Chip structure and cylindrical power battery

Abstract

The utility model discloses a chip structure and a cylindrical power battery, the chip structure is used for the cylindrical power battery, a pole is arranged on a top cover of the cylindrical power battery, a through hole is formed in the pole, and a pressure release valve is mounted at the through hole. The bar structure comprises a bar and a blowout prevention structure, a first end of the bar is used for being welded on a pole, and a mounting hole penetrating through the bar is formed in the first end of the bar; the blowout prevention structure is mounted at the mounting hole of the bar piece, the blowout prevention structure is configured to face the pressure release valve so as to prevent molten substances in the battery from being sprayed out, a plurality of vent holes are formed in the blowout prevention structure, and the vent holes are configured to allow gas generated when the pressure release valve releases pressure to be discharged outwards. The power battery module not only can avoid the problem that pressure relief and exhaust of the battery are affected due to the fact that the sheet blocks the pressure relief valve, but also can prevent the problem that high-temperature molten substances in the battery are directly sprayed during pressure relief to cause chain firing of other batteries / damage to a circuit board and the like, and the safety risk of the power battery module is reduced.

Description

Technical Field

[0001] The present application relates to the field of secondary batteries, and in particular to a bar structure and a cylindrical power battery. Background Art

[0002] At present, cylindrical batteries such as lithium-ion and sodium-ion batteries have gradually become mainstream products in the new energy vehicle industry due to their high energy density, good capacity consistency, and ability to support high-rate charge and discharge. More and more manufacturers are pursuing the simplification of cylindrical battery top cover structures to reduce production costs and increase battery energy density. However, there are the following common problems:

[0003] 1. In order to reduce costs (save sealing rings), a pressure relief valve is set on the surface of the pole of the cylindrical power battery top cover. However, when the battery is assembled into a module, the conventional busbar blocks the pressure relief valve and affects the pressure relief and exhaust.

[0004] 2. When the pressure relief valve is opened to release pressure, the high-temperature molten material inside the battery may be directly ejected, causing chain fires in other batteries / circuit board damage, etc., bringing unknown safety risks to the power battery module. Utility Model Content

[0005] The purpose of the present application is to provide a bar structure and a cylindrical power battery, which can avoid the problem of battery pressure relief and exhaust being affected by blocking the pressure relief valve, and at the same time prevent the high-temperature molten material inside the battery from being directly sprayed out during pressure relief, causing other battery chain fires / circuit board damage and other problems.

[0006] In order to achieve the above-mentioned object, the present application provides a flap structure for a cylindrical power battery, wherein a pole is provided on the top cover of the cylindrical power battery, a through hole is formed on the pole, and a pressure relief valve is installed at the through hole, and the flap structure includes:

[0007] A tab, wherein the first end of the tab is used for welding on the pole, and the first end of the tab is formed with a mounting hole penetrating the tab;

[0008] A blowout prevention structure is installed at the installation hole of the bar, and the blowout prevention structure is configured to face the pressure relief valve to prevent the molten material inside the battery from spraying out. A plurality of vents are opened on the blowout prevention structure, and the vents are configured to allow gas to be discharged outward when the pressure relief valve releases pressure.

[0009] Optionally, the blowout prevention structure includes a main body portion located at the mounting hole, a mounting portion extends outwardly from an outer edge of the main body portion, and the mounting portion is mounted on a bottom edge of the mounting hole.

[0010] Optionally, a sinking groove is formed at the bottom edge of the mounting hole, the mounting portion is mounted in the sinking groove, and the bottom surface of the mounting portion is not higher than the bottom surface of the bar piece.

[0011] Optionally, the blowout prevention structure is formed by sinking to form a sinking area located in the middle, the mounting portion located at the periphery, and a surrounding wall connecting the sinking area and the mounting portion, and the sinking area and the surrounding wall form the main body; the sinking area is vertically away from the pressure relief valve compared to the mounting portion.

[0012] Optionally, the sunken area extends upward beyond the upper surface of the bar.

[0013] Optionally, the sunken area is parallel to the bar piece or flush with the upper surface of the bar piece.

