Cover plate assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a cover plate assembly and a battery, which comprises a cover plate, a pole, a first insulating glue layer and a second insulating glue layer, the pole column comprises a first column body and a second column body, the first column body penetrates through the cover plate, the first insulating glue layer and the second insulating glue layer, the two ends of the first column body penetrate out of the cover plate, and the circumferential surface of the first column body and the inner wall of the first through hole are arranged at an interval; the end face of the second column body is connected with the end face of the first column body, and the other end of the first column body is riveted to form a third column body. The first insulating glue layer is arranged between the cover plate and the third column body; the second insulating glue layer is arranged between the cover plate and the second column body; the end face, away from the first column body, of the third column body is a welding face, and the flatness of the welding face is smaller than or equal to 0.2 mm and is not zero. According to the cover plate assembly and the battery provided by the embodiment of the utility model, the flatness of the welding surface of the pole is controlled within 0.2 mm in actual production, and the tab is stably welded on the pole, so that insufficient welding is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a cover plate assembly and a battery. Background Art

[0002] The existing steel shell battery includes a battery cell, a shell and a cover assembly, and the cover assembly includes an insulating rubber layer, a cover and a pole, wherein the pole passes through the cover and is connected to the cover by a riveting process, and the insulating rubber layer is used to insulate the pole and the cover.

[0003] After the riveting process, the shape of the pole changes, which affects the flatness of the pole surface. In particular, the poor flatness of the welding surface for welding the pole lugs will lead to poor welding of the pole lugs. Therefore, the flatness of the welding surface needs to be controlled. However, the existing production process generally relies on experience to control the flatness of the welding surface, which cannot guarantee the welding quality between the pole and the lug. Utility Model Content

[0004] The technical problem to be solved by the utility model is: to provide a high-voltage distribution box in view of the problem that the existing production process generally relies on experience to control the flatness of the welding surface and cannot ensure the welding quality of the pole and the pole ear.

[0005] In order to solve the above technical problems, the embodiment of the utility model provides a cover plate assembly.

[0006] It comprises a cover plate, a pole, a first insulating rubber layer and a second insulating rubber layer; the cover plate is provided with a first through hole, the first insulating rubber layer is provided with a second through hole, and the second insulating rubber layer is provided with a third through hole;

[0007] The pole comprises a first column and a second column, the first column is inserted into the first through hole, the second through hole and the third through hole and riveted to the cover plate, both ends of the first column pass through the cover plate, and the outer circumference of the first column and the inner wall of the first through hole are spaced apart;

[0008] One end of the second column is connected to one end of the first column, and the other end of the first column forms a third column;

[0009] The first insulating adhesive layer is disposed between the cover plate and the third column to be used for insulating the cover plate and the third column;

[0010] The second insulating adhesive layer is disposed between the cover plate and the second column to insulate the cover plate and the second column;

[0011] An end surface of the third column away from the first column is a welding surface, and a flatness of the welding surface is greater than 0 and less than or equal to 0.2 mm.

[0012] Optionally, it also includes a clamping ring sleeved outside the first column, the clamping ring is arranged between the third column and the first insulating rubber layer, and the surface of the third column close to the first column overlaps the surface of the clamping ring away from the first insulating rubber layer.

[0013] Optionally, the end face of the first column close to the third column is flush with the surface of the clamping ring away from the first insulating rubber layer, so that the end face of the third column is in close contact with the clamping ring; the end face of the first column close to the second column is flush with the surface of the second insulating rubber layer away from the cover plate, so that the end face of the second column is in close contact with the second insulating rubber layer.

[0014] Optionally, the first column is a cylinder before the pole is riveted;

[0015] When the pole is riveted, the outer circumference of the first column protrudes outward and the cross section of the first column remains circular, so that the diameter of the cross section of the first column after riveting gradually decreases from the middle to both ends;

[0016] The difference between the maximum value of the diameter of the cross section of the first column after riveting and the diameter of the first column before riveting is a, and the diameter of the first column before riveting is b, then a / b is less than or equal to 1.6%.

[0017] Optionally, an insulating rubber sleeve is further included, which is arranged in the gap between the first column and the inner wall of the first through hole, the outer circumference of the insulating rubber sleeve is tightly attached to the inner wall of the first through hole, and part of the inner circumference of the insulating rubber sleeve abuts against the outer circumference of the first column.

[0018] Optionally, the second column is a circular cylinder or a polygonal column.

[0019] Optionally, an outer edge of an orthographic projection of the first insulating adhesive layer on the first side surface of the cover plate is located outside an outer edge of an orthographic projection of the clamping ring on the first side surface of the cover plate.

[0020] Optionally, an outer edge of an orthographic projection of the second insulating adhesive layer on the first side surface of the cover plate is located outside an outer edge of an orthographic projection of the second column on the first side surface of the cover plate.

