Aluminum shell battery cell structure

Abstract

The utility model provides an aluminum shell battery cell structure, which comprises an insulating film, an insulating plate, a lower plastic plate, a top cover and two connecting pieces, and is characterized in that the insulating film is arranged on one side of the insulating plate and is used for wrapping the outer side of a winding battery cell; the lower plastic plate is detachably connected to one side, far away from the insulating film, of the insulating plate; the top cover is arranged on one side, far away from the insulating film, of the lower plastic plate; a positive pole and a negative pole are arranged on the top cover; and the two connecting pieces are arranged between the insulating film and the lower plastic plate, and are correspondingly and electrically connected with the positive pole and the negative pole of the top cover and the positive pole and the negative pole of the winding battery cell respectively. According to the aluminum shell cell structure, the hot melting process of the insulating film and the lower plastic plate is removed, the processes are reduced, the assembly precision is reduced, the insulating film and the insulating plate are hot-melted, assembly with a top cover assembly is not needed, and the assembly difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an aluminum shell battery core structure. Background Art

[0002] There are three types of battery cells: aluminum shell battery cells, soft pack battery cells, and cylindrical battery cells. Battery cells refer to the core components that provide power to devices such as power supplies or power tools. They are the main part of the battery and play the role of storing and releasing electrical energy. They are composed of positive electrodes, negative electrodes, electrolytes, and separators, and can store and release electrical energy in chemical reactions. The size, shape, and material of battery cells vary, depending on the purpose and needs of the battery.

[0003] A square shell battery cell membrane structure and a square shell battery cell structure with publication number CN216903134U include an insulating film, the insulating film includes a first side portion, a top cover portion and a second side portion connected in sequence along the length direction, both sides of the first side portion along the width direction extend outward along the width direction to form a first wing portion, both sides of the top cover plate along the width direction extend outward along the width direction to form a second wing portion, both sides of the second side portion along the width direction extend outward along the width direction to form a third wing portion, a positive pole opening, a negative pole opening and an explosion-proof opening are provided on the surface of the top cover portion, the first side portion, the top cover portion and the second side portion are all rectangular, and the edges of the parts where the first side portion, the top cover portion and the second side portion are connected to each other are continuous.

[0004] In the existing battery cell structure, the method to improve the space utilization rate of the single battery cell is to install more battery cell chemical materials under the same battery cell volume, but this will inevitably compress the volume of the lower plastic component, making the hot melting area of ​​the plastic under the insulating film small, which in turn leads to high assembly precision requirements and increases the difficulty of assembly. Utility Model Content

[0005] In view of this, the utility model proposes an aluminum shell battery core structure, which eliminates the hot-melt process of the insulating film and the lower plastic plate, reduces the process and reduces the assembly precision. In addition, the insulating film and the insulating plate are hot-melted, and there is no need to assemble them with the top cover assembly, reducing the assembly difficulty.

[0006] The technical solution of the utility model is implemented as follows: The utility model provides an aluminum shell battery core structure, including an insulating film, an insulating plate, a lower plastic plate, a top cover and two connecting parts, wherein:

[0007] The insulating film is arranged on one side of the insulating plate and is used to cover the outer side of the wound battery cell;

[0008] The lower plastic plate is detachably connected to a side of the insulating plate away from the insulating film;

[0009] The top cover is arranged on a side of the lower plastic plate away from the insulating film, and a positive pole and a negative pole are arranged on the top cover;

[0010] The two connectors are both arranged between the insulating film and the lower plastic plate, and the two connectors are respectively electrically connected to the positive and negative poles of the top cover and the positive and negative poles of the wound battery cell.

