Soft-package long-knife CTP battery pack structure

Abstract

The utility model relates to the field of battery pack structures, in particular to a flexibly-packaged long-knife CTP battery pack structure which comprises a flexibly-packaged long-knife battery module assembly, an end plate assembly, an aluminum plate assembly and an inter-module connecting aluminum sheet, the soft-package long-knife battery module assembly comprises a soft-package battery cell assembly and D-shaped connecting piece assemblies, and the D-shaped connecting piece assemblies are fixedly arranged on the two sides of the soft-package battery cell assembly; the end plate assemblies are fixedly arranged at the two ends of the soft-package long-knife battery module assembly; the inter-module connecting aluminum sheet is positioned at the joint of the positive electrode and the negative electrode of the soft-package long-knife battery module assembly; and the aluminum plate assembly comprises a plurality of aluminum plates positioned among the soft-package long-knife battery module assemblies. By adopting the improved soft package long knife CTP, the weight of a battery pack system is reduced, the cost is saved, meanwhile, the space is saved, the composition efficiency of the system is improved, and the total electric quantity is further improved.

Description

Technical Field

[0001] The utility model relates to the field of battery pack structures, and particularly relates to a soft-pack long-knife CTP battery pack structure. Background Art

[0002] CTP battery is a kind of module-free battery technology, which is an innovative technology for the internal structure of a battery pack. The system integration route of its soft-pack battery cells still mainly adopts the structure form of modules at present. In the module design, original structural parts such as end plates, side plates and upper covers are retained, and the structural parts are fixed by welding. At the same time, in order to meet the requirements of the overall package process, necessary assembly safety gaps still need to be reserved between the modules.

[0003] However, due to the retention of the original module form, there are a large number of structural parts in the package, and there are many welding processes in the production line. At the same time, because there are safety gaps between the modules, the structural design of the traditional cross beam will inevitably be adopted, resulting in low system integration efficiency. To sum up, the efficiency of the soft-pack battery system is low, and there are a large number of structural parts in the package, and the unit power cost has no obvious advantage compared with other battery cell forms, so the market acceptance is low. Content of the Utility Model

[0004] The utility model aims to provide a soft-pack long-knife CTP battery pack structure to solve the problems existing in the original module form.

[0005] The soft-pack long-knife CTP battery pack structure in this scheme includes a soft-pack long-knife battery module assembly, an end plate assembly, an aluminum plate assembly and an aluminum sheet for connecting between modules;

[0006] The soft-pack long-knife battery module assembly includes a soft-pack battery cell assembly and a D-shaped connecting piece assembly, and the D-shaped connecting piece assembly is fixedly arranged on both sides of the soft-pack battery cell assembly;

[0007] The end plate assembly is fixedly arranged at both ends of the soft-pack long-knife battery module assembly;

[0008] The aluminum sheet for connecting between modules is located at the connection between the positive and negative poles of the soft-pack long-knife battery module assembly;

[0009] The aluminum plate assembly includes a plurality of aluminum plates located between the soft-pack long-knife battery module assemblies.

[0010] Further, the number of the soft-pack long-knife battery module assemblies is 30.

[0011] Further, the length of the soft-pack CTP battery pack is 1275 mm.

[0012] Further, 29 aluminum plates are arranged in the aluminum plate assembly, and the aluminum plates are fixedly connected with the soft-pack long-knife battery module assembly through a heat-conducting structural adhesive.

[0013] Further, the aluminum plates are in contact with the liquid cooling plate of the battery assembly.

[0014] Further, four soft-pack battery cell assemblies are provided. The four soft-pack battery cell assemblies are first connected in parallel in pairs and then in series.

[0015] Further, the soft-pack long-knife battery module assembly further includes a tab connecting aluminum sheet and a foam assembly. The tab connecting aluminum sheet is fixedly arranged at the series connection position of the soft-pack battery cell assemblies, and the foam assembly is fixedly arranged between the battery cells of the soft-pack battery cell assemblies.

[0016] The beneficial effects of this solution are as follows:

[0017] By reducing the middle longitudinal beam structure, the volume utilization rate of the battery pack is significantly improved. The size of a conventional battery pack assembly (including the middle longitudinal beam and the assembly space) of about 40 mm is reduced to a connecting aluminum row with a thickness of 2 mm. The saved space can be used to lengthen the length of the battery cell body, thereby increasing the total power by about 5%. At the same time, a large number of structural parts can be reduced. Compared with the traditional module and PACK structure designs, structural parts such as module side plates, module bottom plates, and PACK longitudinal beams are reduced. The structure of this solution can cancel the welding processes such as module end side plates during the module production process, which can greatly reduce the BOM procurement and the production cost of the battery pack. Moreover, by adopting the improved soft-pack long-knife CTP, the weight of the battery pack system is reduced, the cost is saved. At the same time, the space saving also improves the system composition efficiency, thereby realizing the increase of the total power. Description of the Drawings

[0018] Figure 1 It is the front view of the soft-pack long-knife CTP battery pack in the embodiment of the soft-pack long-knife CTP battery pack structure of the present utility model;

[0019] Figure 2 It is the structural schematic diagram of the soft-pack long-knife battery module assembly in the embodiment of the soft-pack long-knife CTP battery pack structure of the present utility model;

[0020] Figure 3 It is the position schematic diagram of the foam assembly in the embodiment of the soft-pack long-knife CTP battery pack structure of the present utility model. Detailed Description of the Invention

[0021] The following is further detailed through specific embodiments.

