A helical horizontal bipolar cell structure

Abstract

This invention discloses a spiral horizontal bipolar battery cell structure, belonging to the field of battery technology. In the spiral horizontal bipolar battery cell structure, during the stacking and fabrication of the battery cell unit body, bipolar electrodes are spirally stacked in sequence, with the polarities of the coating areas of adjacent electrode layers opposite. Unipolar electrodes are positioned at the beginning and end of the stack, and a separator is placed between the coating areas of adjacent electrodes. Several stacked electrode layers, with uncoated areas as boundaries, constitute a battery cell unit body. The battery cell unit body is then wrapped with the aluminum-plastic film and injected with electrolyte to form a battery cell unit. The battery cell unit is constructed by spirally stacking the included bipolar electrodes to form the spiral horizontal bipolar battery cell structure. This invention solves the problem of excessive length when extending in a single direction by spirally stacking the bipolar electrode sheets and battery cell units; and alleviates the heat dissipation problem when the battery is too large by inserting heat sinks between the spiral battery cells.

Description

Technical Field

[0001] This invention belongs to the field of battery technology, and particularly relates to a spiral horizontal bipolar cell structure. Background Technology

[0002] With the large-scale application of lithium-ion batteries, the scarcity of domestic lithium resources and rising raw material prices have become significant factors restricting development and production. Although lithium prices have been declining since 2023, there is a possibility of a substantial increase due to international factors. Sodium-ion batteries, with their similar mechanism to lithium-ion batteries and abundant sodium resources, represent a very promising battery system and a good alternative.

[0003] Bipolar sodium-ion batteries can achieve high voltage and energy density in single cells. Horizontal bipolar batteries, in particular, coat the positive and negative electrodes on opposite sides of the same current collector, respectively. These electrodes can be stacked and extended in a staggered manner parallel to the current collector to form a series structure, thereby increasing the corresponding voltage. Simultaneously, the horizontal structure allows for parallel stacking of electrodes in a direction perpendicular to the current collector, increasing the cell capacity. However, the voltage increase of horizontal structure cells typically relies on staggered stacking of electrodes in one direction. As the operating voltage of the cell increases, the length of the cell in the horizontal direction continuously increases. Therefore, relying on stacking electrodes in only one direction makes it difficult to fabricate high-voltage cells. Summary of the Invention

[0004] This invention provides a spiral horizontal bipolar battery cell structure, aiming to solve problems such as existing horizontal battery structures extending only in one horizontal direction, difficulty in meeting high voltage requirements, and heat dissipation difficulties during battery charging and discharging. The spiral horizontal bipolar battery cell structure provided by this invention replaces the single horizontal extension with a spiral upward structure, preventing the high-voltage battery from having an excessively long cell. The cell interior is divided into chambers by sealant and sealed with an aluminum-plastic film, thus forming a spiral battery. Heat sinks can be added between adjacent upper and lower spiral chambers to achieve rapid heat dissipation.

[0005] The specific technical solution of the present invention is as follows:

[0006] A spiral-shaped horizontal bipolar battery cell structure includes a unipolar electrode, a bipolar electrode, a separator, an aluminum-plastic film, a heat sink, and a sealing area;

[0007] The unipolar electrode includes a unipolar positive electrode and a unipolar negative electrode;

[0008] The bipolar electrode includes a first current collector, a first positive electrode coating area, a first negative electrode coating area, and an uncoated area reserved between the first positive electrode coating area and the first negative electrode coating area; the first positive electrode coating area is coated on both sides of one end of the first current collector, and the first negative electrode coating area is coated on both sides of the other end of the first current collector.

[0009] In the process of stacking cells to prepare the cell unit body, the bipolar electrodes are spirally stacked in sequence, with the polarities of the coating areas of two adjacent electrode layers being opposite. The unipolar electrodes are placed at the beginning and end of the stack, and the separator is placed between the coating areas of adjacent electrodes. Several layers of stacked electrodes form a cell unit body with the uncoated area as the boundary.

