Spiral horizontal bipolar battery cell structure

Abstract

The invention discloses a spiral horizontal bipolar battery cell structure, and belongs to the technical field of batteries. According to the spiral horizontal bipolar battery cell structure, when a battery cell unit body is prepared through lamination, bipolar pole pieces are spirally overlapped in sequence, the polarities of coating areas of two vertically adjacent layers of pole pieces are opposite, unipolar pole pieces are arranged at the head end and the tail end of overlapping, and a diaphragm is arranged between the coating areas of the adjacent pole pieces; a plurality of layers of overlapped pole pieces form a battery cell unit body by taking the non-coating areas as boundaries; the battery cell unit body is wrapped by the aluminum plastic film and then is injected with electrolyte to form a battery cell unit; and the battery cell units are spirally overlapped based on the contained bipolar pole pieces to form the spiral horizontal bipolar battery cell structure. According to the invention, the bipolar electrode plates and the battery cell units are stacked and arranged in a spiral rising manner, so that the problem that the length is too long when the battery extends in a single direction is solved; and the cooling fins are inserted among the spiral battery cell units, so that the problem of heat dissipation when the battery is too large is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a spiral horizontal bipolar battery cell structure. Background Art

[0002] With the large-scale application of lithium-ion batteries, the shortage of domestic lithium resources and the rising prices of raw materials have become important factors restricting development and production. Although lithium prices have continued to fall since 2023, they are likely to increase significantly due to the influence of the international environment. Sodium-ion batteries have a similar mechanism to lithium-ion batteries and are rich in sodium resources. They are a very promising battery system and a good substitute solution.

[0003] Bipolar sodium-ion batteries can achieve higher voltage and energy density in single cells. Among them, horizontal bipolar batteries are coated with positive and negative electrodes on the left and right sides of the same surface of the current collector, respectively, and can be stacked and extended in parallel with the pole pieces to form a series structure to increase the corresponding voltage. At the same time, the horizontal structure can stack the pole pieces in parallel in a direction perpendicular to the pole pieces to increase the cell capacity. However, the increase in the voltage of horizontal structure cells usually depends on extending the staggered stacked pole pieces in one direction. As the working voltage of the prepared cell increases, the length of the cell in the horizontal direction will continue to increase. Therefore, it is difficult to prepare high-voltage cells by relying on extending the stacked pole pieces in one direction. Summary of the invention

[0004] An embodiment of the present invention provides a spiral horizontal bipolar battery cell structure, which aims to solve the problems that the existing horizontal structure battery only extends in one horizontal direction, is difficult to meet the high voltage requirements, and has difficulty in heat dissipation during battery charging and discharging. The spiral horizontal bipolar battery cell structure provided by the present invention replaces the single horizontal extension by a spiral rise, so that the prepared high-voltage battery does not have the problem of the battery cell being too long. The interior of the battery cell is divided into chambers by sealant and sealed by aluminum-plastic film, thus forming a spiral battery. Heat sinks can be added between the upper and lower adjacent spiral chambers to achieve the purpose of rapid heat dissipation.

[0005] The specific technical solutions of the present invention are as follows:

[0006] A spiral horizontal bipolar battery cell structure, comprising a unipolar pole piece, a bipolar pole piece, a diaphragm, an aluminum-plastic film, a heat sink and a sealing area;

[0007] The unipolar pole piece includes a unipolar positive pole piece and a unipolar negative pole piece;

[0008] The bipolar pole piece comprises a first current collector, a first positive electrode coating region, a first negative electrode coating region, and a non-coating region reserved between the first positive electrode coating region and the first negative electrode coating region; the first positive electrode coating region is coated on both sides of one end of the first current collector, and the first negative electrode coating region is coated on both sides of the other end of the first current collector;

[0009] When stacking the sheets to prepare the battery cell unit body, the bipolar pole pieces are overlapped in spiral order, the polarities of the coating areas of the two adjacent layers of pole pieces are opposite, the unipolar pole pieces are arranged at the head and tail ends of the overlap, and the diaphragm is arranged between the coating areas of the adjacent pole pieces; several layers of stacked pole pieces are bounded by the uncoated area to form a battery cell unit body;

[0010] The battery cell unit body is wrapped by the aluminum-plastic film and then injected with electrolyte to form a battery cell unit; the battery cell units are spirally overlapped based on the bipolar pole pieces contained therein to form a spiral horizontal bipolar battery cell structure; the heat sink is arranged between the spirally stacked battery cell units, and a sealing area is arranged at the uncoated area of ​​the bipolar pole pieces between the battery cell units.

