Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and an electric equipment. The battery monomer comprises a shell assembly, a pole core arranged in the shell assembly, and a plurality of pole pieces. Two ends of each pole piece are respectively provided with a tab and a slitting edge. The plurality of pole pieces are divided into first pole pieces and second pole pieces with opposite polarities. The first pole pieces and the second pole pieces are arranged in sequence. The tabs of the first pole pieces and the tabs of the second pole pieces are located on different sides of the pole core. The tabs on the same side are electrically connected with a first connecting surface of a connecting piece. On the same side of the pole core, the distance between the first connecting surface and the slitting edge is L. The number of pole pieces with the same polarity is n. The number of bending layers of the tab is m. The thickness of the battery monomer is T. The thickness of the pole piece is t. The battery monomer satisfies the following relationship: 0.5 <= N = (L-5-0.1*T / 2) / (n*m*t) <= 15. Thus, the tab can have a good state after being bent, and the safety and reliability of the battery monomer are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery monomer, a battery device and an electric equipment. BACKGROUND

[0002] Among all energy forms, electric energy is the most easily used, the most clean and environmental protection and the most efficient energy, and the battery is the best device for storing electric energy. The battery is widely used in people's daily life and has a pivotal influence on people's life. With the gradual development of battery technology, the battery with good performance is increasingly pursued. In the prior art, the pole piece of the battery is usually connected with the inner lead-out sheet and the pole by the tab, so that the battery can supply power to the outside. The bending state of the tab will directly affect the quality of the battery. If the bending space of the tab of the battery is unreasonable, the overall quality of the battery will be poor, and there is room for improvement. SUMMARY

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a battery monomer, which can ensure that the tab has a good state after bending to avoid the root of the tab extruding the slitting edge of the opposite pole piece after bending, thereby improving the safety and reliability of the battery monomer.

[0004] The battery monomer according to the embodiments of the present application comprises: a shell assembly; a pole core provided in the shell assembly, the pole core comprising a plurality of pole pieces, each of the pole pieces being provided with a tab and a slitting edge at two ends respectively, the plurality of pole pieces being divided into first pole pieces and second pole pieces with opposite polarities, the first pole pieces and the second pole pieces being arranged in sequence, the tabs of the first pole pieces and the tabs of the second pole pieces being located at different sides of the pole core; the tabs located at the same side being electrically connected with a first connecting surface of a connecting piece, the distance between the first connecting surface and the slitting edge at the same side of the pole core being L, the number of the pole pieces with the same polarity being n, the number of bending layers of the tab being m, the thickness of the battery monomer being T, the thickness of the pole piece being t, and the battery monomer satisfying the following relationship: 0.5≤N=(L-5-0.1*T / 2) / (n*m*t)≤15.

[0005] According to the battery monomer of the embodiments of the present application, by limiting the distance between the first connecting surface and the slitting edge at the same side within the above range, it can be ensured that the tab has a good state after bending to avoid the root of the tab extruding the slitting edge of the opposite pole piece after bending, thereby improving the safety and reliability of the battery monomer, and the space utilization of the battery monomer can be ensured, thereby improving the quality of the battery monomer.

[0006] According to the battery monomer of some embodiments of the present application, the number of bending layers of the tab is 1≤m≤3.

[0007] The battery cell according to some embodiments of the present application has a length H in a range of 400mm≤H≤1500mm.

[0008] The battery cell according to some embodiments of the present application has a width W in a range of 80mm≤W≤240mm.

[0009] The battery cell according to some embodiments of the present application has a thickness T in a range of 10mm≤T≤40mm.

[0010] The battery cell according to some embodiments of the present application has the tabs of the polar pieces of opposite polarity located on both sides of the polar core in the length direction of the polar core.

[0011] The battery cell according to some embodiments of the present application has the polar core including two first surfaces oppositely arranged, the area of the first surface being greater than the area of the rest of the surfaces of the polar core; and the battery cell further includes two insulating films, each of the two insulating films being attached to one of the two first surfaces.

[0012] The battery cell according to some embodiments of the present application has the side edges of the two insulating films on the same side in the width direction of the polar core being connected by overlapping to insulate and separate the polar core from the housing assembly.

[0013] The battery cell according to some embodiments of the present application has the polar core provided with second surfaces oppositely arranged in the width direction of the polar core, the second surfaces being provided with adhesive members, each of the adhesive members having an overlapping area with each of the insulating films.

[0014] The battery cell according to some embodiments of the present application has the width of the polar core being W and the thickness of the polar core being T; in the parallel direction of the width of the polar core, the width of the insulating film is W2, satisfying: W+T≤W2≤W+2T.

