Battery cells and battery packs

Abstract

This utility model relates to a battery cell, comprising multiple sequentially arranged energy storage basic units. Each energy storage basic unit includes a negative conductive current collector layer, a negative electrode layer, a separator, a positive electrode layer, and a positive conductive current collector layer. These energy storage basic units constitute multiple energy storage modules connected in series. Each energy storage module includes one or at least two energy storage basic units connected in parallel. In this utility model, for the battery cell, each energy storage module includes one or at least two parallel energy storage basic units. Since the energy storage modules are connected in series to form the battery cell, if any energy storage basic unit experiences a short circuit, because the energy storage modules are connected in series to form the battery cell, there will be no large current flowing through the short-circuited energy storage basic unit, preventing rapid heating of the energy storage basic unit as in existing technologies.

Description

Technical Field

[0001] This utility model relates to the field of energy storage batteries, and in particular to a battery cell and battery pack. Background Technology

[0002] The existing battery pack includes a battery pack housing, and multiple battery cells connected in series are disposed inside the battery pack housing. The internal structure of the battery cells is as follows: Figures 1-2 As shown, each battery cell includes a battery cell housing, and an electrolyte and multiple energy storage basic units 9 are disposed inside the battery cell housing. Each energy storage basic unit 9 includes a negative electrode conductive current collector 1, a negative electrode layer 2, a separator 3, a positive electrode layer 4, and a positive electrode conductive current collector 5 arranged in sequence. The energy storage basic units in the battery cell housing are connected in parallel, that is, the positive electrode conductive current collectors of each energy storage basic unit are electrically connected through a positive electrode conductor 7, and the negative electrode conductive current collectors of each energy storage basic unit are electrically connected through a negative electrode conductor 6.

[0003] The purpose of connecting the basic energy storage units in parallel is to increase capacity, while the purpose of connecting the cells in series is to increase voltage.

[0004] The existing battery packs have the following problems in use: In actual use, overcharging, over-discharging, high temperature, physical impact, etc. can cause hot spots to be generated in the basic energy storage units. In the existing technology, since the basic energy storage units are connected in parallel, if a hot spot is generated in any basic energy storage unit, the internal resistance between the negative and positive conductive current collectors of that basic energy storage unit will decrease or short-circuit. Electrons from other basic energy storage units will flow into that basic energy storage unit. In other words, the current flowing through the hot spot will increase, the temperature of the basic energy storage unit will rise rapidly, and the hot spot will quickly grow into combustion or deflagration.

[0005] Taking a battery cell containing 127 parallel-connected stacked cells as an example, it supplies 126 basic energy storage units. When a short circuit occurs in a basic energy storage unit, the current flowing through that basic energy storage unit will be very large, 126 times the current in the series state. Therefore, when a short circuit occurs in a basic energy storage unit, this type of capacity-enhancing battery cell is prone to heat accumulation and rapid combustion. Utility Model Content

[0006] The purpose of this utility model is to provide a battery cell that solves the technical problem in the prior art where the energy storage basic units of the battery cell are connected in parallel, resulting in a large current and easy heat generation and combustion when a short circuit occurs in a single energy storage basic unit; the purpose of this utility model is also to provide a battery pack using the battery cell.

[0007] To solve the above-mentioned technical problems, the technical solution of a battery cell in this utility model is as follows:

[0008] A battery cell includes multiple energy storage basic units arranged in sequence. Each energy storage basic unit includes a negative electrode conductive current collector layer, a negative electrode layer, a separator, a positive electrode layer, and a positive electrode conductive current collector layer. Each energy storage basic unit constitutes multiple energy storage modules arranged in series. Each energy storage module includes one or at least two energy storage basic units arranged in parallel.

[0009] Furthermore, each energy storage module includes two energy storage basic units connected in parallel.

[0010] Furthermore, the arrangement sequence of the two energy storage units in the same energy storage module is as follows: first positive electrode conductive current collector layer, first positive electrode layer, first separator, first negative electrode layer, first negative electrode conductive current collector layer, second negative electrode layer, second separator, second positive electrode layer, and second positive electrode conductive current collector layer. The first positive electrode conductive current collector layer and the second positive electrode conductive current collector layer of the two energy storage units in the same energy storage module are connected by a first conductor. The first negative electrode conductive current collector layer and the second negative electrode conductive current collector layer in the same energy storage module are integrally formed. In two adjacent energy storage modules, the first negative electrode conductive current collector layer of one energy storage module is connected to the second positive electrode conductive current collector layer of the other energy storage module by a second conductor. In two adjacent energy storage modules, an inter-electrode insulating sheet is provided between the second positive electrode conductive current collector layer and the first positive electrode conductive current collector layer.