[0011] Preferably, the spiral overlapping in sequence is specifically that the first positive coating area of ​​a bipolar pole piece overlaps with the first negative coating area of ​​another bipolar pole piece, and the first negative coating area of ​​a bipolar pole piece overlaps with the first positive coating area of ​​another bipolar pole piece, and the spiral overlapping is in sequence; when the overlapping end is the first positive coating area of ​​the bipolar pole piece, it overlaps with the unipolar negative pole piece; when the overlapping end is the first negative coating area of ​​the bipolar pole piece, it overlaps with the unipolar positive pole piece; several layers of stacked pole pieces form a battery cell unit body with the uncoated area as the boundary; wherein the bipolar pole piece, another bipolar pole piece and another bipolar pole piece are three independent bipolar pole plates with the same structure.

[0012] Preferably, the heat sink is longitudinally arranged between the stacked adjacent battery core units. Further preferably, the heat sink is made of a heat-conducting material, and the heat-conducting material is preferably heat-conducting silica gel.

[0013] Preferably, the sealing area is arranged between the battery cell units in the transverse direction; the uncoated area in the middle of the bipolar pole piece passes through the sealing area to connect two adjacent battery cell units, and finally all the battery cell units can be connected in series.

[0014] Preferably, the non-coated area in the battery cell body is bonded with a sealant, and the sealant is bonded to the aluminum-plastic film that wraps the battery cell body on the outside, so that the battery cell bodies are isolated from each other. The sealant separates the battery cell body into individual battery cell monomers; and the pole tabs of the first and last single-polarity pole pieces are welded and led out of the aluminum-plastic film.

[0015] Preferably, the present invention uses the aluminum-plastic film to wrap the battery unit body and the electrolyte, and then performs a heat-sealing treatment to prevent the electrolyte from leaking.

[0016] Preferably, the unipolar pole pieces are arranged at the overlapping head and tail ends, specifically, the unipolar pole pieces and bipolar pole pieces at the head and tail ends of the battery cell unit overlap each other, and the middle battery cell unit is arranged with bipolar pole pieces in an alternating manner.

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

[0018] Preferably, the monopolar 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 electrode tab is provided on the third current collector.

[0019] Preferably, when the pole pieces are die-cut, the unipolar positive electrode and the unipolar negative electrode retain the pole ears, while the bipolar pole piece does not retain the pole ears.

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

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

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

[0023] Preferably, the heat sink is disposed between the upper and lower battery cells. The spiral horizontal bipolar battery cell in the present invention is converted from the commonly used straight shape to a spiral shape, which also reduces the specific surface area of ​​the entire battery cell, which makes it more difficult for the battery to dissipate heat. Therefore, a heat sink is disposed between the upper and lower battery cells of the spiral battery to improve the heat dissipation performance.

[0024] During the preparation of the spiral horizontal bipolar battery cell structure of the present invention: when coating the coating area of ​​the electrode plate, the positive and negative electrode slurries should be coated on both sides of the current collector respectively, wherein the length and width of the positive electrode coating area should be smaller than the negative electrode coating area, and a blank area (i.e., no coating area) is left between the positive electrode coating area and the negative electrode coating area according to the requirements of the horizontal and vertical bipolar pole pieces. During die-cutting, the unipolar positive electrode and the unipolar negative electrode retain the pole ears, while the bipolar pole pieces do not retain the pole ears. The unipolar pole pieces and bipolar pole pieces on the end faces of each battery cell unit are only coated with active materials on one side, while the middle pole pieces except the end faces are coated with active materials on both sides.

