CN212380474U - Soft package button cell - Google Patents

Abstract

The utility model provides a soft package button battery, which comprises a winding core, an aluminum-plastic composite membrane shell and an inner support structure; the winding core and the inner support structure are packaged in the aluminum-plastic composite film shell, and the winding core is formed by winding a positive plate, a diaphragm and a negative plate; a positive lug is led out of the positive plate and penetrates out of the aluminum-plastic composite membrane shell; a negative electrode lug is led out of the negative electrode piece and penetrates out of the aluminum-plastic composite membrane shell; the axis of the winding core is provided with a through hole which penetrates through two end faces of the winding core; the inner supporting structure comprises a first supporting plate, a second supporting plate and supporting columns, the first supporting plate and the second supporting plate are respectively located outside two end faces of the winding core, the supporting columns penetrate through the through holes, and two ends of the supporting columns are respectively fixedly connected with the first supporting plate and the second supporting plate. Compared with the prior art, the inner supporting structure can protect the two end faces of the winding core, and the internal short circuit of the soft package button battery is avoided.

Description

Soft package button cell

Technical Field

The utility model belongs to the technical field of laminate polymer battery, especially, relate to a laminate polymer button cell.

Background

Pouch cells are cells that employ a polymer, typically an aluminum plastic film, as a housing. Compared with a hard-shell battery, the soft-package battery mainly has the following advantages:

(1) the safety is good, and laminate polymer battery adopts the plastic-aluminum membrane packing structurally, and when taking place thermal management out of control or puncture, the plastic-aluminum membrane shell can provide buffer space for electric core, takes place the bulging deformation, and only can catch fire or smoke finally, nevertheless can not explode.

(2) Light weight, high energy density: soft-pouch cells weigh 40% less than steel-can cells of equivalent capacity and 20% less than aluminum-can cells, and therefore generally have higher energy densities.

(3) Good electrochemical performance and long service life: the internal resistance of the soft package battery is small, the self-consumption of the battery can be greatly reduced, and the cycle life of the soft package battery is longer.

Soft pouch button cells are a form of soft pouch cells. The existing soft-package button battery comprises a winding core and an aluminum-plastic composite film shell coated outside the winding core, and if the end face of the soft-package button battery is extruded, the pole piece of the winding core can be damaged and fall powder, so that the internal short circuit of the battery is caused. Therefore, the end face of the soft package button battery cannot bear force, and the internal short circuit of the battery is easily caused.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the soft-package button battery is provided aiming at the problem that the end face of the existing soft-package button battery cannot be stressed when being extruded, and the internal short circuit of the battery is easily caused.

In order to solve the technical problem, an embodiment of the utility model provides a soft-packaged button battery, which comprises a winding core, an aluminum-plastic composite film shell and an inner supporting structure; the winding core and the inner support structure are packaged in the aluminum-plastic composite film shell, and the winding core is formed by winding a positive plate, a diaphragm and a negative plate; a positive lug is led out of the positive plate and penetrates out of the aluminum-plastic composite membrane shell; a negative electrode lug is led out of the negative electrode piece and penetrates out of the aluminum-plastic composite membrane shell;

a through hole penetrating through two end faces of the winding core is formed in the axis of the winding core; the inner supporting structure comprises a first supporting plate, a second supporting plate and a supporting column, the first supporting plate and the second supporting plate are respectively located outside two end faces of the winding core, the supporting column penetrates through the through hole, and two ends of the supporting column are respectively fixedly connected with the first supporting plate and the second supporting plate.

Optionally, the two end surfaces of the winding core include a first end surface and a second end surface, the first support plate is disposed outside the first end surface of the winding core, and the second support plate is disposed outside the second end surface of the winding core;

the projection of the first support plate on the first end face of the winding core is positioned inside the outer edge of the first end face of the winding core;

the projection of the second support plate on the second end face of the winding core is located inside the outer edge of the second end face of the winding core.

