Battery cell, battery module and electric device

Abstract

The present application relates to the technical field of batteries, and discloses a battery cell, a battery module and an electric device. The battery cell comprises an electrode assembly, an insulating film, and at least one side plate; at least part of the insulating film covers the electrode assembly; at least one side wall of the insulating film is provided with a plurality of first through holes; the side plate is sandwiched between the side wall of the insulating film provided with the first through holes and the electrode assembly and / or the side plate is attached to the side wall of the insulating film provided with the first through holes; the side plate is provided with a plurality of second through holes; and at least one of the second through holes is staggered from the first through holes. According to the battery cell, the electrolyte can completely infiltrate the internal electrode assembly, thereby ensuring the insulation performance between the electrode assembly and the casing while improving the infiltration effect, prolonging the service life of the battery cell and improving the use safety thereof.

Description

Battery cells, battery modules and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application with application number CN202323647879.2 and title “Battery Cells, Battery Modules and Electrical Devices” filed with the Patent Office of China on December 29, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cell, a battery module and an electrical device. Background Art

[0004] The electrode assembly of a lithium-ion battery needs to be insulated from the casing. To better protect the electrode assembly from contact with the casing and from burrs inside the casing, it is generally protected by a protective film. The electrode assembly of a lithium-ion battery needs to be fully and evenly soaked with electrolyte. If the insulating film completely covers the electrode assembly, the electrode assembly's soaking effect will be reduced, and the electrolyte will not be able to pass through the insulating film. If through holes are provided in the protective film to facilitate the flow of electrolyte in and out of the battery cell, there is a risk of the electrode assembly contacting the casing. Long-term use can also cause internal corrosion of the battery, posing a safety hazard.

[0005] Therefore, there is an urgent need to provide a new type of battery cell, battery module and power-consuming device to solve the above-mentioned technical problems in the prior art.

[0006] Application Contents

[0007] In view of this, the present application proposes a battery cell that can allow the electrolyte to completely infiltrate the internal electrode group and improve the infiltration effect, while ensuring the insulation performance between the electrode group and the shell, thereby improving the service life and safety of the battery cell.

[0008] The present application provides a battery cell, comprising an electrode group, an insulating film and at least one side plate;

[0009] At least a portion of the above-mentioned insulating film is covered on the above-mentioned pole group, and at least one side wall of the above-mentioned insulating film is provided with a plurality of first through holes; the above-mentioned side plate is sandwiched between the inner side wall of the above-mentioned insulating film provided with the above-mentioned first through holes and the side wall of the above-mentioned pole group, and / or the above-mentioned side plate is attached to the outer side wall of the above-mentioned insulating film provided with the above-mentioned first through holes, and the above-mentioned side plate is provided with a plurality of second through holes, and at least one of the above-mentioned second through holes is staggered with the above-mentioned first through hole.

[0010] Beneficial effects: An insulating film covers the outer surface of the electrode group, isolating the electrode group from the outer shell. The insulating film is provided with a first through-hole, through which the electrolyte can penetrate the electrode group, thereby improving the electrode group's infiltration into the electrolyte. The insulating film is also provided with a side plate, which is disposed on the outer side of the insulating film or sandwiched between the insulating film and the electrode group. The side plate is provided with a second through-hole, through which the electrolyte can also penetrate. The first through-hole and the second through-hole can be staggered, preventing the electrode group from contacting the outer shell through the first through-hole, thereby ensuring insulation between the electrode group and the outer shell and protecting the interior of the battery cell from corrosion by the electrolyte. This battery cell allows the electrolyte to fully penetrate the internal electrode group and improve the infiltration effect, while also ensuring insulation performance between the electrode group and the outer shell, thereby improving the battery cell's service life and safety.

[0011] In an optional embodiment, the insulating film is provided with a plurality of the first through holes on both end sidewalls along the width direction of the electrode group, and the plurality of the first through holes are arranged at intervals along the length direction of the electrode group.

[0012] In an optional embodiment, the side plates are extended along the length direction of the pole group, and the second through holes are spaced apart along the length direction of the pole group.

[0013] In an optional embodiment, the width of the side plate is L, the thickness of the pole group is W, and W-5mm≤L≤W+2mm.

[0014] In an optional embodiment, the number of the first through holes is greater than the number of the second through holes.

[0015] In an optional embodiment, in the first through hole and the second through hole that overlap with each other, an insulating tape is affixed to the first through hole or the second through hole.

[0016] In an optional embodiment, the side panels are fixed to the insulating film or the side panels by bonding or hot-melting.