[0011] Furthermore, the arrangement sequence of two adjacent energy storage basic units is: first negative electrode conductive current collector layer, first negative electrode layer, first separator, first positive electrode layer, first positive electrode conductive current collector layer, second negative electrode conductive current collector layer, second negative electrode layer, second separator, second positive electrode layer and second positive electrode conductive current collector layer. In two adjacent energy storage modules, the first positive electrode conductive current collector layer and the second negative electrode conductive current collector layer are combined on two sides of the substrate to form a composite current collector layer.

[0012] Furthermore, the arrangement sequence of two adjacent energy storage basic units is as follows: first negative electrode conductive current collector layer, first negative electrode layer, first separator, first positive electrode layer, first positive electrode conductive current collector layer, second negative electrode conductive current collector layer, second negative electrode layer, second separator, second positive electrode layer, and second positive electrode conductive current collector layer. In two adjacent energy storage basic units, the first positive electrode conductive current collector layer and the second negative electrode conductive current collector layer are integrally formed.

[0013] Furthermore, the membrane is sealed to the first positive electrode conductive current collector layer around its perimeter, and the first positive electrode layer is located in the cavity formed by the membrane and the first positive electrode conductive current collector layer.

[0014] The technical solution of the battery pack in this utility model is as follows: it includes a battery pack shell, and a plurality of cells arranged in parallel are disposed inside the battery pack shell. Each cell includes a cell shell, and a plurality of energy storage basic units arranged in sequence are disposed inside the cell shell. Each energy storage basic unit includes a negative electrode conductive current collector layer, a negative electrode layer, a separator, a positive electrode layer, and a positive electrode conductive current collector layer. Each energy storage basic unit constitutes a plurality of energy storage modules arranged in series in sequence. Each energy storage module includes one or at least two energy storage basic units arranged in parallel.

[0015] Furthermore, each energy storage module includes two energy storage basic units connected in parallel.

[0016] Furthermore, the arrangement sequence of the two energy storage units in the same energy storage module is as follows: first positive electrode conductive current collector layer, first positive electrode layer, first separator, first negative electrode layer, first negative electrode conductive current collector layer, second negative electrode layer, second separator, second positive electrode layer, and second positive electrode conductive current collector layer. The first positive electrode conductive current collector layer and the second positive electrode conductive current collector layer of the two energy storage units in the same energy storage module are connected by a first conductor. The first negative electrode conductive current collector layer and the second negative electrode conductive current collector layer in the same energy storage module are integrally formed. In two adjacent energy storage modules, the first negative electrode conductive current collector layer of one energy storage module is connected to the second positive electrode conductive current collector layer of the other energy storage module by a second conductor. In two adjacent energy storage modules, an inter-electrode insulating sheet is provided between the second positive electrode conductive current collector layer and the first positive electrode conductive current collector layer.

[0017] Furthermore, the arrangement sequence of two adjacent energy storage basic units is: first negative electrode conductive current collector layer, first negative electrode layer, first separator, first positive electrode layer, first positive electrode conductive current collector layer, second negative electrode conductive current collector layer, second negative electrode layer, second separator, second positive electrode layer and second positive electrode conductive current collector layer. In two adjacent energy storage modules, the first positive electrode conductive current collector layer and the second negative electrode conductive current collector layer are combined on two sides of the substrate to form a composite current collector layer.

[0018] Furthermore, the arrangement sequence of two adjacent energy storage basic units is as follows: first negative electrode conductive current collector layer, first negative electrode layer, first separator, first positive electrode layer, first positive electrode conductive current collector layer, second negative electrode conductive current collector layer, second negative electrode layer, second separator, second positive electrode layer, and second positive electrode conductive current collector layer. In two adjacent energy storage basic units, the first positive electrode conductive current collector layer and the second negative electrode conductive current collector layer are integrally formed.