[0014] Optionally, the vent hole is opened in the sinking area.

[0015] Optionally, the surrounding wall of the main body is adapted to the through hole.

[0016] Optionally, the anti-blowout structure is made of a copper-aluminum alloy sheet, including an aluminum layer and a copper layer, the aluminum layer faces outwards, and the copper layer faces inwards; the mounting portion is welded to the bottom edge of the mounting hole.

[0017] In order to achieve the above object, the present application also provides a cylindrical power battery, including the bar structure and the top cover as described above;

[0018] The top cover is provided with a pole, a through hole is formed on the pole, a pressure relief valve is installed at the through hole, the first end of the bar is welded to the pole, the anti-blowout structure is arranged facing the pressure relief valve to prevent the molten material inside the battery from spraying out of the vent hole to allow the gas to be discharged outward when the pressure relief valve releases pressure.

[0019] In the present application, by providing a mounting hole on the bar sheet, installing a blowout prevention structure in the mounting hole, when the bar sheet is welded on the pole, the blowout prevention structure faces the pressure relief valve to block the high-temperature molten material flying out of the battery, and by providing multiple vents on the blowout prevention structure, the gas during the pressure relief valve pressure relief can be discharged outward through the vents. In other words, the present application can not only avoid the problem of the bar sheet blocking the pressure relief valve and affecting the pressure relief and exhaust of the battery by providing a blowout prevention structure with vents on the bar sheet, but also prevent the high-temperature molten material inside the battery from directly spraying out during pressure relief, causing other battery chain fires / circuit board damage and other problems, thereby reducing the safety risks of the power battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the bar structure of an embodiment of the present application.

[0021] Figure 2 This is a schematic diagram of the decomposed structure of the bar structure of an embodiment of the present application.

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the bar structure of an embodiment of the present application.

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the flap structure and the top cover structure when assembled according to the embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to explain the technical content, structural features and achieved effects of the present application in detail, the following is a detailed description in combination with the implementation methods and the accompanying drawings.

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0026] See also Figures 1 to 4 The embodiment of the present application discloses a tab structure 1 for a cylindrical power battery. A pole 21 is provided on a top cover 2 of the cylindrical power battery, a through hole 22 is formed on the pole 21, and a pressure relief valve 3 is installed at the through hole 22.

[0027] The bar structure 1 includes a bar 11 and a blowout prevention structure 12. The first end of the bar 11 is used for welding on the pole 21, and the first end of the bar 11 is formed with a mounting hole 13 that penetrates the bar 11. The blowout prevention structure 12 is installed at the mounting hole 13 of the bar 11, and the blowout prevention structure 12 is configured to face the pressure relief valve 3 to prevent the molten material inside the battery from being sprayed out. The blowout prevention structure 12 is provided with a plurality of vents 14, and the vents 14 are configured to allow the gas to be discharged outward when the pressure relief valve 3 is depressurized.

[0028] In the present application, by providing a mounting hole 13 on the bar 11, installing a blowout prevention structure 12 in the mounting hole 13, when the bar 11 is welded on the pole 21, the blowout prevention structure 12 faces the pressure relief valve 3 to block the high-temperature molten material flying out of the battery, and by providing a plurality of vents 14 on the blowout prevention structure 12, the gas during the pressure relief valve 3 pressure relief can be discharged outward through the vents 14. In other words, the present application can not only avoid the problem of the bar 11 blocking the pressure relief valve 3 and affecting the pressure relief and exhaust of the battery by providing the blowout prevention structure 12 with vents 14 on the bar 11, but also prevent the high-temperature molten material inside the battery from directly spraying out during pressure relief, causing other battery chain fires / circuit board damage and other problems, thereby reducing the safety risk of the power battery module.

