Hard-shell battery and electronic equipment

Abstract

The utility model relates to a hard-shell battery and electronic equipment. The hard-shell battery comprises a hard shell and a battery cell. The hard-shell battery is provided with a first pole and a second pole. The battery cell is packaged in the hard shell, the battery cell comprises a battery cell body, a first tab and a second tab, the first tab and the second tab extend out of the battery cell body, the first tab comprises a plurality of layers of first current collectors which are arranged in a laminated manner, and a plurality of second current collectors are arranged along the laminated direction of the plurality of layers of first current collectors; the first pole comprises a first end face and a second end face which are oppositely arranged, the first end face and / or the second end face are / is arranged to be a welding face, the multiple layers of first current collectors are welded to the welding face, and the second pole lug is welded to the second pole. According to the scheme, the occupied space of the first tab is reduced, and the energy density of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a hard shell battery and an electronic device. Background Art

[0002] With 5G and 120H Z With the emergence of new technologies such as high refresh rate screens, electronic devices have put forward higher requirements for the volume energy density of batteries. At present, the energy density improvement of soft-pack batteries has basically reached a bottleneck. Steel-shell batteries have contributed to the improvement of energy density with ultra-thin shells, excellent dimensional tolerances, side R angle utilization, and vertical assembly. In addition, steel shells have higher strength and hardness than aluminum-plastic films. Utility Model Content

[0003] The present application provides a hard shell battery and electronic device, which can save space and improve battery energy density.

[0004] A hard case battery, comprising:

[0005] A hard housing having a first pole and a second pole; and

[0006] A battery cell is encapsulated in the hard shell, the battery cell comprising a battery cell body and a first pole tab and a second pole tab extending from the battery cell body, the first pole tab comprising a stacked plurality of first current collectors, along the stacking direction of the plurality of first current collectors, the first pole comprising a first end face and a second end face oppositely arranged, the first end face and / or the second end face being arranged as a welding surface, the plurality of first current collectors being welded to the welding surface, and the second pole tab being welded to the second pole.

[0007] Optionally, the multi-layer first current collector is configured to bend from the root extending out of the battery cell body toward the welding surface, and the multi-layer first current collector is welded at the rear side of the bend to form a pre-welding portion before being welded to the welding surface, and the pre-welding portion is welded to the welding surface.

[0008] Optionally, the pre-welding portion is directly welded to the welding surface; or

[0009] The pre-welding portion is welded to the welding surface via a conductive sheet.

[0010] Optionally, the first pole is arranged to have a uniform cross-section structure in a stacking direction of the multi-layer first current collector, and the cross-section of the first pole is in a polygonal shape.

[0011] Optionally, the multi-layer first current collector has a first current collector I closest to the first end surface and a first current collector II farthest from the first end surface along the stacking direction, and the first end surface exceeds the first current collector I in the stacking direction.

[0012] Optionally, the second end surface is flush with the first current collector II in the stacking direction.

[0013] Optionally, a portion of the multi-layer first current collector is welded to the first end surface, and the remaining portion of the multi-layer first current collector is welded to the second end surface.

[0014] Optionally, the second pole tab is formed by stacking multiple layers of second current collectors in the thickness direction of the battery cell body, the second pole includes a third end face and a fourth end face arranged opposite to each other in the thickness direction, and the multiple layers of second current collectors are welded to the third end face and / or the fourth end face.

[0015] Optionally, the first pole lug and the second pole lug extend from the same side of the battery cell body.

[0016] An electronic device comprises the hard shell battery described in any one of the above items.