[0011] On the basis of the above technical solution, preferably, the insulating film includes a fixing portion, a first side portion, a second side portion, two first bottom package portions, four second bottom package portions and four side package portions, wherein:

[0012] The fixing portion is arranged on one side of the insulating plate;

[0013] The first side portion and the second side portion are respectively arranged on both sides of the length direction of the fixing portion, and the first side portion and the second side portion are symmetrically arranged along a vertical plane of a midline of the width direction of the fixing portion;

[0014] The two first bottom bag parts are arranged on a side of the first side portion opposite to the second side portion;

[0015] The four second bottom bag portions are respectively arranged on both sides of each first bottom bag portion along the width direction of the fixing portion;

[0016] The four side wrapping parts are respectively arranged on both sides of the first side part and the second side part along the width direction of the fixing part;

[0017] The first side portion, the second side portion, the first bottom package portion, the second bottom package portion and the side package portion are folded into a rectangular shape to cover the wound battery cell.

[0018] Based on the above technical solution, preferably, a plurality of positioning members are provided on the side of the insulating plate close to the insulating film, and positioning holes corresponding to the positions of the positioning members are opened on the insulating film. The positioning members abut against the positioning holes to position the insulating film and the insulating plate.

[0019] On the basis of the above technical solution, preferably, a plurality of thermal melting points are arranged between the insulating film and the insulating plate, the insulating film and the insulating plate are fixed by thermal melting, and the plurality of thermal melting points are evenly distributed on the surface of the insulating plate.

[0020] On the basis of the above technical solution, preferably, two annular bosses are provided on the side of the insulating plate away from the insulating film, the inner contour shape of the annular bosses matches the outer contour shape of the connecting piece, the connecting piece abuts against the inner side of the annular bosses, and the side of the connecting piece away from the insulating plate abuts against the surface of the lower plastic plate.

[0021] On the basis of the above technical solution, preferably, a plurality of recessed portions are evenly arranged on the outer side of the insulating plate, and a plurality of barbed portions corresponding to the positions of the recessed portions are arranged on the side of the lower plastic plate close to the insulating plate, and the barbed portions are clamped in the recessed portions to fix the position of the connecting piece.

[0022] On the basis of the above technical solution, preferably, the insulating plate is provided with a plurality of openings penetrating the insulating film, and the plurality of openings are respectively arranged in two annular bosses; and the tabs of the wound battery cell are fixed to corresponding connectors through the openings.

[0023] On the basis of the above technical solution, preferably, two protrusions are provided on the side of the insulating plate away from the insulating film, the two protrusions are arranged in each annular boss, and the positions of the two protrusions respectively correspond to the positions of the positive electrode column and the negative electrode column of the top cover, one end of the protrusion connected to the positive electrode of the wound battery cell passes through the lower plastic plate and abuts against the positive electrode column of the top cover, and one end of the other protrusion passes through the lower plastic plate and abuts against the negative electrode column of the top cover, and the connecting piece is sleeved on the outside of the protrusion.

[0024] On the basis of the above technical solution, preferably, the connecting member is provided with an avoidance hole corresponding to the position of the raised portion, the raised portion is provided with an annular portion, the outer contour shape of the annular portion matches the inner contour shape of the avoidance hole, and the annular portion abuts against the avoidance hole.

[0025] Based on the above technical solution, preferably, a plurality of extension parts are provided on the side of the lower plastic plate away from the insulating plate, and one end of the extension part away from the lower plastic plate abuts against the surface of the top cover for ultrasonic hot-melt fixing between the lower plastic plate and the top cover.

[0026] The aluminum shell battery core structure of the utility model has the following beneficial effects compared with the prior art:

[0027] (1) By hot-melting the insulating film and the insulating plate, there is no need to assemble them with the top cover assembly, which reduces the difficulty of assembly and improves the efficiency of battery cell assembly;

[0028] (2) By assembling the plastic plate, the top cover and the insulating plate, and electrically connecting the positive and negative tabs of the wound battery cell to the positive and negative poles of the top cover through the connector, the battery cell structure can avoid bending of the wound battery cell when it is inserted into the battery cell shell, and can also avoid light leakage during laser welding of the top cover, explosion points caused by laser contact with the insulating film, and other undesirable phenomena, thereby improving the yield of this process.

