Battery explosion-proof valve detection sensor and processing technology

Abstract

The invention discloses a battery explosion-proof valve detection sensor and a processing technology thereof, and the sensor comprises a PCB which is provided with a detection notch corresponding to a to-be-detected explosion-proof valve; the PCB is provided with a detection notch, the detection block is accommodated in the detection notch, the detection block is connected to the PCB through two connecting support legs which are arranged at an interval, the detection block is in a cantilever shape and is positioned in the detection notch, and detection support legs are arranged on the connecting support legs; the detection block is used for bearing the impact force of opening the anti-explosion valve so as to enable the connecting support leg and the detection support leg to be broken to form a detection signal; wherein the distance between the outer edge of the detection block, which is not provided with the connecting support leg, and the edge of the detection notch is 1-3mm; the area of the detection block is 1.1-1.3 times of the area of the explosion-proof valve switch; the width of each connecting support leg is 1 to 2 mm; and in a normal state, the distance between the detection block and the anti-explosion valve is 1-3mm. According to the invention, the detection is faster, and the detection timeliness and the detection effect are obviously improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery detection, and in particular to a battery explosion-proof valve detection sensor and a processing technology thereof. Background Art

[0002] With the rapid development of energy storage technology, batteries are increasingly used, and the requirements for battery safety and reliability are becoming higher and higher. During the use of batteries, there may be serious overcharging, battery short circuit, serious overheating, thermal runaway, impact or extrusion deformation, and puncture. These problems may cause the internal temperature and pressure of the battery to continue to rise. When it exceeds its own safety threshold, it may cause the battery to explode.

[0003] The battery explosion-proof valve is the last explosion-proof barrier of the battery itself. When the internal pressure of the battery reaches the opening threshold of the safety valve, for example, the opening threshold of the safety valve of lithium-ion batteries is usually 600-800KPa, in order to avoid battery explosion, the battery explosion-proof valve is opened to release gas and reduce pressure. When the battery explosion-proof valve is opened, it means that the battery has a serious safety problem. Therefore, it is necessary to detect when the battery explosion-proof valve is opened to prevent the expansion of safety accidents.

[0004] At present, existing sensors usually determine whether the explosion-proof valve is in an open state by detecting the electrolyte splashed out when the explosion-proof valve is opened. Since the splashing direction of the electrolyte has a certain uncertainty and there is a certain lag in detection after the electrolyte splashes onto the sensor, the detection effect is affected. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a battery explosion-proof valve detection sensor and a processing technology thereof, which has the advantages of simple structure, easy implementation and good detection effect.

[0006] The purpose of the present invention is achieved by the following technical solutions:

[0007] According to a first aspect of an embodiment of the present disclosure, a battery explosion-proof valve detection sensor is provided, comprising:

[0008] A PCB board, wherein the PCB board is provided with a detection notch corresponding to the explosion-proof valve to be detected;

[0009] A detection block is accommodated in the detection notch, the detection block is connected to the PCB board through two spaced connection legs, and the detection block is cantilevered and located in the detection notch, detection legs are arranged on the connection legs, and the detection block is used to bear the impact force of the explosion-proof valve opening to break the connection legs and the detection legs to form a detection signal;

[0010] Wherein, the outer edge of the detection block without the connecting leg is 1-3 mm away from the edge of the detection notch;

[0011] The area of ​​the detection block is 1.1-1.3 times the switch area of ​​the explosion-proof valve;

[0012] The width of the connecting leg is 1-2 mm;

[0013] And under normal conditions, the distance between the detection block and the explosion-proof valve is 1-3 mm.

[0014] To implement the above technical solution, when in use, the PCB board is assembled to the battery, and the detection block is made to correspond to the explosion-proof valve, that is, the detection block is located directly above the explosion-proof valve and is 1-3mm away from the explosion-proof valve. When the battery fails and causes the explosion-proof valve to open, an upward impact force will be generated and act on the detection block. The detection block will be deformed upward by the impact force, thereby causing the connecting leg and the detection leg to break and generate a detection signal. The detection signal can be detected by the detection circuit as a valve opening signal, thereby realizing the valve opening detection of the explosion-proof valve. By setting a suitable distance between the detection block and the detection notch, the detection block will not interfere with the detection notch when it is deformed, By setting a suitable width of the connecting legs, the connecting legs need to be subjected to a certain force before they can be broken, thereby preventing breakage failures during normal use or transportation. By setting a suitable area ratio of the detection block and a suitable spacing between the detection block and the explosion-proof valve, the detection block can reasonably bear the impact force generated when the explosion-proof valve is opened, ensuring that the detection block can be displaced and deformed when receiving the impact force, thereby completing the detection of the fracture of the detection legs. Since the valve opening detection is performed by directly bearing the impact force, the detection is faster than the electrolyte detection method, which significantly improves the timeliness of the detection, provides a faster response for subsequent signal processing, and improves the detection effect.