[0015] The battery cell according to some embodiments of the present application has the housing assembly including a housing body and a cover plate, both ends of the housing body being provided with the cover plates in the length direction of the polar core to define a receiving cavity for placing the polar core, each of the cover plates being provided with a polar post.

[0016] The battery cell according to some embodiments of the present application further includes a spacer ring located between the inner side of the cover plate and the end of the polar core, the spacer ring including a support portion abutting against the polar core, both sides of the tab being provided with the support portion in the width direction of the polar core.

[0017] The battery cell according to some embodiments of the present application, in a direction parallel to the width direction of the pole core, the width of the pole core is set as W, the support width of the support part is set as L4, and L4≤1 / 3W is satisfied.

[0018] The present application further provides a battery device.

[0019] The battery device according to embodiments of the present application comprises a box body, and a plurality of battery cells according to any of the above embodiments, which are arranged in the box body.

[0020] The battery device according to embodiments of the present application can ensure that the tab has a good state after being bent, so as to avoid the tab root from pressing the slitting edge of the shaped pole piece after being bent, improve the safety and reliability of the battery cell, ensure the space utilization of the battery cell, improve the quality of the battery cell, and improve the reliability of the battery device.

[0021] The present application further provides an electric device.

[0022] The electric device according to embodiments of the present application comprises the battery device according to any of the above embodiments.

[0023] The electric device according to embodiments of the present application can ensure that the tab has a good state after being bent, so as to avoid the tab root from pressing the slitting edge of the shaped pole piece after being bent, improve the safety and reliability of the battery cell, ensure the space utilization of the battery cell, improve the quality of the battery cell, improve the reliability of the battery device, and improve the overall performance of the electric device.

[0024] Additional aspects and advantages of the present application will be given, partially in the following description, partially become obvious from the following description, or be understood by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0026] Figure 1 is a structural schematic view of a battery cell according to embodiments of the present application;

[0027] Figure 2 is an installation sectional view of a pole core according to embodiments of the present application;

[0028] Figure 3 is an installation sectional view of a connecting piece according to embodiments of the present application;

[0029] Figure 4 is a cross-sectional view of a battery cell according to an embodiment of the present application;

[0030] Figure 5 is a schematic view of installation of an insulation film according to an embodiment of the present application;

[0031] Figure 6 is an exploded view of a battery cell according to an embodiment of the present application;

[0032] Figure 7 is a table of test data of a battery cell according to an embodiment of the present application.

[0033] Reference Signs:

[0034] a battery cell 100,

[0035] a housing assembly 1, a housing body 11, a cover plate 12, a pole 13,

[0036] a pole core 2, a pole sheet 21, a first pole sheet 211, a second pole sheet 212, a pole tab 22, a slitting edge 23, a first surface 24, a second surface 25, a connecting piece 3, a first connecting surface 31, an insulation film 4, a side edge 41, a spacer 5, a support portion 51. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example, embodiments in which like numerals indicate like elements or components, and in which:

[0038] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description, and therefore cannot be construed as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application. In addition, features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0040] Hereinafter, a battery cell 100 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0041] like Figures 1-7 As shown, the battery cell 100 according to the embodiment of the present invention is characterized by comprising: a shell assembly 1 and a pole core 2; the pole core 2 is arranged in the shell assembly 1, the pole core 2 includes a plurality of pole pieces 21, each pole piece 21 is provided with a pole ear 22 and a cutting edge 23 at both ends, the plurality of pole pieces 21 are divided into a first pole piece 211 and a second pole piece 212 with opposite polarities, the first pole piece 211 and the second pole piece 212 are arranged in sequence, and the pole ear 22 of the first pole piece 211 and the pole ear 22 of the second pole piece 212 are positioned opposite to each other. On different sides of the pole core 2; the pole ear 22 located on the same side is electrically connected to the first connecting surface 31 of the connector 3. On the same side of the pole core 2, the spacing between the first connecting surface 31 and the cutting edge 23 is L, the number of pole pieces 21 with the same polarity is n, the number of bending layers of the pole ear 22 is m, the thickness of the battery cell 100 is T, the thickness of the pole piece 21 is t, and the battery cell 100 satisfies the following relationship: 0.5≤N=(L-5-0.1*T / 2) / (n*m*t)≤15.

[0042] In this way, the tab 22 can be ensured to be in good condition after bending, so as to avoid the root of the tab 22 squeezing the cutting edge 23 of the opposite pole piece 21 after bending, thereby improving the safety and reliability of the battery cell 100, and ensuring the space utilization of the battery cell 100, thereby improving the quality of the battery cell 100.

