Pole core and battery
By designing a layered electrode structure in the electrode core and using conventional welding equipment to achieve effective welding of the multi-layered electrodes, the problem of poor electrode tab welding was solved, thus improving the energy and power performance of lithium-ion batteries.
Patent Information
- Application Number
- CN202520216437.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-11
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2035-02-11
AI Technical Summary
In the current electrode tab welding process, conventional ultrasonic tooth welding and laser welding cannot effectively bond multiple layers of electrode sheets, resulting in insufficient effective residual welding area or insufficient penetration depth. This leads to overcurrent temperature rise at the electrode tab position and high internal resistance of the battery, affecting the battery's cycle life and power performance.
The electrode core structure is designed so that the electrode sheets are divided into at least two types, each type of electrode sheet is provided with an electrode tab, and multiple electrode sheets are stacked to form at least two terminals. Effective bonding is achieved through conventional ultrasonic tooth welding and laser welding. The electrode core structure is optimized to increase the number of electrode sheet layers and the number of terminals.
Effective welding of multi-layer electrodes can be achieved on conventional welding equipment to avoid excessive welding residue area or insufficient penetration, thereby improving the energy density and power density of lithium-ion batteries.
Smart Images
Figure CN223612617U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field, specifically, relate to a kind of pole core and battery. BACKGROUND
[0002] Lithium ion secondary battery is widely used in electric passenger car, commercial energy storage, communication energy storage and other fields in recent years, and the energy density and power performance requirements of lithium secondary battery in these market fields are also higher and higher. In order to improve the energy density and power, the thickness of lithium battery increases obviously, the number of pole core that constitutes battery increases, and the number of pole piece included by single pole core increases, which all pose great challenge to tab welding.
[0003] The inventor found that when the total number of tabs increases to more than 90 layers, conventional ultrasonic tooth welding and laser welding cannot achieve effective bonding, and the welding effective residual area or insufficient penetration may occur, thereby causing the temperature rise of the tab position and the phenomenon of large battery internal resistance, affecting the cycle life and power performance of the battery. The existing method is to increase the power of welding equipment or introduce a new laser for effective welding, but this method is high in cost. UTILITY MODEL CONTENT
[0004] The utility model aims to provide a kind of pole core and battery, optimize the overall structure of pole core, can realize the total number of pole piece increases on conventional welding equipment, the total number of terminal increases, and then improve the energy density and power density of lithium ion battery.
[0005] The embodiment of the utility model can be realized as follows:
[0006] In the first aspect, the utility model provides a kind of pole core, and the positive terminal of the pole core or the negative terminal of the pole core forms at least two interval arranged terminals;
[0007] A plurality of pole pieces and diaphragms are stacked in sequence to form the pole core, the pole piece includes at least two kinds and is respectively a first pole piece and a second pole piece, the first pole piece is provided with a first tab, and the second pole piece is provided with a second tab, the first tab and the second tab are located on the same side of the pole piece, and the plurality of pole pieces are stacked to make the first tab and the second tab respectively stacked to form two terminals.
[0008] In the optional embodiment, the pole piece includes a positive pole piece, the positive pole piece includes at least two kinds and is respectively a first positive pole piece and a second positive pole piece, the first tab is a first positive tab, and the second tab is a second positive tab;
[0009] The first positive tab is provided on the first positive electrode tab, the second positive tab is provided on the second positive electrode tab, the first positive tab and the second positive tab are located on the same side of the positive electrode tab, a plurality of the first positive tabs are stacked to form one positive terminal, a plurality of the second positive tabs are stacked to form another positive terminal, and the two positive terminals are spaced apart and located at the positive end of the pole core.
[0010] In an optional embodiment, the thickness of the first positive tab is 8-20 μm, and the thickness of the second positive tab is 8-20 μm.
[0011] In an optional embodiment, the pole core is stacked in the order of the first positive electrode tab, the separator, the negative electrode tab, the separator, the second positive electrode tab, the separator, the negative electrode tab, and the separator.
[0012] The positive end of the pole core forms two spaced-apart positive terminals, and the negative end of the pole core forms one negative terminal.
