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 and a pole core. The pole core is arranged in the shell assembly. The pole core comprises a plurality of pole pieces. Two ends of each pole piece are respectively provided with a pole lug and a slitting edge. The plurality of pole pieces are divided into first pole pieces and second pole pieces which are arranged in sequence and have opposite polarities. The pole lug of the first pole piece and the pole lug of the second pole piece are located at different sides of the pole core. The pole lugs located at the same side are electrically connected with a first connecting surface of a connecting piece through a transition 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 the pole pieces with the same polarity is n. The number of bending layers of the pole lug is m. The number of bending layers of the transition piece is m1. The overall thickness of the transition piece is t1. 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) / <=15. Therefore, 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 pole lug, so that the battery can supply power to the outside. The bending state of the pole lug will directly affect the quality of the battery. If the bending space of the pole lug 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 has low installation difficulty and can ensure that the pole lug has a good state after bending to avoid the root of the pole lug 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 embodiment 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 pole lug 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 pole lug of the first pole piece and the pole lug of the second pole piece being located at different sides of the pole core; the pole lugs located at the same side being electrically connected with a first connecting surface of a connecting piece through a transition 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 pole lug being m, the number of bending layers of the transition piece being m1, the overall thickness of the transition piece being t1, 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) / ≤15.

[0005] The battery monomer according to the embodiment of the present application, by providing the pole lug connected with the connecting piece through the transition piece, can reduce the installation difficulty of the battery monomer, and by limiting the distance between the first connecting surface and the slitting edge at the same side within the above range, can ensure that the pole lug has a good state after bending to avoid the root of the pole lug extruding the slitting edge of the opposite pole piece after bending, thereby improving the safety and reliability of the battery monomer, and can also ensure the space utilization of the battery monomer, thereby improving the quality of the battery monomer.

[0006] The battery cell according to some embodiments of the present application, the number of bending layers m of the tab is 1≤m≤3; and / or the number of bending layers m1 of the transition sheet is 1≤m1≤3.

[0007] The battery cell according to some embodiments of the present application, the length H of the battery cell is 400mm≤H≤1500mm.

[0008] The battery cell according to some embodiments of the present application, the width W of the battery cell is 80mm≤W≤240mm.

[0009] The battery cell according to some embodiments of the present application, the thickness T of the battery cell is 10mm≤T≤40mm.

[0010] The battery cell according to some embodiments of the present application, in the length direction of the pole core, the tabs of the pole pieces with opposite polarities are located on both sides of the pole core.

[0011] The battery cell according to some embodiments of the present application, the pole core comprises two oppositely arranged first surfaces, the area of the first surface is larger than the area of the remaining surfaces of the pole core; the battery cell further comprises two insulating films, and the two insulating films are respectively attached to the two first surfaces.

[0012] The battery cell according to some embodiments of the present application, in the width direction of the pole core, the side edges of the same side of the two insulating films are connected by lapping to insulate and separate the pole core from the shell assembly.

[0013] The battery cell according to some embodiments of the present application, in the width direction of the pole core, the pole core is provided with oppositely arranged second surfaces, the second surfaces are provided with adhesive members, and the adhesive members have overlapping areas with each of the insulating films.

[0014] The battery cell according to some embodiments of the present application, the width of the pole core is W1, and the thickness of the pole core is T1; in the parallel direction of the width of the pole core, the width of the insulating film is W2, and W1+T1≤W2≤W1+2T1 is satisfied.

[0015] The battery cell according to some embodiments of the present application, the shell assembly comprises a shell body and a cover plate, in the length direction of the pole core, both ends of the shell body are provided with the cover plates to define a receiving cavity for placing the pole core, and each cover plate is provided with a pole column.

[0016] The battery cell according to some embodiments of the present application further comprises a spacer ring located between the inner side of the cover plate and the end of the pole core, the spacer ring comprising a supporting portion abutting against the pole core, and the supporting portion is provided on both sides of the tab in the width direction of the pole core.

