Battery

Abstract

The utility model discloses a battery. The battery comprises: a housing having a storage cavity; the battery cell is arranged in the storage cavity, the battery cell comprises a main body and a first tab, the first tab comprises a first body part and a first insulating layer, the first body part is coated with the first insulating layer, and the first insulating layer is arranged between the main body and the first body part; one side of the first insulating layer is attached to the main body, the first body part is electrically connected to the main body, and the side, back to the first insulating layer, of the first body part is electrically connected with the shell. The battery provided by the utility model can have higher energy density.

Description

TECHNICAL FIELD

[0001] The utility model relates to the battery field, concretely relates to battery. BACKGROUND

[0002] Among many battery types, cylindrical batteries are favored by consumers due to their excellent space utilization, robust structural stability, and flexibility in battery pack configurations. This design not only enables the battery to provide more energy in a limited space, but also helps maintain long-term stability of battery performance and reduces the risk of failure due to physical damage. Ensuring the safety of the battery while maintaining its performance has become one of the main problems in battery design, especially between the negative tab and the positive tab inside the battery, which requires good insulation effect. If the negative tab and the positive tab come into contact, it may cause internal short circuit of the battery, leading to overheating, performance degradation, or even safety accidents.

[0003] In related technologies, in order to effectively avoid battery short circuit, an insulating gasket is usually provided between the negative tab and the main body of the battery cell. The insulating gasket can achieve insulation between the negative tab and the main body of the battery cell. However, due to the gap between the insulating gasket and the negative tab (the insulating gasket and the negative tab cannot be completely attached), this will result in low energy density of the battery. SUMMARY

[0004] The utility model aims at at least solves one of the prior art technical problems. Therefore, the utility model provides a battery, which can have high energy density.

[0005] The battery according to the utility model embodiment comprises:

[0006] A shell, the shell has a storage cavity;

[0007] A battery cell, the battery cell is arranged in the storage cavity, the battery cell comprises a main body and a first tab, the first tab comprises a first body part and a first insulating layer, the first insulating layer is coated on the first body part, the first insulating layer is arranged between the main body and the first body part, one side of the first insulating layer is attached to the main body, the first body part is electrically connected to the main body, and one side of the first body part, opposite to the first insulating layer, is electrically connected to the shell.

[0008] The battery has the following beneficial effects: the battery has high energy density.

[0009] According to some embodiments of the present application, the battery further comprises a connecting piece and a second tab, the second tab comprises a second body part and a second insulating layer, the second insulating layer is coated on the second body part, the second insulating layer is arranged between the main body and the second body part, one side of the second insulating layer is attached to the main body, the second body part is electrically connected to the main body, and one side of the second body part opposite to the second insulating layer is electrically connected to the connecting piece.

[0010] According to some embodiments of the present application, the battery is provided with a hollow area, the first body part comprises a coated area and a non-coated area, the first insulating layer is coated on the coated area, and the position of the non-coated area corresponds to the position of the hollow area.

[0011] According to some embodiments of the present application, the first tab further comprises a lead-out part, the first body part comprises a first surface, the coated area and the non-coated area are arranged on the first surface, the lead-out part is connected to the first surface and protrudes relative to the first surface, and the lead-out part is electrically connected to the main body.

[0012] According to some embodiments of the present application, the first tab further comprises a lead-out part, the first body part comprises a first surface and a first peripheral surface, the first peripheral surface surrounds the periphery connected to the first surface, the coated area and the non-coated area are arranged on the first surface, the lead-out part is connected to the first peripheral surface and protrudes relative to the first surface, and the lead-out part is electrically connected to the main body.

[0013] According to some embodiments of the present application, the lead-out portion comprises a first segment and a second segment, two ends of the first segment are connected to the first body portion and the second segment respectively, wherein the thickness of the first segment is less than the thickness of the second segment.

[0014] According to some embodiments of the present application, the diameter of the non-coated area is D1, 4mm≤D1≤10mm.

[0015] According to some embodiments of the present application, the diameter of the hollow area is D2, D1≥D2.

[0016] According to some embodiments of the present application, the thickness of the first insulating layer is T, 10μm≤T≤20μm.

[0017] According to some embodiments of the present application, the diameter of the first tab is D3, the diameter of the main body is D4, 2mm≤D4-D3≤4mm.

