High-capacity vertical bipolar battery
By setting an uncoated area in a vertical bipolar cell and folding it in a "Z" shape along the uncoated area, combined with a sealing insulating layer and liquid electrolyte, the problems of increasing battery capacity and wetting difficulty were solved, and a high-capacity and high-energy-density battery design was achieved.
Patent Information
- Application Number
- CN202520177057.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-02
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-02-02
AI Technical Summary
Existing vertical bipolar batteries increase capacity by increasing the electrode coating area, but this leads to larger cells, which limits practical applications. Furthermore, the larger electrode area makes it more difficult for the electrolyte to wet the cells during charging and discharging.
The battery adopts a vertical bipolar structure, including bipolar electrodes, unipolar positive electrodes, and unipolar negative electrodes. By setting uncoated areas on the electrodes and folding them in a "Z" shape along the uncoated areas, combined with a sealing insulating layer and liquid electrolyte, the electrolyte is prevented from flowing through, thereby improving capacity and wettability.
It achieves high-capacity and high-energy-density batteries, avoiding the problems of excessively large cells and difficulty in electrolyte wetting, while also facilitating mass production.
Smart Images
Figure CN223956603U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to battery technical field especially relates to a high capacity's vertical bipolarity battery. BACKGROUND
[0002] At present, with the large-scale application of lithium ion batteries, the shortage of lithium resources and the price rise of raw materials have become important factors restricting development and production, and it is urgent to develop low-cost secondary batteries. Sodium ion battery has similar mechanism with lithium ion battery, and sodium resource reserves are abundant, which is a very potential battery system.
[0003] Bipolar battery can realize high voltage and energy density on single battery. Usually, bipolar battery can be divided into vertical and horizontal structures. Among them, the left and right sides of the current collector of the horizontal structure bipolar battery are coated with positive and negative electrodes respectively during coating. By extending in parallel with the pole piece to form series connection to improve the corresponding voltage, and by stacking in the vertical direction of the pole piece to form parallel connection to improve the capacity of the battery cell. The vertical structure stacks bipolar pole pieces in the vertical direction of the pole piece to form series connection to improve voltage.
[0004] The capacity of vertical structure bipolar battery can be improved by parallel connection of internal series connection units, or by increasing the coating area of the pole piece. However, the increase of pole piece area will cause the synchronous increase of battery cell, which eventually leads to the thin and large battery cell, and the actual application is limited. At the same time, the increase of pole piece will also increase the difficulty of electrolyte infiltration in the center part of the pole piece during the charging and discharging cycle of the battery cell. SUMMARY
[0005] The utility model embodiment provides a kind of vertical bipolarity battery of high capacity, to solve the capacity of existing vertical bipolarity battery is improved by increasing the coating area of pole piece to be realized, and the increase of pole piece area will cause the synchronous increase of battery cell, which eventually leads to the thin and large battery cell, and the actual application is limited. The vertical bipolarity battery of high capacity provided by the utility model has high capacity and voltage, and can also maintain high energy density relative to external parallel connection. By setting the structure of pole piece, the problem of battery cell infiltration is improved, and the defect that the increase of pole piece leads to the oversize of battery cell is avoided.
[0006] The utility model embodiment is realized as follows:
[0007] A kind of vertical bipolarity battery of high capacity, including vertical bipolarity battery cell, the vertical bipolarity battery cell includes bipolar pole piece, single polarity positive pole piece and single polarity negative pole piece and separator;
[0008] The bipolar sheet comprises a first current collector, a plurality of first positive electrode coating layers, a plurality of first negative electrode coating layers, and a first sealing insulation layer; the first positive electrode coating layers and the first negative electrode coating layers are respectively arranged on both sides of the first current collector, and the first positive electrode coating layers and the first negative electrode coating layers are alternately arranged with the uncoated areas.
[0009] The monopolar positive sheet and the monopolar negative sheet are respectively arranged on both sides of the unfolded vertical bipolar battery, and the bipolar sheet is arranged between the monopolar positive sheet and the monopolar negative sheet; the separator is arranged between adjacent sheets.
[0010] The vertical bipolar battery is arranged in a back-and-forth Z-shaped folding manner with the uncoated area as the folding part.