[0043] For example, refer to Figures 1-4As shown, the battery monomer 100 is provided with a shell assembly 1 and a pole core 2, the shell assembly 1 is configured as a square structure and is formed with a receiving cavity, the pole core 2 is installed in the receiving cavity of the shell assembly 1, and a pole 13 is arranged on the shell assembly 1, which can penetrate the shell assembly 1 in the thickness direction to extend into the receiving cavity and be arranged opposite to the pole core 2. The pole core 2 includes a plurality of pole pieces 21, both ends of each pole piece 21 are respectively a grinding cut edge and a split cut edge 23, and a pole lug 22 is connected to the grinding cut edge. The plurality of pole pieces 21 are divided into first pole pieces 211 and second pole pieces 212 with opposite polarities, for example, the first pole pieces 211 can be negative pole pieces and the second pole pieces 212 can be positive pole pieces, the plurality of first pole pieces 211 and the plurality of second pole pieces 212 are arranged in sequence and insulated from each other, that is, arranged in the order of first pole piece 211, second pole piece 212, first pole piece 211, and second pole piece 212. The pole lug 22 of the first pole piece 211 and the pole lug 22 of the second pole piece 212 are located on different sides of the pole core 2, so that the pole lug 22 of the pole piece 21 with opposite polarities is located on different sides, so that the pole lug 22 of the pole piece 21 with opposite polarities can be arranged staggered, thereby avoiding electrical connection between the pole pieces 21 with opposite polarities.

[0044] Meanwhile, a connecting piece 3 can be arranged on the side wall of the shell assembly 1, one side of the connecting piece 3 is electrically connected with the pole 13 and the other side is formed with a first connecting surface 31, the first connecting surface 31 can be attached to the pole lug 22 located on one side of the pole core 2, so that the pole core 2 can be electrically connected with the pole 13 through the pole lug 22 and the connecting piece 3, so that the battery monomer 100 can supply power to the outside through the pole 13. It should be noted that the pole lug 22 is arranged in a bent manner, so that the pole lug 22 can be in large-area contact with the first connecting surface 31.

[0045] Among them, on the same side of the pole core 2, the distance between the first connecting surface 31 and the split cut edge 23 can be L, the number of pole pieces 21 with the same polarity (such as positive pole pieces or negative pole pieces) can be n, the number of bending layers of the pole lug 22 can be m, the thickness of the battery monomer 100 can be T, and the thickness of the pole piece 21 can be t. The battery monomer 100 satisfies the following relationship: 0.5≤N=(L-5-0.1*T / 2) / (n*m*t)≤15.

[0046] That is, the distance L between the first connecting surface 31 and the slitting edge 23 on the same side thereof can be set to be greater than or equal to the sum of 0.5 times a reference coefficient and 0.05 times the thickness of the core 2 and 5 mm, and less than or equal to the sum of 15 times the reference coefficient and 0.05 times the thickness of the battery cell 100 and 5 mm. The reference coefficient is the product of the sum of the thicknesses of a plurality of polar pieces 21 of the same polarity and the number of bending layers of the tab 22. In this way, the distance L between the first connecting surface 31 and the slitting edge 23 on the same side thereof can be limited within a certain range, and the tab 22 can be ensured to have a good state after bending to avoid the root of the tab 22 from being pressed against the slitting edge 23 of the polar piece 21 after bending, thereby improving the safety and reliability of the battery cell 100 and ensuring the space utilization of the battery cell 100. Thus, the quality of the battery cell 100 can be improved.

[0047] Specifically, in the test data table of the battery cell of the application, Figure 7 As shown in test data 1, the number of positive polar pieces can be set to 37 and the thickness to 0.013 mm, the number of negative polar pieces can be set to 38 and the thickness to 0.006 mm, the thickness of the battery cell 100 is 13.5 mm, the number of bending layers of the tab 22 is 3, the distance between the slitting edge 23 of the negative polar piece and the first connecting surface 31 on the corresponding side is set to 8.81 mm, and the distance between the slitting edge 23 of the positive polar piece and the first connecting surface 31 on the corresponding side is set to 9 mm. At this time, the coefficient N corresponding to the positive polar piece is 2.17, and the coefficient N corresponding to the negative polar piece is 4.86, so the coefficient satisfies the above specified range, and the bending state of the tab 22 is good.