Optionally, two ends of the supporting column are respectively connected to the center of the first supporting plate and the center of the second supporting plate, and the supporting column is perpendicular to the first supporting plate and the second supporting plate.

Optionally, the first supporting plate is a flat plate, the second supporting plate is a flat plate, and the supporting column is a cylinder.

Optionally, the first support plate, the second support plate and the support column are respectively molded.

Optionally, the support columns comprise a first support column and a second support column; the first support column and the first support plate form an integrally formed first inner support member; the second support column and the second support plate form an integrally formed second inner support member.

Optionally, the first support column is an insertion column, and the second support column is correspondingly provided with an insertion hole; the first support column is inserted into the insertion hole of the second support column; or

The second supporting column is an inserting column, and an inserting hole is correspondingly formed in the first supporting column; the second support column is inserted in the insertion hole of the first support column.

Optionally, the cross-sectional shapes of the plug post and the plug hole correspond.

Optionally, a tight fitting part is arranged on the insertion column.

Optionally, the positive tab is bonded to one end face of the aluminum-plastic composite membrane shell through a first adhesive layer, and the negative tab is bonded to the other end face of the aluminum-plastic composite membrane shell through a second adhesive layer.

The utility model provides a soft-packaged button cell, compared with the prior art, through-hole department at the coiling core sets up inner support structure, soft-packaged button cell's both ends face receives when the extrusion, this extrusion force passes through aluminum-plastic composite membrane casing and acts on inner support structure, inner support structure plays the guard action to the both ends face of coiling the core, thereby avoid the both ends face of coiling the core directly to receive the collision extrusion and make positive plate or negative pole piece damage and fall the powder, prevent the inside short circuit of soft-packaged button cell, the unable atress extruded problem of the both ends face of having solved soft-packaged button cell, soft-packaged button cell's quality has been improved.

Drawings

Fig. 1 is a schematic view of a cross-sectional structure of a soft-package button battery provided in an embodiment of the present invention;

fig. 2 is a schematic cross-sectional structural view of a soft-packaged button battery according to another embodiment of the present invention;

FIG. 3 is a schematic structural view of the inner support structure of FIG. 2;

fig. 4 is a schematic structural view of a first inner supporting member according to another embodiment of the present invention;

fig. 5 is a schematic structural view of a first inner supporting member according to another embodiment of the present invention;

fig. 6 is a schematic structural diagram of an inner support structure according to another embodiment of the present invention;

fig. 7 is a schematic structural diagram of an internal support structure according to another embodiment of the present invention;

fig. 8 is a schematic structural diagram of an inner support structure according to another embodiment of the present invention.

The reference numerals in the specification are as follows:

1. a winding core; 11. a through hole;

2. an aluminum-plastic composite membrane shell;

3. an inner support structure; 3a, a first inner support; 3b, a second inner support;

31. a first support plate; 32. a second support plate;

33. a support pillar; 331. a first support column; 332. a second support column; 333. inserting holes;

334. a tight fitting part; 334a, an annular projection; 334b, bumps; 335. inserting grooves;

4. a positive tab; 5. a negative tab; 6. a first glue layer; 7. and a second adhesive layer.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

As shown in fig. 1, the soft-package button battery provided in the embodiment of the present invention includes a winding core 1, an aluminum-plastic composite film casing 2, and an inner support structure 3; the winding core 1 and the inner support structure 3 are packaged in the aluminum-plastic composite film shell 2, and the winding core 1 is formed by winding a positive plate, a diaphragm and a negative plate; the positive tab 4 is led out of the positive plate, and the positive tab 4 penetrates out of the aluminum-plastic composite film shell 2; a negative electrode lug 5 is led out of the negative electrode piece, and the negative electrode lug 5 penetrates through the aluminum-plastic composite membrane shell 2;

the axle center department of winding core 1 is equipped with the through-hole 11 that link up two terminal surfaces of winding core 1, and inner support structure 3 includes first backup pad 31, second backup pad 32 and support column 33, and first backup pad 31 and second backup pad 32 are located the both ends of winding core 1 off-plate respectively, and support column 33 wears to locate in through-hole 11, the both ends of support column 33 respectively with first backup pad 31 and second backup pad 32 fixed connection.