[0017] The battery cell according to some embodiments of the present application, in the width direction parallel to the pole core, the width of the pole core is W1, and the supporting width of the supporting portion is L4, and L4≤1 / 3W1 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, by arranging the tab to be connected to the connecting member through the transition piece, can reduce the installation difficulty of the battery cell, and by limiting the distance between the first connecting surface and the slitting edge on the same side within the above range, can ensure that the tab has a good state after being bent, so as to avoid the root of the tab extruding the slitting edge of the special-shaped pole piece after being bent, improve the safety and reliability of the battery cell, and also 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, by arranging the tab to be connected to the connecting member through the transition piece, can reduce the installation difficulty of the battery cell, and by limiting the distance between the first connecting surface and the slitting edge on the same side within the above range, can ensure that the tab has a good state after being bent, so as to avoid the root of the tab extruding the slitting edge of the special-shaped pole piece after being bent, improve the safety and reliability of the battery cell, and also ensure the space utilization of the battery cell, improve the quality of the battery cell, and improve the overall performance of the electric device.

[0024] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood by considering the following detailed description, from which the singular features of the application can be understood to provide advantages that will become apparent from consideration of the application as a whole, with reference to the drawings in which:

[0026] Figure 1 is a structural schematic diagram of a battery monomer according to an embodiment of the present application;

[0027] Figure 2 is an installation sectional view of a connecting piece according to an embodiment of the present application;

[0028] Figure 3 is a sectional view of a battery monomer according to an embodiment of the present application;

[0029] Figure 4 is an installation schematic diagram of an insulation film according to an embodiment of the present application;

[0030] Figure 5 is an exploded view of a battery monomer according to an embodiment of the present application;

[0031] Figure 6 is a test data table of a battery monomer according to an embodiment of the present application.

[0032] Reference signs:

[0033] battery monomer 100,

[0034] housing assembly 1, housing body 11, cover plate 12, pole post 13,

[0035] pole core 2, pole sheet 21, first pole sheet 211, second pole sheet 212, pole lug 22, slitting edge 23, first surface 24, second surface 25, connecting piece 3, first connecting surface 31, insulation film 4, side edge 41, spacer 5, support part 51, transition sheet 6. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are for the purpose of explanation only, and are not to be understood as limiting the present application.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0038] 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.

[0039] Hereinafter, a battery cell 100 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0040] like Figures 1-6 As shown, a battery cell 100 according to an embodiment of the present invention includes: 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, the pole ear 22 of the first pole piece 211 and the pole ear 22 of the second pole piece 212 are located on different sides of the pole core 2; the pole ear 22 located on the same side is connected by a The transition piece 6 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 number of bending layers of the transition piece 6 is m1, the overall thickness of the transition piece 6 is t1, 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+m1*t1)≤15.

[0041] Therefore, the installation difficulty of the battery monomer 100 can be reduced, and the tab 22 can have a good state after being bent to avoid the root of the tab 22 pressing the slitting edge 23 of the opposite polar plate 21 after being bent, thereby improving the safety and reliability of the battery monomer 100.

[0042] For example, referring to Figures 1-3 As 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 forms an accommodating cavity, the pole core 2 is installed in the accommodating cavity of the shell assembly 1, and a pole 13 is arranged on the shell assembly 1. The pole 13 can penetrate the shell assembly 1 in the thickness direction to extend into the accommodating cavity and be arranged opposite to the pole core 2. The pole core 2 includes a plurality of polar plates 21, and each polar plate 21 has a grinding edge and a slitting edge 23 at two ends respectively, and the grinding edge is connected with a tab 22. The plurality of polar plates 21 are divided into first polar plates 211 and second polar plates 212 with opposite polarities, for example, the first polar plates 211 are negative polar plates and the second polar plates 212 are positive polar plates, the plurality of first polar plates 211 and the plurality of second polar plates 212 are arranged in sequence and insulated, that is, arranged in the order of first polar plate 211, second polar plate 212, first polar plate 211, and second polar plate 212. The tabs 22 of the first polar plates 211 and the tabs 22 of the second polar plates 212 are located on different sides of the pole core 2, so that the tabs 22 of the polar plates 21 with opposite polarities are located on different sides, so that the tabs 22 of the polar plates 21 with opposite polarities can be arranged staggered, thereby avoiding electrical connection between the polar plates 21 with opposite polarities.

[0043] Meanwhile, a connecting piece 3 can be arranged on the shell assembly 1, one side of the connecting piece 3 is electrically connected with the pole 13 and the other side forms a first connecting surface 31, and the tabs 22 located on one side of the pole core 2 can be connected with the first connecting surface 31 through the transition piece 6, so that the pole core 2 can be electrically connected with the pole 13 through the tabs 22, the transition piece 6 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 transition piece 6 and the tab 22 are both arranged in a bent manner, so that the transition piece 6 and the tab 22, and the transition piece 6 and the first connecting surface 31 are in large-area contact.

