CN220330197U - Auxiliary welding tool for battery module - Google Patents

Abstract

The utility model discloses an auxiliary welding tool for a battery module, which comprises a module positioning device and a welding extrusion module; the module positioning device is used for positioning the battery module; the module positioning device is arranged at a position right above the battery module and is provided with a welding extrusion module; the welding extrusion module is used for extruding and positioning an object to be welded, and specifically comprises the following steps: and extruding and positioning the lugs at the top of the battery module, the copper strips on the plastic support and the nickel sheets on the FPC before welding. The auxiliary welding tool for the battery module disclosed by the utility model is scientific in design, can accurately and reliably position an object to be welded in the battery module (particularly a soft package battery module), and then performs welding operation through the existing laser welding equipment positioned outside, thereby being beneficial to remarkably improving the working efficiency of welding and ensuring the welding quality.

Description

Auxiliary welding tool for battery module

Technical Field

The utility model relates to the technical field of welding of battery modules, in particular to an auxiliary welding tool for a battery module, which is applied to a welding procedure of a soft package battery module.

Background

The lithium ion battery has the advantages of high specific energy, multiple recycling times, long storage time and the like, and is widely applied to portable electronic equipment (such as mobile phones, digital cameras and portable computers) and large and medium-sized electric equipment such as electric automobiles, electric bicycles, electric tools and the like.

At present, for a soft package battery module, welding operation of an FPC (i.e., a flexible circuit board) and a tab is required. The existing welding modes are generally as follows: firstly welding an FPC assembly (the specific welding requirements are that a total positive nickel piece, a total negative nickel piece and a middle nickel piece on a flexible circuit board FPC are welded to an embedded copper bar of a plastic bracket right below the flexible circuit board FPC, so that the FPC assembly is formed), then welding tabs (the specific welding requirements are that the tabs at the top of each single battery cell in a battery cell module are welded to the embedded copper bar of the plastic bracket), and the conventional welding mode is adopted to carry out multiple positioning and then carry out multiple welding operations, so that the welding work efficiency is lower, and the overall production efficiency of the soft package battery module is influenced.

The flexible circuit board FPC is composed of a Printed Circuit Board (PCB), an intermediate nickel plate, a total positive nickel plate and a total negative nickel plate, wherein one end of the intermediate nickel plate, one end of the total positive nickel plate and one end of the total negative nickel plate are welded on the Printed Circuit Board (PCB), and the other end of the total positive nickel plate and one end of the total negative nickel plate are connected (welded) with the collection points, so that the flexible circuit board FPC has a collection function.

Therefore, there is an urgent need to develop a technology capable of solving the above technical problems.

Disclosure of Invention

The utility model aims at solving the technical defects existing in the prior art and provides an auxiliary welding tool for a battery module.

Therefore, the utility model provides an auxiliary welding tool for a battery module, which comprises a module positioning device and a welding extrusion module;

the module positioning device is used for positioning the battery module;

the module positioning device is arranged at a position right above the battery module and is provided with a welding extrusion module 3;

the welding extrusion module is used for extruding and positioning an object to be welded, and specifically comprises the following steps: and extruding and positioning the lugs at the top of the battery module, the copper strips on the plastic support and the nickel sheets on the flexible circuit board before welding.

Compared with the prior art, the technical scheme provided by the utility model provides the auxiliary welding tool for the battery module, which is scientific in design, can accurately and reliably position the object to be welded in the battery module (particularly the soft package battery module), and then performs welding operation through the external and existing laser welding equipment, thereby being beneficial to remarkably improving the welding work efficiency, ensuring the welding quality and having great practical significance.