The embodiment of the utility model provides a soft-packaged button cell, compared with the prior art, through-hole 11 department at coiling core 1 sets up inner support structure 3, when soft-packaged button cell's both ends face received the extrusion, this extrusion force passes through aluminum-plastic composite membrane casing 2 and acts on inner support structure 3, inner support structure 3 plays the guard action to the both ends face of coiling core 1, thereby avoid the both ends face of coiling core 1 directly to receive the collision extrusion and make positive plate or negative pole piece damage fall the powder, prevent the inside short circuit of soft-packaged button cell, the unable atress extruded problem of both ends face of having solved soft-packaged button cell, soft-packaged button cell's quality has been improved.

In one embodiment, as shown in fig. 1, the two end surfaces of the winding core 1 include a first end surface and a second end surface, the first support plate 31 is disposed outside the first end surface of the winding core 1, and the second support plate 32 is disposed outside the second end surface of the winding core 1;

specifically, the projection of the first support plate 31 on the first end face of the winding core 1 is located inside the outer edge of the first end face of the winding core 1; the height of the soft package button battery is increased, the diameter of the soft package button battery is not changed, the inner space of the soft package button battery is saved to the maximum extent, and compared with soft package button batteries with other outer casings and hard shell structures, the volume energy density of the soft package button battery is improved.

Preferably, the first support plate 31 is a circular plate, and the diameter of the first support plate 31 is smaller than that of the winding core 1.

Specifically, the projection of the second support plate 32 on the second end face of the winding core 1 is located inside the outer edge of the second end face of the winding core 1; the height of the soft package button battery is increased, the diameter of the soft package button battery is not changed, the inner space of the soft package button battery is saved to the maximum extent, and compared with soft package button batteries with other outer casings and hard shell structures, the volume energy density of the soft package button battery is improved.

Preferably, the second support plate 32 is a circular plate, and the diameter of the second support plate 32 is smaller than that of the winding core 1.

In one embodiment, as shown in fig. 1, a first end of the supporting column 33 is connected to the center of the first supporting plate 31, and a second end of the supporting column 33 is connected to the center of the second supporting plate 32; the supporting columns 33 can better support the first supporting plate 31 and the second supporting plate 32, and the first supporting plate 31 and the second supporting plate 32 are prevented from being easily extruded to deform to the end face of the winding core 1 when the supporting columns 33 are supported at the edges of the first supporting plate 31 and the second supporting plate 32.

Preferably, the supporting columns 33 are perpendicular to the first supporting plate 31 and the second supporting plate 32; the support columns 33 can provide better support for the first support plate 31 and the second support plate 32.

Specifically, the first support plate 31 is a flat plate, and can more closely and stably press the positive tab 4 onto the first end surface of the aluminum-plastic composite film shell 2; the first supporting plate 31 can be prevented from puncturing the aluminum-plastic composite film shell 2;

the second support plate 32 is a flat plate, and can press the negative electrode tab 5 on the second end face of the aluminum-plastic composite film shell 2 more closely and more stably; the second support plate 32 can be prevented from piercing the aluminum-plastic composite film shell 2;

the supporting column 33 is a cylinder, so that the supporting column is convenient to be installed in cooperation with the winding core 1, and the winding core 1 is prevented from being scratched during installation.

Preferably, the inner support structure 3 is made of PP (polypropylene); the PP material has high strength and can bear certain extrusion force; the weight is light, and the overall weight of the soft package button battery can be reduced; the chemical resistance is good, and the corrosion of the electrolyte is avoided; the electrical insulation is good, and the short circuit is avoided inside the soft package button battery.