[0044] In the specific installation process, the transition piece 6 is first welded and connected with the plurality of tabs 22 located on the same side of the pole core 2, and then the transition piece 6 is connected with the first connecting surface 31, so that the pole 13 and the tabs 22 of the plurality of polar plates 21 with the same polarity are connected together. Therefore, the installation difficulty of the battery monomer 100 can be reduced.

[0045] Wherein, on the same side of the pole core 2, the distance between the first connecting surface 31 and the slitting edge 23 on the same side thereof can be set as L, the number of the pole pieces 21 of the same polarity (such as the positive pole pieces or the negative pole pieces) can be set as n, the number of the bending layers of the tab 22 can be set as m, the number of the bending layers of the transition piece 6 can be set as m1, the overall thickness of the transition piece 6 can be set as t1, the thickness of the battery monomer 100 can be set as T, the thickness of the pole piece 21 can be set as t, and the battery monomer 100 satisfies the following relationship: 0.5≤N=(L-5-0.1*T / 2) / (n*m*t+m1*t1)≤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 as greater than or equal to the sum of 0.5 times the reference coefficient plus 0.05 times the thickness of the pole core 2 and 5 mm, and less than or equal to the sum of 15 times the reference coefficient plus 0.05 times the thickness of the battery monomer 100 and 5 mm. Wherein, the reference coefficient is the sum of the thickness of the plurality of pole pieces 21 of the same polarity multiplied by the number of the bending layers of the tab 22 plus the overall thickness of the transition piece 6 multiplied by the number of the bending layers of the transition piece 6. 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 have a good state after bending to avoid the root of the tab 22 pressing the slitting edge 23 of the pole piece 21 after bending, thereby improving the safety and reliability of the battery monomer 100, and ensuring the space utilization of the battery monomer 100. Therefore, the quality of the battery monomer 100 can be improved.

[0047] Specifically, in the test data table of the battery monomer of Figure 6 As shown in test data 1, the number of the positive pole pieces is set as 37 and the thickness is set as 0.013 mm, the number of the negative pole pieces is set as 38 and the thickness is set as 0.006 mm, the thickness of the battery monomer 100 is 13.5 mm, the number of the folding layers of the tab 22 is 2, the number of the folding layers of the transition piece is 2, the overall thickness of the transition piece 6 corresponding to the positive pole piece is set as 0.6 mm, the overall thickness of the transition piece 6 corresponding to the negative pole piece is set as 0.5 mm, the distance between the slitting edge 23 of the negative pole piece and the first connecting surface 31 on the corresponding side is set as 8.81 mm, and the distance between the slitting edge 23 of the positive pole piece and the first connecting surface 31 on the corresponding side is set as 9 mm. At this time, the coefficient N corresponding to the positive pole piece is 1.45, and the coefficient N corresponding to the negative pole piece is 2.28, 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 electrode sheets is set to 37 and the thickness is set to 0.013 mm, the number of negative electrode sheets is set to 38 and the thickness is set to 0.006 mm, the thickness of the battery monomer 100 is 13.5 mm, the folding layer number of the tab 22 is 2, the folding layer number of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 0.6 mm, the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.5 mm, the distance between the slitting edge 23 of the negative electrode sheet and the first connecting surface 31 of the corresponding side is set to 6.5 mm, and the distance between the slitting edge 23 of the positive electrode sheet and the first connecting surface 31 of the corresponding side is set to 6.2 mm. At this time, the coefficient N corresponding to the positive electrode sheet is 0.38, and the coefficient N corresponding to the negative electrode sheet is 0.36, so the coefficient is less than the above-mentioned specified range, the distance between the slitting edge 23 and the connecting piece 3 is too close, the tab 22 is excessively pressed by the connecting piece 3, and short circuit is easy to occur.