[0019] Furthermore, the membrane is sealed to the first positive electrode conductive current collector layer around its perimeter, and the first positive electrode layer is located in the cavity formed by the membrane and the first positive electrode conductive current collector layer.

[0020] Furthermore, the battery cell is a wound-type battery cell, with positive electrode plates on both sides that connect the positive electrodes of each battery cell in parallel and negative electrode plates that connect the negative electrodes of each battery cell in parallel.

[0021] Furthermore, the battery cell is an S-shaped folded battery cell. The two sides of the battery cell are combined with positive electrode plates that connect the positive electrodes of each battery cell in parallel and negative electrode plates that connect the negative electrodes of each battery cell in parallel. In the folding direction, adjacent battery cells are connected by vertical battery cell segments.

[0022] Furthermore, the battery cell is a stacked battery cell stacked in the vertical direction, with the same polarity electrodes of two adjacent battery cells facing each other, and an inter-cell conductor is provided between two adjacent battery cells to connect the corresponding electrodes of the two adjacent battery cells in parallel.

[0023] The beneficial effects of this utility model are as follows: In this utility model, for the battery cell, each energy storage module includes one or at least two parallel energy storage basic units, and each energy storage module is connected in series to form a battery cell. If any energy storage basic unit is short-circuited, since each energy storage module is connected in series to form a battery cell, there will not be a large current passing through the short-circuited energy storage basic unit, which would cause the energy storage basic unit to heat up rapidly, as is the case in the prior art. Attached Figure Description

[0024] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding portions, wherein:

[0025] Figure 1 This is a schematic diagram of the structure of a battery cell in the existing technology;

[0026] Figure 2 yes Figure 1 Equivalent circuit diagram of Zhongdian Cell;

[0027] Figure 3 This is a schematic diagram of the structure of embodiment 1 of the battery cell in this utility model;

[0028] Figure 4 yes Figure 3 Equivalent circuit diagram of Zhongdian Cell;

[0029] Figure 5 This is a schematic diagram of the structure of embodiment 2 of the battery cell in this utility model;

[0030] Figure 6 yes Figure 5 The equivalent circuit diagram of the battery cell;

[0031] Figure 7 This is a schematic diagram of the structure of embodiment 3 of the battery cell in this utility model;

[0032] Figure 8 yes Figure 7 The equivalent circuit diagram of the battery cell;

[0033] Figure 9 This is a schematic diagram of the cooperation between the diaphragm and the corresponding positive electrode conductive current collector in Example 3;

[0034] Figure 10 This is a schematic diagram of the structure of embodiment 1 of the battery pack in this utility model;

[0035] Figure 11 This is a schematic diagram of the structure of embodiment 2 of the battery pack in this utility model;

[0036] Figure 12 This is a schematic diagram of the structure of embodiment 3 of the battery pack in this utility model;

[0037] Figure 13 This is a schematic diagram of the structure of embodiment 4 of the battery pack in this utility model;

[0038] Figure 14 yes Figure 13 Top view;

[0039] Explanation of reference numerals in the attached figures: 1. Negative electrode conductive current collector; 2. Negative electrode layer; 3. Separator; 4. Positive electrode layer; 5. Positive electrode conductive current collector; 6. Negative electrode conductor; 7. Positive electrode conductor; 8. Battery cell; 9. Basic energy storage unit; 10. First positive electrode conductive current collector layer; 11. First positive electrode layer; 12. First separator; 13. First negative electrode layer; 14. First negative electrode conductive current collector layer; 15. Second negative electrode conductive current collector layer; 16. Second negative electrode layer; 17. Second separator; 18. Second positive electrode layer; 19. Second positive electrode conductive current collector layer; 20. Inter-electrode insulating sheet; 21. Energy storage module; 22. First conductor; 23. Second conductor; 24. Positive electrode plate; 25. Negative electrode plate; 26. Vertical side battery cell segment; 27. Inter-negative electrode conductor; 28. Inter-positive electrode conductor. Detailed Implementation

[0040] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. The accompanying drawings show preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0041] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0042] Example 1 of the battery cell in this utility model is as follows: Figures 3-4 As shown: The battery cell in this embodiment is a lithium-ion battery cell, including a casing, within which the battery cell is disposed. The battery cell includes multiple sequentially arranged energy storage basic units. Each energy storage basic unit includes a negative electrode conductive current collector layer, a negative electrode layer, a separator, a positive electrode layer, and a positive electrode conductive current collector layer. Every two energy storage basic units constitute an energy storage module; that is, each energy storage basic unit constitutes multiple sequentially arranged energy storage modules, and the energy storage modules are connected in series. In this embodiment, the two energy storage basic units in each energy storage module are connected in parallel. For lithium-ion batteries, the currently more mature negative electrode conductive current collector layer material is aluminum foil, and the positive electrode conductive current collector layer material is copper foil.

