Fixing structure for electrode tab of battery cell of soft pack battery

Abstract

To provide a fixing structure for electrode tabs of a battery cell of a soft pack battery. [Solution] The electrode tab fixing structure has two bus structures 20, and a battery cell module is located between the bus structures, and each bus structure includes a support seat 21 and several bus bars 22, and each bus bar has a joint surface 25 formed thereon, and several first electrode tabs 43 in the battery cell module each pass through the support seat and have first joints 45 formed by bending attached to one joint surface, and several second electrode tabs 44 each pass through the support seat and have second joints 46 formed by bending attached to one first joint, and each of the first joints is located between one joint surface and one second joint, and the bus bars, each first joint and each second joint that are attached in sequence are fixed by welding.

Description

[Technical field]

[0001] The present invention relates to a soft-pack battery, and more particularly to a fixing structure for electrode tabs of battery cells of a soft-pack battery. [Background technology]

[0002] Soft-pack batteries are a type of ion battery that can store and release large amounts of electrical energy and are widely used as automotive batteries and electrical energy storage devices, including but not limited to lithium-ion batteries.

[0003] A type of soft-pack battery is known that includes a battery cell module, two bus structures, a protective case, and two electrodes. The battery cell module is mainly configured with several battery cells arranged in parallel, and each of the battery cells is used to store electrical energy. Each of the battery cells has two electrode tabs, and each of the electrode tabs functions as a positive electrode or a negative electrode of the battery cell. The bus structures are provided on both ends of the battery cell module, and each of the bus structures has one to a plurality of bus bars. Each of the electrode tabs is electrically connected to an adjacent bus bar. The battery cells are connected in series or parallel through the electrode tabs and the bus bars, the protective case is used to encase and position the battery cell module, the protective case is mainly made of a metal material and provides protection for the battery cell module, the electrodes are electrically connected to one of the bus bars, and the electrodes are electrically connected to an external power transmission line or an electrical equipment, so that the battery cell module can supply power to the outside, and an external power source can charge each of the battery cells through the power transmission line.

[0004] Each of the bus structures further includes a support seat, wherein each of the support seats is a plate-shaped structure made of an insulating material, each of the bus bars is a plate made of a conductive material, each of the support seats has several elongated paths passing through it, one side of each of the support seats faces the battery cell module and the bus bar is fixedly installed on the other side of each of the support seats, each of the plate-shaped electrode tabs passes through one of the paths and is folded and attached to a surface of one of the bus bars, and each of the electrode tabs is welded to the bus bar attached thereto. Summary of the Invention [Problem to be solved by the invention]

[0005] Each of the electrode tabs is affixed to the surface of one of the bus bars on the side farther away from the support seat, and the bus bars constituting each of the entire bus structures need to provide a sufficient width in the thickness direction of the battery cell, so that after each of the multiple electrode tabs is folded, one bus bar can be affixed sequentially at intervals along the thickness direction.

[0006] The main objective of the present invention is to provide a fixing structure for electrode tabs of battery cells in a soft-pack battery. [Means for solving the problem]

[0007] To achieve the above objectives, the present invention adopts the following technical solutions: The present invention is a fixing structure for the electrode tabs of a battery cell of a soft-pack battery with two bus structures, The soft-pack battery has a battery cell module including several first battery cells and several second battery cells, each of the first battery cells and each of the second battery cells having a predetermined thickness, length and width, a thickness direction of each of the first battery cells and each of the second battery cells is defined as a first direction, a length direction of each of the first battery cells is defined as a second direction, the first direction and the second direction are perpendicular to each other, a width direction of each of the first battery cells is defined as a third direction, the first direction and the second direction are each perpendicular to the third direction, and each of the first battery cells is defined as a positive each of the first battery cells has two first electrode tabs functioning as a positive electrode or a negative electrode, and each of the first electrode tabs is provided at both ends of each of the first battery cells in the second direction; each of the second battery cells has two second electrode tabs functioning as a positive electrode or a negative electrode, and each of the second electrode tabs is provided at both ends of each of the second battery cells in the second direction, each of the first electrode tabs and each of the second electrode tabs is a single body made of a conductive material, and each of the first electrode tabs and each of the second electrode tabs is formed to extend a predetermined width in the third direction; The bus structures are spaced apart along the second direction, and the battery cell modules are disposed between the bus structures. each of the bus structures includes a support seat and several bus bars, each of the support seats being made of an insulating material, each of the bus bars being a plate made of a conductive material, each of the support seats facing one side of the battery cell module in the second direction, each of the bus bars being connected to one side of the support seats that is far from the battery cell module along the second direction, each of the support seats having several first paths and several second paths penetrating therethrough along the second direction, each of the bus bars forming a joint surface on one side that is far from the support seat connected thereto along the second direction, each of the first electrode tabs passes through one of the first paths, and each of the first electrode tabs is bent along the first direction to form a first joint, each of the first joints is attached to the joint surface of one of the bus bars; each of the second electrode tabs passes through one of the second paths, and each of the second electrode tabs is bent along the first direction to form a second joint, each of the second joints is attached to one of the first joints, and each of the first joints is located between one of the joint surfaces and one of the second joints, and the bus bars, each of the first joints, and each of the second joints attached sequentially along the second direction are fixedly coupled to each other by welding. Effect of the Invention