[0049] As shown in test data 3, the number of positive electrode sheets is set to 37 and the thickness is set to 0.013 mm, the number of negative electrode sheets is set to 38 and the thickness is set to 0.006 mm, the thickness of the battery monomer 100 is 13.5 mm, the folding layer number of the tab 22 is 2, the folding layer number of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 0.6 mm, the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.5 mm, the distance between the slitting edge 23 of the negative electrode sheet and the first connecting surface 31 of the corresponding side is set to 40 mm, and the distance between the slitting edge 23 of the positive electrode sheet and the first connecting surface 31 of the corresponding side is set to 30 mm. At this time, the coefficient N corresponding to the positive electrode sheet is 15.88, and the coefficient N corresponding to the negative electrode sheet is 16.71, so the coefficient is greater than the above-mentioned specified range, the distance between the slitting edge 23 and the connecting piece 3 is too far, and the space utilization rate is low.

[0050] As shown in test data 4, the number of positive electrode sheets is set to 54 and the thickness is set to 0.013 mm, the number of negative electrode sheets is set to 55 and the thickness is set to 0.006 mm, the thickness of the battery monomer 100 is 19.6 mm, the folding layer number of the tab 22 is 2, the folding layer number of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 1 mm, the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.6 mm, the distance between the slitting edge 23 of the negative electrode sheet and the first connecting surface 31 of the corresponding side is set to 10 mm, and the distance 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 1.18, and the coefficient N corresponding to the negative electrode sheet is 1.62, so the coefficient meets the above-mentioned specified range, and the bending state of the tab 22 is good.

[0051] As shown in test data 5, the number of positive electrode sheets is set to 54 and the thickness is set to 0.013 mm, the number of negative electrode sheets is set to 55 and the thickness is set to 0.006 mm, the thickness of the battery monomer 100 is 19.6 mm, the number of folding layers of the tab 22 is 2, the number of folding layers of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 1 mm, the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.6 mm, the distance between the slitting edge 23 of the negative electrode sheet and the first connecting surface 31 of the corresponding side is set to 7 mm, and the distance between the slitting edge 23 of the positive electrode sheet and the first connecting surface 31 of the corresponding side is set to 6.5 mm. At this time, the coefficient N corresponding to the positive electrode sheet is 0.30, and the coefficient N corresponding to the negative electrode sheet is 0.28, 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 short circuiting is easy.

[0052] As shown in test data 6, the number of positive electrode sheets is set to 54 and the thickness is set to 0.013 mm, the number of negative electrode sheets is set to 55 and the thickness is set to 0.006 mm, the thickness of the battery monomer 100 is 19.6 mm, the number of folding layers of the tab 22 is 2, the number of folding layers of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 1 mm, the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.6 mm, the distance between the slitting edge 23 of the negative electrode sheet and the first connecting surface 31 of the corresponding side is set to 58 mm, and the distance between the slitting edge 23 of the positive electrode sheet and the first connecting surface 31 of the corresponding side is set to 35 mm. At this time, the coefficient N corresponding to the positive electrode sheet is 15.28, and the coefficient N corresponding to the negative electrode sheet is 15.60, 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] As shown in test data 7, the number of positive electrode sheets is set to 65 and the thickness is set to 0.013 mm, the number of negative electrode sheets is set to 66 and the thickness is set to 0.006 mm, the thickness of the battery monomer 100 is 28.2 mm, the number of folding layers of the tab 22 is 2, the number of folding layers of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 1.2 mm, the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.6 mm, the distance between the slitting edge 23 of the negative electrode sheet and the first connecting surface 31 of the corresponding side is set to 13 mm, and the distance between the slitting edge 23 of the positive electrode sheet and the first connecting surface 31 of the corresponding side is set to 13 mm. At this time, the coefficient N corresponding to the positive electrode sheet is 1.61, and the coefficient N corresponding to the negative electrode sheet is 3.31, so the coefficient satisfies the above-mentioned specified range, and the bending state of the tab 22 is good.

[0054] As shown in test data 8, the number of positive electrode sheets is set to 65 and their thickness is set to 0.013 mm, the number of negative electrode sheets is set to 66 and their thickness is set to 0.006 mm, the thickness of the battery cell 100 is 28.2 mm, the number of folded layers of the tab 22 is 2, the number of folded layers of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 1.2 mm, and the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.6 mm. The spacing between the cut edge 23 of the negative electrode sheet and the first connecting surface 31 on the corresponding side is set to 8 mm, and the spacing between the cut edge 23 of the positive electrode sheet and the first connecting surface 31 on the corresponding side is set to 7 mm. In this case, the coefficient N corresponding to the positive electrode sheet is 0.39, and the coefficient N corresponding to the negative electrode sheet is 0.30. These coefficients are less than the specified range. The cut edge 23 is too close to the connector 3, and the tab 22 is excessively squeezed by the connector 3, which can easily cause a short circuit.

