Battery pole piece and battery

Abstract

The utility model provides a battery pole piece and a battery, relates to battery technical field, the battery pole piece includes a plurality of pole piece portion and connecting portion, the plurality of pole piece portions are arranged at interval in proper order, each pole piece portion includes the pole piece main part and the tab that adjoin each other, the pole piece main body and the tab are connected to each other, and the connecting portion is connected to the pole piece main body. The tabs of each pole piece part are positioned on the same side of the pole piece main body, and the connecting part is positioned between two adjacent tabs and is used for electrically connecting the two adjacent tabs. According to the utility model, when the battery is used for a long time and is vibrated or cold joint occurs between the tabs, the adjacent tabs can still be electrically connected through the connecting parts even if the tabs are separated, so that the electrical connection performance between the tabs is improved, the quality of the battery is improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pole piece and a battery. Background Art

[0002] In existing laminated batteries, the positive and negative electrodes are cut to form single-piece positive and negative electrodes. When the battery is used for a long time, the battery is vibrated, or there is a cold weld in the tab welding area of ​​the electrode, the tab welding area is prone to tab separation, resulting in disconnection between the tabs of different electrodes with the same polarity, resulting in battery failure and affecting battery quality and production efficiency. Utility Model Content

[0003] The utility model provides a battery pole piece and a battery, so as to solve the problem that the pole ears of the existing battery pole pieces are prone to disconnection.

[0004] In a first aspect, the utility model provides a battery electrode, the battery electrode comprises a plurality of electrode parts and a connecting part. The plurality of electrode parts are arranged in sequence and spaced apart, each of the electrode parts comprises an adjacent electrode body and a pole ear, and the pole ear of each electrode part is located on the same side of the electrode body. The connecting part is located between two adjacent pole ears, and is used to electrically connect the two adjacent pole ears.

[0005] In the utility model, when the battery has been used for a long time, is vibrated, or has cold solder joints between the pole ears, even if the pole ears are separated, the adjacent pole ears can still be electrically connected through the connecting parts, thereby improving the electrical connection performance between the pole ears and improving the quality and service life of the battery.

[0006] In some embodiments, the pole ears of at least some of the pole piece portions among the plurality of pole piece portions are located in the middle of the side of the pole piece body.

[0007] In some embodiments, the pole piece body in at least part of the pole piece portion is symmetrically arranged relative to the perpendicular bisector of the side of the pole piece body, and / or, the pole ears in at least part of the pole piece portion are symmetrically arranged relative to the perpendicular bisector of the side of the pole piece body.

[0008] In some embodiments, a first fold is provided at the connection between the pole ear and the connecting portion, and / or a second fold is provided at the middle of the connecting portion along the arrangement direction of the pole piece portion.

[0009] In some embodiments, along the arrangement direction of the plurality of pole pieces, the width of the pole ear is a first width, the width of the connecting portion is a second width, and the ratio of the second width to the first width is in the range of 1-2.

[0010] In some embodiments, the first width is equal to the second width, or the second width is twice the first width.

[0011] In some embodiments, the pole lug includes a connecting end close to the pole piece body and a free end away from the pole piece body, and the connecting portion is located between the connecting end and the free end.

[0012] In some embodiments, along a direction perpendicular to the arrangement direction of the plurality of pole pieces, the length of the pole ear is a first length, the length of the connecting portion is a second length, and the ratio of the second length to the first length is in the range of 0.5-0.9.

[0013] In some embodiments, along a direction perpendicular to an arrangement direction of the plurality of pole pieces, a first interval between the connecting portion and the free end is less than or equal to half of the first length.

[0014] In some embodiments, along a direction perpendicular to the arrangement direction of the plurality of pole pieces, a second interval between the connecting portion and the connecting end is greater than or equal to 1 mm and less than or equal to half of the first length.

[0015] In some embodiments, the junction between the pole ear and the connecting portion is arranged with an arc transition.