[0017] The present application provides a hard shell battery and electronic device, wherein the first pole ear comprises a stacked multi-layer first current collector, and the first end face and / or the second end face of the first pole in the stacking direction of the multi-layer first current collector is set as a welding surface. In this way, the stacking direction of the multi-layer first current collector is consistent with the extension direction of the first pole, so that the multi-layer first current collector forming the first pole ear can be welded to the welding surface after a small number of bends, reducing the space required for the transfer welding between the first pole ear and the first pole, and improving the energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the internal structure of an existing hard shell battery;

[0019] Figure 2 is a cross-sectional view of a hard-shell battery shown in an exemplary embodiment of the present application;

[0020] Figure 3 is a schematic diagram of a hard shell shown in an exemplary embodiment of the present application;

[0021] Figure 4 yes Figure 1 A schematic diagram of a partial structure of a hard shell battery shown in;

[0022] Figure 5 FIG. 1 is a schematic diagram of a first pole shown in an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0023] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application.

[0024] The terms used in this application are only for the purpose of describing specific embodiments, and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one" or "one" do not indicate quantity restrictions, but indicate that there is at least one, and will be separately described if only "one" is referred to. "Multiple" or "several" means two or more. Unless otherwise specified, similar words such as "front", "rear", "lower" and / or "upper", "top", "bottom" are only for the convenience of explanation, and are not limited to one position or one spatial orientation. Similar words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" cover the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. The words "connected" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0025] Please refer to Figure 1 , Figure 1 The figure is a schematic diagram of welding the first pole ear and the first pole of the battery cell in the prior art.

[0026] like Figure 1 As shown, the stacked multiple layers of first current collector form a first pole ear 1, which is bent multiple times and then welded to the cylindrical first pole 2, and is welded to the surface of the first pole 2 facing the battery cell. Figure 1 The transfer welding scheme in the embodiment will waste the length space in the shell due to the multiple bending of the first pole ear 1. In addition, the existing welding scheme of the first pole ear 1 and the first pole column 2 requires the first pole ear 1 and the first pole column 2 to be welded before the battery cell is flipped into the shell. The flipping angle and the length of the gap between the battery cell and the shell must be controlled, which requires high requirements on both equipment and process. Based on this, the present application provides a hard shell battery 100, which can save space in the shell and improve energy density.

[0027] Please refer to Figures 2 to 4 , Figure 2is a cross-sectional view of a hard case battery 100 shown in an exemplary embodiment of the present application. Figure 3 yes Figure 1 A schematic diagram of the hard shell 10 is shown in FIG. Figure 4 yes Figure 1 Schematic diagram of a partial structure of a hard shell battery 100 is shown in FIG.

[0028] The embodiment of the present application provides a hard shell battery 100, which includes a hard shell 10 and a battery cell 20 encapsulated in the hard shell 10. The hard shell 10 is filled with an electrolyte, and the battery cell 20 is immersed in the electrolyte. The hard shell 10 includes but is not limited to a stainless steel shell and a titanium alloy shell. The hard shell 10 is provided with a first pole 11 and a second pole 12, one of the first pole 11 and the second pole 12 is a positive pole, and the other is a negative pole. In one embodiment, the first pole 11 and the second pole 12 can be insulated from the hard shell 10. In another embodiment, the positive pole is insulated from the hard shell 10, and the negative pole is directly welded to the hard shell 10. The first pole 11 is partially located inside the hard shell 10 and partially located outside the hard shell 10, and the second pole 12 is partially located inside the hard shell 10 and partially located outside the hard shell 10.

[0029] The battery cell 20 includes a battery cell body 21 and a first pole lug 22 and a second pole lug 23 extending from the battery cell body 21, one of the first pole lug 22 and the second pole lug 23 is a positive pole lug, and the other is a negative pole lug. The portion of the first pole 11 located inside the hard shell 10 is welded to the first pole lug 22, and the portion of the first pole 11 located outside the hard shell 10 is used to connect to an external circuit, and the first pole 11 and the first pole lug 22 have the same polarity. The portion of the second pole 12 located inside the hard shell 10 is welded to the second pole lug 23, and the portion of the second pole 12 located outside the hard shell 10 is used to connect to an external circuit, and the second pole 12 and the second pole lug 23 have the same polarity.