[0048] As shown in test data 2, the number of positive polar pieces can be set to 37 and the thickness to 0.013 mm, the number of negative polar pieces can be set to 38 and the thickness to 0.006 mm, the thickness of the battery cell 100 is 13.5 mm, the number of bending layers of the tab 22 is 3, the distance between the slitting edge 23 of the negative polar piece and the first connecting surface 31 on the corresponding side is set to 5.9 mm, and the distance between the slitting edge 23 of the positive polar piece and the first connecting surface 31 on the corresponding side is set to 6 mm. At this time, the coefficient N corresponding to the positive polar piece is 0.16, and the coefficient N corresponding to the negative polar piece is 0.47, so the coefficient is less than the above specified range, the slitting edge 23 is too close to the connecting piece 3, the tab 22 is excessively pressed by the connecting piece 3, and short circuiting is easy to occur.

[0049] As shown in the test data 3, the number of the positive electrode sheet can be set to 37 and the thickness to 0.013 mm, the number of the negative electrode sheet can be set to 38 and the thickness to 0.006 mm, the thickness of the battery monomer 100 is 13.5 mm, the number of the bending layers of the tab is 3, the interval between the slitting edge 23 of the negative electrode sheet and the first connecting surface 31 of the corresponding side is set to 27.78 mm, and the interval between the slitting edge 23 of the positive electrode sheet and the first connecting surface 31 of the corresponding side is set to 17.5 mm. At this time, the coefficient N corresponding to the positive electrode sheet is 15.32, and the coefficient N corresponding to the negative electrode sheet is 17.29, so the coefficient is greater than the above-mentioned specified range, the slitting edge 23 is too far away from the connecting piece 3, and the space utilization rate is low.

[0050] As shown in the test data 4, the number of the positive electrode sheet can be set to 54 and the thickness to 0.013 mm, the number of the negative electrode sheet can be set to 55 and the thickness to 0.006 mm, the thickness of the battery monomer 100 is 19.6 mm, the number of the bending layers of the tab 22 is 3, the interval between the slitting edge 23 of the negative electrode sheet and the first connecting surface 31 of the corresponding side is set to 9.11 mm, and the interval between the slitting edge 23 of the positive electrode sheet and the first connecting surface 31 of the corresponding side is set to 9 mm. At this time, the coefficient N corresponding to the positive electrode sheet is 1.49, and the coefficient N corresponding to the negative electrode sheet is 4.58, so the coefficient meets the above-mentioned specified range, and the bending state of the tab 22 is good.

[0051] As shown in the test data 5, the number of the positive electrode sheet can be set to 54 and the thickness to 0.013 mm, the number of the negative electrode sheet can be set to 55 and the thickness to 0.006 mm, the thickness of the battery monomer 100 is 19.6 mm, the number of the bending layers of the tab 22 is 3, the interval between the slitting edge 23 of the negative electrode sheet and the first connecting surface 31 of the corresponding side is set to 6.57 mm, and the interval between the slitting edge 23 of the positive electrode sheet and the first connecting surface 31 of the corresponding side is set to 6.28 mm. At this time, the coefficient N corresponding to the positive electrode sheet is 0.28, and the coefficient N corresponding to the negative electrode sheet is 0.45, so the coefficient is less than the above-mentioned specified range, the slitting edge 23 is too close to the connecting piece 3, the tab 22 is excessively pressed by the connecting piece 3, and is easy to short circuit.

[0052] As shown in the test data 6, the number of the positive electrode sheet can be set to 54 and the thickness to 0.013 mm, the number of the negative electrode sheet can be set to 55 and the thickness to 0.006 mm, the thickness of the battery monomer 100 is 19.6 mm, the number of the bending layers of the tab 22 is 3, the interval between the slitting edge 23 of the negative electrode sheet and the first connecting surface 31 of the corresponding side is set to 38 mm, and the interval between the slitting edge 23 of the positive electrode sheet and the first connecting surface 31 of the corresponding side is set to 17.5 mm. At this time, the coefficient N corresponding to the positive electrode sheet is 15.2, and the coefficient N corresponding to the negative electrode sheet is 16.7, so the coefficient is greater than the above-mentioned specified range, the slitting edge 23 is too far away from the connecting piece 3, and the space utilization rate is low.

[0053] According to the battery cell 100 of the embodiment of the present invention, by limiting the distance between the first connecting surface 31 and the cutting edge 23 of the pole piece 21 on the same side thereof to the above-mentioned range, it can be ensured that the pole tab 22 is in a good state after bending, so as to avoid the root of the pole tab 22 squeezing the cutting edge 23 of the opposite pole piece 21 after bending, thereby improving the safety and reliability of the battery cell 100, ensuring the space utilization of the battery cell 100, and improving the quality of the battery cell 100.