[0017] In an optional embodiment, the thickness of the side panel is H, 0.2 mm ≤ H ≤ 2 mm.

[0018] Another object of the present application is to provide a battery module, which includes the battery cell as described in any of the above solutions.

[0019] Another object of the present application is to provide an electrical device comprising the battery module described in the above solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] FIG1 is an axonometric view of a battery cell provided in this application;

[0022] FIG2 is an exploded view of the battery cell provided in this application;

[0023] Explanation of reference numerals: 10 - electrode group; 20 - insulating film; 21 - first through hole; 30 - side plate; 31 - second through hole; 32 - insulating tape. DETAILED DESCRIPTION

[0024] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0025] Please refer to Figures 1 and 2. In this embodiment, the electrode group includes an electrode group 10, an insulating film 20 and at least one side plate 30; at least a portion of the above-mentioned insulating film 20 is coated on the above-mentioned electrode group 10, and at least one side wall of the above-mentioned insulating film 20 is provided with a plurality of first through holes 21; the above-mentioned side plate 30 is sandwiched between the side wall of the above-mentioned insulating film 20 with the above-mentioned first through holes 21 and the above-mentioned electrode group 10, and / or the above-mentioned side plate 30 is attached to the side wall of the above-mentioned insulating film 20 with the above-mentioned first through holes 21, and the above-mentioned side plate 30 is provided with a plurality of second through holes 31, and at least one of the above-mentioned second through holes 31 is staggered with the above-mentioned first through holes 21.

[0026] The electrode group in this embodiment includes an electrode group 10, an insulating film 20 and a side plate 30. The insulating film 20 is coated on the outer surface of the electrode group 10 to isolate the electrode group 10 from the outer shell. A first through hole 21 is provided on the insulating film 20, and the electrolyte can pass through the first through hole 21 to infiltrate the electrode group 10, which can improve the infiltration effect of the electrode group 10 in the electrolyte. At the same time, the insulating film 20 is attached to the side plate 30, and the side plate 30 is arranged on the outside of the insulating film 20 or the side plate 30 is sandwiched between the insulating film 20 and the electrode group 10. A second through hole 31 is provided on the side plate 30, and the electrolyte can also pass through the second through hole 31. The first through hole 21 and the second through hole 31 can be staggered so that the electrode group 10 will not contact the outer shell through the first through hole 21, thereby ensuring the insulation between the electrode group 10 and the outer shell and protecting the interior of the battery cell from corrosion by the electrolyte. The battery cell can allow the electrolyte to completely infiltrate the internal electrode group 10 and improve the infiltration effect, while ensuring the insulation performance between the electrode group 10 and the shell, thereby improving the service life and safety of the battery cell.

[0027] Continuing with Figure 1 , the insulating film 20 is provided with a plurality of first through holes 21 on both sidewalls along the width direction of the electrode assembly 10. These first through holes 21 are spaced apart along the length of the electrode assembly 10. This arrangement of the insulating film 20 and first through holes 21 allows the two sidewalls along the width direction of the battery cell to be used for the opening, reducing the difficulty of opening the first through holes 21 and thereby lowering production costs. Furthermore, the first through holes 21 provided along the width direction sidewalls of the electrode assembly 10 further enhance the electrolyte infiltration of the electrode assembly 10.

[0028] Furthermore, the side panels 30 extend along the length of the electrode assembly 10, and the second through holes 31 are spaced apart along the length of the electrode assembly 10. This configuration allows the side panels 30 to be manufactured in a smaller size, does not increase the weight of the battery cell, and reduces the difficulty and cost of producing the side panels 30.

[0029] As a preferred embodiment, the width of the side panel 30 is L, and the thickness of the electrode assembly 10 is W, where W - 5 mm ≤ L ≤ W + 2 mm. Setting the width of the side panel 30 to this value ensures that the side panel 30 is fully accommodated in the gap between the sidewall of the electrode assembly 10 and the insulating film 20. Interference between the side panel 30 and the insulating film 20 or loosening of the side panel 30 due to being too narrow on the insulating film 20 is avoided. This ensures insulation between the electrode assembly 10 and the outer casing, further improving the safety of the battery cell.

[0030] In this embodiment, the number of the first through holes 21 is greater than the number of the second through holes 31. Specifically, in this embodiment, six first through holes 21 are formed on one side wall of the insulating film 20, and one second through hole 31 is formed on one side plate 30. This ensures electrolyte infiltration while also ensuring insulation between the electrode group 10 and the housing.

