Novel soft package large module

Abstract

The utility model provides a novel soft package large module which comprises at least two battery cell piles, each battery cell pile is composed of a plurality of single battery cells, the single battery cells are arranged in the horizontal direction, the two ends of each single battery cell are provided with tabs, a busbar is arranged between every two adjacent battery cell piles, and the busbar is arranged between the two adjacent battery cell piles. Circuit boards are arranged on the two sides of the top end of the cell stack, and the busbar is connected with the circuit boards through acquisition terminals; according to the utility model, the collecting nickel sheets are selected to be placed on the battery cell stacks, and the busbar is designed to be rectangular-ambulatory-plane or L-shaped, so that a welding area for collecting the nickel sheets is reserved from the top of the module to form a weldable surface, and the collecting nickel sheets only need to be lapped on the upper end surface of the busbar for welding, so that the voltage and temperature collection can be completed; the collection wire harness or the flexible circuit board is placed above the cell stack, so that the collection quantity can be increased without occupying the welding width of the tab, and the overcurrent capability of the series connection part of the cells is improved.

Description

Technical Field

[0001] The utility model relates to the field of lithium-ion batteries, in particular to a novel soft-pack large module. Background Art

[0002] Under the current development trend of large-capacity soft-pack cells, soft-pack large modules have become a new direction. Compared with a large module consisting of a single cell stack, a soft-pack large module consisting of multiple cell stacks in series has greater advantages in all aspects and is bound to become the trend of soft-pack large modules in the future. At the same time, the number of strings of a large module consisting of multiple cell stacks has increased significantly, and the voltage and temperature points that need to be collected have also increased accordingly.

[0003] In the traditional data collection scheme, the data collection harness or flexible circuit board is installed and fixed in the direction of the battery cell ear lead-out, and the data collection nickel sheet is welded to the surface of the bus, which needs to be staggered to avoid the battery cell ear. This scheme is convenient and feasible when there are not many data collection voltage points and temperature points.

[0004] However, for large soft-pack modules with multiple battery cells connected in series, the number of voltage and temperature collections will increase as the number of strings increases. The number of collection harnesses or the size of the flexible circuit board will increase significantly, while the size of the battery cell tab lead-out terminal will not increase. Therefore, there is not enough space to install the collection harness or the flexible circuit board on the bus bracket. In addition, the length of the soft-pack battery cell cannot be increased indefinitely, so the battery cells need to be connected in series, and the voltage collection design at this series position will be difficult.

[0005] To this end, we propose a new type of soft-pack large module to solve the above problems. Utility Model Content

[0006] The utility model aims to solve the shortcomings in the prior art and proposes a new type of soft package large module.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A new type of soft-pack large module includes at least two battery cell stacks, each of which is composed of a plurality of single battery cells. The single battery cells are placed horizontally, and both ends of the single battery cells are provided with pole ears. A bus is provided between two adjacent battery cell stacks, and circuit boards are provided on both sides of the top of the battery cell stack. The bus is connected to the circuit board through a collection terminal.

[0009] Further preferably, the pole ears are fixed to the busbar by welding.

[0010] Further preferably, the collecting terminal is in a Z shape, the bottom end of the collecting terminal is fixed to the top end of the bus bar, and the top end of the collecting terminal is fixed to the circuit board.

[0011] Further preferably, fixed end plates are provided at both ends of the battery cell stack, and the fixed end plates are symmetrically arranged with the battery cell stack as the center.

[0012] Further preferably, flame retardant foam is provided between the plurality of single battery cells.

[0013] Further preferably, the flame retardant foam and the single battery core are bonded and fixed by a thermally conductive structural adhesive.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] In the utility model, it is no longer placed on the battery cell ear lead-out method, but is placed on each battery cell stack. At the same time, the bus is designed to be a U-shape or an L-shape, so that a welding area for collecting nickel sheets is reserved from the top of the module to form a weldable surface. The collecting nickel sheets only need to be overlapped on the upper end surface of the bus, and welding can be performed to complete the voltage and temperature collection. By placing the collecting wiring harness or flexible circuit board above the battery cell stack, the number of collections can be increased without occupying the ear welding width, thereby improving the current capacity of the battery cell series connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a new type of soft-pack large module structure provided by the utility model;

[0017] Figure 2 for Figure 1 Schematic diagram of the explosion structure of the China Electric Power Core Stack;

[0018] Figure 3 for Figure 1 A schematic diagram of the enlarged structure in the middle.