[0008] Each of the first joints and each of the second joints are attached so as to overlap each other in the second direction, and the first joints, the second joints and the bus bar are fixedly joined by welding, which is advantageous for reducing the dimensions of the soft-pack battery in the first direction. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view of a soft-pack battery having a preferred embodiment of the present invention; FIG. [Diagram 2] 1 is an exploded perspective view of a soft-pack battery according to a preferred embodiment of the present invention; FIG. [Diagram 3] FIG. 2 is an exploded perspective view of a bus structure according to a preferred embodiment of the present invention; [Figure 4] FIG. 2 is a perspective view of a support seat of the bus structure according to the preferred embodiment of the present invention; [Diagram 5] FIG. 2 is a top view of the battery cell module showing the first and second electrode tabs being bent to form first and second joints, respectively. [Figure 6] 6 is an enlarged partial view of FIG. 5, showing the enclosed area designated by the numeral 6; [Figure 7]6 is an enlarged view of a portion of FIG. 5, showing the enclosed area designated by the numeral 7; [Figure 8] 1 is a cross-sectional view of a battery cell module according to a preferred embodiment of the present invention; [Figure 9] 9 is an enlarged partial view of FIG. 8, showing the enclosed area designated by the numeral 9; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] As shown in Figs. 1 to 9, a preferred embodiment of the electrode tab fixing structure of the battery cell of the soft-pack battery of the present invention has two bus structures 20. This type of soft-pack battery 01 having this preferred embodiment includes a protective case 10, each of the bus structures 20, two electrodes 30, and a battery cell module 40. Among them, the protective case 10 is mainly made of a metal material. The protective case 10 has a bottom plate 12, two side plates 14, and a cover plate 16. The bottom plate 12 is made of a metal material. The side plates 14 are ... 2 is used for mounting the battery cell module 40, the side plates 14 are arranged to face each other laterally, the cover plate 16 is connected to each of the side plates 14, and each of the side plates 14 is connected to the bottom plate 12, the battery cell module 40 is located between each of the side plates 14, and the battery cell module 40 is located between the bottom plate 12 and the cover plate 16, and the protective case 10 provides protection for the battery cell module 40.

[0011] The battery cell module 40 includes several first battery cells 41 and several second battery cells 42, and each of the first battery cells 41 and each of the second battery cells 42 has a predetermined thickness, length, and width, a thickness direction of each of the first battery cells 41 and each of the second battery cells 42 is defined as a first direction 92, a length direction of each of the first battery cells 41 is defined as a second direction 94, the first direction 92 and the second direction 94 are perpendicular to each other, a width direction of each of the first battery cells 41 is defined as a third direction 96, and the first direction 92 and the second direction 94 are perpendicular to each other, and each of the first battery cells 41 has a positive electrode Each of the first battery cells 41 has two first electrode tabs 43 functioning as a positive electrode or a negative electrode, and each of the first electrode tabs 43 is provided at both ends of the first battery cell 41 in the second direction 94, and each of the second battery cells 42 has two second electrode tabs 44 functioning as a positive electrode or a negative electrode, and each of the second electrode tabs 44 is provided at both ends of the second battery cell 42 in the second direction 94, and each of the first electrode tabs 43 and each of the second electrode tabs 44 is a single body made of a conductive material, and each of the first electrode tabs 43 and each of the second electrode tabs 44 is formed to extend a predetermined width toward the third direction 96.

[0012] The bus structures 20 are spaced apart along the second direction 94 , and the battery cell modules 40 are located between the bus structures 20 .

[0013] Each of the bus structures 20 includes a support seat 21 and several bus bars 22, wherein each of the support seats 21 is made of an insulating material and each of the bus bars 22 is a plate made of a conductive material. Each of the support seats 21 faces the battery cell module 40 on one side in the second direction 94, and each of the bus bars 22 is connected to one side of each of the support seats 21 that is far from the battery cell module 40 along the second direction 94. Each of the support seats 21 has several first paths 23 and several second paths 24 penetrating therethrough along the second direction 94, and each of the bus bars 22 forms a joint surface 25 on one side that is far from the support seat 21 connected to it along the second direction 94.

[0014] Each of the first electrode tabs 43 passes through one of the first paths 23, and each of the first electrode tabs 43 is bent along the first direction 92 to form a first joint 45, and each of the first joints 45 is attached to the joint surface 25 of one of the bus bars 22, each of the second electrode tabs 44 passes through one of the second paths 24, and each of the second electrode tabs 44 is bent along the first direction 92 to form a second joint 46, and each of the second joints 46 is attached to one of the first joints 45, and each of the first joints 45 is located between one of the joint surfaces 25 and one of the second joints 46, and each of the bus bars 22, each of the first joints 45, and each of the second joints 46 attached sequentially along the second direction 94 are fixedly connected by welding.