[0030] The cell body 21 can be formed by winding or stacking a first pole piece, a second pole piece, and an isolating film. The isolating film is provided between the first pole piece and the second pole piece to isolate the first pole piece and the second pole piece, so that the first pole piece and the second pole piece are insulated. The first pole piece includes a first current collector and a first active slurry coated on the first current collector, and the second pole piece includes a second current collector and a second active slurry coated on the second current collector. Among them, the portion of the first current collector not coated with the first active slurry can be used to form a first pole ear, and the portion of the second current collector not coated with the second active slurry can be used to form a second pole ear.

[0031] like Figure 2 As shown, the first electrode tab 22 includes a plurality of first current collectors 220 stacked in layers, and the first electrode column 11 is disposed along a stacking direction ( Figure 2The first pole 11 includes a first end face 110 and a second end face 112 arranged opposite to each other in the stacking direction. The first end face 110 and / or the second end face 112 are set as welding surfaces, and the multi-layer first current collector 220 is welded to the welding surface. In other words, the stacking direction of the multi-layer first current collector 220 is consistent with the extension direction of the first pole 11, which allows the multi-layer first current collector 220 to be welded to the welding surface after fewer bends, thereby reducing the space required for the transfer welding of the first pole ear 22 and the first pole 11 and improving the energy density. In addition, the battery cell 20 can be put into the shell before the first pole ear 22 is welded to the first pole 11, without the need to flip it into the shell after welding, and has lower requirements for equipment and processes.

[0032] In one embodiment, the multi-layer first current collector 220 can also be pre-welded before being welded to the welding surface. After pre-welding, the multi-layer first current collector 220 can be more conveniently welded to the welding surface. Specifically, the multi-layer first current collector 220 is configured to bend from the root extending from the battery body 21 to the welding surface, and the multi-layer first current collector 220 is welded at the rear side of the bend to form a pre-welding portion 221 before being welded to the welding surface, and the pre-welding portion 221 is welded to the welding surface. In this way, the multi-layer first current collector 220 can maintain a regular morphology and a compact structure through pre-welding, and can then be reliably welded to the welding surface to avoid virtual connection affecting the power output. In addition, the length of each layer of the first current collector 220 extending from the battery body 21 can be set according to the position of the multi-layer first current collector 220 in the stacking direction, so that the ends can be ensured to be roughly flush after the multi-layer first current collector 220 is bent together.

[0033] In one embodiment, the pre-welding portion 221 is directly welded to the welding surface. During welding, the pre-welding portion 221 can be bent so that the pre-welding portion 221 is further bent toward the welding surface and fits with the welding surface. In another embodiment, the pre-welding portion 221 is welded to the welding surface through a conductive sheet. The conductive sheet can play a bridging role, is convenient for connection, and can also reduce multiple bendings of the multi-layer first current collector 220. The material of the conductive sheet is not limited as long as it can conduct current.

[0034] Please refer to Figure 5 , Figure 5 This is a schematic diagram of a first pole 11 according to an exemplary embodiment of the present application.

[0035] In one embodiment, the first pole 11 is arranged as a uniform cross-section structure in the stacking direction of the multi-layer first current collector 220, and the cross-section of the first pole 11 is a polygon. In this way, the first pole 11 is easy to process and manufacture. The first pole 11 includes but is not limited to a cuboid.

[0036] In one embodiment, Figure 2 As shown, the multi-layer first current collector 220 has a first current collector I 220a closest to the first end face 110 and a first current collector II 220b farthest from the first end face 110 along the stacking direction, and the first end face 110 exceeds the first current collector I 220a in the stacking direction. In this way, the multi-layer first current collector 220 can be bent toward the first end face 110 in the same direction, and the multi-layer first current collector 220 can also be pre-welded together before being welded to the first end face 110.

[0037] In one embodiment, the second end surface 112 is flush with the first current collector II 220 b in the stacking direction of the first electrode tabs 22. This can increase the length of the first electrode column 11 and improve the current carrying capacity of the first electrode column 11.

