Pole core and battery

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a pole core which comprises a first connecting piece and a core body, and the core body comprises a plurality of pole pieces and a plurality of diaphragms; the multiple first pole pieces are sequentially arranged from the starting end to the ending end in the first direction, the diaphragm is arranged between every two adjacent pole pieces, and each pole piece is provided with a pole lug extending outwards; the plurality of pole pieces are divided into positive pole pieces and negative pole pieces, and the extending ends of the tabs corresponding to the positive pole pieces are bent and then gathered at a first position to form a first connecting end; the first connecting piece is arranged at the first position and is welded with the first connecting end; the distance between the surface, close to the terminating end, of the first connecting piece and the surface, close to the terminating end, of the core body is a, the length of the core body in the first direction is b, and a / b is smaller than or equal to 10%. According to the pole core disclosed by the embodiment of the utility model, the thickness of the pole core and the relative position of the first connecting piece are determined, so that the pole core is smoothly placed into the shell in actual production.

Description

Technical Field

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

[0002] Multi-electrode batteries mainly refer to batteries with multiple lugs connected to the core. Since multi-electrode batteries have more lugs and they are evenly distributed, they have better rate performance and lower temperature rise during charge and discharge.

[0003] Reference Figure 7 and Figure 8 In actual production, the extended ends of multiple pole ears of the same polarity are welded to the same connector to form a welded pole core. The battery shell includes an integrally formed first shell 300 and a second shell 400. The first shell 300 is provided with a first groove, and the second shell 400 is provided with a second groove. The depth of the second groove is greater than the first groove. The welded pole core is placed in the second groove. The first shell 300 is folded along the dotted line in the figure so that the first groove and the second groove are opposite and connected. Before folding, the connector 100 is bent. After the first shell 300 is folded, the connector can extend from the gap between the first shell 300 and the second shell 400.

[0004] like Figure 7 As shown, generally, the connector 100 is bent at the welding area 500 close to itself, and the welding area 500 cannot be bent, otherwise the welding quality of the tab and the connector will be affected. Figure 8 As shown, when the end of the connector 100 close to the welding area 200 is closer to the opening of the second groove, before the first shell 300 is folded, the connector 100 is bent in the same way as above, but after the first shell 300 is folded, due to the upper position of the connector 100, the first shell 300 will squeeze the connector 100, causing the connector 100 to be deformed into the deformed connector 101, thereby affecting the welding quality and making the process of placing the pole core into the shell not smooth. In addition, since the thickness of the winding core affects the thickness of the pole ear and the difficulty of processing, the welding area 500 on the connector 100 cannot be located at the bottom of the second groove.

[0005] However, currently, there is no restriction on the position of the connector relative to the winding core. The connector is easily deformed during the process of placing the pole core into the shell, making it difficult to place the pole core into the shell. Utility Model Content

[0006] The technical problem to be solved by the utility model is that it is difficult to put a pole core into a shell in the prior art, and a pole core and a battery are provided.

[0007] In order to solve the above technical problems, the embodiment of the utility model provides a pole core, comprising a first connecting member and a core body, wherein the core body comprises a plurality of pole pieces and a plurality of diaphragms;

[0008] A plurality of the first pole pieces are arranged in sequence from a starting end to a terminating end along a first direction, the diaphragm is arranged between two adjacent pole pieces, and each pole piece has a pole ear extending outward;

[0009] The plurality of electrode sheets are divided into positive electrode sheets and negative electrode sheets, and the extended ends of the electrode ears corresponding to the positive electrode sheets are bent and gathered at a first position to form a first connection end;

[0010] The first connecting member is arranged at the first position and is welded to the first connecting end;

[0011] The distance between the surface of the first connecting member close to the termination end and the surface of the core close to the termination end is a, the length of the core in the first direction is b, and a / b is less than or equal to 10%.