[0055] As shown in Experimental Data 9, the number of positive electrode sheets is set to 65 and their thickness is set to 0.013 mm, the number of negative electrode sheets is set to 66 and their thickness is set to 0.006 mm, the thickness of the battery cell 100 is 28.2 mm, the number of folded layers of the tab 22 is 2, the number of folded layers of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 1.2 mm, and the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.6 mm. The spacing between the cutting edge 23 of the negative electrode sheet and the first connecting surface 31 on the corresponding side is set to 70 mm, and the spacing between the cutting edge 23 of the positive electrode sheet and the first connecting surface 31 on the corresponding side is set to 38 mm. In this case, the coefficient N corresponding to the positive electrode sheet is 15.55, and the coefficient N corresponding to the negative electrode sheet is 15.86. These coefficients are greater than the specified range, and the cutting edge 23 is too far from the connector 3, resulting in low space utilization.

[0056] According to the battery cell 100 of the embodiment of the present invention, by providing the pole ear 22 to be connected to the connector 3 through the transition piece 6, the difficulty of installing the battery cell 100 can be reduced, and by limiting the distance between the first connecting surface 31 and the cutting edge 23 on the same side to the above-mentioned range, it can be ensured that the pole ear 22 is in good condition after bending, so as to avoid the root of the pole ear 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 also ensuring the space utilization of the battery cell 100, thereby improving the quality of the battery cell 100.

[0057] In some embodiments of the present invention, the number m of the bending layers of the tab 22 is 1≤m≤3; and / or the number m1 of the bending layers of the transition piece 6 is 1≤m1≤3.

[0058] For example, refer to Figure 2As shown, the number of bending layers m of the tab 22 can be 1; or the number of bending layers m of the tab 22 can be 2; or the number of bending layers m of the tab 22 can be 3, which is not limited in the application. At the same time, the number of bending layers m1 of the transition sheet 6 can be 1; or the number of bending layers m1 of the transition sheet 6 can be 2; or the number of bending layers m1 of the transition sheet 6 can be 3, which is not limited in the application.

[0059] Through the above setting, the excessive stress caused by too many bending layers can be avoided, the influence of the tab 22 and the transition sheet 6 on the slitting edge 23 of the pole piece 21 with opposite polarity is reduced, and the reliability of the battery monomer 100 is improved.

[0060] In some embodiments of the application, the length H of the battery monomer 100 is 400mm≤H≤1500mm. For example, referring to Figure 3 As shown, the length of the battery monomer 100 can be H. Among them, the length H of the battery monomer 100 can be 600mm; or the length H of the battery monomer 100 can be 950mm; or the length H of the battery monomer 100 can be 1300mm; or the length H of the battery monomer 100 can be any value that meets the condition, which is not limited in the application.

[0061] Through the above setting, the length of the battery monomer 100 can be avoided to be too large, the structural stability of the battery monomer 100 is improved, and the length of the battery monomer 100 can be avoided to be too small, which is beneficial to improve the energy density of the battery monomer 100, and the practicability of the battery monomer 100 is improved.

[0062] In some embodiments of the application, the width W of the battery monomer 100 is 80mm≤W≤240mm. For example, referring to Figure 3 As shown, the width W of the battery monomer 100 can be 100mm; or the width W of the battery monomer 100 can be 160mm; or the width W of the battery monomer 100 can be 220mm; or the width W of the battery monomer 100 can be any value that meets the condition, which is not limited in the application. Through the above setting, the width of the battery monomer 100 can be avoided to be too large, the structural stability of the battery monomer 100 is improved, and the width of the battery monomer 100 can be avoided to be too small, which is beneficial to improve the energy density of the battery monomer 100.

[0063] In some embodiments of the application, the thickness T of the battery monomer 100 is 10mm≤T≤40mm. For example, referring to Figure 4As shown, the thickness T of the battery monomer 100 can be 15mm; or the thickness T of the battery monomer 100 can be 25mm; or the thickness T of the battery monomer 100 can be 35mm; or the thickness T of the battery monomer 100 can be any value that meets the condition, and the present application does not limit this. Through the above setting, the thickness of the battery monomer 100 can be avoided to be too large to affect the heat dissipation performance of the battery monomer 100, and the thickness of the battery monomer 100 can be avoided to be too small to affect the improvement of the structural stability of the battery monomer 100, thereby improving the practicability of the battery monomer 100.