[0011] Further, the monopolar positive sheet comprises a second current collector, a plurality of second positive electrode coating layers, and a first tab, the second positive electrode coating layers are arranged on one side of the second current collector, and the second positive electrode coating layers are alternately arranged with the uncoated areas; the first tab is arranged at one end of the second current collector.
[0012] Further, the monopolar negative sheet comprises a third current collector, a plurality of second negative electrode coating layers, and a second tab, the second negative electrode coating layers are arranged on one side of the third current collector, and the second negative electrode coating layers are alternately arranged with the uncoated areas; the second tab is arranged at one end of the third current collector.
[0013] Further, in the vertical bipolar battery, each positive electrode coating layer is smaller than the corresponding negative electrode coating layer, and the center of each positive electrode coating layer is the same as that of the corresponding negative electrode coating layer. The positive electrode coating layers comprise first positive electrode coating layers and second positive electrode coating layers; the negative electrode coating layers comprise first negative electrode coating layers and second negative electrode coating layers.
[0014] Further, the number of the first positive electrode coating layers and the first negative electrode coating layers on the first current collector is consistent; the number of the first positive electrode coating layers is ≥2, and the number of the first negative electrode coating layers is ≥2.
[0015] Further, the outer side of the first positive electrode coating layer is provided with a first sealing insulation layer, and the first sealing insulation layer is fixed on the first current collector, which is convenient for subsequent sheet stacking and sealing; similarly, the outer side of the first negative electrode coating layer is provided with a first sealing insulation layer, and the first sealing insulation layer is fixed on the first current collector.
[0016] Further, the separator is arranged between adjacent sheets, and the sheets comprise bipolar sheets, monopolar positive sheets, and monopolar negative sheets. Further, the separator is a porous thermosetting material separator with good electrolyte resistance.
[0017] Further, the outer side of the pole piece is provided with a sealing insulation layer. Specifically, the bipolar pole piece, the unipolar positive pole piece and the unipolar negative pole piece are provided with a sealing insulation layer at the outer side edge of the side of the coating layer (including the positive pole coating layer and the negative pole coating layer) on the current collector. Further, the sealing insulation layer is a heat-resistant material sealing insulation layer with good electrolyte resistance; and the heat-resistant material sealing insulation layer is preferably a polypropylene or polyethylene heat-resistant material insulation layer with good electrolyte resistance.
[0018] Further, the first tab of the unipolar positive pole piece is arranged reversely to the tab position of the second tab of the unipolar negative pole piece.
[0019] Further, the number of the bipolar pole pieces in the vertical bipolar battery is greater than or equal to 1.
[0020] Further, the electrolyte of the vertical bipolar battery is a liquid electrolyte. The liquid electrolyte guarantees low interface impedance and high ion conductivity, and the sealing insulation layer is added to prevent liquid leakage.
[0021] Further, the battery is one of a potassium ion battery, a lithium ion battery or a calcium ion battery.
[0022] The vertical bipolar battery with high capacity in the utility model, the positive and negative pole materials are coated on the front and back surfaces of the current collector respectively, and are used as vertical bipolar pole pieces; the unipolar positive pole piece, the unipolar negative pole piece and the bipolar pole piece are laminated together to form a vertical bipolar battery, the number of the bipolar pole pieces in the vertical bipolar battery is X (X is at least 1); the sealing insulation layer is added on the light foil area outside the pole coating area, and the electrolyte between the positive pole and the negative pole is blocked in the interior after the sealing insulation layer is hot-pressed, so that liquid leakage and liquid channeling are avoided.
[0023] The utility model uses liquid electrolyte as the electrolyte, guarantees low interface impedance and high ion conductivity, adds the sealing insulation layer to prevent liquid channeling of the liquid electrolyte; the longer pole piece can improve the capacity of the battery, and the several reserved uncoated areas in the middle can guarantee the infiltration of the battery in the circulation process and facilitate folding of the battery to avoid the battery being too long.
[0024] Compared with the prior art, the utility model has the following beneficial effects:
[0025] 1. The vertical bipolar battery in the utility model, the pole piece is elongated in one direction, but the blank current collector area is reserved in the middle, which improves the battery capacity and guarantees the infiltration in the coating area.
[0026] 2. The vertical bipolarity battery cell in the utility model, along the blank current collector area of the non-coated area, back and forth folding in "Z" shape, can reduce the length of the battery cell; the capacity of the battery cell is increased as a whole, and the problem of too long battery cell does not occur.