[0012] Optionally, the plurality of pole pieces are parallel, the plurality of positive pole pieces are divided into a plurality of first pole pieces and two second pole pieces, and the plurality of negative pole pieces are divided into a third pole piece and two fourth pole pieces;

[0013] The first pole piece includes a first substrate and two first active layers, and the two first active layers are arranged on two opposite sides of the first substrate;

[0014] The second pole piece includes a second substrate and a second active layer, and the second active layer is arranged on a first side surface of the second substrate;

[0015] The third pole piece includes a third substrate and two third active layers, and the two third active layers are arranged on two opposite side surfaces of the third substrate;

[0016] The fourth pole piece includes a fourth substrate and a fourth active layer, and the fourth active layer is arranged on a first side surface of the fourth substrate;

[0017] The third substrate and the fourth substrate have the same thickness, and the third active layer and the fourth active layer have the same thickness;

[0018] The plurality of first pole pieces are sequentially arranged from a starting end to a terminating end along a first direction, and two second pole pieces are arranged at two ends of the arrangement direction of the plurality of first pole pieces, and a first side surface of the second pole piece is close to the first pole piece;

[0019] The two fourth pole pieces are arranged in the middle of the arrangement direction of the first pole pieces, the surfaces of the fourth active layers on the two fourth pole pieces are far away from each other, and two layers of diaphragms are arranged between the two fourth pole pieces; a part of the third pole piece is arranged between two adjacent first pole pieces, and another part of the third pole piece is arranged between the first pole piece and the second pole piece;

[0020] Each of the first pole pieces has a first pole lug extending outward, and each of the second pole pieces has a second pole lug extending outward. The extending ends of the first pole lugs and the extending ends of the two second pole lugs are bent and gathered at a first location to form the first connecting end.

[0021] Optionally, each of the third pole pieces has a third pole lug extending outward, each of the fourth pole pieces has a fourth pole lug extending outward, and the extended ends of the plurality of third pole lugs and the extended ends of the two fourth pole lugs are bent and gathered at a second location to form a second connecting end; the first location and the second location are arranged at two ends of the pole core in a second direction, and the second direction is perpendicular to the first direction;

[0022] It also includes a second connecting member, which is arranged at a second location and has a second connecting end welded thereto.

[0023] Optionally, the first pole tab comprises a first first bending section, a first rear bending section and a first welding section connected in sequence, the first first bending section is formed by the first pole tab first bending toward the first location until the protruding end of the first pole tab is located on the side of the first connector close to the terminal end, the first rear bending section is formed by the first pole tab smoothly transitioning toward the surface of the first connector close to the terminal end, and the first welding section is attached to the surface of the first connector;

[0024] The second pole ear includes a second first bending section, a second rear bending section and a second welding section connected in sequence, the second first bending section is formed by the first pole ear being bent toward the first position until the protruding end of the second pole ear is located on the side of the first connecting member close to the terminal end, the second rear bending section is formed by the second pole ear smoothly transitioning toward the surface of the first connecting member close to the terminal end, and the second welding section is attached to the surface of the first connecting member.

[0025] Optionally, the first connecting member has a welding area, the first connecting end is welded at the welding area, and the length of the welding area of ​​the first connecting member is h;

[0026] The design width of the diaphragm is greater than the design width of the first pole piece, and the difference between the design width of the diaphragm and the design width of the first pole piece is c;

[0027] The arc length of the first rear bending section is d;

[0028] Correction coefficient y, y= (5%-10%)a;

[0029] The length of the second electrode tab at the starting end of the first direction is X, where X=c+b+h+d+y.

[0030] Optionally, the two fourth pole tabs are divided into a starting pole tab and a terminating pole tab, the starting pole tab is close to the starting end, and the terminating pole tab is close to the terminating end;

[0031] The length of the first pole ear closest to the starting end=X minus the thickness of the third pole piece minus twice the thickness of the diaphragm minus the thickness of the first pole piece;

[0032] The length of the first pole piece corresponding to the first pole piece arranged between the starting end and the starting pole piece, in the direction from the starting end to the ending end, the length of the next first pole piece = the length of the previous first pole piece minus the thickness of the third pole piece minus twice the thickness of the diaphragm minus the thickness of the first pole piece;

[0033] The length of the first pole ear closest to the terminating pole ear=the length of the first pole ear closest to the starting pole ear minus the thickness of the third pole piece minus the thickness of the third substrate minus 4 times the thickness of the diaphragm;

[0034] The length of the first pole ear corresponding to the first pole piece arranged at the terminating pole ear and the terminating end, in the direction from the starting end to the terminating end, the length of the latter first pole ear = the length of the previous first pole ear minus the thickness of the third pole piece minus twice the thickness of the diaphragm minus the thickness of the first pole piece;

[0035] The length of the second pole tab at the termination end in the first direction=the length of the first pole tab closest to the termination end minus the thickness of the third pole piece minus twice the thickness of the diaphragm minus the thickness of the first pole piece.