[0021] On the other hand, the embodiment of the utility model further provides a battery, comprising a pole core, a shell and the above-mentioned cover plate assembly, wherein the shell has an inner cavity with a one-way opening, the pole core is arranged in the inner cavity, the cover plate and the shell are fixedly connected to close the inner cavity, and the cover plate and the shell constitute the outer shell of the battery;

[0022] The third column is arranged in the inner cavity, and the second column is arranged outside the outer shell of the battery.

[0023] On the other hand, the embodiment of the utility model further provides a battery, comprising a pole core, a shell and the above-mentioned cover plate assembly, wherein the shell is provided with a closed inner cavity, the pole core is arranged in the inner cavity, and one of the side walls of the shell constitutes the cover plate;

[0024] The third column is arranged in the inner cavity, and the second column is arranged outside the shell.

[0025] According to the cover plate assembly and battery of the embodiment of the utility model, the surface of the third cylinder away from the cover plate is the welding surface. In actual production, the flatness of the welding surface is controlled within 0.2 mm, so that the tabs are stably welded to the welding surface of the pole, reducing the occurrence of cold welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the cover plate assembly provided by the first embodiment of the utility model before the pole is riveted;

[0027] Figure 2 It is a schematic structural diagram of the cover plate assembly provided by the first embodiment of the utility model after the pole is riveted;

[0028] Figure 3 It is a schematic diagram of the planarity distribution of a qualified battery provided by the first embodiment of the utility model;

[0029] Figure 4 It is a schematic diagram of the structure of a battery provided in the third embodiment of the utility model.

[0030] The reference numerals in the specification are as follows:

[0031] 1. Pole; 11. First column; 12. Second column; 13. Third column; 2. Cover plate; 21. First through hole; 3. First insulating rubber layer; 4. Second insulating rubber layer; 5. Clamp; 6. Welding surface; 7. Insulating rubber ring; 8. Shell. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0033] First embodiment

[0034] like Figure 1 and Figure 2As shown, a cover plate assembly provided by the first embodiment of the utility model includes a cover plate 2, a pole 1, a first insulating rubber layer 3 and a second insulating rubber layer 4; a first through hole 21 is provided on the cover plate 2, a second through hole is provided on the first insulating rubber layer 3, and a third through hole is provided on the second insulating rubber layer 4. Among them, the first through hole 21, the second through hole and the third through hole are coaxially arranged. The pole 1 includes a first column 11 and a second column 12, the first column 11 is penetrated in the first through hole 21, the second through hole and the third through hole, the two ends of the first column 11 pass through the cover plate 2, and the outer peripheral surface of the first column 11 and the inner wall of the first through hole 21 are spaced apart. The end face of one end of the second column 12 is connected to the end face of one end of the first column 11, and the other end of the first column 11 is riveted to form a third column 13. The first insulating rubber layer 3 is arranged between the cover plate 2 and the third column 13 to be used for insulation between the cover plate 2 and the third column 13; the second insulating rubber layer 4 is arranged between the cover plate 2 and the second column 12 to be used for insulation between the cover plate 2 and the second column 12; the end surface of the third column 13 away from the first column 11 is a welding surface 6, and the flatness of the welding surface 6 is less than or equal to 0.2 mm and the flatness is not zero.

[0035] The pole 1 in this embodiment includes a first column 11 and a second column 12 before riveting, but after riveting, one end of the first column 11 away from the second column 12 is compressed to form a third column 13. The first column 11, the second column 12 and the third column 13 make the pole 1 in an I-shape, the second column 12 and the third column 13 are respectively located on both sides of the cover plate 2, and the second column 12 and the third column 13 cannot penetrate from the first through hole 21, so that the pole 1 will not be separated from the cover plate 2, that is, the effect of riveting the pole 1 to the cover plate 2 is achieved.

[0036] The cover plate 2 and the pole 1 are insulated by the first insulating adhesive layer 3 and the second insulating adhesive layer 4 , and the pole 1 and the inner wall of the first through hole 21 are spaced apart for insulation purposes.

[0037] Most importantly, in this embodiment, the surface of the third cylinder away from the cover plate 2 is the welding surface 6. In actual production, the flatness of the welding surface 6 is controlled within 0.2 mm, so that the pole ear is stably welded on the welding surface 6 of the pole 1, reducing the occurrence of cold welding. In this embodiment, qualified batteries are also tested. Referring to the accompanying drawings, it is found that the flatness of the welding surface 6 of 64 batteries is within 0.2 mm. In the figure, the horizontal axis is the flatness, the vertical axis is the number of occurrences, that is, the frequency, N is 64, the mean of the flatness is 0.01386, and the standard deviation of the flatness is 0.002382. It can be intuitively seen that the number of qualified batteries with a flatness between 0.12 and 0.16 is the largest.