Drawings

Fig. 1 is a schematic perspective view of an auxiliary welding tool for a battery module according to the present utility model;

fig. 2 is a schematic structural diagram of a battery module (specifically, a soft package battery module) in the auxiliary welding fixture for a battery module provided by the utility model;

fig. 3 is a schematic structural diagram of a module positioning device in the auxiliary welding tool for battery modules provided by the utility model;

fig. 4 is an enlarged schematic view of a three-dimensional structure of a plastic bracket in the welding auxiliary tool for a soft package battery module provided by the utility model;

fig. 5 is an enlarged schematic view of a three-dimensional structure of a flexible circuit board (FPC) in the welding auxiliary tool for a soft pack battery module provided by the utility model;

fig. 6 is a schematic structural diagram of a welding extrusion module in the welding auxiliary tool for a soft package battery module provided by the utility model;

fig. 7 is an enlarged schematic view of a middle area of a welding extrusion module in the welding auxiliary tool for a soft package battery module provided by the utility model;

fig. 8 is an enlarged schematic view of a three-dimensional structure of a tab welding press head of a welding extrusion module in the welding auxiliary tool for a soft package battery module provided by the utility model;

fig. 9 is an enlarged schematic view of a three-dimensional structure of a nickel plate welding press head of a welding extrusion module in the welding auxiliary tool for a soft package battery module provided by the utility model;

fig. 10 is an enlarged schematic view of a three-dimensional structure of a welding press head for welding positive and negative nickel plates of a welding extrusion module in the welding auxiliary tool for a soft package battery module provided by the utility model;

fig. 11 is a schematic diagram of a working state of a welding auxiliary tool for a soft package battery module provided by the utility model when the battery module is placed in the welding tool.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of this patent, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "disposed" are to be construed broadly, and may be fixedly connected, disposed, detachably connected, disposed, or integrally connected, disposed, for example. The specific meaning of the terms in this patent will be understood by those of ordinary skill in the art as the case may be.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1 to 11, the utility model provides an auxiliary welding tool for a battery module, which comprises a module positioning device 2 and a welding extrusion module 3;

a module positioning device 2 for positioning the battery module 1 (e.g., a soft pack battery module);

the module positioning device 2 is arranged at a position right above the battery module 1 and is provided with a welding extrusion module 3;

the welding extrusion module 3 is used for extruding and positioning an object to be welded, and specifically comprises the following steps: extruding and positioning the electrode lug at the top of the battery module 1, copper strips (particularly a middle copper strip 40, a total positive copper strip 41 and a total negative copper strip 42) on the plastic bracket 4 and a plurality of nickel sheets (particularly comprising a middle nickel sheet 50, a total positive nickel sheet 51 and a total negative nickel sheet 52) on the flexible circuit board FPC5 before welding;

in the present utility model, as shown in fig. 2, a battery module 1 (e.g., a soft pack battery module) includes a battery module lower case, a plastic holder 4, a flexible circuit board (FPC) 5, and a battery cell module 6,

A battery cell module 6 is arranged in the hollow battery module lower shell with an opening at the top;

two ends of the top of each single battery cell in the battery cell module 6 are respectively provided with a tab;

the top of the lower shell of the battery module is provided with a plastic bracket 4;

a flexible circuit board (FPC) 5 is arranged above the plastic bracket 4;

in the present utility model, referring to fig. 5, a flexible circuit board FPC5, including a Printed Circuit Board (PCB) 53;

a plurality of middle nickel plates 50 are arranged at intervals on the front side and the rear side of a Printed Circuit Board (PCB) 53;

the left and right ends of a Printed Circuit Board (PCB) 53 are provided with a total positive nickel sheet 51 and a total negative nickel sheet 52, respectively.

It should be noted that, referring to fig. 5, the flexible circuit board FPC5 is composed of a Printed Circuit Board (PCB) 53 and an intermediate nickel plate 50, a total positive nickel plate 51 and a total negative nickel plate 52, wherein one ends of the intermediate nickel plate, the total positive nickel plate and the total negative nickel plate are soldered on the Printed Circuit Board (PCB), and the other ends are used for connection (soldering) with the collection points, whereby the flexible circuit board FPC has the collection function.

A Flexible Printed Circuit (FPC) is one of the battery module components, and functions to collect the battery voltage and temperature. The Printed Circuit Board (PCB) is one of flexible circuit board (FPC) components and is used for transmitting battery voltage and temperature information to the plug-in port through etched circuits in the circuit board, and the information is equivalent to a plurality of connecting wires.