[0036] Optionally, the number of first pole pieces arranged between the starting end and the starting pole lug is an even number, and the number of first pole pieces arranged between the terminating pole lug and the terminating end is an even number.

[0037] Optionally, the number of first pole pieces arranged between the starting end and the terminating end is an odd number.

[0038] Optionally, the number of the pole pieces is greater than 30.

[0039] The utility model also provides a battery, comprising the pole core mentioned above.

[0040] According to the pole core and battery of the embodiment of the utility model, the distance between the surface of the first connecting member close to the terminal end and the surface of the core body close to the terminal end is a, the length of the core body in the first direction is b, and a / b is less than or equal to 10%. The relationship between the thickness of the first connecting member and the pole core is determined, so that the distance between the first connecting member and the terminal end of the pole core is equal to 10% of the thickness of the pole core. Through such an arrangement, for pole cores of different thicknesses, the position of the first connecting member that is convenient for winding the core into the shell can be calculated. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is an overall schematic diagram of the pole core provided by the first embodiment of the utility model;

[0042] Figure 2 It is a schematic diagram of the arrangement of the first pole piece of the pole core provided by the first embodiment of the utility model;

[0043] Figure 3 It is a schematic diagram of the relative positions of the edge of the first pole piece of the pole core and the edge of the diaphragm provided in the first embodiment of the utility model;

[0044] Figure 4 It is a schematic structural diagram of a first connecting member of a pole core provided in the first embodiment of the utility model after being bent;

[0045] Figure 5 It is a schematic diagram of the relative lengths of the first pole ear and the second pole ear of the pole core before being bent provided by the first embodiment of the utility model;

[0046] Figure 6 It is an overall schematic diagram of the pole core provided by the second embodiment of the utility model;

[0047] Figure 7 It is the internal structure diagram of a qualified product of the prior art;

[0048] Figure 8 It is a diagram of the internal structure of a defective product of the prior art.

[0049] The reference numerals in the specification are as follows:

[0050] 100, connector; 101, deformed connector; 200, tab; 300, first shell; 400, second shell; 500, welding area; 600, second groove; 700, first groove;

[0051] 11. First pole piece; 12. Second pole piece; 13. Third pole piece; 14. Fourth pole piece; 15. First pole ear; 16. Second pole ear; 2. Diaphragm; 3. First connecting member. DETAILED DESCRIPTION

[0052] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0053] First embodiment

[0054] like Figure 1 and Figure 2 As shown, the pole core provided by the first embodiment of the utility model includes a plurality of pole pieces and a plurality of diaphragms 2; the plurality of pole pieces are parallel to each other, and the diaphragm 2 is arranged between two adjacent pole pieces. Among them, the plurality of pole pieces are divided into positive pole pieces and negative pole pieces, and the plurality of positive pole pieces are divided into a plurality of first pole pieces 11 and two second pole pieces 12. The plurality of negative pole pieces are divided into a plurality of third pole pieces 13 and two fourth pole pieces 14. The number of the first pole pieces 11 and the number of the third pole pieces 13 are the same.

[0055] The first pole piece 11 includes a first substrate and two first active layers, which are arranged on two opposite side surfaces of the first substrate; the second pole piece 12 includes a second substrate and a second active layer, which is arranged on the first side surface of the second substrate.

[0056] The third pole piece 13 includes a third substrate and two third active layers, which are arranged on two opposite side surfaces of the third substrate; the fourth pole piece 14 includes a fourth substrate and a fourth active layer, which is arranged on a first side surface of the fourth substrate.

[0057] In this embodiment, the first substrate and the second substrate have the same thickness, and the first active layer and the second active layer have the same thickness. The third substrate and the fourth substrate have the same thickness, and the third active layer and the fourth active layer have the same thickness;

[0058] Multiple first pole pieces 11 are arranged along a first direction, and two second pole pieces 12 are respectively arranged at both ends of the arrangement direction of the multiple first pole pieces 11. The first side surface of the second pole piece 12 is close to the first pole piece 11, that is, the exposed surface of the second substrate of the second pole piece 12 is away from the first pole piece 11.

