Flexible battery explosion-proof valve detection sensor

Abstract

The utility model discloses a flexible battery explosion-proof valve detection sensor, comprising an FPC flexible board which is provided with a detection notch corresponding to an explosion-proof valve to be detected; the FPC flexible board is provided with a detection notch, the detection sheet is accommodated in the detection notch, the detection sheet is connected with the FPC flexible board through four connecting sheets which are uniformly arranged around the detection sheet, the detection sheet is positioned in the detection notch in a suspended manner, and detection support legs are uniformly distributed on each connecting sheet; the detection sheet is used for bearing the impact force of opening the anti-explosion valve so as to enable the connecting sheet and the detection supporting leg to be broken to form a detection signal; the distance between the detection sheet and the edge of the detection notch is 1-3mm; the area of the detection sheet is 1.1-1.3 times of the area of the explosion-proof valve switch; the width of the connecting sheet is 1 to 2 mm; and in a normal state, the distance between the detection sheet and the anti-explosion valve is 1-3mm. According to the utility model, the detection is faster, and the detection timeliness and the detection effect are obviously improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery detection technical field especially, it is a kind of flexible battery explosion relief valve detection sensor. BACKGROUND

[0002] With the rapid development of energy storage technology, the application of battery is more and more extensive, so the requirement of safety and reliability of battery is higher and higher. In the process of using battery, there may be serious overcharge, battery short circuit, serious over-temperature, thermal runaway, impact or extrusion deformation and piercing, etc. These problems may cause the continuous rise of the temperature and pressure inside the battery, and when it exceeds the safety threshold, it may cause the explosion of the battery.

[0003] Battery explosion relief valve is the last explosion barrier of battery itself. When the internal pressure of battery reaches the opening threshold of safety valve, for example, the opening threshold of lithium ion battery safety valve is usually 600~800KPa. To avoid the explosion of battery, the battery explosion relief valve is opened to release pressure. When the battery explosion relief valve is opened, it means that the battery has a serious safety problem, so it is necessary to detect when the battery explosion relief valve is opened to prevent the expansion of safety accident.

[0004] At present, the existing sensor usually detects whether the explosion relief valve is in the open state by detecting the electrolyte splashed when the explosion relief valve is opened. Since the splashing direction of electrolyte has certain uncertainty, and there is certain hysteresis in detecting the electrolyte splashed on the sensor, the detection effect is affected. UTILITARY MODEL CONTENTS

[0005] In order to overcome the deficiency of prior art, the purpose of the utility model is to provide a kind of flexible battery explosion relief valve detection sensor, with the advantages of simple structure and high detection efficiency.

[0006] The purpose of the utility model is realized by the following technical scheme:

[0007] According to the first aspect of the embodiment of the present disclosure, a kind of flexible battery explosion relief valve detection sensor is provided, comprising:

[0008] FPC flexible plate, detection slot for corresponding with the explosion relief valve to be detected is opened on the FPC flexible plate;

[0009] Detection sheet housed in the detection slot, the detection sheet is connected with the FPC flexible plate by four connection pieces evenly arranged around the detection sheet, and the detection sheet is in the form of suspension in the detection slot, detection leg is arranged on each connection piece, and the detection sheet is used to receive the impact force of explosion relief valve opening to make connection piece and detection leg break and form detection signal;

[0010] The detection sheet is 1-3 mm away from the edge of the detection notch.

[0011] The area of the detection sheet is 1.1-1.3 times the area of the explosion-proof valve switch.

[0012] The width of the connecting sheet is 1-2 mm.

[0013] And in the normal state, the distance between the detection sheet and the explosion-proof valve is 1-3 mm.