[0010] The battery cell unit body is wrapped with the aluminum-plastic film and then injected with electrolyte to form a battery cell unit; the battery cell unit is based on the spiral stacking of the included bipolar electrodes to form a spiral horizontal bipolar battery cell structure; the heat sink is provided between the spirally stacked battery cell units, and a sealing area is provided at the uncoated area of ​​the bipolar electrodes between the battery cell units.

[0011] Preferably, the sequential spiral overlapping specifically involves overlapping the first positive electrode coating area of ​​one bipolar electrode with the first negative electrode coating area of ​​another bipolar electrode, and overlapping the first negative electrode coating area of ​​one bipolar electrode with the first positive electrode coating area of ​​yet another bipolar electrode, in a spiral overlapping manner; when the overlapping end is the first positive electrode coating area of ​​a bipolar electrode, it overlaps with the unipolar negative electrode; when the overlapping end is the first negative electrode coating area of ​​a bipolar electrode, it overlaps with the unipolar positive electrode; the several layers of overlapping electrodes form a cell unit body with the uncoated area as the boundary; wherein, the first bipolar electrode, the second bipolar electrode, and the third bipolar electrode are three independent bipolar plates with the same structure.

[0012] Preferably, the heat sink is longitudinally disposed between adjacent stacked battery cells. More preferably, the heat sink is composed of a thermally conductive material, preferably thermally conductive silicone.

[0013] Preferably, the sealing area is provided between the battery cells laterally; the uncoated area in the middle of the bipolar electrode passes through the sealing area so that two adjacent battery cells can be connected, and ultimately all battery cells can be connected in series.

[0014] Preferably, a sealant is used to bond the uncoated area within the battery cell body, and the sealant is bonded to the aluminum-plastic film that wraps the battery cell body on the outside, so as to isolate the battery cell bodies from each other. The sealant divides the battery cell body into individual battery cell units; and the tabs of the first and last unipolar electrodes are welded and led out to the outside of the aluminum-plastic film.

[0015] Preferably, in this invention, after the aluminum-plastic film is wrapped around the battery cell body and the electrolyte, a heat-sealing process is performed to prevent electrolyte leakage.

[0016] Preferably, the unipolar electrode is disposed at the overlapping beginning and end, specifically, the unipolar electrode and bipolar electrode at the beginning and end of the cell unit overlap each other, and the middle cell unit is composed of bipolar electrodes arranged alternately.

[0017] Preferably, the unipolar positive electrode sheet consists of a second current collector and a second positive electrode coating layer coated on both sides of the second current collector, and a first tab is provided on the second current collector.

[0018] Preferably, the unipolar negative electrode sheet is composed of a third current collector and a second negative electrode coating layer coated on both sides of the third current collector, and a second tab is provided on the third current collector.

[0019] Preferably, during electrode die-cutting, the unipolar positive and unipolar negative electrodes retain tabs, while the bipolar electrodes do not retain tabs.

[0020] When applying the coating layer, positive and negative electrode slurries are coated on both sides of the current collector, respectively. Preferably, in the bipolar electrode sheet, the length and width of the first positive electrode coating layer are both smaller than the first negative electrode coating layer. More preferably, according to the requirements of the horizontal and vertical bipolar electrode sheet, a blank uncoated area is left between the first positive electrode coating area and the first negative electrode coating area of ​​the bipolar electrode sheet.

[0021] Preferably, the unipolar or bipolar electrode on the end face of each battery cell is coated with active material on only one side, while the middle electrode (including unipolar and bipolar electrode) is coated with active material on both sides (i.e., positive electrode coating area and negative electrode coating area).

[0022] Preferably, the number of electrode layers and capacity in adjacent cell units are consistent; more preferably, the shape of the entire spiral horizontal bipolar cell structure in this invention can be designed and improved according to actual needs, and in practical applications, the commonly used square shape can be changed to other polygons or even curved polygons.

[0023] Preferably, the heat sink is disposed between the upper and lower cell units. The spiral-shaped horizontal bipolar cell in this invention, converted from the commonly used straight-line shape to a spiral shape, reduces the specific surface area of ​​the entire cell, making heat dissipation more difficult. Therefore, a heat sink is disposed between the upper and lower cell units of the spiral battery to improve heat dissipation performance.

