Button cell

Abstract

The utility model relates to the technical field of button cells, in particular to a button cell and a pole piece. Comprising a shell, a cover plate assembly and a roll core, the cover plate assembly is mounted at the mounting groove, and the bottom of the cover plate assembly is located in the mounting groove; the roll core is installed in the installation groove, and the top of the roll core is provided with a concave part to avoid the bottom. Specifically, the area where the roll core and the bottom are arranged in a staggered mode is higher than the area where the roll core and the bottom directly face, so that a concave portion is formed, and the area where the roll core and the concave portion are arranged in a staggered mode is higher than the prior art under the condition that the bottom of the cover plate assembly occupies part of space of the installation groove. Therefore, the occupancy rate of the remaining space between the roll core and the cover plate assembly can be increased, the overall occupied volume of the roll core is increased in a limited space, the capacity of the roll core is increased, and the effect of increasing the ED value of the roll core is achieved.

Description

Technical Field

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

[0002] In the field of button batteries, "ED value" usually refers to the energy density of the battery. Energy density refers to the ratio between the energy stored in a button battery and its mass or volume. For rechargeable batteries or disposable batteries, energy density is an important performance indicator that determines the capacity and service life of the battery. A higher energy density means that the battery can store more energy, thus providing a longer service life at the same volume or weight.

[0003] There are many types of button batteries on the market. One type of button battery includes a housing with a mounting slot, a cover assembly, and a winding core. The cover assembly includes an end cap and a pole. The end cap is mounted in the mounting slot. The pole is embedded in the end cap and electrically connected to the winding core. In this structure, one end of the pole will penetrate the end cap and be accommodated in the mounting slot to improve the connection stability between the pole and the winding core.

[0004] However, in the above structure, since one end of the pole occupies the internal space of the installation slot, the installation space of the winding core is further compressed, so that the winding core is small in size, low in capacity, and the ED value is reduced. Utility Model Content

[0005] The technical problem to be solved by the embodiment of the utility model is to provide a button battery to solve the problem in the prior art that the installation space of the winding core is compressed, resulting in a small winding core volume, low capacity, and a decreased ED value.

[0006] In a first aspect, a button battery provided by an embodiment of the utility model comprises:

[0007] A housing having a mounting slot;

[0008] A cover plate assembly is installed at the mounting groove, and the bottom of the cover plate assembly is located in the mounting groove;

[0009] The winding core is installed in the installation groove, and a recessed portion is provided on the top of the winding core to avoid the bottom.

[0010] Optionally, the winding core includes two pole pieces, the pole piece includes an inner ring segment and an outer ring segment, and in the direction from the bottom of the mounting groove toward the notch of the mounting groove, the inner ring segment is arranged corresponding to the bottom; the inner ring segment includes a first long side arranged toward the bottom, and a second long side arranged away from the bottom;

[0011] When the pole piece is in the unfolded state, the inner ring segment and the outer ring segment both extend along a first direction, the first long side extends along the first direction, and the second long side is set at an angle with the first direction so that in the direction in which the inner ring segment moves away from the outer ring segment, the distance between the first long side and the second long side gradually decreases.

[0012] Optionally, the cover plate assembly includes an end cover, a pole and an insulating layer, the end cover is covered in a notch of the mounting groove, the pole is embedded in the end cover, the bottom is located on the pole, the insulating layer is arranged between the end cover and the pole, the length of the pole in a direction perpendicular to the bottom of the mounting groove is greater than or equal to 1.5 mm and less than or equal to 3 mm, and the diameter of the pole is greater than or equal to 0.8 mm and less than or equal to 1.5 mm.

[0013] Optionally, the end cover is provided with a through hole for embedding the pole, the pole includes a peripheral wall facing the hole wall of the through hole, the peripheral wall is provided with a groove, and the hole wall is embedded in the groove.

[0014] Optionally, the embedding length of the through hole wall is greater than or equal to 0.5 mm and less than or equal to 2.5 mm.

[0015] Optionally, the longest distance between the first long side and the second long side, minus the shortest distance between the first long side and the second long side, is equal to the distance between the bottom and the end cover.

[0016] Optionally, the distance between the bottom and the end cover is greater than or equal to 0.3 mm and less than or equal to 0.7 mm.

[0017] Optionally, explosion-proof patterns are provided on the bottom wall of the shell.