[0043] Specifically, the arrangement sequence of the two energy storage units in the same energy storage module is as follows: first positive electrode conductive current collector layer 10, first positive electrode layer 11, first separator 12, first negative electrode layer 13, first negative electrode conductive current collector layer 14, second negative electrode conductive current collector layer 15, second negative electrode layer 16, second separator 17, second positive electrode layer 18, and second positive electrode conductive current collector layer 19. The first positive electrode conductive current collector layer 10 and the second positive electrode conductive current collector layer 19 of the two energy storage units in the same energy storage module are connected by a first conductor 22. The first negative electrode conductive current collector layer 14 and the second negative electrode conductive current collector layer 15 in the same energy storage module are integrally formed. In two adjacent energy storage modules, the first negative electrode conductive current collector layer 14 of one energy storage module is connected to the second positive electrode conductive current collector layer 19 of the other energy storage module by a second conductor 22. In two adjacent energy storage modules, an inter-electrode insulating sheet 20 is provided between the second positive electrode conductive current collector layer and the first positive electrode conductive current collector layer. Finally, the equivalent circuit of the battery cell is as follows. Figure 4 As shown, the energy storage modules 21 in the same cell 8 are connected in series, and the two energy storage basic units 9 in the same energy storage module are connected in parallel.

[0044] To prevent liquid leakage, the perimeter of the diaphragm is sealed to the corresponding positive conductive current collector layer, with the positive electrode layer located within the cavity formed by the diaphragm and the positive conductive current collector layer. Specifically, in this embodiment, the perimeter of the first diaphragm is bonded to the first positive conductive current collector layer, and the first positive electrode layer is located within the cavity formed by the first diaphragm and the first positive conductive current collector layer. The perimeter of the second diaphragm is bonded to the second positive conductive current collector layer, and the second positive electrode layer is located within the cavity formed by the second diaphragm and the second positive conductive current collector layer.

[0045] It's easy to see that boosted battery cells require two things: 1. Insulation between the second positive conductive current collector layer and the first positive conductive current collector layer between two adjacent energy storage modules; 2. When there are different electrode layers on both sides of the current collector, traditional processes such as winding and Z-folding diaphragms cause the current collector and the different electrode layers on both sides of the current collector to be in a unified electrolyte system with selectively passing diaphragms as the boundary, which leads to electrolyte leakage. In other words, different electrode layers need an independent electrolyte system to avoid changes in the chemical composition of the electrode layers, which would affect the original purity and function of the electrode layer's chemical composition.

[0046] To address the first problem, this invention achieves this by providing an inter-electrode insulating sheet between the second positive electrode conductive current-collecting layer and the first positive electrode conductive current-collecting layer. To address the second problem, this invention achieves this by adhering the periphery of the corresponding diaphragm to the corresponding positive electrode conductive current-collecting layer and setting the corresponding positive electrode layer in the cavity formed by the diaphragm and the corresponding positive electrode conductive current-collecting layer.

[0047] Example 2 of a battery cell Figures 5-6 As shown, the difference between Embodiment 2 and Embodiment 1 is that each energy storage module includes an energy storage basic unit 9. The arrangement order of two adjacent energy storage basic units is: first negative electrode conductive current collector layer 14, first negative electrode layer 13, first diaphragm 12, first positive electrode layer 11, first positive electrode conductive current collector layer 10, second negative electrode conductive current collector layer 15, second negative electrode layer 16, second diaphragm 17, second positive electrode layer 18, and second positive electrode conductive current collector layer 19. In two adjacent energy storage modules, the first positive electrode conductive current collector layer and the second negative electrode conductive current collector layer are combined on two sides of the substrate to form a composite current collector layer. The substrate is a conductive material, thereby realizing the series connection of two adjacent energy storage basic units.

