Soft package battery series-parallel module

Abstract

The utility model discloses a kind of soft package battery series-parallel module, the two pieces of battery tray on each electric core group are located on the same side of the pole lug of battery tray is different pole;The bracket of one end of battery tray is integral aluminum strip plastic bracket, the bracket of the other end of battery tray is split aluminum strip plastic bracket;The pole lug of one side of the two pieces of electric core group of each electric core group is welded and fixed on integral aluminum strip of integral aluminum strip plastic bracket, and the pole lug of the other side of two pieces of electric core is respectively split welded with corresponding aluminum strip of split aluminum strip plastic bracket;The opposite side of the pole lug side of the multiple electric core groups after stacking is arranged current-sharing connection piece for each group of parallel battery.This module of the utility model is with one battery tray and two electric cores as a block structure, each block structure is connected in advance with 2 groups of electric core by integral aluminum strip plastic bracket, then corresponding series-parallel connection is carried out to block, can omit the welding of module one side busbar, material is saved, and welding time is reduced.

Description

Technical Field

[0001] This utility model relates to the field of soft-pack battery cell design technology, and in particular to a soft-pack battery series-parallel module. Background Technology

[0002] In existing pouch cells with tabs on both sides, when two cells share a battery tray for series-parallel module stacking, the series-parallel connection of the cells is mostly performed in the cell stacking direction. The modules on one side of the tray are then connected in series-parallel in the stacking direction before being connected to the modules on the other side for the same series-parallel connection. Figure 1 and Figure 2 As shown, this illustrates the structure of 2P8S in the prior art.

[0003] In existing technologies, this conventional series-parallel connection method requires welding series and parallel busbars to each stacked battery module. Furthermore, when stacking modules on both sides in series, a horizontally extended busbar is needed, or if the structural space is limited due to wiring harness arrangement, an additional adapter busbar is required. Moreover, this method requires busbar welding on both sides of the large module, resulting in high material and production costs.

[0004] When connecting multiple series of such pouch cells with dual-sided tabs, the characteristic of the tabs on both sides of the cell can be utilized to create an innovative design in the block structure of a two-core battery, breaking away from the original structure of dual-sided busbars.

[0005] Therefore, based on the above-mentioned technical problems, those skilled in the art urgently need to develop a new type of soft-pack battery series-parallel module. Utility Model Content

[0006] The purpose of this invention is to provide a soft-pack battery series-parallel module. After optimization, this module can reduce the welding of busbars on one side, thereby saving materials and reducing production costs to a greater extent.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] This utility model discloses a soft-pack battery series-parallel module, which has multiple sets of cell groups arranged along the stacking direction. Each cell group includes a battery tray and two cells arranged on the battery tray.

[0009] The two cells on the battery tray of each cell group have opposite tabs on the same side of the battery tray.

[0010] The battery tray is provided with brackets at both ends along its length, and the bracket at one end of the battery tray is an integrated aluminum strip plastic bracket, while the bracket at the other end of the battery tray is a separate aluminum strip plastic bracket.

[0011] The tabs on one side of the two cells in each cell group are welded and fixed to the integral aluminum strip of the integral aluminum strip plastic bracket, and the tabs on the other side of the two cells are separately welded to the corresponding aluminum strips of the split aluminum strip plastic bracket.

[0012] One side of the split aluminum strip plastic support of the stacked multiple battery cells is the output tab side, and the output tab side is welded to the busbar;

[0013] Each of the parallel-connected cells on opposite sides of the output tabs of the stacked cell groups is provided with a current-sharing connector.

[0014] Furthermore, the battery tray includes:

[0015] Tray body;

[0016] A mounting portion protruding from the end of the tray body, the mounting portion having mounting holes machined thereon.

[0017] Furthermore, the integrated aluminum strip plastic bracket includes:

[0018] An integral aluminum strip extending along the width direction of the tray body; and

[0019] A first plastic mounting block connected to both ends of the integrated aluminum strip and respectively cooperating with the corresponding mounting part;

[0020] The integrated aluminum strip is mounted to one end of the pallet body via the first plastic mounting block;

[0021] The tabs on the same side of the two cells on the battery tray of each cell group are welded and fixed to the integral aluminum strip to form a series structure.

[0022] Furthermore, the split-type aluminum strip plastic bracket includes:

[0023] Two aluminum strips extend along the width of the tray body, with a certain gap reserved between the two aluminum strips; and

[0024] Each aluminum strip is connected to a second plastic mounting block at the corresponding end of the aluminum strip segment, and each aluminum strip segment is assembled and fixed to the corresponding mounting part by the second plastic mounting block.

