Soft package battery module structure

Abstract

The utility model relates to the technical field of battery modules, in particular to a soft package battery module structure which comprises a soft package battery cell, two end plates and a plurality of partition plates positioned between the two end plates, the two end plates and the multiple partition plates are stacked and locked through a pull rod assembly, a cavity is formed between every two adjacent partition plates, a soft package battery cell is installed in each cavity, the module structure comprises a plurality of conductive plates, each conductive plate comprises a main body plate, the main body plate is provided with a through hole, and the through hole is communicated with the cavity. Each tab penetrates through one through hole, and the tabs are welded and fixed with the main body plate. The safety of the device is further improved; multi-parallel and multi-series soft package battery cell arrangement is realized, so that a battery module with more voltage and capacitance requirements can be designed; therefore, the battery module is more stable in performance, higher in consistency and easier in low-cost large-scale production.

Description

Technical Field

[0001] The utility model relates to the technical field of battery modules, in particular to a soft-pack battery module structure. Background Art

[0002] Existing soft-pack lithium battery modules usually adopt a method of stacking soft-pack battery cells and then soldering the positive and negative pole ears. This method: first, it is only applicable to the arrangement of single battery cells in series, and cannot meet the arrangement of soft-pack battery cells in parallel and then in series, which limits the application scope of soft-pack battery cells; second, the safety of stacking soft-pack battery cells is not high; third, in practice, the soldering between the pole ears of the battery cells is mostly manual soldering, which makes it difficult to ensure the performance consistency of each pole ear after soldering, and cannot be mass-produced at low cost. Utility Model Content

[0003] The purpose of the utility model is to solve the problems pointed out in the background technology and to propose a soft-pack battery module structure.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A soft-pack battery module structure includes a soft-pack battery cell, the soft-pack battery cell includes a main body and a pole ear, the module structure also includes two end plates and a plurality of partitions located between the two end plates, the two end plates and the plurality of partitions are stacked and locked by a pull rod assembly, there is a cavity between every two adjacent partitions, a soft-pack battery cell is installed in each of the cavities, the module structure includes a plurality of conductive plates, the conductive plates include a main body plate, the main body plate is provided with a through hole, each of the pole ears penetrates one of the through holes, and the pole ears are welded and fixed to the main body plate.

[0006] Both sides of the partition plate are provided with grooves, and the grooves between adjacent partition plates form the chamber.

[0007] The partition plate is provided with a plurality of second through holes, the end plate is provided with a plurality of first through holes at positions directly opposite to the second through holes, and the pull rod assembly passes through the first through holes and the second through holes.

[0008] The pole ear is fixed to the main plate by laser welding.

[0009] Limiting grooves are arranged on both sides of the main body plate, a limiting protrusion is arranged on the top of the partition plate, the main body plate is supported on the top of the partition plate, and the limiting protrusion is limitedly matched with the limiting grooves.

[0010] A chamber is defined between the partition plate adjacent to the end plate and the end plate.

[0011] There are two chambers between the partition plate close to the end plate and the end plate, and there are two chambers between adjacent partition plates.

[0012] The utility model proposes a soft-pack battery module structure, which has the following beneficial effects: there is no direct contact between the soft-pack battery cells of the device, the possibility of short circuit between the battery cells is further reduced, and the mutual influence caused by the different temperatures and expansion of adjacent soft-pack battery cells is reduced, thereby further improving the safety of the battery pack; the soft-pack battery cell tabs are first welded to the aluminum bar, so that multiple soft-pack battery cells and the aluminum bar can be connected in parallel first, and then connected in series by the aluminum bar, thereby realizing a "multi-parallel and multi-series" arrangement of soft-pack battery cells, so that battery modules with more voltage and capacitance requirements can be designed; the battery module performance is more stable, the consistency is higher, and it is easier to mass-produce at low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the soft-pack battery cell of the utility model;

[0014] Figure 2 It is a schematic diagram of the overall assembly structure of the utility model;

[0015] Figure 3 for Figure 2 Cross-sectional structure diagram Figure 1 ;

[0016] Figure 4 for Figure 2 Cross-sectional structure diagram Figure 2 ;

[0017] Figure 5 This is a schematic diagram of the conductive plate structure of the utility model;

[0018] Figure 6 This is a schematic diagram of the end plate structure of the utility model;

[0019] Figure 7 This is a schematic diagram of the partition structure of the utility model.

[0020] In the figure: soft-pack battery cell 1, main body 2, pole ear 3, end plate 4, partition 5, pull rod assembly 6, conductive plate 7, chamber 8, main plate 10, through hole 11, limiting groove 12, first through hole 13, second through hole 14, limiting protrusion 15, groove 16. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Reference Figure 1-7A soft-pack battery module structure includes a soft-pack battery cell 1, the soft-pack battery cell 1 includes a main body 2 and a pole ear 3, the module structure also includes two end plates 4, and a plurality of partitions 5 located between the two end plates 4, the two end plates 4 and the plurality of partitions 5 are stacked and locked by a pull rod assembly 6, there is a chamber 8 between every two adjacent partitions 5, and a soft-pack battery cell 1 is installed in each chamber 8, the module structure includes a plurality of conductive plates 7, wherein the conductive plates 7 are made of aluminum bars or copper bars, the conductive plates 7 include a main body plate 10, the main body plate 10 is provided with a through hole 11, each pole ear 3 penetrates a through hole 11, and the pole ear 3 is welded and fixed to the main body plate 10.