[0027] 3. The high-capacity vertical bipolarity battery provided by the utility model has high capacity and voltage, can also maintain high energy density relative to external parallel connection, improves the problem of battery cell infiltration through the setting of the pole piece structure, and avoids the defect of too large battery cell caused by the increase of the pole piece. Meanwhile, the utility model also provides the corresponding battery cell lamination and sealing process, so as to realize mass production. BRIEF DESCRIPTION OF DRAWINGS
[0028] Figure 1 is the structure schematic view of the vertical bipolarity battery cell before folding provided by the utility model embodiment;
[0029] Figure 2 is the structure schematic view of the vertical bipolarity battery cell (after folding) provided by the utility model embodiment;
[0030] Figure 3 is the structure schematic view of the bipolarity pole piece provided by the utility model embodiment; wherein, A is the front structure schematic view of the bipolarity pole piece; B is the back structure schematic view of the bipolarity pole piece;
[0031] Figure 4 is the structure schematic view of the monopolarity positive pole piece provided by the utility model embodiment;
[0032] Figure 5 is the structure schematic view of the monopolarity negative pole piece provided by the utility model embodiment. DETAILED DESCRIPTION
[0033] The technical solutions in the utility model embodiments will be clearly and completely described below with reference to the drawings in the utility model embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.
[0034] It should be noted that if the utility model embodiments involve directional indications (such as up, down, left, right, front, back, top, bottom, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), if the certain posture changes, the directional indications also change accordingly.
[0035] In this application, unless otherwise clearly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.
[0036] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a mediating element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a mediating element.
[0037] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.
[0038] At present, the capacity of the existing vertical bipolar battery is improved by increasing the coating area of the pole piece, and the increase of the pole piece area will increase the battery core, which ultimately leads to the problem of thin and large battery core, which is limited in practical application. And the increase of the pole piece will also increase the difficulty of electrolyte infiltration in the center part of the pole piece during the charging and discharging cycle of the battery core. In order to solve the above technical problems, the present application provides a high-capacity vertical bipolar battery.
[0039] Embodiments
[0040] As shown in Figure 1 and Figure 2 A high-capacity vertical bipolar battery, comprising a vertical bipolar battery core, the vertical bipolar battery core comprising a bipolar pole piece 100, a single-polarity positive pole piece 200 and a single-polarity negative pole piece 300, and a separator 400.
[0041] As shown in Figure 3As shown, the bipolar electrode 100 includes a first current collector 101, a plurality of first positive electrode coating layers 102, a plurality of first negative electrode coating layers 103, and a first sealing and insulating layer 104; the first positive electrode coating layers 102 and the first negative electrode coating layers 103 are respectively disposed on both sides of the first current collector 101, the plurality of first positive electrode coating layers 102 are alternately disposed with uncoated areas 105, and the plurality of first negative electrode coating layers 103 are alternately disposed with uncoated areas 105;
[0042] The unipolar positive electrode 200 and the unipolar negative electrode 300 are respectively disposed on both sides of the folded vertical bipolar cell, and the bipolar electrode 100 is matched and disposed between the unipolar positive electrode 200 and the unipolar negative electrode 300; the separator 400 is disposed between adjacent electrodes.
[0043] The vertical bipolar cells are arranged in a "Z" shape with the uncoated area 105 as the bending part.
[0044] Furthermore, such as Figure 4 As shown, the unipolar positive electrode 200 includes a second current collector 201, several second positive electrode coating layers 202, and a first electrode tab 203. The second positive electrode coating layers 202 are disposed on one side of the second current collector 201, and the several second positive electrode coating layers 202 are alternately disposed with the uncoated area 105. The first electrode tab 203 is disposed at one end of the second current collector 201.
[0045] Furthermore, such as Figure 5 As shown, the unipolar negative electrode 300 includes a third current collector 301, several second negative electrode coating layers 302, and a second electrode tab 303. The second negative electrode coating layers 302 are disposed on one side of the third current collector 301, and the several second negative electrode coating layers 302 are alternately disposed with the uncoated area 105. The second electrode tab 303 is disposed at one end of the third current collector 301.
[0046] Furthermore, in the vertical bipolar cell, each positive electrode coating layer is smaller than the corresponding negative electrode coating layer, and the centers of each positive electrode coating layer and the corresponding negative electrode coating layer are the same. The positive electrode coating layer includes a first positive electrode coating layer and a second positive electrode coating layer; the negative electrode coating layer includes a first negative electrode coating layer and a second negative electrode coating layer.