[0024] In the fabrication process of the spiral horizontal bipolar cell structure of this invention: when coating the electrode plate, positive and negative electrode slurries should be coated on both sides of the current collector, respectively. The length and width of the positive electrode coating area should be smaller than those of the negative electrode coating area. A blank area (i.e., an uncoated area) is left between the positive and negative electrode coating areas according to the requirements of the horizontal and vertical bipolar electrodes. During die-cutting, the tabs of the unipolar positive and unipolar negative electrodes are retained, while the tabs of the bipolar electrodes are not retained. The unipolar and bipolar electrodes on the end face of each cell unit are coated with active material on only one side, while the electrodes in the middle (excluding the end face) are coated with active material on both sides.

[0025] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0026] The spiral horizontal bipolar cell structure of this invention solves the problems of existing horizontal battery structures that extend only in one horizontal direction, making it difficult to meet high voltage requirements and causing heat dissipation difficulties during charging and discharging. By using a spiral upward structure instead of a single horizontal extension, the high-voltage battery produced avoids the problem of excessively long cells. Furthermore, the spiral horizontal bipolar cell is internally divided into chambers by sealant and sealed with an aluminum-plastic film, thus forming a spiral battery. Heat sinks can be added between adjacent upper and lower spiral chambers to achieve rapid heat dissipation.

[0027] The spiral horizontal bipolar battery cell structure of this invention uses a spirally stacked arrangement of bipolar electrode sheets and battery cell units. The internal structure is divided into multiple battery cell unit chambers by sealant, and the connected battery cell unit chambers are connected by an uncoated area passing through the sealant. This solves the problem of excessive length when extending in one direction. A material with good thermal conductivity is inserted between the spiral battery cell units as a heat sink to assist in the heat dissipation of the bipolar battery cell and alleviate the heat dissipation problem when the battery is too large. Furthermore, while ensuring that the number of battery cell layers and capacity are consistent, the shape of the battery can be flexibly designed according to actual needs, and can be designed as a polygon or even a curved polygon. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 These are a front view and a cross-sectional view of a unipolar electrode sheet according to an embodiment of the present invention; wherein, A is a front view of the unipolar positive electrode sheet, B is a front view of the unipolar negative electrode sheet, C is a cross-sectional view of the unipolar positive electrode sheet, and D is a cross-sectional view of the unipolar negative electrode sheet.

[0030] Figure 2 A is a front view and a cross-sectional view of a bipolar electrode according to an embodiment of the present invention; wherein, A is a front view of the bipolar electrode and B is a cross-sectional view of the bipolar electrode.

[0031] Figure 3 This is a cross-sectional schematic diagram of a battery cell unit according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the end face and cross section of a spiral horizontal bipolar battery cell structure according to an embodiment of the present invention; wherein, A is an end face view of the spiral horizontal bipolar battery cell structure; and B is a cross section view of the spiral horizontal bipolar battery cell structure. Detailed Implementation

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, top, bottom, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] It should be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0037] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0038] Horizontal bipolar batteries are typically stacked in a horizontal direction to increase voltage. As voltage requirements increase, the length of the bipolar battery also gradually increases. Therefore, extending in only one direction is insufficient to meet high-voltage demands. In this invention, the original straight extension is optimized into a spiral extension, thus avoiding the problem of excessive length in one direction when manufacturing high-voltage batteries. The number of layers and capacity of adjacent cell units in the spiral cell remain consistent. The shape of the entire cell can be designed and modified according to actual needs. In practical applications, this allows the original square shape to be changed to other polygons, or even curved polygons.

[0039] Example

[0040] like Figures 1 to 4 As shown, this embodiment of the invention provides a spiral horizontal bipolar battery cell structure, including a unipolar electrode 100, a bipolar electrode 200, a separator 300, an aluminum-plastic film 400, a heat sink 500, and a sealing area 600.