[0029] In some embodiments, the blowout prevention structure 12 includes a main body 121 located at the mounting hole 13, and a mounting portion 122 extends outward from the outer edge of the main body 121, and the mounting portion 122 is mounted on the bottom edge of the mounting hole 13. It can be understood that the blowout prevention structure 12 composed of the main body 121 and the mounting portion 122 is only a specific form of the blowout prevention structure 12, and the blowout prevention structure 12 of the present application is not limited to the above form, as long as the depressurized gas is allowed to be discharged and when the molten material is ejected, it can play a role in blocking the ejected molten material.

[0030] Specifically, a sinking groove 111 is formed at the bottom edge of the mounting hole 13, and the mounting portion 122 is mounted in the sinking groove 111, and the bottom surface of the mounting portion 122 is flush with the bottom surface of the bar piece 11. By forming the sinking groove 111 at the bottom of the mounting hole 13 to match the mounting portion 122, the bottom surface of the mounting portion 122 is flush with the bottom surface of the bar piece 11. When the bar piece 11 is welded to the pole 21, it can avoid that the bar piece 11 cannot be reliably welded to the pole 21 because the mounting portion 122 exceeds the bottom surface of the bar piece 11 downward, and the installation reliability of the anti-spray structure 12 can be ensured by clamping the bar piece 11 and the pole 2. Of course, the mounting portion 122 is not limited to this installation method. In a specific example, the width W of the sinking groove 111 is preferably 0.5 to 1.5 mm. Of course, it is not limited to this.

[0031] Of course, the bottom surface of the mounting portion 122 and the bottom surface of the tab 11 are not limited to being flush with each other. In other embodiments, the bottom surface of the mounting portion 122 is lower than the bottom surface of the tab 11 .

[0032] Specifically, the blowout prevention structure 12 is sunken to form a sunken area 123 in the middle, a mounting portion 122 at the periphery, and a surrounding wall 124 connecting the sunken area 123 and the mounting portion 122. The sunken area 123 and the surrounding wall 124 form a main body 121. The sunken area 123 is vertically farther from the pressure relief valve 3 than the mounting portion 122. The setting of the sunken area 123 is conducive to ensuring the use effect of the blowout prevention structure 12.

[0033] More specifically, in order to better ensure the use effect of the anti-blowout structure 12 , the sinking area 123 extends upward beyond the upper surface of the bar piece 11 or is flush with the upper surface of the bar piece 11 .

[0034] More specifically, the sunken area 123 is parallel to the bar 11 .

[0035] In a specific example, the height H of the anti-spray structure 12 is ≥ the thickness h of the bar sheet 11, so that when the mounting portion 122 is mounted in a manner such that the bottom surface is flush with the bottom surface of the bar sheet 11, the sinking area 123 is upwardly protruding from the upper surface of the bar sheet 11 or is flush with the upper surface of the bar sheet 11. The height H of the anti-spray structure 12 refers to the distance between the sinking area 123 and the surfaces of the mounting portion 122 that are away from each other. In a specific example, the thickness h of the bar sheet 11 is preferably 1.0 to 2.0 mm.

[0036] In a specific example, the sinking area 123 is in the shape of a disk as a whole, and the mounting portion 122 is in the shape of a ring as a whole. Of course, the shape of the anti-blowout structure 12 is not limited to this.

[0037] More specifically, the vent hole 14 is opened in the sinking area 123. Of course, the location of the vent hole 14 is not limited thereto.

[0038] Specifically, the surrounding wall 124 of the main body 121 is adapted to the through hole 22 .

[0039] In some embodiments, the blowout prevention structure 12 is made of a copper-aluminum alloy sheet, including an aluminum layer and a copper layer, the aluminum layer faces outward and the copper layer faces inward, that is, toward the pressure relief valve 3; the mounting portion 122 is welded to the bottom edge of the mounting hole 13, that is, welded to the bar sheet 11 through the aluminum layer.

[0040] It should be understood that the material of the anti-blowout structure 12 is not limited to copper-aluminum alloy, and other materials such as steel sheets may also be used.

[0041] Specifically, the material of the bar piece 11 is aluminum. Of course, the material of the bar piece 11 is not limited thereto.

