Battery cell assembly structure and secondary battery

Abstract

The utility model provides a battery cell assembly structure and a secondary battery. The battery cell assembly structure comprises a battery cell; the insulation sheet is encircled to form a containing space and is provided with an opening, and the battery core is contained in the containing space; and the top surface of the lower plastic is connected with the insulating sheet and blocks the opening. According to the utility model, the problem of high risk of insulation failure of the secondary battery in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, and in particular to a battery core assembly structure and a secondary battery. Background Art

[0002] Secondary batteries, also known as rechargeable batteries or storage batteries, refer to batteries that can be recharged to activate the active materials after being discharged and continue to be used. Existing secondary batteries mainly include nickel-metal hydride batteries, nickel-chromium batteries, lead-acid batteries, lithium-ion batteries, etc.

[0003] At present, secondary batteries usually include a top cover, a battery cell and a shell, in which an insulating sheet structure is required to insulate the battery cell from the shell. Due to the limitations of the battery structure, it is difficult to achieve a top hot-melt connection when the insulating sheet structure wraps the battery cell, which increases the risk of insulation failure and thus affects the safety of the battery cell.

[0004] As can be seen from the above, the prior art has the problem of high risk of insulation failure of secondary batteries. Utility Model Content

[0005] The main purpose of the utility model is to provide a battery core assembly structure and a secondary battery to solve the problem of high risk of insulation failure of secondary batteries in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a battery cell assembly structure is provided, comprising: a battery cell; an insulating sheet, the insulating sheet enclosing a containing space and having an opening, the battery cell being contained in the containing space; and a lower plastic, the top surface of the lower plastic being connected to the insulating sheet and sealing the opening.

[0007] Furthermore, the opening has a skirt structure folded inwards, and the top peripheral edge of the lower plastic is connected to the skirt structure.

[0008] Furthermore, the battery cell assembly structure also includes: a transfer plate, which is arranged below the lower plastic, on which a pole is arranged, and the transfer plate is electrically connected to the pole ear of the battery cell; an insulating gasket, which is arranged between the transfer plate and the battery cell, and is detachably connected to the lower plastic.

[0009] Furthermore, the battery cell assembly structure also includes: a top cover sheet, which is arranged above the lower plastic and is used to connect with the shell of the secondary battery; a positioning block, the top cover sheet is provided with a receiving groove and a first avoidance hole connected to the receiving groove, at least a portion of the positioning block is received in the receiving groove, the positioning block is provided with a connecting hole, and the lower plastic is provided with a second avoidance hole, the pole passes through the second avoidance hole, the first avoidance hole and the connecting hole in sequence and protrudes from the top surface of the positioning block, and the pole is welded to the positioning block.

[0010] Furthermore, the battery cell assembly structure also includes a seal, which is arranged between the pole and the positioning block.

[0011] Furthermore, the insulating gasket and the lower plastic are snap-connected.

[0012] Furthermore, one of the insulating gasket and the lower plastic is provided with a buckle, and the other is correspondingly provided with a buckle hole, and the buckle is passed through the buckle hole, so that the insulating gasket and the lower plastic are buckled and fixed.

[0013] Furthermore, there are multiple buckles and multiple buckle holes, and the multiple buckles and multiple buckle holes are arranged at intervals.

[0014] Furthermore, the insulating sheet includes a first large surface, a second large surface, a first side surface, a second side surface and a bottom surface, and the first large surface, the second large surface, the first side surface, the second side surface and the bottom surface form an accommodating space.

[0015] According to another aspect of the utility model, a secondary battery is provided, comprising a shell and the above-mentioned battery cell assembly structure, wherein the battery cell assembly structure is accommodated in the shell, and a top cover sheet of the battery cell assembly structure is connected to the shell.