[0029] (3) By inserting the positioning piece into the positioning hole, the position of the insulating film and the position of the insulating plate can be positioned, effectively ensuring the hot melt accuracy;

[0030] (4) The lower plastic plate and the insulating plate are fixed by the provided hook portion being clamped in the recessed portion, and the installation process is convenient and quick, and easy to disassemble. At the same time, the recessed portion and the hook portion are evenly distributed, thereby effectively ensuring a stable connection between the lower plastic plate and the insulating plate, and improving the stability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a three-dimensional diagram of the aluminum shell battery core structure of the utility model;

[0033] Figure 2 A three-dimensional diagram of the expanded state of the insulating film of the aluminum shell battery core structure of the utility model;

[0034] Figure 3 The aluminum shell battery structure of the utility model Figure 2 A partial enlarged schematic diagram in the middle;

[0035] Figure 4 It is a three-dimensional diagram of the connection structure between the lower plastic plate and the insulating plate of the aluminum shell battery core structure of the utility model;

[0036] Figure 5 It is a three-dimensional diagram of the connection structure between the insulating plate and the connector of the aluminum shell battery structure of the utility model;

[0037] Figure 6 A three-dimensional diagram of the lower plastic plate of the aluminum shell battery core structure of the utility model;

[0038] Figure 7 It is a three-dimensional diagram of the insulating plate of the aluminum shell battery core structure of the present invention. DETAILED DESCRIPTION

[0039] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] like Figure 1-7 As shown, an aluminum shell battery cell structure of the utility model includes an insulating film 1, an insulating plate 2, a lower plastic plate 3, a top cover 4 and two connecting parts 5.

[0041] Among them, the insulating film 1 is arranged on one side of the insulating plate 2 and is used to wrap the outside of the wound battery cell; the lower plastic plate 3 is detachably connected to the side of the insulating plate 2 away from the insulating film 1; the top cover 4 is arranged on the side of the lower plastic plate 3 away from the insulating film 1, and the top cover 4 is provided with a positive electrode column and a negative electrode column; two connecting members 5 are arranged between the insulating film 1 and the lower plastic plate 3, and the two connecting members 5 are respectively electrically connected to the positive and negative electrode columns of the top cover 4 and the positive and negative electrodes of the wound battery cell.

[0042] It should be noted that, in the present embodiment, the insulating film 1 and the insulating plate 2 are first fixed by hot melt, and there is no need to assemble them with the top cover assembly during this process, thereby reducing the difficulty of assembly. Then, the positive and negative ears of the wound battery cell are respectively connected to the corresponding connectors 5, and then the insulating film 1 is directed toward the side away from the insulating plate 2 to wrap the wound battery cell, thereby reducing the difficulty of wrapping the insulating film 1. Subsequently, the plastic plate 3 and the top cover 4 are installed in sequence, and the positive and negative poles of the top cover 4 are respectively connected to the corresponding connectors 5 to complete the overall installation of the battery cell structure. This battery cell structure can avoid bending when the wound battery cell is put into the battery cell shell, and this structure can avoid light leakage during laser welding of the top cover 4, explosion points caused by laser contact with the insulating film 1, and other undesirable phenomena, thereby improving the yield of this process.

[0043] As a preferred embodiment, the insulating film 1 in this embodiment includes a fixed portion 11, a first side portion 12, a second side portion 13, two first bottom package portions 14, four second bottom package portions 15 and four side package portions 16, wherein the fixed portion 11 is arranged on one side of the insulating plate 2; the first side portion 12 and the second side portion 13 are respectively arranged on both sides of the length direction of the fixed portion 11, and the first side portion 12 and the second side portion 13 are symmetrically arranged along the vertical plane of the midline of the width direction of the fixed portion 11; the two first bottom package portions 14 are respectively arranged on the side opposite to the first side portion 12 and the second side portion 13; the four second bottom package portions 15 are respectively arranged on both sides of each first bottom package portion 14 along the width direction of the fixed portion 11; the four side package portions 16 are respectively arranged on both sides of the first side portion 12 and the second side portion 13 along the width direction of the fixed portion 11; the first side portion 12, the second side portion 13, the first bottom package portion 14, the second bottom package portion 15 and the side package portion 16 are folded into a rectangular shape to cover the wound battery cell.