[0013] In an optional embodiment, the pole tab includes a negative pole tab, the negative pole tab is at least two and is respectively a first negative pole tab and a second negative pole tab, the first pole tab is a first negative pole tab, and the second pole tab is a second negative pole tab.
[0014] The first negative tab is provided on the first negative electrode tab, the second negative tab is provided on the second negative electrode tab, the first negative tab and the second negative tab are located on the same side of the negative electrode tab, a plurality of the first negative tabs are stacked to form one negative terminal, and the second negative tab is stacked to form another negative terminal, and the two negative terminals are spaced apart and located at the negative end of the pole core.
[0015] In an optional embodiment, the thickness of the first negative tab is 4-16 μm, and the thickness of the second negative tab is 4-16 μm.
[0016] In an optional embodiment, the pole core is stacked in the order of a positive pole tab, the separator, the first negative pole tab, the separator, the positive pole tab, the separator, the second negative pole tab, and the separator.
[0017] The positive end of the pole core forms one positive terminal, and the negative end of the pole core forms two spaced-apart negative terminals.
[0018] In an optional embodiment, the first pole tab and the second pole tab are stacked in the same number of layers or in different numbers of layers, so that the height of at least two of the terminals is equal or not equal.
[0019] In an optional embodiment, the number of stacked layers of the first pole tab is 2-90 layers, and the number of stacked layers of the second pole tab is 2-90 layers.
[0020] In a second aspect, the utility model provides a kind of battery, including the pole core of any one of preceding embodiment.
[0021] The pole core and the battery provided in the utility model embodiment have the following beneficial effects:
[0022] By setting the pole piece at least including first pole piece and second pole piece, the plurality of pole pieces stacking can make the first lug and the second lug respectively stacked to form two terminals. Therefore, in the case that the total number of pole pieces increases, the thickness of the terminal stacked by the plurality of first lugs and the thickness of the terminal stacked by the plurality of second lugs are both reduced relative to the thickness of the conventional single terminal, and then at least two terminals can be effectively bonded by conventional ultrasonic tooth welding and laser welding, avoiding the situation that the effective residual area of welding or the penetration depth is not enough due to the excessive thickness of the terminal, and then avoiding the phenomenon of excessive temperature rise of lug position and large battery resistance. At the same time, the overall structure of the pole core is optimized, and the total number of pole pieces and the total number of terminals can be increased on the conventional welding equipment, and then the energy density and power density of the lithium ion battery are improved. BRIEF DESCRIPTION OF DRAWINGS
[0023] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will briefly introduce the drawings needed to be used in the embodiment, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.
[0024] Figure 1 The structure diagram of the pole core provided for this embodiment is a positive pole piece;
[0025] Figure 2 The structure diagram of the first positive pole piece and the second positive pole piece provided for this embodiment is shown in the figure;
[0026] Figure 3 The structure diagram of the negative pole piece provided for this embodiment is shown in the figure;
[0027] Figure 4 The cross-sectional view of the pole core provided for this embodiment is a positive pole piece;
[0028] Figure 5 The structure diagram of the pole core provided for this embodiment is a negative pole piece;
[0029] Figure 6 The structure diagram of the first negative pole piece and the second negative pole piece provided for this embodiment is shown in the figure;
[0030] Figure 7A structure schematic diagram of the positive electrode sheet provided for the embodiment is shown in the figure.
[0031] Figure 8 A cross-sectional view of the pole core of the negative electrode sheet provided for the embodiment is shown in the figure.
[0032] Icon: 010-pole core; 012-separator; 013-positive electrode terminal; 014-negative electrode terminal; 100-positive electrode sheet; 101-positive electrode tab; 110-first positive electrode sheet; 111-first positive electrode tab; 120-second positive electrode sheet; 121-second positive electrode tab; 200-negative electrode sheet; 201-negative electrode tab; 210-first negative electrode sheet; 211-first negative electrode tab; 220-second negative electrode sheet; 221-second negative electrode tab. DETAILED DESCRIPTION
[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.
[0034] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the utility model.
[0035] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0036] In the description of the utility model, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the utility model product in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.
