WO2023137799A1

WO2023137799A1 - Battery cell arrangement structure of battery pack, and arrangement method thereof

Info

Publication number: WO2023137799A1
Application number: PCT/CN2022/075362
Authority: WO
Inventors: 石正平; 陈勇; 林冲; 王文荣
Original assignee: 福建时代星云科技有限公司
Priority date: 2022-01-24
Filing date: 2022-02-07
Publication date: 2023-07-27
Also published as: CN114597597B; CN114597597A

Abstract

The present invention provides a battery cell arrangement structure of a battery pack, comprising a plurality of battery cells, a plurality of battery cell modules and a battery pack module. Each battery cell module is formed by connecting two battery cells in parallel; the battery pack module is formed by arranging the plurality of battery cell modules in three rows, i.e., an upper row, a middle row and a lower row, wherein the three rows are sequentially fitted together; electrical connectors are provided on the upper side or the lower side of the battery pack module, and the electrical connectors sequentially connect, from one corner of any row in the upper row or the lower row of the battery pack module, poles of every two adjacent battery cell modules in series in a wiring mode in the shape of a reversed tilde, and the polarities of the poles of the two battery cell modules connected in series are opposite. The present invention further provides a battery cell arrangement method of a battery pack. According to the present invention, the poles of every two adjacent battery cell modules are sequentially connected in series by means of the electrical connectors in the wiring mode in the shape of a reversed tilde from a certain corner of a certain row of the battery pack module, rather than a conventional S-shaped wiring mode, so that a creepage distance of the electrical connectors is reduced, and a voltage difference between adjacent battery cells in the battery pack is effectively reduced.

Description

Cell arrangement structure and arrangement method of battery pack

technical field

The invention relates to the technical field of battery packs of two-wheeled electric vehicles, in particular to a cell arrangement structure of the battery pack and an arrangement method thereof.

Background technique

With the development of battery technology, two-wheeled electric vehicles have been widely used in the field of travel. Due to the continuous increase in the cruising range of two-wheeled electric vehicles, lithium iron phosphate batteries are gradually replacing traditional lead-acid batteries due to their high energy density.

Most of the lithium iron phosphate cells used in the battery packs of two-wheeled electric vehicles are cylindrical cells. For safety reasons, the cells in the existing battery packs are usually connected in series and then in parallel. Therefore, the arrangement of the cells directly determines the pressure difference between the cells in the battery pack.

The existing battery cells are arranged in an S shape, the voltage difference between the cells is the total voltage of the entire battery pack, the creepage distance required by adjacent electrical connectors is relatively large, and the structure for preventing creepage in the battery pack is complicated.

technical problem

The technical problem to be solved by the present invention is to provide a cell arrangement structure and an arrangement method of the battery pack, optimize the cell arrangement, reduce the pressure difference between adjacent cells, and reduce the creepage distance required by adjacent electrical connectors.

technical solution

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A cell arrangement structure of a battery pack, comprising a plurality of cells, a plurality of cell modules and a battery pack module;

Each group of cell modules is composed of two cells connected in parallel;

The battery pack module is composed of multiple sets of battery core modules in the upper, middle and lower rows, and each row is sequentially fitted;

The upper side or the lower side of the battery pack module is provided with an electrical connector, and the electrical connector connects the poles of each adjacent two groups of battery modules in series in a ∽-shaped wiring manner from a corner of any one of the upper row or the lower row of the battery pack module, and the polarities of the poles of the two groups of battery modules connected in series are opposite.

In order to solve the above technical problems, another technical solution adopted by the present invention is:

A cell arrangement method for a battery pack, comprising the steps of:

S1. Connect every two cells in parallel to form a group of cell modules to obtain multiple groups of cell modules;

S2. The distribution of the upper, middle and lower rows of multiple sets of battery modules are sequentially fitted to form a battery pack module;

S3. An electrical connector is provided on the upper side or lower side of the battery pack module, and the electrical connector is serially connected to the poles of each adjacent two groups of battery modules in a ∽-shaped wiring manner from a corner of any row in the upper or lower row of the battery pack module, and the polarities of the poles of the two groups of battery modules connected in series are opposite.