[0016] By applying the technical solution of the utility model, the battery cell assembly structure includes a battery cell, an insulating sheet and a lower plastic, the insulating sheet enclosing a accommodating space and having an opening, the battery cell is accommodated in the accommodating space, and the top surface of the lower plastic is connected to the insulating sheet and blocks the opening. In this way, by connecting the top surface of the lower plastic to the insulating sheet and blocking the opening of the insulating sheet, the insulating sheet and the lower plastic can completely wrap the battery cell together, thereby ensuring the insulation performance of the battery cell, improving the safety of the battery cell, greatly reducing the risk of insulation failure of the secondary battery, and solving the problem of high risk of insulation failure of the secondary battery in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 An exploded view of a secondary battery in a specific embodiment of the utility model is shown;

[0019] Figure 2 An exploded view of a battery cell assembly structure in a specific embodiment of the utility model is shown;

[0020] Figure 3 A schematic structural diagram of a battery cell assembly structure in a specific embodiment of the utility model is shown;

[0021] Figure 4It shows a schematic diagram of the structure before the lower plastic and the insulating sheet are connected and molded in a specific embodiment of the utility model;

[0022] Figure 5 The figure shows a structural schematic diagram of a lower plastic and an insulating sheet after being connected and formed in a specific embodiment of the utility model.

[0023] The above drawings include the following reference numerals:

[0024] 10. Insulating sheet; 11. Skirt structure; 20. Lower plastic; 21. Second avoidance hole; 22. Buckle hole; 30. Adapter; 40. Pole; 50. Insulating gasket; 51. Buckle; 60. Top cover; 61. Accommodating groove; 62. First avoidance hole; 70. Positioning block; 71. Connecting hole; 80. Seal; 90. Shell. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0027] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0028] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0029] In order to solve the problem of high risk of insulation failure of secondary batteries in the prior art, the utility model provides a battery cell assembly structure and a secondary battery. The secondary battery described below includes the battery cell assembly structure described below.

[0030] like Figure 1 to Figure 2 As shown, the cell assembly structure includes a cell, an insulating sheet 10 and a lower plastic 20. The insulating sheet 10 encloses a receiving space and has an opening, the cell is received in the receiving space, and the top surface of the lower plastic 20 is connected to the insulating sheet 10 and blocks the opening.

[0031] By setting up a battery cell assembly structure including a battery cell, an insulating sheet 10 and a lower plastic 20, the insulating sheet 10 encloses a containing space and has an opening, the battery cell is contained in the containing space, and the lower plastic 20 blocks the opening, so that the insulating sheet 10 and the lower plastic 20 can completely wrap the battery cell together; further, by connecting the top surface of the lower plastic 20 with the insulating sheet 10, it is ensured that the insulating sheet 10 and the lower plastic 20 are connected and fixed, so that the battery cell is wrapped very firmly, the insulation performance of the battery cell is guaranteed, the safety of the battery cell is improved, and the risk of insulation failure of the secondary battery is greatly reduced.

[0032] In this embodiment, the insulating sheet 10 includes a first large surface, a second large surface, a first side surface, a second side surface and a bottom surface. The first large surface, the second large surface, the first side surface, the second side surface and the bottom surface are folded to form an accommodation space.

[0033] Specifically, the insulating sheet 10 can be formed by splicing two sheets, such as Figure 4 As shown, the insulating sheet 10 includes two spaced and vertically arranged sheets, the main parts of the two sheets are respectively the first large face and the second large face, and the two ends of the two sheets are respectively folded inwards to form the first side face and the second side face. Further, the bottom ends of the two sheets are also folded inwards to form the bottom face. The two ends of the two sheets have overlapping parts when forming the first side face and the second side face, thereby improving the sealing and connection firmness. Similarly, the bottom ends of the two sheets also have overlapping parts when forming the bottom face. Through the above folding, a box body for wrapping the battery cell is formed, and the box body has the above-mentioned accommodating space, and the opening is located at the top of the box body. That is to say, the first large face, the second large face, the first side face, the second side face and the bottom face in this embodiment can respectively wrap the other five faces of the battery cell except the top face, and the lower plastic 20 is used to wrap the top face of the battery cell, thereby forming a complete insulation seal. Among them, the overlapping parts of the first side face, the second side face and the bottom face can be fixed with hot melt adhesive.