[0016] In the second aspect, the utility model provides a battery, comprising a shell and a battery electrode as described in any one of the above items, the battery electrode being accommodated in the shell, the battery electrode being arranged in two, the electrode body of the two battery electrodes being alternately stacked, the electrode body of another battery electrode being spaced between two adjacent electrode bodies of any one of the battery electrodes; the connecting portion of each of the battery electrodes being folded in half and located between two adjacent electrode ears. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a schematic diagram of the structure of a battery electrode provided by an embodiment of the utility model.

[0019] Figure 2 It is a schematic diagram of the structure of the battery cell provided by an embodiment of the utility model.

[0020] Figure 3 It is a side view of a battery cell provided in an embodiment of the utility model.

[0021] Figure 4 It is a side view of a battery cell provided in some embodiments of the present invention.

[0022] Explanation of main figure marks: battery electrode 100; positive electrode 100a; negative electrode 100b; electrode portion 10; electrode body 11; electrode ear 12; connecting end 121; free end 122; first fold 123; first width W1; first length L1; connecting portion 20; second fold 201; second width W2; second length L2; first interval D1; second interval D2; diaphragm 30; electrode material 40.

[0023] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Reference to "embodiment" or "implementation method" herein means that the specific features, structures or characteristics described in conjunction with the embodiment or implementation method may be included in at least one embodiment of the utility model. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] It should be noted that the terms in the specification and claims of the present invention and the above-mentioned drawings are only for describing specific embodiments and are not intended to limit the present invention. The terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order. The term "and / or" used in the specification and claims of the present invention refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0027] See also Figure 1 , Figure 1It is a structural schematic diagram of a battery pole piece 100 provided in an embodiment of the utility model. The battery pole piece 100 includes a plurality of pole piece parts 10 and a connecting part 20. The plurality of pole piece parts 10 are arranged in a linear manner and spaced apart in sequence. Each pole piece part 10 includes a pole piece body 11 and a pole ear 12 arranged adjacent to each other. The pole ear 12 in each pole piece part 10 is located on the same side of the pole piece body 11. The connecting part 20 is located between two adjacent pole ears 12 and is used to electrically connect two adjacent pole ears 12. When the battery has been used for a long time, is vibrated, or there is a cold solder joint between the pole ears 12, even if there is a problem of separation between the pole ears 12, the adjacent pole ears 12 can still be electrically connected through the connecting part 20, thereby improving the electrical connection performance between the pole ears 12 and improving the quality and service life of the battery. Among them, in the utility model, in order to describe more clearly, the X-axis direction is defined as the arrangement direction of the plurality of pole pieces 10.

[0028] The widths of the pole tabs 12 corresponding to different pole pieces 10 along the arrangement direction X of the pole pieces 10 may be the same or different. For example, in this embodiment, the widths of the pole tabs 12 corresponding to different pole pieces 10 along the arrangement direction X of the pole pieces 10 are arranged to be the same. The connection direction of the pole tabs 12 and the pole piece body 11 is arranged to cross the arrangement direction X of the pole piece 10.

[0029] Among them, along the arrangement direction of the pole piece portion 10, the width of the pole ear 12 is smaller than the width of the pole piece body 11, so as to reduce the mass of the pole ear 12 on the basis of having sufficient current flow capacity, thereby reducing the overall mass of the battery pole piece 100, and further improving the energy density of the battery. The pole ears 12 of at least some of the pole pieces 10 in the plurality of pole pieces 10 are located in the middle of the side of the pole piece body 11, so that when the current is transmitted between the pole ear 12 and the pole piece body 11, when the electrons flow to different positions on the pole piece body 11, the flow path is uniform and symmetrical, thereby improving the consistency of the battery pole piece 100.

