Insulating spacer, battery cell top cover structure and secondary battery

Abstract

The utility model provides an insulating spacer, a battery cell top cover structure and a secondary battery. The insulating spacer includes: a main body portion; and the fins are arranged on the side edges of the main body part in the length direction and are used for covering the tabs of the battery cell after being folded upwards. 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 an insulating gasket, a battery core top cover 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] In the manufacturing process of secondary batteries (such as lithium-ion batteries), before completing the connection process between the pole ear and the adapter, an insulating gasket needs to be attached to the bottom of the adapter. After completing the connection process between the pole ear and the adapter, an insulating lower plastic needs to be designed under the top cover to isolate the pole ear and the top cover, so as to prevent the pole ear from directly contacting the top cover and the adapter from contacting the battery cell. In the prior art, the insulation of the pole ear and the adapter of the secondary battery usually adopts the method of insulating the pole ear and the top cover by using the lower plastic, and insulating the adapter from the battery cell by using the insulating gasket. The adhesive surface of the insulating gasket is bonded to the bottom of the adapter, and the smooth surface is in contact with the battery cell diaphragm to achieve insulation protection for the adapter and the battery cell. The pole ear is welded to the sunken table on the upper surface of the adapter, and a lower plastic is set under the top cover to isolate the pole ear and the top cover after welding.

[0004] However, after welding, the edges of the tabs are still warped, which can easily exceed the sinking surface of the adapter, posing a risk of contact with the top cover. In addition, the lower plastic area is large, the structure is complex, and there is a large margin of space between the tabs, posing a risk of poor insulation and limiting battery capacity.

[0005] 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

[0006] The main purpose of the utility model is to provide an insulating gasket, a battery cell top cover structure and a secondary battery, so as to solve the problem of high risk of insulation failure of secondary batteries in the prior art.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, an insulating gasket is provided, comprising: a main body; and fins, wherein the fins are arranged on the sides of the main body along the length direction and are used to be folded upwards to cover the tabs of the battery cell.

[0008] Furthermore, there are multiple fins, and the multiple fins are grouped in pairs to form multiple groups, and the two fins in each group are respectively located on both sides of the main body, and the multiple groups of fins are spaced apart along the length direction of the main body.

[0009] Furthermore, there are two fins, which are respectively located on two sides of the main body.

[0010] Furthermore, the main body is provided with a first avoidance hole for avoiding the pole ear, so that the pole ear passes through the insulating gasket and is connected to the adapter plate of the battery cell top cover structure.

[0011] Furthermore, the insulating gasket also includes a first rubber strip, which is arranged on the main body and is used to bond and fix the main body and the adapter sheet of the battery cell top cover structure.

[0012] Furthermore, the insulating gasket also includes a second rubber strip, which is arranged on the fin and is used to bond and fix the fin and the adapter sheet of the battery cell top cover structure.

[0013] Furthermore, the main body is provided with an exhaust hole, and the exhaust hole is arranged corresponding to the explosion-proof valve of the battery cell.

[0014] According to another aspect of the utility model, a battery cell top cover structure is also provided, including: a top cover, the top cover includes a top cover sheet, the top cover sheet is used to be connected to the shell of the secondary battery; a adapter sheet, a pole is arranged on the adapter sheet, and the adapter sheet is connected to the pole ear, and the pole is connected and fixed to the top cover; the above-mentioned insulating gasket, the insulating gasket is arranged between the adapter sheet and the battery cell.

[0015] Furthermore, the top cover also includes a positioning block, the top cover piece is provided with a receiving groove and a second avoidance hole connected to the receiving groove, at least a portion of the positioning block is accommodated in the receiving groove, the positioning block is provided with a connecting hole, the pole passes through the second 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; the battery cell top cover structure also includes a sealing member, the pole has a step surface, the sealing member is sleeved on the step surface, and is located between the pole and the positioning block.