In the present utility model, in particular implementation, a plurality of copper bars (in particular, an intermediate copper bar 40, a total positive copper bar 41 and a total negative copper bar 42 thereon) are embedded in the openings of the plastic bracket 4; the method comprises the following steps:

the plastic bracket 4 is provided with a plurality of middle copper bars 40 which are distributed at intervals in an embedded way (the outer side of the bottom surface and the top surface of the middle copper bars 40 are exposed);

the middle copper bar 40 is arranged opposite to the middle nickel sheet 50 on the flexible circuit board FPC 5;

the plastic bracket 4 is provided with a total positive copper bar 41 and a total negative copper bar 42 (both the bottom surface outer sides and the top surfaces of the total positive copper bar 41 and the total negative copper bar 42 are exposed) at positions corresponding to the total positive nickel piece 51 and the total negative nickel piece 52 on the flexible circuit board FPC5, respectively.

In the present utility model, in a specific implementation, the cell module 6 includes a plurality of unit cells that are vertically distributed and the tabs are located at the top, that is, a plurality of unit cells are vertically stacked to form the cell module 6.

The battery module lower shell comprises a shell 7 and a cover plate 8;

the cover plate 8 is fixedly connected (specifically, clamped) with the left ends of the front side and the rear side of the shell 7.

Further, a plurality of clamping convex blocks are respectively arranged at the front end and the rear end of the left side of the shell 7;

the right side of the cover plate 8 is provided with a clamping groove at a position corresponding to each clamping convex block;

the clamping convex blocks are correspondingly clamped with the clamping grooves.

In particular, a flexible circuit board (FPC) 5 is placed on the plastic carrier 4, and the two are combined into an FPC assembly 9.

The plastic bracket 4 in the FPC assembly 9 is fastened and fixed to the housing 7 and the cover plate 8.

In the present utility model, referring to fig. 3, the module positioning device 2 includes a device base 200;

the top of the device base 200 is provided with left slide rails 17 and right slide rails 18 which are longitudinally distributed at left and right intervals;

the tops of the left slide rail 17 and the right slide rail 18 are respectively provided with a sliding bottom bracket 13 (i.e. a sliding block) which can longitudinally slide back and forth;

the top parts of the two sliding bottom brackets 13 are fixedly connected with the bottom of the bottom tray 16;

the top of the bottom tray 16 is provided with a battery module receiving recess 160;

the battery module receiving recess 160 is provided for receiving the bottom of the battery module 1.

It should be noted that, the bottom tray 16 is used as a placement platform of the battery module 1, so as to facilitate the battery module to be taken in the welding fixture.

It should be noted that, the left slide rail 17 and the right slide rail 18 are all linear slide rails (guide rails) mature in the prior art. The sliding shoe 13 is a sliding block on the left sliding rail 17 and the right sliding rail 18, and can only slide back and forth.

In particular, the top of the device base 200 is arranged at the left upper part and the right upper part of the bottom tray 16, and is respectively provided with a left limiting plate 10 and a right limiting plate 11;

a transverse gap between the left limiting plate 10 and the right limiting plate 11 is used for placing the battery module 1;

the rear sides of the left limiting plate 10 and the right limiting plate 11 are fixedly connected with the left end and the right end of the front side of the rear limiting plate 12;

the area surrounded by the left limiting plate 10, the right limiting plate 11 and the rear limiting plate 12 is used for accommodating the plastic bracket 4 at the top of the battery module 1 (namely, the plastic bracket 4 in the FPC assembly 9);

further, the right side of the left limiting plate 10 is in propping contact with the left side of the plastic bracket 4;

the left side of the right limiting plate 11 is tightly propped against the right side of the plastic bracket 4;

the front side of the rear limiting plate 12 is in propping contact with the rear side of the plastic bracket 4;

further, the left limiting plate 10 and the right limiting plate 11 are symmetrically distributed.

It should be noted that, referring to fig. 11, after the left limiting plate 10, the right limiting plate 11 and the rear limiting plate 12 are connected together, the plastic bracket 4 in the FPC assembly 9 above the soft package battery module 1 can be directly positioned, so as to ensure the welding positioning accuracy of the battery module 1.

