A rhombic cell system

Abstract

The application provides a rhombic cell system. The system comprises cell monomers, busbars and a lower box. The cross section of the cell monomers is rhombic. The busbars are connected in series between adjacent cell monomers to form a cell group. The lower box is surrounded outside the cell group and is connected with the cell group through a baffle. The side surface of the lower box is inclined to the side surface of the cell group and the cell monomers. The cross section of the cell monomers formed by a winding process is designed as rhombic. The busbars of the series cell monomers in the rhombic cell system, the cold plate for providing heat exchange for the cell monomers and the baffle for fixedly connecting the rhombic cell group are adaptively designed. The rhombic cell system can realize similar performance parameters to the existing square battery or cylindrical battery, so as to solve the problem of avoiding the existing cell shape design limitation of the battery manufacturer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a rhombic battery cell system. BACKGROUND

[0002] In the existing battery system on the market, the limit arrangement of battery cell is pursued to improve the volume utilization of battery cell arrangement, from the previous small cylindrical battery cell to the current large square battery cell, blade battery cell and large cylindrical battery cell, etc., but these battery cell monomers and battery pack formed by group packaging are limited by the shape size of the battery manufacturer's patent, which cannot be directly applied by other battery manufacturers to achieve comprehensive universality and popularization, especially for blade battery cell and cylindrical battery cell, therefore, the subsequent battery manufacturers need to develop more feasible battery cells from other shape angles, so that the new battery cell shape can replace the blade battery and cylindrical battery, and the utilization rate of the battery pack is close to and equal to. SUMMARY

[0003] In view of the above-mentioned shortcomings of the prior art, the present application provides a rhombic battery cell system, by designing the cross section of the battery cell monomer formed by the winding process as a rhombus, and by adaptively designing the busbar of the series-connected battery cell monomer in the rhombic battery cell system, the cold plate for providing heat exchange for the battery cell monomer and the baffle for fixedly connecting the rhombic battery cell group, so that the rhombic battery cell system can realize similar performance parameters as the existing square battery or cylindrical battery, to solve the problem of avoiding the existing battery cell shape design limitation of the battery manufacturer.

[0004] The present application provides a rhombic battery cell system, comprising a battery cell monomer, a busbar and a lower box body.

[0005] The battery cell monomer has a first size A, a second size B and a height size C, the first size A and the second size B are the lengths of the adjacent two sides of the cross section of the battery cell monomer, the cross section of the battery cell monomer comprises two groups of the first size A sides and the second size B sides arranged in pairs, and the first size A is equal to the second size B, so that the cross section of the battery cell monomer is rhombic.

[0006] The busbar is connected to the same side surface of a plurality of adjacent battery cell monomers, so that the battery cell monomers are arranged in series to form a battery cell group.

[0007] The lower box body is surrounded on the outside of the battery cell group, and a baffle is arranged between the battery cell group and the lower box body, so that the battery cell group is connected in the lower box body through the baffle, and the side surface of the lower box body is inclined to the side surface of the battery cell group and the battery cell monomer.

[0008] In an embodiment of the present application, the lower box is inclined to any side of the cell monomer of the side surface of the cell group and / or any side of the cell monomer towards at least one pair of side surfaces of the cell group.

[0009] In an embodiment of the present application, the included angle formed by any side of the first size A and the two adjacent sides of the second size B, or the included angle formed by any side of the second size B and the two adjacent sides of the first size A comprises a first angle k and a second angle f, and the sum of the first angle k and the second angle f is 180°.

[0010] In an embodiment of the present application, the direction parallel to the side of the first size A and / or the side of the second size B is the stacking direction between the adjacent cell monomers in the cell group.

[0011] In an embodiment of the present application, the edge between the side of the first size A and the side of the second size B of the cell monomer is provided with a rounded corner, and the cell monomer is formed by a winding process.

[0012] In an embodiment of the present application, the baffle is provided in a "Fang" shape, and connected to the three side surfaces of the cell group through the inner side surface of the baffle, and connected to the corresponding inner side surface of the lower box through the outer side surface of the baffle.

[0013] In an embodiment of the present application, the inner side surface of the baffle towards the cell group is provided with a contour matching the outer surface of the cell monomer forming the side surface of the cell group.