[0059] Two fourth pole pieces 14 are arranged in the middle of the arrangement direction of the first pole pieces 11, and the surfaces of the fourth active layers on the two fourth pole pieces 14 are far away from each other, or in other words, the fourth substrates on the two fourth pole pieces 14 are arranged opposite to each other, and two layers of diaphragms 2 are arranged between the two fourth pole pieces 14, while only one layer of diaphragm 2 is arranged between the remaining two adjacent pole pieces; a part of the third pole piece 13 is arranged between the two adjacent first pole pieces 11, and another part of the third pole piece 13 is arranged between the first pole piece 11 and the second pole piece 12. The first direction is the thickness direction of the pole core.

[0060] The separator 2 between the two fourth pole pieces 14 in this embodiment can prevent the negative electrode material from loosening or falling off during the charge and discharge process, and help maintain the electrolyte liquid state in the battery.

[0061] In this embodiment, each first pole piece 11 has a first pole tab 15 extending outward, and each second pole piece 12 has a second pole tab 16 extending outward. The extending ends of the first pole tabs 15 and the extending ends of the two second pole tabs 16 are bent and gathered at a first point to form a first connection end. The first pole tab 15 and the second pole tab 16 are both positive pole tabs.

[0062] Each third pole piece 13 has a third pole lug extending outward, and each fourth pole piece 14 has a fourth pole lug extending outward. The extended ends of the plurality of third pole lugs and the extended ends of the two fourth pole lugs are bent and gathered at the second location to form a second connection end. The third pole lug and the fourth pole lug are both negative pole lugs. In this embodiment, the positions of the third pole lug and the fourth pole lug are not limited, and the bending conditions of the third pole lug and the fourth pole lug are not limited. The third pole lug and the fourth pole lug are adjusted according to actual needs.

[0063] The first location and the second location are arranged at two ends of the second direction of the pole core. Generally, the first location and the second location are arranged near the two side walls of the pole core. The second direction is perpendicular to the first direction.

[0064] In this embodiment, a first connecting member 3 and a second connecting member are also included. The first connecting member 3 is arranged at a first location and a first connecting end is welded; the second connecting member is arranged at a second location and a second connecting end is welded.

[0065] The other end of the first connector 3 in this embodiment is connected to the positive output terminal of the battery, and the second connector is connected to the negative output terminal of the battery. The positive and negative electrodes of the pole core are connected to the positive and negative output terminals of the battery through the first connector 3 and the second connector.

[0066] Reference Figure 1 and Figure 4 In this embodiment, the first connector 3 and the second connector are both strip-shaped plates when welded, but can be bent after welding. Therefore, the first connector 3 and the second connector in this embodiment have deformation ability, so that they can be bent into a suitable shape and then connected to the positive and negative output terminals of the battery.

[0067] In this embodiment, a plurality of first pole pieces 11 are arranged from the starting end to the ending end along the first direction, and the ending end is the bottom end of the pole core, and the ending end of the pole core is first placed in the battery housing. Figure 2, the starting end is located above the pole core, and the ending end is located below the pole core. Multiple first pole pieces 11 are arranged from top to bottom. The pole pieces extend laterally or horizontally in the figure, and the first pole ear 15 and the second pole ear 16 are arranged.

[0068] Reference Figure 2 The first pole lug 15 includes a first bending section, a first bending section and a first welding section connected in sequence, the first bending section is formed by the first pole lug 15 bending toward the first location until the protruding end of the first pole lug 15 is located on the side of the first connector 3 close to the terminal end, that is, the first bending end, the first bending section is formed by the first pole lug 15 smoothly transitioning toward the surface of the first connector 3 close to the terminal end, and the first welding section is attached to the surface of the first connector 3;

[0069] The second pole ear 16 includes a second first bending section, a second rear bending section and a second welding section which are connected in sequence. The second first bending section is formed by the first pole ear 15 being bent toward the first position until the protruding end of the second pole ear 16 is located on the side close to the terminal end of the first connector 3. The second rear bending section is formed by the second pole ear 16 smoothly transitioning toward the surface close to the terminal end of the first connector 3, and the second welding section fits the surface of the first connector 3.

[0070] Before the first connector 3 is bent, the first rear bending section is in a smooth transition, but after the first connector 3 is bent, the shape of the first rear bending section is irregular, so in this embodiment, the length of the first pole lug 15 is calculated based on the arc of the first connector 3 before bending, which is convenient for calculation. Similarly, the second rear bending section is also the same.

