Cover plate assembly and button cell

Abstract

The utility model relates to the technical field of batteries, in particular to a cover plate assembly and a button battery. The cover plate assembly comprises a first polar plate, a first insulating layer, an isolation plate, a second insulating layer and a second polar plate. According to the cover plate assembly disclosed by the utility model, the isolation plate is arranged between the first polar plate and the second polar plate, so that the composite strength of the cover plate assembly is enhanced, and the cover plate assembly is prevented from cracking and deforming. The first insulating layer is arranged between the isolation plate and the first polar plate, and the second insulating layer is arranged between the isolation plate and the second polar plate, so that the distance between the first polar plate and the second polar plate is increased, short circuit caused by too close distance between the first polar plate and the second polar plate is effectively avoided, and the reliability and the safety of the battery are improved.

Description

Technical Field

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

[0002] The cover assembly of the steel shell button battery is an important component of the battery. The cover assembly is located at one end of the battery and is used to close the battery cell and connect the positive and negative poles of the battery cell to the external circuit.

[0003] The cover plate assembly in the prior art includes an insulating layer and a positive plate and a negative plate arranged on both sides of the insulating layer. The insulating layer, the positive plate and the negative plate are hot-pressed and composited to form a cover plate. The disadvantage of this cover plate assembly is that the composite strength is low and the distance between the positive plate and the negative plate is too close, which can easily cause a short circuit. Utility Model Content

[0004] The technical problem to be solved by the embodiments of the utility model is to provide a cover plate assembly and a button battery to solve the problem that the cover plate of the steel shell button battery in the prior art has low composite strength and is prone to short circuit.

[0005] The cover plate assembly provided by the embodiment of the utility model includes: a first electrode plate, which is used to be electrically connected to the shell of the button battery; a first insulating layer, which is installed on the first electrode plate; an isolation plate, which is installed on the first insulating layer to be spaced apart from the first electrode plate; a second insulating layer, which is installed on the isolation plate; a second electrode plate, which is installed on the second insulating layer to be spaced apart from the isolation plate; wherein a first through hole is provided on the first electrode plate to expose the isolation plate, and a second through hole is provided on the isolation plate to expose the second electrode plate.

[0006] Optionally, the isolation plate includes an outer ring portion and an inner ring portion connected to the inner side of the outer ring portion, the outer ring portion is arranged on the top of the first electrode plate, the first insulating layer is arranged between the outer ring portion and the first electrode plate, the inner ring portion extends toward the first through hole and passes through the first through hole to form an installation groove above the inner ring portion, and the second insulating layer is installed in the installation groove.

[0007] Optionally, the second electrode plate is installed in the mounting groove.

[0008] Optionally, the thickness of the second electrode plate plus the thickness of the second insulating layer is equal to the depth of the mounting groove.

[0009] Optionally, the depth of the mounting groove is greater than or equal to 0.015 mm and less than or equal to 0.03 mm.

[0010] Optionally, the first insulating layer is annular, and the first through hole is connected to the central hole of the first insulating layer; and / or the second insulating layer is annular, and the second through hole is connected to the central hole of the second insulating layer.

[0011] Optionally, the thickness of the first insulating layer and / or the second insulating layer is greater than or equal to 0.05 mm and less than or equal to 0.2 mm.

[0012] Optionally, the thickness of the outer ring portion and the inner ring portion are both greater than or equal to 0.05 mm and less than or equal to 0.2 mm.

[0013] Optionally, the thickness of the first electrode plate and the second electrode plate are both greater than or equal to 0.05 mm and less than or equal to 0.2 mm.

[0014] The utility model also discloses a button battery, comprising the cover plate assembly as mentioned above.