[0037] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0038] It should be noted that the features in the embodiments of the utility model can be combined with each other without conflict.
[0039] The overall structure, working principle and technical effects of the pole core 010 and the battery are described in detail below by means of embodiments and in combination with the drawings.
[0040] Please refer to Figure 1 and Figure 5 The pole core 010 provided by the utility model is applied to a battery, especially a laminated battery core.
[0041] The battery can be all types of lithium ion batteries, including but not limited to ternary lithium ion batteries, lithium cobalt oxide lithium ion batteries, lithium iron phosphate lithium ion batteries, lithium manganate lithium ion batteries and lithium iron phosphate manganese lithium ion batteries, etc.
[0042] Please refer to Figure 1 and Figure 5 The pole core 010 provided by the utility model is applied to a battery, especially a laminated battery core.
[0043] It can be understood that by setting the pole piece including at least the first pole piece and the second pole piece, the plurality of pole pieces can be stacked to form two terminals by stacking the first pole lug and the second pole lug respectively. In the case of increasing the total number of pole pieces, the thickness of the terminal formed by stacking the first pole lug and the thickness of the terminal formed by stacking the second pole lug are both reduced relative to the thickness of the conventional single terminal, so that the at least two terminals can be effectively bonded by conventional ultrasonic tooth welding and laser welding, avoiding the situation that the terminal is too thick to have a welding effective residual area or insufficient penetration, thereby avoiding the phenomenon of excessive temperature rise of the pole lug position and large battery internal resistance; at the same time, the overall structure of the pole core 010 is optimized, the total number of pole pieces can be increased on the conventional welding equipment, the total number of terminals is increased, and the energy density and power density of the lithium ion battery are improved.
[0044] In the embodiment, the pole piece includes at least two first pole pieces and second pole pieces, the first pole piece is provided with a first pole lug, and the second pole piece is provided with a second pole lug. The first pole piece and the second pole piece are two identical sheet structures, the first pole lug is located above one side of the first pole piece, the second pole lug is located below one side of the second pole piece, and the first pole lug and the second pole lug are arranged in a staggered manner to enable the two terminals formed by stacking to be spaced apart.
[0045] Optionally, the first and second tabs are stacked in equal or unequal number of layers, so that the heights of the at least two terminals are equal or unequal.
[0046] It can be understood that when the first and second tabs are stacked in equal number of layers, the number of layers of the first and second tabs is equal, and the heights of the two terminals stacked are equal. When the first and second tabs are stacked in unequal number of layers, the number of layers of the first and second tabs is unequal, and the heights of the two terminals stacked are unequal.
[0047] Optionally, the first tab is stacked in 2-90 layers, and the second tab is stacked in 2-90 layers.
[0048] In this embodiment, the pole core 010 is formed by stacking the positive tab 100, the separator 012, and the negative tab 200 in sequence; one side of the positive tab 100 is provided with a positive tab 101, and one side of the negative tab 200 is provided with a negative tab 201. The positive tab 100, the separator 012, and the negative tab 200 are stacked in sequence to stack a plurality of positive tabs 101 at the positive end of the pole core 010 to form a positive terminal 013, and to stack a plurality of negative tabs 201 at the negative end of the pole core 010 to form a negative terminal 014.
[0049] The positive end of the pole core 010 and the negative end of the pole core 010 are located at opposite ends of the pole core 010, respectively.
[0050] Therefore, the tab in the present application includes the positive tab 100 and the negative tab 200.
[0051] In one embodiment, the tab can be the positive tab 100. The positive tab 100, the separator 012, the negative tab 200, and the separator 012 are stacked in sequence to form at least two spaced apart terminals at the positive end of the pole core 010.
[0052] In an optional embodiment, please refer to Figures 1-4 The tab is the positive tab 100. Please refer to Figure 2 The positive tab 100 is at least two and is respectively the first positive tab 110 and the second positive tab 120, the first tab is the first positive tab 111, and the second tab is the second positive tab 121; the first positive tab 110 is provided with the first positive tab 111, and the second positive tab 120 is provided with the second positive tab 121. The first positive tab 111 and the second positive tab 121 are located on the same side of the positive tab 100, a plurality of first positive tabs 111 are stacked to form one positive terminal 013, a plurality of second positive tabs 121 are stacked to form another positive terminal 013, and the two positive terminals 013 are spaced apart and located at the positive end of the pole core 010.