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

[0026] The spiral horizontal bipolar battery structure of the present invention solves the problems that the existing horizontal structure battery only extends in one horizontal direction, is difficult to meet the high voltage requirements, and has difficulty in heat dissipation during battery charging and discharging. By using a spiral rise method to replace the single horizontal extension, the prepared high-voltage battery will not have the problem of the battery cell being too long; and the interior of the spiral horizontal bipolar battery is divided into chambers by sealant and sealed by aluminum-plastic film, thus forming a spiral battery. Heat sinks can be added between the upper and lower adjacent spiral chambers to achieve the purpose of rapid heat dissipation.

[0027] The spiral horizontal bipolar battery cell structure of the present invention is arranged by spirally ascending and stacking bipolar electrode sheets and battery cell units, and the entire battery cell is divided into a plurality of battery cell unit chambers by a sealant inside, and the connected battery cell unit chambers are connected by an uncoated area passing through the sealant; the problem of excessive length when extending in a single direction is solved; a material with good thermal conductivity is inserted as a heat sink between the spiral battery cell units to assist the bipolar battery cell in heat dissipation, thereby alleviating the heat dissipation problem when the battery is too large; and under the premise of ensuring that the number of layers and capacity of each battery cell unit 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 It is a front view and a cross-sectional view of a unipolar pole piece of an embodiment of the present invention; wherein A is a front view of a unipolar positive pole piece, B is a front view of a unipolar negative pole piece, C is a cross-sectional view of a unipolar positive pole piece, and D is a cross-sectional view of a unipolar negative pole piece.

[0030] Figure 2 1 is a front view and a cross-sectional view of a bipolar pole piece according to an embodiment of the present invention; wherein A is a front view of the bipolar pole piece, and B is a cross-sectional view of the bipolar pole piece.

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

[0032] Figure 4 It is a schematic diagram of the end face and cross-section of a spiral horizontal bipolar battery cell structure of 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 DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0035] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] Horizontal bipolar batteries are usually stacked and extended in a horizontal direction to increase the voltage of the battery. As the voltage demand increases, the length of the bipolar battery gradually increases. Therefore, the method of extending in only one direction is difficult to meet the high voltage demand. In the embodiment of the present invention, the original straight line extension is optimized to a spiral extension, which can avoid the problem of excessive length in one direction when preparing a high-voltage battery. The number of layers and capacity of adjacent battery cells in the spiral battery cell can be kept consistent, and the shape of the entire battery cell can be designed and improved according to actual needs. In practical applications, the original square can be changed to other polygons or even curved polygons.

[0039] Example

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

[0041] The monopolar pole piece 100 includes a monopolar positive pole piece 110 and a monopolar negative pole piece 120;

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

[0043] When stacking the sheets to prepare the cell unit body, the bipolar pole pieces 200 are overlapped in a spiral in sequence, the polarities of the coating areas of the two adjacent layers of pole pieces are opposite, the unipolar pole pieces 100 are arranged at the head and tail ends of the overlap, and the diaphragm 300 is arranged between the coating areas of the adjacent pole pieces; the stacked pole pieces form a cell unit 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 spirally overlapped based on the bipolar pole pieces 200 contained therein to form a spiral horizontal bipolar battery cell structure; the heat sink 500 is arranged between the spirally stacked battery cell units, and a sealing area 600 is arranged at the uncoated area 204 of the bipolar pole pieces between the battery cell units.

[0045] Preferably, the spiral overlapping in sequence is specifically that the first positive coating area 202 of a bipolar pole piece 200 overlaps with the first negative coating area 203 of another bipolar pole piece 200, and the first negative coating area 203 of a bipolar pole piece 200 overlaps with the first positive coating area 202 of another bipolar pole piece 200, and the spiral overlapping is in sequence; when the overlapping end is the first positive coating area 202 of the bipolar pole piece 200, it overlaps with the unipolar negative electrode sheet 120; when the overlapping end is the first negative coating area 203 of the bipolar pole piece 200, it overlaps with the unipolar positive electrode sheet 110; several layers of stacked pole pieces form a battery cell unit body with the uncoated area 204 as the boundary; wherein the bipolar pole piece 200, another bipolar pole piece 200 and another bipolar pole piece 200 are three independent bipolar plates 300 with the same structure.

[0046] Preferably, the heat sink 500 is longitudinally disposed between the stacked adjacent battery core units 800. Further preferably, the heat sink 500 is made of a heat conductive material, and the heat conductive material is preferably heat conductive silica gel.