[0015] Compared with the prior art, the beneficial effect of the cover plate assembly implemented by the utility model is that: the cover plate assembly includes a first plate, a first insulating layer, a separator, a second insulating layer and a second plate, the first plate is electrically connected to the shell of the button battery; the first insulating layer is mounted on the first plate; the separator is mounted on the first insulating layer to be spaced apart from the first plate; the second insulating layer is mounted on the separator; the second plate is mounted on the second insulating layer to be spaced apart from the separator; wherein, the first plate is provided with a first through hole to expose the separator, and the separator is provided with a second through hole to expose the second plate. The cover plate assembly of the utility model is provided with a separator between the first plate and the second plate, thereby enhancing the composite strength of the cover plate assembly and preventing the cover plate assembly from being broken and deformed. In addition, a first insulating layer is provided between the separator and the first plate, and a second insulating layer is provided between the separator and the second plate to increase the spacing between the first plate and the second plate, effectively avoiding a short circuit caused by the first plate and the second plate being too close, and improving the reliability and safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The specific implementation of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0017] Figure 1 A schematic cross-sectional view of an existing battery structure;

[0018] Figure 2 is a cross-sectional schematic diagram of a cover plate assembly provided in an embodiment of the utility model;

[0019] Figure 3 It is a cross-sectional schematic diagram of the isolation plate provided by the embodiment of the utility model;

[0020] Figure 4It is a cross-sectional schematic diagram of a button battery provided by an embodiment of the utility model;

[0021] Figure 5 It is a partial structural cross-sectional schematic diagram of a button battery provided in an embodiment of the utility model.

[0022] The reference numerals in the figures are:

[0023] 100. Button battery;

[0024] 1. Cover plate assembly; 11. First electrode plate; 111. First through hole; 12. First insulating layer; 13. Isolation plate; 131. Second through hole; 132. Outer ring; 133. Inner ring; 134. Mounting groove; 14. Second insulating layer; 15. Second electrode plate; 2. Shell; 21. Accommodating groove; 3. Battery cell; 31. First pole ear; 32. Second pole ear. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model is described in detail.

[0026] The utility model embodiment provides a cover plate assembly 1, such as Figures 2 to 5 As shown, the cover plate assembly 1 is applied to a button battery 100, and includes a first electrode plate 11, a first insulating layer 12, a separator 13, a second insulating layer 14 and a second electrode plate 15. The first electrode plate 11 is electrically connected to the shell 2 of the button battery 100; the first insulating layer 12 is mounted on the first electrode plate 11; the separator 13 is mounted on the first insulating layer 12 to be spaced apart from the first electrode plate 11; the second insulating layer 14 is mounted on the separator 13; the second electrode plate 15 is mounted on the second insulating layer 14 to be spaced apart from the separator 13; wherein, the first electrode plate 11 is provided with a first through hole 111 to expose the separator 13, and the separator 13 is provided with a second through hole 131 to expose the second electrode plate 15.

[0027] Specifically, the cover plate assembly 1 of the present invention is provided with a separator 13 between the first electrode plate 11 and the second electrode plate 15, and the separator 13 can enhance the composite strength of the first electrode plate 11 and the second electrode plate 15 to prevent the cover plate assembly 1 from being broken and deformed. In addition, a first insulating layer 12 is provided between the separator 13 and the first electrode plate 11, and a second insulating layer 14 is provided between the separator 13 and the second electrode plate 15 to increase the distance between the first electrode plate 11 and the second electrode plate 15, effectively avoiding a short circuit caused by the first electrode plate 11 and the second electrode plate 15 being too close, thereby improving the reliability and safety of the button battery 100.

[0028] In addition, if Figure 4As shown, when the cover assembly 1 is applied to the button battery 100, the first electrode plate 11 is electrically connected to the shell 2 of the button battery 100, and the first electrode plate 11 is provided with a first through hole 111 to expose the isolation plate 13, and the isolation plate 13 is provided with a second through hole 131 to expose the second electrode plate 15, so that the battery cell 3 can be electrically connected to the second electrode plate 15 by passing through the first through hole 111 and the second through hole 131 to form the internal circuit of the button battery 100, so that the button battery 100 can work normally.