[0071] The sizes of the first pole tab 15 and the second pole tab 16 are calculated in advance and cut before winding, that is, the first pole tab 15 and the second pole tab 16 are die-cut to the required fixed size at one time in the die-cutting process, which can alleviate the cutting pressure of the pole tabs before welding.

[0072] In this embodiment, the distance between the surface of the first connector 3 near the terminal end and the surface of the pole core near the terminal end is a, the length of the pole core in the first direction is b, and a / b is less than or equal to 10%. The distance between the surface of the first connector near the terminal end and the surface of the core body near the terminal end is a, the length of the core body in the first direction is b, and a / b is less than or equal to 10%. The relationship between the thickness of the first connector 3 and the pole core is determined, so that the distance between the first connector and the terminal end of the pole core is equal to 10% of the thickness of the pole core. By setting it in this way, the position of the first connector 3 that is convenient for winding the core into the shell can be calculated for pole cores of different thicknesses, that is, referring to Figure 2 and Figure 7Through the above relationship, the optimal position of the first connecting member 300 close to the second groove can be calculated, so that the bending of the first connecting member 300 will not interfere with the normal folding of the first shell 300, so that the first connecting member 300 will not be squeezed and deformed by the first shell 300.

[0073] Reference Figure 2 and Figure 3 , the first connecting member 3 has a welding area 500, the first connecting end is welded on the welding area 500, and the length of the welding area 500 of the first connecting member 3 is h;

[0074] Reference Figure 3 , Figure 3 The dotted box in the figure represents the outer edge of the diaphragm, the gray filled area represents the third pole piece, the black filled area represents the first pole piece, and the up and down directions in the figure are the width directions of the pole pieces. It can be seen that the design width of the diaphragm 2 is greater than the design width of the first pole piece 11, and the difference between the design width of the diaphragm 2 and the first pole piece 11 is c;

[0075] The arc length of the first rear bending section is d;

[0076] Correction coefficient y, y= (5%-10%)a;

[0077] The length of the second electrode tab 16 at the starting end of the first direction is X, where X=c+b+h+d+y.

[0078] In this embodiment, the two fourth pole pieces 11 are divided into a starting pole piece and a terminating pole piece, the starting pole piece is close to the starting end, and the terminating pole piece is close to the terminating end. The multiple first pole pieces 11 between the starting end and the starting pole piece are arranged in sequence from the starting end to the terminating end, and the starting end to the terminating end is the front and back order of the arrangement of the first pole pieces 11. In other words, referring to the accompanying drawings, the vertically upward direction in the figure is the front, and the vertically downward direction is the rear. Of the two adjacent first pole pieces 11, the first pole piece 11 located above is the previous first pole piece 11 located below.

[0079] Reference Figure 2 and Figure 5 In this embodiment, for the convenience of description, the first tabs 15 are numbered 1, 2, 3, and n from near to far according to the distance from the starting end, and the corresponding lengths are defined as D1, D2, D3, ..., D n The following parameters are also defined: the thickness of the diaphragm 2 is p1, the thickness of the first pole piece 11 is p2, the thickness of the third pole piece 13 is p3, the thickness of the third substrate is p4, and the thickness of the first substrate is p5.

[0080] The length of the first pole tab 15 closest to the starting end = X minus the thickness of the third pole piece 13 minus twice the thickness of the diaphragm 2 minus the thickness of the first pole piece 11. That is, D1 = X-p3-(2×p1)-p2.

[0081] The length of the first pole piece 11 corresponding to the first pole piece 11 arranged between the starting end and the starting pole piece is, in the direction from the starting end to the ending end, the length of the next first pole piece 15 = the length of the previous first pole piece 15 minus the thickness of the third pole piece 13 minus twice the thickness of the diaphragm 2 minus the thickness of the first pole piece 11; D2 = D1-p3-(2×p1)-p2; D3 = D2-p3-(2×p1)-p2; and so on, the length of the first pole piece 15 corresponding to the first pole piece 11 arranged between the starting end and the starting pole piece can be calculated.

[0082] The first pole ear 15 closest to the starting pole ear is defined as t, and its length is defined as D t The first pole ear 15 closest to the termination pole ear is defined as t+1, and its length is defined as D t+1 .

