Filling piece, collector plate, collector plate assembly, cylindrical battery and battery pack

Abstract

The utility model provides a filling piece, a collector plate, a collector plate assembly, a cylindrical battery and a battery pack, and belongs to the technical field of batteries, the filling piece comprises a first part corresponding to a central hole of the cylindrical battery and a second part corresponding to the collector plate; the first part is of a columnar structure, and the interior of the columnar structure is hollow; the second part is an extension part extending from the end edge of the columnar structure to the radial direction, the extension part is of a fan-shaped structure, and the fan-shaped structure comprises a plurality of petals; and the filling piece is made of a high polymer material with light, porous and elastic properties. The filling piece provided by the utility model has the beneficial effects that the electrolyte in the battery can be absorbed upwards through the capillary action of the porous property, so that the infiltration uniformity of the electrolyte of the battery is improved, and the problem of insufficient infiltration of the upper part is solved; meanwhile, the elastic property provides a certain supporting effect on the battery roll core, and uneven stress caused by shrinkage and expansion of the roll core in the charging and discharging process can be relieved, so that the service life of the battery is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a filling piece, a current collecting plate, a current collecting plate assembly, a cylindrical battery and a battery pack. Background Art

[0002] Cylindrical batteries have attracted widespread attention in the power battery field due to their advantages, such as easy assembly in modules and battery packs and effective heat management. With the market's increasing demand for battery energy density and range, the development of larger, higher-energy-density cylindrical batteries has become both a hot topic and a challenge within the industry. However, this development trend also places more stringent requirements on the electrolyte wettability within cylindrical batteries.

[0003] Traditional cylindrical battery designs typically reserve a certain amount of air chamber space to mitigate the problem of excessive internal pressure caused by side reaction gases generated during charging and discharging. Furthermore, the repeated contraction and expansion of the core during charging and discharging can lead to uneven electrolyte distribution within the battery. This is particularly true in the upper portion of the cylindrical battery, where abnormalities such as poor wetting, black spot formation, and even lithium deposition can occur, impacting long-term operation. These electrolyte wetting issues not only directly affect the battery's energy output efficiency and cycle stability, but can also accelerate the degradation of the battery's internal structure, shortening its service life and posing a potential threat to the reliability and safety of new energy vehicles. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a filler, a current collecting plate, a current collecting plate assembly, a cylindrical battery and a battery pack for improving wetting.

[0005] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0006] A first aspect of the present invention is to provide a filling member for use in a cylindrical battery, the filling member comprising a first portion corresponding to a central hole of the cylindrical battery and a second portion corresponding to a current collecting plate;

[0007] The first part is a columnar structure, and the interior of the columnar structure is hollow;

[0008] The second portion is an extension portion extending radially from the end edge of the columnar structure, the extension portion is a fan-shaped structure, and the fan-shaped structure includes multiple petals;

[0009] The filling piece is made of a porous and elastic polymer material.

[0010] Preferably, the polymer material is selected from one of polyvinyl alcohol, polyvinyl chloride, polystyrene, polyethyleneimine, polyacrylate, polyamide, and cellulose derivatives.

[0011] Preferably, the porosity of the filling member is 50% to 90%.

[0012] Preferably, the pore size of the filling member is 10 μm to 500 μm.

[0013] Preferably, the thickness of the columnar structure is in the millimeter order;

[0014] The thickness of the fan-shaped structure is on the millimeter level.

[0015] Preferably, the thickness of the filling piece is 1 mm to 5 mm.

[0016] Preferably, the columnar structure and the extension portion are integrally formed.

[0017] The second aspect of the present invention is to provide a current collecting tray for use with the above-mentioned filler, which is applied to cylindrical batteries and includes:

[0018] A current collecting plate body, wherein the current collecting plate body has a through hole corresponding to the center hole of the cylindrical battery and through which the first part of the filling member can pass;

[0019] A first groove matching the second portion of the filling piece is provided on a surface of the collecting plate body close to the filling piece.