[0048] Example 3 of a battery cell Figures 7-9 As shown, the difference between Example 3 and Example 1 is that in this example, the battery cell is a sodium-ion battery cell. For sodium-ion batteries, both the negative electrode conductive current collector layer and the positive electrode conductive current collector layer can be made of aluminum.

[0049] In this embodiment, each energy storage module includes an energy storage basic unit 9. The arrangement order of two adjacent energy storage basic units is: first negative electrode conductive current collector layer 14, first negative electrode layer 13, first diaphragm 12, first positive electrode layer 11, first positive electrode conductive current collector layer 10, second negative electrode conductive current collector layer 15, second negative electrode layer 16, second diaphragm 17, second positive electrode layer 18, and second positive electrode conductive current collector layer 19. The first positive electrode conductive current collector layer and the second negative electrode conductive current collector layer are integrally formed, and the second positive electrode conductive current collector layer is integrally formed with the adjacent first negative electrode conductive current collector layer, thereby realizing the series connection of two adjacent energy storage basic units.

[0050] The first diaphragm is bonded to the periphery of the first positive electrode conductive current collector layer, and the first positive electrode layer is located in the cavity formed by the first diaphragm and the first positive electrode conductive current collector layer; the second diaphragm is bonded to the periphery of the second positive electrode conductive current collector layer, and the second positive electrode layer is located in the cavity formed by the second diaphragm and the second positive electrode conductive current collector layer.

[0051] An embodiment 1 of a battery pack is as follows Figure 10 As shown: The battery pack includes a battery pack housing, within which are arranged a positive electrode 24 and a negative electrode 25 in a wound manner. The positive and negative electrode 24 and 25 are arranged side by side, forming an installation space between them. Multiple parallel-connected battery cells 9 are arranged within this installation space. Each battery cell includes multiple sequentially arranged energy storage basic units. The specific structure of the energy storage basic units and the connection relationships between them are the same as those in the aforementioned battery cell embodiments, and will not be detailed here. In other words, in this embodiment, each battery cell does not have an independent housing; each energy storage basic unit is electrically connected to the positive and negative electrode and is housed within the same battery pack housing.

[0052] The positive terminal of each cell is electrically connected to the positive terminal plate, and the negative terminal of each cell is electrically connected to the negative terminal plate, thereby realizing the parallel connection of the cells.

[0053] An embodiment 2 of a battery pack is as follows Figure 11 As shown, Embodiment 2 of the battery pack differs from Embodiment 1 in that the battery cell is an S-shaped folded cell. Both sides of the cell 9 are composite positive electrode plates 24 for connecting the positive electrodes of each cell in parallel and negative electrode plates 25 for connecting the negative electrodes of each cell in parallel. In the folding direction, adjacent layers of cells are connected by vertical cell segments 26. In other words, in this invention, the positive and negative electrode plates are folded in an S-shape, forming an S-shaped space between them. Each cell is also arranged in an S-shape, and the length of the vertical cell segment is consistent with the folding direction of the electrode plates, ensuring sufficient utilization and allowing for the installation of more cells.

[0054] The positive terminal of each cell is electrically connected to the positive terminal plate, and the negative terminal of each cell is electrically connected to the negative terminal plate, thereby realizing the parallel connection of the cells.

[0055] Example 3 of a battery pack Figure 12 As shown: The difference between Embodiment 3 and Embodiment 1 is that the battery pack in Embodiment 3 is...

[0056] The battery cells are stacked in a vertical direction, with the same polarity electrodes of adjacent layers of cells 8 facing each other. Inter-cell conductors are provided between adjacent layers of cells to connect corresponding electrodes in parallel. These inter-cell conductors include a positive electrode conductor 28 and a negative electrode conductor 27. The positive electrode conductor 28 enables parallel positive electrode connection between adjacent layers of cells, and the negative electrode conductor 27 enables parallel negative electrode connection between adjacent layers of cells.

[0057] Example 4 of a battery pack Figures 13-14 As shown: The difference between embodiment 4 and embodiment 3 is that the battery cells 8 in this embodiment are stacked and arranged in two stacks side by side. The positive conductor 28 connects the positive electrodes of the two stacks of battery cells in parallel; the negative conductor connects the negative electrodes of the two stacks of battery cells in parallel.

