Soft package battery large module and battery pack

Abstract

The utility model discloses a soft package battery large module and battery pack, the soft package battery large module comprises an upper cover and a bottom plate which are distributed up and down, a plurality of battery cell groups which are distributed in m rows and n columns in a matrix are arranged between the upper cover and the bottom plate, m and n are integers greater than or equal to 2, two adjacent columns of battery cell groups are separated by a first partition plate, and the first partition plate is arranged between the upper cover and the bottom plate. Every two adjacent battery cell groups in the same column are separated by a second partition plate, and the edge of the upper cover is connected with the edge of the bottom plate through a connecting assembly; the utility model has the advantages that the volume grouping rate can be improved, the complexity of the assembly process is reduced, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to soft package battery technical field especially, it is related to a kind of soft package battery big module and battery pack. BACKGROUND

[0002] Soft package battery module has been widely applied in new energy automobile, electronic equipment and each field because of its advantages of large energy density, high safety and long service life.

[0003] Traditional soft package battery module includes cell group, module end plate, module side plate, module cover plate and the like structure, and cell group includes multiple soft package battery cells arranged along transverse direction, and module end plate, module side plate and module cover plate cooperate to wrap all soft package battery cells.When soft package battery module is combined into battery pack, multiple cross beams and multiple longitudinal beams are also arranged in the box body of battery pack to separate the box body into multiple cavities, and soft package battery module is one-to-one corresponding to cavity and is installed into corresponding cavity, so it is obvious that traditional soft package battery module needs to be additionally combined with more structural members, which not only leads to low volume combination rate of soft package battery module, reduces energy density, but also leads to complex assembly process and high production cost. SUMMARY

[0004] The utility model provides a kind of soft package battery big module and battery pack, which can improve volume combination rate, and help to reduce the complexity of assembly process and reduce production cost.

[0005] The technical scheme adopted by the utility model to solve the above technical problems is as follows: a soft package battery big module includes an upper cover and a bottom plate distributed upward and downward, a plurality of cell groups are arranged in an m-row-n-column matrix between the upper cover and the bottom plate, m and n are both integers greater than or equal to 2, the cell groups in adjacent two columns are separated by a first partition, the cell groups in the same column are separated by a second partition, and the edges of the upper cover are connected to the edges of the bottom plate by a connecting assembly.

[0006] Preferably, the cell group includes a plurality of soft package battery cells stacked from bottom to top, and a buffer pad is arranged between adjacent two soft package battery cells.

[0007] Preferably, one side of the soft package battery cell along the left-right direction is adhered to the first partition by structural adhesive, and the other side of the soft package battery cell along the left-right direction is provided with two tabs.

[0008] Preferably, the soft package battery cell at the uppermost layer is adhered to the upper cover by double-sided adhesive, and the soft package battery cell at the lowermost layer is adhered to the bottom plate by double-sided adhesive.

[0009] As preferred, the connecting assembly comprises n front side plates and n rear side plates, the n front side plates correspond to the n cell groups at the front side one by one and leave gaps, and the n rear side plates correspond to the n cell groups at the rear side one by one and leave gaps.

[0010] As preferred, the first partition plate is a first heating sheet or a first cooling plate.

[0011] As preferred, the second partition plate is a second heating sheet or a second cooling plate.

[0012] As preferred, the second partition plate is perpendicular to the first partition plate.

[0013] And a battery pack, comprising a box with an open upper end and an end cover, the end cover covers the upper end of the box, a third partition plate and the above-mentioned soft pack battery large module are fixedly arranged in the box, the third partition plate divides the box into a first chamber and a second chamber for installing a BMS assembly, the soft pack battery large module is arranged in the first chamber, and the bottom plate is bonded to the inner bottom surface of the first chamber through structural glue.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] 1. By arranging the cell groups in a matrix distribution between the upper cover and the bottom plate, the cell groups are separated by the first partition plate and the second partition plate, compared with the conventional soft pack battery module, the structure has fewer components, can make full use of the space, and improves the volume grouping rate.

[0016] 2. After reducing the structure, the structure of the soft pack battery large module is simpler, the material is less used, and the assembly process is simplified, which helps to reduce the complexity of the assembly process and reduce the production cost.