[0041] The unipolar electrode 100 includes a unipolar positive electrode 110 and a unipolar negative electrode 120;

[0042] The bipolar electrode 200 includes a first current collector 201, a first positive electrode coating area 202, a first negative electrode coating area 203, and an uncoated area 204 reserved between the first positive electrode coating area 202 and the first negative electrode coating area 203; the first positive electrode coating area 202 is coated on both sides of one end of the first current collector 201, and the first negative electrode coating area 203 is coated on both sides of the other end of the first current collector 201;

[0043] When the battery cell body is fabricated by stacking, the bipolar electrode sheets 200 are spirally stacked in sequence, with the polarities of the coating areas of two adjacent electrode sheets being opposite. The unipolar electrode sheets 100 are disposed at the beginning and end of the stack, and the separator 300 is disposed between the coating areas of adjacent electrode sheets. Several layers of stacked electrode sheets form a battery cell body 700 with the uncoated area 204 as the boundary.

[0044] The battery cell unit body is wrapped by the aluminum-plastic film 400 and then injected with electrolyte 410 to form a battery cell unit 800; the battery cell unit is based on the included bipolar electrode 200, which are spirally stacked to form a spiral horizontal bipolar battery cell structure; the heat sink 500 is provided between the spirally stacked battery cell units, and a sealing area 600 is provided at the uncoated area 204 of the bipolar electrode between the battery cell units.

[0045] Preferably, the sequential spiral overlapping specifically involves overlapping the first positive electrode coating area 202 of one bipolar electrode 200 with the first negative electrode coating area 203 of another bipolar electrode 200, and overlapping the first negative electrode coating area 203 of one bipolar electrode 200 with the first positive electrode coating area 202 of yet another bipolar electrode 200, and so on in a spiral manner. When the overlapping end is the first positive electrode coating area 202 of the bipolar electrode 200, it overlaps with the unipolar negative electrode 120; when the overlapping end is the first negative electrode coating area 203 of the bipolar electrode 200, it overlaps with the unipolar positive electrode 110. The several layers of overlapping electrodes form a battery cell unit body with the uncoated area 204 as the boundary. Among them, the first bipolar electrode 200, the second bipolar electrode 200, and the third bipolar electrode 200 are three independent bipolar plates 300 with the same structure.

[0046] Preferably, the heat sink 500 is longitudinally disposed between adjacent stacked battery cell units 800. More preferably, the heat sink 500 is composed of a thermally conductive material, preferably thermally conductive silicone.

[0047] Preferably, the sealing area 600 is provided between the battery cells 800 laterally; the uncoated area 204 in the middle of the bipolar electrode 200 passes through the sealing area 600 so that two adjacent battery cells 800 are connected, and finally all battery cells can be connected in series.

[0048] Preferably, a sealant is used to bond the uncoated area 204 within the battery cell body 700, and the sealant is bonded to the aluminum-plastic film 400 that wraps the battery cell body 700 on the outside, so that the battery cell bodies 700 are isolated from each other; the sealant divides the battery cell body 700 into individual battery cell units 800; and the tabs of the first and last unipolar electrode sheets 100 are welded and led out to the outside of the aluminum-plastic film 400.

[0049] Preferably, in this invention, after the aluminum-plastic film 500 is wrapped around the battery cell body and the electrolyte, a heat-sealing process is performed to prevent the electrolyte from leaking.

[0050] Preferably, the unipolar electrode is disposed at the overlapping beginning and end, specifically, the unipolar electrode 100 and bipolar electrode 200 at the beginning and end of the cell unit 800 overlap each other, and the cell unit 800 in the middle is composed of bipolar electrode 200 arranged alternately.

[0051] Preferably, the unipolar positive electrode 110 is composed of a second current collector 111 and a second positive electrode coating layer 112 coated on both sides of the second current collector 111, and a first tab 113 is provided on the second current collector 111.

[0052] Preferably, the unipolar negative electrode 120 is composed of a third current collector 121 and a second negative electrode coating layer 122 coated on both sides of the third current collector 121, and a second tab 123 is provided on the third current collector 121.

[0053] That is, during the die-cutting of the electrode sheet, the unipolar positive electrode 110 and the unipolar negative electrode 120 retain the tabs, while the bipolar electrode sheet 200 does not retain the tabs.