[0016] According to another aspect of the utility model, a secondary battery is provided, comprising a shell, a battery cell and the above-mentioned battery cell top cover structure, wherein the battery cell top cover structure and the battery cell are accommodated in the shell, and the top cover sheet is connected to the shell.

[0017] By applying the technical solution of the utility model, the insulating gasket includes a main body and fins. The fins are arranged on the sides of the main body along the length direction and are used to cover the pole ears of the battery cell after being folded upwards. By arranging the fins that can be folded upwards on the insulating gasket, when the pole ears are welded to the upper surface of the adapter plate, the fins are folded to cover the pole ears, thereby replacing the lower plastic to isolate the pole ears and the top cover plate. This not only improves the space utilization rate between the battery cell and the top cover, but also effectively insulates and protects the adapter plate and the battery cell, the pole ears and the top cover plate, thereby ensuring the overall insulation of the secondary battery, 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

[0018] 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:

[0019] Figure 1 A schematic structural diagram of an insulating gasket in a specific embodiment of the utility model is shown;

[0020] Figure 2 A schematic diagram of the structure of an insulating gasket after folding the fins in a specific embodiment of the utility model is shown;

[0021] Figure 3 An exploded view of a battery cell top cover structure in a specific embodiment of the utility model is shown;

[0022] Figure 4 An exploded view of a secondary battery in a specific embodiment of the utility model is shown.

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

[0024] 10. Insulating gasket; 11. Main body; 111. First avoidance hole; 12. Fin; 13. First rubber strip; 14. Second rubber strip; 15. Exhaust hole; 20. Top cover; 30. Adapter; 40. Pole; 50. Positioning block; 51. Connecting hole; 60. Explosion-proof valve; 70. Upper plastic; 80. Seal; 90. Shell; 100. Battery cell; 110. Insulating sheet. 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 an insulating gasket, a battery cell top cover structure and a secondary battery. Among them, the battery cell top cover structure includes the insulating gasket. The secondary battery includes the battery cell top cover structure.

[0030] like Figure 1 to Figure 2 As shown, the insulating gasket includes a main body 11 and fins 12. The fins 12 are arranged on the side of the main body 11 in the length direction, and are used to be folded upward to cover the tabs of the battery cell 100. It can be understood that the fins 12 are arranged corresponding to the tabs.

[0031] An insulating gasket is provided to support the adapter 30, and a fin 12 that can be folded upward is provided on the insulating gasket. When the pole ear is welded to the upper surface of the adapter 30, the fin 12 is folded to cover the pole ear, thereby replacing the lower plastic to isolate the pole ear and the top cover sheet 20. This not only improves the space utilization rate between the battery cell 100 and the top cover, but also effectively insulates and protects the adapter 30 and the battery cell 100, the pole ear and the top cover sheet 20, thereby ensuring the overall insulation of the secondary battery and greatly reducing the risk of insulation failure of the secondary battery.

[0032] In this embodiment, there are multiple fins 12, and multiple fins 12 are grouped in pairs to form multiple groups. The two fins 12 in each group are respectively located on both sides of the main body 11, and the multiple groups of fins 12 are spaced apart along the length direction of the main body 11. When the tabs are welded to the upper surface of the adapter 30, the two fins 12 of the corresponding group are folded upward and cover the corresponding tabs. Figure 2 As shown. Through the above arrangement, the fin 12 is a split structure and is arranged corresponding to the pole ear, which can reduce the material consumption of the fin 12, thereby reducing the manufacturing cost. Figure 2 As shown, the main body 11 is provided with an exhaust hole 15, and the exhaust hole 15 is arranged corresponding to the explosion-proof valve 60 of the battery cell 100. The plurality of fins 12 are arranged at intervals, and the exhaust hole 15 can be avoided, so that the exhaust hole 15 can correspond to the explosion-proof valve 60 up and down without obstruction, thereby ensuring the normal use of the explosion-proof valve 60, and further ensuring the safety of the secondary battery.