[0047] Furthermore, the number of the first positive electrode coating layer 102 and the first negative electrode coating layer 103 on the first current collector 101 is the same; the number of the first positive electrode coating layer 102 is ≥2, and the number of the first negative electrode coating layer 103 is ≥2.
[0048] Further, the outer side of the first positive electrode coating layer 102 is provided with a first sealing insulation layer 104, which is fixed on the first current collector 101, facilitating subsequent lamination and sealing; similarly, the outer side of the first negative electrode coating layer 103 is provided with a first sealing insulation layer 104, which is fixed on the first current collector 101.
[0049] Further, the isolation film 400 is arranged between adjacent pole pieces, wherein the pole pieces include the bipolar pole piece 100, the single-polarity positive pole piece 200 and the single-polarity negative pole piece 300.
[0050] Further, the outer side of the pole piece is provided with a sealing insulation layer 500.
[0051] Further, the first tab 203 of the single-polarity positive pole piece 200 and the second tab 303 of the single-polarity negative pole piece 300 are arranged in opposite positions.
[0052] Further, the number of the bipolar pole piece 100 in the vertical bipolar battery is greater than or equal to 1.
[0053] Further, the electrolyte of the vertical bipolar battery is a liquid electrolyte.
[0054] Further, the battery in the utility model is one of a potassium ion battery, a lithium ion battery or a calcium ion battery and the like secondary battery.
[0055] Further, in the coating preparation of the coating layer of the pole piece, the positive and negative pole pastes are coated on both sides of the current collector respectively, an intermittent coating method is adopted, each positive pole coating layer is ensured to be smaller than the corresponding negative pole coating layer, and the positive pole coating layer is the same as the center of the corresponding negative pole coating layer; the whole can be coated in a staggered manner in the last coating, and a section of the positive pole coated on one side and a section of the negative pole coated on one side are reserved as single-polarity pole pieces at two ends; during die cutting, the single-polarity positive pole piece and the single-polarity negative pole piece need to have a tab, which is located at one side of each coating area, and the bipolar piece does not need to have a tab; the bipolar piece cut out by the die is composed of n positive pole coating layers and n negative pole coating layers (n>=2), and the positive and negative pole coating layers of the single-polarity pole piece and the bipolar piece are also n (n>=2); the outer side of the coating layer still needs to reserve a part of the current collector area which is not coated, so that the light foil area on both sides of the electrode piece after die cutting is adhered to the sealing insulation layer by spot hot melt glue, the sealing insulation layer is preliminarily fixed on the electrode piece, and subsequent lamination and sealing are facilitated.
[0056] During lamination, the single-polarity positive pole piece, the single-polarity negative pole piece and the bipolar pole piece are respectively placed in three feeding areas, all the positive poles of the pole pieces are upward, and the negative poles are downward (or the positive poles are downward, and the negative poles are upward), wherein the positions of the exposed tabs of the single-polarity positive pole piece and the single-polarity negative pole piece should be opposite; the number of bipolar pole pieces of each vertical bipolar battery is X (X is at least 1), the single-polarity positive pole piece and the single-polarity negative pole piece at two ends and the X bipolar pole pieces in the middle constitute a complete battery, the pole pieces are separated by a separation film, and the pole pieces are laminated in a zigzag shape.
[0057] During sealing, the insulation sealing layer is heated and sealed, and the separation film can also be fused, one side is not sealed and fused, and is used as a liquid injection port, and the positive and negative pole tabs led out by the end face are welded (it is ensured that the sealing material at the tab is melted to completely weld the tabs together), and the reserved liquid injection port is heat sealed after the liquid is formed.
[0058] After the battery is prepared, the battery is folded back and forth along the reserved uncoated area in a "Z" shape to reduce the length of the battery.
[0059] The high-capacity vertical bipolar battery of the utility model, the positive and negative pole materials are coated on the positive and negative sides of the current collector respectively, and are used as vertical bipolar pieces; the single-polarity positive pole piece, the single-polarity negative pole piece and the bipolar pole piece are laminated together to form a vertical bipolar battery, and the number of bipolar pole pieces in the vertical bipolar battery is X (X is at least 1); the light foil area outside the pole coating area is added with a sealing insulation layer, and the electrolyte between the positive and negative poles is locked in the inside after the sealing insulation layer is hot-pressed, so that liquid leakage and liquid channeling are avoided.