[0038] In this embodiment, the cover plate assembly further includes a snap ring 5 sleeved outside the first column 11, the snap ring 5 is arranged between the third column 13 and the first insulating adhesive layer 3, and the surface of the third column 13 close to the first column 11 overlaps the surface of the snap ring 5 away from the first insulating adhesive layer 3. During riveting, since the end of the first column 11 away from the second column 12 is deformed the most, the snap ring 5 is specially arranged here, and the deformed third cylinder overlaps on the snap ring 5. If it is directly overlapped on the first insulating adhesive layer 3 during riveting, the third cylinder must directly squeeze the first insulating adhesive layer 3 to cause the first insulating adhesive layer 3 to rupture, thereby increasing the probability of the third cylinder and the cover plate 2 contacting, and the contact between the third cylinder and the cover plate 2 means a short circuit, which makes the battery scrapped. The provision of the snap ring 5 can reduce the influence of the riveting deformation of the first pole 1 on the first insulating adhesive layer 3.

[0039] Referring to the accompanying drawings, the end face of the first column 11 close to the third column 13 is flush with the surface of the clamping ring 5 away from the first insulating rubber layer 3, so that the end face of the third column 13 is in close contact with the clamping ring 5; the end face of the first column 11 close to the second column 12 is flush with the surface of the second insulating rubber layer 4 away from the cover plate 2, so that the end face of the second column 12 is in close contact with the second insulating rubber layer 4.

[0040] Referring to the accompanying drawings, in this embodiment, before the pole 1 is riveted, the first cylinder 11 is a cylinder, and the profile of the longitudinal section of the outer circumference of the first cylinder is a straight line, which is represented by a dotted straight line m in the figure. When the pole 1 is riveted, the outer circumference of the first cylinder 11 protrudes outward and the cross section of the first cylinder 11 is still circular, so that the diameter of the cross section of the first cylinder 11 after riveting gradually decreases from the middle to both ends, and the profile of the longitudinal section of the outer circumference of the first cylinder after riveting is an arc, which is represented by an arc solid line n in the figure; the difference between the maximum value of the diameter of the cross section of the first cylinder 11 after riveting and the diameter of the first cylinder 11 before riveting is a, the diameter of the end of the first cylinder 11 is b, that is, the diameter of the first cylinder 11 before riveting is b, then a / b is less than or equal to 1.6%.

[0041] During riveting, the first column 11 is squeezed, so that its outer circumference gradually expands outward, so that the longitudinal section profile of the outer circumference is an arc-shaped solid line n, rather than a virtual straight line m before riveting. As the first column 11 expands outward, the interval between it and the inner wall of the first through hole 21 becomes smaller. If the interval is too small, it is easy to cause a short circuit between the pole 1 and the cover plate 2. Therefore, in this embodiment, the radial deformation of the first column 11 is also controlled to reduce the occurrence of short circuits.

[0042] Furthermore, the cover plate assembly further includes an insulating rubber sleeve, which is disposed in the interval between the first column 11 and the inner wall of the first through hole 21, the outer circumference of the insulating rubber sleeve is in close contact with the inner wall of the first through hole 21, a portion of the inner circumference of the insulating rubber sleeve abuts against the outer circumference of the first column 11, and the outer wall of one end of the insulating rubber sleeve close to the second column 12 is connected to the second insulating rubber layer 4. In this embodiment, the insulating rubber sleeve is mainly used to enhance the insulation between the pole 1 and the cover plate 2. In this embodiment, the insulating rubber sleeve and the second insulating rubber layer 4 are integrally formed.

[0043] In this embodiment, the second column 12 is a polygonal column, and this embodiment takes a quadrangular column as an example. In other embodiments, the second column 12 can also be a cylinder.

[0044] In this embodiment, the outer edge of the orthographic projection of the first insulating rubber layer 3 on the first side surface of the cover plate 2 is located outside the outer edge of the orthographic projection of the snap ring 5 on the first side surface of the cover plate 2. The outer edge of the first insulating rubber layer 3 is larger than the outer edge of the snap ring 5, so that it is difficult for the snap ring 5 to touch the cover plate 2. Similarly, the outer edge of the orthographic projection of the second insulating rubber layer 4 on the first side surface of the cover plate 2 is located outside the outer edge of the orthographic projection of the second column 12 on the first side surface of the cover plate 2.

[0045] The first side surface of the cover plate 2 is the lower surface of the cover plate. Of course, in other embodiments, the first side surface of the cover plate 2 is the upper surface of the cover plate.

[0046] Second embodiment

[0047] The second embodiment of the utility model also provides a battery, including a pole core, a shell and the above-mentioned cover plate assembly, the shell has a one-way opening inner cavity, the pole core is arranged in the inner cavity, the cover plate and the shell are fixedly connected to close the inner cavity, and the cover plate and the shell constitute the outer shell of the battery. The third column is arranged in the inner cavity, and the second column is arranged outside the outer shell of the battery.