[0033] In an optional embodiment, there are two fins 12, and the two fins 12 are respectively located on both sides of the main body 11. In other words, the fins 12 are an integrated strip structure, thereby improving the structural strength and thus improving the service life. Of course, the fins 12 are provided with avoidance gaps corresponding to the exhaust holes 15 to avoid the exhaust holes 15.

[0034] like Figure 1 to Figure 2 As shown, the main body 11 is provided with a first avoidance hole 111 for avoiding the tab, so that the tab passes through the insulating gasket and is connected to the adapter plate 30 of the cell top cover structure. Specifically, the tab of the cell 100 extends upward and passes through the first avoidance hole 111, reaches the top of the adapter plate 30 and folds over, thereby being welded to the upper surface of the adapter plate 30.

[0035] In the present embodiment, there are a plurality of first avoidance holes 111, and the plurality of first avoidance holes 111 are divided into a plurality of groups. The plurality of groups of first avoidance holes 111 are arranged at intervals along the length direction of the main body 11, and each group of first avoidance holes 111 includes at least one first avoidance hole 111. Specifically, the secondary battery includes at least one battery cell 100, and the battery cell 100 has a positive pole tab and a negative pole tab. The plurality of groups of first avoidance holes 111 are respectively a positive pole tab avoidance hole group and a negative pole tab avoidance hole group, and each first avoidance hole 111 is arranged in one-to-one correspondence with the tab. Further, in the present embodiment, there are two groups of fins 12, which correspond to the positive pole tab and the negative pole tab of the battery cell 100, respectively, and each group of fins 12 covers the positive pole tab and the negative pole tab of the battery cell 100, respectively.

[0036] like Figure 1 to Figure 2 As shown, the insulating gasket also includes a first rubber strip 13. The first rubber strip 13 is arranged on the main body 11, and is used to bond and fix the main body 11 to the adapter sheet 30 of the battery cell top cover structure. In this embodiment, there are multiple first rubber strips 13, and the multiple first rubber strips 13 are divided into multiple groups. The multiple groups of first rubber strips 13 are arranged at intervals along the length direction of the main body 11, and each group of first rubber strips 13 includes at least one first rubber strip 13.

[0037] like Figure 1 to Figure 2 As shown, the insulating gasket also includes a second adhesive strip 14. The second adhesive strip 14 is arranged on the fin 12, and is used to bond and fix the fin 12 and the adapter sheet 30 of the cell top cover structure. Specifically, after the tab is welded to the upper surface of the adapter sheet 30, the fin 12 is folded upward, and then bonded to the adapter sheet 30 through the second adhesive strip 14. Furthermore, in order to improve the fixing effect, the second adhesive strip 14 is located at one end of the fin 12 away from the main body 11, that is, close to the extended end of the fin 12.

[0038] like Figure 3As shown, the present application also provides a battery cell top cover structure, including a top cover, a transfer sheet 30 and the above-mentioned insulating gasket 10. The top cover includes a top cover sheet 20, and the top cover sheet 20 is used to connect with the housing 90 of the secondary battery. A pole 40 is arranged on the transfer sheet 30, and the transfer sheet 30 is connected to the pole ear, and the pole 40 is fixedly connected to the top cover. The insulating gasket 10 is arranged between the transfer sheet 30 and the battery cell 100.

[0039] like Figure 3 As shown, the top cover also includes a positioning block 50. The top cover sheet 20 is provided with a receiving groove and a second avoidance hole connected to the receiving groove, at least a portion of the positioning block 50 is accommodated in the receiving groove, the positioning block 50 is provided with a connecting hole 51, the pole 40 passes through the second avoidance hole and the connecting hole 51 in sequence and protrudes from the top surface of the positioning block 50, and the pole 40 is welded to the positioning block 50. Specifically, the second avoidance hole and the connecting hole 51 are coaxially arranged up and down. The receiving groove is provided on the upper surface of the top cover sheet 20, the lower part of the positioning block 50 is accommodated in the receiving groove, and the upper part is exposed outside the receiving groove, or the positioning block 50 is accommodated in the receiving groove as a whole. Through the above arrangement, the gap between the top cover sheet 20 and the insulating gasket 10 can be reduced, thereby avoiding the existence of vibration space after the pole ear is welded to the upper surface of the adapter sheet 30, and the weld print is easy to loosen during the vibration process, increasing the risk of insulation failure, and affecting the safety of the battery cell 100.