In particular, the top of the device base 200 is provided with a left cylinder 14 and a right cylinder 15 on the left side and the right side of the bottom tray 16 respectively;

the left limiting plate 10 and the right limiting plate 11 are respectively arranged at the top of the cylinder shell of the left cylinder 14 and the right cylinder 15;

the left limiting plate 10 and the right limiting plate 11 are respectively provided with a vertically penetrating notch at the positions corresponding to the output ends (i.e. piston rods) at the tops of the left cylinder 14 and the right cylinder 15;

the output ends of the tops of the left cylinder 14 and the right cylinder 15 are fixedly connected with the left and right ends of the bottom of the welding extrusion module 3 (specifically with the left and right ends of the bottom of the horizontal support plate 30 in the welding extrusion module 3) after penetrating through the openings on the left limiting plate 10 and the right limiting plate 11 respectively

In the present utility model, referring to fig. 6, the welding extrusion module 3 includes a horizontal support plate 30 horizontally distributed;

a welding pressing plate 22 is arranged at the transverse middle position of the bottom of the horizontal supporting plate 30;

the front and rear sides of a Printed Circuit Board (PCB) 53 in a flexible circuit board (FPC) 5 are provided with a plurality of intermediate nickel sheets 50 at intervals;

a nickel sheet welding press head 20 is respectively provided at the bottom of the welding press plate 22 at a position corresponding to (i.e., directly above) each of the intermediate nickel sheets 50 on the flexible circuit board (FPC) 5;

a tab welding press head 19 is respectively arranged at the bottom of the welding press plate 22 at a position corresponding to each tab at the top of the battery module;

the left and right ends of the flexible circuit board (FPC) 5 are respectively provided with a total positive nickel sheet 51 and a total negative nickel sheet 52;

a total positive and negative nickel sheet welding press head 21 (specifically including a total positive nickel sheet welding press head and a total negative nickel sheet welding press head) is provided at the bottom of the welding press plate 22 at positions corresponding to the total positive nickel sheet 51 and the total negative nickel sheet 52 on the flexible circuit board (FPC) 5;

in the utility model, two total positive and negative nickel sheet welding press heads 21 (namely, one total positive nickel sheet welding press head and one total negative nickel sheet welding press head) are respectively used for pressing the total positive nickel sheet 51 and the total negative nickel sheet 52 on the flexible circuit board FPC5, and the total positive copper bar 41 and the total negative copper bar 42 are correspondingly pressed on two sides of the plastic bracket in the FPC assembly 9;

the tab welding press head 19 is configured to press the tabs (specifically, the tabs with different polarities on the adjacent series-connected battery cells) on the adjacent series-connected battery cells (except for the total positive and total negative tabs), for example, for three battery cells, such as a first battery cell, a second battery cell, and a third battery cell, which are connected in series, the positive tab of the second battery cell is connected with the negative tab of the first battery cell, the negative tab of the second battery cell is connected with the positive tab of the third battery cell, that is, the positive tab and the negative tab of any one battery cell are respectively connected with the negative tab and the positive tab of the adjacent two battery cells, with the middle copper bar 40 on the plastic support in the FPC assembly;

the nickel sheet welding press head 20 is used for pressing the middle nickel sheet 50 on the flexible circuit board FPC5 together with the negative electrode tab (except the total negative electrode tab, in addition, the positive electrode tab needs to be cut into small gaps so as to be convenient for being connected with the negative electrode tab folding on the adjacent battery cell) of the battery cell and the middle copper bar 40 on the plastic support 4 in the FPC assembly;

and the total positive lug welding pressure head 191 and the total negative lug welding pressure head 192 which are positioned on the left side and the right side of the welding pressure plate 22 are used for pressing the total positive lug and the total negative lug of the module with the total positive copper bar and the total negative copper bar on the FPC assembly.

It should be noted that, the flexible circuit board (FPC) 5 is connected with the battery module together through a plurality of nickel sheets thereon, and each cell voltage, temperature data in the battery module is transferred to the FPC plug-in port through the nickel sheet, and then further transferred to the external data acquisition device.

