Battery cell laminated structure and battery cell

Abstract

The utility model belongs to battery technical field discloses a kind of electric core lamination structure and electric core, electric core lamination structure includes diaphragm, positive sheet and negative sheet, the diaphragm is located between the adjacent positive sheet and the negative sheet, the positive sheet and the negative sheet are repeated unit with preset quantity ratio formation, and specified interval is arranged between the adjacent positive sheet or the negative sheet of same layer. By the specified interval between the adjacent positive sheet and / or negative sheet of same layer, electrolyte infiltration channel can be formed, the electrolyte infiltration path of large-size sheet is shortened, the infiltration rate is accelerated, and the electrolyte infiltration difficulty problem is solved. At the same time, the interval can be used as an exhaust channel to help the rapid discharge of a large amount of gas during the formation process and avoid gas retention. Moreover, the interval disperses the large-size sheet into independent functional units, which evenly distributes the current in each unit during charging and discharging, suppresses local overheating, ultimately ensures the stable performance of the electric core and prolongs the service life.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cell stacking structure and a cell. Background Technology

[0002] With the rapid development of the new energy vehicle industry, users' demand for driving range continues to increase, making the energy density of power batteries a core pursuit of the industry. To improve energy density and reduce costs, integrated solutions such as CTP and CTC, as well as new cell structures such as large cylindrical 4680 batteries and SPS ultra-large soft-pack batteries are constantly emerging. Their core idea is to increase the capacity of a single cell to reduce the use of auxiliary materials and structural components.

[0003] However, the increase in cell capacity is accompanied by an increase in size, especially in length, width and thickness, which has led to a series of manufacturing and performance challenges: First, the increase in electrode area and cell thickness makes it difficult for electrolyte to wet the cells, affecting the consistency of the formation interface; second, the amount of gas generated during the formation process increases dramatically, and the gas is difficult to expel effectively; third, the uneven distribution of current density during charging and discharging exacerbates the problem of local overheating, which seriously affects the cycle life and power performance of the cells. Utility Model Content

[0004] The main purpose of this utility model is to provide a battery cell stacking structure and a battery cell, which aims to solve the technical problems that arise after the increase in battery cell capacity is accompanied by an increase in size, such as difficulty in electrolyte wetting, difficulty in venting formed gas, and local overheating during charging and discharging, which affect the performance and life of the battery cell.

[0005] To achieve the above-mentioned utility model objectives, this utility model proposes a battery cell stacked structure, including a separator, a positive electrode sheet, and a negative electrode sheet. The separator is located between adjacent positive electrode sheets and negative electrode sheets. The positive electrode sheets and negative electrode sheets are arranged in a predetermined quantity ratio to form repeating units, and a specified interval is provided between adjacent positive electrode sheets or negative electrode sheets in the same layer.

[0006] Furthermore, there are two positive electrode sheets and one negative electrode sheet, and the specified interval is located between two adjacent positive electrode sheets.

[0007] Furthermore, the positive electrode is one sheet, the negative electrode is two sheets, and the specified interval is located between two adjacent negative electrode sheets.

[0008] Furthermore, there are two positive electrode sheets and multiple negative electrode sheets. The specified interval includes a first interval and a second interval arranged in a staggered manner. The first interval is located between two adjacent positive electrode sheets, and the second interval is located between adjacent negative electrode sheets.

[0009] Furthermore, there are multiple positive electrode sheets and multiple negative electrode sheets. The specified interval includes a third interval and a fourth interval arranged in a staggered manner. The third interval is located between adjacent positive electrode sheets, and the fourth interval is located between adjacent negative electrode sheets.

[0010] Furthermore, the positive electrode includes multiple first positive electrode sheets and multiple second positive electrode sheets, the negative electrode includes two first negative electrode sheets and multiple second negative electrode sheets, the separator includes a first separator, a second separator and a third separator, and the designated interval includes a fifth interval, a sixth interval, a seventh interval and an eighth interval; The first positive electrode, the first separator, the first negative electrode, the second separator, the second positive electrode, the third separator, and the second negative electrode are stacked sequentially from bottom to top. The fifth interval is located between adjacent first positive electrodes, the sixth interval is located between adjacent first negative electrodes, the seventh interval is located between adjacent second positive electrodes, and the eighth interval is located between adjacent second negative electrodes.