[0034] In an optional embodiment, the insulating sheet 10 may also be a one-piece structure (not shown in the figure), that is, the first large surface, the second large surface, the first side surface, the second side surface and the bottom surface of the insulating sheet 10 are integrally formed. Through the above arrangement, the structural strength of the insulating sheet 10 is ensured, and it is convenient to manually operate the insulating sheet 10 to wrap the battery cell, thereby improving the assembly efficiency.

[0035] like Figures 4 to 5As shown, the opening of the insulating sheet 10 has a skirt structure 11 folded inward, and the periphery of the top surface of the lower plastic 20 is connected to the skirt structure 11. In other words, the lower plastic 20 is also located in the accommodation space surrounded by the insulating sheet 10. Specifically, the tops of the first large surface, the second large surface, the first side surface, and the second side surface are all folded inward to form the skirt structure 11. After the box body is formed, the four skirt structures 11 are respectively connected to the periphery of the top surface of the lower plastic 20, thereby connecting and fixing the lower plastic 20 to the insulating sheet 10, so that the insulating sheet 10 and the lower plastic 20 can completely wrap the battery cell together.

[0036] In this embodiment, the skirt structure 11 and the lower plastic 20 are connected by hot melting.

[0037] like Figures 1 to 3 As shown, the battery cell assembly structure also includes a transfer plate 30 and an insulating gasket 50. The transfer plate 30 is arranged below the lower plastic 20, and a pole 40 is arranged on the transfer plate 30, and the transfer plate 30 is electrically connected to the pole tab of the battery cell. The insulating gasket 50 is arranged between the transfer plate 30 and the battery cell, and is detachably connected to the lower plastic 20. Specifically, the pole tab of the battery cell is located on the side of the battery cell along the length direction, and the width of the insulating gasket 50 is smaller than the width of the battery cell, so that the pole tab extends upward to the top of the transfer plate 30 and is folded, so as to be welded with the transfer plate 30.

[0038] In this embodiment, there are two poles 40 , namely a positive pole and a negative pole, and correspondingly, there are also two adapter plates 30 .

[0039] In this embodiment, the insulating gasket 50 can be made of insulating materials such as PP, PET, PC, PVC, PA or rubber.

[0040] like Figure 1 to Figure 2As shown, the battery cell assembly structure also includes a top cover sheet 60 and a positioning block 70. The top cover sheet 60 is arranged above the lower plastic 20, and is used to connect with the shell 90 of the secondary battery. The top cover sheet 60 is provided with a receiving groove 61 and a first avoidance hole 62 connected to the receiving groove 61, and at least a part of the positioning block 70 is accommodated in the receiving groove 61. The positioning block 70 is provided with a connecting hole 71, and the lower plastic 20 is provided with a second avoidance hole 21. The pole 40 passes through the second avoidance hole 21, the first avoidance hole 62 and the connecting hole 71 in sequence and protrudes from the top surface of the positioning block 70, and the pole 40 is welded to the positioning block 70. Specifically, the second avoidance hole 21, the first avoidance hole 62 and the connecting hole 71 are coaxially arranged up and down. The receiving groove 61 is opened on the upper surface of the top cover sheet 60, and the lower part of the positioning block 70 is received in the receiving groove 61, and the upper part is exposed outside the receiving groove 61, or the positioning block 70 is received in the receiving groove 61 as a whole. Through the above arrangement, the gap between the lower plastic 20 and the insulating gasket 50 can be reduced, thereby avoiding the vibration space after the tab is welded to the upper surface of the adapter sheet 30, and the weld mark is easy to loosen during the vibration process, increasing the risk of insulation failure and affecting the safety of the battery cell.