[0030] Please also read Figure 1 , Figure 2 and Figure 3When the battery pole pieces 100 are assembled into the battery, the battery pole pieces 100 are stacked, and the multiple pole piece parts 10 are stacked in sequence. The connecting part 20 is folded in half and located between two adjacent pole tabs 12. In this embodiment, in each pole piece part 10, the pole tab 12 is located in the middle of the pole piece body 11 along the arrangement direction X of the pole piece part 10, and the mid-perpendicular line C1 of the side of the pole piece body 11 in each pole piece part 10 is aligned with the mid-perpendicular line C2 of the side of the pole tab 12. After the battery pole pieces 100 are stacked, along the stacking thickness direction of the battery pole pieces 100, the mid-perpendicular lines C1 of the pole piece bodies 11 in different pole piece parts 10 are aligned with each other, and the mid-perpendicular lines C2 of the pole tabs 12 are aligned with each other, so as to avoid the problem of misalignment of the pole tabs 12 and improve the welding quality between the pole tabs 12. The perpendicular midline C1 of the pole piece body 11 is located in the middle of the pole piece body 11 along the arrangement direction X of the plurality of pole piece portions 10, and the perpendicular midline C2 of the pole ear 12 is located in the middle of the pole ear 12 along the arrangement direction X of the plurality of pole piece portions 10. In some embodiments, the pole ears 12 in some pole piece portions 10 may be located in the middle of the pole piece body 11 along the arrangement direction X of the pole piece portions 10.

[0031] The pole piece body 11 in at least part of the pole piece portion 10 is symmetrically arranged relative to the mid-perpendicular line C1 of the side of the pole piece body 11, and / or, the pole lug 12 in at least part of the pole piece portion 10 is symmetrically arranged relative to the mid-perpendicular line C1 of the side of the pole piece body 11. In some embodiments, the pole piece body 11 in at least part of the pole piece portion 10 is symmetrical relative to the mid-perpendicular line C1 of the side of the pole piece body 11, so that after the battery pole pieces 100 are stacked, the pole piece bodies 11 of different pole piece portions 10 can be aligned, thereby improving the consistency of the battery pole pieces 100 after stacking. In some embodiments, the pole lug 12 in at least part of the pole piece portion 10 is symmetrical relative to the mid-perpendicular line C1 of the side of the pole piece body 11, so that after the battery pole pieces 100 are stacked, the pole lug 12 of different pole piece portions 10 can be aligned, thereby improving the consistency of the battery pole pieces 100 after stacking, making the welding thickness of each position of the pole lug 12 after welding consistent, and improving the quality and service life of the battery. In some embodiments, in at least part of the pole piece portion 10, the pole piece body 11 and the pole lug 12 are symmetrically arranged relative to the mid-perpendicular line C1 of the side of the pole piece body 11, so that after the battery pole pieces 100 are stacked, the pole lugs 12 and the pole piece bodies 11 of different pole piece portions 10 can be aligned respectively, thereby improving the consistency of the battery pole pieces 100 after stacking, making the welding thickness of each position of the pole lug 12 after welding consistent, thereby improving the quality and service life of the battery.

[0032] In some embodiments, a first fold 123 may be provided at the connection between the pole lug 12 and the connecting portion 20. The first fold 123 may guide the bending of the pole lug 12 and the connecting portion 20 to increase the bending speed of the pole lug 12 and the connecting portion 20, improve production efficiency, and make the bending point of the pole lug 12 and the connecting portion 20 located at the connection between the pole lug 12 and the connecting portion 20. After folding, the connecting portion 20 is flush or approximately flush with the side of the pole lug 12 along the arrangement direction X of the pole piece portion 10, thereby avoiding folding of the pole lug 12 after bending, or excessive protrusion of the connecting portion 20 relative to the pole lug 12 along the arrangement direction X of the pole piece portion 10 after bending, causing the connection portion 20 to be misaligned with the pole lug 12, resulting in uneven thickness of the pole lug 12 after welding, which has an adverse effect on the quality and service life of the battery.