[0011] Furthermore, the specified interval is d, where 0mm < d ≤ 10mm.

[0012] Furthermore, the positive electrode has a length ≥ 500 mm and a width ≥ 200 mm, and the negative electrode has a length ≥ 500 mm and a width ≥ 200 mm.

[0013] Furthermore, the ratio of the reversible capacity of the negative electrode to the reversible capacity of the positive electrode is ≥1.15.

[0014] Furthermore, the positive electrode sheet includes a positive electrode coating area and a positive electrode empty foil area connected to the positive electrode coating area, and the negative electrode sheet includes a negative electrode coating area and a negative electrode empty foil area connected to the negative electrode coating area. The positive electrode empty foil area and the negative electrode empty foil area are disposed opposite to each other, and the negative electrode coating area covers the positive electrode coating area.

[0015] Furthermore, the positive electrode sheet also includes a ceramic region coated in a designated area of ​​the positive electrode empty foil region.

[0016] This utility model also provides a battery cell, including the battery cell stacking structure described in any of the above embodiments.

[0017] Beneficial effects: This utility model discloses a battery cell stacked structure, including a separator, a positive electrode, and a negative electrode. The separator is located between adjacent positive and negative electrode sheets. The positive and negative electrode sheets are arranged in a predetermined ratio to form repeating units, and a specified interval is provided between adjacent positive or negative electrode sheets in the same layer. By setting a specified interval between adjacent positive and / or negative electrode sheets in the same layer, an electrolyte wetting channel can be formed, shortening the electrolyte wetting path of large-size electrode sheets, accelerating the wetting rate, and solving the problem of difficult electrolyte wetting. At the same time, the interval can also serve as a venting channel, helping to quickly expel a large amount of gas during the formation process and avoiding gas retention. Furthermore, the interval discretizes the large-size electrode sheets into independent functional units, so that the current is evenly distributed in each unit during charging and discharging, suppressing local overheating, and ultimately ensuring stable battery cell performance, extending service life, and adapting to the performance and lifespan requirements of large-size battery cells. Attached Figure Description

[0018] Figure 1 This is a top view of a battery cell stacking structure according to an embodiment of the present invention; Figure 2 This is a bottom view of a battery cell stacking structure according to an embodiment of the present invention; Figure 3 This is a side view of a battery cell stacking structure according to an embodiment of the present invention; Figure 4 This is a diagram showing the effect of welding the battery cell stacking structure according to an embodiment of the present invention; Figure 5 This is a diagram showing the effect of welding the battery cell stacked structure according to another embodiment of this utility model; Figure 6 This is a diagram showing the effect of welding the battery cell stacked structure according to another embodiment of this utility model; Figure 7 This is a diagram showing the effect of welding the cell stacked structure according to another embodiment of the present invention; Figure 8 This is a diagram showing the effect of welding the cell stacked structure according to another embodiment of the present invention; Figure 9 This is a schematic diagram of the negative electrode sheet according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the positive electrode sheet according to an embodiment of the present invention.

[0019] in: 1. Separator; 2. Positive electrode plate; 3. Negative electrode plate; 4. Specified spacing; 5. Positive electrode tab; 6. Negative electrode tab; 10. First septum; 11. Second septum; 12. Third septum; 20. First positive electrode plate; 21. Second positive electrode plate; 22. Positive electrode coating area; 23. Positive electrode empty foil area; 24. Ceramic area; 30. First negative electrode sheet; 31. Second negative electrode sheet; 32. Negative electrode coating area; 33. Negative electrode empty foil area; 40. Fifth interval; 41. Sixth interval; 42. Seventh interval; 43. Eighth interval; 44. First interval; 45. Second interval; 46. Third interval; 47. Fourth interval.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0022] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly and specifically defined.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] Reference Figures 1-8 This embodiment provides a battery cell stacked structure, including a separator 1, a positive electrode 2 and a negative electrode 3. The separator 1 is located between adjacent positive electrode 2 and negative electrode 3. The positive electrode 2 and negative electrode 3 form repeating units in a preset quantity ratio, and a specified interval 4 is provided between adjacent positive electrode 2 or negative electrode 3 in the same layer.