[0029] It should be noted that the first insulating layer 12 and the second insulating layer 14 are hot melt adhesive layers, and the composite of the cover plate assembly 1 includes stacking the first electrode 11, the first insulating layer 12, the separator 13, the second insulating layer 14 and the second electrode 15 in order from bottom to top, and bonding the first electrode 11, the first insulating layer 12, the separator 13, the second insulating layer 14 and the second electrode 15 to form the cover plate assembly 1 by hot pressing. Of course, the order of hot pressing can also be to first hot press the first electrode 11, the first insulating layer 12 and the separator 13, and then hot press the second insulating layer 14 and the second electrode 15 with the separator 13; or first hot press the separator 13, the second insulating layer 14 and the second electrode 15, and then hot press the first electrode 11 and the first insulating layer 12 with the separator 13.

[0030] In a specific embodiment, the first electrode 11, the first insulating layer 12, the isolation plate 13, the second insulating layer 14 and the second electrode 15 are hot pressed to form the cover plate assembly 1, and the hot pressing temperature is greater than or equal to 120°C and less than or equal to 150°C; the hot pressing time is greater than or equal to 2 seconds and less than or equal to 8 seconds.

[0031] The hot pressing temperature is set within a range of greater than or equal to 120°C and less than or equal to 150°C. The reason is that this temperature range can promote the melting of the hot melt adhesive, and the hot melt adhesive at this hot pressing temperature has good fluidity, which helps the hot melt adhesive to fill the gaps between the first electrode 11 and the isolation plate 13 and between the isolation plate 13 and the second electrode 15, forming a more uniform first insulating layer 12 and the second insulating layer 14, thereby increasing the connection stability of the first electrode 11, the first insulating layer 12, the isolation plate 13, the second insulating layer 14 and the second electrode 15.

[0032] It is worth mentioning that if the hot pressing temperature is lower than 120°C, the melting and fluidity of the hot melt adhesive may be insufficient, and the gaps between the first electrode 11 and the separator 13 and between the separator 13 and the second electrode 15 cannot be well filled, resulting in poor connection stability of the first electrode 11, the first insulating layer 12, the separator 13, the second insulating layer 14 and the second electrode 15. If the hot pressing temperature is higher than 170°C, the hot melt adhesive may be excessively melted or thermally decomposed, which will also affect the performance of the first insulating layer 12 and the second insulating layer 14 formed by it. Therefore, in this embodiment, the hot pressing temperature is set within a range of greater than or equal to 130°C and less than or equal to 150°C.

[0033] The hot pressing time is set within a range of greater than or equal to 2 seconds and less than or equal to 8 seconds. The reason is that the hot pressing time combined with the above-mentioned hot pressing temperature is sufficient to ensure that the hot melt adhesive is fully melted and flowed during the hot pressing process, thereby achieving good bonding of the first electrode 11, the first insulating layer 12, the isolation plate 13, the second insulating layer 14 and the second electrode 15.

[0034] It is worth mentioning that if the hot pressing time is greater than 8 seconds, the hot melt adhesive may be over-melted, thereby affecting the performance of the hot melt adhesive layer. In addition, too long a hot pressing time may also affect production efficiency, thereby leading to higher production costs. If the hot pressing time is less than 2 seconds, the hot melt adhesive will not have enough time to fully melt and flow, thereby affecting the pasting quality. Therefore, in this embodiment, the hot pressing time is set within a range of greater than or equal to 2 seconds and less than or equal to 8 seconds.

[0035] In order to make the technical personnel in this field better understand the present utility model scheme, the following will be combined with the attached Figures 1 to 5 , clearly and completely describe the technical solutions in the embodiments of the utility model.

[0036] Further, as a specific implementation in some embodiments of the present utility model, Figures 2 to 5 As shown, the isolation plate 13 includes an outer ring portion 132 and an inner ring portion 133 connected to the inner side of the outer ring portion 132, the outer ring portion 132 is arranged on the top of the first electrode 11, the first insulating layer 12 is located between the outer ring portion 132 and the first electrode 11, the inner ring portion 133 extends toward the first through hole 111 to penetrate the first through hole 111, so as to form a mounting groove 134 above the inner ring portion 133, and the second insulating layer 14 is installed in the mounting groove 134.