[0018] In the second aspect, an embodiment of the utility model provides a pole piece, comprising an inner ring segment and an outer ring segment both extending along a first direction, wherein the inner ring segment comprises a first long side and a second long side; the first long side extends along the first direction, and the second long side is set at an angle with the first direction so that in the direction in which the inner ring segment moves away from the outer ring segment, the distance between the first long side and the second long side gradually decreases, thereby forming a recessed portion at the top of the manufactured winding core.

[0019] In a third aspect, an embodiment of the utility model provides a pole piece, comprising an inner ring segment and an outer ring segment both extending along a first direction, wherein the overall height of the inner ring segment is smaller than that of the outer ring segment, so that a recessed portion is formed on the top of the manufactured winding core.

[0020] Compared with the prior art, the beneficial effects of a button battery and an electrode provided by an embodiment of the utility model are that the area where the core is offset from the bottom is higher than the area directly opposite to the bottom, so a recessed portion is formed. When the bottom of the cover assembly occupies part of the space of the installation groove, the area where the core is offset from the recessed portion is higher than that of the prior art, so the occupancy rate of the remaining space between the core and the cover assembly can be increased, and the overall occupied volume of the core is increased in a limited space, thereby increasing the capacity of the core and achieving the effect of increasing the ED value of the core. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specific implementation of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0022] Figure 1 is a cross-sectional view of a button battery provided by an embodiment of the utility model;

[0023] Figure 2 The plane of the pole piece provided in the embodiment of the utility model is unfolded Figure 1 ;

[0024] Figure 3 is a cross-sectional view of a pole provided by an embodiment of the utility model;

[0025] Figure 4 It is a schematic diagram of the internal combination of the end cover, the pole and the winding core provided by the embodiment of the utility model;

[0026] Figure 5 The plane of the pole piece provided in the embodiment of the utility model is unfolded Figure 2 .

[0027] The reference numerals in the figures are:

[0028] 1000, button battery;

[0029] 100, housing; 110, mounting slot;

[0030] 200, cover plate assembly; 210, bottom; 220, end cover; 221, through hole; 230, pole; 231, peripheral wall; 231a, groove; 240, insulating layer;

[0031] 300, winding core; 310, recessed portion; 320, pole piece; 321, inner ring segment; 322, outer ring segment; 323, first long side; 324, second long side. DETAILED DESCRIPTION

[0032] 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.

[0033] The present utility model embodiment provides a button battery 1000, such as Figure 1 to Figure 2 As shown, the button battery 1000 includes a shell 100, a cover assembly 200 and a winding core 300. The shell 100 is provided with a mounting groove 110; the cover assembly 200 is installed at the mounting groove 110, and the bottom 210 of the cover assembly 200 is located in the mounting groove 110; the winding core 300 is installed in the mounting groove 110, and a recessed portion 310 is provided on the top of the winding core 300 to avoid the bottom 210. Specifically, the area where the core 300 and the bottom 210 are offset is higher than the area directly facing the core 300 and the bottom 210, so a recessed portion 310 is formed. When the bottom 210 of the cover assembly 200 occupies part of the space of the mounting groove 110, the area where the core 300 and the recessed portion 310 are offset is higher than that of the prior art, so the occupancy rate of the remaining space between the core 300 and the cover assembly 200 can be increased, and the overall occupied volume of the core 300 is increased in a limited space, so the capacity of the core 300 is increased, thereby achieving the effect of increasing the ED value of the core 300.

[0034] It should be noted that in the field of button batteries, "ED value" usually refers to the energy density (EnergyDensity) of the battery. Energy density refers to the ratio between the energy stored in a button battery and its mass or volume. For rechargeable batteries or disposable batteries, energy density is an important performance indicator, which determines the capacity and service life of the battery. A higher energy density means that the battery can store more energy, thereby providing a longer service life at the same volume or weight. Therefore, by implementing the above scheme, the overall occupied volume of the core 300 in the mounting groove 110 can be increased, thereby increasing the capacity of the core 300 and achieving the effect of increasing the ED value of the core 300.