[0031] Referring to Figures 1 and 2 , the overlapping first through-holes 21 and second through-holes 31 are each affixed with insulating tape 32. During production, when the side panels 30 are attached to the insulating film 20, the first through-holes 21 and second through-holes 31 inevitably overlap. To prevent the electrode assembly 10 from contacting the outer shell through the first through-holes 21 and second through-holes 31, insulating tape 32 is applied to the first through-holes 21 and second through-holes 31. This prevents the electrode assembly 10 from contacting the outer shell, further providing insulation. In this embodiment, the insulating tape 32 is attached to the side panels 30 and will not be further described here.

[0032] Furthermore, the side plate 30 is bonded or hot-melted to the insulating film 20 or the side plate 30. The bonding or hot-melt connection method is simple and reliable, and can reduce production costs, further improving the safety of the battery cell.

[0033] Specifically, the thickness of the side panel 30 is H, 0.2 mm ≤ H ≤ 2 mm. This thickness does not affect the original dimensions of the battery cell, ensuring that the original performance of the battery cell is not affected. It also increases the gap between the electrode group 10 and the outer shell, ensuring that the electrode group 10 does not contact the outer shell, further improving the insulation performance and the safety of the battery cell.

[0034] This embodiment also provides a battery module, which includes the battery cell described in any of the above solutions. The battery module uses the battery cell of the above solution and has all the beneficial effects of the above battery cell, which will not be repeated here.

[0035] This embodiment further provides an electrical device comprising the battery module described in the above embodiment. The electrical device may be an electric vehicle, electric bicycle, electric tricycle, ship, energy storage device, or other device that uses electricity as its energy source, without limitation. Powering the electrical device with the battery module described in the above embodiment improves the safety of the device, extends the battery module's service life, and reduces maintenance and subsequent operating costs.

[0036] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims. Industrial Applicability

[0037] The electrode group in the present application includes an electrode group, an insulating film and a side plate. The insulating film is coated on the outer surface of the electrode group to isolate the electrode group and the shell. A first through hole is provided on the insulating film. The electrolyte can penetrate the electrode group through the first through hole, which can improve the infiltration effect of the electrode group in the electrolyte. At the same time, the insulating film is attached with a side plate. The side plate is arranged on the outside of the insulating film or the side plate is sandwiched between the insulating film and the electrode group. A second through hole is provided on the side plate. The electrolyte can also pass through the second through hole. The first through hole and the second through hole can be staggered so that the electrode group will not contact the shell through the first through hole, thereby ensuring the insulation between the electrode group and the shell, and protecting the inside of the battery from being corroded by the electrolyte. The battery cell can allow the electrolyte to completely penetrate the internal electrode group and improve the infiltration effect while ensuring the insulation performance between the electrode group and the shell, thereby improving the service life and safety of the battery cell.

Claims

1. A battery cell, characterized in that, Comprising: Electrode group; Insulating film, at least part of the insulating film covers the electrode group, and a plurality of first through holes are formed in at least one side wall of the insulating film; At least one side plate, the side plate is clamped between the inner side wall of the insulating film provided with the first through hole and the side wall of the electrode group, and / or the side plate is attached to the outer side wall of the insulating film provided with the first through hole, and a plurality of second through holes are formed in the side plate, and at least one of the second through holes is arranged in a dislocation manner with the first through hole.

2. The battery cell according to claim 1, characterized in that, A plurality of the first through holes are formed in both side walls of the insulating film along the width direction of the electrode group, and the plurality of first through holes are arranged at intervals along the length direction of the electrode group.

3. The battery cell according to claim 2, wherein, The side plate extends along the length direction of the electrode group, and the second through holes are arranged at intervals along the length direction of the electrode group.

4. The cell according to claim 3, characterized in that, The number of the first through holes is greater than the number of the second through holes.

5. The battery cell according to claim 4, wherein Among the mutually overlapping first through hole and the second through hole, an insulating tape is attached to the first through hole or the second through hole.

6. The battery cell according to claim 3, characterized in that, The width of the side plate is L, the thickness of the electrode group is W, and W - 5mm ≤ L ≤ W + 2mm.

7. The battery cell according to any one of claims 1-6, characterized in that, The side plate is bonded or heat-melt fixed to the insulating film.

8. The battery cell according to any one of claims 1-6, characterized in that, The thickness of the side plate is H, and 0.2mm ≤ H ≤ 2mm.

9. Battery module, characterized in that, Comprising a battery cell according to any one of claims 1-8.

10. Electric device, characterized in that, Comprising a battery module according to claim 9.

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