[0015] Specifically, the first battery cells 41 and the second battery cells 42 are arranged and installed along the first direction 92, each of the first battery cells 41 is adjacent to one of the second battery cells 42 in the first direction 92, each of the first electrode tabs 43 is adjacent to one of the second electrode tabs 44 in the first direction 92, and each of the first joints 45 and one of the second joints 46 attached adjacent to it extend opposite to each other in the first direction 92 and are arranged to intersect with each other. This makes it possible for each of the first electrode tabs 43 and each of the first joints 45 to form an enclosing state with respect to each of the bus bars 22 connected thereto, in accordance with the adjacent second electrode tabs 44 and each of the second joints 46, thereby increasing the bonding strength of each of the first electrode tabs 43, each of the second electrode tabs 44, and each of the bus bars 22.

[0016] Each of the first joints 45 and each of the second joints 46 are attached to each other in an overlapping manner in the second direction 94, and the first joints 45, the second joints 46 and the bus bars 22 are joined and fixed by welding means to satisfy the electrical connection requirements of the battery cell module 40. Therefore, the total width requirement in the first direction 92 of the bus bars 22 that constitute the entirety of each of the bus structures 20 can be kept lower than in the conventional technology, which is advantageous for reducing the dimensions of the soft-pack battery 01 in the first direction 92.

[0017] Each of the first joints 45 and one of the second joints 46 selectively attached adjacent to it extend opposite to each other, and each of the adjacent first electrode tabs 43 and each of the adjacent second electrode tabs 44 form a relative clamp in the first direction 92 with respect to the bus bar 22 connected thereto, and a static friction force is formed between each of the first joints 45 and the second joints 46 connected thereto and the bus bar 22, respectively, thereby increasing the positioning firmness of each of the first joints 45 and each of the second joints 46 in the first direction 92.

[0018] Each of the first electrode tabs 43 and each of the second electrode tabs 44 abuts against each of the support seats 21 along one side of the first direction 92 to form a side wall 26 of each of the first path 23 and each of the second path 24, thereby increasing the positioning certainty of each of the first electrode tabs 43 and each of the second electrode tabs 44 in the second direction 94. [Explanation of symbols]

[0019] 01: Soft pack battery 10: Protective case 12: Bottom plate 14: Side panel 16: Lid plate 20: Bus structure 21: Support seat 22: Busbar 23: Route 1 24: Route 2 25: Joint surface 26: Side wall 30: Electrode 40: Battery cell module 41: First battery cell 42: Second battery cell 43: First electrode tab 44: Second electrode tab 45: 1st joint 46:Second joint 92: 1st direction 94:Second direction 96: Third direction

Claims

1. A fixing structure for an electrode tab of a battery cell of a soft-pack battery having two bus structures, The soft-pack battery has a battery cell module including several first battery cells and several second battery cells, each of the first battery cells and each of the second battery cells having a predetermined thickness, length and width, a thickness direction of each of the first battery cells and each of the second battery cells is defined as a first direction, a length direction of each of the first battery cells is defined as a second direction, the first direction and the second direction are perpendicular to each other, a width direction of each of the first battery cells is defined as a third direction, the first direction and the second direction are each perpendicular to the third direction, and each of the first battery cells is defined as a positive each of the first battery cells has two first electrode tabs functioning as a positive electrode or a negative electrode, and each of the first electrode tabs is provided at both ends of each of the first battery cells in the second direction; each of the second battery cells has two second electrode tabs functioning as a positive electrode or a negative electrode, and each of the second electrode tabs is provided at both ends of each of the second battery cells in the second direction, each of the first electrode tabs and each of the second electrode tabs is a single piece made of a conductive material, and each of the first electrode tabs and each of the second electrode tabs is formed to extend a predetermined width in the third direction; The bus structures are spaced apart along the second direction, and the battery cell modules are disposed between the bus structures; each of the bus structures includes a support seat and several bus bars, each of the support seats being made of an insulating material, each of the bus bars being a plate made of a conductive material, each of the support seats facing one side of the battery cell module in the second direction, each of the bus bars being connected to one side of the support seats that is far from the battery cell module along the second direction, each of the support seats having several first paths and several second paths penetrating therethrough along the second direction, each of the bus bars forming a joint surface on one side that is far from the support seat connected thereto along the second direction, a first electrode tab passing through one of the first paths and being bent along the first direction to form a first joint, each of the first joints being attached to a joint surface of one of the bus bars, a second electrode tab passing through one of the second paths and being bent along the first direction to form a second joint, each of the second joints being attached to one of the first joints, each of the first joints being located between one of the joint surfaces and one of the second joints, and each of the bus bars, each of the first joints and each of the second joints being attached in sequence along the second direction are fixedly coupled to each other by welding.

2. 2. The electrode tab fixing structure of a battery cell of a soft pack battery according to claim 1, wherein each of the first electrode tabs and each of the second electrode tabs are abutted against each of the support seats along one side in the first direction to form side walls of each of the first paths and each of the second paths.

3. 2. The electrode tab fixing structure for a battery cell of a soft-pack battery according to claim 1, wherein each of the first joint portions and one of the second joint portions attached adjacent thereto extend opposite to each other in the first direction and are arranged so as to intersect with each other.

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