[0035] In one embodiment, the winding core 300 includes two pole pieces 320, and the pole piece 320 includes an inner ring segment 321 and an outer ring segment 322. In the direction from the groove bottom to the groove opening, the inner ring segment 321 is arranged corresponding to the bottom 210; the inner ring segment 321 includes a first long side 323 arranged toward the bottom 210 and a second long side 324 arranged away from the bottom 210;

[0036] In the unfolded state of the pole piece 320, the inner ring segment 321 and the outer ring segment 322 are both along the first direction (such as Figure 2 The first long side 323 is arranged along the first direction, and the second long side 324 is arranged at an angle to the first direction, so that in the direction in which the inner circle segment 321 is away from the outer circle segment 322, the distance between the first long side 323 and the second long side 324 gradually decreases.

[0037] The two pole pieces 320 are respectively a positive pole piece and a negative pole piece. The positive pole piece and the negative pole piece are wound and installed in the mounting groove 110, and are sealed by the cover assembly 200. The sealed positive pole piece 320 and the negative pole piece 320 are electrically connected to the bottom 210 of the cover assembly 200 and the housing 100 respectively. The electrical connection can be achieved by laser, resistance, ultrasonic welding, etc., connecting the positive pole piece 320 to the pole 230 and the negative pole piece 320 to the housing 100, thereby realizing the power supply function of the button battery 1000. Specifically, when the pole piece 320 is wound, Afterwards, a winding core 300 with a high outer ring segment 322 and a low inner ring segment 321 (i.e., high on the outside and low on the center) will be formed, that is, the inner ring segments 321 of the two pole pieces 320 jointly define a recessed portion 310 of the winding core 300 after winding. When the bottom 210 occupies part of the space between the winding core 300 and the end cover 220, the outer ring segment 322 can increase the occupancy rate of the remaining space between the winding core 300 and the end cover 220, thereby increasing the overall occupied volume of the winding core 300 in a limited space, improving the capacity of the winding core 300, and achieving the effect of increasing the ED value of the winding core 300.

[0038] In one embodiment, the cover plate assembly 200 includes an end cap 220, a pole 230 and an insulating layer 240. The end cap 220 is covered in the notch of the mounting groove 110, the pole 230 is embedded in the end cap 220, the bottom 210 is located on the pole 230, and the insulating layer 240 is arranged between the end cap 220 and the pole 230. Specifically, the insulating layer 240 insulates the end cap 220 from the pole 230, and further insulates the outer shell 100 from the pole 230, thereby preventing the positive electrode 320 from short-circuiting with the negative electrode 320, thereby improving the safety of use. One end of the pole 230 (i.e., the bottom 210) is located in the mounting groove 110, and the other end of the pole 230 is exposed outside the outer shell 100; such a configuration of the pole can improve the connection stability with the end cap 220. More specifically, the length of the pole 230 in a direction perpendicular to the bottom of the mounting groove 110, i.e., the height of the pole 230 (e.g., Figure 3 ) is greater than or equal to 1.5 mm and less than or equal to 3 mm, and the diameter of the pole 230 (as shown in γ in Figure 3 (as shown in β in FIG. 1 ) is greater than or equal to 0.8 mm and less than or equal to 1.5 mm. For example, the height of the pole 230 is set to 2 mm, and the diameter of the pole 230 is set to 1 mm. The size of the pole 230 has an important influence on the performance stability of the battery. By implementing this embodiment, controlling the size of the pole 230 can ensure smooth current transmission between the positive and negative electrodes of the battery and other components. The appropriate size can reduce resistance and improve the conductivity of the button battery 1000, thereby maintaining the stability and consistency of the button battery 1000, ensuring good contact between the pole 230 and other components, and reducing contact resistance and heat accumulation. This helps to reduce the risk of heating, overheating and short circuiting of the button battery 1000, and improve the safety performance of the button battery 1000.

[0039] The insulating layer 240 in the above embodiment is a composite adhesive layer, so that the insulating layer 240 can be used to connect the pole 230 and the end cover 220 , and can also be used to insulate the pole 230 and the end cover 220 .

[0040] Reference Figure 1 , Figure 3 and Figure 4 In one embodiment, the end cover 220 is provided with a through hole 221 for the pole 230 to be embedded, and the pole 230 includes a peripheral wall 231 facing the hole wall of the through hole 221, and the peripheral wall 231 is provided with a groove 231a, and the hole wall of the through hole 221 is embedded in the groove 231a. Such a configuration further improves the stability and reliability of the connection between the pole 230 and the end cover 220.