[0026] In the above embodiments, the cell stacked structure is applied to pouch cells, and its main components include a positive electrode 2, a negative electrode 3, a separator 1, a positive electrode tab 5, and a negative electrode tab 6. The positive electrode 2 is the carrier of the positive active material participating in the electrochemical reaction, and the negative electrode 3 is the carrier of the negative active material participating in the electrochemical reaction. Through electrochemical reactions, lithium ions are inserted and extracted, completing the storage and release of electrical energy. The ratio of the reversible capacity of the negative electrode 3 to the reversible capacity of the positive electrode 2 is ≥1.15. The separator 1 is a gel separator or a PMMA-coated separator, whose physical function is to spatially separate the positive electrode 2 and the negative electrode 3, preventing direct contact that could lead to a short circuit, while allowing lithium ions to pass freely during charging and discharging, ensuring the normal progress of the electrochemical reaction. The positive electrode tab 5 and the negative electrode tab 6 are conductive components that connect the external circuit of the battery cell to the internal positive and negative electrode plates 3, respectively. They are usually made of metal, with the positive electrode tab 5 typically being made of aluminum and the negative electrode tab 6 being made of copper. They are used to collect current and lead it to the outside of the battery cell.

[0027] In this stacked structure, a separator 1 is disposed between each pair of adjacent positive electrode plates 2 and negative electrode plates 3, forming a basic unit of "positive electrode plate 2-separator 1-negative electrode plate 3" or "negative electrode plate 3-separator 1-positive electrode plate 2". Multiple such basic units are stacked sequentially according to a preset quantity ratio to form repeatable structural units. Multiple repeating units are continuously stacked to form a complete cell body. A specified physical interval, d, is provided between adjacent positive electrode plates 2 or adjacent negative electrode plates 3 in the same layer, and the interval satisfies 0mm < d ≤ 10mm. This interval is used to construct channels inside the electrode layer. If the interval is too large, it will lead to an increase in the difference in expansion rate and elongation between the non-lithium-intercalated region corresponding to the negative electrode plate 3 and the lithium-intercalated region corresponding to the positive electrode.

[0028] All positive electrode plates 2 are uniformly connected to the positive electrode tab 5 via conductive connections, and all negative electrode plates 3 are uniformly connected to the negative electrode tab 6, ensuring consistent current distribution during charging and discharging. The entire stacked structure is formed using a stacking process and undergoes hot and cold pressing processes to enhance structural compactness and mechanical stability. This structure is suitable for large-size battery cell designs where the length of the positive electrode plate 2 and the negative electrode plate 3 is not less than 500mm and the width is not less than 200mm. Especially in the packaging process of soft-pack batteries, when the depth of the perforation in the aluminum-plastic film is limited and it is difficult to increase the battery cell thickness, the battery cell capacity and energy density can be improved by two-dimensional expansion in the length and width directions, while simplifying the packaging process and reducing manufacturing costs.

[0029] Therefore, by setting a designated interval 4 between adjacent positive electrode plates 2 and / or negative electrode plates 3 in the same layer, an electrolyte wetting channel can be formed, shortening the electrolyte wetting path of large-size electrode plates, accelerating the wetting rate, and solving the problem of difficult electrolyte wetting. At the same time, the interval can also serve as an exhaust channel, helping to quickly expel a large amount of gas during the formation process and avoiding gas retention. Furthermore, the interval discretizes the large-size electrode plates into independent functional units, so that the current is evenly distributed in each unit during charging and discharging, suppressing local overheating, and ultimately ensuring stable cell performance, extending service life, and adapting to the performance and lifespan requirements of large-size cells.

[0030] Reference Figures 1-4 In one embodiment, there are two positive electrode plates 2 and one negative electrode plate 3, and the designated interval 4 is located between two adjacent positive electrode plates 2.

[0031] In the above embodiment, there are two positive electrode sheets 2 and one negative electrode sheet 3, forming a "double positive and one negative" stacked unit. In this structure, the two positive electrode sheets 2 are located on the same layer and are adjacent to each other. The specified interval 4 is located between the two adjacent positive electrode sheets 2. This stacked structure adopts a repeating unit stacking method to form a periodic repeating structure of type ABAB... By splitting the original wide positive electrode sheet 2 with a width greater than 200mm into two narrower positive electrode sheets 2 and leaving a small gap d between them, this gap forms a transverse channel inside the cell. During the electrolyte injection process, the electrolyte can directly penetrate into the electrode sheet from this gap d. During the formation stage, the gas generated by the electrochemical reaction can use this gap d as a flow channel. After the stacking is completed, the two positive electrode sheets 2 on the same layer are connected to the same positive electrode tab 5 by welding to ensure that the current distribution is consistent during charging and discharging, avoiding performance degradation caused by potential differences.