[0014] The above technical solutions are implemented. When used, the FPC flexible plate is assembled to the battery, and the detection sheet corresponds to the explosion-proof valve, that is, the detection sheet is directly above the explosion-proof valve and is 1-3 mm away from the explosion-proof valve. When the battery fails to cause the explosion-proof valve to open, an upward impact force is formed and acts on the detection sheet. The detection sheet is deformed upward under the action of the impact force, and the connecting sheet and the detection leg are broken to generate a detection signal. The detection signal can be detected by the detection circuit as an opening valve signal, realizing the opening valve detection of the explosion-proof valve. By setting the appropriate distance between the detection sheet and the detection notch, the detection sheet has enough deformation space when deformed. By setting the appropriate width size of the connecting sheet, the connecting sheet needs to be stressed to be pulled off to prevent breakage failure in the normal use state or during transportation. By setting the appropriate area ratio of the detection sheet, the detection sheet can reasonably receive the impact force generated when the explosion-proof valve opens, ensuring that the detection sheet can have enough displacement deformation under the action of the impact force, realizing the breakage of the detection leg to complete the detection. Since the opening valve detection is performed by directly receiving the impact force, the detection is more rapid than the detection of the electrolyte, significantly improves the detection timeliness, provides a faster response for subsequent signal processing, and improves the detection effect.

[0015] In some exemplary embodiments, the detection sheet is provided in an elliptical shape, and the detection notch is an elliptical shape matched with the detection sheet.

[0016] The above technical solutions are implemented. The elliptical shape can be better matched with the explosion-proof valve and can more completely receive the impact force to make the connecting sheet and the detection leg break to realize the opening valve detection.

[0017] In some exemplary embodiments, each detection leg forms a detection loop with the connecting sheet and the detection sheet and is connected with the detection circuit. When any detection leg breaks, the resistance value of the detection circuit changes to form a detection signal.

[0018] The above technical solutions are implemented. When any detection leg breaks, the resistance connected with the detection leg is disconnected, so that the resistance value of the entire detection circuit changes, thereby forming a detection signal to complete the opening valve detection.

[0019] In some exemplary embodiments, the connecting pieces are arranged along the extension direction of the detection pieces along the long axis or the short axis, respectively.

[0020] The above technical solution is implemented, so that the connecting pieces are more likely to be broken under stress, and the detection accuracy is improved.

[0021] In some exemplary embodiments, the thickness of the FPC flexible plate is 0.08-0.15 mm.

[0022] The above technical solution is implemented, and since the FPC flexible plate is usually made of a polyimide or polyester film substrate, by setting a suitable plate thickness, the connecting pieces have suitable stress-bearing performance, so that the detection pieces can be broken to achieve valve opening detection after bearing a suitable impact force.

[0023] In summary, compared with the prior art, the utility model has the following beneficial effects:

[0024] In the utility model embodiment, the FPC flexible plate is assembled to the battery during use, and the detection piece corresponds to the explosion-proof valve, that is, the detection piece is located directly above the explosion-proof valve and is 1-3 mm away from the explosion-proof valve. When the explosion-proof valve is opened due to a fault of the battery, an upward impact force is formed and acts on the detection piece. The detection piece is deformed upward under the action of the impact force, and then the connecting piece and the detection leg are broken to generate a detection signal. The detection signal can be detected by the detection circuit as an open valve signal, so that the open valve detection of the explosion-proof valve is realized. By setting a suitable distance between the detection piece and the detection slot, the detection piece has enough deformation space when it is deformed. By setting a suitable width size of the connecting piece, the connecting piece needs to bear a certain stress to be pulled off. The breaking failure in the normal use state or the transportation process is prevented. By setting a suitable area ratio of the detection piece and a suitable distance between the detection piece and the explosion-proof valve, the detection piece can reasonably bear the impact force generated when the explosion-proof valve is opened. It is ensured that the detection piece can be deformed enough when it is subjected to the impact force, so that the detection leg is broken to complete the detection. Since the open valve detection is performed by directly bearing the impact force, the detection is more rapid than the detection of the electrolyte, the detection timeliness is significantly improved, a faster response is provided for subsequent signal processing, and the detection effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a structural schematic view of a flexible battery explosion-proof valve detection sensor in the utility model embodiment.

[0026] Figure 2 FIG. 2 is a layout schematic view of a detection leg in the utility model embodiment.

[0027] Figure 3 Figure 1 is a structural schematic diagram of a detection plate group prepared by a processing method in the embodiments of the present application.

[0028] Figure 4 Figure 2 is a structural schematic diagram of different detection piece shapes in the comparative experiments of the present application.