In particular, the top of the device base 200 is provided with a guide post 201 at the front end and the rear end of the left cylinder 14 and the right cylinder 15 respectively;

a horizontal support plate 30 provided with guide post through holes 301 vertically penetrating at positions corresponding to each guide post 201;

a guide post through hole 301 vertically penetrating the guide post 201;

further, the guide post 201 is provided with a stopper 202 at a position above the guide post through hole 301;

the size of the stopper 202 is larger than the size of the guide post through hole 301;

the stop 202 is located above the horizontal support plate 30.

The welding extrusion module 3 is a split welding ram module, and includes a tab welding ram 19, a nickel sheet welding ram 20, and various welding rams such as a total positive tab welding ram 191, a total negative tab welding ram 192, a total positive and negative nickel sheet welding ram 21.

The tab welding ram 19 and the nickel tab welding ram 20 are diagonally fixed and diagonally opposite.

After the fixing positions of the various welding pressure heads on the welding pressure plate 22 are determined, the placing direction of the battery module 1 in the welding tool is also determined, and the direction of the battery module is consistent with the direction of the total positive and negative nickel sheet welding pressure heads 21.

It should be noted that, for the tab welding press 19, the nickel sheet welding press 20, the total positive and negative nickel sheet welding press 21, the total positive tab welding press 191, the total negative tab welding press 192, and the like, they all have vertically penetrating through holes, so that laser emitted from the welding head of the existing laser welding apparatus can pass from top to bottom, thereby performing welding operation on the corresponding nickel sheet, copper bar, and tab.

In the present utility model, the objects to be welded by the laser welding device in the prior art are the middle nickel sheet, the total positive nickel sheet, the total negative nickel sheet and the battery tab on the FPC assembly, and the middle copper bar 40, the total positive copper bar 41 and the total negative copper bar 42 on the plastic bracket 4.

The total positive nickel piece 51 and the total negative nickel piece 52 on the flexible circuit board FPC are respectively pressed and welded with the total positive copper bar 41 and the total negative copper bar 42 on two sides of the plastic bracket in the FPC component positioned under the two positive nickel piece welding pressure heads 21 (namely, the total positive nickel piece welding pressure head and the total negative nickel piece welding pressure head are included);

the positive electrode tab (positive electrode tab except the total positive electrode tab) of the battery cell is folded together with the adjacent battery cell negative electrode tab connected in series (wherein, the battery cell module is in a serial connection mode, namely, a plurality of battery cells are sequentially connected in series, namely, the positive electrode tab of the first battery cell is a module total positive electrode tab, the negative electrode tab of the first battery cell is folded and connected with the positive electrode tab of the adjacent second battery cell, the second battery cell negative electrode tab is folded and connected with the third battery cell positive electrode tab … … in a serial connection mode, the last battery cell negative electrode tab is folded and connected with the last battery cell positive electrode tab, the last battery cell negative electrode tab is the module total negative electrode tab, the positive electrode tab is positioned above the negative electrode tab), the battery cell positive electrode tab and the negative electrode tab are pressed through a plurality of electrode tab welding pressure heads 19, and then are welded and connected with the middle copper bars 40 arranged on plastic supports in FPC assemblies corresponding to the adjacent battery cells connected in series through the existing laser welding equipment;

the middle nickel plate 50 on the flexible circuit board FPC is arranged on a cell negative electrode lug (a negative electrode lug except the total negative electrode lug) in a battery module, a small notch is needed to be cut on a positive electrode lug, the positive electrode lug is convenient to be folded and connected with a negative electrode lug on an adjacent cell, then the nickel plate is welded with a pressure head 20, then the nickel plate is pressed with a middle copper bar which corresponds to the position and is arranged on a plastic support in the FPC assembly, and then the middle nickel plate is welded and connected with the negative electrode lug (the negative electrode lug except the total negative electrode lug) through the existing laser welding equipment;

in addition, the total positive and negative lugs of the battery module are respectively pressed and welded with the total positive and negative copper bars on the plastic bracket in the FPC assembly corresponding to the positions by the total positive lug welding press head 191 and the total negative lug welding press head 192 which are positioned at the left side and the right side of the welding press plate 22.

In order to more clearly understand the technical scheme of the present utility model, the working process of the present utility model is described below.

First, the battery module 1 is placed on the slide shoe 13 (this process is called a placing process of the battery module 1 on a fixture), and the placing direction is kept identical to the fixing direction of the various welding press heads on the welding press module 3.