[0033] In some embodiments, a second fold 201 is provided at the middle position of the connecting portion 20 along the arrangement direction X of the pole piece portion 10. The second fold 201 can guide the folding of the connecting portion 20 so that the bent portion of the connecting portion 20 after folding is located at the middle position of the connecting portion 20 along the arrangement direction X of the pole piece portion 10, so as to increase the folding speed of the connecting portion 20, improve production efficiency, and make the lengths of the two parts of the connecting portion 20 on both sides of the bent portion after folding the connecting portion 20 the same or similar, thereby avoiding the problem of unequal lengths of the two parts of the connecting portion 20 on both sides of the bent portion after folding, resulting in uneven thickness after welding the connecting portion 20 and the pole ear 12.

[0034] In some embodiments, a first fold 123 may be provided at the connection between the pole tab 12 and the connecting portion 20, and a second fold 201 may be provided at the middle position of the connecting portion 20 along the arrangement direction X of the pole piece portion 10. When stacking the battery pole pieces 100, the first fold 123 may guide the bending of the pole tab 12 and the connecting portion 20, and the second fold 201 may guide the folding of the connecting portion 20, so that the connecting portion 20 is quickly folded between two adjacent pole tabs 12, thereby improving the folding speed of the connecting portion 20, improving the stacking efficiency of the battery pole pieces 100, and improving the consistency of each connecting portion 20 after folding, so that the folded connecting portion 20 is aligned with the pole tab 12, so that the thickness of the pole tab 12 and the connecting portion 20 after welding is uniform, improving the consistency of the stacked battery pole pieces 100, and improving the product quality and service life of the battery.

[0035] In this embodiment, the pole tabs 12 in different pole piece parts 10 are located on the same side of the pole piece body 11. After the battery pole pieces 100 are stacked, the pole tabs 12 in different pole piece parts 10 can be welded together. The pole piece body 11 and the pole tab 12 can be integrally formed. The connecting portion 20 and the pole tab 12 can be integrally formed. The battery pole piece 100 can be manufactured by, but not limited to, stamping, rolling, cutting, and the like. In some embodiments, the pole piece body 11 and the pole tab 12 can also be separately formed and fixedly connected together by welding, welding, and the like. In some embodiments, the connecting portion 20 and the pole tab 12 can also be separately formed and fixedly connected together by welding, welding, and the like.

[0036] Please also read Figure 1 , Figure 2 and Figure 3 , along the arrangement direction X of the plurality of pole pieces 10, the width of the pole ear 12 is the first width W1, and the width of the connecting portion 20 is the second width W2. The ratio of the second width W2 to the first width W1 ranges from 1 to 2. In the present embodiment, the ratio of the second width W2 to the first width W1 can be set to 2, that is, the second width W2 is twice the first width W1. The ratio of the second width W2 to the first width W1 is set to 2 so that after the connecting portion 20 is folded in half and arranged between two adjacent pole ears 12, on a plane perpendicular to the stacking direction of the pole piece 10, the width of the orthographic projection of the pole ear 12 is similar to or the same as the width of the orthographic projection of the connecting portion 20. When the pole ears 12 of different pole pieces 10 are pressed and welded together, the thickness of each position of the welding area is consistent, thereby improving the connection stability of the pole ears 12 after welding, improving the firmness of the welding, and thus improving the quality and service life of the battery.

[0037] See also Figure 4In some embodiments, the ratio of the second width W2 to the first width W1 can be set to 1, that is, the first width W1 and the second width W2 are equal. After the connecting portion 20 is folded and arranged between two adjacent pole tabs 12, the width of the orthographic projection of the pole tab 12 on the plane perpendicular to the stacking direction of the pole piece 10 is twice the width of the orthographic projection of the connecting portion 20. Since the folding directions of the two adjacent connecting portions 20 are opposite, the orthographic projections of the two adjacent connecting portions 20 are adjacent on the plane perpendicular to the stacking direction of the pole piece 10. In this way, when the pole tabs 12 of different pole pieces 10 are pressed and welded together, on the one hand, the thickness of each position of the welding area of ​​the pole tab 12 can be made consistent, and on the other hand, the overall thickness of the pole tab 12 after welding can be reduced, and the width of the connecting portion 20 can be reduced, thereby reducing the overall mass of the battery pole piece 100 and improving the energy density of the battery. In some embodiments, the ratio of the second width W2 to the first width W1 may also be 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.1, etc. The specific ratio of the second width W2 to the first width W1 can be specifically set by those skilled in the art according to the actual needs of the battery electrode sheet 100, and is not specifically limited in the present invention.