[0041] In this embodiment, the lower surface of the top cover sheet 60 matches the upper surface of the hot-melted lower plastic 20 .

[0042] It is understandable that the positioning block 70 is made of metal material. Furthermore, the positioning block 70 and the pole 40 are made of the same material to improve the welding effect and avoid electrochemical corrosion.

[0043] The technical solution of this embodiment cancels the traditional hot-melt method of the top cover sheet 60 and the lower plastic 20, and instead adopts a detachable connection method between the lower plastic 20 and the insulating gasket 50, and then the insulating sheet 10 and the lower plastic 20 are hot-melt connected, and finally the top cover sheet 60 is installed separately with the shell 90 of the secondary battery, thereby reducing the overall thickness of the lower plastic 20 and the insulating gasket 50, saving space, and improving space utilization, while ensuring the insulation performance of the adapter sheet 30 and the battery cell and the shell 90, reducing production costs.

[0044] In this embodiment, the insulating gasket 50 and the lower plastic 20 are clamped together.

[0045] like Figures 2 to 3 As shown, the insulating gasket 50 is provided with a buckle 51, and the lower plastic 20 is correspondingly provided with a buckle hole 22, and the buckle 51 is penetrated through the buckle hole 22, so that the insulating gasket 50 and the lower plastic 20 are clamped and fixed. Of course, the insulating gasket 50 can also be provided with a buckle hole 22, and the lower plastic 20 can be correspondingly provided with a buckle 51. Further, the insulating gasket 50 and the lower plastic 20 can also be clamped in a buckle and a slot or other types of detachable methods, which can be selected according to actual needs.

[0046] In this embodiment, there are multiple buckles 51 and buckle holes 22, and the multiple buckles 51 and the multiple buckle holes 22 are arranged at intervals. Specifically, since the two-pole components in this embodiment are symmetrically arranged along the length direction of the battery cell, the multiple buckles 51 and the buckle holes 22 can also be symmetrically arranged along the length direction of the battery cell to improve the connection firmness and stability.

[0047] like Figure 1 to Figure 2 As shown, the cell assembly structure further includes a seal 80. The seal 80 is disposed between the pole 40 and the positioning block 70, and the seal 80 cooperates with the step surface of the pole 40. By providing the seal 80, the sealing between the pole 40 and the positioning block 70 can be improved, and impurities such as water and dust can be prevented from entering the cell, thereby ensuring the safety of the cell.

[0048] In this embodiment, the sealing member 80 is a rubber sealing ring.

[0049] like Figure 1 As shown, the present application also provides a secondary battery, including a housing 90 and the above-mentioned battery cell assembly structure, the battery cell assembly structure is accommodated in the housing 90, and the top cover sheet 60 is connected to the housing 90. Specifically, the top cover sheet 60 and the housing 90 are welded.

[0050] The assembly process of the secondary battery provided in the present application is as follows: placing the insulating gasket 50 on the top surface of the battery cell, placing the adapter plate 30 on the top surface of the insulating gasket 50, and welding the pole ear to the adapter plate 30; assembling the seal 80 on the periphery of the pole 40 of the adapter plate 30, the seal 80 cooperates with the platform of the pole 40, placing the lower plastic 20 on the top surface of the adapter plate 30, and the skirt structure 11 of the insulating sheet 10 is folded inward and fixed to the periphery of the top surface of the lower plastic 20 by hot melting; placing the top cover sheet 60 on the top surface of the lower plastic 20, at this time, the seal 80 is assembled between the pole 40 of the adapter plate 30 and the positioning block 70 of the top cover sheet 60, and the pole 40 is welded to the positioning block 70; the remaining part of the insulating sheet 10 completely covers the battery cell, and the bottom repeated part and the side overlapping part of the insulating sheet 10 are fixed by hot melting; the above structure is assembled as a whole in the shell 90, and the top cover sheet 60 is connected to the shell 90 to form a secondary battery.