[0020] The third aspect of the present invention is to provide a current collecting plate assembly for use in cylindrical batteries, comprising a filler as described above and a current collecting plate as described above, wherein the first portion of the filler is inserted into the through hole of the current collecting plate, and the second portion of the filler is placed in the first groove of the current collecting plate.

[0021] The fourth aspect of the present invention is to provide a cylindrical battery, comprising a filler as described above and a current collecting plate as described above, wherein the first portion of the filler is inserted into the through hole of the current collecting plate, the second portion of the filler is placed in the first groove of the current collecting plate, and the current collecting plate cover is arranged on the pole piece of the cylindrical battery.

[0022] A fifth aspect of the present invention is to provide a battery pack, in which a plurality of cylindrical batteries as described above are integrated.

[0023] The advantages or beneficial effects of the technical solution of the utility model are:

[0024] The filler provided by the utility model can absorb the electrolyte inside the battery upward through the capillary action of its porous properties, thereby improving the uniformity of the battery electrolyte infiltration and alleviating the problem of insufficient infiltration in the upper part; at the same time, its elastic properties provide a certain support effect on the battery coil core, which can alleviate the uneven force caused by the contraction and expansion of the coil core during the charging and discharging process, thereby extending the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a filler for improving wetting in a preferred embodiment of the present invention;

[0026] Figure 2 This is a structural diagram of a current collecting plate used in conjunction with a filling piece in a preferred embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 100 , filling piece; 101 , columnar structure; 102 , fan-shaped structure; 200 , collecting plate; 201 , collecting plate body; 202 , through hole; 203 , first groove. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0032] See also Figure 1 In a preferred embodiment of the present invention, based on the above-mentioned problems existing in the prior art, a filler 100 with improved wettability is provided, which is applied to cylindrical batteries. The filler 100 includes a first portion corresponding to the central hole of the cylindrical battery and a second portion corresponding to the current collecting plate 200.

[0033] The first part is a columnar structure 101, and the interior of the columnar structure 101 is hollow;

[0034] The second portion is an extension portion extending radially from the end edge of the columnar structure 101. The extension portion is a fan-shaped structure 102. The fan-shaped structure 102 includes multiple petals.

[0035] The filling member 100 is made of a porous and elastic polymer material.

[0036] Specifically, the filling piece 100 in the central hole portion is a columnar structure 101 with a thickness of millimeters. The columnar structure 101 matches the central hole of the cylindrical battery and is used to guide and absorb the electrolyte.

[0037] In this embodiment, the columnar structure 101 is a hollow columnar structure 101. The hollow design can reduce the overall weight of the filler 100. At the same time, the internal space increases the storage and distribution capacity of the electrolyte, which helps to improve the infiltration efficiency of the electrolyte.

[0038] The filling piece 100 of the collecting plate 200 is an extension radially extending from the hollow columnar structure 101. The extension is a multi-petal fan-shaped structure 102 with a thickness of millimeters. The petals are evenly distributed at a predetermined angle.

[0039] The filler 100 is made of a lightweight, porous, and elastic polymer material. The capillary action of the porous filler 100 draws the electrolyte from the cylindrical battery upward, improving the uniformity of electrolyte penetration and addressing the problem of insufficient penetration in the upper portion. Furthermore, the elastic nature of the filler 100 provides support for the winding core, alleviating the uneven force caused by the winding core's contraction and expansion during charging and discharging, thereby extending the life of the cylindrical battery.

[0040] As a preferred embodiment, the polymer material is selected from one of polyvinyl alcohol, polyvinyl chloride, polystyrene, polyethyleneimine, polyacrylate, polyamide, and cellulose derivatives.

[0041] In this embodiment, the material of the filling member 100 includes but is not limited to polyvinyl alcohol, polyvinyl chloride, polystyrene, polyethyleneimine, polyacrylate, polyamide, cellulose derivatives, etc.

[0042] These materials are lightweight. Using the filler 100 made of these lightweight materials can reduce the weight of the filler 100 , thereby further significantly reducing the overall weight of the battery and improving the energy density.