[0014] In an embodiment of the present application, the tab of the cell monomer is located at the top of the cell monomer, and a corresponding pole is wrapped on the tab, the height dimension C of the cell monomer plus the height of the pole is a height dimension D, the height of the baffle is equal to the height dimension C, and the height of the space in the lower box containing the cell group is greater than the height dimension D.

[0015] In an embodiment of the present application, the pole is arranged parallel to the side of the first size of the cell monomer, or parallel to the side of the second size of the cell monomer, and the busbar covers and connects to the part of the pole parallel to the side of the first size A of the cell monomer, or parallel to the side of the second size B of the cell monomer.

[0016] In an embodiment of the present application, the cell monomers are connected in series in turn along the first size A direction and the second size B direction through the busbar alternately, so that the cell monomers in the cell group are connected to form a continuous S-shaped path.

[0017] In an embodiment of the present application, a first cold plate is arranged between adjacent battery cells connected in series, and the first cold plate is attached to two adjacent side surfaces of the battery cell.

[0018] In an embodiment of the present application, an insulating layer is arranged between the first cold plate and the battery cell.

[0019] In an embodiment of the present application, the bus bar includes a first bus bar, a second bus bar, and a third bus bar.

[0020] The first bus bar is connected to two adjacent battery cells in the direction of the first dimension A and the direction of the second dimension B, respectively.

[0021] The second bus bar is connected to two adjacent battery cells in the direction of the first dimension A.

[0022] The third bus bar is connected to two adjacent battery cells in the direction of the second dimension B.

[0023] In an embodiment of the present application, the first bus bar is connected between the battery cells on the side of the battery cell group not connected to the baffle and the opposite side; the second bus bar and the third bus bar are connected to the battery cells not connected to the first bus bar in the battery cell group.

[0024] In an embodiment of the present application, a heat-conducting layer is arranged between the battery cell group and the bottom of the lower box.

[0025] In an embodiment of the present application, the bottom of the lower box is provided with a second cold plate, and the heat-conducting layer is arranged between the battery cell group and the second cold plate.

[0026] In an embodiment of the present application, on the side of the lower box not connected to the baffle, the total positive bus bar and the total negative bus bar of the battery cell group, the first water inlet and outlet of the first cold plate, and the second water inlet and outlet of the second cold plate are arranged.

[0027] The present application also provides a rhombic battery cell arrangement method, comprising:

[0028] Based on the first dimension A and the second dimension B of two adjacent sides of the rhombic battery cell cross section, the relative position relationship of the stacked adjacent rhombic battery cells is determined.

[0029] According to the relative position relationship of the stacked adjacent rhombic battery cells, the adjacent rhombic battery cells are connected in series through the bus bar to form a battery cell group.

[0030] determining a height of a baffle connected to a side of the battery cell group based on a height dimension C of the rhombic battery cell;

[0031] determining a height of a lower case in which the battery cell group is installed based on a height dimension D of the rhombic battery cell and a pole formed on an upper end thereof;

[0032] determining a liquid cooling plate to be installed between the rhombic battery cells or between the battery cell group and the lower case based on a thermal management requirement of the battery cell group.

[0033] In an embodiment of the present application, the step of determining a relative position relationship between adjacent rhombic battery cells based on the first dimension A and the second dimension B of two adjacent sides of the rhombic battery cell cross section comprises:

[0034] parallelizing and co-planarizing the side of the first dimension A and the side of the second dimension B of adjacent rhombic battery cells to form the battery cell group by stacking; or

[0035] parallelizing and non-coplanarizing the side of the first dimension A and co-planarizing the side of the second dimension B of adjacent rhombic battery cells to form the battery cell group by stacking; or

[0036] parallelizing and co-planarizing the side of the first dimension A and non-coplanarizing the side of the second dimension B of adjacent rhombic battery cells to form the battery cell group by stacking.

[0037] In an embodiment of the present application, the step of determining a liquid cooling plate to be installed between the rhombic battery cells or between the battery cell group and the lower case based on a thermal management requirement of the rhombic battery cell comprises:

[0038] determining a first cooling plate of an integrated structure to be installed between adjacent rhombic battery cells based on a thermal management requirement of the battery cell group; or

[0039] determining a first cooling plate of a split structure to be installed between adjacent rhombic battery cells based on a thermal management requirement of the battery cell group; and / or

[0040] determining a second cooling plate to be installed between the battery cell group and the lower case based on a thermal management requirement of the battery cell group.