[0025] The tabs on one side of each of the two cells on the battery tray of each cell group are welded and fixed to the corresponding aluminum strip.

[0026] Furthermore, the flow equalization connecting piece is an aluminum sheet with a thickness of less than 1 mm.

[0027] In the above technical solution, the soft-pack battery series-parallel connection module provided by this utility model has the following beneficial effects:

[0028] The module of this utility model has a battery tray and two cells as a block structure. Each block structure has a set of two series of cells connected in advance through an integrated aluminum strip plastic bracket. Then the blocks are connected in series and parallel respectively, which can eliminate the need for bus welding on one side of the module, save materials and reduce welding time.

[0029] The module of this utility model only requires a thin aluminum sheet as a flow equalization connecting piece for each group of parallel block structures, eliminating the need for busbar welding on that side, thus saving materials and reducing production costs to a greater extent. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0031] Figure 1 Schematic diagram of module structure in existing technology Figure 1 ;

[0032] Figure 2 Schematic diagram of module structure in existing technology Figure 2 ;

[0033] Figure 3 This is a schematic diagram of the structure of a soft-pack battery series-parallel module disclosed in an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the other side of a soft-pack battery series-parallel module disclosed in an embodiment of this application;

[0035] Figure 5 This is a schematic diagram of a block structure of a soft-pack battery series-parallel module disclosed in an embodiment of this application;

[0036] Figure 6 This is an exploded view of a block structure of a soft-pack battery series-parallel module disclosed in an embodiment of this application;

[0037] Figure 7 This is a schematic diagram of the bottom surface of a battery tray for a soft-pack battery series-parallel module disclosed in an embodiment of this application;

[0038] Figure 8 This is a schematic diagram of the front structure of a soft-pack battery series-parallel module after the plastic brackets on both sides are installed on the battery tray, as disclosed in an embodiment of this application.

[0039] Figure 9This is a schematic diagram of the integrated aluminum strip plastic bracket for a soft-pack battery series-parallel module disclosed in an embodiment of this application;

[0040] Figure 10 This is a schematic diagram of the structure of a split aluminum strip plastic bracket for a soft-pack battery series-parallel module disclosed in an embodiment of this application;

[0041] Figure 11 This is a schematic diagram of the first structure of a current sharing connection piece for a soft-pack battery series-parallel module disclosed in an embodiment of this application;

[0042] Figure 12 This is a schematic diagram of a second structure of a current sharing connection piece for a soft-pack battery series-parallel module disclosed in an embodiment of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Battery cell; 2. Battery tray; 3. Integrated aluminum strip and plastic bracket; 4. Split aluminum strip and plastic bracket; 5. Busbar; 6. Current sharing connector;

[0045] 10. Block structure;

[0046] 201. Pallet body; 202. Installation section;

[0047] 301. One-piece aluminum strip; 302. First plastic mounting block;

[0048] 401. Aluminum strip split; 402. Second plastic mounting block. Detailed Implementation

[0049] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0050] See Figures 3 to 12 As shown;

[0051] This embodiment discloses a soft-pack battery series-parallel module, which has multiple sets of cell groups arranged along the stacking direction. Each cell group includes a battery tray 2 and two cells 1 arranged on the battery tray 2.

[0052] The two cells 1 on the battery tray 2 of each cell group have opposite polarities on the same side of the battery tray 2, that is, when the two cells 1 are arranged, the polarities of the tabs on the same side are opposite.

[0053] The battery tray 2 is provided with brackets at both ends along its length, and the bracket at one end of the battery tray 2 is an integrated aluminum strip plastic bracket 3, while the bracket at the other end of the battery tray 2 is a separate aluminum strip plastic bracket 4.

[0054] The tabs on one side of the two cells 1 in each cell group are welded and fixed to the integrated aluminum strip 301 of the integrated aluminum strip plastic bracket 3, and the tabs on the other side of the two cells 1 are respectively welded to the corresponding aluminum strips 401 of the split aluminum strip plastic bracket 4.

[0055] The stacked multiple battery cell groups have a split aluminum strip plastic bracket 4 with one side being the output tab side, and the output tab side is welded to the busbar 5;

[0056] Each parallel battery pack is provided with a current sharing connector 6 on the opposite side of the output tab side of the stacked multiple battery packs.