[0038] See also Figure 1 , the pole lug 12 includes a connecting end 121 close to the pole piece body 11 and a free end 122 away from the pole piece body 11. The connecting portion 20 is located between the connecting end 121 and the free end 122. Along the direction perpendicular to the arrangement direction X of the plurality of pole pieces 10, the length of the pole lug 12 is a first length L1, and the length of the connecting portion 20 is a second length L2. The ratio of the second length L2 to the first length L1 is in the range of 0.5-0.9, so that when the pole lug 12 is welded, the pole lug 12 has a sufficient welding area to improve the connection strength between the pole lugs 12 after welding. For example, the ratio of the second length L2 to the first length L1 can be 0.5, 0.6, 0.7, 0.8, 0.9, and so on.

[0039] Along the direction perpendicular to the arrangement direction X of the plurality of pole pieces 10, the interval between the connection portion 20 and the free end 122 is a first interval D1, and the first interval D1 is less than or equal to half of the first length L1. After the battery pole pieces 100 are stacked and welded, due to the existence of assembly errors, the welded pole tabs 12 need to be cut so that the end of the pole tab 12 away from the pole piece body 11 remains flat. Along the direction perpendicular to the arrangement direction X of the pole piece 10, the pole tab 12 is protruded relative to the connection portion 20 in a direction away from the pole piece body 11, so that when the pole tab 12 is cut, the overall thickness at the cutting position can be reduced, the cutting difficulty can be reduced, the flatness after cutting can be improved, and the connection portion 20 can be reduced or avoided from being cut excessively, thereby ensuring sufficient connection stability between the pole tabs 12.

[0040] Along the direction perpendicular to the arrangement direction X of the plurality of pole pieces 10, the interval between the connecting portion 20 and the connecting end 121 is a second interval D2, and the second interval D2 is greater than or equal to 1 mm and less than or equal to half of the first length L1. The connection portion 20 is spaced apart from the pole piece body 11 to avoid interference between the connection portion 20 and the pole piece body 11 when the battery pole pieces 100 are stacked, thereby preventing the electrode material on the pole piece body 11 from falling off.

[0041] In some embodiments, the arc transition is set at the adjacent part between the pole ear 12 and the connecting portion 20 to reduce the stress concentration at the connection between the pole ear 12 and the connecting portion 20 to avoid tearing. In some embodiments, the arc transition is set at the adjacent part between the pole ear 12 and the pole piece body 11 to reduce the stress concentration at the connection between the pole ear 12 and the pole piece body 11 to avoid tearing.

[0042] Please also read Figure 2 and Figure 3 The embodiment of the utility model further provides a battery, the battery comprising a shell (not shown in the figure) and a battery electrode 100 as in any of the above embodiments. The battery electrode 100 is accommodated in the shell. Two battery electrodes 100 are provided, and the electrode body 11 of the two battery electrodes 100 is alternately stacked, and the electrode body 11 of another battery electrode 100 is spaced between two adjacent electrode bodies 11 of any battery electrode 100. The connecting portion 20 of each battery electrode 100 is folded in half and is located between two adjacent pole ears 12. The battery also includes a diaphragm 30 located between two adjacent electrode bodies 11 and an electrode material 40 arranged on the electrode body 11.

[0043] Specifically, the battery electrode 100 includes a positive electrode 100a and a negative electrode 100b. The electrode body 11 of the positive electrode 100a and the electrode body 11 of the negative electrode 100b are alternately stacked, and a diaphragm 30 is provided between each two adjacent electrode bodies 11. The diaphragm 30 can be placed in a Z shape, and a storage space is formed between two adjacent layers of the diaphragm 30. The electrode body 11 of the positive electrode 100a and the electrode body of the negative electrode 100b are alternately placed in different storage spaces. The positive electrode 100a and the negative electrode 100b are stacked to form a battery cell, and the battery cell has a structure of diaphragm 30-electrode body 11 of the positive electrode 100a-diaphragm 30-electrode body 11 of the negative electrode 100b-diaphragm 30.