Beneficial effect

The beneficial effect of the present invention is that: the present invention provides a cell arrangement structure and arranging method of the battery pack, by replacing the traditional structure of connecting the cell modules in the battery pack in series in an S-shaped wiring manner, to a structure in which the poles of each adjacent two groups of cell modules are connected in series through electrical connectors through a corner on the upper or lower side of the battery pack module, which greatly optimizes the arrangement of the cells, thus reducing the creepage distance of the electrical connectors and effectively reducing the adjacent electric current in the battery pack. pressure difference between cores.

Description of drawings

FIG. 1 is a schematic top view of the cell arrangement of an existing battery pack;

FIG. 2 is a schematic top view of a battery pack module in a cell arrangement structure of a battery pack;

3 is a schematic bottom view of a battery pack module in a cell arrangement structure of a battery pack;

4 is a schematic diagram of the overall structure of a battery pack module in a cell arrangement method of a battery pack;

FIG. 5 is a flow chart of a cell arrangement method for a battery pack.

1. Cell module; 2. Battery pack module; 3. Pole; 4. Input terminal; 5. Output terminal.

Embodiments of the present invention

In order to describe the technical content, achieved goals and effects of the present invention in detail, the following descriptions will be made in conjunction with the embodiments and accompanying drawings.

Please refer to Figures 2 to 4, a cell arrangement structure of a battery pack, including multiple cells, multiple sets of cell modules and battery pack modules;

Each group of cell modules is composed of two cells connected in parallel;

From the above description, it can be seen that the beneficial effect of the present invention lies in that the traditional structure of connecting the cell modules in the battery pack in an S-shaped wiring manner is replaced by a structure in which the poles of each adjacent two groups of cell modules are connected in series through the electrical connectors through a corner of the upper or lower side of the battery pack module in a ∽-shaped wiring manner.

Further, the two parallel-connected cells in each group of cell modules are placed in the same polarity orientation.

It can be seen from the above description that each group of battery modules consists of two batteries placed in parallel with the same polarity, which improves the capacitance of a single battery module on the basis of reducing parallel wiring.

Further, the cell modules located in the upper row are in N groups and all the cells in it are placed in sequence horizontally, and the N is a positive integer greater than 1;

The cell modules in the middle row are 2N-1 groups placed obliquely at 60°, and one of the cells in each group of cell modules is embedded between two adjacent cells in the upper row;

The cell modules located in the lower row are N-1 groups and all the cells in it are placed in sequence horizontally, and each cell located in the lower row fits between two adjacent cells located in the middle row.

It can be seen from the above description that the upper, middle and lower rows of battery modules are tightly fitted together to form a battery pack module in order to ensure the strength of the overall battery pack and maximize the use of the battery pack space to increase the power of the overall battery pack module. In addition, the oblique arrangement of the battery modules in the middle row at 60° can provide the shortest routing distance for the ∽-shaped wiring of electrical connectors, thereby further reducing the creepage distance required by adjacent electrical connectors.

Further, a group of first battery modules is also provided on the first side of the battery pack module where the four batteries are in the same oblique direction;

The first cell module is in the same oblique direction as the cell module located in the middle row, and the cells near the lower row in the first cell module are adjacent to the cell modules located in the lower row, and the cells near the middle row are adjacent to the cell modules located in the middle row.

It can be seen from the above description that the number of battery modules in the lower row is one less than that in the upper row, and the number of battery modules placed obliquely in the middle row is twice the number of battery modules in the upper row and then reduced by one group. Therefore, the overall battery pack module structure formed after the upper, middle and lower rows of battery modules are sequentially fitted will have four batteries on one side in the same direction. At this time, add a group of first battery modules on this side of the same direction and make it close to the battery modules in the lower row and the middle row, so that the final overall battery pack module will appear left and right. The symmetrical and staggered compact structure not only ensures the stability of the battery pack module structure, but also makes full use of the battery pack space to further increase the power of the overall battery pack module.

Further, the input end and the output end of the battery pack module are respectively located on the upper and lower sides of the battery pack module.

It can be known from the above description that the input and output of the overall battery pack are located on the upper and lower sides of the battery pack module, so as to reduce the voltage difference interference between the input and output terminals.

Please refer to Figure 5, a cell arrangement method for a battery pack, including steps:

It can be seen from the above description that the beneficial effects of the present invention are: based on the same technical concept, combined with the above-mentioned cell arrangement structure of a battery pack, a cell arrangement method for a battery pack is provided, by replacing the traditional structure of connecting the cell modules in the battery pack in series with an S-shaped wiring method, to a structure in which the poles of each adjacent two groups of cell modules are connected in series through an electrical connector at a corner of the upper or lower side of the battery pack module through an electrical connector, which greatly optimizes the arrangement of the cells. , thereby reducing the creepage distance of electrical connectors and effectively reducing the voltage difference between adjacent cells in the battery pack.