[0053] In this embodiment, please refer to Figure 4The positive core 010 is formed by stacking the first positive sheet 110, the separator 012, the negative sheet 200, the separator 012, the second positive sheet 120, the separator 012, the negative sheet 200, and the separator 012 in sequence. Figure 2 The plurality of first positive tabs 111 are stacked to form one positive terminal 013, and the plurality of second positive tabs 121 are stacked to form another positive terminal 013, so that the positive end of the positive core 010 forms two spaced apart positive terminals 013. Figure 3 The negative sheet 200 is provided with a negative tab 201 on one side, so that the negative end of the positive core 010 forms one negative terminal 014.
[0054] It can be understood that the positive sheet 100 is optimized, and the positive sheet 100 is divided into the first positive sheet 110 and the second positive sheet 120, so that when the total number of layers of the overall positive sheet increases, the thickness of the plurality of stacked first positive tabs 111 and the thickness of the plurality of stacked second positive tabs 121 are both much smaller than the thickness of a conventional single terminal; and then the plurality of stacked first positive tabs 111 and the plurality of stacked second positive tabs 121 are respectively subjected to conventional ultrasonic tooth welding and laser welding to achieve effective bonding, and the plurality of stacked first positive tabs 111 and the plurality of stacked second positive tabs 121 are welded to form two spaced apart positive terminals 013.
[0055] The material of the first positive tab 111 and the second positive tab 121 is aluminum.
[0056] Optionally, the thickness of the first positive tab 111 is 8-20 μm, and the thickness of the second positive tab 121 is 8-20 μm.
[0057] Optionally, the first positive tab 111 and the second positive tab 121 are stacked in equal layers or unequal layers, so that the heights of the at least two positive terminals 013 are equal or unequal.
[0058] Optionally, the number of stacked layers of the first positive tab 111 is 2-90 layers, and the number of stacked layers of the second positive tab 121 is 2-90 layers.
[0059] In an embodiment, the positive sheet can also be the negative sheet 200, and the positive sheet 100, the separator 012, the negative sheet 200, and the separator 012 are stacked in sequence to form at least two spaced apart terminals at the negative end of the positive core 010.
[0060] In an optional embodiment, please refer to Figures 5-8, the pole piece is a negative pole piece 200, the negative pole piece 200 is at least two and is respectively a first negative pole piece 210 and a second negative pole piece 220, the first tab is a first negative tab 211, and the second tab is a second negative tab 221; the second negative pole piece 220 is provided with the first negative tab 211, the first negative pole piece 210 is provided with the second negative tab 221, the first negative tab 211 and the second negative tab 221 are located on the same side of the negative pole piece 200, a plurality of first negative tabs 211 are stacked to form a negative terminal 014, a plurality of second negative tabs 221 are stacked to form another negative terminal 014, and the two negative terminals 014 are arranged at intervals and located at the negative end of the pole core 010.
[0061] In this embodiment, please refer to Figure 8 , the pole core 010 is stacked by the positive pole piece 100, the separator 012, the first negative pole piece 210, the separator 012, the positive pole piece 100, the separator 012, the second negative pole piece 220 and the separator 012 in sequence; wherein, please refer to Figure 7 , the positive pole piece 100 is provided with a positive tab 101 on one side, so that the positive end of the pole core 010 forms a positive terminal 013; wherein, please refer to Figure 6 , a plurality of first negative tabs 211 are stacked to form a negative terminal 014, and a plurality of second negative tabs 221 are stacked to form another negative terminal 014, so that the negative end of the pole core 010 forms two negative terminals 014 arranged at intervals.