[0038] In some other embodiments, the multi-layer first current collector 220 can be welded separately. Specifically, a portion of the multi-layer first current collector 220 is welded to the first end surface 110, and the rest of the multi-layer first current collector 220 is welded to the second end surface 112. In this way, the multi-layer first current collector 220 can be divided into two parts, which are respectively welded to the two end surfaces of the first pole 11. In this way, since the number of layers of the first current collector 220 in each part is relatively small relative to the total number, it can be more convenient to bend and pre-weld.

[0039] In one embodiment, the second pole lug 23 may also include a plurality of stacked second current collectors, the plurality of second current collectors are stacked in the thickness direction of the battery body, the second pole includes a third end face and a fourth end face arranged opposite to each other in the stacking direction, and the plurality of second current collectors are welded to the third end face and / or the fourth end face. In this way, the stacking direction of the plurality of second current collectors is consistent with the extension direction of the second pole 12, so that the plurality of second current collectors can be welded to the welding surface of the second pole 12 after fewer bends, thereby reducing the space required for the transfer welding between the second pole lug 23 and the second pole 12, and further improving the energy density. The second pole 12 can be set as a rectangular parallelepiped with equal cross-section, but is not limited thereto. Among them, the stacking direction of the plurality of second current collectors is the same as the stacking direction of the plurality of first current collectors.

[0040] In one embodiment, the first pole tab 22 and the second pole tab 23 extend from the same side of the cell body 21 , and the first pole 11 and the second pole 12 are disposed on the same side of the hard shell 10 .

[0041] The present application also provides an electronic device, which includes the hard shell battery 100. The electronic device includes but is not limited to a mobile phone, a tablet computer, a mobile payment terminal, etc. The hard shell battery 100 includes but is not limited to a lithium ion battery and a sodium ion battery.

[0042] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A hard shell battery, characterized in that: include: A hard housing having a first pole and a second pole; and A battery cell is encapsulated in the hard shell, the battery cell comprising a battery cell body and a first pole tab and a second pole tab extending from the battery cell body, the first pole tab comprising a stacked plurality of first current collectors, along the stacking direction of the plurality of first current collectors, the first pole comprising a first end face and a second end face oppositely arranged, the first end face and / or the second end face being arranged as a welding surface, the plurality of first current collectors being welded to the welding surface, and the second pole tab being welded to the second pole.

2. The hard shell battery according to claim 1, characterized in that: The multi-layer first current collector is configured to bend from the root extending from the battery body to the welding surface, and the multi-layer first current collector is welded at the rear side of the bend to form a pre-welding portion before being welded to the welding surface, and the pre-welding portion is welded to the welding surface.

3. The hard case battery according to claim 2, characterized in that: The pre-welding portion is directly welded to the welding surface; or The pre-welding portion is welded to the welding surface via a conductive sheet.

4. The hard case battery according to claim 1, characterized in that: The first pole is arranged as a uniform cross-section structure in the stacking direction of the multi-layer first current collector, and the cross-section of the first pole is in a polygonal shape.

5. The hard case battery according to claim 1, characterized in that: The multi-layer first current collector has a first current collector I closest to the first end surface and a first current collector II farthest from the first end surface along the stacking direction, and the first end surface exceeds the first current collector I in the stacking direction.

6. The hard case battery according to claim 5, characterized in that: The second end surface is flush with the first current collector II in the stacking direction.

7. The hard case battery according to any one of claims 1 to 6, characterized in that: A portion of the multi-layer first current collector is welded to the first end surface, and the remaining portion of the multi-layer first current collector is welded to the second end surface.

8. The hard case battery according to any one of claims 1 to 6, characterized in that: The second pole tab is formed by stacking multiple layers of second current collectors in the thickness direction of the battery body, the second pole includes a third end face and a fourth end face arranged opposite to each other in the thickness direction, and the multiple layers of second current collectors are welded to the third end face and / or the fourth end face.

9. The hard case battery according to any one of claims 1 to 6, characterized in that: The first pole tab and the second pole tab extend from the same side of the battery cell body.

10. An electronic device, characterized in that: Comprising the hard shell battery as claimed in any one of claims 1 to 9.

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