[0018] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be understood by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be further described below in combination with the drawings and embodiments, wherein:

[0020] Figure 1 is a schematic view of the battery of the present application;

[0021] Figure 2 is a schematic view of the first tab of the first embodiment of the present application;

[0022] Figure 3 is a schematic view of the first tab of the second embodiment of the present application;

[0023] Figure 4 is a schematic view of the first tab of the third embodiment of the present application;

[0024] Figure 5 is a top view of the first tab of the fourth embodiment of the present application.

[0025] REFERENCE NUMERALS:

[0026] Housing 10; storage cavity 101; battery cell 20; hollow area 201; main body 100; first tab 200; first body portion 210; first surface 211; coated area 212; non-coated area 213; first outer peripheral surface 214; groove 215; first insulating layer 220; lead-out portion 230; first segment 231; second segment 232. DETAILED DESCRIPTION

[0027] The embodiments of the present application will be described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used merely for the purpose of explaining the present application, and should not be construed in a limiting sense regarding the present application.

[0028] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as a limitation of the present application.

[0029] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0030] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0031] In the description of the present application, the description of the reference terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] Among numerous battery types, cylindrical batteries are favored by consumers for their excellent space utilization, stable structural stability, and flexibility in battery assembly. This design not only enables the battery to release more energy in a limited space, but also its excellent deformation resistance helps to stabilize the battery performance in the long run, reducing the risk of failure caused by physical damage. However, while ensuring battery performance, ensuring the safety of the battery is also an important challenge in battery design, especially inside the battery, the negative tab and the positive tab must maintain good insulation state. Once the negative tab and the positive tab inside the battery come into contact, it may trigger an internal short circuit, which in turn causes the battery to overheat, degrade in performance, or even cause a safety accident.

[0033] In some related technologies, in order to effectively prevent battery short circuit, the existing method is to set an insulating gasket between the negative tab and the cell body to achieve insulation between the two. Although the insulating gasket can provide isolation for the negative tab and the cell body, due to the gap that may exist between the insulating gasket and the negative tab, i.e., the insulating gasket and the cell body cannot be completely sealed, which to some extent causes the insulating gasket to occupy a part of the internal space of the battery, thereby limiting the energy density of the battery.

[0034] Therefore, it is necessary to design a battery which can reduce the size of the insulating gasket and the internal space occupied by the insulating component to improve the energy density of the battery while maintaining the insulation between the negative tab and the cell body.

[0035] Based on the above problems, the present application proposes a battery which aims to solve the problems existing in the related art to some extent.

[0036] Reference Figures 1 to 5 , mainly with reference to Figure 1 According to the battery of the embodiment of the present application, the battery includes a shell 10 and a cell 20. The shell 10 has a storage cavity 101, and the cell 20 is arranged in the storage cavity 101. The cell 20 includes a main body 100 and a first tab 200. The first tab 200 includes a first body part 210 and a first insulating layer 220. The first insulating layer 220 is coated on the first body part 210. The first insulating layer 220 is arranged between the main body 100 and the first body part 210, and one side of the first insulating layer 220 is attached to the main body 100. The first body part 210 is electrically connected to the main body 100, and the side of the first body part 210 opposite to the first insulating layer 220 is electrically connected to the shell 10.

[0037] The battery has the advantages that the battery has high energy density.

[0038] Further, in the application, the first insulation layer 220 is coated on the first body part 210, the first insulation layer 220 and the first body part 210 form an integral structure, and the first insulation layer 220 and the first body part 210 can be said to be seamlessly connected in fact, that is, the first insulation layer 220 covers the entire range of the required insulation part of the first body part 210. Compared with the insulation mode of the related art using an insulation pad, the first insulation layer 220 of the application is not prone to displacement, and the insulation reliability can be further improved.

