A device for detecting leakage of a metal can battery

Abstract

The present application relates to the field of battery, especially a kind of detection device for detecting liquid leakage of metal shell battery, the device is arranged on the metal shell of battery, the device includes: bottom insulating layer, intermediate metal layer and top insulating layer are sequentially arranged from bottom to top;The outer periphery of intermediate metal layer is exposed on the outside of the device to contact liquid leakage;Intermediate metal layer has first collection end, and the first collection end extends to the outer surface of top insulating layer;The outer periphery of top insulating layer is provided with the outwardly extending extension, and the extension is provided with metal piece, the metal piece does not contact intermediate metal layer, the bottom of metal piece is exposed on the bottom surface of top insulating layer to contact metal shell, and the second collection end of metal piece extends to the outer surface of top insulating layer.The structure of the device improves the timeliness and accuracy of detection result.

Description

Technical Field

[0001] This invention relates to the field of batteries, and in particular to a detection device for detecting leakage in metal-cased batteries. Background Technology

[0002] The rapid development of new energy fields (such as electric vehicles and energy storage power stations) has led to the application of electrochemical batteries such as lithium-ion power batteries and lead-acid batteries. Electric vehicles and energy storage power stations require a large number of batteries connected in parallel and / or series to form high-voltage battery packs. Due to the large number of batteries, substandard manufacturing processes, and misuse, battery safety issues are becoming increasingly prominent, with battery leakage being a significant problem. Battery leakage refers to the outflow of liquid from the battery's internal components, such as the safety valve or other joints. Battery leakage significantly impacts battery performance and, in severe cases, can cause a short circuit. A short circuit is the most dangerous battery failure mode, potentially leading to battery combustion or even explosion. Therefore, battery leakage detection is crucial for safe battery operation.

[0003] In existing technologies, to ensure the safe and efficient operation of batteries, the battery status is mainly monitored and managed through a battery management module. Current battery management modules primarily monitor battery voltage, temperature, charging and discharging current, and system insulation. Only when battery leakage reaches a certain level, such as a short circuit between the battery and the battery pack, will a warning of reduced system insulation be issued, thus notifying relevant personnel to repair the battery. However, this method has limitations in the timeliness of battery leakage detection; the warning is only issued when the battery and battery pack are short-circuited, resulting in a lag in detection results and failing to promptly warn of potential battery leakage. Summary of the Invention

[0004] To address the aforementioned problems, the purpose of this invention is to provide a detection device for detecting leakage in metal-cased batteries, which can quickly detect the leakage status of batteries, reduce the lag in detection results, and provide timely feedback of detection information.

[0005] To achieve the objectives of this invention, the following technical solutions are adopted:

[0006] A detection device for detecting leakage in a metal-cased battery is provided. The device is disposed on the metal casing of the battery and includes: a bottom insulating layer, a middle metal layer, and a top insulating layer arranged sequentially from bottom to top; the outer periphery of the middle metal layer is exposed outside the device to contact the leakage; the middle metal layer has a first sampling end that extends to the outer surface of the top insulating layer; the outer periphery of the top insulating layer has a laterally outwardly extending protrusion with a metal component disposed on the protrusion, the metal component not contacting the middle metal layer, the bottom of the metal component being exposed on the bottom surface of the top insulating layer to contact the metal casing, and a second sampling end of the metal component extending to the outer surface of the top insulating layer.

[0007] Preferably, the bottom insulating layer is in the form of a sheet or plate, and the thickness of the bottom insulating layer does not exceed 2 mm.

[0008] Preferably, the outer contour of the intermediate insulating layer is similar to that of the bottom insulating layer, or slightly smaller than that of the bottom insulating layer.

[0009] Preferably, the upper part of the intermediate insulating layer is provided with an extension, which extends upward through the top insulating layer. The upper end of the extension is located on the top surface of the top insulating layer, and the upper end of the extension is the first acquisition end.

[0010] Preferably, there are multiple metal parts, which are evenly arranged circumferentially around the protrusion.

[0011] Preferably, the top of the metal part extends to the top surface of the top insulating layer, and the top of the metal part is the second acquisition end.