[0041] The present application further provides a battery pack comprising at least the rhombic battery cell system as described above and being encapsulated and formed into the battery pack by using the rhombic battery cell arrangement method as described above.

[0042] The beneficial effects of the present application: by designing the cross section of the winding process formed battery cell as a rhombus, the existing battery cell shape design of the battery manufacturer is avoided, and by adaptively designing the busbar of the series connected battery cell in the rhombus battery cell system, the cold plate providing heat exchange for the battery cell, and the baffle fixedly connecting the rhombus battery cell group, the rhombus battery cell system can realize similar performance parameters as the existing square battery or cylindrical battery.

[0043] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0044] The drawings incorporated into the specification and forming part of the specification, show embodiments consistent with the present application, and together with the specification, serve to explain the principles of the present application. It is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained from these drawings without creative labor for those skilled in the art. In the drawings:

[0045] Figure 1 is a perspective view of the rhombus battery cell system of the present application;

[0046] Figure 2 is a perspective view of the battery cell, and a shape size and angle parameter schematic diagram;

[0047] Figure 3 is a perspective exploded view of the rhombus battery cell system of the present application;

[0048] Figure 4 is a top view of Figure 1 ;

[0049] Figure 5 is a flow chart of the rhombus battery cell arrangement method of the present application.

[0050] In the drawings: 1, battery cell; 10, battery cell group; 101, first cold plate; 1011, first inlet and outlet; 102, second cold plate; 1021, second inlet and outlet; 11, pole; 20, busbar; 200, total positive busbar; 201, total negative busbar; 21, first busbar; 22, second busbar; 23, third busbar; 3, baffle; 30, outer surface contour; 4, lower box; 5, heat conduction layer. DETAILED DESCRIPTION

[0051] The present application will be described in more detail by the following specific examples. Other advantages and effects of the present application will be more clearly understood as techniques skilled in the art will be able to specify the present application from the description. The present application can also be implemented or applied by other different specific embodiments, and each detail described in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following examples and features in the examples can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present application are intended to describe specific embodiments, not to limit the scope of protection of the present application. The test methods in the following examples are not specified, and are generally performed under conventional conditions or under conditions recommended by the manufacturer.

[0052] Referring to Figures 1 to 5 It should be noted that the structures, proportions, sizes, etc. shown in the drawings accompanying the specification are merely intended to facilitate understanding and reading of the content disclosed by those skilled in the art, and are not intended to limit the conditions under which the present application can be implemented, and therefore do not have technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technology disclosed by the present application. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the specification are merely for the convenience of clear description, and are not intended to limit the scope of the present application, and the change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application.

[0053] Referring to Figure 1 and Figure 2 The present application provides a rhombic cell system, comprising a cell 1, a busbar 20, and a lower box 4.

[0054] The cell 1 has a first size A, a second size B, and a height size C, the first size A and the second size B are the lengths of two adjacent sides of the cross section of the cell 1, the cross section of the cell 1 includes two groups of first size A sides and second size B sides arranged in pairs, and the first size A is equal to the second size B, so that the cross section of the cell 1 is rhombic.

[0055] The busbar 20 is connected to the same side surface of a plurality of adjacent cells 1, so that the cells 1 are arranged in series to form a cell group 10.

[0056] The lower box 4 surrounds the outside of the cell group 10, and a baffle 3 is arranged between the cell group 10 and the lower box 4, so that the cell group 10 is connected in the lower box 4 through the baffle 3, and the side surface of the lower box 4 is inclined to the side surface of the cell group 10 and the cell 1.

[0057] The lower case 4 is inclined to any side of each battery cell 1 of the side surface of the battery cell group 10 and / or any side of the battery cell 1 on at least one pair of side surfaces of the battery cell group 10.

[0058] The included angle formed between any edge of the first dimension A and the two adjacent edges of the second dimension B, or the included angle formed between any edge of the second dimension B and the two adjacent edges of the first dimension A, includes a first angle k and a second angle f, and the sum of the first angle k and the second angle f is 180°.