[0057] Specifically, this embodiment discloses a novel series-parallel module structure for a soft-pack battery. It uses a battery tray 2 with two battery cells 1 as a block structure 10, where the two battery cells 1 are arranged side-by-side on the same battery tray 2. First, this embodiment uses an integrated aluminum strip plastic bracket 3 on one side of the battery tray 2 to form a series connection between the two battery cells 1. Then, a separate aluminum strip plastic bracket 4 on the other side connects the tabs of the two battery cells 1 respectively, thus forming a "large battery cell" structure with a single-sided output tab in the block structure 10. Subsequently, the large battery cells can be stacked, and then a busbar 5 is welded to the output tab side of the stacked battery module. In this embodiment, for each parallel block structure 10, only a current-sharing connector 6 is needed, thus replacing half of the busbars in the traditional structure.

[0058] See Figures 5 to 7 As shown, the battery tray 2 of this embodiment includes a tray body 201 and a mounting portion 202 protruding from the end of the tray body 201, the mounting portion 202 being machined with mounting holes. This embodiment further defines the structure of the battery tray 2, which includes the tray body 201 and the mounting portion 202 at the end, with a space formed between the mounting portions 202 to accommodate the corresponding aluminum strip plastic bracket. At the same time, the mounting portion serves as a structure for assembling and fixing with the plastic mounting block of the corresponding aluminum strip plastic bracket.

[0059] See Figure 8 and Figure 9 As shown, the integrated aluminum strip plastic bracket 3 for the battery described above includes:

[0060] An integral aluminum strip 301 extending along the width direction of the pallet body 201; and

[0061] First plastic mounting blocks 302 are connected to both ends of the integrated aluminum strip 301 and respectively cooperate with the corresponding mounting parts 202;

[0062] The integrated aluminum strip 301 is mounted on one end of the pallet body 201 via the first plastic mounting block 302;

[0063] The tabs on the same side of the two cells 1 on the battery tray 2 of each cell group are welded and fixed to the integrated aluminum strip 301 to form a series structure.

[0064] First, this embodiment further defines the structure of the integrated aluminum strip plastic bracket 3, which is provided with an integrated aluminum strip 301 that matches one end of the battery tray 2, and plastic brackets are provided on the outer side and both ends of the integrated aluminum strip 301. At the same time, a first plastic mounting block 302 is provided at the end of the integrated aluminum strip 301 in the length direction. The first plastic mounting block 302 is used to cooperate with the mounting part 202 corresponding to the battery tray 2 to realize the installation of the integrated aluminum strip plastic bracket 3. After installation, the tabs on the same side of the two battery cells 1 on the battery tray 2 are welded and fixed to the integrated aluminum strip 301 to realize the series connection of the two battery cells 1.

[0065] See Figure 8 and Figure 10 As shown, the split aluminum strip plastic bracket 4 of this embodiment includes: two aluminum strip splits 401 extending along the width direction of the tray body 201, with a certain gap reserved between the two aluminum strip splits 401; and second plastic mounting blocks 402 respectively connected to the corresponding ends of the aluminum strip splits 401, each aluminum strip split 401 being assembled and fixed to the corresponding mounting part 202 through the second plastic mounting block 402; wherein, in this embodiment, the tabs on the corresponding sides of the two cells 1 on the battery tray 2 of each cell group are respectively welded and fixed to the corresponding aluminum strip splits 401.

[0066] Secondly, this embodiment further defines the structure of the split aluminum strip plastic bracket 4. It firstly consists of two aluminum strip components 401. Simultaneously, each aluminum strip component 401 has a second plastic mounting block 402 at its end (the ends furthest from each other). This second plastic mounting block 402 cooperates with the corresponding mounting portion 202 of the battery tray 2 to assemble and fix the aluminum strip component 401. After installation, the tabs on the output side of the battery cell are welded and fixed to the corresponding aluminum strip components 401.

[0067] Meanwhile, the connection between the aforementioned integrated aluminum strip plastic bracket 3 and split aluminum strip plastic bracket 4 and the two battery cells 1 of a block structure 10 forms a series-connected "large battery cell" with a single-sided output tab.

[0068] In the specific processing, firstly, an integrated aluminum strip plastic bracket 3 and a split aluminum strip plastic bracket 4 are installed on both sides of the battery tray 2. Then, two battery cells 1 are placed in opposite directions on the battery cell 1 placement space of the battery tray 2, so that the two end tabs of the battery cell 1 are respectively attached to the aluminum strip surface of the two different plastic brackets. Then, the battery cell end tabs are laser welded to the aluminum strip surface, so that the two battery cells 1 are connected in series through the plastic brackets with aluminum strips at both ends to form a set of 2 strings of battery cells 1. Then, the positive and negative end tabs of this set of 2 strings of battery cells 1 are rotated to the same side of the battery tray 2 to form a 2-string block structure 10.