[0012] In summary, the advantages of this invention are: by setting an intermediate metal layer between the top and bottom insulating layers, and by setting a metal component in the top insulating layer that is not in contact with the intermediate metal layer, the resistance of the intermediate metal layer and the metal component is infinite under normal conditions. However, when leakage occurs, the intermediate metal layer and the metal component become conductive, and the resistance between them is significantly reduced. This device structure improves the timeliness and accuracy of the detection results. Attached Figure Description

[0013] Figure 1 A top view of a battery leakage detection device installed on a battery safety valve.

[0014] Figure 2 for Figure 1 Sectional view at point AA.

[0015] Figure 3 This is a cross-sectional view of a battery leakage detection device.

[0016] Figure 4 This is a top view of the intermediate metal layer. Detailed Implementation

[0017] This application provides a detection device for detecting leakage in metal-cased batteries. The device is mounted on the metal casing (or the battery safety valve), or at the seam of the battery's metal casing; that is, the device must be mounted on a conductive material (typically the metal casing). This device is used to detect leakage at these locations. In this embodiment, the device is exemplified by being mounted on the safety valve of a metal-cased battery.

[0018] Figure 1 and Figure 2A schematic diagram is shown of a battery leakage detection device installed on a battery safety valve. In this embodiment, a groove 910 is provided on the top surface of the upper battery casing 900, and the safety valve is located in the groove 910. The groove 910 has a circular cross-section. The bottom of the battery leakage detection device basically covers the entire bottom surface of the groove 910, and the top surface of the device is higher than the top surface of the groove 910 and extends outward beyond the groove 910, fitting against the outer surface of the upper battery casing 900.

[0019] Figure 3 A cross-sectional view of a battery leakage detection device is shown, revealing a layered structure comprising, from bottom to top, a bottom insulating layer 100, a middle metal layer 200, and a top insulating layer 300. For example, these insulating layers can be a PCB board; furthermore, they can be made of rigid or flexible materials. The middle metal layer 200 is made of conductive material, preferably copper or aluminum foil.

[0020] like Figure 2 and 3 As shown, the bottom insulating layer 100 is in the form of a thin sheet or plate. The outline of the bottom insulating layer 100 is basically adapted to the bottom surface of the groove 910 to cover the entire bottom surface of the groove 910. The thickness of the bottom insulating layer 100 should not be too large, usually not exceeding 2 mm, preferably 1 mm. When the insulating layer is made of a rigid material, the thickness of the bottom insulating layer and the intermediate metal layer should be considered in conjunction with the structure of the safety valve to ensure that the top insulating layer can adhere to the battery casing. The smaller thickness allows the leakage to flow above the bottom insulating layer 100 and contact the intermediate metal layer 200 if a small amount of liquid leaks into the groove 910.

[0021] like Figure 2 and Figure 3 As shown, the outer periphery of the intermediate metal layer 200 is exposed on the outside of the device, meaning that the outer periphery of the intermediate metal layer 200 is in contact with the outside air. The outline of the intermediate metal layer 200 is similar to, or slightly smaller than, the bottom insulating layer 100, so that as soon as the leaked liquid flows above the bottom insulating layer 100, it can quickly come into contact with the intermediate metal layer 200, improving the accuracy and timeliness of detection. Figure 3 and 4 As shown, in this embodiment, the intermediate metal layer 200 is circular, but it can also be annular or other thin sheet-like shapes. An extension 210 is provided on the upper part of the intermediate metal layer 200, with its upper end extending to the outer surface of the top insulating layer 300. In this embodiment, the upper end of the extension 210 is located on the top surface of the top insulating layer 100. The upper end of the extension 210 is defined as the first acquisition end.

[0022] like Figure 1 and 3As shown, the top insulating layer 300 has a larger outer contour than the bottom insulating layer 100. A laterally outwardly extending portion 310 is provided on the outer periphery of the top insulating layer 300. The bottom surface of the extending portion 310 is attached to the outer surface of the battery metal casing, and a metal element 400, preferably copper foil or aluminum foil, is provided on the extending portion 310. The bottom of the metal element 400 protrudes from the bottom surface of the extending portion 310 for contact with the outer surface of the battery metal casing. The metal element 400 has a second collecting end 410 that extends to the outer surface of the top insulating layer 300. In this embodiment, the second collecting end 410 is provided on the top surface of the top insulating layer 300. Furthermore, multiple metal elements 400 can be provided; for example, multiple metal elements 400 can be evenly arranged around the circumference of the extending portion 310.