[0059] In the embodiment, the first dimension A and the second dimension B of the cross-sectional edge length of the battery cell 1 are equal, and have a height dimension C, so that the battery cell 1 has a regular external contour. To determine the values of the first dimension A, the second dimension B and the height dimension C, the size parameters required by the performance of the battery cell group 10 composed of the battery cell 1 and packaged as a battery pack can be determined, for example, the optimal volume ratio can be selected according to the ratio between the edge length dimension of the battery cell 1 and the volume to improve the unit capacity of the battery cell 1, and the first dimension A, the second dimension B and the height dimension C of the edge length can also be determined according to the required heat conduction performance of the battery cell 1.

[0060] The battery cell 1 is composed of the busbar 20, the battery cell group 10 is fixedly installed in the lower case 4 by the baffle 3, and the side surface of the rhombic battery cell 1 and the battery cell group 10 composed of the same is inclined to the side surface of the lower case 4, thereby increasing the surface area of the side surface of the battery cell group 10, so as to form a rhombic battery system, which is different from the modeling features of the existing square battery and cylindrical battery. The battery cell 1 can be stacked and arranged like movable type printing, and the space utilization rate of the rhombic battery system is maintained.

[0061] It should be noted that the first angle k and the second angle f formed between the edge of the first dimension A of the battery cell 1 and the edge of the second dimension B can be respectively set as an acute angle and an obtuse angle according to requirements, so that the cross section of the battery cell 1 forms a rhombus. Similarly, the first angle k and the second angle f can also be equal, that is, the cross section of the battery cell 1 forms a square, so that the battery cell 1 has various shapes.

[0062] Please refer to Figure 1 , Figure 3 and Figure 4 In an embodiment, the direction parallel to the edge of the first dimension A and / or the edge of the second dimension B is the stacking direction between adjacent battery cells 1 in the battery cell group 10. The edge between the edge of the first dimension A and the edge of the second dimension B of the battery cell 1 is provided as a rounded corner, and the battery cell 1 is formed by a winding process.

[0063] The cell monomer 1 is arranged along the edge of the first dimension A and / or the edge of the second dimension B, so that the gap between the adjacent cells can be controlled at a low level, thereby maintaining the efficiency of the cell monomer 1 stacked into the cell group 10 by the bus bar 20. The edges of the cell monomer 1 in the diamond structure are rounded, so as to facilitate the accommodation of the pole piece and the separator of the cell monomer 1 formed by the winding process, and the rounded corners are also easier to produce than the sharp corners of the diamond shape.

[0064] Please refer to Figure 1 , Figure 3 and Figure 4 , in an embodiment, the baffle 3 is arranged in a "H" shape, and is connected to the three side surfaces of the cell group 10 through the inner side surface of the baffle 3, and is connected to the corresponding inner side surface of the lower box 4 through the outer side surface of the baffle 3. The inner side surface of the baffle 3 towards the cell group 10 is provided with an outer surface profile 30 matched with the outer surface of each cell monomer 1 forming the side surface of the cell group 10.

[0065] In this embodiment, by arranging the outer surface profile 30 on the surface of the baffle 3 fixedly connected to the cell group 10, the contact area between the baffle 3 and the cell group 10 is increased, providing better fixing and supporting effect, and enabling the diamond-shaped protrusions of the edge cell monomers 1 of the cell group 10 to be matched and connected to the inner side plane of the lower box 4 through the baffle 3.

[0066] Please refer to Figure 2 , in an embodiment, the tab of the cell monomer 1 is located at the top of the cell monomer 1, and a corresponding pole 11 is wrapped on the tab, the height dimension C of the cell monomer 1 plus the height of the pole 11 is the height dimension D, the height of the baffle 3 is equal to the height dimension C, and the space in the lower box 4 for accommodating the cell group 10 has a height greater than the height dimension D. The pole 11 is arranged parallel to the edge of the first dimension A of the cell monomer 1, or parallel to the edge of the second dimension B of the cell monomer 1, and the bus bar 20 is connected to the part of the pole 11 parallel to the edge of the first dimension A of the cell monomer 1, or parallel to the edge of the second dimension B of the cell monomer 1. So that the bus bar 20 reduces its own area under the premise of meeting the sufficient contact connection with the pole 11.