Then, the sliding shoe 13 is slid into the fixture, and the welding press plate 22 is in a raised state, so that the battery module 1 contacts the left limiting plate 10, the right limiting plate 11 and the rear limiting plate 12, and the FPC assembly 9 of the battery module 1 (specifically, the plastic bracket 4 in the FPC assembly 9 is positioned through the left limiting plate 10, the right limiting plate 11 and the rear limiting plate 12, which is called as a positioning process of the battery module 1) is positioned.

Then, the switch of the cylinder is toggled again, the two cylinders drive the welding pressing plates 22 to move downwards, the welding pressing plates 22 are placed down, various welding pressure heads on the welding extrusion module 3 respectively extrude and fix the electrode lugs, the copper bars and the corresponding nickel plates, namely, the welding area is pressed down and fixed, so that the welding positioning (the process is called as the welding positioning process of the battery module 1) is finished, and the welding operation of the battery module can be finished through the external and existing laser welding equipment.

The battery module 1 performs three-face positioning through the FPC assembly 9, so that the positioning accuracy of the battery module 1 is guaranteed, and a good foundation is laid for subsequent welding positioning. The electrode lugs and the nickel sheets of the battery module 1 can be welded at one time through the external and existing laser welding equipment, and the electrode lugs and the nickel sheets are respectively welded and positioned, so that the welding efficiency and the welding quality are remarkably improved.

In particular, the external and existing laser welding equipment is mature equipment in the prior art, for example, a 2000W laser welder manufactured by the company of the major laser technology industry group, is used for carrying out laser welding treatment on the electrode lugs of the battery module and the nickel plates on the flexible circuit board, so that the battery cores of the battery module and the battery are connected with the flexible circuit board.

By applying the utility model, when one battery module needs to be welded, all welding operations can be finished through the laser welding equipment after only one welding positioning, and particularly, the welding can be finished by writing one welding program on the laser welding equipment.

The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Claims (10)

1. The auxiliary welding tool for the battery module is characterized by comprising a module positioning device (2) and a welding extrusion module (3);

the module positioning device (2) is used for positioning the battery module (1);

the module positioning device (2) is provided with a welding extrusion module (3) at a position right above the battery module (1);

the welding extrusion module (3) is used for extruding and positioning an object to be welded, and specifically comprises the following steps: the electrode lugs at the top of the battery module (1), the copper strips on the plastic bracket (4) and the nickel sheets on the flexible circuit board (5) are extruded and positioned before welding.

2. The auxiliary welding fixture for battery modules according to claim 1, wherein the battery module (1) comprises a lower housing of the battery module, a plastic bracket (4), a flexible circuit board (5) and an electric core module (6),

A battery core module (6) is arranged in the hollow battery module lower shell with the top opening;

two ends of the top of each single battery cell in the battery cell module (6) are respectively provided with a tab;

a plastic bracket (4) is arranged at the top of the lower shell of the battery module;

a flexible circuit board (5) is arranged above the plastic bracket (4).

3. The auxiliary welding fixture for the battery module according to claim 1 or 2, wherein the battery cell module (6) comprises a plurality of single battery cells which are vertically distributed and the lugs of which are positioned at the top;

a flexible wiring board (5) including a printed wiring board (53);

a plurality of middle nickel plates (50) are arranged on the front side and the rear side of the printed circuit board (53) at intervals;

the left and right ends of the printed circuit board (53) are respectively provided with a total positive nickel sheet (51) and a total negative nickel sheet (52).

4. A welding auxiliary tool for a battery module according to claim 3, wherein a plurality of middle copper bars (40) which are distributed at intervals are embedded in the opening of the plastic bracket (4);

the middle copper bar (40) is arranged opposite to the middle nickel sheet (50) on the flexible circuit board (5);

the plastic bracket (4) is provided with a total positive copper bar (41) and a total negative copper bar (42) at positions corresponding to the total positive nickel sheet (51) and the total negative nickel sheet (52) on the flexible circuit board (5).

