Positioning device for electric connection of soft package battery module and electric connection method

Abstract

The invention discloses a positioning device for electric connection of a soft package battery module and an electric connection method.The positioning device comprises a plurality of square single replacement plates and a bottom support, an operation step is fixed to one end of the surface of the bottom support, a pair of clamping plates is arranged at the other end of the surface of the bottom support, and the square single replacement plates are just placed in the distance between the pair of clamping plates; the vertical edges of the pair of clamping plates abut against the operation step, the operation step located between the pair of clamping plates is provided with a containing space used for inserting a pole lug, the top of the containing space is provided with a welding bottom plate, the welding bottom plate is provided with a bottom plate groove, and the operation step is vertically provided with a pair of linear bearings and a toggle clamp. A welding pressing plate located above the welding bottom plate is installed on the pair of linear bearings and the toggle clamp, a welding long groove is formed in the welding pressing plate, and the welding pressing plate is controlled by the toggle clamp to move up and down along the pair of linear bearings, so that the welding pressing plate is pressed on the welding pressing plate. The module electric connection process method is simplified, the yield is improved, and the assembly efficiency is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrical connection of soft-pack battery modules, and in particular relates to a positioning device and an electrical connection method for electrical connection of soft-pack battery modules. Background Art

[0002] Soft-pack battery modules are widely used in various electronic devices and energy storage systems due to their high energy density and simple structure. In the assembly of soft-pack battery modules, it is necessary to connect the individual soft-pack cells in series and parallel to perform electrical performance cycles and form modules. Currently, two methods are used: one is bolt electrical connection, in which holes are punched and bent at the positive and negative ears of the soft-pack cells, and bolts, nuts, flat washers, etc. are used to make corresponding electrical connections; the other is laser welding, in which a copper plate is used as the base plate, the positive and negative ears of the soft-pack cells are bent, and welded to the conductive copper plate for electrical connection.

[0003] However, the existing technology has defects and shortcomings. First, the positive and negative ears of the soft-pack single battery need to be pre-processed, which adds an additional production process, and the pre-processing method is not accurately positioned, which will lead to large positioning errors in the subsequent electrical connections; second, the positive and negative ears of the soft-pack single battery need to be bent, which causes stress on the roots of the ears, easily damaging the battery, and is not conducive to the mechanical environment requirements of the battery; third, a variety of parts are required for assembly, which increases the weight of the battery module, increases the cost, and is not conducive to the improvement of the module's specific energy. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a positioning device and an electrical connection method for the electrical connection of a soft-pack battery module, which simplifies the module electrical connection process method, improves the yield rate and high assembly efficiency.

[0005] The present invention is implemented as follows: a positioning device for electrical connection of a soft-pack battery module comprises a plurality of square monomer replacement plates and a base, an operating step being fixed at one end on the surface of the base, and a pair of parallel and perpendicular clamping plates being arranged at the other end, the vertical sides of the pair of clamping plates being pressed against the operating step, the distance between the pair of clamping plates being just enough to accommodate the square monomer replacement plate, an accommodating space for inserting the pole ear being provided on the operating step between the pair of clamping plates, a welding base plate being provided at the top of the accommodating space, a base plate groove being provided on the welding base plate, a pair of linear bearings and an elbow clamp being vertically provided on the operating step, a welding pressure plate located above the welding base plate being installed on a pair of linear bearings and the elbow clamp, a welding long groove being provided on the welding pressure plate, the welding pressure plate being controlled to move up and down along the pair of linear bearings by the elbow clamp so that the welding pressure plate is pressed against the welding pressure plate.

[0006] A concave groove with an open top is formed in the middle of the card board, and the concave groove facilitates taking and placing of a single-cell replacement plate or a soft-pack single-cell battery placed between a pair of card boards.

[0007] The outer surface of the single replacement board is smooth and flat without defects or sharp edges, and is made of bakelite material.

[0008] The bottom bracket is made of bakelite material.

[0009] The welding bottom plate is made of copper material, and the size of the bottom plate groove processed in the middle is the welding area; the welding pressure plate is made of copper material, and the size of the welding long groove processed in the middle is the welding area.

[0010] The electrical connection method using the above-mentioned positioning device for electrical connection of a soft-pack battery module comprises the following steps in sequence:

[0011] (1) First, place the single replacement board between a pair of clamps on the bottom bracket of the welding positioning device. The number is the number of module series and parallel design minus 2;

[0012] (2) Prepare two soft-pack single cells and insulate the tab on the end that does not need to be welded temporarily;

[0013] (3) Place the two soft-pack single cells that need to be connected in series and parallel on the single cell replacement plate, place the tabs on the welding base plate, confirm the tab welding position, and place the elbow clamp so that the welding pressure plate is pressed tightly on the tabs;

[0014] (4) Place the welding positioning device at the laser welding machine station and adjust the laser beam for welding;

[0015] (5) After welding is completed, take out a single cell replacement plate, turn over the two soft-pack single cells, place the unwelded end tab on the welding base plate, and stack a new soft-pack single cell on top, extend the tab of the bottom single cell into the accommodation space under the welding base plate, confirm the tab welding position of the two upper single cells, and place the elbow clamp to press the welding plate against the tab;

[0016] (6) Repeat step (4) welding, and then repeat step (5) to start the cycle until the battery module is electrically connected in series and parallel.

