CN115966850A - Arrangement method of a pouch battery module - Google Patents

Abstract

The invention provides an arrangement method of soft package battery modules, which comprises the following steps: s1, arranging a plurality of bare electric core pieces; s2, correspondingly arranging a single Tab sheet between at least part of adjacent bare cell pieces, wherein each Tab sheet is respectively connected with electrode lugs with opposite electrical properties on the adjacent bare cell pieces; or, the electrode tabs which are opposite in electrical property are directly connected to at least part of the adjacent naked cell pieces. Set up like this, on the one hand, be convenient for a plurality of frocks are installed simultaneously and are set up the Tab piece or connect adjacent utmost point ear, and the production efficiency is improved, on the other hand, compare in single naked electric core piece install the Tab piece back at positive negative pole ear, the Tab piece on the different naked electric core pieces of reconnection, set up like this, reduce the Tab piece use amount, therefore, the cost is reduced, and reduce the space occupancy of Tab piece and utmost point ear, and the weight of single average weight of electric core and total battery module, promote the energy density of electric core and module, and simultaneously, reduce the number of times of connection of utmost point ear and Tab piece, promote module production efficiency.

Description

Arrangement method of a pouch battery module

technical field

The invention relates to the technical field of batteries, in particular to a method for arranging soft pack battery modules.

Background technique

Soft-pack batteries, also known as polymer batteries, are mainly composed of positive and negative electrodes, separators, positive and negative electrodes, packaging films and electrolytes. The outer casing protects the internal structure and prevents the internal electrolyte from leaking. When short circuit and other problems cause inflation, the flexible structure of the packaging film will only crack to avoid battery explosion and other problems. Compared with conventional lithium batteries, the safety performance is better.

The pouch cell of the pouch battery is guided by connecting tabs on the positive and negative tabs respectively, so as to realize the function of output voltage and current. It can be used as the positive and negative poles of the cell to connect with other cells or electrical appliances. At present, When the soft-packed battery is formed, the positive and negative tabs of a single battery are connected with a Tab piece. When different soft-packed batteries are connected, they are connected through the Tab piece and the Tab piece. This setting increases the The material cost of the battery cell reduces the space utilization rate and energy density of the battery.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art that each battery cell in the pouch battery is provided with its own tab sheet on both sides, the material cost is high, and the space utilization rate and energy density of the battery are low, thereby A method for arranging pouch battery modules is provided.

The invention provides a method for arranging a pouch battery module, comprising: S1. arranging and arranging a plurality of bare cell parts; respectively connecting the electrode lugs with opposite electrical properties on the adjacent bare electric core parts; or directly connecting at least part of the electrically opposite electrode tabs on the adjacent bare electric core parts.

Step S1 includes: setting at least one group of bare electric cores; arranging the adjacent bare electric cores in the same group, so that the electrode tabs on the opposite side of the adjacent bare electric cores are opposite and adjacent to each other; for The bare cell parts at the end of the bare cell row group define the electrode tab at the edge position as the edge tab, and arrange the adjacent bare cell row groups so that the adjacent bare cell row groups The corresponding edge tabs are electrically opposite.

Step S2 includes: on the two adjacent bare electric core parts in the same group, between the two adjacent electrode lugs with opposite electrical properties, connect and set a single Tab piece; on the edge tab, connect and set a single Tab slice, and define it as an edge Tab slice.

Step S2 also includes: connecting and setting a single tab between the corresponding two edge tabs on the adjacent bare cell row; or, setting the corresponding two edge tabs on the adjacent bare cell row integrally .

Step S2 also includes: on two adjacent bare electric core parts in the same group, directly connect two adjacent electrode lugs with opposite electrical properties; The tabs are directly connected.

At least the bare cell parts in the same group are evenly spaced and arranged.

Tab piece is made of nickel, or aluminum, or copper.

The tab pieces are respectively welded and connected to the electrode lugs of the bare cell parts.

The arrangement method of the pouch battery module also includes: S3. Encapsulating each bare cell.