[0044] It should be noted that this part is the unfolded state of the insulating film 1. When wrapping the battery cell, first, the positive ear and the negative ear of the wound battery cell are respectively connected to the corresponding connecting piece 5, and then the first side portion 12 and the second side portion 13 are respectively attached to both sides of the length direction of the wound battery cell, and then the side package portion 16 connected on both sides of the first side portion 12 and the second side portion 13 is folded toward the wound battery cell, and the side package portion 16 is attached to the side of the wound battery cell, and then the first bottom package portions 14 on both sides are folded toward the side of the wound battery cell, so that the first bottom package portion 14 is attached to the bottom of the wound battery cell, and finally the second bottom package portions 15 on both sides are folded toward the side package portions 16, and attached to each other to form a rectangular shape, and then the wrapped insulating film 1 is hot-melted to fix the structure of the insulating film 1. During the wrapping process, the insulating film 1 and the insulating plate 2 are hot-melted and wrapped downwardly, which reduces the difficulty of wrapping the insulating film 1.

[0045] In this embodiment, a plurality of positioning members 6 are arranged on one side of the insulating plate 2 close to the insulating film 1 . Positioning holes 100 corresponding to the positions of the positioning members 6 are opened on the insulating film 1 . The positioning members 6 abut against the positioning holes 100 to position the insulating film 1 and the insulating plate 2 .

[0046] It should be noted that the positions of the insulating plate 2 and the insulating film 1 need to be positioned before hot-melting them. The positioning piece 6 provided on the insulating plate 2 and the positioning hole 100 opened on the insulating film 1 are inserted into the positioning hole 100 through the positioning piece 6, so that the position of the insulating film 1 and the position of the insulating plate 2 can be positioned, and the hot-melt accuracy can be guaranteed.

[0047] In this embodiment, a plurality of thermal melting points 200 are arranged between the insulating film 1 and the insulating plate 2 , the insulating film 1 and the insulating plate 2 are fixed by thermal fusion, and the plurality of thermal melting points 200 are evenly distributed on the surface of the insulating plate 2 .

[0048] It should be noted that, by providing a plurality of thermal melting points 200 on the insulating film 1 and the insulating plate 2 , a stable connection between the insulating film 1 and the insulating plate 2 can be ensured, thereby improving the stability of the structure.

[0049] In this embodiment, two annular bosses 7 are provided on the side of the insulating plate 2 away from the insulating film 1, and the inner contour shape of the annular bosses 7 matches the outer contour shape of the connecting member 5. The connecting member 5 abuts against the inner side of the annular bosses 7, and the side of the connecting member 5 away from the insulating plate 2 abuts against the surface of the lower plastic plate 3.

[0050] It should be noted that the annular boss 7 can facilitate the rapid positioning and installation of the connector 5 , and can provide limited support for the connector 5 , with its upper surface abutting against the lower surface of the lower plastic plate 3 , making the connection more compact.

[0051] The outer side of the insulating plate 2 in this embodiment is evenly provided with a plurality of recessed portions 21 , and the side of the lower plastic plate 3 close to the insulating plate 2 is provided with a plurality of barbed portions 31 corresponding to the positions of the recessed portions 21 , and the barbed portions 31 are clamped in the recessed portions 21 to fix the position of the connector 5 .

[0052] It should be noted that the barb portion 31 has a certain deformation ability. During installation, by aligning the lower plastic plate 3 with the insulating plate 2 and then pressing down, the barb portion 31 will be angularly offset toward the outside. When the barb portion 31 corresponds to the position of the recessed portion 21, the barb portion 31 loses the force to reset, and then the barb portion 31 is clamped in the inside of the recessed portion 5. The installation process is convenient and fast, and easy to disassemble. At the same time, the recessed portion 21 and the barb portion 31 are evenly distributed, thereby effectively ensuring the stable connection between the lower plastic plate 3 and the insulating plate 2, thereby improving the stability of the structure.