[0054] During the coating process, positive and negative electrode slurries are coated on both sides of the current collector, respectively. Preferably, in the bipolar electrode 200, the length and width of the first positive electrode coating layer 202 are both smaller than those of the first negative electrode coating layer 203. More preferably, according to the requirements of the bipolar electrode 200, a blank uncoated area 204 is left between the first positive electrode coating area 202 and the first negative electrode coating area 203 of the bipolar electrode 200.

[0055] Preferably, the unipolar electrode 100 or bipolar electrode 200 on the end face of each of the battery cells 800 is coated with active material on only one side, while the middle electrodes (including unipolar electrode 100 and bipolar electrode 200) except for the end face are coated with active material on both sides (i.e., positive electrode coating area and negative electrode coating area).

[0056] Preferably, the number of electrode layers and capacity in adjacent cell units 800 are consistent; more preferably, the shape of the entire spiral horizontal bipolar cell structure in this invention can be designed and improved according to actual needs, and in practical applications, the commonly used square shape can be changed to other polygons or even curved polygons.

[0057] Preferably, the heat sink is disposed between the upper and lower cell units 800. The spiral-shaped horizontal bipolar cell of this invention, converted from the commonly used straight-line shape to a spiral shape, also reduces the specific surface area of ​​the entire cell, making heat dissipation more difficult. Therefore, a heat sink is disposed between the upper and lower cell units of the spiral battery to improve heat dissipation performance.

[0058] In the fabrication process of the spiral horizontal bipolar cell structure of this invention: when coating the electrode plate, positive and negative electrode slurries should be coated on both sides of the current collector, respectively. The length and width of the positive electrode coating area should be smaller than those of the negative electrode coating area. A blank area (i.e., an uncoated area) is left between the positive and negative electrode coating areas according to the requirements of the horizontal and vertical bipolar electrodes. During die-cutting, the tabs of the unipolar positive and unipolar negative electrodes are retained, while the tabs of the bipolar electrodes are not retained. The unipolar and bipolar electrodes on the end face of each cell unit are coated with active material on only one side, while the electrodes in the middle (excluding the end face) are coated with active material on both sides.

[0059] In another embodiment, a solid electrolyte can be used inside the battery cell unit to replace the original battery cell unit's separator and electrolyte. However, sealant is still needed on both sides to separate the battery cell units and to fix the electrodes and solid electrolyte together. In this way, stacking can be completed simply by inserting the solid electrolyte between the positive and negative electrodes.

[0060] In another embodiment, to facilitate coating roller pressing, the single-sided coated end face electrode can be replaced with a double-sided coated electrode.

[0061] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0062] The spiral horizontal bipolar cell structure of this invention solves the problems of existing horizontal battery structures that extend only in one horizontal direction, making it difficult to meet high voltage requirements and causing heat dissipation difficulties during charging and discharging. By using a spiral upward structure instead of a single horizontal extension, the high-voltage battery produced avoids the problem of excessively long cells. Furthermore, the spiral horizontal bipolar cell is internally divided into chambers by sealant and sealed with an aluminum-plastic film, thus forming a spiral battery. Heat sinks can be added between adjacent upper and lower spiral chambers to achieve rapid heat dissipation.

[0063] The spiral horizontal bipolar battery cell structure of this invention uses a spirally stacked arrangement of bipolar electrode sheets and battery cell units. The internal structure is divided into multiple battery cell unit chambers by sealant, and the connected battery cell unit chambers are connected by an uncoated area passing through the sealant. This solves the problem of excessive length when extending in one direction. A material with good thermal conductivity is inserted between the spiral battery cell units as a heat sink to assist in the heat dissipation of the bipolar battery cell and alleviate the heat dissipation problem when the battery is too large. Furthermore, while ensuring that the number of battery cell layers and capacity are consistent, the shape of the battery can be flexibly designed according to actual needs, and can be designed as a polygon or even a curved polygon.

[0064] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0065] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0066] 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 within the protection scope of the present invention.