[0017] The advantages and technical effects of the present invention are as follows: simplifying the module electrical connection process method, improving assembly efficiency, and enhancing the effectiveness of electrical connection; avoiding damage caused by bending of the soft-pack battery tabs, improving the yield rate, optimizing the battery module structure, and improving the module mechanical properties; reducing the number of auxiliary components, reducing the module structure weight, and effectively improving the specific energy of the soft-pack battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of a positioning device for electrical connection of a soft-pack battery module of the present invention.

[0019] Figure 2It is a structural diagram of a single-cell replacement plate in a positioning device for electrical connection of a soft-pack battery module of the present invention.

[0020] Figure 3 This is a usage status diagram of the positioning device for electrical connection of a soft-pack battery module of the present invention.

[0021] Figure 4 This is a cross-sectional view of the welding process in step (4) of the positioning device for electrical connection of a soft-pack battery module according to the present invention.

[0022] Figure 5 This is a cross-sectional view of the welding process in step (5) of the positioning device for electrical connection of a soft-pack battery module according to the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by terms such as “upper”, “middle”, “lower”, “inside”, “outside”, and “both sides” are based on the orientations or positional relationships shown in the accompanying drawings, and are only simplified descriptions for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] like Figure 1 , 2As shown, the positioning device for electrical connection of a soft-pack battery module of the present invention comprises a plurality of square monomer replacement plates 10 and a base 1. An operating step 2 is fixed at one end of the surface of the base 1, and a pair of parallel card plates 3 perpendicular to the surface of the base 1 are arranged at the other end. The vertical sides of the pair of card plates 3 are against the operating step 2, and the distance between the pair of card plates 3 is just enough to fit the square monomer replacement plate 10. An accommodating space 4 for inserting a pole ear is provided on the operating step 2 between the pair of card plates 3, a welding base plate 5 is provided at the top of the accommodating space 4, a base plate groove 6 is provided on the welding base plate 5, a pair of linear bearings 7 and an elbow clamp 11 are vertically provided on the operating step 2, a welding pressure plate 8 located above the welding base plate 5 is installed on the pair of linear bearings 7 and the elbow clamp 11, a welding long groove 9 is provided on the welding pressure plate 8, and the welding pressure plate 8 is controlled to move up and down along the pair of linear bearings 7 by the elbow clamp 11, so that the welding pressure plate 8 is pressed on the welding pressure plate 8.

[0027] A concave groove 12 with an open top is formed in the middle of the card board 3 , and the concave groove 12 is convenient for taking and placing the single-cell replacement board 10 or the soft-pack single-cell battery 13 placed between a pair of card boards 3 .

[0028] The outer surface of the single replacement plate 10 is smooth and flat without defects or sharp points, and is made of bakelite. The bottom bracket 1 is made of bakelite. The welding bottom plate 5 is made of copper, and the size of the bottom plate groove 6 processed in the middle is the welding area; the welding pressure plate 8 is made of copper, and the size of the welding long groove 9 processed in the middle is the welding area.

[0029] The single-cell replacement board is made of bakelite non-metallic material. The external dimensions should be consistent with the main dimensions of the soft-pack battery, and the outer surface must be smooth, flat, without defects or sharp corners to prevent damage to the surface of the soft-pack battery.

[0030] In the welding positioning device, the bottom bracket part supporting the single battery is made of bakelite non-metallic material, the internal size is the size of the single replacement plate, and the height can be designed according to the series-parallel design height of the battery module.

[0031] In the welding positioning device, at the welding positioning position, the welding base plate is made of copper material, which effectively supports the pressure of the welding pressure plate during laser welding of the pole ear, and provides a heat dissipation channel to prevent the battery from being heated. A groove is processed in the middle with the size of the welding area to prevent the pole ear from being welded to the welding base plate during laser welding and causing damage to the battery. The welding pressure plate is also made of copper material, with a long groove processed in the middle with the size of the welding area to allow the laser beam to pass through. The lower part of the pressure plate must be able to press the pole ear to complete the welding of the pole ear.

[0032] Linear bearings and elbow clamps are existing technologies and are purchased on the market, so they are not described here.

[0033] The electrical connection method using the above-mentioned positioning device for electrical connection of a soft-pack battery module comprises the following steps in sequence:

[0034] (1) First, place the single replacement board between a pair of clamps on the bottom bracket of the welding positioning device. The number is the number of module series and parallel design minus 2;

[0035] (2) Prepare two soft-pack single cells and insulate the tab on the end that does not need to be welded temporarily;

[0036] (3) Place the two soft-pack single cells that need to be connected in series and parallel on the single cell replacement board, place the tabs on the welding base plate, confirm the tab welding position, place the elbow clamp, and press the welding pressure plate tightly on the tabs. Figure 3 .