[0053] In this embodiment, the insulating plate 2 is provided with a plurality of openings 201 penetrating the insulating film 1 , and the plurality of openings 201 are respectively arranged in the two annular bosses 7 ; the tabs of the wound battery cell pass through the openings 201 and are fixed to the corresponding connectors 5 .

[0054] In this embodiment, two protrusions 8 are provided on one side of the insulating plate 2 away from the insulating film 1. The two protrusions 8 are respectively arranged in each annular boss 7, and the positions of the two protrusions 8 correspond to the positions of the positive electrode column and the negative electrode column of the top cover 4 respectively. One end of the protrusion 8 connected to the positive electrode of the wound battery cell passes through the lower plastic plate 3 and abuts against the positive electrode column of the top cover 4, and one end of the other protrusion 8 passes through the lower plastic plate 3 and abuts against the negative electrode column of the top cover 4. The connecting piece 5 is sleeved on the outside of the protrusion 8.

[0055] It should be noted that the protrusion 8 and the connector 5 are both made of conductive materials, and the protrusion 8 enables the pole of the top cover 4 to be connected to the pole lug of the wound battery cell, thereby achieving the purpose of electrical energy conduction.

[0056] In this embodiment, the connecting member 5 is provided with an avoidance hole 500 corresponding to the position of the protruding portion 8, and the protruding portion 8 is provided with an annular portion 81. The outer contour shape of the annular portion 81 matches the inner contour shape of the avoidance hole 500, and the annular portion 81 abuts against the avoidance hole 500.

[0057] It should be noted that, by providing the avoidance hole 500 and the annular portion 81 , the position of the connecting member 5 is further limited and positioned, thereby improving the installation efficiency.

[0058] In this embodiment, a plurality of extension portions 9 are provided on one side of the lower plastic plate 3 away from the insulating plate 2 , and one end of the extension portion 9 away from the lower plastic plate 3 abuts against the surface of the top cover 4 for ultrasonic hot-melt fixing between the lower plastic plate 3 and the top cover 4 .

[0059] It should be noted that the provision of the extension portion 9 facilitates ultrasonic welding between the lower plastic plate 3 and the top cover 4 , thereby ensuring the connection stability between the lower plastic plate 3 and the top cover 4 , thereby making the overall structure of the battery cell more stable, thereby ensuring the stability of the insulating film 1 .

[0060] Working principle:

[0061] First, the insulating film 1 and the insulating plate 2 are fixed by hot melting, and then the positive and negative ears of the wound battery cell are connected to the corresponding connectors 5 respectively. Then, the insulating film 1 is wrapped around the wound battery cell toward the side away from the insulating plate 2, and then the plastic plate 3 and the top cover 4 are clamped and fixed by the barb portion 31 and the recessed portion 21. Finally, ultrasonic welding is used to fix the top cover 4 and the plastic plate 3.

[0062] 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, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An aluminum shell battery core structure, characterized in that: It comprises an insulating film (1), an insulating plate (2), a lower plastic plate (3), a top cover (4) and two connecting parts (5), wherein: The insulating film (1) is arranged on one side of the insulating plate (2) and is used to wrap around the outside of the wound battery core; The lower plastic plate (3) is detachably connected to a side of the insulating plate (2) away from the insulating film (1); The top cover (4) is arranged on a side of the lower plastic plate (3) away from the insulating film (1), and a positive electrode column and a negative electrode column are arranged on the top cover (4); The two connectors (5) are both arranged between the insulating film (1) and the lower plastic plate (3), and the two connectors (5) are respectively electrically connected to the positive and negative poles of the top cover (4) and the positive and negative poles of the wound battery cell.