[0029] Corresponding component names represented by numbers and letters in the figure:

[0030] 10, FPC flexible plate; 11, detection notch; 20, detection piece; 21, connecting piece; 22, detection leg. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] As shown in Figure 1 and Figure 2 , the present application embodiment first aspect provides a flexible battery explosion-proof valve detection sensor, comprising: FPC flexible plate 10, FPC flexible plate 10 is provided with detection notch 11 corresponding to the detection of the explosion-proof valve; detection piece 20 accommodated in the detection notch 11, detection piece 20 is connected with FPC flexible plate 10 through four connecting pieces 21 evenly arranged around detection piece 20, and detection piece 20 is in a suspended state in detection notch 11, each connecting piece 21 is arranged with detection leg 22, and detection piece 20 is used for receiving the impact force of the explosion-proof valve opening to make the connecting piece 21 and the detection leg 22 break to form a detection signal.

[0033] Specifically, the distance between detection piece 20 and the edge of detection notch 11 is 1-3mm, the area of detection piece 20 is 1.1-1.3 times the area of explosion-proof valve switch, the width of connecting piece 21 is 1-2mm, and the distance between detection piece 20 and explosion-proof valve in normal state is 1-3mm; preferably, the distance between detection piece 20 and the edge of detection notch 11 is 2mm, the area of detection piece 20 is 1.2 times the area of explosion-proof valve switch, the width of connecting piece 21 is 1.5mm, and the distance between detection piece 20 and explosion-proof valve in normal state is 2mm.

[0034] The detection piece 20 is arranged in an elliptical shape, and the detection notch 11 is also arranged in an elliptical shape matching the detection piece 20. The elliptical shape can better match the explosion-proof valve, and can more completely receive the impact force, so that the connecting piece 21 and the detection leg 22 are broken to realize the valve opening detection. The connecting piece 21 is arranged along the extension direction of the long axis or the short axis of the detection piece 20, so that the connecting piece 21 is more easily broken under force, and the detection accuracy is improved.

[0035] Each detection leg 22 forms a detection loop in the connecting piece 21 and the detection piece 20 and is connected to the detection circuit. When any detection leg 22 is broken, the resistance value of the detection circuit is changed to form a detection signal. It can be understood that the detection circuit is printed on the FPC flexible board 10 and the detection piece 20, and the detection leg 22 is connected to a detection resistor. Under normal circumstances, the detection resistor is connected in parallel to the detection circuit through the detection leg 22. When any detection leg 22 is broken, the detection resistor is disconnected, so that the resistance value of the entire detection circuit changes, thereby forming a detection signal to complete the valve opening detection.

[0036] The thickness of the FPC flexible board 10 is 0.08-0.15mm, and preferably, the thickness of the FPC flexible board 10 is 0.1mm. It can be understood that the thickness of the connecting piece 21 is consistent with the thickness of the FPC flexible board 10. Since the FPC flexible board 10 is usually made of a polyimide or polyester film substrate, by arranging a suitable board thickness, the connecting piece 21 has a suitable force bearing performance, so that the detection piece 20 can be broken to realize the valve opening detection after bearing a suitable impact force.

[0037] In use, the FPC flexible plate 10 is assembled to the battery, and the detection sheet 20 is corresponded to the explosion-proof valve, that is, the detection sheet 20 is located directly above the explosion-proof valve and is 1-3 mm away from the explosion-proof valve. When the battery fails to cause the explosion-proof valve to open, an upward impact force is formed and acts on the detection sheet 20. The detection sheet 20 is deformed upward under the action of the impact force, and then the connecting sheet 21 and the detection leg 22 are broken to generate a detection signal. The detection signal can be detected by the detection circuit as an opening valve signal, so that the opening valve detection of the explosion-proof valve is realized. By setting the appropriate distance between the detection sheet 20 and the detection slot 11, the detection sheet 20 can have enough deformation space when deformed. By setting the appropriate width size of the connecting sheet 21, the connecting sheet 21 needs a certain stress to be pulled off to prevent breakage failure in the normal use state or in the transportation process. By setting the appropriate area ratio of the detection sheet 20 and the appropriate distance between the detection sheet 20 and the explosion-proof valve, the detection sheet 20 can reasonably receive the impact force generated when the explosion-proof valve is opened, so that the detection sheet 20 can have enough displacement deformation under the action of the impact force, and the detection leg 22 is broken to complete the detection. Since the opening valve detection is directly received by the impact force, the detection is more rapid than the detection of the electrolyte, the detection timeliness is significantly improved, the signal processing is faster, and the detection effect is improved.