Further, the step S1 is specifically:

Connect every two cells in parallel in the same polarity orientation to form a set of cell modules to obtain multiple sets of cell modules.

Further, the step S2 is specifically:

Place N groups of battery modules horizontally in order to form the upper row, place 2N-1 groups of battery modules in a 60° oblique manner to form the middle row, and place N-1 groups of battery modules in order to form the lower row with all batteries in them horizontally, one of the batteries in each group of battery modules in the middle row is embedded between two adjacent batteries in the upper row, and each battery in the lower row of battery modules All fit between two adjacent batteries located in the middle row, and the N is a positive integer greater than 1.

Further, the step S2 also includes:

On the first side of the battery pack module where the four cells are in the same oblique direction, a group of first cell modules is provided, and the first cell modules are in the same oblique direction as the cell modules located in the middle row, the cells near the lower row of the first cell modules are adjacent to the cell modules located in the lower row, and the cells near the middle row are adjacent to the cell modules located in the middle row.

The cell arrangement structure and method of the battery pack provided by the present invention are suitable for optimizing the arrangement of cells in the battery pack of a two-wheeled electric vehicle, so as to optimize the overall performance of the battery pack. The following description will be made in conjunction with specific examples.

Please refer to Fig. 1 to Fig. 4, embodiment one of the present invention is:

A cell arrangement structure of a battery pack, as shown in FIGS. 2 to 4 , includes a plurality of cells, a plurality of cell modules 1 and a battery pack module 2 .

Wherein, each group of cell modules 1 is composed of two cells connected in parallel. In this embodiment, every two parallel cells in each group of cell modules 1 are placed in the same polarity, that is, each group of cell modules 1 is connected in parallel by two cells placed in the same polarity, which can increase the capacitance of a single cell module 1 on the basis of reducing parallel wiring.

Among them, the battery pack module 2 is composed of multiple groups of battery pack modules 1 in three rows above, middle and down, and each row is sequentially fitted, as shown in the top view or bottom view of the battery pack module 2 in FIG. 2 or FIG. 3 ; The poles 3 of the cell module 1 have opposite polarities.

In this embodiment, take the top view of the battery pack module 2 as an example, that is, as shown in FIG. 2 , the electrical connectors only need to connect the cell modules 1 in series on the upper part (i.e., the upper side) of the battery pack module 2, and the input terminal 4 of the battery pack module 2 selects a group of cell modules 1 located in the lower left corner, that is, the leftmost group of cell modules 1 in the lower row. 2 The output terminal 5 at the bottom (i.e., the lower side) is output. In this embodiment, the negative pole is used as the input terminal 4, that is, the input terminal - in FIG. 2, and the positive pole is used as the output terminal 5, that is, the output terminal 5 in FIG.

In other equivalent embodiments, the electrical connectors can also connect the cell modules 1 in series on the lower side of the battery pack module 2, that is, it is only necessary to connect the cell modules 1 in series on one of the upper and lower sides of the battery pack module 2; at the same time, the input end 4 and the output end 5 can also be selected from the upper row or the lower row and which end (i.e., left or right) to end according to actual needs. It is only necessary to ensure that the final input end 4 and output end 5 are respectively located on the upper and lower sides of the battery pack module 2 and are also located in the battery pack. The left and right sides of the module 2 can be used; and the polarity of the input terminal 4 and the output terminal 5 can also be freely limited. It is enough to ensure that the input and output polarities of the battery pack module 2 are reversed. It is not limited that the input terminal can only be negative and the output terminal can only be positive.

As shown in Figure 1, it is a top view schematic diagram of the arrangement of cells in the existing battery pack. From Figure 1, it can be seen that every two cells are connected in parallel to form a set of cell modules 1, but the overall battery pack module 2 is composed of four rows of cell modules 1, and the cells in each row of cell modules 1 are connected successively in a horizontal direction. Therefore, the series wiring of each group of cell modules 1 (that is, the arrangement of electrical connectors) is similar to an S-shaped routing. The creepage distance is large.