[0041] Specifically, the groove 231a is arranged around the peripheral wall 231, and the hole wall of the through hole 221 is embedded in the groove 231a. The groove wall of the groove 231a cooperates with the two side end walls connected to the through hole 221 to limit the pole 230 in the second direction (such as Figure 1 The bottom wall of the groove 231a cooperates with the hole wall of the through hole 221 to limit the radial movement of the pole 230, thereby completely limiting the position of the pole 230 and ensuring the reliability of the connection between the pole 230 and the end cover 220. The reliability of the connection between the two is improved, which also means that the safety performance of the button battery 1000 is further enhanced.

[0042] The shape of the groove 231 a matches the hole wall of the through hole 221 , and the groove 231 a may be square, trapezoidal or triangular, which is not limited here.

[0043] The through hole 221 may be disposed at the center of the end cover 220 , so as to facilitate packaging of the housing 100 and the cover assembly 200 after baking and liquid injection, thereby completing the production of the button battery 1000 .

[0044] It should be noted that the insulating layer 240 can be embedded in the groove 231a to ensure insulation between the pole 230 and the end cover 220, thereby improving the safety performance of the button battery 1000. Specifically, the insulating layer 240 can be a composite adhesive layer and embedded in and cover the groove wall of the groove 231a. Preferably, the composite adhesive layer can overflow the notch of the groove 231a to improve the insulation effect.

[0045] In addition, the arrangement of the pole 230 embedded in the composite adhesive layer can ensure the sealing performance of the cover assembly 200 itself. Good sealing performance can reduce the possibility of foreign matter entering the interior of the button battery 1000, extend the life of the battery, and avoid leakage of internal substances of the button battery 1000.

[0046] Reference Figure 4 In one embodiment, the embedding length of the through hole 221 wall (eg Figure 4(shown as ε in ) is greater than or equal to 0.5 mm and less than or equal to 2.5 mm. For example, the embedding length is set to 1 mm or 1.5 mm. In this way, while ensuring the connection stability between the pole 230 and the end cover 220, the strength of the pole 230 itself can be ensured, and the groove 231a is too shallow to cause the connection to shake or the groove 231a is too deep to reduce the internal strength of the pole 230.

[0047] Reference Figure 4 In one embodiment, the longest distance between the first long side 323 and the second long side 324 is equal to the shortest distance between the first long side 323 and the second long side 324 (e.g. Figure 4 α in the figure) is equal to the distance between the bottom 210 and the end cap 220. This arrangement ensures that the space of the mounting slot is fully utilized by the winding core 300, improves the capacity of the winding core 300, and increases the ED value of the winding core 300. Specifically, the distance between the two is equal, which ensures that after the pole piece 320 is wound into the winding core 300 and accommodated in the mounting slot 110, there is space to be welded and connected with the pole 230 to achieve conduction.

[0048] In a more specific embodiment, the distance between the bottom 210 and the end cap 220 (eg Figure 4 (shown as δ in ) is greater than or equal to 0.3 mm and less than or equal to 0.7 mm. For example, the distance between the bottom 210 and the end cover 220 is set to 0.5 mm. In this way, the core 300 can better utilize the space of the mounting groove 110 while ensuring that there is space for welding the core 300 and the pole 230. Therefore, the core 300 of this embodiment has a larger capacity.

[0049] In one embodiment, the bottom of the housing 100 is further provided with an explosion-proof pattern (not shown in the figure). The explosion-proof pattern facilitates the release of internal pressure of the button battery 1000 and improves the safety of the button battery 1000. Specifically, when an abnormal situation occurs inside the button battery 1000, such as overcharging, overdischarging, short circuit, etc., a large amount of heat and gas will be generated, resulting in an increase in the internal pressure of the button battery 1000. The design of the explosion-proof pattern can release the pressure by breaking or opening when the internal pressure reaches a certain level, thereby preventing the button battery 1000 from exploding due to excessive pressure.