[0062] It can be understood that the negative pole piece 200 is optimized, the negative pole piece 200 is divided into the first negative pole piece 210 and the second negative pole piece 220, so that when the number of layers of the whole pole piece increases, the thickness of the plurality of stacked first negative tabs 211 and the thickness of the plurality of stacked second negative tabs 221 are both much smaller than the thickness of the conventional single negative terminal 014; and then the plurality of stacked first negative tabs 211 and the plurality of stacked second negative tabs 221 are respectively subjected to conventional ultrasonic tooth welding and laser welding, which can realize effective bonding, so that the plurality of stacked first negative tabs 211 and the plurality of stacked second negative tabs 221 form two negative terminals 014 arranged at intervals through welding.
[0063] The material of the first negative tab 211 and the second negative tab 221 is copper material.
[0064] Optionally, the thickness of the first negative tab 211 is 4-16 μm, and the thickness of the second negative tab 221 is 4-16 μm.
[0065] Optionally, the first negative tab 211 and the second negative tab 221 are stacked in equal layers or unequal layers, so that the heights of the at least two negative terminals 014 are equal or unequal.
[0066] Optionally, the first negative tab 211 has a stack number of 2-90 layers, and the second negative tab 221 has a stack number of 2-90 layers.
[0067] In an embodiment, the pole piece can also be the positive pole piece 100 and the negative pole piece 200, and the positive pole piece 100, the separator 012, the negative pole piece 200, and the separator 012 are sequentially stacked to form at least two spaced apart terminals at the positive end of the pole piece 010 and the negative end of the pole piece 010, respectively.
[0068] In an optional embodiment, the pole piece is the positive pole piece 100 and the negative pole piece 200, and the positive pole piece 100 is at least two and is respectively the first positive pole piece 110 and the second positive pole piece 120, the first positive pole piece 110 is provided with the first positive tab 111, the first positive pole piece 110 is provided with the second positive tab 121, the first positive tab 111 and the second positive tab 121 are located on the same side of the positive pole piece 100, a plurality of first positive tabs 111 are stacked to form one positive terminal 013, a plurality of second positive tabs 121 are stacked to form another positive terminal 013, and the two positive terminals 013 are spaced apart and located at the positive end of the pole piece 010; the negative pole piece 200 is at least two and is respectively the first negative pole piece 210 and the second negative pole piece 220, the first negative pole piece 210 is provided with the first negative tab 211, the first negative pole piece 210 is provided with the second negative tab 221, the first negative tab 211 and the second negative tab 221 are located on the same side of the negative pole piece 200, a plurality of first negative tabs 211 are stacked to form one negative terminal 014, and a plurality of second negative tabs 221 are stacked to form another negative terminal 014, and the two negative terminals 014 are spaced apart and located at the negative end of the pole piece 010.
[0069] In this embodiment, the pole piece 010 is sequentially stacked by the first positive pole piece 110, the separator 012, the first negative pole piece 210, the separator 012, the second positive pole piece 120, the separator 012, the second negative pole piece 220, and the separator 012; wherein a plurality of first positive tabs 111 are stacked to form one positive terminal 013, a plurality of second positive tabs 121 are stacked to form another positive terminal 013, so that the positive end of the pole piece 010 forms two spaced apart positive terminals 013; wherein a plurality of first negative tabs 211 are stacked to form one negative terminal 014, and a plurality of second negative tabs 221 are stacked to form another negative terminal 014, so that the negative end of the pole piece 010 forms two spaced apart negative terminals 014.
[0070] In the embodiment, the pole piece includes at least two pole pieces, and the two pole pieces are respectively a first pole piece and a second pole piece. Of course, in other embodiments, the pole piece can also include three pole pieces, and the three pole pieces are respectively a first pole piece, a second pole piece and a third pole piece. The first pole piece is provided with a first tab, the second pole piece is provided with a second tab, and the third pole piece is provided with a third tab. The first tab, the second tab and the third tab are located on the same side of the pole piece. The plurality of pole pieces are stacked to stack the plurality of first tabs, the plurality of second tabs and the plurality of third tabs to form three terminals respectively. The pole piece can also include four pole pieces, five pole pieces, and so on. In this way, the plurality of pole pieces are stacked to form four terminals, five terminals, and so on. The number of the pole pieces is not limited in the application.