Step S3 includes: S31. setting a plurality of aluminum-plastic films, in which each bare cell is correspondingly loaded; S32. injecting electrolyte into the aluminum-plastic films; S33. packaging the aluminum-plastic films.

The technical solution of the present invention has the following advantages:

After the bare electric core parts are arranged, a single Tab piece is set between the opposite electrical lugs of adjacent bare electric core parts to connect, or directly connected, so that, on the one hand, it is convenient for multiple tooling to install Tab Tabs or adjacent tabs are connected to improve production efficiency. On the other hand, compared with a single bare cell component, after installing Tabs on the positive and negative tabs, and then connecting Tabs on different bare cell components, this setting, Reduce the use of tabs, reduce costs, and reduce the space occupancy of tabs and tabs, as well as the average weight of a single cell and the weight of the total battery module, increase the energy density of cells and modules, and reduce tabs The number of connections with the Tab chip improves the production efficiency of the module.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

Fig. 1 is a schematic structural diagram of a group of bare cell arrays in a pouch battery module provided in an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of multiple sets of bare cell arrays of the pouch battery module shown in Fig. 1;

FIG. 3 is a schematic structural diagram of multiple groups of bare cell arrays in the prior art.

Explanation of reference signs:

1. Bare cell array; 2. Bare cell parts; 21. Electrode lugs; 3. Tab sheet; 4. Aluminum-plastic film.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as there is no conflict with each other.

As shown in Figures 1-3, this embodiment provides a method for arranging pouch battery modules, including:

S1. A number of bare cell parts 2 are arranged in a row. In this embodiment, the bare cell parts 2 include positive and negative pole pieces, a diaphragm, and positive and negative pole tabs. The diaphragm is arranged between the positive pole piece and the negative pole piece. Separate the two to avoid short circuit. It is insulated itself, specifically a semi-permeable membrane, through which ions in the electrolyte can pass. In addition, as a preferred embodiment, the positive and negative tabs are respectively arranged on the positive and negative pole pieces At the end, the electric energy of the positive and negative pole pieces can be transferred to the external circuit. The tabs of the positive and negative electrodes are arranged in the form of metal, specifically, the tabs of the positive electrode are provided in the form of aluminum sheets, and the tabs of the negative electrodes are provided in the form of copper sheets or nickel sheets. Further, preferably, the directions in which the electrodes of the bare cell components 2 are arranged are along the same direction.

In this embodiment, S2. corresponds to setting a single Tab sheet 3 between some adjacent bare cell parts 2, and the Tab sheet 3 is a conductive sheet made of nickel, aluminum, or copper, and the material is hard Material whose thickness is greater than the thickness of the positive and negative tabs. Each tab piece 3 is respectively connected to the electrode lug 21 of the opposite electrical property on the adjacent bare cell component 2 .

As an alternative embodiment, a single Tab sheet 3 is provided between each adjacent bare cell component 2 , and each Tab sheet 3 is respectively connected to the electrically opposite electrode lugs 21 on the adjacent bare cell components 2 .

As another alternative embodiment, the electrically opposite electrode tabs 21 on some adjacent bare cell parts 2 are directly connected, or the electrically opposite electrode tabs 21 on each adjacent bare cell parts 2 Direct connection, further, direct connection means that two electrode tabs 21 are electrically connected by welding or bonding.

Further, it also includes: S3. Encapsulating each bare electric core piece 2, specifically, step S3 includes: setting a number of packaging films that are made of flexible materials and correspondingly loading each bare electric core piece 2, specifically, the packaging film is Aluminum-plastic film 4, at this time, the packaging film is not closed, and an opening needs to be left; then inject electrolyte into the aluminum-plastic film 4 through the opening, and finally package the aluminum-plastic film 4 to close the opening.