[0037] Specifically, the inner ring portion 133 of the isolation plate 13 is connected to the inner side of the outer ring portion 132, and the inner ring portion 133 extends toward the first through hole 111 to penetrate the first through hole 111, so that a mounting groove 134 can be formed above the inner ring portion 133, so that the top of the first electrode plate 11 and the first insulating layer 12 can be installed on the outer ring portion 132, and the second insulating layer 14 can be installed in the mounting groove 134 of the inner ring portion 133. Thus, while ensuring the composite strength of the cover plate assembly 1, the thickness of the isolation plate 13 can be reduced, thereby reducing the overall thickness of the cover plate assembly 1, which is conducive to increasing the capacity of the battery cell 3 inside the button battery 100.

[0038] Further, as a specific implementation in some embodiments of the present utility model, Figures 2 to 4 As shown, the second electrode plate 15 is installed in the installation groove 134. Specifically, the second electrode plate 15 is installed in the installation groove 134, thereby, compared with only the second insulating layer being installed in the groove, the thickness of the cover assembly can be further reduced, and the capacity of the battery cell 3 inside the button battery 100 can be increased.

[0039] Further, as a specific implementation in some embodiments of the present utility model, Figures 2 to 4 As shown, the thickness of the second electrode plate 15 plus the thickness of the second insulating layer 14 is equal to the depth of the mounting groove 134 .

[0040] Specifically, the thickness of the second electrode plate 15 plus the thickness of the second insulating layer 14 is equal to the depth of the mounting groove 134. Thus, the upper end surface of the second electrode plate 15 can be flush with the upper end surface of the outer ring portion 132 of the isolation plate 13, so that the upper end surface of the cap plate assembly 1 is flush, and when the cap plate assembly 1 is assembled on the button battery 100, it can effectively prevent the battery head from protruding, further reduce the thickness of the cap plate assembly, and increase the capacity of the battery cell 3.

[0041] Further, as a specific implementation in some embodiments of the present utility model, Figures 2 to 4 As shown, the depth of the mounting groove 134 is greater than or equal to 0.015 mm and less than or equal to 0.03 mm. This depth can ensure that the second electrode 15 and the second insulating layer 14 can be stably installed in the mounting groove 134, while preventing the thickness of the isolation plate 13 from being too large, thereby affecting the overall thickness of the cover plate assembly 1.

[0042] As a specific implementation in some embodiments of the present utility model, Figures 2 to 4 As shown, the first insulating layer 12 is annular, and the first through hole 111 is connected to the central hole of the first insulating layer 12 ; and / or, the second insulating layer 14 is annular, and the second through hole 131 is connected to the central hole of the second insulating layer 14 .

[0043] Specifically, the first insulating layer 12 is annular, the first through hole 111 is connected to the central hole of the first insulating layer 12, the second insulating layer 14 is annular, and the second through hole 131 is connected to the central hole of the second insulating layer 14, so that the first through hole 111 can be connected to the lower end surface of the second electrode plate 15, so as to connect the electrode of the battery cell 3 in the button battery 100 to the lower end surface of the second electrode plate 15. In addition, the annular first insulating layer 12 can increase the connection area with the first electrode plate 11 and the outer ring portion 132, thereby increasing the composite strength of the first insulating layer 12 with the first electrode plate 11 and the outer ring portion 132. The annular second insulating layer 14 can increase the connection area with the second electrode plate 15 and the inner ring portion 133, thereby increasing the composite strength of the second insulating layer 14 with the second electrode plate 15 and the inner ring portion 133.

[0044] As a specific implementation in some embodiments of the present utility model, Figures 2 to 4 As shown, the thickness of the first insulating layer 12 and / or the second insulating layer 14 is greater than or equal to 0.05 mm and less than or equal to 0.2 mm. The first insulating layer 12 and the second insulating layer 14 of this thickness can ensure good bonding and isolation effects between the first electrode 11, the separator 13 and the second electrode 15 without taking up too much space.