[0064] In some embodiments of the present application, the polar ears 22 of the polar sheet 21 with opposite polarity are located on both sides of the polar core 2 in the length direction of the polar core 2. For example, referring to Figure 3 As shown, the two ends of the polar sheet 21 in the length direction of the polar core 2 can be set as the first end and the second end respectively, and the shell assembly 1 can be provided with the polar post 13 at both ends in the length direction, the polar ear 22 of the positive polar sheet and the slitting edge 23 of the negative polar sheet are arranged at one end of the polar core 2 in the length direction, and the polar ear 22 of the positive polar sheet can be electrically connected with the polar post 13 at the corresponding end, and the polar ear 22 of the negative polar sheet and the slitting edge 23 of the positive polar sheet are arranged at the other end of the polar core 2 in the length direction, and the polar ear 22 of the negative polar sheet can be electrically connected with the polar post 13 at the corresponding end. Through the above setting, the probability of short circuit of the battery monomer 100 can be reduced, thereby improving the reliability and practicability of the battery monomer 100.

[0065] In some embodiments of the present application, the polar core 2 includes two oppositely arranged first surfaces 24, and the area of the first surface 24 is greater than that of the remaining surfaces of the polar core 2; the battery monomer 100 further includes two insulating films 4, and the two insulating films 4 are respectively attached to the two first surfaces 24.

[0066] For example, referring to Figures 4-5 As shown, the opposite sides of the polar core 2 in the thickness direction can be set as the first surface 24, and the area of the first surface 24 is greater than that of the remaining surfaces of the polar core 2. The battery monomer 100 can be provided with two insulating films 4, the insulating film 4 can be set as a thermal composite film, the two insulating films 4 can be glued on the two first surfaces 24 respectively, and the ends of the two insulating films 4 in the width direction can be connected by an insulating member (such as an insulating connecting film), so that the insulating film 4 can insulate and separate the polar core 2 and the shell assembly 1 in the circumferential direction of the polar core 2. At the same time, the insulating film 4 can be used for gluing and attaching to the inner circumferential wall of the shell assembly 1, so that the polar core 2 can be glued in the shell assembly 1 through the insulating film 4.

[0067] It can be understood that by gluing the insulating film 4 on 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 polar core 2 can be increased, thereby improving the installation stability of the battery monomer 100.

[0068] 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 .

[0069] For example, refer to Figures 4-5 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.

[0070] 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 .

[0071] For example, refer to Figures 4-5 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.

[0072] In some embodiments of the present invention, the width of the pole core 2 is set to W1, and the thickness of the pole core 2 is set to T1; in the width direction parallel to the pole core 2, the width of the insulating film 4 is set to W2, satisfying: W1+T1≤W2≤W1+2T1.

[0073] For example, refer to Figures 4-5As shown, the width of the pole core 2 can be W1, and the thickness of the pole core 2 can be T1. In the width direction parallel to the pole core 2, the width of the insulating film 4 can be W2, and the following condition is met: W1+T1≤W2≤W1+2T1. 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 T1 of the pole core 2 and the width W1 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 / 2T1, 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 portions, so that the side edges 41 of the two insulating films 4 can be connected by overlapping.

[0074] 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 T1 of the pole core 2 and twice the width W1 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 T1, 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.

[0075] 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.

[0076] For example, referring to Figure 5 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.

[0077] In some embodiments of the present application, as Figure 5 As shown, the battery monomer 100 of the embodiment 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.

[0078] For example, refer to Figure 5 As shown, the battery cell 100 can be provided with a spacer 5. The spacer 5 is made of an elastic insulating material such as rubber. The spacer 5 is designed to conform to the opening of the housing body 11. The spacer 5 is installed 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 spacer 5 can insulate the cover plate 12 and the pole core 2 to prevent short circuits in the battery cell 100. At the same time, a support portion 51 can be formed on the side of the spacer 5 facing the pole core 2. The support portion 51 is configured as a protruding structure. The spacer 5 is provided with a support portion 51 at each end of the pole core 2 in the width direction. The two support portions 51 are respectively located on either side of the pole tab 22 and are used to support the end face of the pole core 2. As a result, the support portion 51 can avoid the pole tab 22 and effectively limit the pole core 2, thereby improving the installation stability of the pole core 2.