[0017] 3. Multiple cell groups share one upper cover and one bottom plate, compared with each soft pack battery module being matched with a module cover plate, the module has higher rigidity, does not need to be additionally matched with a structure for improving connection stability, helps to reduce the assembly process, and reduces the overall weight of the large module.

[0018] 4. By adopting the soft pack battery large module structure, the box of the battery pack does not need to be separated into multiple cavities for installing the soft pack battery module by the cross beam and the longitudinal beam, a large first chamber is used to install the soft pack battery large module, the structure of the battery pack is simplified, the volume grouping rate can be improved, the complexity of the assembly process can be reduced, and the production cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the soft pack battery large module in the utility model;

[0020] Figure 2 This is a front view of the large soft-pack battery module in this utility model;

[0021] Figure 3 This is a top view of the large soft-pack battery module of this utility model without the top cover;

[0022] Figure 4 This is an exploded view of the battery pack in this utility model.

[0023] In the diagram: 1. Top cover; 2. Bottom plate; 3. Cell assembly; 31. Soft-pack cell; 311. Electrode tab; 32. Buffer pad; 4. First partition; 5. Second partition; 6. Connecting assembly; 61. Front side panel; 62. Rear side panel; 7. Housing; 71. First chamber; 72. Second chamber; 8. End cover; 9. Third partition. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] Example 1: As Figures 1 to 3 As shown, a large soft-pack battery module includes an upper cover 1 and a bottom plate 2 distributed vertically. Multiple cell groups 3 arranged in an m-row, n-column matrix are disposed between the upper cover 1 and the bottom plate 2, where m and n are integers greater than or equal to 2. Adjacent columns of cell groups 3 are separated by a first partition 4, and adjacent cells 3 within the same column are separated by a second partition 5. The edge of the upper cover 1 is connected to the edge of the bottom plate 2 via a connecting assembly 6. Both the upper cover 1 and the bottom plate 2 are sheet metal parts, and the second partition 5 is perpendicular to the first partition 4.

[0027] In this embodiment, the connecting assembly 6 includes n front side plates 61 and n rear side plates 62. The n front side plates 61 correspond one-to-one with the n battery cell groups 3 located at the foremost side and are left with gaps. The n rear side plates 62 correspond one-to-one with the n battery cell groups 3 located at the rearmost side and are left with gaps. The front side plates 61 and rear side plates 62 are riveted to the upper cover 1 and the bottom plate 2 to ensure the rigidity of the overall large module. This is a conventional technical method in the field and will not be described in detail here.

[0028] Example 2:Figure 2 and Figure 3 As shown, the rest is the same as in Embodiment 1, except that the battery pack 3 includes multiple pouch cells 31 stacked from bottom to top, with a buffer pad 32, such as cushioning foam, between adjacent pouch cells 31. In this structure, the pouch cells 31 are stacked along the height (Z) direction, and the height of the entire pack can be defined according to customer needs to better match the customer's envelope and achieve shared use by both passenger and commercial users.

[0029] In this embodiment, the flexible battery cell 31 is bonded to the first partition 4 on one side along the left-right direction using structural adhesive, and two tabs 311 are provided on the other side along the left-right direction. The bonding of the flexible battery cell 31 to the first partition 4 helps to improve the stability of the structure. Furthermore, the battery cell assembly 3 is also provided with a tab support and a sampling FPC on one side of the tabs 311, which is a conventional structural design and will not be described in detail here.

[0030] In this embodiment, the topmost soft-pack battery cell 31 is bonded to the top cover 1 with double-sided adhesive, and the bottommost soft-pack battery cell 31 is bonded to the bottom plate 2 with double-sided adhesive. In case of failure, repairs can be performed by disassembling the top cover 1 and the bottom plate 2, which provides maintainability compared to conventional sealing methods using structural adhesive.

[0031] Example 3: Figure 3 As shown, the rest of the components are the same as in Embodiment 1, except that the first partition 4 is a first heating element or a first cooling plate, and the second partition 5 is a second heating element or a second cooling plate. By setting the partitions as heating elements or cooling plates, functionality is achieved, and applicability is improved. In this structure, the heating elements and cooling plates are located between two adjacent battery cell groups 3, enabling double-sided heating and double-sided heat dissipation. Compared to the single-sided heating and single-sided heat dissipation of conventional structural designs, the performance is better, and it also helps to reduce the number of heating elements and cooling plates used.