[0051] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: by setting a battery cell assembly structure including a battery cell, an insulating sheet 10 and a lower plastic 20, the insulating sheet 10 encloses a accommodating space and has an opening, the battery cell is accommodated in the accommodating space, and the lower plastic 20 blocks the opening, so that the insulating sheet 10 and the lower plastic 20 can completely wrap the battery cell together; further, by connecting the top surface of the lower plastic 20 to the insulating sheet 10, it is ensured that the insulating sheet 10 and the lower plastic 20 are connected and fixed, so that it wraps the battery cell very firmly, ensures the insulation performance of the battery cell, improves the safety of the battery cell, and greatly reduces the risk of insulation failure of the secondary battery.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0053] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0054] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery cell assembly structure, characterized in that: include: Battery cells; An insulating sheet (10), the insulating sheet (10) enclosing a housing space and having an opening, the battery cell being housed in the housing space; A lower plastic (20), the top surface of the lower plastic (20) is connected to the insulating sheet (10) and blocks the opening.

2. The battery cell assembly structure according to claim 1, characterized in that: The opening is provided with a skirt structure (11) folded inwards, and the top surface periphery of the lower plastic (20) is connected to the skirt structure (11).

3. The battery cell assembly structure according to claim 1, characterized in that: The battery core assembly structure also includes: A transfer plate (30), the transfer plate (30) being arranged below the lower plastic (20), a pole (40) being arranged on the transfer plate (30), and the transfer plate (30) being electrically connected to a pole lug of the battery cell; An insulating gasket (50), the insulating gasket (50) is arranged between the adapter plate (30) and the battery core, and is detachably connected to the lower plastic (20).

4. The battery cell assembly structure according to claim 3, characterized in that: The battery core assembly structure also includes: A top cover sheet (60), the top cover sheet (60) being arranged above the lower plastic (20) and being used for connecting with a housing (90) of a secondary battery; A positioning block (70), the top cover sheet (60) is provided with a receiving groove (61) and a first avoidance hole (62) connected to the receiving groove (61), at least a portion of the positioning block (70) is accommodated in the receiving groove (61), the positioning block (70) is provided with a connecting hole (71), the lower plastic (20) is provided with a second avoidance hole (21), the pole (40) passes through the second avoidance hole (21), the first avoidance hole (62) and the connecting hole (71) in sequence and protrudes from the top surface of the positioning block (70), and the pole (40) is welded to the positioning block (70).

5. The battery cell assembly structure according to claim 4, characterized in that: The battery cell assembly structure further comprises a sealing member (80), wherein the sealing member (80) is arranged between the pole (40) and the positioning block (70).

6. The battery cell assembly structure according to claim 3, characterized in that: The insulating gasket (50) and the lower plastic (20) are clamped together.

7. The battery cell assembly structure according to claim 6, characterized in that: One of the insulating gasket (50) and the lower plastic (20) is provided with a buckle (51), and the other is correspondingly provided with a buckle hole (22), and the buckle (51) is passed through the buckle hole (22) so that the insulating gasket (50) and the lower plastic (20) are buckled and fixed.

8. The battery cell assembly structure according to claim 7, characterized in that: There are multiple buckles (51) and multiple buckle holes (22), and the multiple buckles (51) and the multiple buckle holes (22) are arranged at intervals.

9. The battery cell assembly structure according to any one of claims 1 to 8, characterized in that: The insulating sheet (10) comprises a first large surface, a second large surface, a first side surface, a second side surface and a bottom surface, and the first large surface, the second large surface, the first side surface, the second side surface and the bottom surface enclose the accommodation space.

10. A secondary battery, characterized in that: It comprises a shell (90) and a battery cell assembly structure according to any one of claims 1 to 9, wherein the battery cell assembly structure is accommodated in the shell (90), and a top cover sheet (60) of the battery cell assembly structure is connected to the shell (90).

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