[0079] In some embodiments of the present invention, in a width direction parallel to the pole core 2 , the width of the pole core 2 is set to W1 , and the support width of the support portion 51 is set to L4 , satisfying: L4 ≤ 1 / 3 W1 .

[0080] For example, refer to Figure 3 As shown, the width of the electrode core 2 can be set to W1, and the support width of the support portion 51 in a direction parallel to the width of the electrode core 2 can be set to L4, satisfying the following: L4 ≤ 1 / 3W1. In other words, the width of the support portion 51 can be set to be less than or equal to one-third of the width of the electrode core 2, and the sum of the widths of the two support portions 51 can be less than or equal to two-thirds of the width of the electrode core 2. The two support portions 51 are spaced apart and define a clearance space. The clearance space is used to avoid the tab 22 of the electrode core 2, and the width of the clearance space is greater than or equal to one-third of the width of the electrode core 2. This allows sufficient space for the arrangement of the tab 22, reduces the difficulty of installing the tab 22, and improves the reliability of the battery cell 100.

[0081] The present invention also provides a battery device.

[0082] The battery device according to an embodiment of the present invention includes: a box and a plurality of battery cells 100 . The battery cells 100 are the battery cells 100 of any of the above embodiments. The plurality of battery cells 100 are disposed in the box.

[0083] For example, a battery device can be provided with a box body and a plurality of battery cells 100. The box body can be constructed as a square structure, and an installation cavity is formed in the box body. The plurality of battery cells 100 are all installed in the installation cavity, and the plurality of battery cells 100 can be arranged in sequence or spaced apart. The plurality of battery cells 100 are used for synchronous charging and discharging so that the battery module can operate stably.

[0084] According to the battery device of the embodiment of the present application, the tab 22 can be connected to the connecting piece 3 through the transition piece 6, the installation difficulty of the battery monomer 100 can be reduced, and by limiting the interval between the first connecting surface 31 and the slitting edge 23 on the same side within the above range, the tab 22 can have a good state after being bent, so that the root of the tab 22 does not extrude the slitting edge 23 of the different-shaped pole piece 21 after being bent, the safety and reliability of the battery monomer 100 are improved, the space utilization of the battery monomer 100 is ensured, the quality of the battery monomer 100 is improved, the reliability of the battery device is improved, and the overall performance of the electric device is improved.

[0085] The application further provides an electric device.

[0086] The electric device of the embodiment of the present application comprises the battery device according to any one of the above embodiments.

[0087] According to the electric device of the embodiment of the present application, the tab 22 can be connected to the connecting piece 3 through the transition piece 6, the installation difficulty of the battery monomer 100 can be reduced, and by limiting the interval between the first connecting surface 31 and the slitting edge 23 on the same side within the above range, the tab 22 can have a good state after being bent, so that the root of the tab 22 does not extrude the slitting edge 23 of the different-shaped pole piece 21 after being bent, the safety and reliability of the battery monomer 100 are improved, the space utilization of the battery monomer 100 is ensured, the quality of the battery monomer 100 is improved, the reliability of the battery device is improved, and the overall performance of the electric device is improved.

[0088] 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.

[0089] 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) through a transition sheet (6); 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 number of bending layers of the transition sheet (6) is m1; the overall thickness of the transition sheet (6) is t1, and the unit is mm; 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+m1*t 1)≤15.

2. The battery cell (100) according to claim 1, characterized in that The number m of bending layers of the tab (22) is 1≤m≤3; and / or The number m1 of the bending layers of the transition piece (6) is 1≤m1≤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 10 mm ≤ T ≤ 40 mm.

6. The battery cell (100) according to any one of claims 1 to 5, characterized in that: In the length direction of the pole core (2), the pole ears (22) of the pole piece (21) with opposite polarities are located on both sides 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 W1, and the thickness of the pole core (2) is set to T1; In a width direction parallel to the pole core (2), the width of the insulating film (4) is set to W2, satisfying: W1+T1≤W2≤W1+2T1.

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 W1, and the support width of the support portion (51) is set to L4, satisfying: L4≤1 / 3W1.

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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