[0083] The length of the first pole ear 15 closest to the terminating pole ear = the length of the first pole ear 15 closest to the starting pole ear minus the thickness of the third pole piece 13 minus the thickness of the third substrate minus 4 times the thickness of the diaphragm 2; that is, D t+1 =D t -p3-p4-(4×p1).

[0084] The length of the first pole piece 11 corresponding to the first pole piece 11 arranged at the terminating pole piece and the terminating end is, in the direction from the starting end to the terminating end, the length of the next first pole piece 15 = the length of the previous first pole piece 15 minus the thickness of the third pole piece 13 minus twice the thickness of the diaphragm 2 minus the thickness of the first pole piece 11. Artificially set D n-2 , D n-1 , D n Arranged in sequence between the terminal lug and the terminal end, and D n-2 The corresponding first pole piece is not the first pole piece closest to the terminal pole ear, that is, D n-2 Not equal to D t+1 , D n-1 = D n-2 - p3-(2×p1)-p2; D n = D n-1 -p3-(2×p1)-p2.

[0085] The length of the second pole tab 16 at the termination end in the first direction = the length of the first pole tab 15 closest to the termination end minus the thickness of the third pole piece 13 minus twice the thickness of the diaphragm 2 minus the thickness of the first pole piece 11. That is, the length of the second pole tab 16 at the termination end is Y, Y = D n -p3-(2×p1)-p2.

[0086] In this embodiment, the number of first pole pieces 11 arranged between the starting end and the starting pole lug is an even number, and the number of first pole pieces 11 arranged between the terminating pole lug and the terminating end is an even number.

[0087] In this embodiment, the number of pole pieces is greater than 30, and the thickness of each pole core is greater than 5.0 mm.

[0088] Second embodiment

[0089] Reference Figure 6 The pole core of the second embodiment of the utility model is different from that of the first embodiment in that, in this embodiment, the number of first pole pieces 11 arranged between the starting end and the ending end is an odd number, the number of first pole pieces 11 from the starting end to the starting pole ear in the figure is an even number, and the number of pole ears from the ending pole ear to the ending end is an odd number.

[0090] In other embodiments, the number of first pole pieces 11 from the starting end to the starting pole lug is an odd number, and the number of pole lugs from the terminating pole lug to the terminating end is an even number, so that the total number of first pole pieces 11 is an odd number.

[0091] Third embodiment

[0092] The battery of the third embodiment of the utility model comprises the pole core described in any one of the above embodiments.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pole core, characterized in that: It comprises a first connecting member and a core body, wherein the core body comprises a plurality of pole pieces and a plurality of diaphragms; The plurality of pole pieces are sequentially arranged from a starting end to a terminating end along a first direction, the diaphragm is arranged between two adjacent pole pieces, and each pole piece has a pole ear extending outward; The plurality of electrode sheets are divided into positive electrode sheets and negative electrode sheets, and the extended ends of the electrode ears corresponding to the positive electrode sheets are bent and gathered at a first position to form a first connection end; The first connecting member is arranged at the first position and is welded to the first connecting end; The distance between the surface of the first connecting member close to the termination end and the surface of the core close to the termination end is a, the length of the core in the first direction is b, and a / b is less than or equal to 10%.

2. The pole core according to claim 1, characterized in that: The plurality of pole pieces are parallel, the plurality of positive pole pieces are divided into a plurality of first pole pieces and two second pole pieces, and the plurality of negative pole pieces are divided into a third pole piece and two fourth pole pieces; The first pole piece includes a first substrate and two first active layers, and the two first active layers are arranged on two opposite sides of the first substrate; The second pole piece includes a second substrate and a second active layer, and the second active layer is arranged on a first side surface of the second substrate; The third pole piece includes a third substrate and two third active layers, and the two third active layers are arranged on two opposite side surfaces of the third substrate; The fourth pole piece includes a fourth substrate and a fourth active layer, and the fourth active layer is arranged on a first side surface of the fourth substrate; The third substrate and the fourth substrate have the same thickness, and the third active layer and the fourth active layer have the same thickness; The plurality of first pole pieces are sequentially arranged from a starting end to a terminating end along a first direction, and two second pole pieces are arranged at two ends of the arrangement direction of the plurality of first pole pieces, and a first side surface of the second pole piece is close to the first pole piece; The two fourth pole pieces are arranged in the middle of the arrangement direction of the first pole pieces, the surfaces of the fourth active layers on the two fourth pole pieces are far away from each other, and two layers of diaphragms are arranged between the two fourth pole pieces; a part of the third pole piece is arranged between two adjacent first pole pieces, and another part of the third pole piece is arranged between the first pole piece and the second pole piece; Each of the first pole pieces has a first pole lug extending outward, and each of the second pole pieces has a second pole lug extending outward. The extending ends of the first pole lugs and the extending ends of the two second pole lugs are bent and gathered at a first location to form the first connecting end.