[0047] Preferably, the sealing area 600 is arranged laterally between the battery cell units 800; the uncoated area 204 in the middle of the bipolar pole piece 200 passes through the sealing area 600 to connect two adjacent battery cell units 800, and finally all the battery cell units can be connected in series.

[0048] Preferably, the uncoated area 204 in the battery cell body 700 is bonded with a sealant, 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 separates the battery cell body 700 into individual battery cell 800 monomers; and the pole ears of the single-polarity pole pieces 100 at the head and tail are welded and led out of the aluminum-plastic film 400.

[0049] Preferably, the present invention uses the aluminum-plastic film 500 to wrap the battery cell unit body and the electrolyte, and then performs heat sealing treatment to prevent the electrolyte from leaking.

[0050] Preferably, the unipolar pole pieces are arranged at the overlapping head and tail ends, specifically, the unipolar pole pieces 100 and the bipolar pole pieces 200 at the head and tail ends of the battery cell unit 800 overlap each other, and the middle battery cell unit 800 is composed of bipolar pole pieces 200 arranged in an alternating manner.

[0051] Preferably, the monopolar positive electrode sheet 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 electrode tab 113 is disposed on the second current collector 111 .

[0052] Preferably, the monopolar negative electrode sheet 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 electrode tab 123 is disposed on the third current collector 121 .

[0053] That is, when the pole pieces are die-cut, the unipolar positive electrode 110 and the unipolar negative electrode 120 retain the pole tabs, while the bipolar pole piece 200 does not retain the pole tabs.

[0054] When coating the coating layer, the positive and negative electrode slurries are coated on both sides of the current collector respectively; preferably, in the bipolar pole piece 200, the length and width of the first positive electrode coating layer 202 are smaller than the first negative electrode coating layer 203. Further preferably, according to the requirements of the horizontal and vertical bipolar pole piece 200, a blank non-coated area 204 is left between the first positive electrode coating area 202 and the first negative electrode coating area 203 of the bipolar pole piece 200.

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

[0056] Preferably, the number of electrode layers and the capacity in adjacent battery cell units 800 remain consistent; further preferably, the shape of the entire spiral horizontal bipolar battery cell structure in the present 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 battery cells 800. The spiral horizontal bipolar battery cell in the present invention is converted from the commonly used straight shape to a spiral shape, which also reduces the specific surface area of ​​the entire battery cell, which makes it more difficult to dissipate heat from the battery. Therefore, a heat sink is disposed between the upper and lower battery cells of the spiral battery to improve the heat dissipation performance.

[0058] During the preparation of the spiral horizontal bipolar battery cell structure of the present invention: when coating the coating area of ​​the electrode plate, the positive and negative electrode slurries should be coated on both sides of the current collector respectively, wherein the length and width of the positive electrode coating area should be smaller than the negative electrode coating area, and a blank area (i.e., no coating area) is left between the positive electrode coating area and the negative electrode coating area according to the requirements of the horizontal and vertical bipolar pole pieces. During die-cutting, the unipolar positive electrode and the unipolar negative electrode retain the pole ears, while the bipolar pole pieces do not retain the pole ears. The unipolar pole pieces and bipolar pole pieces on the end faces of each battery cell unit are only coated with active materials on one side, while the middle pole pieces except the end faces are coated with active materials on both sides.

[0059] In another embodiment, the inside of the battery cell can be replaced with a solid electrolyte to replace the separator and electrolyte of the original battery cell. However, a sealant is still required to separate the battery cell on the left and right sides, and to fix the electrode sheet and the solid electrolyte to each other. In this way, the stacking can be completed by simply inserting the solid electrolyte between the positive and negative electrodes.

[0060] In another embodiment, in order to facilitate coating and rolling, the end surface electrode piece coated on one side can be changed to a double-sided coated electrode piece.