After the bare electric core parts 2 are arranged, a single Tab piece 3 is provided between the opposite electrical lugs of adjacent bare electric core parts 2 to connect, or to connect directly. In this way, on the one hand, it is convenient for multiple tooling Install and install Tab piece 3 or connect adjacent tabs to improve production efficiency. On the other hand, compared with a single bare cell part 2, after installing Tab piece 3 on the positive and negative tabs, connect different bare cell parts 2 Tab piece 3, set in this way, reduce the usage of Tab piece 3, reduce cost, and reduce the space occupancy rate of Tab piece 3 and tab, as well as the average weight of a single cell and the weight of the total battery module, and improve the battery and module The energy density of the group is improved, and at the same time, the number of connections between tabs and tabs 3 is reduced, and the production efficiency of the module is improved.

Specifically, in this embodiment, step S1 includes:

S11. Set at least one set of bare cell arrays 1. In this embodiment, the pouch battery module includes multiple sets of bare cell arrays 1, and each set of bare cell arrays 1 includes several bare cell components 2. The bare cell parts 2 in the pouch battery module are arranged linearly. Preferably, the bare cell parts 2 in the same group are arranged in a straight line, one direction, and evenly spaced along the same direction. The multi-station synchronous connection of the electrode lugs 21 on each bare cell part 2 improves the production efficiency.

As an alternative embodiment, the pouch battery module may only include a single set of bare cell arrays 1, and each bare cell 2 in the same group may also be distributed in a non-linear or non-uniform interval.

S12. In this embodiment, the electrode lugs 21 of the adjacent bare cell parts 2 in the same group are closely adjacent to each other, and the distance between them is the length of a single Tab piece 3, which is convenient for passing A single Tab piece 3 realizes the connection of the electrode tab 21 .

As an alternative embodiment, the electrode lugs 21 of the adjacent bare cell parts 2 in the same group can be stacked and bonded together, so as to facilitate the direct connection between them.

S13. The bare cell part 2 at the end position of the bare cell row group 1, the electrode tab 21 at the edge position is defined as an edge tab, and the corresponding edge tab on the adjacent bare cell row group 1 is set Electricity is opposite. Such setting facilitates that different groups of bare cell arrays 1 can be connected end-to-end to achieve linear arrangement, and to achieve series connection through direct connection or Tab piece 3 connection.

Specifically, the position at the end of the bare cell row group 1 means that the structure in which several bare cell parts 2 are arranged linearly is at the first and last ends. The edge position refers to: the side of the bare cell parts 2 that has no adjacent bare cell parts 2 in the same group.

Further, in step S2, on the two adjacent bare cell parts 2 in the same group, between the two adjacent electrode tabs 21 with opposite electrical properties, a single Tab piece 3 is connected, and at the same time, on the edge On the tab, a single Tab piece 3 is connected and defined as an edge Tab piece 3 .

As an alternative embodiment, when the pouch battery module only includes a single set of bare cell arrays 1, the Tab piece 3 may not be provided on the edge tab, and it may be directly connected to the external circuit through the edge tab.

In addition, step S2 also includes:

A single Tab 3 is connected between two corresponding edge Tabs 3 on adjacent bare cell row groups 1 . As a convertible embodiment, two corresponding edge tabs 3 on the adjacent bare cell row group 1 are arranged integrally or connected to each other. Further, "integrated arrangement" specifically means that only a single edge tab 3 is provided, And connect two adjacent bare cell row groups 1.

When the adjacent bare cell row group 1 is connected by at least two Tab pieces 3, that is, a single Tab piece 3 is set between two edge Tab pieces 3, or two edge Tab pieces 3 are connected to each other. The adjacent bare cell rows 1 with long or relatively complicated positions are connected to improve the connection strength; when the adjacent bare cell rows 1 are connected through a single Tab piece 3, that is, when they are integrated, the cost can be effectively reduced. The space occupancy rate of Tab 3 and the average weight of a single cell increase the energy density of cells and modules.

Further, as a convertible implementation, the Tab sheet 3 is not provided in step S2, which specifically includes: on two adjacent bare cell components 2 in the same group, the two adjacent electrode lugs with opposite electrical properties 21 are directly connected, and the corresponding edge tabs of the adjacent bare cell rows 1 are directly connected with opposite electrical properties.