[0071] In summary, the pole core 010 and the battery provided by the embodiment of the utility model have the following advantages. The pole piece includes at least a first pole piece and a second pole piece. The plurality of pole pieces are stacked to stack the plurality of first tabs and the plurality of second tabs to form two terminals respectively. Therefore, in the case that the total number of layers of the pole piece is increased, the thickness of the terminal formed by stacking the plurality of first tabs and the thickness of the terminal formed by stacking the plurality of second tabs are both reduced relative to the thickness of the conventional single terminal. In this way, the at least two terminals can be effectively bonded by the conventional ultrasonic tooth welding and laser welding. The phenomenon that the position of the tab is excessively high in temperature rise and the battery is large in internal resistance can be avoided. Meanwhile, the overall structure of the pole core 010 is optimized. The total number of layers of the pole piece and the total number of terminals can be increased on the conventional welding equipment. In this way, the energy density and the power density of the lithium ion battery are improved.
[0072] The above is only a specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, and the changes or replacements should be covered in the protection scope of the utility model.
Claims
1. A pole core, characterized by, The positive electrode end of the pole core or the negative electrode end of the pole core forms at least two spaced apart terminals; A plurality of pole pieces and separators are sequentially stacked to form the pole core, the pole pieces include at least two types and are respectively a first pole piece and a second pole piece, the first pole piece is provided with a first tab, the second pole piece is provided with a second tab, the first tab and the second tab are located on the same side of the pole piece, and the plurality of pole pieces are stacked so that the first tab and the second tab are respectively stacked to form two terminals.
2. The pole core according to claim 1, characterized in that The pole piece includes a positive pole piece, the positive pole piece includes at least two types and is respectively a first positive pole piece and a second positive pole piece, the first tab is a first positive tab, and the second tab is a second positive tab; The first positive pole piece is provided with the first positive tab, the second positive pole piece is provided with the second positive tab, the first positive tab and the second positive tab are located on the same side of the positive pole piece, a plurality of the first positive tabs are stacked to form a positive electrode terminal, a plurality of the second positive tabs are stacked to form another positive electrode terminal, and the two positive electrode terminals are spaced apart and located at the positive electrode end of the pole core.
3. The pole core of claim 2, wherein The thickness of the first positive tab is 8-20 μm, and the thickness of the second positive tab is 8-20 μm.
4. The pole core of claim 2, wherein The pole core is sequentially stacked by the first positive pole piece, the separator, a negative pole piece, the separator, the second positive pole piece, the separator, the negative pole piece, and the separator; So that the positive electrode end of the pole core forms two spaced apart positive electrode terminals, and the negative electrode end of the pole core forms one negative electrode terminal.
5. The pole core of claim 1, wherein The pole piece includes a negative pole piece, the negative pole piece includes at least two types and is respectively a first negative pole piece and a second negative pole piece, the first tab is a first negative tab, and the second tab is a second negative tab; The first negative pole piece is provided with the first negative tab, the second negative pole piece is provided with the second negative tab, the first negative tab and the second negative tab are located on the same side of the negative pole piece, a plurality of the first negative tabs are stacked to form a negative electrode terminal, and the second negative tab is stacked to form another negative electrode terminal, and the two negative electrode terminals are spaced apart and located at the negative electrode end of the pole core.
6. The pole core of claim 5, wherein The thickness of the first negative tab is 4-16 μm, and the thickness of the second negative tab is 4-16 μm.
7. The pole core of claim 5, wherein The pole core is sequentially stacked by a positive pole piece, the separator, the first negative pole piece, the separator, the positive pole piece, the separator, the second negative pole piece, and the separator; So that the positive electrode end of the pole core forms one positive electrode terminal, and the negative electrode end of the pole core forms two spaced apart negative electrode terminals.
8. The pole core of claim 1, wherein The first tab and the second tab are stacked in equal or unequal layers, so that the height of at least two terminals is equal or unequal.
9. The pole core of claim 1, wherein The number of stacked layers of the first tab is 2-90 layers, and the number of stacked layers of the second tab is 2-90 layers.
10. A battery, characterized by The pole core includes any one of claims 1-9.