[0054] In some embodiments of the present invention, the number of bending layers of the tab 22 is 1≤m≤3. Figures 2-3 As shown, the number of bending layers of the tab 22 can be set to 1; alternatively, the number of bending layers of the tab 22 can be set to 2; alternatively, the number of bending layers of the tab 22 can be set to 3, and this application does not impose any restrictions on this. Through the above-mentioned configuration, it is possible to avoid excessive stress on the connector 3 due to an excessive number of layers, reduce the impact of the connector 3 on the cutting edge 23 of the pole piece 21 with opposite polarity, and improve the reliability of the battery cell 100.

[0055] In some embodiments of the present invention, the length H of the battery cell 100 is 400 mm ≤ H ≤ 1500 mm. Figure 4 As shown, the length of the battery cell 100 can be set to H. The length H of the battery cell 100 can be set to 600 mm; or the length H of the battery cell 100 can be set to 950 mm; or the length H of the battery cell 100 can be set to 1300 mm; or the length H of the battery cell 100 can be set to any value that satisfies the conditions, and this application does not impose any restrictions on this.

[0056] The above configuration can prevent the battery cell 100 from being too long, thereby improving the structural stability of the battery cell 100 , and can prevent the battery cell 100 from being too short, thereby improving the energy density of the battery cell 100 and enhancing the practicality of the battery cell 100 .

[0057] In some embodiments of the present invention, the width W of the battery cell 100 is 80 mm ≤ W ≤ 240 mm. Figure 4 As shown, the width W of the battery cell 100 can be set to 100 mm; alternatively, the width W of the battery cell 100 can be set to 160 mm; alternatively, the width W of the battery cell 100 can be set to 220 mm; alternatively, the width W of the battery cell 100 can be set to any value that satisfies the conditions, and this application does not impose any restrictions on this. Through the above settings, the width of the battery cell 100 can be prevented from being too large, thereby improving the structural stability of the battery cell 100, and the width of the battery cell 100 can be prevented from being too small, thereby improving the energy density of the battery cell 100.

[0058] In some embodiments of the present invention, the thickness T of the battery cell 100 is 10 mm ≤ T ≤ 40 mm. Figure 2 As shown, the thickness T of the battery cell 100 can be set to 15 mm; alternatively, the thickness T of the battery cell 100 can be set to 25 mm; alternatively, the thickness T of the battery cell 100 can be set to 35 mm; alternatively, the thickness T of the battery cell 100 can be set to any value that satisfies the conditions, and this application does not impose any restrictions on this. Through the above settings, it is possible to avoid the battery cell 100 being too thick and affecting the heat dissipation performance of the battery cell 100, and to avoid the battery cell 100 being too thin and affecting the structural stability of the battery cell 100, thereby improving the practicality of the battery cell 100.

[0059] In some embodiments of the present invention, the pole tabs 22 of the pole pieces 21 with opposite polarities are located on both sides of the pole core 2 in the length direction of the pole core 2. For example, referring to Figure 4 As shown, the two ends of the electrode sheet 21 along the length direction of the electrode core 2 can be respectively set as the first end and the second end, and the electrode column 13 can be respectively provided at the two ends of the shell assembly 1 along the length direction. The electrode tab 22 of the positive electrode sheet and the cutting edge 23 of the negative electrode sheet are provided at one end of the electrode core 2 along the length direction, and the electrode tab 22 of the positive electrode sheet can be electrically connected to the electrode column 13 at the corresponding end. The electrode tab 22 of the negative electrode sheet and the cutting edge 23 of the positive electrode sheet are provided at the other end of the electrode core 2 along the length direction, and the electrode tab 22 of the negative electrode sheet can be electrically connected to the electrode column 13 at the corresponding end. Through the above arrangement, the probability of short circuit of the battery cell 100 can be reduced, and the reliability and practicality of the battery cell 100 can be improved.

[0060] In some embodiments of the present invention, the pole core 2 includes two first surfaces 24 arranged opposite to each other, and the area of ​​the first surface 24 is larger than the area of ​​the other surfaces of the pole core 2; the battery cell 100 also includes two insulating films 4, and the two insulating films 4 are respectively attached to the two first surfaces 24.

[0061] For example, refer to Figures 5-6 As shown, the opposite side surfaces of the pole core 2 along the thickness direction can be set as the first surface 24, and the area of ​​the first surface 24 is larger than the area of ​​the remaining surfaces of the pole core 2. The battery cell 100 can be provided with two insulating films 4, which are configured as thermal composite films. The two insulating films 4 are respectively adhered to the two first surfaces 24, and the ends of the two insulating films 4 along the width direction can be connected by an insulating member (such as an insulating connecting film), so that the insulating film 4 can surround the pole core 2 and insulate the pole core 2 from the shell assembly 1. At the same time, the insulating film 4 can be used to be bonded to the inner circumferential wall of the shell assembly 1, so that the pole core 2 can be adhered to the shell assembly 1 through the insulating film 4.