[0040] It can be understood that the positioning block 50 is made of metal material. Furthermore, the positioning block 50 and the pole 40 are made of the same material to improve the welding effect and avoid electrochemical corrosion.

[0041] like Figure 3 As shown, the top cover further includes an upper plastic 70 . The upper plastic 70 is disposed in the receiving groove, thereby isolating the positioning block 50 from the top cover sheet 20 .

[0042] In this embodiment, there are two poles 40, one is a positive pole and the other is a negative pole, and accordingly, there are also two adapters 30 and two positioning blocks 50. Two groups of fins 12 are located between the positive and negative poles to avoid interference. Further, in this embodiment, the explosion-proof valve 60 is located in the middle between the two positioning blocks 50, and accordingly, the exhaust hole 15 is also located in the middle of the main body 11, that is, between the two groups of first avoidance holes 111.

[0043] In this embodiment, the upper surface of the adapter plate 30 is provided with a sunken table surface for welding with the tab, and the lower surface is a flat surface for bonding with the insulating gasket 10 .

[0044] like Figure 3As shown, the battery cell top cover structure also includes a seal 80. The pole 40 has a step surface, and the seal 80 is sleeved on the step surface and is located between the pole 40 and the positioning block 50. Specifically, the pole 40 has a reduced diameter section to form a step surface. The diameter of the reduced diameter section is adapted to the connection hole 51, and the aperture of the second avoidance hole is larger than the aperture of the connection hole 51. When the reduced diameter section extends into the connection hole 51, the bottom surface of the positioning block 50 presses the seal 80, ensuring that the seal 80 is effectively pressed and maintaining a certain amount of compression, so that the battery cell 100 has good sealing. By providing the seal 80, the sealing between the pole 40 and the positioning block 50 can be improved, and impurities such as water and dust can be prevented from entering the battery cell 100, thereby ensuring the safety of the battery cell 100.

[0045] In this embodiment, the sealing member 80 is a rubber sealing ring.

[0046] like Figure 4 As shown, the present application also provides a secondary battery, including a shell 90, a battery cell 100 and the above-mentioned battery cell top cover structure. The battery cell top cover structure and the battery cell 100 are accommodated in the shell 90, and the top cover sheet 20 is connected to the shell 90. Specifically, the top cover sheet 20 and the shell 90 are welded.

[0047] In a specific embodiment, the secondary battery includes four stacked battery cells 100, and accordingly, the secondary battery has four positive pole tabs and four negative pole tabs, wherein the pole tabs of the two battery cells 100 located on the outside are located on the outside of the battery cell 100 along the length direction, and the two battery cells 100 located on the inside are located on the inside of the battery cell 100 along the length direction. Accordingly, there are two groups of first avoidance holes 111, and each group of first avoidance holes 111 includes four first avoidance holes 111, and the four first avoidance holes 111 are arranged at intervals along the width direction of the main body 11, wherein there is a certain interval between two adjacent first avoidance holes 111 located on the outside, and two adjacent first avoidance holes 111 located on the inside are relatively close. Furthermore, there are four first rubber strips 13, and each first rubber strip 13 is arranged between two adjacent first avoidance holes 111 having a certain interval, such as Figure 1 shown.

[0048] In this embodiment, the insulating gasket 10 is bonded to the battery cell 100 by adhesive. The insulating gasket 10 is bonded after the tab die-cutting process. Even if burrs are generated during the tab die-cutting process, the burrs can be isolated and protected by the insulating gasket 10, and will not affect the battery cell diaphragm during use, thereby improving the reliability of the product and reducing the risk of short circuit in the battery cell 100.