[0045] As a specific implementation in some embodiments of the present utility model, Figures 2 to 4 As shown, the thickness of the outer ring portion 132 and the inner ring portion 133 are both greater than or equal to 0.05 mm and less than or equal to 0.2 mm. Thus, the thickness of the outer ring portion 132 and the inner ring portion 133 of the isolation plate 13 can be made the same, simplifying the manufacturing process of the isolation plate 13. Moreover, the outer ring portion 132 and the inner ring portion 133 of this thickness can ensure that they have sufficient strength while maintaining a suitable thickness of the overall structure of the isolation plate 13.

[0046] As a specific implementation in some embodiments of the present utility model, Figures 2 to 5 As shown, the thickness of the first electrode plate 11 and the second electrode plate 15 are both greater than or equal to 0.05 mm and less than or equal to 0.2 mm. The first electrode plate 11 and the second electrode plate 15 of this thickness have sufficient strength and low internal resistance, so that the energy output rate of the button battery 100 is high.

[0047] like Figure 4 and Figure 5 As shown, the utility model further discloses a button battery 100, and the button battery 100 includes the cover plate assembly 1 as described above.

[0048] Specifically, Figure 4 and Figure 5As shown, the button battery 100 further includes a housing 2 and a battery cell 3, the housing 2 is provided with a receiving groove 21, the battery cell 3 is provided in the receiving groove 21, the battery cell 3 includes a first pole ear 31 and a second pole ear 32, and the cover assembly 1 is blocked at the notch of the receiving groove 21. Among them, the first pole plate 11 is electrically connected to the housing 2, the first pole ear 31 is electrically connected to the first pole plate 11 or the housing 2, and the second pole ear 32 passes through the first through hole 111, the second through hole 131, the first insulating layer 12, and the center hole of the second insulating layer 14 to be electrically connected to the first pole plate 11, so as to form a circuit of the button battery 100, so that the battery can work normally.

[0049] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present utility model.

Claims

1. A cover plate assembly, applied to a button battery, characterized in that: include: A first electrode plate, which is used to be electrically connected to the housing of the button battery; A first insulating layer, which is mounted on the first electrode plate; A separator, which is mounted on the first insulating layer to be spaced apart from the first electrode plate; A second insulating layer, which is mounted on the isolation plate; A second electrode plate is mounted on the second insulating layer to be spaced apart from the isolation plate; The first electrode plate is provided with a first through hole to expose the isolation plate, and the isolation plate is provided with a second through hole to expose the second electrode plate.

2. The cover plate assembly according to claim 1, characterized in that: The isolation plate includes an outer ring portion and an inner ring portion connected to the inner side of the outer ring portion, the outer ring portion is arranged on the top of the first electrode plate, the first insulating layer is arranged between the outer ring portion and the first electrode plate, the inner ring portion extends toward the first through hole and passes through the first through hole to form an installation groove above the inner ring portion, and the second insulating layer is installed in the installation groove.

3. The cover plate assembly according to claim 2, characterized in that: The second electrode plate is installed in the installation groove.

4. The cover plate assembly according to claim 3, characterized in that: The thickness of the second electrode plate plus the thickness of the second insulating layer is equal to the depth of the mounting groove.

5. The cover plate assembly according to claim 4, characterized in that: The depth of the mounting groove is greater than or equal to 0.015 mm and less than or equal to 0.03 mm.

6. The cover plate assembly according to claim 1, characterized in that: The first insulating layer is annular in shape, and the first through hole is connected to the central hole of the first insulating layer; and / or the second insulating layer is annular in shape, and the second through hole is connected to the central hole of the second insulating layer.

7. The cover plate assembly according to any one of claims 1 to 6, characterized in that: The thickness of the first insulating layer and / or the second insulating layer is greater than or equal to 0.05 mm and less than or equal to 0.2 mm.

8. The cover plate assembly according to any one of claims 2 to 5, characterized in that: The thickness of the outer ring portion and the inner ring portion are both greater than or equal to 0.05 mm and less than or equal to 0.2 mm.

9. The cover plate assembly according to any one of claims 1 to 6, characterized in that: The thickness of the first electrode plate and the second electrode plate are both greater than or equal to 0.05 mm and less than or equal to 0.2 mm.

10. A button battery, characterized in that: The cover plate assembly comprises any one of claims 1 to 9.

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