In one embodiment, first support plate 31, second support plate 32, and support posts 33 are formed separately; the manufacturing difficulty is reduced, and the processing and the installation are convenient.

When manufacturing the soft package button battery, firstly winding the positive plate, the diaphragm and the negative plate to form a winding core 1; then, respectively processing a first supporting plate 31, a second supporting plate 32 and a supporting column 33 by adopting a PP material; then inserting the supporting column 33 into the central hole of the winding core 1, and then respectively installing the first supporting plate 31 and the second supporting plate 32 at two ends of the winding core 1 and fixedly connecting with the supporting column 33; then, the winding core 1 and the inner supporting structure 3 are packaged by the aluminum-plastic composite film shell 2, and finally, the positive electrode tab 4 and the negative electrode tab 5 are respectively bent to two end faces of the aluminum-plastic composite film shell 2 and fixed.

In another embodiment, the first support plate 31 and the support columns 33 are integrally formed; or

The second support plate 32 and the support columns are integrally formed; facilitating the mounting of the internal support structure 3 and the winding core 1.

In another embodiment, as shown in fig. 2, the support columns 33 include a first support column 331 and a second support column 332; the first support column 331 and the first support plate 31 constitute an integrally formed first inner support 3 a; the second support column 332 and the second support plate 32 constitute an integrally formed second inner support 3 b; facilitating the mounting of the internal support structure 3 and the winding core 1.

Specifically, as shown in fig. 3 and fig. 6, the first supporting column 331 is an inserting column, and the second supporting column 332 is correspondingly provided with an inserting hole 333; the first support column 331 is inserted into the insertion hole 333 of the second support column 332;

or, the second supporting column 332 is an inserting column, and the first supporting column 331 is correspondingly provided with an inserting hole; the second support column 332 is inserted into the insertion hole of the first support column 331; the connection is more stable, the sliding of the first inner support piece 3a and the second inner support piece 3b is avoided, the structure is simple, and the processing and the installation are convenient.

Preferably, the cross-sectional shapes of the plugging columns and the plugging holes 333 correspond to each other, and are circular, polygonal or any other irregular shapes; the matching installation of the plug column and the plug hole 333 is convenient.

Optionally, the plug column is a cylinder, and the plug hole 333 is a circular hole; the installation is more convenient, and the specific installation alignment is not needed.

Optionally, the plug column is a square column, and the plug hole is a square hole; the rotation of the plugging column in the plugging hole is avoided, so that the connection between the first inner support piece 3a and the second inner support piece 3b is more stable.

In another embodiment, as shown in fig. 7, there are two plugging columns, and there are two plugging holes 333, where the plugging columns correspond to the plugging holes 333 one to one; the stability of the connection of the first inner support 3a and the second inner support 3b is improved, and the rotation of the plugging column in the plugging hole 333 is avoided.

In another embodiment, as shown in fig. 8, the first supporting column 331 is a plug-in column, and the second supporting column 332 is correspondingly provided with a plug-in slot 335; the first support column 331 is inserted into the insertion groove 335 of the second support column 332; is convenient for processing.

In one embodiment, as shown in fig. 4 and 5, the mating portion 334 is disposed on the plug post; the fastening and stability of the connection of the plugging column and the plugging hole 333 are enhanced.

Specifically, as shown in fig. 4, the fitting portion 334 is an annular projection 334a on the outer periphery of the plug post.

Specifically, as shown in fig. 5, the fitting portion 334 is a plurality of protrusions 334b annularly disposed on the outer periphery of the plug column, and the plurality of protrusions 334b are uniformly distributed around the outer periphery of the plug column.