[0022] The reference numerals in the accompanying drawings of the specification include: end plate assembly 1, inter-module connecting aluminum sheet 2, soft-pack long-knife battery module assembly 3, aluminum plate assembly 4, D-shaped connecting piece assembly 5, battery cell assembly 6, tab connecting aluminum sheet 7, foam assembly 8.

[0023] The soft-pack long-knife CTP battery pack structure, the length of the soft-pack long-knife CTP battery pack is 1275 mm, which matches the battery pack assembly with a width of 1400 mm that is highly applicable in the industry, such as Figure 1As shown in the figure: It includes a pouch long knife battery module assembly 3, an end plate assembly 1, an aluminum plate assembly 4, and an inter-module connecting aluminum sheet 2. The pouch long knife battery module assembly 3 includes a pouch cell assembly 6, a D-shaped connecting sheet assembly 5, a tab connecting aluminum sheet 7, and a foam assembly 8.

[0024] The pouch long knife battery module assembly 3 includes four pouch cell assemblies 6. As Figure 2 shown, two pouch cell assemblies 6 are first connected in parallel in pairs and then in series. The two sides of the pouch long knife battery module assembly 3 are welded and connected by a D-shaped connecting sheet assembly 5. The series connection part of the pouch cell assemblies 6 is welded and connected by a tab connecting aluminum sheet 7. The cells in the pouch cell assemblies 6 are bonded by a foam assembly 8. As Figure 3 shown.

[0025] The end plate assembly 1 is fixedly arranged at both ends of the pouch long knife battery module assembly 3. The end plate assembly 1 bears the clamping force during the transportation of the pouch long knife CTP battery pack. At the same time, after being assembled into a battery assembly, it undertakes the function of transmitting the expansion force of the cells to the battery assembly structural parts.

[0026] The aluminum plate assembly 4 includes 29 aluminum plates located between the pouch long knife battery module assemblies 3 in the battery pack. The aluminum plate assembly 4 is bonded to the pouch long knife battery module assembly 3 through a thermally conductive structural adhesive to enhance the structural performance of the pouch battery. At the same time, the aluminum plate is in contact with the traditional liquid cooling plate of the battery assembly. The good thermal conductivity of the aluminum plate can quickly cool and heat each cell assembly 6.

[0027] The inter-module connecting aluminum sheet 2 is located at the positive and negative connection points of the pouch long knife battery module assembly 3, playing a key role in conducting the positive and negative poles of the pouch long knife battery module assembly 3. After connecting 30 battery module assemblies, the circuit of the CTP battery pack is conducted.

[0028] In the implementation of this solution, first, in terms of the design of the module assembly, parts such as the side plates, bottom plates, and corresponding glues of the traditional module can be cancelled in terms of BOM materials. The side plates at the production line end, the welding process of the side plates and the bottom plates can be cancelled in the production process. The weight of a single CTP battery pack can be reduced by about 10 kg. Combined with the cancellation of the intermediate longitudinal beam structural parts, the total weight of the battery assembly is reduced by about 30 kg. Calculated by aluminum materials for the module and the battery assembly, the cost reduction of a single battery assembly is estimated to be in the range of 900 yuan - 1800 yuan. Calculated by 80 kWh, the maximum cost reduction per Wh is about 0.023 yuan. Secondly, the cancellation of the longitudinal beam structure can increase the length of the cell size by about 38 mm. Compared with the original design, the integration efficiency of the whole pack system is increased by about 5%. Taking 80 kWh as an example, using the pouch long knife CTP, the total power can be increased by about 4 kWh.

[0029] The above are only the embodiments of the present utility model, and common knowledge such as specific structures and characteristics known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the structure of the present utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope required by this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A soft-pack long knife CTP battery pack structure, characterized by: It includes soft-pack long-blade battery module assembly, end plate assembly, aluminum plate assembly and inter-module connecting aluminum sheet; The soft-pack long-blade battery module assembly includes a soft-pack battery cell assembly and a D-shaped connecting piece assembly, and the D-shaped connecting piece assembly is fixedly arranged on both sides of the soft-pack battery cell assembly; The end plate assembly is fixedly arranged at both ends of the soft-pack long blade battery module assembly; The inter-module connecting aluminum sheet is located at the connection between the positive electrode and the negative electrode of the soft-pack long blade battery module assembly; The aluminum plate assembly includes a plurality of aluminum plates located between the soft-pack long blade battery module assemblies.

2. According to claim 1, a soft-pack long knife CTP battery pack structure is characterized in that: The number of the soft-pack long blade battery module assemblies is 30.

3. The soft-pack long knife CTP battery pack structure according to claim 2 is characterized in that: The length of the soft-pack long knife CTP battery pack is 1275 mm.

4. The soft-pack long knife CTP battery pack structure according to claim 1, characterized in that: The aluminum plate assembly is provided with 29 aluminum plates, and the aluminum plates are fixedly connected to the soft-pack long blade battery module assembly through a thermally conductive structural adhesive.

5. The soft-pack long knife CTP battery pack structure according to claim 4, characterized in that: The aluminum plate is in contact with the liquid cooling plate of the battery assembly.

6. The soft-pack long knife CTP battery pack structure according to claim 1, characterized in that: The soft-pack battery cell assemblies are arranged in four pieces, and the four soft-pack battery cell assemblies are first connected in parallel in pairs and then in series.

7. The soft-pack long knife CTP battery pack structure according to claim 6, characterized in that: The soft-pack long-blade battery module assembly also includes a tab connecting aluminum sheet and a foam assembly. The tab connecting aluminum sheet is fixedly arranged at the series connection of the soft-pack battery cell assembly, and the foam assembly is fixedly arranged between the battery cells of the soft-pack battery cell assembly.

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