[0067] Please refer to Figure 4 , in an embodiment, the cell monomers 1 are connected in series by the bus bar 20 alternately along the first dimension A and the second dimension B, so that the cell monomers 1 in the cell group 10 are connected to form a continuous S-shaped path. A first cold plate 101 is arranged between the adjacent cell monomers 1 connected in series along the S-shaped path, and the first cold plate 101 is attached to the two adjacent side surfaces of the cell monomer 1. An insulating layer is arranged between the first cold plate 101 and the cell monomer 1.

[0068] In the embodiment, the first cold plate 101 is arranged between the battery cells 1 connected in series along the S-shaped path. The first cold plate 101 can be arranged independently or repeatedly bent to form the first cold plate 101 along the S-shaped path connected with the battery cells 1, and the edges of the battery cells 1 are rounded to facilitate the matching and fitting of the bent edges of the repeatedly bent first cold plate 101. The first cold plate 101 can cool the side surface of the battery cell 1, and the battery cell 1 can be uniformly and quickly cooled, and the tab of the battery cell 1 can be cooled. The area of the first cold plate 101 contacting the side surface of each battery cell 1 can be close to 50%, and the heat-conducting glue can be added to the bent part of the first cold plate 101 to increase the heat-conducting contact area with the adjacent battery cell 1, thereby improving the heat exchange performance of the first cold plate 101 on the battery cell 1.

[0069] Please refer to Figure 1 、 Figure 3 and Figure 4 In an embodiment, the bus bar 20 includes a first bus bar 21, a second bus bar 22, and a third bus bar 23. The first bus bar 21 is connected to two battery cells 1 along the direction of the first dimension A and the direction of the second dimension B. The second bus bar 22 is connected to two adjacent battery cells 1 along the direction of the first dimension A. The third bus bar 23 is connected to two adjacent battery cells 1 along the direction of the second dimension B. The first bus bar 21 is connected between the battery cells 1 on the side of the battery cell group 10 without the baffle 3 and the opposite side. The second bus bar 22 and the third bus bar 23 are connected to the battery cells 1 without the first bus bar 21 in the battery cell group 10.

[0070] In the embodiment, the bus bar 20 is used to connect the battery cells 1 in series to form the battery cell group 10. The diamond-shaped battery cells 1 are stacked to form the battery cell group 10, so that the first bus bar 21, the second bus bar 22, and the third bus bar 23 of the corresponding shape are selected according to the relative positions of the battery cells 1 in the series connection path. Similarly, under the premise of connecting the battery cells 1 in series, the first bus bar 21, the second bus bar 22, and the third bus bar 23 can be combined into an integrated design, and the welding points for electrical connection can be arranged in the area of the pole 11 connecting the adjacent battery cells 1.

[0071] Please refer to Figure 3 and Figure 4In an embodiment, a heat-conducting layer 5 is arranged between the cell group 10 and the bottom of the lower box 4. The bottom of the lower box 4 is provided with a second cold plate 102, and the heat-conducting layer 5 is arranged between the cell group 10 and the second cold plate 102. On the side of the lower box 4 where the baffle 3 is not connected, the total positive bus bar 200 and the total negative bus bar 201 of the cell group 10, the first water inlet and outlet 1011 of the first cold plate 101, and the second water inlet and outlet 1021 of the second cold plate 102 are arranged.

[0072] The heat-conducting layer 5 can be coated with a heat-conducting glue or other heat-conducting material to enhance the heat exchange performance between the cell group 10 and the lower box 4, and the heat-conducting glue can also be used to strengthen the fixation and improve the mechanical fixation strength of the cell monomer 1. The second cold plate 102 in the lower box 4 at the bottom of the cell group 10 can assist the super-fast charging condition of the cell group 10 and further enhance the heat exchange performance. The bottom of the cell group 10 is in thermal contact with the second cold plate 102 of the lower box 4 through the heat-conducting glue, and the second cold plate 102 is designed to be integrated in the lower box 4 to realize the functions of heat conduction and fixation. The heat-conducting glue does not necessarily have a structural fixation function, which depends on whether the diamond-shaped cell system has a structural glue between the cell monomers 1 or whether the diamond-shaped cell system has other design structures that can fix the cells, which will not be described here.