[0050] Reference Figure 2, the embodiment of the utility model also provides a pole piece 320, and the pole piece 320 has two implementation modes. In the first embodiment, the pole piece 320 includes an inner ring segment 321 and an outer ring segment 322 both extending along the first direction, and the inner ring segment 321 includes a first long side 323 and a second long side 324; the first long side 323 extends along the first direction, and the second long side 324 is set at an angle with the first direction, so that in the direction where the inner ring segment 321 is away from the outer ring segment 322, the distance between the first long side 323 and the second long side 324 gradually decreases, thereby forming a recessed portion 310 on the top of the manufactured winding core 300. Specifically, after the pole piece 320 is manufactured into a winding core, the inner ring segment 321 is located in the central circle layer of the winding core 300, and the outer ring segment 322 is located in the outer circle layer of the winding core 300. The pole piece 320 can be die-cut into the desired shape by using a laser die-cutting process. Laser die-cutting is easy to process and manufacture. The pole piece 320 is die-cut into a pole piece 320 with a gradient width by laser die-cutting. After winding, it can form a winding core 300 with a high outside and a low middle, so as to improve the space occupancy rate. The first long side extends along the first direction, which can further improve the occupancy rate of the inner ring segment 321 to the remaining space to increase the capacity of the winding core 300. The second long side 324 extends and gradually approaches the first long side 323. The first long side 323 extends and remains unchanged in the first direction. After the pole piece 320 is wound, the inner ring segment 321 will be concave on the side facing the pole 230, avoiding the inner end wall 222 of the pole 230 and being as close to it as possible, thereby improving the space occupancy rate of the overall inner ring segment 321 in the mounting groove 110, and improving the capacity of the winding core 300, so as to achieve the purpose of improving the ED value.

[0051] Reference Figure 5 In the second embodiment, the pole piece 320 includes an inner ring segment 321 and an outer ring segment 322 both extending along the first direction, and the overall height of the inner ring segment 321 (eg Figure 5 ) is smaller than the height of the outer ring segment 322 (as shown in H1 in FIG. Figure 5 As shown in H2 in the figure, a concave portion 310 is formed on the top of the manufactured winding core 300. With such a configuration, after the pole piece 320 is wound, the inner ring segment 321 facing the pole 230 may be concave to avoid the bottom of the pole 230. The outer ring segment 322 is higher than the inner ring segment 321, thereby increasing the occupied space, thereby increasing the space occupancy rate of the entire winding core in the installation groove 110, thereby increasing the capacity of the winding core 300, and achieving the purpose of increasing the ED value.

[0052] 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 button battery, It is characterized in that include: A housing having a mounting slot; A cover plate assembly is installed at the mounting groove, and the bottom of the cover plate assembly is located in the mounting groove; The winding core is installed in the installation groove, and a recessed portion is provided on the top of the winding core to avoid the bottom.

2. The button battery according to claim 1, It is characterized in that The winding core includes two pole pieces, the pole pieces include an inner ring segment and an outer ring segment, in the direction from the bottom of the mounting groove toward the groove opening of the mounting groove, the inner ring segment is arranged corresponding to the bottom; the inner ring segment includes a first long side arranged toward the bottom, and a second long side arranged away from the bottom; When the pole piece is in the unfolded state, the inner ring segment and the outer ring segment both extend along a first direction, the first long side extends along the first direction, and the second long side is set at an angle with the first direction so that in the direction in which the inner ring segment moves away from the outer ring segment, the distance between the first long side and the second long side gradually decreases.

3. The button battery according to claim 2, It is characterized in that The cover plate assembly includes an end cover, a pole and an insulating layer, the end cover is covered on the notch of the mounting groove, the pole is embedded in the end cover, the bottom is located on the pole, the insulating layer is arranged between the end cover and the pole, the length of the pole in the direction perpendicular to the bottom of the mounting groove is greater than or equal to 1.5 mm and less than or equal to 3 mm, and the diameter of the pole is greater than or equal to 0.8 mm and less than or equal to 1.5 mm.

4. The button battery according to claim 3, It is characterized in that The end cover is provided with a through hole for embedding the pole, the pole comprises a peripheral wall facing the hole wall of the through hole, the peripheral wall is provided with a groove, and the hole wall of the through hole is embedded in the groove.

5. The button battery according to claim 4, It is characterized in that The embedding length of the through hole wall is greater than or equal to 0.5 mm and less than or equal to 2.5 mm.

6. The button battery according to claim 4, It is characterized in that The longest distance between the first long side and the second long side, minus the shortest distance between the first long side and the second long side, is equal to the distance between the bottom and the end cover.

7. The button battery according to claim 6, It is characterized in that The distance between the bottom and the end cover is greater than or equal to 0.3 mm and less than or equal to 0.7 mm.

8. The button battery according to any one of claims 1 to 7, It is characterized in that The bottom wall of the shell is provided with explosion-proof patterns.

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