[0058] In the foregoing description of this specification, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "joined" should be interpreted broadly. For example, the term "joined" can refer to 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; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this specification, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0059] Based on the above description in this specification, those skilled in the art will also understand that terms used, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not imply that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0060] Furthermore, the terms "first" or "second," etc., used in this specification to refer to numbers or ordinal numbers are for descriptive purposes only and should not be construed as indicating, explicitly or implicitly, relative importance or specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An electrical cell comprising a plurality of energy storage building blocks arranged in series, each energy storage building block comprising a negative conductive current collector layer, a negative electrode layer, a separator, a positive electrode layer, and a positive conductive current collector layer, characterized in that: Each basic energy storage unit constitutes a plurality of energy storage modules connected in series in sequence, and each energy storage module includes one or at least two basic energy storage units connected in parallel.

2. The electric cell of claim 1, wherein: Each energy storage module includes two energy storage basic units connected in parallel.

3. The battery cell according to claim 2, characterized in that: The arrangement sequence of the two basic energy storage units in the same energy storage module is as follows: first positive electrode conductive current collector layer, first positive electrode layer, first separator, first negative electrode layer, first negative electrode conductive current collector layer, second negative electrode layer, second separator, second positive electrode layer, and second positive electrode conductive current collector layer. The first positive electrode conductive current collector layer and the second positive electrode conductive current collector layer of the two basic energy storage units in the same energy storage module are connected by a first conductor. The first negative electrode conductive current collector layer and the second negative electrode conductive current collector layer in the same energy storage module are integrally formed. In two adjacent energy storage modules, the first negative electrode conductive current collector layer of one energy storage module is connected to the second positive electrode conductive current collector layer of the other energy storage module by a second conductor. In two adjacent energy storage modules, an inter-electrode insulating sheet is provided between the second positive electrode conductive current collector layer and the first positive electrode conductive current collector layer.

4. The electric cell of claim 1, wherein: The arrangement sequence of two adjacent energy storage basic units is: first negative electrode conductive current collector layer, first negative electrode layer, first separator, first positive electrode layer, first positive electrode conductive current collector layer, second negative electrode conductive current collector layer, second negative electrode layer, second separator, second positive electrode layer and second positive electrode conductive current collector layer. In two adjacent energy storage modules, the first positive electrode conductive current collector layer and the second negative electrode conductive current collector layer are combined on two sides of the substrate to form a composite current collector layer.

5. The electric cell of claim 1, wherein: The arrangement sequence of two adjacent energy storage basic units is as follows: first negative electrode conductive current collector layer, first negative electrode layer, first separator, first positive electrode layer, first positive electrode conductive current collector layer, second negative electrode conductive current collector layer, second negative electrode layer, second separator, second positive electrode layer and second positive electrode conductive current collector layer. In the two adjacent energy storage basic units, the first positive electrode conductive current collector layer and the second negative electrode conductive current collector layer are integrally formed.

6. The battery cell of any one of claims 1-5, wherein: The membrane is sealed to the corresponding positive electrode conductive current collector layer around its perimeter, and the positive electrode layer is located in the cavity formed by the membrane and the positive electrode conductive current collector layer.

7. A battery pack using the battery cell according to any one of claims 1 to 6, characterized by: It includes a battery pack housing, and multiple battery cells arranged in parallel are disposed inside the battery pack housing.

8. The battery pack of claim 7, wherein: The battery cell is a wound type, with positive electrode plates on both sides that connect the positive electrodes of each cell in parallel and negative electrode plates that connect the negative electrodes of each cell in parallel.

9. The battery pack of claim 7, wherein: The battery cell is an S-shaped folded battery cell. On both sides of the battery cell, there are positive electrode plates that connect the positive electrodes of each battery cell in parallel and negative electrode plates that connect the negative electrodes of each battery cell in parallel. In the folding direction, adjacent battery cells are connected by vertical battery cell segments.

10. The battery pack of claim 7, wherein: The battery cell is a stacked type of battery cell stacked in the vertical direction. The same electrodes of two adjacent battery cells are opposite each other, and an inter-cell conductor is provided between two adjacent battery cells to connect the corresponding electrodes of the two adjacent battery cells in parallel.

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