[0062] It can be understood that by gluing the insulating film 4 to the first surface 24 , the installation stability of the insulating film 4 can be improved, and the connection area between the shell assembly 1 and the pole core 2 can be increased, thereby improving the installation stability of the battery cell 100 .

[0063] In some embodiments of the present invention, in the width direction of the pole core 2 , the side edges 41 of the two insulating films 4 on the same side are overlapped and connected to insulate and separate the pole core 2 from the shell assembly 1 .

[0064] For example, refer to Figures 5-6 As shown, the width of the insulating film 4 can be set to be larger than the width of the pole core 2, so that the two ends of the insulating film 4 along the width direction can respectively extend to the two side surfaces of the pole core 2 along the width direction. The side edges 41 of the two insulating films 4 extending to the same side surface of the pole core 2 along the width direction can be overlapped and connected, so that the two insulating films 4 can be fixed around the circumferential outer side of the pole core 2 to insulate the pole core 2 from the housing assembly 1. This helps reduce the number of parts in the battery cell 100, reduces processing costs, and can improve the insulation performance of the battery cell 100, thereby enhancing the reliability of the battery cell 100.

[0065] In some embodiments of the present invention, the pole core 2 is provided with a second surface 25 opposite to the pole core 2 in the width direction thereof. The second surface 25 is provided with an adhesive. The adhesive has an overlapping area with each insulating film 4 .

[0066] For example, refer to Figures 5-6 As shown, the side surfaces of the electrode core 2 along the width direction can be set as second surfaces 25. The two second surfaces 25 are arranged opposite each other. The side edges 41 of the insulating film 4 attached to the first surface 24 can extend to a position directly opposite the second surface 25. At least the portions of the side edges 41 of the two insulating films 4 extending to the second surface 25 do not overlap. An adhesive is provided on the second surface 25. The adhesive has an overlapping area with each insulating film 4. The adhesive can be respectively bonded to the side edges 41 of the two insulating films 4 to fix the side edges 41 of the two insulating films 4 to the second surface 25. This helps to improve the installation stability of the insulating films 4 and enhances the reliability of the battery cell 100.

[0067] In some embodiments of the present invention, the width of the pole core 2 is set to W, and the thickness of the pole core 2 is set to T; in the width direction parallel to the pole core 2, the width of the insulating film 4 is set to W2, satisfying: W+T≤W2≤W+2T.

[0068] For example, refer to Figures 5-6As shown, the width of the pole core 2 can be set as W, and the thickness of the pole core 2 can be set as T. In the width direction parallel to the pole core 2, the width of the insulating film 4 can be set as W2, and the following condition is met: W+T≤W2≤W+2T. That is, the width W2 of the insulating film 4 can be set to be greater than or equal to the sum of the thickness T of the pole core 2 and the width W of the pole core 2, and when the insulating film 4 is attached to the first surface 24 of the pole core 2, the side edge 41 of the insulating film 4 can extend to the side of the pole core 2 in the width direction, and the size of the side edge 41 of the insulating film 4 extending to the side of the pole core 2 in the width direction is greater than or equal to 1 / 2T, so that the side edges 41 of the two insulating films 4 extending to the same side of the pole core 2 in the width direction are in contact or have overlapping parts, so that the side edges 41 of the two insulating films 4 can be connected by overlapping.

[0069] At the same time, the width W2 of the insulating film 4 can be set to be less than or equal to the sum of the thickness T of the pole core 2 and twice the width W of the pole core 2, so that the size of the side edge 41 of the insulating film 4 extending to the side of the pole core 2 in the width direction is less than or equal to T, and the side edge 41 of the insulating film 4 can be prevented from extending to the other first surface 24, which is beneficial to reduce the installation difficulty of the insulating film 4. Therefore, it is beneficial to reduce the installation difficulty of the battery monomer 100, and the practicability of the battery monomer 100 is improved.

[0070] In some embodiments of the present application, the shell assembly 1 includes a shell body 11 and a cover plate 12, and both ends of the shell body 11 in the length direction of the pole core 2 are provided with the cover plate 12 to define a containing cavity for placing the pole core 2, and each cover plate 12 is provided with a pole 13.