[0043] These materials are also porous, and this porous property enables the filler 100 to form an internal porous structure. These micropores can produce a capillary effect, promoting the rapid infiltration of the electrolyte into the battery.

[0044] These materials also have elastic properties. This elastic property enables the filler 100 to effectively alleviate the contraction and expansion of the winding core during the battery charging and discharging process, reducing performance degradation caused by uneven force.

[0045] As a preferred embodiment, the porosity of the filling member 100 is 50% to 90%.

[0046] Porosity refers to the percentage of pore volume within filler 100 to the total volume. The porosity of filler 100 is set within a range of 50% to 90%. A higher porosity means more space within filler 100 for electrolyte to fill, and a lower solids content within filler 100, resulting in a lighter filler 100.

[0047] By way of example and not limitation, the porosity of the filler 100 may be 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, or 90%.

[0048] As a preferred embodiment, the pore size of the filling member 100 may be 10 μm to 500 μm.

[0049] Specifically, a pore size that is too small may make the filler 100 more susceptible to deformation or rupture when subjected to external forces; while a pore size that is too large may reduce the mechanical strength of the filler 100, shortening its battery life. In this embodiment, the pore size of the filler 100 is set within the range of 10 microns to 500 microns, which facilitates rapid and uniform infiltration of the electrolyte.

[0050] As a preferred embodiment, the thickness of the columnar structure 101 is in the millimeter range;

[0051] The thickness of the fan-shaped structure 102 is on the millimeter level.

[0052] As a preferred embodiment, the thickness of the filling member 100 is 1 mm to 5 mm.

[0053] In this embodiment, the thickness of the columnar structure 101 is set within a range of 1 mm to 5 mm, and the thickness of the fan-shaped structure 102 is also set within a range of 1 mm to 5 mm.

[0054] As a preferred embodiment, the columnar structure 101 and the fan-shaped structure 102 of the extension portion are integrally formed.

[0055] The present invention also provides a current collecting plate 200, which is applied to cylindrical batteries and includes:

[0056] The collecting plate body 201 has a through hole 202 corresponding to the center hole of the cylindrical battery, through which the first part of the filling member 100 can pass;

[0057] A first groove 203 matching the second portion of the filling piece 100 is formed on a surface of the collecting plate body 201 close to the filling piece 100 .

[0058] Furthermore, the collecting plate body 201 has a first surface and a second surface facing each other. The first surface is the surface adjacent to the filler 100 and has a shape that matches the filler 100. The second portion of the filler 100 is an extended fan-shaped structure 102. Therefore, the first surface of the collecting plate body 201 is provided with a first groove 203 that cooperates with the fan-shaped structure 102 of the second portion, and the first groove 203 is also a fan-shaped structure 102.

[0059] The second surface is a surface away from the filling member 100 . A second groove is formed on the second surface, and the second groove is also a fan-shaped structure 102 .

[0060] Furthermore, in the circumferential direction and the vertical direction of the collecting plate body 201 , the first grooves 203 and the second grooves are alternately arranged.

[0061] In this embodiment, a current collecting plate 200 is provided in the cylindrical battery for use with the filling member 100. Figure 2 shown.

[0062] Furthermore, the current collecting plate 200 also has a welding line, which is arranged on the first groove 203 .

[0063] The present invention also provides a current collecting plate assembly for use in cylindrical batteries, comprising a filler 100 as described above and a current collecting plate 200 as described above, wherein a first portion of the filler 100 is inserted into a through hole 202 of the current collecting plate 200, and a second portion of the filler 100 is placed in a first groove 203 of the current collecting plate 200.

[0064] The present invention also provides a cylindrical battery, comprising a filling piece 100 as described above and a current collecting plate 200 as described above, wherein a first portion of the filling piece 100 is passed through a through hole 202 of the current collecting plate 200, and a second portion of the filling piece 100 is placed in a first groove 203 of the current collecting plate 200, and the current collecting plate 200 is covered on the pole piece of the cylindrical battery.

[0065] Specifically, the cylindrical battery has a central hole to reserve a certain amount of air chamber space to alleviate the problem of excessive internal pressure increase caused by side reaction gases generated during the charging and discharging process.