[0032] In another embodiment, such as Figure 5 Each stacked cell contains one positive electrode 2 and two negative electrode 3, with the two negative electrode 3 located on the same layer and arranged adjacently. The designated interval 4 is located between the two adjacent negative electrode 3. This design discretizes the originally continuous wide negative electrode 3 into two narrower negative electrode 3, forming a channel inside the cell through the gap d. The separator 1 is located between the positive electrode 2 and the adjacent negative electrode 3, ensuring that the positive and negative electrode 3 are effectively isolated in space. Multiple "one positive and two negative" units are stacked in an ABAB... pattern to form a periodic structure.

[0033] In another embodiment, such as Figure 6 Each stacked unit contains two positive electrode plates 2 and multiple negative electrode plates 3 (usually three), forming a "double positive and multiple negative" repeating unit. The two positive electrode plates 2 are located in the same layer and arranged adjacently, with a first interval 44 between them; the multiple negative electrode plates 3 are also located in the same layer, with a second interval 45 between two adjacent negative electrode plates 3. The first interval 44 and the second interval 45 are staggered in the stacking direction, that is, they are not in the same vertical position, to avoid forming a through hole through the cell, thereby maintaining structural stability while ensuring the channel function. The separator 1 is respectively set between each pair of adjacent positive electrode plates 2 and negative electrode plates 3 to ensure the normal progress of electrochemical reaction. Multiple such units are periodically stacked in an ABAB... pattern to form a complete cell body.

[0034] In another embodiment, such as Figure 7Each stacked unit contains multiple positive electrode plates 2 and multiple negative electrode plates 3, preferably three positive electrode plates 2 and three negative electrode plates 3, forming a repeating "multiple positive and multiple negative" unit. A third interval 46 is provided between two adjacent positive electrode plates 2 in the same layer, and a fourth interval 47 is provided between two adjacent negative electrode plates 3 in the same layer. The third interval 46 and the fourth interval 47 are staggered in the stacking direction, meaning they do not overlap in the vertical direction, avoiding the formation of continuous through-holes penetrating the cell. This ensures the mechanical stability of the overall structure while retaining functional channels. A separator 1 is sequentially disposed between each pair of adjacent positive electrode plates 2 and negative electrode plates 3. Multiple "multiple positive and multiple negative" units are stacked in an ABAB… type periodic repeating pattern to form the complete main structure of the cell. Therefore, by using a fixed number of positive and negative electrode plates 3 in the same layer to form an ABAB… type repeating small unit stacked structure, the wide-range electrode plate discretization design makes the current distribution more uniform, suppresses local overheating, and improves the cell's cycle life and safety.

[0035] Reference Figure 8 In another embodiment, the positive electrode 2 includes multiple first positive electrode 20 and multiple second positive electrode 21, the negative electrode 3 includes two first negative electrode 30 and multiple second negative electrode 31, the separator 1 includes a first separator 10, a second separator 11 and a third separator 12, and the designated interval 4 includes a fifth interval 40, a sixth interval 41, a seventh interval 42 and an eighth interval 43; The first positive electrode 20, the first separator 10, the first negative electrode 30, the second separator 11, the second positive electrode 21, the third separator 12, and the second negative electrode 31 are stacked sequentially from bottom to top. The fifth interval 40 is located between adjacent first positive electrode 20s, the sixth interval 41 is located between adjacent first negative electrode 30s, the seventh interval 42 is located between adjacent second positive electrode 21s, and the eighth interval 43 is located between adjacent second negative electrode 31s.