[0039] In addition, compared with the insulation pad, the material of the first insulation layer 220 can adopt various materials, for example, the first insulation layer 220 can be a PET (polyethylene terephthalate) composite material, mica, a ceramic coating layer, etc. Exemplarily, ceramic can be used as the material of the first insulation layer 220. Since the first insulation layer 220 of ceramic material has a pore structure, the liquid retention amount of the battery cell 20 can be increased, and the chemical performance of the battery cell 20 is improved to a certain extent. At the same time, the existence of the ceramic coating layer can effectively inhibit the side reaction between the electrode and the electrolyte during the high-temperature cycle of the battery, thereby reducing the generation of the solid electrolyte interface film (SEI film), improving the cycle performance and high-temperature performance of the battery, and further improving the overall performance and safety of the battery.

[0040] According to some embodiments of the present application, the battery cell 20 further comprises a connecting piece and a second tab (not shown), the second tab comprising a second body portion and a second insulating layer, the second insulating layer being coated on the second body portion, the second insulating layer being arranged between the main body 100 and the second body portion, and one side of the second insulating layer being attached to the main body 100, the second body portion being electrically connected to the main body 100, and the side of the second body portion opposite to the second insulating layer being electrically connected to the connecting piece.

[0041] In the present application, as an example, the first tab 200 is a negative tab, and the second tab is a positive tab, and the second tab is arranged substantially the same as the first tab 200. That is, the second tab comprises a second body portion and a second insulating layer, wherein the second insulating layer is coated on the second body portion, and the other side of the second insulating layer is connected (attached) to the main body 100, that is, in the present application, the insulation of the second tab and the main body 100 can be achieved by coating the second insulating layer on the second body portion, which can not need to use an insulating gasket. In the prior art, since the insulating gasket and the tab are separate components, the insulating gasket is placed between the battery cell main body 100 and the tab to insulate the battery cell main body 100 and the tab, and there is a gap between the insulating gasket and the battery cell main body 100 and between the insulating gasket and the tab, which can result in a low energy density of the battery, while in the present application, the second insulating layer is coated on the second body portion, which can effectively avoid the gap between the second insulating layer and the second body portion, thereby improving the energy density of the battery. Therefore, the battery of the present application can have a high energy density.

[0042] According to some embodiments of the utility model, the electric core 20 is provided with a hollow area 201, the first body part 210 includes a coating area 212 and a non-coating area 213, the first insulating layer 220 is coated in the coating area 212, and the position of the non-coating area 213 corresponds to the position of the hollow area 201. The electric core 20 includes a winding structure (the electric core main body 100) wound by positive and negative electrode sheets, and the electric core main body 100 is formed with a gap (i.e. the hollow area 201 of the application) at the middle part. When the shell 10 and the negative electrode tab are welded and fixed, the laser needs to pass through the hollow area 201 from the top of the electric core main body 100 (i.e. the end of the electric core main body 100 away from the negative electrode tab) to laser weld and fix the negative electrode tab below and the shell 10. Therefore, coating the first insulating layer 220 on the coating area 212 of the first body part 210 can ensure good insulation effect between the first tab 200 and the electric core main body 100. Aligning the non-coating area 213 (i.e. the subsequent welding area) of the first body part 210 with the hollow area 201 of the electric core main body 100 can facilitate the subsequent welding step. Specifically, since the hollow area 201 of the electric core main body 100 is at the approximate center position of the electric core main body 100, during welding, welding operation is performed on the welding area corresponding to the center position, which can avoid adverse welding phenomena such as welding misalignment or virtual welding, to a certain extent, avoid welding abnormalities, and further improve the cycle stability and use safety of the battery.

[0043] According to some embodiments of the utility model, the first tab 200 further includes a lead-out part 230, the first body part 210 includes a first surface 211, the coating area 212 and the non-coating area 213 are both arranged on the first surface 211, the lead-out part 230 is connected to the first surface 211 and protrudes relative to the first surface 211, and the lead-out part 230 is electrically connected to the main body 100.

[0044] In the related art, since an insulating gasket is arranged between the negative electrode tab and the electric core main body 100, the negative electrode tab needs to bypass the insulating gasket to be electrically connected to the negative electrode sheet in the electric core main body 100, which on the one hand will cause the insulating gasket and the tab to occupy too much space, causing waste of internal space of the battery and reducing the energy density of the battery, and on the other hand will also cause the negative electrode tab to be too long, making it easy to contact the shell 10 and cause the risk of short circuit.