[0073] Please refer to Figure 5 The application also provides a diamond-shaped cell arrangement method, which comprises the following steps:

[0074] determining the relative position relationship between the adjacent diamond-shaped cells based on the first size A and the second size B of the adjacent two sides of the diamond-shaped cell cross section;

[0075] stacking the adjacent diamond-shaped cells in parallel and coplanar first size A sides and second size B sides to form the cell group 10; or

[0076] stacking the adjacent diamond-shaped cells in parallel and non-coplanar first size A sides and parallel and coplanar second size B sides to form the cell group 10; or

[0077] stacking the adjacent diamond-shaped cells in parallel and coplanar first size A sides and parallel and non-coplanar second size B sides to form the cell group 10;

[0078] connecting the adjacent diamond-shaped cells through the bus bar 20 to form the cell group 10 in series according to the relative position relationship between the adjacent diamond-shaped cells;

[0079] determining the height of the baffle 3 connected to the side of the cell group 10 based on the height size C of the diamond-shaped cell;

[0080] determining the height of the lower box 4 for installing the cell group 10 based on the height size D formed by the diamond-shaped cell and the pole 11 at the upper end thereof;

[0081] Based on the thermal management requirements of the cell pack 10, it is determined that a cold plate will be installed between the diamond-shaped cells or between the cell pack 10 and the lower casing 4.

[0082] In this embodiment, the rhombus-shaped battery cell can be understood as the battery cell unit 1 mentioned in the above embodiment. During the process of stacking the rhombus-shaped battery cells to form the battery cell group 10, different arrangement methods can be designed according to the possible positional relationships between adjacent rhombus-shaped battery cells, for example, […]. Figures 3-4 As shown, the rhomboid cells are aligned with each other, i.e., parallel and coplanar. Alternatively, adjacent rhomboid cells can be aligned in only one direction, while being offset in another direction, i.e., parallel and non-planar. This design improves the mechanical strength of the rhomboid cells in the offset direction, prevents overall slippage between multiple aligned rhomboid cells, and ensures the positional accuracy of the rhomboid cells assembled into cell group 10. It should be noted that, based on the various arrangement methods of the rhomboid cells in this embodiment, the differences from existing schemes that group individual cell 1s into cell group 10 are enhanced.

[0083] Based on the thermal management requirements of the rhomboid battery cells, the steps for determining the liquid cooling plates to be installed between the rhomboid battery cells or between the battery cell assembly 10 and the lower housing 4 include:

[0084] Based on the thermal management requirements of the battery cell assembly 10, it is determined that a first cold plate 101 with an integrated structure will be installed between adjacent diamond-shaped battery cells; or

[0085] Based on the thermal management requirements of the battery cell assembly 10, it is determined that a first cold plate 101 with a split structure will be installed between adjacent diamond-shaped battery cells; and / or

[0086] Based on the thermal management requirements of the battery cell assembly 10, it was determined that a second cold plate 102 would be installed between the battery cell assembly 10 and the lower casing 4.

[0087] As a component of the new energy vehicle platform architecture, the diamond-shaped battery cell system can adapt to different thermal management solutions within the same diamond-shaped battery cell system architecture to meet the thermal management requirements corresponding to the power parameters of different vehicle models. This optimizes the development cost of the platform architecture and expands the applicability of the diamond-shaped battery cell system.

[0088] Finally, the present invention further provides a battery pack, which includes at least the diamond-shaped cell system described above and is packaged and formed into a battery pack using the diamond-shaped cell arrangement method described above. This is to distinguish the diamond-shaped cell system from the cell shape design of existing battery manufacturers while maintaining similar functional parameters.

[0089] In summary, the rhombic cell system provided by the application avoids the existing cell shape design of battery manufacturers by designing the cross section of the cell monomer 1 formed by the winding process as a rhombus, and through adaptive design of the busbar 20 of the series-connected cell monomer 1 in the rhombic cell system, the cold plate for providing heat exchange for the cell monomer 1, and the baffle 3 for fixedly connecting the rhombic cell group 10, the rhombic cell system can realize similar performance parameters to existing square batteries or cylindrical batteries.