[0066] An integrated filler 100 is installed between the central hole and the current collecting tray 200 of the cylindrical battery. The second portion of the filler 100 mates with the current collecting tray 200. The first portion of the filler 100 passes through the through-hole 202 of the current collecting tray 200 and is placed in the central hole. The multi-lobed fan-shaped structure 102 of the second portion of the filler 100 is placed in the first groove 203 of the current collecting tray 200.

[0067] The combined application of the filler 100 and the current collecting plate 200 significantly improves the electrolyte wetting effect and overall performance of the cylindrical battery.

[0068] In this embodiment, the cylindrical battery is a cylindrical battery. In the cylindrical battery, the synergistic effect of the filler 100 and the current collecting plate 200 effectively solves the problem of insufficient upper wetting, while also alleviating the uneven force on the winding core during the charging and discharging process, thereby extending the battery life.

[0069] The utility model also provides a battery pack, in which the plurality of cylindrical batteries as described above are integrated.

[0070] The advantages or beneficial effects of adopting the above technical solution are: the filler provided by the utility model can absorb the electrolyte inside the battery upward through the capillary action of its porous properties, thereby improving the uniformity of the battery electrolyte infiltration and improving the problem of insufficient infiltration in the upper part; at the same time, its elastic properties provide a certain support effect on the battery coil core, which can alleviate the uneven force caused by the contraction and expansion of the coil core during the charging and discharging process, thereby extending the service life of the battery.

[0071] The above are only preferred embodiments of the present invention and do not limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of this specification and illustrations should be included in the protection scope of the present invention.

Claims

1. A filler for cylindrical batteries, characterized in that: The filling member includes a first portion corresponding to the central hole of the cylindrical battery and a second portion corresponding to the current collecting plate; The first part is a columnar structure, and the interior of the columnar structure is hollow; The second portion is an extension portion extending radially from the end edge of the columnar structure, the extension portion is a fan-shaped structure, and the fan-shaped structure includes multiple petals; The filling piece is made of a porous and elastic polymer material.

2. The filling piece according to claim 1, characterized in that The polymer material is selected from one of polyvinyl alcohol, polyvinyl chloride, polystyrene, polyethyleneimine, polyacrylate, polyamide, and cellulose derivatives.

3. The filling piece according to claim 1, wherein: The porosity of the filling member is 50% to 90%.

4. The filling piece according to claim 1, wherein The pore diameter of the filling member is 10 μm to 500 μm.

5. The filling piece according to claim 1, wherein The thickness of the columnar structure is in the millimeter order; The thickness of the fan-shaped structure is on the millimeter level.

6. The filling piece according to claim 5, characterized in that The thickness of the filling piece is 1 mm to 5 mm.

7. The filling piece according to claim 1, characterized in that The columnar structure and the extension portion are integrally formed.

8. A current collecting tray used in conjunction with the filler according to any one of claims 1 to 7, applied to a cylindrical battery, characterized in that: include: A current collecting plate body, wherein the current collecting plate body has a through hole corresponding to the center hole of the cylindrical battery and is provided with a first portion of the filling member; A first groove matching the second portion of the filling piece is provided on a surface of the collecting plate body close to the filling piece.

9. A current collecting plate assembly, applied to cylindrical batteries, characterized in that: It comprises the filling piece according to any one of claims 1 to 7 and the current collecting plate according to claim 8, wherein the first portion of the filling piece is inserted into the through hole of the current collecting plate, and the second portion of the filling piece is placed in the first groove of the current collecting plate.

10. A cylindrical battery, characterized in that: It comprises the filling piece according to any one of claims 1 to 7 and the current collecting plate according to claim 8, wherein the first portion of the filling piece is inserted into the through hole of the current collecting plate, the second portion of the filling piece is placed in the first groove of the current collecting plate, and the current collecting plate cover is arranged on the pole piece of the cylindrical battery.

11. A battery pack, characterized in that: The battery pack integrates a plurality of cylindrical batteries as claimed in claim 10.

Images