[0042] The embodiment of the present application also discloses a cylindrical power battery, including the tab structure 1 and the top cover 2 as described above; a pole 21 is provided on the top cover 2, a through hole 22 is formed on the pole 21, a pressure relief valve 3 is installed at the through hole 22, a first end of the tab 11 is welded to the pole 21, a blowout prevention structure 12 is arranged facing the pressure relief valve 3 to prevent the molten material inside the battery from spraying out, and the vent hole 14 allows the gas to be discharged outward when the pressure relief valve 3 releases pressure.

[0043] The following briefly describes an optional assembly method for a cylindrical power battery to facilitate understanding of the present application.

[0044] First, the battery is assembled and produced in the usual way.

[0045] Next, the installation portion 16 of the anti-blowout structure 12 is matched and installed with the sinking groove 111 of the bar plate 11. If the anti-blowout structure 12 is made of a copper-aluminum alloy sheet, the two can be welded and fixed. If the anti-blowout structure 12 is made of a steel sheet, welding and fixing are not required.

[0046] Next, the bar plate 11 and the anti-blowout structure 12 are arranged on the pole 21 , wherein the anti-blowout structure 12 is located directly above the pressure relief valve 3 , and the bar plate 11 and the pole 21 are fixed by laser welding.

[0047] The above disclosure is only a preferred example of the present application, and its role is to facilitate the technical personnel in this field to understand and implement it. Of course, it cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the scope of the patent application of the present application still fall within the scope covered by the present application.

Claims

1. A tab structure for a cylindrical power battery, wherein a pole is provided on the top cover of the cylindrical power battery, a through hole is formed on the pole, and a pressure relief valve is installed at the through hole, characterized in that: The bar structure comprises: A tab, wherein the first end of the tab is used for welding on the pole, and the first end of the tab is formed with a mounting hole penetrating the tab; A blowout prevention structure is installed at the installation hole of the bar, and the blowout prevention structure is configured to face the pressure relief valve to prevent the molten material inside the battery from spraying out. A plurality of vents are opened on the blowout prevention structure, and the vents are configured to allow gas to be discharged outward when the pressure relief valve releases pressure.

2. The bar structure according to claim 1, characterized in that: The anti-blowout structure comprises a main body portion located at the mounting hole, a mounting portion extending outwardly from an outer edge of the main body portion, and the mounting portion is mounted on a bottom edge of the mounting hole.

3. The bar structure according to claim 2, characterized in that: A sinking groove is formed at the bottom edge of the mounting hole, the mounting portion is mounted in the sinking groove, and the bottom surface of the mounting portion is not higher than the bottom surface of the bar piece.

4. The bar structure according to claim 2 or 3, characterized in that: The blowout prevention structure is formed by sinking to form a sinking area located in the middle, the mounting part located at the periphery, and a surrounding wall connecting the sinking area and the mounting part, and the sinking area and the surrounding wall form the main body; the sinking area is vertically away from the pressure relief valve compared to the mounting part.

5. The bar structure according to claim 4, characterized in that: The sunken area extends upward beyond the upper surface of the bar sheet or is flush with the upper surface of the bar sheet.

6. The bar structure according to claim 4, characterized in that: The sinking area is parallel to the bar.

7. The bar structure according to claim 4, characterized in that: The vent holes are provided in the sinking area.

8. The bar structure according to claim 4, characterized in that: The surrounding wall of the main body is adapted to the through hole.

9. The bar structure according to claim 2, characterized in that: The anti-blowout structure is made of a copper-aluminum alloy sheet, including an aluminum layer and a copper layer, wherein the aluminum layer faces outward and the copper layer faces inward; the mounting portion is welded to the bottom edge of the mounting hole.

10. A cylindrical power battery, characterized in that: Comprising the bar structure and the top cover as claimed in any one of claims 1 to 9; The top cover is provided with a pole, a through hole is formed on the pole, a pressure relief valve is installed at the through hole, the first end of the bar is welded to the pole, the anti-blowout structure is arranged facing the pressure relief valve to prevent the molten material inside the battery from spraying out of the vent hole to allow the gas to be discharged outward when the pressure relief valve releases pressure.

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