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

[0062] The spiral horizontal bipolar battery structure of the present invention solves the problems that the existing horizontal structure battery only extends in one horizontal direction, is difficult to meet the high voltage requirements, and has difficulty in heat dissipation during battery charging and discharging. By using a spiral rise method to replace the single horizontal extension, the prepared high-voltage battery will not have the problem of the battery cell being too long; and the interior of the spiral horizontal bipolar battery is divided into chambers by sealant and sealed by aluminum-plastic film, thus forming a spiral battery. Heat sinks can be added between the upper and lower adjacent spiral chambers to achieve the purpose of rapid heat dissipation.

[0063] The spiral horizontal bipolar battery cell structure of the present invention is arranged by spirally ascending and stacking bipolar electrode sheets and battery cell units, and the entire battery cell is divided into a plurality of battery cell unit chambers by a sealant inside, and the connected battery cell unit chambers are connected by an uncoated area passing through the sealant; the problem of excessive length when extending in a single direction is solved; a material with good thermal conductivity is inserted as a heat sink between the spiral battery cell units to assist the bipolar battery cell in heat dissipation, thereby alleviating the heat dissipation problem when the battery is too large; and under the premise of ensuring that the number of layers and capacity of each battery cell unit 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, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0065] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods 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 in the protection scope of the present invention.

Claims

1. A spiral horizontal bipolar battery cell structure, characterized in that: It includes a unipolar pole piece, a bipolar pole piece, a diaphragm, an aluminum-plastic film, a heat sink and a sealing area; The unipolar pole piece includes a unipolar positive pole piece and a unipolar negative pole piece; The bipolar pole piece comprises a first current collector, a first positive electrode coating region, a first negative electrode coating region, and a non-coating region reserved between the first positive electrode coating region and the first negative electrode coating region; the first positive electrode coating region is coated on both sides of one end of the first current collector, and the first negative electrode coating region is coated on both sides of the other end of the first current collector; When stacking the sheets to prepare the battery cell unit body, the bipolar pole pieces are overlapped in spiral order, the polarities of the coating areas of the two adjacent layers of pole pieces are opposite, the unipolar pole pieces are arranged at the head and tail ends of the overlap, and the diaphragm is arranged between the coating areas of the adjacent pole pieces; several layers of stacked pole pieces are bounded by the uncoated area to form a battery cell unit body; The battery cell unit body is wrapped by the aluminum-plastic film and then injected with electrolyte to form a battery cell unit; the battery cell units are spirally overlapped based on the bipolar pole pieces contained therein to form a spiral horizontal bipolar battery cell structure; the heat sink is arranged between the spirally stacked battery cell units, and a sealing area is arranged at the uncoated area of ​​the bipolar pole pieces between the battery cell units.

2. The spiral horizontal bipolar battery cell structure according to claim 1, characterized in that: The spiral overlapping in sequence specifically includes the first positive coating area of ​​a bipolar pole piece overlapping with the first negative coating area of ​​another bipolar pole piece, and the first negative coating area of ​​a bipolar pole piece overlapping with the first positive coating area of ​​another bipolar pole piece, and the spiral overlapping in sequence; when the overlapping end is the first positive coating area of ​​the bipolar pole piece, it overlaps with the monopolar negative pole piece; when the overlapping end is the first negative coating area of ​​the bipolar pole piece, it overlaps with the monopolar positive pole piece; several layers of stacked pole pieces form a battery cell unit body with the uncoated area as the boundary; wherein the bipolar pole piece, another bipolar pole piece and another bipolar pole piece are three independent bipolar pole plates with the same structure.

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

4. The spiral horizontal bipolar battery cell structure according to claim 1, characterized in that: The heat sink is made of a heat-conducting material, and the heat-conducting material is heat-conducting silica gel.

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

6. The spiral horizontal bipolar battery cell structure according to claim 1, characterized in that: The non-coating area in the battery cell unit body is bonded with a sealant, and the sealant is bonded with the aluminum-plastic film wrapping the battery cell unit body on the outside, so that the battery cell unit bodies are isolated from each other.

7. The spiral horizontal bipolar battery cell structure according to claim 1, characterized in that: The unipolar pole pieces are arranged at the overlapping head and tail ends. Specifically, the unipolar pole pieces and bipolar pole pieces at the head and tail ends of the battery cell unit overlap each other, and the bipolar pole pieces in the middle battery cell unit are arranged in an alternating manner.

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

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

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

Images