5. The welding auxiliary tool for the battery module according to claim 2, wherein the lower housing of the battery module comprises a housing (7) and a cover plate (8);

the cover plate (8) is fixedly connected with the left ends of the front side and the rear side of the shell (7);

the front end and the rear end of the left side of the shell (7) are respectively provided with a plurality of clamping convex blocks;

the right side of the cover plate (8) is provided with clamping grooves at positions corresponding to the clamping convex blocks respectively;

the clamping convex blocks are correspondingly clamped with the clamping grooves.

6. The battery module welding auxiliary fixture according to any one of claims 1 to 5, wherein the module positioning device (2) includes a device base (200);

the top of the device base (200) is provided with left sliding rails (17) and right sliding rails (18) which are longitudinally distributed at intervals left and right;

the tops of the left sliding rail (17) and the right sliding rail (18) are respectively provided with a sliding bottom bracket (13) which can longitudinally slide forwards and backwards;

the tops of the two sliding bottom brackets (13) are fixedly connected with the bottom of the bottom tray (16);

the top of the bottom tray (16) is provided with a battery module accommodating groove (160);

and a battery module accommodating groove (160) for placing the bottom of the battery module (1).

7. The auxiliary welding fixture for the battery module according to claim 6, wherein the top of the device base (200) is arranged at the left upper part and the right upper part of the bottom tray (16) and is provided with a left limiting plate (10) and a right limiting plate (11) respectively;

a transverse gap between the left limiting plate (10) and the right limiting plate (11) is used for placing the battery module (1);

the rear sides of the left limiting plate (10) and the right limiting plate (11) are fixedly connected with the left end and the right end of the front side of the rear limiting plate (12);

the area surrounded by the left limiting plate (10), the right limiting plate (11) and the rear limiting plate (12) is used for accommodating a plastic bracket (4) at the top of the battery module (1);

the right side of the left limiting plate (10) is tightly propped against the left side of the plastic bracket (4);

the left side of the right limiting plate (11) is tightly propped against the right side of the plastic bracket (4);

the front side of the rear limiting plate (12) is in propping contact with the rear side of the plastic bracket (4);

the left limiting plate (10) and the right limiting plate (11) are distributed symmetrically left and right.

8. The auxiliary welding fixture for the battery module according to claim 7, wherein the top of the device base (200) is provided with a left cylinder (14) and a right cylinder (15) on the left side and the right side of the bottom tray (16) respectively;

the left limiting plate (10) and the right limiting plate (11) are respectively arranged at the tops of cylinder shells of the left cylinder (14) and the right cylinder (15);

the left limiting plate (10) and the right limiting plate (11) are respectively provided with a vertically penetrating notch at positions corresponding to the output ends at the tops of the left cylinder (14) and the right cylinder (15);

the output ends of the tops of the left cylinder (14) and the right cylinder (15) respectively pass through the openings on the left limiting plate (10) and the right limiting plate (11) and are fixedly connected with the left end and the right end of the bottom of the horizontal supporting plate (30) in the welding extrusion module (3).

9. The auxiliary welding fixture for the battery module according to claim 8, wherein the welding extrusion module (3) comprises a horizontal supporting plate (30) which is horizontally distributed;

a welding pressing plate (22) is arranged at the transverse middle position of the bottom of the horizontal supporting plate (30);

the bottom of the welding pressing plate (22) is provided with a nickel sheet welding pressing head (20) at a position corresponding to each middle nickel sheet (50) on the flexible circuit board (5);

a lug welding press head (19) is respectively arranged at the bottom of the welding press plate (22) at the position corresponding to each lug at the top of the battery module;

the bottom of the welding pressing plate (22) is provided with a total positive and negative nickel sheet welding pressure head (21) at positions corresponding to a total positive nickel sheet (51) and a total negative nickel sheet (52) on the flexible circuit board (5).

10. The auxiliary welding fixture for the battery module according to claim 9, wherein the top of the device base (200) is provided with a guide post (201) at the front end and the rear end of the left cylinder (14) and the right cylinder (15) respectively;

a horizontal support plate (30) provided with a guide post through hole (301) that vertically penetrates at a position corresponding to each guide post (201);

the guide post through hole (301) vertically penetrates through the guide post (201).