[0049] like Figure 4 As shown, the secondary battery further includes an insulating sheet 110 , which is disposed between the battery cell 100 and the inner wall of the shell 90 , and is used to insulate and isolate the battery cell 100 from the shell 90 .

[0050] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: by arranging an insulating gasket to support the adapter 30, and arranging an upwardly foldable fin 12 on the insulating gasket, when the pole ear is welded to the upper surface of the adapter 30, the fin 12 is folded to cover the pole ear, thereby replacing the lower plastic to isolate the pole ear and the top cover sheet 20. This not only improves the space utilization rate between the battery cell 100 and the top cover, but also effectively insulates and protects the adapter 30 and the battery cell 100, the pole ear and the top cover sheet 20, thereby ensuring the overall insulation of the secondary battery and greatly reducing the risk of insulation failure of the secondary battery.

[0051] 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.

[0052] 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.

[0053] 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. An insulating gasket, characterized in that: include: A main body (11); A fin (12), the fin (12) being arranged on a side of the main body (11) in a length direction and used for being folded upwards and covering a lug of the battery cell (100).

2. The insulating gasket according to claim 1, characterized in that: There are a plurality of fins (12), and the plurality of fins (12) are grouped in pairs to form a plurality of groups, and the two fins (12) in each group are respectively located on both sides of the main body (11), and the plurality of groups of fins (12) are arranged at intervals along the length direction of the main body (11).

3. The insulating gasket according to claim 1, characterized in that: There are two fins (12), and the two fins (12) are respectively located on two sides of the main body (11).

4. The insulating gasket according to claim 1, characterized in that: The main body (11) is provided with a first avoidance hole (111) for avoiding the pole ear, so that the pole ear passes through the insulating gasket and is connected to the adapter plate (30) of the battery cell top cover structure.

5. The insulating gasket according to claim 1, characterized in that: The insulating gasket also includes a first rubber strip (13), which is arranged on the main body (11) and is used to bond and fix the main body (11) and the adapter sheet (30) of the battery cell top cover structure.

6. The insulating gasket according to claim 1, characterized in that: The insulating gasket also includes a second rubber strip (14), which is arranged on the fin (12) and is used to bond and fix the fin (12) and the adapter sheet (30) of the battery cell top cover structure.

7. The insulating gasket according to claim 1, characterized in that: The main body (11) is provided with an exhaust hole (15), and the exhaust hole (15) is arranged corresponding to the explosion-proof valve (60) of the battery cell (100).

8. A battery cell top cover structure, characterized in that: include: A top cover, the top cover comprising a top cover sheet (20), the top cover sheet (20) being used to be connected to a housing (90) of a secondary battery; An adapter plate (30), wherein a pole (40) is arranged on the adapter plate (30), the adapter plate (30) is connected to the pole lug, and the pole (40) is connected and fixed to the top cover; The insulating gasket (10) according to any one of claims 1 to 7, wherein the insulating gasket (10) is arranged between the adapter (30) and the battery cell (100).

9. The battery cell top cover structure according to claim 8, characterized in that: The top cover also includes a positioning block (50), the top cover sheet (20) is provided with a receiving groove and a second avoidance hole communicated with the receiving groove, at least a portion of the positioning block (50) is received in the receiving groove, the positioning block (50) is provided with a connecting hole (51), the pole (40) passes through the second avoidance hole and the connecting hole (51) in sequence and protrudes from the top surface of the positioning block (50), and the pole (40) is welded to the positioning block (50); The battery cell top cover structure also includes a sealing member (80); the pole (40) has a step surface; the sealing member (80) is sleeved on the step surface and is located between the pole (40) and the positioning block (50).

10. A secondary battery, characterized in that: It comprises a shell (90), a battery cell (100) and a battery cell top cover structure according to any one of claims 8 to 9, wherein the battery cell top cover structure and the battery cell (100) are accommodated in the shell (90), and the top cover sheet (20) is connected to the shell (90).

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