[0071] For example, referring to Figure 6 As shown, the shell assembly 1 includes a shell body 11 and a cover plate 12, the shell body 11 is configured as a square cylindrical shape, and both ends of the shell body 11 in the length direction are respectively formed with an open port, and two cover plates 12 are provided, and the two cover plates 12 are respectively arranged on the two open ports of the shell body 11 to close the open ports, so that the shell body 11 and the cover plates 12 define a sealed containing cavity, and the pole core 2 is arranged in the containing cavity, and each cover plate 12 is provided with a pole 13, and the pole 13 penetrates the cover plate 12 in the thickness direction, and the pole 13 is used for electrically connecting with the tab 22 of the pole piece 21 of the same polarity, so that the pole core 2 can supply power to the outside. Through the above arrangement, it is beneficial to reduce the processing difficulty of the battery monomer 100, and the reliability of the battery monomer 100 is improved.

[0072] In some embodiments of the present application, as Figure 6 As shown, the battery monomer 100 according to the embodiments of the present application further includes a partition ring 5, the partition ring 5 is located between the inner side of the cover plate 12 and the end of the pole core 2, the partition ring 5 includes a support portion 51 abutting against the pole core 2, and the two sides of the tab 22 in the width direction of the pole core 2 are both provided with the support portion 51.

[0073] For example, referring toFigure 6 As shown, the battery monomer 100 can be provided with a grommet 5, the material of the grommet 5 is provided as an elastic insulating material such as rubber, the grommet 5 is designed in a shape following the open mouth of the shell body 11, and the grommet 5 is used to be mounted between the inner side of the cover plate 12 (i.e. the side facing the accommodating cavity) and the end of the pole core 2, so that the grommet 5 can insulate and separate the cover plate 12 and the pole core 2 to avoid short circuit of the battery monomer 100. At the same time, the grommet 5 can be provided with a support part 51 on the side facing the pole core 2, the support part 51 is configured as a protruding block structure, and the grommet 5 is provided with a support part 51 at each end in the width direction of the pole core 2, and the two support parts 51 are respectively located at the two sides of the tab 22 and are used to be supported on the end face of the pole core 2. Therefore, the support part 51 can avoid the tab 22 and effectively limit the pole core 2, thereby improving the installation stability of the pole core 2.

[0074] In some embodiments of the present application, in the width direction parallel to the pole core 2, the width of the pole core 2 is W, and the support width of the support part 51 is L4, which satisfies: L4≤1 / 3W.

[0075] For example, referring to Figure 4 As shown, the width of the pole core 2 can be W, and in the width direction parallel to the pole core 2, the support width of the support part 51 can be L4, which satisfies: L4≤1 / 3W. That is, the width of the support part 51 can be less than or equal to one-third of the width of the pole core 2, the sum of the widths of the two support parts 51 is less than or equal to two-thirds of the width of the pole core 2, the two support parts 51 are arranged apart and define an avoiding space, the avoiding space is used to avoid the tab 22 of the pole core 2, and the width of the avoiding space is greater than or equal to one-third of the width of the pole core 2. Therefore, enough space can be reserved for the arrangement of the tab 22, the installation difficulty of the tab 22 is reduced, and the reliability of the battery monomer 100 is improved.

[0076] The present application also provides a battery device.

[0077] The battery device according to the embodiments of the present application comprises: a box body and a plurality of battery monomers 100, the battery monomer 100 is the battery monomer 100 of any of the above embodiments, and the plurality of battery monomers 100 are arranged in the box body.

[0078] For example, the battery device can be provided with a box body and a plurality of battery monomers 100, the box body can be configured as a square structure, the box body is formed with a mounting cavity, the plurality of battery monomers 100 are mounted in the mounting cavity, and the plurality of battery monomers 100 can be arranged in sequence or arranged apart, and the plurality of battery monomers 100 are used for synchronous charging and discharging, so that the battery module can work stably.

[0079] According to the battery device of the embodiment of the present application, by limiting the distance between the first connecting surface 31 and the slitting edge 23 on the same side of the first connecting surface 31 within the above range, the tab 22 can be ensured to have a good state after being bent, so as to avoid the root of the tab 22 from pressing the slitting edge 23 of the shaped pole piece 21 after being bent, improve the safety reliability of the battery monomer 100, and ensure the space utilization of the battery monomer 100, improve the quality of the battery monomer 100, and improve the reliability of the battery device, and improve the overall performance of the electric device.

[0080] The application further provides an electric device.

[0081] The electric device of the embodiment of the present application comprises the battery device according to any one of the above embodiments.