In one embodiment, as shown in fig. 1, the positive tab 4 penetrates through the aluminum-plastic composite film shell 2 and is fixed on an end surface formed on the outer surface of the aluminum-plastic composite film shell 2;

the cathode lug 5 penetrates out of the aluminum-plastic composite film shell 2 and is fixed on the other end face formed on the outer surface of the aluminum-plastic composite film shell 2; soft packet of button cell can replace the duricrust battery direct mount in the battery compartment that extrusion formula (like upper and lower shell fragment or spring contact) electricity is connected, and interior bearing structure 3 is adjusted positive utmost point ear 4 and negative pole ear 5 and is played interior supporting effect to compress tightly respectively with positive utmost point ear 4 and negative pole ear 5 and paste on the electronic component in battery compartment, guarantee the stability of extrusion electricity connection, make soft packet of button cell's application more extensive.

Preferably, as shown in fig. 1, the positive tab 4 is bonded to one end surface of the aluminum-plastic composite film shell 2 through a first adhesive layer 6, and the negative tab 5 is bonded to the other end surface of the aluminum-plastic composite film shell 2 through a second adhesive layer 7; welding is not needed for connection, so that the processing difficulty is reduced, and the influence of welding on the soft package button battery is avoided; the positive electrode tab 4 and the negative electrode tab 5 are in direct contact with the electronic element, so that the connection impedance is reduced, and the connection structure is simple and stable.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A soft package button battery is characterized by comprising a winding core, an aluminum-plastic composite film shell and an inner support structure; the winding core and the inner support structure are packaged in the aluminum-plastic composite film shell, and the winding core is formed by winding a positive plate, a diaphragm and a negative plate; a positive lug is led out of the positive plate and penetrates out of the aluminum-plastic composite membrane shell; a negative electrode lug is led out of the negative electrode piece and penetrates out of the aluminum-plastic composite membrane shell;

a through hole penetrating through two end faces of the winding core is formed in the axis of the winding core; the inner supporting structure comprises a first supporting plate, a second supporting plate and a supporting column, the first supporting plate and the second supporting plate are respectively located outside two end faces of the winding core, the supporting column penetrates through the through hole, and two ends of the supporting column are respectively fixedly connected with the first supporting plate and the second supporting plate.

2. The soft-packaged button cell according to claim 1, wherein the two end surfaces of the winding core comprise a first end surface and a second end surface, the first support plate is disposed outside the first end surface of the winding core, and the second support plate is disposed outside the second end surface of the winding core;

the projection of the first support plate on the first end face of the winding core is positioned inside the outer edge of the first end face of the winding core;

the projection of the second support plate on the second end face of the winding core is located inside the outer edge of the second end face of the winding core.

3. The soft-packaged button cell according to claim 1, wherein two ends of the supporting column are connected to the center of the first supporting plate and the center of the second supporting plate respectively, and the supporting column is perpendicular to the first supporting plate and the second supporting plate.

4. The soft-packaged button cell according to claim 1, wherein the first support plate is a flat plate, the second support plate is a flat plate, and the support column is a cylinder.

5. The pouch button cell of claim 1, wherein the first support plate, the second support plate, and the support post are formed separately.

6. The pouch button cell according to claim 1, wherein the support posts comprise a first support post and a second support post; the first support column and the first support plate form an integrally formed first inner support member; the second support column and the second support plate form an integrally formed second inner support member.

7. The soft-package button battery according to claim 6, wherein the first support column is a plug-in column, and the second support column is correspondingly provided with a plug-in hole; the first support column is inserted into the insertion hole on the second support column; or

The second supporting column is an inserting column, and an inserting hole is correspondingly formed in the first supporting column; the second support column is inserted in the insertion hole on the first support column.

8. The soft-packaged button cell of claim 7, wherein the cross-sectional shapes of the peg posts and the peg holes correspond.

9. The soft-packaged button cell according to claim 7, wherein the insertion column is provided with a tight fitting part.

10. The soft-package button battery according to claim 1, wherein the positive tab is bonded to one end face of the aluminum-plastic composite film shell through a first adhesive layer, and the negative tab is bonded to the other end face of the aluminum-plastic composite film shell through a second adhesive layer.

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