At the same time, comparing the arrangement of cells in this embodiment with the existing S-shaped wiring method, that is, comparing Figure 2 and Figure 1, it can also be found that the input terminal 4 and the output terminal 5 in this embodiment are respectively located on the upper and lower sides of the battery pack module 2 and are also located on the left and right sides of the overall battery pack module 2, compared with the way in which the input terminal 4 and the output terminal 5 are located on the left side in Figure 1, the voltage difference between the input and output of the battery pack module 2 is further reduced.

That is to say, in this embodiment, the traditional structure of connecting the battery modules 1 in the battery pack in an S-shaped wiring manner is replaced with a structure in which the poles 3 of each adjacent two groups of battery modules 1 are connected in series through electrical connectors in a ∽-shaped wiring manner from a certain side of the battery pack module 2 from a certain angle, thereby reducing the creepage distance of the electrical connectors and effectively reducing the voltage difference between adjacent cells in the battery pack.

Please refer to Fig. 2 to Fig. 4, embodiment two of the present invention is:

A cell arrangement structure of a battery pack. On the basis of the first embodiment above, in this embodiment, as shown in FIG. 2 or FIG. 3 , the cell modules 1 in the upper row are six groups and all the cells in them are placed in sequence in a horizontal direction; the cell modules 1 in the middle row are eleven groups placed obliquely at 60°, which is twice that of the cell modules 1 in the upper row and the number of one group is reduced, and one of the cells in each group of cell modules 1 is embedded between two adjacent cells in the upper row; There are five groups of cell modules 1 in the lower row, which is one group less than the cell modules 1 in the upper row, and each cell in the lower row fits between two adjacent cells in the middle row.

That is to say, in this embodiment, the upper, middle and lower rows of the battery module 1 are closely fitted in turn to form the battery pack module 2, which not only ensures the strength of the overall battery pack, but also maximizes the use of the battery pack space to increase the power of the overall battery pack module. In addition, the oblique arrangement of the battery modules in the middle row at 60° can provide the shortest routing distance for the ∽-shaped wiring of electrical connectors, thereby further reducing the creepage distance required by adjacent electrical connectors.

At the same time, in this embodiment, a group of first battery modules is provided on the first side of the battery pack module 2 where the four batteries are in the same oblique direction, wherein the first battery module is in the same oblique direction as the battery modules 1 located in the middle row, the batteries near the lower row of the first battery module are adjacent to the battery modules 1 located in the lower row, and the batteries near the middle row are adjacent to the battery modules 1 located in the middle row. Specifically, in this embodiment, taking the top view of FIG. 2 as an example, since the number of battery modules 1 in the lower row is one less than that of the upper row, and the number of battery modules 1 placed obliquely in the middle row is twice the number of battery modules 1 in the upper row, then one group is reduced. Therefore, the structure of the overall battery pack module 2 formed after the upper, middle, and lower rows of battery modules 1 are sequentially fitted will have a structure of four batteries in the same oblique direction on the right side. Make it close to the cell modules 1 in the lower row and the middle row, so that the final overall battery pack module 2 presents a compact structure of left-right symmetry and staggered up and down. While ensuring the structural stability of the battery pack module 2, it also makes full use of the battery pack space and further improves the power of the overall battery pack module 2.

In addition, in this embodiment, as shown in FIG. 2 , on the upper side of the battery pack module 2 , the poles of the six groups of battery modules 1 in the upper row are opposite to each other, and the polarities of the poles of the five groups of battery modules 1 in the lower row are opposite to each other. Among the eleven groups of battery modules 1 in the middle row, except for the outermost group near the input pole -, the two polarities of the other ten groups of battery modules 1 are the same, forming the polarity arrangement of "-++--++--++" as shown in Figure 2. And the polarity of the first cell module is the same as the polarity of the cell module as the input pole -, so the polarity of the first cell module on the lower side of the battery pack module 2 is +, that is, it is used as the output stage +, so that the input terminal 4 and the output terminal 5 are respectively located on the upper and lower sides of the battery pack module 2 and are also located on the left and right sides of the overall battery pack module 2, reducing the pressure difference interference between the input terminal 4 and the output terminal 5.

At the same time, in other equivalent embodiments, the cell module 1 in the upper row is group N, the cell module 1 in the middle row is group 2N-1, and the cell module 1 in the lower row is group N-1, where N is a positive integer greater than 1. For example, if N is 2, then 2N-1 is 3, and N-1 is 1. By analogy, it can be determined according to the actual battery pack power required by the two-wheeled electric vehicle and the specifications of the cells.