[0045] Referring to Figure 2 , Figure 3, based on the above problems, a structure design of the present application is to lead out the lead-out portion 230 from the first surface 211 of the first body portion 210. That is, the first body portion 210 includes the first surface 211 provided with the coated area 212 and the non-coated area 213, the lead-out portion 230 is connected with the first surface 211 and protrudes relative to the first surface 211 to be inserted into the battery cell body 100 to be electrically connected with the negative electrode sheet. That is, the lead-out portion 230 is led out from the first surface 211 of the coated area 212, and the first insulating layer 220 is coated on both sides of the lead-out position. Thus, compared with the insulating gasket of the related art, the first insulating layer 220 occupies a smaller internal space of the battery under the premise of ensuring the insulation effect, thereby improving the energy density of the battery.

[0046] According to some embodiments of the present application, the first tab 200 further includes a lead-out portion 230, the first body portion 210 includes a first surface 211 and a first peripheral surface 214, the first peripheral surface 214 surrounds the periphery connected to the first surface 211, the coated area 212 and the non-coated area 213 are arranged on the first surface 211, the lead-out portion 230 is connected to the first peripheral surface 214 and protrudes relative to the first surface 211, and the lead-out portion 230 is electrically connected to the body 100.

[0047] Referring to Figure 4 , Figure 5 Another structure design of the present application is to lead out the lead-out portion 230 from the first peripheral surface 214 of the first body portion 210. For the lead-out position of the lead-out portion 230, the above effects can be achieved by leading out from the first surface 211 or by leading out from the first peripheral surface 214, that is, the first insulating layer 220 occupies a smaller internal space of the battery, thereby improving the energy density of the battery. As for which lead-out structure to use in actual use, it can be determined according to the specific structure of the battery cell 20 or specific needs.

[0048] Referring to Figure 4 According to some embodiments of the present application, the lead-out portion 230 includes a first section 231 and a second section 232, the two ends of the first section 231 are respectively connected to the first body portion 210 and the second section 232, and the thickness of the first section 231 is less than the thickness of the second section 232. Specifically, the lead-out portion 230 can be an integral structure with the first body portion 210, for example Figure 2 as shown, by opening a groove 215 (first section 231) in the current-carrying material forming the first tab 200, the thickness of the material at the groove 215 is less than the thickness of the second section 232, so as to facilitate the bending of the lead-out portion 230 relative to the first body portion 210, and facilitate the insertion of the lead-out portion 230 into the battery cell body 100 to be electrically connected with the negative electrode sheet of the battery cell body 100.

[0049] In addition, the slotting width of the groove 215 can be set between 2mm and 3mm, thereby being able to ensure that the lead-out portion 230 can be easily bent corresponding to the first body portion 210, and being able to ensure the connection strength between the first body portion 210 and the lead-out portion 230, further improving the stability and safety of the battery.

[0050] According to some embodiments of the present application, the diameter of the non-coating area 213 is D1, and 4mm≤D1≤10mm. Since the hollow area 201 of the battery cell body 100 is the approximate center position of the battery cell body 100, when welding, the laser passes through the hollow area 201 of the battery cell body 100, and the negative electrode tab and the shell 10 are welded and connected in the non-coating area 213 (welding area) of the first tab 200.

[0051] In the present application, the non-coating area 213 (welding area) is circular as an example. Generally speaking, the size of the welding area should not be too large or too small. If the welding area is too large, it will cause excessive welding between the negative electrode tab and the shell 10, resulting in waste of materials and processes. If the welding area is too small, it will cause the negative electrode tab and the shell 10 to be prone to false welding, welding misalignment and other adverse phenomena, resulting in that they cannot be firmly connected, and further causing the battery to be abnormal. Therefore, in the present application, the diameter of the non-coating area 213 (welding area) is set between 4mm and 10mm, for example, 4mm, 6mm, 8mm, 10mm, etc., which can not only ensure the effective welding and fixation between the negative electrode tab and the shell 10, but also save materials and processing time and avoid waste.

[0052] According to some embodiments of the present application, the diameter of the hollow area 201 is D2, and D1≥D2. As described above, since the hollow area 201 of the battery cell body 100 is the approximate center position of the battery cell body 100, when welding, welding operation is performed in the non-coating area 213 (welding area) corresponding to the center position, which can avoid adverse welding phenomena such as welding misalignment or false welding. Therefore, by setting the diameter D1 of the non-coating area 213 (welding area) to be greater than the diameter D2 of the hollow area 201, it can avoid the misoperation of contacting the coating area 212 and the like during the welding process, and improve the welding accuracy.