2. The aluminum shell battery core structure according to claim 1, characterized in that: The insulating film (1) comprises a fixing portion (11), a first side portion (12), a second side portion (13), two first bottom package portions (14), four second bottom package portions (15) and four side package portions (16), wherein: The fixing portion (11) is arranged on one side of the insulating plate (2); The first side portion (12) and the second side portion (13) are respectively arranged on both sides of the length direction of the fixing portion (11), and the first side portion (12) and the second side portion (13) are symmetrically arranged along a vertical plane of a midline in the width direction of the fixing portion (11); The two first bottom bag portions (14) are respectively arranged on the side opposite to the first side portion (12) and the second side portion (13); The four second bottom package parts (15) are respectively arranged on both sides of each first bottom package part (14) along the width direction of the fixing part (11); The four side wrapping portions (16) are respectively arranged on both sides of the first side portion (12) and the second side portion (13) along the width direction of the fixing portion (11); The first side portion (12), the second side portion (13), the first bottom package portion (14), the second bottom package portion (15) and the side package portion (16) are folded into a rectangular shape to cover the wound battery core.

3. The aluminum shell battery core structure according to claim 2, characterized in that: A plurality of positioning members (6) are provided on one side of the insulating plate (2) close to the insulating film (1); positioning holes (100) corresponding to the positions of the positioning members (6) are provided on the insulating film (1); the positioning members (6) abut against the positioning holes (100) to position the insulating film (1) and the insulating plate (2).

4. The aluminum shell battery core structure according to claim 3, characterized in that: A plurality of hot melting points (200) are arranged between the insulating film (1) and the insulating plate (2); the insulating film (1) and the insulating plate (2) are fixed by hot melting, and the plurality of hot melting points (200) are evenly distributed on the surface of the insulating plate (2).

5. The aluminum shell battery core structure according to claim 1, characterized in that: Two annular bosses (7) are provided on the side of the insulating plate (2) away from the insulating film (1); the inner contour shape of the annular bosses (7) matches the outer contour shape of the connecting piece (5); the connecting piece (5) abuts against the inner side of the annular bosses (7), and the side of the connecting piece (5) away from the insulating plate (2) abuts against the surface of the lower plastic plate (3).

6. The aluminum shell battery core structure according to claim 5, characterized in that: The outer side of the insulating plate (2) is evenly provided with a plurality of recessed portions (21); the side of the lower plastic plate (3) close to the insulating plate (2) is provided with a plurality of barbed portions (31) corresponding to the positions of the recessed portions (21); the barbed portions (31) are snap-fitted into the recessed portions (21) to fix the position of the connecting piece (5).

7. The aluminum shell battery core structure according to claim 1, characterized in that: The insulating plate (2) is provided with a plurality of openings (201) penetrating the insulating film (1); the plurality of openings (201) are arranged in two annular bosses (7); and the pole tabs of the wound battery core pass through the openings (201) and are fixed to corresponding connectors (5).

8. The aluminum shell battery core structure according to claim 1, characterized in that: Two protrusions (8) are arranged on one side of the insulating plate (2) away from the insulating film (1), and the two protrusions (8) are arranged in each annular boss (7), and the positions of the two protrusions (8) respectively correspond to the positions of the positive pole and the negative pole of the top cover (4), one end of the protrusion (8) connected to the positive pole of the wound battery cell passes through the lower plastic plate (3) and abuts against the positive pole of the top cover (4), and one end of the other protrusion (8) passes through the lower plastic plate (3) and abuts against the negative pole of the top cover (4), and the connecting member (5) is sleeved on the outside of the protrusion (8).

9. The aluminum shell battery core structure according to claim 8, characterized in that: The connecting member (5) is provided with an avoidance hole (500) corresponding to the position of the raised portion (8), the raised portion (8) is provided with an annular portion (81), the outer contour shape of the annular portion (81) matches the inner contour shape of the avoidance hole (500), and the annular portion (81) abuts against the inside of the avoidance hole (500).

10. The aluminum shell battery core structure according to claim 1, characterized in that: A plurality of extension portions (9) are provided on a side of the lower plastic plate (3) away from the insulating plate (2); one end of the extension portion (9) away from the lower plastic plate (3) abuts against the surface of the top cover (4) for ultrasonic hot-melt fixing between the lower plastic plate (3) and the top cover (4).

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