[0036] In the above embodiment, the positive electrode 2 includes multiple first positive electrode sheets 20 and multiple second positive electrode sheets 21, the negative electrode 3 includes two first negative electrode sheets 30 and multiple second negative electrode sheets 31, the separator 1 includes a first separator 10, a second separator 11 and a third separator 12, and the designated interval 4 includes a fifth interval 40, a sixth interval 41, a seventh interval 42 and an eighth interval 43 arranged in a staggered manner. The first positive electrode sheets 20 and the second positive electrode sheets 21 are both positive electrode carriers that participate in the lithium-ion intercalation and deintercalation reaction in the battery cell. They are located in different functional layers of the stacked structure and jointly undertake the task of energy release and storage. The first negative electrode sheets 30 and the second negative electrode sheets 31 are negative electrode carriers that receive and intercalate lithium ions. They cooperate with the positive electrode sheets 2 to complete the electrochemical reaction. The first separator 10, the second separator 11 and the third separator 12 are respectively disposed between adjacent positive electrode sheets 2 and negative electrode sheets 3.

[0037] In this structure, the components are stacked sequentially from bottom to top in a specific order: first positive electrode 20, first separator 10, first negative electrode 30, second separator 11, second positive electrode 21, third separator 12, and second negative electrode 31, forming a complete multi-layer stacked unit. This unit, as a repeating structure, can be periodically stacked to form an ABCDABCD type stacked sequence. A fifth interval 40 is provided between adjacent first positive electrode 20s in the same layer, a sixth interval 41 is provided between two adjacent first negative electrode 30s, and a seventh interval is provided between adjacent second positive electrode 21s. An eighth interval 43 is provided between adjacent second negative electrode sheets 31, and all intervals d satisfy 0mm < d ≤ 10mm to form channels for electrolyte wetting and gas discharge. By adjusting the number of first positive electrode sheets 20, second positive electrode sheets 21, first negative electrode sheets 30 and second negative electrode sheets 31, different capacity requirements can be flexibly adapted. During the welding process, the foil tabs on the positive electrode sheets 2 or negative electrode sheets 3 of adjacent layers can be staggered to form continuous contact with the positive electrode tabs 5 or negative electrode tabs 6, thereby increasing the welding area and current carrying capacity and improving connection reliability.

[0038] Reference Figures 1-4 , Figure 9-10 In one embodiment, the positive electrode 2 includes a positive electrode coating area 22 and a positive electrode empty foil area 23 connected to the positive electrode coating area 22, and the negative electrode 3 includes a negative electrode coating area 32 and a negative electrode empty foil area 33 connected to the negative electrode coating area 32. The positive electrode empty foil area 23 and the negative electrode empty foil area 33 are disposed opposite to each other, and the negative electrode coating area 32 covers the positive electrode coating area 22.

[0039] In the above embodiments, the positive electrode 2 consists of a positive electrode coated area 22 and a positive electrode empty foil area 23. The positive electrode coated area 22 is the area coated with positive electrode active material, which undertakes the electrochemical reaction function of lithium ion extraction. The positive electrode empty foil area 23 is a metal current collector area without active material coating, mainly serving as a channel for current collection and conduction. The negative electrode 3 consists of a negative electrode coated area 32 and a negative electrode empty foil area 33. The negative electrode coated area 32 is coated with negative electrode active material, which is responsible for receiving and embedding lithium ions. The negative electrode empty foil area 33 is a metal current collector in the uncoated area, used to connect to external circuits and conduct current.

[0040] In the stacked structure, the positive electrode empty foil area 23 and the negative electrode empty foil area 33 are spatially opposite each other, forming an electrical connection docking area. This ensures that the current can be effectively collected and led out through the tabs during the charging and discharging process of the battery cell. At the same time, the size of the negative electrode coating area 32 is designed to be larger than that of the positive electrode coating area 22 to achieve the coverage of the positive electrode by the negative electrode. This structure ensures that lithium ions extracted from any position (including the edge) of the positive electrode sheet 2 are received by sufficient negative electrode sheets 3 on the opposite side, reducing the lithium plating problem caused by lithium ions in the edge area of ​​the electrode sheet and improving the safety of the battery cell. The main function of the empty foil area is to connect the external tabs and conduct current. Under the condition of meeting the overcurrent requirement, the total size of the positive electrode empty foil area / negative electrode empty foil area can be large or small, but the empty foil areas can be staggered to increase the soldering area and thus improve the overcurrent capacity. In this embodiment, when multiple positive electrode sheets 2 are arranged adjacently in the same layer, the total size of their positive electrode empty foil area 23 is smaller than the total size of the negative electrode empty foil area 33 of multiple negative electrode sheets 3 in the same layer, ensuring that the negative electrode empty foil area 33 can completely cover the corresponding area of ​​the positive electrode empty foil area 23, and maintaining good electrical contact and insulation boundary.