Claims

1. A spiral-shaped horizontal bipolar battery cell structure, characterized in that: It includes unipolar electrodes, bipolar electrodes, diaphragms, aluminum-plastic films, heat sinks, and sealing areas; The unipolar electrode includes a unipolar positive electrode and a unipolar negative electrode; The bipolar electrode includes a first current collector, a first positive electrode coating layer, a first negative electrode coating layer, and an uncoated area reserved between the first positive electrode coating layer and the first negative electrode coating layer; the first positive electrode coating layer is coated on both sides of one end of the first current collector, and the first negative electrode coating layer is coated on both sides of the other end of the first current collector. In the process of stacking cells to prepare the cell unit body, the bipolar electrodes are spirally stacked in sequence, with the polarities of the coating layers of two adjacent electrodes being opposite. The unipolar electrodes are disposed at the beginning and end of the stack, and the separator is disposed between the coating layers of adjacent electrodes. Several stacked electrodes form a cell unit body with the uncoated area as the boundary. The battery cell unit body is wrapped with the aluminum-plastic film and then injected with electrolyte to form a battery cell unit; the battery cell unit is based on the spiral stacking of the included bipolar electrodes to form a spiral horizontal bipolar battery cell structure; the heat sink is provided between the spirally stacked battery cell units, and a sealing area is provided at the uncoated area of ​​the bipolar electrodes between the battery cell units.

2. The spiral horizontal bipolar cell structure according to claim 1, characterized in that: The sequential spiral overlapping specifically involves overlapping the first positive electrode coating layer of one bipolar electrode with the first negative electrode coating layer of another bipolar electrode, and overlapping the first negative electrode coating layer of one bipolar electrode with the first positive electrode coating layer of yet another bipolar electrode, in a spiral overlapping manner. When the overlapping end is the first positive electrode coating layer of a bipolar electrode, it overlaps with the unipolar negative electrode; when the overlapping end is the first negative electrode coating layer of a bipolar electrode, it overlaps with the unipolar positive electrode. The several layers of overlapping electrodes form a cell unit body with the uncoated area as the boundary. Among them, the first bipolar electrode, the second bipolar electrode, and the third bipolar electrode are three independent bipolar plates with the same structure.

3. The spiral horizontal bipolar cell structure according to claim 1, characterized in that: The heat sink is arranged longitudinally between the stacked adjacent battery cells.

4. The spiral horizontal bipolar cell structure according to claim 1, characterized in that: The heat sink is composed of a thermally conductive material, which is thermally conductive silicone.

5. The spiral horizontal bipolar cell structure according to claim 1, characterized in that: The sealing area is provided between the battery cells laterally; the uncoated area in the middle of the bipolar electrode passes through the sealing area so that two adjacent battery cells can be connected, and finally all the battery cells can be connected in series.

6. The spiral horizontal bipolar cell structure according to claim 1, characterized in that: The uncoated areas inside the battery cell body are bonded with sealant, and the sealant is bonded to the aluminum-plastic film that wraps the battery cell body on the outside, so as to isolate the battery cell bodies from each other.

7. The spiral horizontal bipolar cell structure according to claim 1, characterized in that: The unipolar electrode is disposed at the overlapping beginning and end, specifically, the unipolar electrode and bipolar electrode at the beginning and end of the cell unit overlap each other, while the middle cell unit is composed of bipolar electrodes arranged alternately.

8. The spiral horizontal bipolar cell structure according to claim 1, characterized in that: The unipolar positive electrode sheet consists of a second current collector and a second positive electrode coating layer coated on both sides of the second current collector, and a first tab is provided on the second current collector; The unipolar negative electrode sheet consists of a third current collector and a second negative electrode coating layer coated on both sides of the third current collector, and a second tab is provided on the third current collector.

9. The spiral horizontal bipolar cell structure according to claim 1, characterized in that: In the bipolar electrode, the length and width of the first positive electrode coating layer are both smaller than those of the first negative electrode coating layer.

10. The spiral horizontal bipolar cell structure according to claim 1, characterized in that: The number of electrode layers and capacity are kept consistent in adjacent battery cell units.

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