[0044] In some embodiments, the electrode material 40 can be provided on one side, that is, the electrode material 40 is coated on one side of the pole piece body 11. In some embodiments, the electrode material 40 can be provided on both sides, that is, the electrode material 40 is coated on two opposite surfaces of the pole piece body 11, so as to improve the energy density of the battery.

[0045] Among them, the pole ear 12 of the positive pole sheet 100a and the pole ear of the negative pole sheet 100b can be located at the opposite ends of the shell, that is, the pole ear 12 of the positive pole sheet 100a and the pole ear of the negative pole sheet 100b are located at the opposite ends of the battery cell to avoid a short circuit between the pole ears 12 of the positive pole sheet 100a and the negative pole sheet 100b.

[0046] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A battery electrode, It is characterized in that include: A plurality of pole pieces, wherein the plurality of pole pieces are arranged in sequence and spaced apart from each other, each of the pole pieces comprises an adjacent pole piece body and a pole ear, and the pole ear of each pole piece is located on the same side of the pole piece body; The connecting portion is located between two adjacent pole tabs and is used for electrically connecting the two adjacent pole tabs.

2. The battery electrode according to claim 1, It is characterized in that The pole ears of at least some of the pole pieces among the plurality of pole pieces are located in the middle of the side of the pole piece body.

3. The battery electrode according to claim 1, It is characterized in that The pole piece body in at least part of the pole piece portion is symmetrically arranged relative to the perpendicular midline of the side of the pole piece body, and / or the pole lug in at least part of the pole piece portion is symmetrically arranged relative to the perpendicular midline of the side of the pole piece body.

4. The battery electrode according to claim 1, It is characterized in that A first fold is provided at a connection between the pole ear and the connecting portion, and / or a second fold is provided at a middle portion of the connecting portion along an arrangement direction of the pole piece portion.

5. The battery electrode according to any one of claims 1 to 4, It is characterized in that Along the arrangement direction of the plurality of pole pieces, the width of the pole ear is a first width, the width of the connecting portion is a second width, and the ratio of the second width to the first width is in the range of 1-2.

6. The battery electrode according to claim 5, It is characterized in that The first width is equal to the second width, or the second width is twice the first width.

7. The battery electrode according to claim 1, It is characterized in that The pole ear comprises a connecting end close to the pole piece body and a free end away from the pole piece body, and the connecting portion is located between the connecting end and the free end.

8. The battery pole piece according to claim 7, It is characterized in that Along a direction perpendicular to the arrangement direction of the plurality of pole pieces, the length of the pole ear is a first length, the length of the connecting portion is a second length, and the ratio of the second length to the first length is in the range of 0.5-0.

9.

9. The battery electrode according to claim 8, It is characterized in that Along a direction perpendicular to an arrangement direction of the plurality of pole pieces, a first interval between the connecting portion and the free end is less than or equal to half of the first length.

10. The battery electrode according to claim 8, It is characterized in that Along a direction perpendicular to the arrangement direction of the plurality of pole pieces, a second interval between the connecting portion and the connecting end is greater than or equal to 1 mm and less than or equal to half of the first length.

11. The battery electrode according to claim 1, It is characterized in that The adjacent part between the pole ear and the connecting part is provided with an arc transition.

12. A battery, It is characterized in that include: A shell and a battery electrode as described in any one of claims 1-11, wherein the battery electrode is accommodated in the shell, and the battery electrode is arranged in two, the electrode bodies of the two battery electrodes are alternately stacked, and the electrode body of another battery electrode is spaced between two adjacent electrode bodies of any battery electrode; the connecting portion of each battery electrode is folded in half and located between two adjacent electrode ears.

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