[0082] According to the electric device of the embodiment of the present application, by limiting the distance between the first connecting surface 31 and the slitting edge 23 on the same side of the first connecting surface 31 within the above range, the tab 22 can be ensured to have a good state after being bent, so as to avoid the root of the tab 22 from pressing the slitting edge 23 of the shaped pole piece 21 after being bent, improve the safety reliability of the battery monomer 100, and ensure the space utilization of the battery monomer 100, improve the quality of the battery monomer 100, and improve the reliability of the battery device, and improve the overall performance of the electric device.

[0083] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection 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 mean 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.

[0084] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell (100), characterized in that: include: Housing assembly (1); A pole core (2), the pole core (2) being arranged in the housing assembly (1), the pole core (2) comprising a plurality of pole pieces (21), each pole piece (21) being provided with a pole ear (22) and a cutting edge (23) at both ends thereof, the plurality of pole pieces (21) being divided into a first pole piece (211) and a second pole piece (212) having opposite polarities, the first pole piece (211) and the second pole piece (212) being arranged in sequence, the pole ear (22) of the first pole piece (211) and the pole ear (22) of the second pole piece (212) being located on different sides of the pole core (2); The pole tabs (22) located on the same side are electrically connected to the first connecting surface (31) of the connector (3); on the same side of the pole core (2), the spacing between the first connecting surface (31) and the cutting edge (23) is L and the unit is mm; the number of pole pieces (21) with the same polarity is n; the number of bending layers of the pole tabs (22) is m; the thickness of the battery cell (100) is T and the unit is mm; the thickness of the pole piece (21) is t and the unit is mm; the battery cell (100) satisfies the following relationship: 0.5≤N=(L-5-0.1*T / 2) / (n*m*t)≤15.

2. The battery cell (100) according to claim 1, characterized in that The number of bending layers of the tab (22) is 1≤m≤3.

3. The battery cell (100) according to claim 1, characterized in that The length H of the battery cell (100) is 400 mm ≤ H ≤ 1500 mm.

4. The battery cell (100) according to claim 3, characterized in that The width W of the battery cell (100) is 80 mm ≤ W ≤ 240 mm.

5. The battery cell (100) according to claim 4, characterized in that The thickness T of the battery cell (100) is set to 10 mm ≤ T ≤ 40 mm.

6. The battery cell (100) according to any one of claims 1 to 5, characterized in that: The pole ears (22) of the pole pieces (21) with opposite polarities are located on both sides of the pole core (2) in the length direction of the pole core (2).

7. The battery cell (100) according to claim 6, characterized in that: The pole core (2) comprises two first surfaces (24) arranged opposite to each other, and the area of ​​the first surfaces (24) is larger than the area of ​​the remaining surfaces of the pole core (2); The battery cell (100) further comprises two insulating films (4), and the two insulating films (4) are respectively attached to the two first surfaces (24).

8. The battery cell (100) according to claim 7, characterized in that: In the width direction of the pole core (2), the side edges (41) of the two insulating films (4) on the same side are overlapped and connected to insulate and separate the pole core (2) from the shell assembly (1).

9. The battery cell (100) according to claim 7, characterized in that: In the width direction of the pole core (2), the pole core (2) is provided with a second surface (25) arranged opposite to the pole core, and the second surface (25) is provided with an adhesive, and the adhesive has an overlapping area with each of the insulating films (4).

10. The battery cell (100) according to claim 8, characterized in that The width of the pole core (2) is set to W, and the thickness of the pole core (2) is set to T; In a width direction parallel to the pole core (2), the width of the insulating film (4) is set to W2, satisfying: W+T≤W2≤W+2T.

11. The battery cell (100) according to claim 7, characterized in that: The housing assembly (1) comprises a housing body (11) and a cover plate (12). In the length direction of the pole core (2), the cover plates (12) are provided at both ends of the housing body (11) to define a receiving cavity for placing the pole core (2), and each cover plate (12) is provided with a pole column (13).

12. The battery cell (100) according to claim 11, characterized in that Also includes: A spacer (5), the spacer (5) being located between the inner side of the cover plate (12) and the end of the pole core (2), the spacer (5) comprising a support portion (51) abutting against the pole core (2), and support portions (51) being provided on both sides of the pole lug (22) in the width direction of the pole core (2).

13. The battery cell (100) according to claim 12, characterized in that: In a width direction parallel to the pole core (2), the width of the pole core (2) is set to W, and the support width of the support portion (51) is set to L4, satisfying: L4≤1 / 3W.

14. A battery device, characterized in that: include: Box; A plurality of battery cells (100), wherein the battery cells (100) are the battery cells (100) according to any one of claims 1 to 13, and the plurality of battery cells (100) are arranged in the box.

15. An electrical device, characterized in that: Comprising a battery device according to claim 14.

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