The cell arrangement structure of a battery pack adopted in this embodiment, the voltage difference U between adjacent cell modules 1 is 3.2V, then the creepage distance required by the adjacent electrical connectors in the battery pack module 2 is according to the internationally prescribed formula: creepage distance d≥0.25*voltage difference between cells U+5, then the final calculated creepage distance required for adjacent electrical connectors is 5.8mm, and the traditional S-shaped connection method in Figure 1 is used, the voltage difference between cell modules 1 is 73.6V, according to The creepage distance formula finally calculates that the creepage distance required by adjacent electrical connectors is 23.4mm. Therefore, the cell arrangement structure of a battery pack in this embodiment can greatly reduce the pressure difference between adjacent cells, thereby reducing the creepage distance required by adjacent electrical connectors in the battery pack module 2.

Please refer to Fig. 5, embodiment three of the present invention is:

A cell arrangement method for a battery pack, as shown in Figure 5, includes steps:

S3. Install an electrical connector on the upper or lower side of the battery pack module, and connect the electrical connector in series from a corner of any row in the upper row or lower row of the battery pack module in a ∽-shaped wiring manner to the poles of each adjacent two sets of battery modules, and the polarities of the poles of the two sets of battery modules connected in series are opposite.

That is to say, in this embodiment, based on the same technical idea, and in conjunction with the cell arrangement structure of the battery pack in the first or second embodiment above, a cell arrangement method for the battery pack is provided. By replacing the traditional structure of connecting the cell modules in the battery pack in series in an S-shaped wiring manner, it is replaced by a structure in which the poles of each adjacent two groups of cell modules are connected in series in a ∽-shaped wiring method through an electrical connector at a corner of the upper or lower side of the battery pack module, which greatly optimizes the arrangement of the cells. In this way, the creepage distance of the electrical connector is reduced, and the voltage difference between adjacent cells in the battery pack is effectively reduced.

Wherein, step S1 is specifically:

Connect every two cells in parallel with the same polarity to form a group of cell modules to obtain multiple sets of cell modules, that is, each group of cell modules is connected in parallel by placing two cells with the same polarity, and increase the capacitance of a single cell module on the basis of reducing parallel wiring.

Wherein, step S2 is specifically:

Place N groups of battery modules horizontally in order to form the upper row, place 2N-1 groups of battery modules in a 60° oblique manner to form the middle row, and place N-1 groups of battery modules in order to form the lower row with all batteries in them horizontally, one of the batteries in each group of battery modules in the middle row is embedded between two adjacent batteries in the upper row, and each battery in the lower row of battery modules All fit between two adjacent batteries located in the middle row, and N is a positive integer greater than 1.

That is to say, the upper, middle and lower rows of the battery module are closely fitted in turn to form the battery pack module, which ensures the strength of the overall battery pack and maximizes the use of the battery pack space to increase the power of the overall battery pack module. The battery modules in the middle row are arranged obliquely at 60°, which can provide the shortest routing distance for the ∽-shaped wiring of electrical connectors, thereby further reducing the creepage distance required for adjacent electrical connectors.

Wherein, step S2 also includes:

On the first side of the battery pack module where the four cells are in the same inclination direction, a group of first cell modules is set, and the first cell modules are in the same oblique direction as the cell modules in the middle row, the cells in the first cell module that are close to the lower row are adjacent to the cell modules in the lower row, and the cells in the middle row are adjacent to the cell modules in the middle row.

Since the number of battery modules in the lower row is one less than that in the upper row, and the number of battery modules placed obliquely in the middle row is twice the number of battery modules in the upper row and then reduced by one group, the overall battery pack module structure formed after the upper, middle and lower rows of battery modules are sequentially fitted together will have four batteries in the same oblique direction on one side. At this time, add a group of first battery modules on this side of the same inclination and make the batteries near the lower row adjacent to the lower row of battery modules and the middle row of batteries in the middle row. The cell modules are adjacent to each other, so that the final overall battery pack module presents a symmetrical compact structure. While ensuring the stability of the battery pack module structure, it also makes full use of the battery pack space to further increase the power of the overall battery pack module.

In addition, the input and output terminals of the battery pack module are respectively located on the upper and lower sides of the battery pack module, and the input and output of the overall battery pack are respectively located on the upper and lower sides of the battery pack module to reduce the pressure difference interference between the input and output terminals.