3. The pole core according to claim 2, characterized in that: Each of the third pole pieces has a third pole lug extending outward, and each of the fourth pole pieces has a fourth pole lug extending outward, and the extending ends of the plurality of third pole lugs and the extending ends of the two fourth pole lugs are bent and gathered at a second location to form a second connecting end; the first location and the second location are arranged at two ends of the second direction of the pole core, and the second direction is perpendicular to the first direction; It also includes a second connecting member, which is arranged at a second location and has a second connecting end welded thereto.

4. The pole core according to claim 3, characterized in that: The first pole tab comprises a first first bending section, a first rear bending section and a first welding section connected in sequence, the first first bending section is formed by first bending the first pole tab toward the first location until the protruding end of the first pole tab is located on the side of the first connector close to the terminal end, the first rear bending section is formed by the first pole tab smoothly transitioning toward the surface of the first connector close to the terminal end, and the first welding section is attached to the surface of the first connector; The second pole ear includes a second first bending section, a second rear bending section and a second welding section connected in sequence, the second first bending section is formed by first bending the first pole ear toward the first position until the protruding end of the second pole ear is located on the side of the first connector close to the terminal end, the second rear bending section is formed by the second pole ear smoothly transitioning toward the surface of the first connector close to the terminal end, and the second welding section fits the surface of the first connector.

5. The pole core according to claim 4, characterized in that: The first connecting member has a welding area, the first connecting end is welded at the welding area, and the length of the welding area of ​​the first connecting member is h; The design width of the diaphragm is greater than the design width of the first pole piece, and the difference between the design width of the diaphragm and the design width of the first pole piece is c; The arc length of the first rear bending section is d; Correction coefficient y, y= (5%-10%)a; The length of the second electrode tab at the starting end of the first direction is X, where X=c+b+h+d+y.

6. The pole core according to claim 5, characterized in that: The two fourth pole tabs are divided into a starting pole tab and a terminating pole tab, wherein the starting pole tab is close to the starting end, and the terminating pole tab is close to the terminating end; The length of the first pole ear closest to the starting end=X minus the thickness of the third pole piece minus twice the thickness of the diaphragm minus the thickness of the first pole piece; The length of the first pole piece corresponding to the first pole piece arranged between the starting end and the starting pole piece, in the direction from the starting end to the ending end, the length of the next first pole piece = the length of the previous first pole piece minus the thickness of the third pole piece minus twice the thickness of the diaphragm minus the thickness of the first pole piece; The length of the first pole ear closest to the terminating pole ear=the length of the first pole ear closest to the starting pole ear minus the thickness of the third pole piece minus the thickness of the third substrate minus 4 times the thickness of the diaphragm; The length of the first pole lug corresponding to the first pole piece arranged at the terminating pole lug and the terminating end, in the direction from the starting end to the terminating end, the length of the latter first pole lug = the length of the former first pole lug minus the thickness of the third pole piece minus twice the thickness of the diaphragm minus the thickness of the first pole piece; The length of the second pole tab at the termination end in the first direction=the length of the first pole tab closest to the termination end minus the thickness of the third pole piece minus twice the thickness of the diaphragm minus the thickness of the first pole piece.

7. The pole core according to claim 6, characterized in that: The number of first pole pieces arranged between the starting end and the starting pole lug is an even number, and the number of first pole pieces arranged between the terminating pole lug and the terminating end is an even number.

8. The pole core according to claim 4, characterized in that: The number of first pole pieces arranged between the starting end and the terminating end is an odd number.

9. The pole core according to claim 1, characterized in that: The number of the pole pieces is greater than 30.

10. A battery, characterized in that: Comprising the pole core described in any one of claims 1-9.

Images