assembly with other structures, which is specifically designed according to actual needs.

[0069] According to the structure described above, second assembly inclined surfaces 211 are designed on both sides of the lower insulating member 2 that cooperate with the two long sides of the housing 3, and then are connected to the first assembly inclined surfaces 11 on the two long side edges of the cover plate 1, thereby forming the entire guiding structure. Furthermore, during the assembly process of the cover plate assembly and the housing 3, no interference problems will occur, thereby avoiding damage to the housing 3 and improving the yield rate of battery cell production.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. And 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 battery cell cover plate assembly, characterized in that, include: A cover plate and a lower insulating member; wherein the lower insulating member is mounted on the inner surface of the cover plate along the height direction of the cover plate; both sides of the cover plate extending along the length direction thereof are formed with first assembly inclined surfaces, and along the direction of the cover plate toward the lower insulating member, two first assembly inclined surfaces are arranged to be inclined toward each other; The lower insulating member has second assembly slopes formed on both sides extending along its length direction, and any of the second assembly slopes is connected to the corresponding first assembly slope; along the direction of the cover plate toward the lower insulating member, the second assembly slopes on both sides of the lower insulating member are inclined toward each other.

2. The cell cover assembly according to claim 1, wherein, A mounting protrusion is formed on at least one side of the lower insulating member along the width direction thereof, and the second assembly inclined surface is formed on a side of the mounting protrusion on any side that is away from the lower insulating member.

3. The cell cover plate assembly according to claim 2, wherein, The number of the mounting protrusions on at least one side of the lower insulating member is multiple, and the mounting protrusions are sequentially arranged at intervals along the length direction of the lower insulating member.

4. The cell cover plate assembly according to claim 2, wherein The mounting protrusion is a wedge-shaped block and is tapered along the direction from the cover plate toward the lower insulating member.

5. The cell cover plate assembly according to claim 2, characterized in that, A cross section of the mounting protrusion along a height direction of the lower insulating member is a right triangle.

6. The cell cover plate assembly according to claim 5, wherein, The length of the right-angle side of the mounting protrusion perpendicular to the height direction of the lower insulating member is 1-3 mm.

7. The cell cover plate assembly according to claim 1, wherein An obtuse angle is formed between the second assembly inclined surface and the first assembly inclined surface, or the second assembly inclined surface is flush with the first assembly inclined surface.

8. The cell cover plate assembly according to claim 1, characterized in that, The first assembly slope has an inclination angle of 30-60° relative to the height direction of the cover plate; and / or The inclination angle of the second assembly slope relative to the height direction of the lower insulating member is 30-60°.

9. The cell cover assembly according to claim 1, wherein, Both side walls of the lower insulating member extending along the width direction thereof are parallel to the height direction of the lower insulating member; and / or The cover plate and the lower insulating member are both in the shape of a cuboid, and their length and width directions are the same; and / or A positioning protrusion is formed on one of the lower insulating member and the cover plate, a positioning groove is formed on the other of the lower insulating member and the cover plate, and the positioning protrusion is inserted into the positioning groove.

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

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