[0032] Specifically, the following four combinations are possible: a. The first partition 4 uses a first heating element, and the second partition 5 uses a second heating element; b. The first partition 4 uses a first heating element, and the second partition 5 uses a second cooling plate; c. The first partition 4 uses a first cooling plate, and the second partition 5 uses a second heating element; d. The first partition 4 uses a first cooling plate, and the second partition 5 uses a second cooling plate. The specific combination depends on the actual situation.

[0033] It should be noted that the heating element generates heat when energized, and the heat can be transferred to the battery cell assembly 3 to increase the operating temperature of the battery cell assembly 3 and solve the problem of the battery not working in low temperatures in winter; the cooling plate is generally a liquid cooling plate, and the heat generated by the battery during operation is dissipated through the liquid cooling plate to avoid the battery overheating.

[0034] Example 4:Figure 4 As shown, a battery pack comprises a box 7 with an open upper end and an end cover 8 covering the upper end of the box 7, a third partition plate 9 and any one of the soft package battery large modules of embodiments one to three are fixedly arranged in the box 7, the third partition plate 9 divides the box 7 into a first chamber 71 and a second chamber 72 for mounting a BMS assembly, the soft package battery large module is arranged in the first chamber 71, and the bottom plate 2 is bonded to the inner bottom surface of the first chamber 71 through structural glue.

[0035] The utility model has been described above in combination with the drawings, and obviously, the implementation of the utility model is not limited by the above-mentioned mode, as long as various improvements are made by adopting the method concept and technical scheme of the utility model, or the concept and technical scheme of the utility model is directly applied to other occasions without improvement, which are all within the protection scope of the utility model.

Claims

1. A soft package battery large module comprising an upper cover (1) and a bottom plate (2) distributed upward and downward, characterized in that: A plurality of battery cell groups (3) are arranged in an m-row n-column matrix between the upper cover (1) and the bottom plate (2), m and n are both integers greater than or equal to 2, two adjacent rows of the battery cell groups (3) are separated by a first partition plate (4), two adjacent battery cell groups (3) in the same column are separated by a second partition plate (5), and the edges of the upper cover (1) are connected to the edges of the bottom plate (2) by a connecting assembly (6). The battery cell group (3) comprises a plurality of soft package battery cells (31) stacked from bottom to top, and a buffer pad (32) is arranged between two adjacent soft package battery cells (31). 2.The soft-pack battery large module according to claim 1, characterized in that: The soft package battery cell (31) is bonded to the first partition plate (4) on one side in the left-right direction by structural adhesive, and two tabs (311) are arranged on the other side of the soft package battery cell (31) in the left-right direction. 3.The soft-pack battery large module of claim 1, wherein: The soft package battery cell (31) on the uppermost layer is bonded to the upper cover (1) by double-sided adhesive, and the soft package battery cell (31) on the lowermost layer is bonded to the bottom plate (2) by double-sided adhesive. 4.The soft-pack battery large module of claim 1, wherein: The connecting assembly (6) comprises n front side plates (61) and n rear side plates (62), the n front side plates (61) correspond one-to-one to the n battery cell groups (3) on the front side with a gap, and the n rear side plates (62) correspond one-to-one to the n battery cell groups (3) on the rear side with a gap. 5.The soft-pack battery large module of claim 1, wherein: The first partition plate (4) is a first heating sheet or a first cooling plate. 6.The soft-pack battery large module of claim 1, wherein: The second partition plate (5) is a second heating sheet or a second cooling plate. 7.The soft-pack battery large module of claim 1, wherein: The second partition plate (5) is perpendicular to the first partition plate (4).

8. A battery pack comprising a box (7) with an open upper end and an end cap (8) capping the upper end of the box (7), characterized in that: A third partition plate (9) and a soft package battery module as claimed in any one of claims 1-7 are fixedly arranged in the box (7), the third partition plate (9) divides the box (7) into a first chamber (71) and a second chamber (72) for installing a BMS assembly, the soft package battery module is arranged in the first chamber (71), and the bottom plate (2) is bonded to the inner bottom surface of the first chamber (71) by structural adhesive.

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