[0038] In order to verify the specific detection function of different sensor size structures, the following comparative experiments are provided for illustration:

[0039] Comparative experiment one

[0040] The size ratio of the detection sheet and the explosion-proof valve is set to test the breaking probability of the connecting sheet. Specifically, the size ratio of the detection sheet and the explosion-proof valve is set to 0.8:1, 1:1 and 1.2:1. Then the sensor is correspondingly arranged with the explosion-proof valve to perform the opening valve test, so as to determine the opening probability of different sensors. The specific test results are as follows:

[0041] Size ratio of detection sheet and explosion-proof valve 0.8:1 1:1 1.2:1 Probability of blowout 70% 90% 100%

[0042] According to the test results, when the size ratio of the detection sheet and the explosion-proof valve is greater than 1.2, 100% of the detection sheet can be triggered to open.

[0043] Comparative experiment two

[0044] Different detection sheet shapes are set to test the breaking force and breaking probability of the connecting sheet. Specifically, as shown in Figure 4 , a~g different detection sheet and connecting sheet setting forms are set. Then the sensor is correspondingly arranged with the explosion-proof valve to perform the opening valve test, so as to determine the opening probability of different sensors. The specific test results are as follows:

[0045] Sensor a b c d e f g Blowout force 43N 15N 30N 15N 50N 15N 10N Probability of blowout 70% 50% 40% 30% 70% 100% 80%

[0046] As can be seen from the test results, Figure 4 The sensor shape shown in -f is optimal and ensures 100% triggering of the detection piece to break open under a 15N impact force. Therefore, setting this detection piece shape and the arrangement of the connecting pieces can ensure effective breakage without causing damage or misjudgment due to insufficient force.

[0047] Comparative Experiment 3

[0048] The breaking force of the connecting piece was tested by setting up different FPC flexible board thicknesses. Specifically, FPC flexible boards with thicknesses of 0.05mm, 0.1mm, 0.2mm, and 0.3mm were set up. Then, the sensor was set up with the explosion-proof valve accordingly, and valve opening tests were performed to determine the breaking force of different sensors. The specific test results are as follows:

[0049] FPC flexible board thickness 0.05 mm 0.1 mm 0.2 mm 0.3 mm Blowout force 3N 15N 25N 30N

[0050] The test results show that when the thickness of the FPC flexible board is 0.1mm, the connecting piece can be effectively broken under the action of a 15N breaking force, while also preventing the sensor from being too easily triggered to short circuit.

[0051] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of this utility model, and all of these fall within the protection scope of this utility model.

Claims

1. A flexible battery explosion-proof valve detection sensor, characterized in that, include: The FPC flexible board has a detection slot corresponding to the explosion-proof valve to be tested. The detection piece is housed in the detection slot. The detection piece is connected to the FPC flexible board by four connecting pieces evenly arranged around the detection piece. The detection piece is suspended in the detection slot. Each connecting piece is provided with a detection leg. The detection piece is used to withstand the impact force of the explosion-proof valve opening, so that the connecting piece and the detection leg break to form a detection signal. The detection piece is 1-3 mm away from the edge of the detection slot; The area of ​​the detection plate is 1.1-1.3 times the area of ​​the explosion-proof valve switch; The width of the connecting piece is 1-2mm; Under normal conditions, the distance between the detection plate and the explosion-proof valve is 1-3mm.

2. The flexible battery explosion-proof valve detection sensor according to claim 1, characterized in that, The detection strip is elliptical in shape, and the detection slot is elliptical in shape to fit the detection strip.

3. The flexible battery explosion-proof valve detection sensor according to claim 1 or 2, characterized in that, Each of the detection pins forms a detection loop within the connecting piece and the detection piece and is connected to the detection circuit. When any of the detection pins breaks, the resistance value of the detection circuit is changed to generate a detection signal.

4. The flexible battery explosion-proof valve detection sensor according to claim 2, characterized in that, The connecting pieces are respectively disposed along the extension direction of the detection piece along the major axis or the minor axis.

5. The flexible battery explosion-proof valve detection sensor according to claim 1, characterized in that, The thickness of the FPC flexible sheet is 0.08-0.15 mm.

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