[0019] In the figure: 1. Battery cell stack; 2. Circuit board; 3. Single battery cell; 4. Flame retardant foam; 5. Fixed end plate; 6. Tab; 7. Bus; 8. Collection terminal. Implementation

[0020] Reference Figure 1-3 A new type of soft-pack large module includes at least two battery cell stacks 1, each of which is composed of a plurality of single battery cells 3. The plurality of single battery cells 3 are placed horizontally. The horizontal placement allows the placement of a plurality of battery cell stacks 1 in a receiving cavity, which can effectively improve the energy density.

[0021] Both ends of the multiple single cells 3 are provided with pole ears 6, and a bus bar 7 is provided between two adjacent cell stacks 1. The pole ears 6 are fixed to the bus bar 7 by welding. The welding fixing method can improve the stability of the connection between the pole ears 6 and the bus bar 7, and the pole ears 6 are not easy to fall off;

[0022] Circuit boards 2 are provided on both sides of the top of the battery cell stack 1. The busbar 7 is connected to the circuit board 2 through a collection terminal 8. The collection terminal 8 is in a Z shape. The bottom of the collection terminal 8 is fixed to the top of the busbar 7. The top of the collection terminal 8 is fixed to the circuit board 2. The collection terminal 8 can also improve the stability of the busbar 7 and the circuit board 2 after connection.

[0023] In the present invention, it is no longer placed on the lead-out method of the cell pole ear 6, but is placed on each cell stack 1. At the same time, the busbar 7 is designed to be in a U-shape or an L-shape, so that a welding area for collecting nickel sheets is reserved from the top of the module to form a weldable surface. The collecting nickel sheets only need to be overlapped on the upper end surface of the busbar 7, and the voltage and temperature collection can be completed by welding. By placing the collecting harness or flexible circuit board 2 above the cell stack 1, the number of collection can be increased without occupying the welding width of the pole ear 6, and the current capacity of the cell series connection can be improved.

[0024] Fixed end plates 5 are provided at both ends of the battery stack 1. The fixed end plates 5 are symmetrically arranged with the battery stack 1 as the center. The fixed end plates 5 will fasten the battery stack 1 from both ends of the battery stack 1, which can improve the stability of the battery stack 1 and limit the battery stack 1 on both sides of the battery stack 1, so that the battery stack 1 is not easy to shift.

[0025] Flame-retardant foam is arranged between the multiple single battery cells 3, which can block the propagation of heat in the multiple single battery cells 3, effectively prevent the heat generated by the single battery cells 3 from being transferred to each other, effectively reduce the temperature, and reduce the probability of fire.

[0026] The flame retardant foam and the single battery cell 3 are bonded and fixed by means of a heat conductive structural adhesive. In addition to bonding the heat resistant foam 4 and the single battery cell 3, the heat conductive structural adhesive can also dissipate heat and reduce temperature, thereby improving the safety of the single battery cell 3 and the battery cell stack 1.

Claims

1. A new type of soft-pack large module, comprising at least two battery cell stacks, wherein the plurality of battery cell stacks are composed of a plurality of single battery cells, the plurality of single battery cells are placed horizontally, and both ends of the plurality of single battery cells are provided with pole ears, characterized in that: A busbar is arranged between two adjacent battery cell stacks, and circuit boards are arranged on both sides of the top of the battery cell stack. The busbar is connected to the circuit board through a collection terminal.

2. A new type of soft package large module according to claim 1, characterized in that: The pole ears are fixed to the busbars by welding.

3. A new type of soft package large module according to claim 1, characterized in that: The collecting terminal is in a Z shape, the bottom end of the collecting terminal is fixed to the top end of the bus bar, and the top end of the collecting terminal is fixed to the circuit board.

4. A new type of soft package large module according to claim 1, characterized in that: Fixed end plates are provided at both ends of the battery cell stack, and the fixed end plates are symmetrically arranged with the battery cell stack as the center.

5. A new type of soft package large module according to claim 1, characterized in that: Flame-retardant foam is arranged between the plurality of single battery cells.

6. A new type of soft package large module according to claim 5, characterized in that: The flame retardant foam and the single battery core are bonded and fixed by heat conductive structural adhesive.

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