[0023] As can be seen from the above structure, the intermediate metal layer 200 and the metal component 400 are separated by the top insulating layer 300, preventing them from contacting each other. In other words, under normal circumstances, the resistance between the intermediate metal layer 200 and the metal component 400 is infinite. However, when there is leakage in the groove 910, the leakage liquid contacts both the metal casing of the battery and the intermediate metal layer 200, thus creating a conductive connection between the intermediate metal layer 200 and the metal component 400. Consequently, the resistance between the first and second acquisition terminals 410 is significantly reduced. To measure the resistance value, the first and second acquisition terminals 410 can be connected through the battery management system.

[0024] In summary, the advantages of this invention are: by providing an intermediate metal layer 200 between the top insulating layer 300 and the bottom insulating layer 100, and by providing a metal component 400 in the top insulating layer 300 that is not in contact with the intermediate metal layer 300, the resistance of the intermediate metal layer 300 and the metal component 400 is infinite under normal conditions. However, when leakage occurs, the intermediate metal layer 300 and the metal component 400 become conductive, and the resistance between them is significantly reduced. This device structure improves the timeliness and accuracy of the detection results.

[0025] The foregoing description of embodiments of the present invention, through which those skilled in the art are able to implement or use the present invention, will be readily apparent to those skilled in the art. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. A detection device for detecting leakage in metal-cased batteries, characterized in that, The device is installed on the metal casing of the battery. A groove (910) is provided on the top surface of the upper casing (900) of the battery. The safety valve is located in the groove (910). The cross-section of the groove (910) is circular. The bottom of the battery leakage detection device basically covers the entire bottom surface of the groove (910). The top surface of the device is higher than the top surface of the groove (910) and extends outward beyond the groove (910), fitting against the outer surface of the upper casing (900) of the battery. The device includes: a bottom insulating layer (100), an intermediate metal layer (200), and a top insulating layer (300) arranged sequentially from bottom to top; the outer periphery of the intermediate metal layer (200) is exposed outside the device to contact the leaking liquid; the intermediate metal layer (200) has a first collecting end that extends to the outer surface of the top insulating layer (300); the outer periphery of the top insulating layer (300) is provided with a laterally outwardly extending protrusion (310), and a metal part (400) is provided on the protrusion (310). The metal part (400) does not contact the intermediate metal layer (200), and the bottom of the metal part (400) is exposed on the bottom surface of the top insulating layer (300) to contact the metal shell; the second collecting end (410) of the metal part (400) extends to the outer surface of the top insulating layer (300). An extension (210) is provided on the upper part of the intermediate metal layer (200). The extension (210) extends upward through the top insulating layer (300). The upper end of the extension (210) is located on the top surface of the top insulating layer (300). The upper end of the extension (210) is the first acquisition end. The top of the metal part (400) extends to the top surface of the top insulating layer (300), and the top of the metal part (400) is the second acquisition end (410). The intermediate metal layer (200) and the metal part (400) are separated by a top insulating layer (300) so that they do not come into contact. Under normal circumstances, the resistance between the intermediate metal layer (200) and the metal part (400) is infinite. However, when there is leakage in the groove (910), the leakage will come into contact with the intermediate metal layer (200) at the same time as the metal shell of the battery, thereby making the intermediate metal layer (200) and the metal part (400) conductive, thus significantly reducing the resistance between the first acquisition end and the second acquisition end (410).

2. The detection device according to claim 1, characterized in that, The bottom insulating layer (100) is in the form of a sheet or plate, and the thickness of the bottom insulating layer (100) does not exceed 2 mm.

3. The detection device according to claim 1 or 2, characterized in that, The outline of the intermediate metal layer (200) is similar to or slightly smaller than that of the bottom insulating layer (100).

4. The detection device according to claim 1, characterized in that, There are multiple metal parts (400), and they are evenly arranged around the protrusion (310) in a circumferential direction.

Images