As another convertible embodiment, each bare cell in the pouch battery module is arranged in series, and the two electrode tabs between adjacent bare cells are respectively connected with a single tab piece, a plurality of tabs, etc. slices or no tab slices, the three cases are staggered.

In this embodiment, the bare electric core components 2 in the same group are evenly spaced and arranged. As an alternative embodiment, the intervals between the bare cell components 2 in different groups may also be set uniformly.

Preferably, the tab sheet 3 is connected to the electrode lug 21 of the bare cell 2 by welding, and the connection strength is high. As an alternative embodiment, the connection method may also be adhesive connection through conductive glue.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. However, the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (10)

1. The arrangement method of the soft package battery modules is characterized by comprising the following steps:

s1, arranging a plurality of bare cell parts (2);

s2, correspondingly arranging a single Tab sheet (3) between at least part of adjacent bare cell parts (2), wherein each Tab sheet (3) is respectively connected with electrode lugs (21) with opposite electrical properties on the adjacent bare cell parts (2);

or the like, or, alternatively,

directly connect to the electrode tabs (21) of opposite polarity on at least part of the adjacent bare cell elements (2).

2. The arranging method of the soft package battery module according to claim 1, wherein the step S1 comprises:

arranging at least one group of naked battery cell row groups (1);

arranging adjacent naked electric core pieces (2) in the same group, and enabling electrode lugs (21) on one sides, opposite in electric property, of the adjacent naked electric core pieces (20) to be opposite and adjacent;

to naked electric core piece (2) of the tip position department of group (1) is arranged to naked electric core, the electrode utmost point ear of defining its marginal position is marginal utmost point ear, arranges adjacent naked electric core and arranges group (1), makes corresponding marginal utmost point ear electric property opposite on adjacent naked electric core arranges group (1).

3. The arranging method of the soft package battery module according to claim 2, wherein the step S2 comprises:

a single Tab sheet (3) is connected and arranged between two adjacent electrode tabs (21) with opposite electrical properties on two adjacent naked electric core pieces (2) in the same group;

on the edge tabs, a single Tab sheet (3) is provided in connection and is defined as an edge Tab sheet (3).

4. The arrangement method of the soft package battery modules according to claim 3, wherein the step S2 further comprises:

a single Tab sheet (3) is connected between two corresponding edge Tab sheets (3) on adjacent naked battery cell row groups (1);

or the like, or, alternatively,

two corresponding edge Tab sheets (3) on the adjacent naked electric core row group (1) are integrally arranged.

5. The arrangement method of the soft package battery modules according to claim 2, wherein the step S2 further comprises:

on two adjacent naked electric core pieces (2) in the same group, two electrode tabs (21) with opposite electric properties which are adjacent to the naked electric core pieces are directly connected;

the corresponding edge tabs with opposite electric properties on the adjacent naked electric core row group (1) are directly connected.

6. The arranging method of the soft package battery module according to any one of claims 2 to 5, wherein at least the bare cell elements (2) in the same group are uniformly distributed at intervals.

7. The arrangement method of the soft-package battery module according to any one of claims 1 to 5, characterized in that the Tab sheets (3) are made of nickel, aluminum or copper.

8. The arrangement method of the soft package battery module according to any one of claims 1 to 5, characterized in that the Tab sheets (3) are respectively welded with electrode tabs (21) of the bare cell element (2).

9. The arrangement method of the soft package battery module according to any one of claims 1 to 5, further comprising: and S3, packaging each bare cell element (2).

10. The arrangement method of the soft package battery modules according to claim 9, wherein the step S3 comprises:

s31, arranging a plurality of aluminum-plastic films (4) into which the bare cell parts (2) are correspondingly arranged;

s32, injecting an electrolyte into the aluminum-plastic film (4);

s33, packaging the aluminum-plastic film (4).

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