[0090] The above embodiments only exemplarily illustrate the principles and effects of the application, and are not used to limit the application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the application should be covered by the claims of the application.

Claims

1. A rhombic cell system, characterized by, The application relates to a battery cell group (10) and a battery cell group box (4) thereof. The battery cell group (10) comprises: a battery cell (1) having a first dimension A, a second dimension B and a height dimension C, the first dimension A and the second dimension B being the lengths of two adjacent sides of a section of the battery cell (1), the section of the battery cell (1) comprising two groups of the first dimension A and the second dimension B arranged in pairs, so that the section of the battery cell (1) is a rhombus; a busbar (20) connected to the same side surfaces of a plurality of adjacent battery cells (1) to form a series connection between the battery cells (1) to form the battery cell group (10); and a lower box (4) surrounding the outside of the battery cell group (10) and provided with a baffle (3) between the battery cell group (10) and the lower box (4), so that the battery cell group (10) is connected to the lower box (4) through the baffle (3), and the side surface of the lower box (4) is inclined to the side surface of the battery cell group (10) and the battery cell (1). The first cold plate (101) is arranged between the adjacent battery cells (1) connected in series, and the first cold plate (101) is attached to the two adjacent side surfaces of the battery cell (1); and an insulating layer is arranged between the first cold plate (101) and the battery cell (1). The baffle (3) is arranged in a "F" shape, and the inner side surface of the baffle (3) is connected to three side surfaces of the battery cell group (10), and the outer side surface of the baffle (3) is connected to the corresponding inner side surface of the lower box (4); the inner side surface of the baffle (3) is provided with an outer surface profile (30) matched with each battery cell (1) forming the side surface of the battery cell group (10).

2. The diamond shaped cell system of claim 1, wherein, The bottom of the lower box (4) is provided with a second cold plate (102), and a heat-conducting layer (5) is arranged between the battery cell group (10) and the second cold plate (102); on the side of the lower box (4) not connected with the baffle (3), a total positive busbar (200) and a total negative busbar (201) of the battery cell group (10), a first water inlet and outlet (1011) of the first cold plate (101) and a second water inlet and outlet (1021) of the second cold plate (102) are arranged. The tab of the battery cell (1) is located at the top of the battery cell (1), and a corresponding pole (11) is wrapped on the tab; the height dimension C of the battery cell (1) plus the height of the pole (11) is a height dimension D; the height of the baffle (3) is equal to the height dimension C; and the height of the space in the lower box (4) containing the battery cell group (10) is greater than the height dimension D.

3. The diamond shaped cell system of claim 2, wherein, The pole post (11) is arranged parallel to the edge of the first dimension A of the battery cell monomer (1) or parallel to the edge of the second dimension B of the battery cell monomer (1), and the bus bar (20) covers the part of the pole post (11) connected parallel to the edge of the first dimension A of the battery cell monomer (1) or parallel to the edge of the second dimension B of the battery cell monomer (1).

4. The diamond shaped cell system of claim 3, wherein, The battery cell monomers (1) are connected in series in turn along the direction of the first dimension A and the direction of the second dimension B through the bus bar (20) between the battery cell monomers (1), so that the battery cell monomers (1) in the battery cell group (10) are connected to form a continuous S-shaped path.

5. The diamond shaped cell system of claim 4, wherein, The bus bar (20) comprises: A first bus bar (21) connected on two battery cell monomers (1) along the direction of the edge of the first dimension A and the direction of the edge of the second dimension B, respectively; A second bus bar (22) connected on two adjacent battery cell monomers (1) along the direction of the edge of the first dimension A; and A third bus bar (23) connected on two adjacent battery cell monomers (1) along the direction of the edge of the second dimension B.

6. The diamond shaped cell system of claim 5, wherein, The first bus bar (21) is connected between the battery cell monomers (1) on one side of the battery cell group (10) where the baffle (3) is not connected and the opposite side thereof; the battery cell monomers (1) in the battery cell group (10) where the first bus bar (21) is not connected are respectively connected with the second bus bar (22) and the third bus bar (23).

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