[0041] In addition, the positive electrode 2 also includes a ceramic region 24, which is coated on a designated area of ​​the positive electrode empty foil region 23. The ceramic region 24 has a width of 5 mm to 8 mm and a length consistent with the entire positive electrode empty foil region 23. The ceramic region 24 has excellent insulation and high temperature resistance, which can further enhance the insulation capability of the positive electrode empty foil region 23, prevent micro short circuits caused by burrs or defects in the separator 1, and improve the thermal stability and safety of the battery cell.

[0042] This utility model also provides a battery cell, including the battery cell stacking structure described in any of the above embodiments, which effectively ensures stable battery cell performance, extends service life, and adapts to the performance and lifespan requirements of large-size battery cells.

[0043] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A cell stacked structure, characterized in that, It includes a separator, a positive electrode, and a negative electrode. The separator is located between adjacent positive and negative electrode sheets. The positive and negative electrode sheets are arranged in a predetermined ratio to form repeating units, and a specified interval is provided between adjacent positive or negative electrode sheets in the same layer.

2. The cell stacked structure according to claim 1, characterized in that, The positive electrode consists of two sheets, the negative electrode consists of one sheet, and the specified interval is located between two adjacent positive electrode sheets.

3. The cell stacking structure according to claim 1, characterized in that, The positive electrode is one sheet, and the negative electrode is two sheets, with the specified interval located between two adjacent negative electrode sheets.

4. The cell stacking structure according to claim 1, characterized in that, The positive electrode consists of two sheets, and the negative electrode consists of multiple sheets. The specified interval includes a first interval and a second interval arranged in a staggered manner. The first interval is located between two adjacent positive electrode sheets, and the second interval is located between adjacent negative electrode sheets.

5. The cell stacking structure according to claim 1, characterized in that, The positive electrode sheet is multiple sheets, the negative electrode sheet is multiple sheets, and the specified interval includes a third interval and a fourth interval arranged in a staggered manner. The third interval is located between adjacent positive electrode sheets, and the fourth interval is located between adjacent negative electrode sheets.

6. The cell stacking structure according to claim 1, characterized in that, The positive electrode includes multiple first positive electrode sheets and multiple second positive electrode sheets, the negative electrode includes two first negative electrode sheets and multiple second negative electrode sheets, the separator includes a first separator, a second separator and a third separator, and the designated interval includes a fifth interval, a sixth interval, a seventh interval and an eighth interval; The first positive electrode, the first separator, the first negative electrode, the second separator, the second positive electrode, the third separator, and the second negative electrode are stacked sequentially from bottom to top. The fifth interval is located between adjacent first positive electrodes, the sixth interval is located between adjacent first negative electrodes, the seventh interval is located between adjacent second positive electrodes, and the eighth interval is located between adjacent second negative electrodes.

7. The cell stacking structure according to claim 1, characterized in that, The specified interval is d, where 0mm < d ≤ 10mm.

8. The cell stacking structure according to claim 1, characterized in that, The positive electrode has a length ≥ 500 mm and a width ≥ 200 mm, and the negative electrode has a length ≥ 500 mm and a width ≥ 200 mm.

9. The cell stacked structure according to claim 1, characterized in that, The ratio of the reversible capacity of the negative electrode to the reversible capacity of the positive electrode is ≥1.

15.

10. The cell stacking structure according to claim 1, characterized in that, The positive electrode sheet includes a positive electrode coating area and a positive electrode empty foil area connected to the positive electrode coating area. The negative electrode sheet includes a negative electrode coating area and a negative electrode empty foil area connected to the negative electrode coating area. The positive electrode empty foil area is disposed opposite to the negative electrode empty foil area, and the negative electrode coating area covers the positive electrode coating area.

11. The cell stacking structure according to claim 10, characterized in that, The positive electrode also includes a ceramic region, which is coated in a designated area of ​​the positive electrode empty foil region.

12. A battery cell, characterized in that, Includes the cell stacked structure as described in any one of claims 1-11.

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