To sum up, the present invention provides a cell arrangement structure and arrangement method for a battery pack. By replacing the traditional structure of connecting the cell modules in series in the battery pack in an S-shaped wiring manner, to a structure in which the poles of each adjacent two groups of cell modules are connected in series through electrical connectors from a certain side of the battery pack module in a ∽-shaped wiring manner, the creepage distance of the electrical connectors is reduced, and the voltage difference between adjacent cells in the battery pack is effectively reduced.

The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent transformations made by using the description of the present invention and the contents of the drawings, or directly or indirectly used in related technical fields, are all included in the scope of patent protection of the present invention.

Claims

A cell arrangement structure of a battery pack, characterized in that it includes a plurality of cells, a plurality of cell modules and a battery pack module;

Each group of cell modules is composed of two cells connected in parallel;

The battery pack module is composed of multiple sets of battery core modules in the upper, middle and lower rows, and each row is sequentially fitted;

The upper side or the lower side of the battery pack module is provided with an electrical connector, and the electrical connector connects the poles of each adjacent two groups of battery modules in series in a ∽-shaped wiring manner from a corner of any one of the upper row or the lower row of the battery pack module, and the polarities of the poles of the two groups of battery modules connected in series are opposite.
The cell arrangement structure of a battery pack according to claim 1, wherein the two parallel cells in each cell module are placed in the same polarity.
The cell arrangement structure of a battery pack according to claim 1, characterized in that, the cell modules located in the upper row are N groups and all the cells in it are placed in sequence horizontally, and the N is a positive integer greater than 1;

The cell modules in the middle row are 2N-1 groups placed obliquely at 60°, and one of the cells in each group of cell modules is embedded between two adjacent cells in the upper row;

The cell modules located in the lower row are N-1 groups and all the cells in it are placed in sequence horizontally, and each cell located in the lower row fits between two adjacent cells located in the middle row.
The cell arrangement structure and arrangement method of the battery pack according to claim 3, characterized in that, on the first side of the battery pack module where the four cells are in the same oblique direction, a group of first cell modules is also arranged;

The first cell module is in the same oblique direction as the cell module located in the middle row, and the cells near the lower row in the first cell module are adjacent to the cell modules located in the lower row, and the cells near the middle row are adjacent to the cell modules located in the middle row.
The cell arrangement structure of a battery pack according to claim 1, wherein the input end and the output end of the battery pack module are respectively located on the upper and lower sides of the battery pack module.
A cell arrangement method for a battery pack, characterized in that it comprises the steps of:

S1. Connect every two cells in parallel to form a group of cell modules to obtain multiple groups of cell modules;

S2. The distribution of the upper, middle and lower rows of multiple sets of battery modules are sequentially fitted to form a battery pack module;

S3. An electrical connector is provided on the upper side or lower side of the battery pack module, and the electrical connector is serially connected to the poles of each adjacent two groups of battery modules in a ∽-shaped wiring manner from a corner of any row in the upper or lower row of the battery pack module, and the polarities of the poles of the two groups of battery modules connected in series are opposite.
The method for arranging cells of a battery pack according to claim 6, wherein the step S1 is specifically:

Connect every two cells in parallel in the same polarity orientation to form a set of cell modules to obtain multiple sets of cell modules.
The method for arranging cells of a battery pack according to claim 6, wherein the step S2 is specifically:

Place N groups of battery modules horizontally in order to form the upper row, place 2N-1 groups of battery modules in a 60° oblique manner to form the middle row, and place N-1 groups of battery modules in order to form the lower row with all batteries in them horizontally, one of the batteries in each group of battery modules in the middle row is embedded between two adjacent batteries in the upper row, and each battery in the lower row of battery modules All fit between two adjacent batteries located in the middle row, and the N is a positive integer greater than 1.
The method for arranging cells of a battery pack according to claim 8, wherein the step S2 further comprises:

On the first side of the battery pack module where the four cells are in the same oblique direction, a group of first cell modules is provided, and the first cell modules are in the same oblique direction as the cell modules located in the middle row, the cells near the lower row of the first cell modules are adjacent to the cell modules located in the lower row, and the cells near the middle row are adjacent to the cell modules located in the middle row.
The method for arranging cells of a battery pack according to claim 6, wherein the input end and the output end of the battery pack module are respectively located on the upper and lower sides of the battery pack module.