[0060] The utility model discloses a liquid electrolyte is used as electrolyte, has guaranteed lower interface impedance and higher ion conductance, adds sealed insulating layer to guarantee that liquid electrolyte will not appear the problem of liquid channeling, and long pole piece can improve the capacity of battery, and the several sections of uncoated area reserved in the middle can guarantee the infiltration problem of battery cell in the circulation process, also fold the battery conveniently, avoid the battery too long.
[0061] Compared with the prior art, the utility model has the following beneficial effects:
[0062] 1. The vertical bipolarity battery cell in the utility model, the pole piece is prolonged to one direction, but the uncoated blank current collector area is reserved in the middle, which improves the battery capacity and guarantees the infiltration in the coated area.
[0063] 2. The vertical bipolarity battery cell in the utility model is folded back and forth in the shape of "Z" along the uncoated blank current collector area, which can reduce the length of the battery cell, increase the capacity of the battery cell as a whole, and avoid the problem of too long battery cell.
[0064] The above only is the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A high capacity vertical bipolar battery, characterized by: The vertical bipolar battery cell comprises a bipolar electrode sheet, a monopolar positive electrode sheet, a monopolar negative electrode sheet, and a separator film. The bipolar electrode sheet comprises a first current collector, a plurality of first positive electrode coating layers, a plurality of first negative electrode coating layers, and a first sealing insulation layer; the first positive electrode coating layers and the first negative electrode coating layers are arranged on both sides of the first current collector, and the first positive electrode coating layers and the first negative electrode coating layers are arranged alternately with the uncoated areas. The monopolar positive electrode sheet and the monopolar negative electrode sheet are arranged on both sides of the unfolded vertical bipolar battery cell, and the bipolar electrode sheet is arranged between the monopolar positive electrode sheet and the monopolar negative electrode sheet; the separator film is arranged between adjacent electrode sheets. The vertical bipolar battery cell is arranged in a "Z" shape by folding the uncoated areas as the folding parts.
2. The high capacity vertical bipolar battery of claim 1, wherein: The monopolar positive electrode sheet comprises a second current collector, a plurality of second positive electrode coating layers, and a first tab; the second positive electrode coating layers are arranged on one side of the second current collector, and the second positive electrode coating layers are arranged alternately with the uncoated areas; and the first tab is arranged at one end of the second current collector.
3. The high capacity vertical bipolar battery of claim 1, wherein: The monopolar negative electrode sheet comprises a third current collector, a plurality of second negative electrode coating layers, and a second tab; the second negative electrode coating layers are arranged on one side of the third current collector, and the second negative electrode coating layers are arranged alternately with the uncoated areas; and the second tab is arranged at one end of the third current collector.
4. The high capacity vertical bipolar battery of claim 1, wherein: In the vertical bipolar battery cell, each positive electrode coating layer is smaller than the corresponding negative electrode coating layer, and the center of each positive electrode coating layer is the same as that of the corresponding negative electrode coating layer.
5. The high capacity vertical bipolar battery of claim 1, wherein: The number of the first positive electrode coating layers on the first current collector is consistent with that of the first negative electrode coating layers; the number of the first positive electrode coating layers is greater than or equal to 2, and the number of the first negative electrode coating layers is greater than or equal to 2.
6. The high capacity vertical bipolar battery of claim 1, wherein: The outer side of the first positive electrode coating layer is provided with a first sealing insulation layer; and the outer side of the first negative electrode coating layer is provided with a first sealing insulation layer.
7. The high capacity vertical bipolar battery of claim 1, wherein: The separator film is arranged between adjacent electrode sheets.
8. The high capacity vertical bipolar battery of claim 1, wherein: The outer side of the electrode sheet is provided with a sealing insulation layer. The electrolyte of the vertical bipolar battery cell is a liquid electrolyte.
9. The high capacity vertical bipolar battery of claim 1, wherein: The number of bipolar electrode sheets in the vertical bipolar battery cell is greater than or equal to 1.
10. The high capacity vertical bipolar battery of claim 1, wherein: The battery is one of a potassium ion battery, a lithium ion battery, or a calcium ion battery.