[0069] Subsequently, this block is welded together in parallel and connected in series to form a module via a single-sided busbar 5 according to process requirements. On the other side, only a current sharing connecting piece 6 needs to be welded to each group of parallel blocks. Figure 3 , Figure 4 As shown in the diagram, this is a 2P8S module. Each block contains two strings of cells, which are then connected in parallel (2 parallel, 4 strings) to form a 2P8S module. In this type of 2P8S module, the busbar 5 is welded on one side, while the other side uses a current sharing connector 6 to replace half of the busbars in the traditional design.

[0070] See Figure 11 and Figure 12 As shown, the current equalization connecting piece 6 in this embodiment is an aluminum sheet with a thickness of less than 1 mm.

[0071] As an extended implementation method, the flow equalization connecting piece 6 in this embodiment can be designed as a snap-fit ​​structure and snap-fitted onto the corresponding bracket and welded. The plastic bracket in this embodiment can be designed with positioning posts or snap-fit ​​grooves for snap-fitting, which facilitates the installation and positioning of the flow equalization connecting piece.

[0072] In the above technical solution, the soft-pack battery series-parallel connection module provided by this utility model has the following beneficial effects:

[0073] The module of this utility model consists of a battery tray 2 and two battery cells 1 as a block structure 10. Each block structure 10 pre-connects a set of two battery cells 1 through an integrated aluminum strip plastic bracket 3. Then, the blocks are connected in series and parallel, which can eliminate the need for welding the busbar 5 on one side of the module, saving materials and reducing welding time.

[0074] The module of this utility model only requires a thin aluminum sheet as a flow equalization connecting piece 6 for each group of parallel block structures 10, eliminating the welding process of the busbar 5 on that side, thus saving materials and reducing production costs to a greater extent.

[0075] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A soft-pack battery series-parallel module, the series-parallel module having multiple sets of battery cells arranged along the stacking direction, each of the battery cells including a battery tray (2) and two battery cells (1) arranged on the battery tray (2); Its features ； The two cells (1) on the battery tray (2) of each cell group have opposite electrodes on the same side of the battery tray (2); The battery tray (2) is provided with brackets at both ends along its length direction, and the bracket at one end of the battery tray (2) is an integrated aluminum strip plastic bracket (3), while the bracket at the other end of the battery tray (2) is a split aluminum strip plastic bracket (4). The tabs on one side of the two cells (1) of each cell group are welded and fixed to the integral aluminum strip (301) of the integral aluminum strip plastic bracket (3), and the tabs on the other side of the two cells (1) are respectively welded to the corresponding aluminum strip (401) of the split aluminum strip plastic bracket (4). One side of the split aluminum strip plastic bracket (4) of the stacked multiple battery cell groups is the output tab side, and the output tab side is welded to the busbar (5); Each of the parallel-connected cells on opposite sides of the output tabs of the stacked cells is provided with a current sharing connector (6).

2. The soft-pack battery series-parallel module according to claim 1, characterized in that, The battery tray (2) includes: Tray body (201); A mounting portion (202) protrudes from the end of the tray body (201), and the mounting portion (202) is machined with mounting holes.

3. A soft-pack battery series-parallel module according to claim 2, characterized in that, The integrated aluminum strip plastic bracket (3) includes: An integral aluminum strip (301) extending along the width direction of the tray body (201); and A first plastic mounting block (302) is connected to both ends of the integrated aluminum strip (301) and respectively cooperates with the corresponding mounting part (202); The integrated aluminum strip (301) is mounted to one end of the pallet body (201) via the first plastic mounting block (302); The tabs on the same side of the two cells (1) on the battery tray (2) of each cell group are welded and fixed to the integral aluminum strip (301) to form a series structure.

4. A soft-pack battery series-parallel module according to claim 2 or 3, characterized in that, The split-type aluminum strip plastic bracket (4) includes: Two aluminum strips (401) extending along the width direction of the tray body (201), with a certain gap reserved between the two aluminum strips (401); and The second plastic mounting blocks (402) are respectively connected to the corresponding ends of the aluminum strip segments (401), and each aluminum strip segment (401) is assembled and fixed with the corresponding mounting part (202) through the second plastic mounting blocks (402); The tabs on the corresponding sides of the two cells (1) on the battery tray (2) of each cell group are welded and fixed to the corresponding aluminum strip (401).

5. A soft-pack battery series-parallel connection module according to claim 3, characterized in that, The flow equalization connecting piece (6) is an aluminum sheet with a thickness of less than 1 mm.

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