[0048] The cover plate and the shell of the present application are two separate parts.

[0049] Third embodiment

[0050] The third embodiment of the utility model also provides a battery, including a pole core, a shell 8 and the above-mentioned cover plate assembly, the shell 8 is provided with a closed inner cavity, the pole core is arranged in the inner cavity, one of the side walls of the shell 8 constitutes the cover plate 2, that is, one side wall of the shell 8 is the cover plate 2; the third column 13 is arranged in the inner cavity, and the second column 12 is arranged outside the shell 8.

[0051] Different from the second embodiment, the cover plate 2 in this embodiment is a side wall of the housing 8. The housing 8 in this embodiment is generally split, that is, the housing 8 includes two separate sub-shells. Figure 4Only one of the subshells is shown in the figure, and each of the two separate subshells is provided with a subcavity, and the two subcavities are assembled into an inner cavity. After the pole core is placed in the subcavity, the two subshells are connected as a whole, so that the inner cavity is closed.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cover plate assembly, characterized in that: It comprises a cover plate, a pole, a first insulating rubber layer and a second insulating rubber layer; the cover plate is provided with a first through hole, the first insulating rubber layer is provided with a second through hole, and the second insulating rubber layer is provided with a third through hole; The pole comprises a first column and a second column, the first column is inserted into the first through hole, the second through hole and the third through hole and riveted to the cover plate, both ends of the first column pass through the cover plate, and the outer circumference of the first column and the inner wall of the first through hole are spaced apart; One end of the second column is connected to one end of the first column, and the other end of the first column forms a third column; The first insulating adhesive layer is disposed between the cover plate and the third column to be used for insulating the cover plate and the third column; The second insulating adhesive layer is disposed between the cover plate and the second column to insulate the cover plate and the second column; An end surface of the third column away from the first column is a welding surface, and a flatness of the welding surface is greater than 0 and less than or equal to 0.2 mm.

2. The cover plate assembly according to claim 1, characterized in that: It also includes a clamping ring sleeved outside the first column, the clamping ring is arranged between the third column and the first insulating rubber layer, and the surface of the third column close to the first column overlaps the surface of the clamping ring away from the first insulating rubber layer.

3. The cover plate assembly according to claim 2, characterized in that: The end surface of the first column close to the third column is flush with the surface of the clamping ring away from the first insulating rubber layer, so that the end surface of the third column is in close contact with the clamping ring; the end surface of the first column close to the second column is flush with the surface of the second insulating rubber layer away from the cover plate, so that the end surface of the second column is in close contact with the second insulating rubber layer.

4. The cover plate assembly according to claim 1, characterized in that: The first column is a cylinder before the pole is riveted; When the pole is riveted, the outer circumference of the first column protrudes outward and the cross section of the first column remains circular, so that the diameter of the cross section of the first column after riveting gradually decreases from the middle to both ends; The difference between the maximum value of the diameter of the cross section of the first column after riveting and the diameter of the first column before riveting is a, and the diameter of the first column before riveting is b, then a / b is less than or equal to 1.6%.

5. The cover plate assembly according to claim 1, characterized in that: It also includes an insulating rubber sleeve, which is arranged in the gap between the first column and the inner wall of the first through hole. The outer circumference of the insulating rubber sleeve is in close contact with the inner wall of the first through hole, and part of the inner circumference of the insulating rubber sleeve abuts against the outer circumference of the first column.

6. The cover plate assembly according to claim 1, characterized in that: The second column is a circular column or a polygonal column.

7. The cover plate assembly according to claim 2, characterized in that: The outer edge of the orthographic projection of the first insulating adhesive layer on the first side surface of the cover plate is located outside the outer edge of the orthographic projection of the clamping ring on the first side surface of the cover plate.

8. The cover plate assembly according to claim 1, characterized in that: An outer edge of an orthographic projection of the second insulating adhesive layer on the first side surface of the cover plate is located outside an outer edge of an orthographic projection of the second column on the first side surface of the cover plate.

9. A battery, characterized in that: A battery cell comprising a core, a shell and a cover plate assembly according to any one of claims 1 to 8, wherein the shell has an inner cavity with a one-way opening, the core is arranged in the inner cavity, the cover plate and the shell are fixedly connected to close the inner cavity, and the cover plate and the shell form a battery housing; The third column is arranged in the inner cavity, and the second column is arranged outside the battery housing.

10. A battery, characterized in that: It comprises a pole core, a shell and a cover plate assembly according to any one of claims 1 to 8, wherein the shell is provided with a closed inner cavity, the pole core is arranged in the inner cavity, and one of the side walls of the shell constitutes the cover plate; The third column is arranged in the inner cavity, and the second column is arranged outside the shell.

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