[0053] According to some embodiments of the present application, the thickness of the first insulation layer 220 is T, and 10 μm≤T≤20 μm. Specifically, the thickness of the first insulation layer 220 should not be set too thick or too thin. If the thickness is too thick, the first insulation layer 220 will occupy too much internal space of the battery, reducing the energy density of the battery. If the thickness is too thin, the first insulation layer 220 will not be able to provide sufficient insulation effect between the battery body 100 and the first tab 200, and the insulation effect cannot be guaranteed. This may cause the first tab 200 to contact the positive plate inside the battery body 100 and short circuit, and further cause the battery 20 to be abnormal. Therefore, in this application, the thickness of the first insulation layer 220 is set between 10 μm and 20 μm, for example, 10 μm, 12 μm, 14 μm, 16 μm, 18 μm, 20 μm, etc. This can greatly reduce the internal space of the battery occupied by the first insulation layer 220 while ensuring good insulation effect, thereby improving the energy density of the battery.

[0054] According to some embodiments of the present application, the diameter of the first tab 200 is D3, the diameter of the body 100 is D4, and 2 mm≤D4-D3≤4 mm. Specifically, the diameter D4 of the battery body 100 is set to be slightly larger than the diameter D3 of the first tab 200, for example, the diameter D4 of the battery body 100 is greater than the diameter D3 of the first tab 200 by 2 mm, 3 mm, 4 mm, etc. In this way, the installation and welding of the battery body 100 and the first tab 200 can be facilitated, and the overall structure and aesthetics of the battery can be improved.

[0055] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery, characterized by, The application relates to a battery cell. The battery cell comprises a shell having a storage cavity, and an electric core arranged in the storage cavity. The electric core comprises a main body and a first tab, the first tab comprising a first body part and a first insulating layer, the first insulating layer being coated on the first body part, the first insulating layer being arranged between the main body and the first body part, one side of the first insulating layer being attached to the main body, the first body part being electrically connected to the main body, and the side of the first body part opposite to the first insulating layer being electrically connected to the shell.

2. The battery of claim 1, wherein, The electric core further comprises a connecting piece and a second tab, the second tab comprising a second body part and a second insulating layer, the second insulating layer being coated on the second body part, the second insulating layer being arranged between the main body and the second body part, one side of the second insulating layer being attached to the main body, the second body part being electrically connected to the main body, and the side of the second body part opposite to the second insulating layer being electrically connected to the connecting piece.

3. The battery of claim 1, wherein, The electric core is provided with a hollow region, the first body part comprises a coated region and a non-coated region, the first insulating layer being coated on the coated region, and the position of the non-coated region corresponding to the position of the hollow region.

4. The battery of claim 3, wherein, The first tab further comprises a lead-out part, the first body part comprises a first surface, the coated region and the non-coated region being arranged on the first surface, the lead-out part being connected to the first surface and protruding relative to the first surface, and the lead-out part being electrically connected to the main body.

5. The battery of claim 3, wherein, The first tab further comprises a lead-out part, the first body part comprises a first surface and a first peripheral surface, the first peripheral surface surrounding the periphery connected to the first surface, the coated region and the non-coated region being arranged on the first surface, the lead-out part being connected to the first peripheral surface and protruding relative to the first surface, and the lead-out part being electrically connected to the main body.

6. The battery according to claim 4 or 5, characterized in that, The lead-out part comprises a first segment and a second segment, two ends of the first segment being connected to the first body part and the second segment respectively, wherein the thickness of the first segment is smaller than the thickness of the second segment.

7. The battery of claim 3, wherein, The diameter of the non-coated region is D1, 4mm<=D1<=10mm.

8. The battery of claim 7, wherein, The diameter of the hollow region is D2, D1>=D2.

9. The battery of claim 1, wherein, The thickness of the first insulating layer is T, 10um<=T<=20um.

10. The battery of claim 1, wherein, The diameter of the first tab is D3, the diameter of the main body is D4, and 2mm<=D4-D3<=4mm.

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