[0023] When assembling the device, the soft-pack battery cells are first placed in the chamber between the partitions as required. After the soft-pack battery cells are placed, they are fixed into a whole by the end plates and the pull rod assembly. The pole ears of the soft-pack battery cells are then passed through the through holes of the conductive plates and the pole ears are arranged. Finally, the aluminum bus and the battery cell pole ears are welded together to obtain a battery module, wherein the pole ears 3 and the main plate 10 are preferably fixed by laser welding.

[0024] There is no direct contact between the soft-pack cells of the device, the possibility of short circuit between the cells is further reduced, and the mutual influence caused by the different temperatures and expansion of adjacent soft-pack cells is reduced, thereby further improving the safety of the battery pack; the pole ears of the soft-pack cells are first welded to the aluminum busbar, so that multiple soft-pack cells and aluminum busbars can be connected in parallel first, and then connected in series by the aluminum busbar, thereby realizing a "multi-parallel and multi-series" arrangement of soft-pack cells, so that battery modules with more voltage and capacitance requirements can be designed; the pole ears and aluminum busbars of the soft-pack cells are laser welded, so that the performance of the battery module is more stable, the consistency is higher, and it is easier to mass-produce at low cost.

[0025] refer to Figure 7 There are grooves 16 on both sides of the partition 5, and the grooves 16 between adjacent partitions 5 form a chamber 8. Grooves 16 are set on both sides of the partition 5, and two grooves 16 form a chamber 8 when adjacent partitions are stacked.

[0026] The partition 5 is provided with a plurality of second through holes 14, and the end plate 4 is provided with a plurality of first through holes 13 at positions opposite to the second through holes 14. The tie rod assembly 6 passes through the first through holes 13 and the second through holes 14, and the end plate 4 and the partition 5 are stacked and fixed by the tie rod assembly 6. For example, the tie rod assembly 6 includes a rod body with a head and a nut, and the end of the rod body has an external thread. After the rod body passes through the first through hole 13 and the second through hole 14, it is locked by the nut.

[0027] Limiting grooves 12 are provided on both sides of the main plate 10, and a limiting protrusion 15 is provided on the top of the partition 5. The main plate 10 is supported on the top of the partition 5, and the limiting protrusion 15 cooperates with the limiting grooves 12. Through the cooperation between the limiting protrusion 15 and the limiting groove 12, the difficulty of installing the conductive plate 7 on the partition 5 is reduced.

[0028] There is a chamber 8 between the partition 5 close to the end plate 4 and the end plate 4, and a chamber is also provided between the partition 5 and the end plate 4 to increase the number of soft-pack battery cells that can be placed.

[0029] As an implementation mode, there are two chambers 8 between the partition 5 close to the end plate 4 and the end plate 4, and there are two chambers 8 between adjacent partitions 5, that is, four chambers are formed on both sides of each partition, which increases the number of soft-pack battery cells placed and facilitates the series and parallel connection of the soft-pack battery cells 1.

[0030] The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited thereto. Any technical solution, concept, and design obtained by equivalent replacement or change based on the technical solution and utility model concept of the utility model by any technician familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model.

Claims

1. A soft-pack battery module structure, comprising a soft-pack battery cell (1), wherein the soft-pack battery cell (1) comprises a main body (2) and a tab (3), characterized in that: The module structure also includes two end plates (4) and a plurality of partitions (5) located between the two end plates (4). The two end plates (4) and the plurality of partitions (5) are stacked and locked by a pull rod assembly (6). There is a chamber (8) between each two adjacent partitions (5). A soft-pack battery cell (1) is installed in each chamber (8). The module structure includes a plurality of conductive plates (7). The conductive plates (7) include a main plate (10). The main plate (10) is provided with a through hole (11). Each of the pole ears (3) passes through one of the through holes (11). The pole ears (3) are welded and fixed to the main plate (10).

2. A soft pack battery module structure according to claim 1, characterized in that: Both sides of the partition plate (5) are provided with grooves (16), and the grooves (16) between adjacent partition plates (5) form the chamber (8).

3. A soft pack battery module structure according to claim 1, characterized in that: The partition plate (5) is provided with a plurality of second through holes (14), the end plate (4) is provided with a plurality of first through holes (13) opposite to the second through holes (14), and the pull rod assembly (6) passes through the first through holes (13) and the second through holes (14).

4. The soft pack battery module structure according to claim 1, characterized in that: The pole lug (3) is fixed to the main body plate (10) by laser welding.

5. The soft pack battery module structure according to claim 1, characterized in that: Limiting grooves (12) are provided on both sides of the main plate (10), a limiting protrusion (15) is provided on the top of the partition (5), the main plate (10) is supported on the top of the partition (5), and the limiting protrusion (15) is limitedly matched with the limiting grooves (12).

6. A soft pack battery module structure according to any one of claims 1 to 5, characterized in that: A chamber (8) is provided between the partition plate (5) close to the end plate (4) and the end plate (4).

7. A soft pack battery module structure according to claim 6, characterized in that: There are two chambers (8) between the partition (5) close to the end plate (4) and the end plate (4), and there are two chambers (8) between adjacent partitions (5).

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