[0037] (4) Place the welding positioning device at the laser welding machine station and adjust the laser beam 14 for welding. Figure 4 ;

[0038] (5) After welding is completed, take out a single cell replacement plate, turn over the two soft-pack single cells, place the unwelded end tab on the welding base plate, and stack a new soft-pack single cell on top. Extend the tab 15 of the bottom single cell into the accommodation space under the welding base plate, confirm the welding position of the tabs of the two upper single cells, place the elbow clamp, and press the welding plate tightly on the tabs. Figure 5 ;

[0039] (6) Repeat step (4) welding, and then repeat step (5) to start the cycle until the battery module is electrically connected in series and parallel.

[0040] The welding positioning device of the present invention connects each soft-pack battery in series and in parallel by directly laser welding the tabs to complete the electrical connection. The electrical connection process design in the assembly of the soft-pack battery module is simplified. The process method is simple and reliable, and the direct and reliable electrical connection of the soft-pack battery is achieved, which improves the yield rate and assembly efficiency, reduces the weight proportion of the electrical connection structure, and greatly improves the specific energy of the soft-pack battery module.

[0041] The present invention uses direct welding of soft-pack battery tabs for electrical connection, which simplifies the electrical connection design of the soft-pack battery module, makes the assembly process simple, reliable and accurate, improves assembly efficiency, and enhances the effectiveness of electrical connection; the soft-pack battery tabs do not need to be bent, thus avoiding damage caused by bending stress on the battery tabs, improving the yield rate, and optimizing and enhancing the mechanical properties of the module structure; the components required for the assembly of the soft-pack battery module are reduced, the weight of the module structure is reduced, and the specific energy of the soft-pack battery module is greatly improved.

[0042] Under the premise that the basic form and structure remain unchanged, the present invention is used in the series-parallel electrical connection assembly of soft-packed single-cell batteries of different models and sizes, all of which fall within the protection scope of the present invention.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A positioning device for electrical connection of a soft pack battery module, characterized in that: The invention comprises a plurality of square single-body replacement plates (10) and a base (1). An operating step (2) is fixed at one end of the surface of the base (1), and a pair of parallel and perpendicular clamping plates (3) are arranged at the other end. The vertical sides of the pair of clamping plates (3) are pressed against the operating step (2). The distance between the pair of clamping plates (3) is just enough to fit the square single-body replacement plate (10). An accommodating space (4) for inserting a tab is opened on the operating step (2) between the pair of clamping plates (3). The top of the accommodating space (4) is A welding base plate (5) is provided at the bottom of the welding base plate (5), a base plate groove (6) is provided on the welding base plate (5), a pair of linear bearings (7) and a toggle clamp (11) are vertically provided on the operating step (2), a welding pressure plate (8) located above the welding base plate (5) is installed on the pair of linear bearings (7) and the toggle clamp (11), a welding long groove (9) is provided on the welding pressure plate (8), and the welding pressure plate (8) is controlled by the toggle clamp (11) to move up and down along the pair of linear bearings (7), so that the welding pressure plate (8) is pressed on the welding pressure plate (8).

2. The positioning device for electrical connection of a soft pack battery module according to claim 1, characterized in that: A concave groove (12) with an open top is formed in the middle of the card board (3), and the concave groove (12) facilitates the taking and placing of a single-cell replacement board (10) or a soft-pack single-cell battery (13) placed between a pair of card boards (3).

3. The positioning device for electrical connection of a soft pack battery module according to claim 1, characterized in that: The outer surface of the single replacement plate (10) is smooth and flat without defects or sharp edges, and is made of bakelite material.

4. The positioning device for electrical connection of a soft pack battery module according to claim 1, characterized in that: The base (1) is made of bakelite material.

5. The positioning device for electrical connection of a soft pack battery module according to claim 1, characterized in that: The welding base plate (5) is made of copper material, and the size of the base plate groove (6) processed in the middle is the welding area; the welding pressure plate (8) is made of copper material, and the size of the welding long groove (9) processed in the middle is the welding area.

6. An electrical connection method using the positioning device for electrical connection of a soft-pack battery module according to any one of claims 1 to 5, characterized in that: The following steps are included in sequence: (1) First, place the single replacement board between a pair of clamps on the bottom bracket of the welding positioning device. The number is the number of module series and parallel design minus 2; (2) Prepare two soft-pack single cells and insulate the tab on the end that does not need to be welded temporarily; (3) Place the two soft-pack single cells that need to be connected in series and parallel on the single cell replacement plate, place the tabs on the welding base plate, confirm the tab welding position, and place the elbow clamp so that the welding pressure plate is pressed tightly on the tabs; (4) Place the welding positioning device at the laser welding machine station and adjust the laser beam for welding; (5) After welding is completed, take out a single cell replacement plate, turn over the two soft-pack single cells, place the unwelded end tab on the welding base plate, and stack a new soft-pack single cell on top, extend the tab of the bottom single cell into the accommodation space under the welding base plate, confirm the tab welding position of the two upper single cells, and place the elbow clamp to press the welding plate against the tab; (6) Repeat step (4) welding, and then repeat step (5) to start the cycle until the battery module is electrically connected in series and parallel.

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