[0015] In some exemplary embodiments, the detection block includes: a first receiving portion in a rectangular shape, and a second receiving portion in a semicircular / semi-elliptical shape, and the connecting leg is disposed on a side of the first receiving portion opposite to the second receiving portion.

[0016] To implement the above technical solution, the first receiving portion is arranged in a rectangular shape to facilitate the arrangement of the connecting legs, and the second receiving portion is arranged to facilitate the detection block to receive the impact force and cause deformation.

[0017] In some exemplary embodiments, the detection leg includes a first leg and a second leg, the first leg and the second leg are connected to a detection circuit, and when the first leg and / or the second circuit is broken, the resistance value of the detection circuit is changed to form a detection signal.

[0018] To implement the above technical solution, when the first leg and / or the second leg breaks, the resistor connected thereto can be disconnected, thereby causing the resistance value of the entire detection circuit to change. The detection circuit detects the change in the electrical signal to form a detection signal, determines that the explosion-proof valve is open, and completes the valve opening detection.

[0019] In some exemplary embodiments, the two connecting legs are symmetrically arranged on the detection block, and the distance d between the two connecting legs satisfies 2 / 3*D≥d≥1 / 3*D, where D is the width of the detection block.

[0020] Implementing the above technical solution makes it easier for the connecting leg to break when the detection block is deformed, thereby realizing valve opening detection.

[0021] In some exemplary embodiments, the thickness of the PCB board is 1.4-1.8 mm.

[0022] To implement the above technical solution, by setting a suitable plate thickness, the connecting legs have a suitable load-bearing performance, so that the detection block can break after being subjected to a suitable impact force to achieve valve opening detection.

[0023] In some exemplary embodiments, stress dispersion angles are formed at two corners on one side where the detection notch is connected to the connecting leg, and the stress dispersion angles are used to disperse the stress generated when the connecting leg is broken.

[0024] By implementing the above technical solution, the stress generated when the connecting leg breaks can be dispersed through the stress dispersion angle, thereby preventing damage to the PCB board when breaking, thereby ensuring the integrity of the detection circuit.

[0025] According to a second aspect of an embodiment of the present disclosure, a processing technology for a battery explosion-proof valve detection sensor is provided, comprising:

[0026] Take a PCB substrate of suitable size, perform groove processing on the PCB substrate according to a predetermined process size to form a plurality of detection notches, and form a detection block and a connecting leg corresponding to each detection notch, wherein the connecting leg is located on one side of the detection block so that the detection block is cantilevered in the detection notch, the outer edge of the detection block without the connecting leg is 1-3 mm away from the edge of the detection notch, the area of ​​the detection block is 1.1-1.3 times the area of ​​the explosion-proof valve switch, and the width of the connecting leg is 1-2 mm;

[0027] Printing a detection circuit on the PCB substrate, wherein the detection circuit is connected to a detection foot, and the detection foot is arranged on the connection foot;

[0028] The PCB substrate is cut into pieces to form a single sensor or a detection board group including a plurality of sensors.

[0029] To implement the above technical solution, the detection block and the connecting leg are formed by direct groove processing, and the overall processing process is simple. By setting a suitable distance between the detection block and the detection slot, the detection block will not interfere with the detection slot when it is deformed. By setting a suitable width size of the connecting leg, the connecting leg needs a certain force to be broken, thereby preventing fracture failures during normal use or transportation. By setting a suitable area ratio of the detection block, the detection block can reasonably bear the impact force generated when the explosion-proof valve is opened, ensuring that the detection block can be displaced and deformed when it receives the impact force, thereby completing the detection of the fracture of the detection leg. Since the sensor performs valve opening detection by directly bearing the impact force, the detection is faster than the detection method of electrolyte detection, which significantly improves the timeliness of detection, provides a faster response for subsequent signal processing, improves the detection effect, and can be processed into a single sensor or a detection plate group as needed, thereby meeting different usage requirements.

[0030] In some exemplary embodiments, a single sensor or a detection board group is assembled on the battery pack so that the detection block corresponds to the explosion-proof valve, and in a normal state, the distance between the detection block and the explosion-proof valve is 1-3 mm.

[0031] To implement the above technical solution, by setting a suitable spacing between the detection block and the explosion-proof valve and coordinating the valve opening spacing of the explosion-proof valve, a suitable impact force can be applied to the detection block when the valve is opened, thereby realizing valve opening detection.

[0032] In some exemplary embodiments, the detection block includes: a first receiving portion in a rectangular shape, and a second receiving portion in a semicircular / semi-elliptical shape, and the connecting leg is disposed on a side of the first receiving portion opposite to the second receiving portion.

[0033] In some exemplary embodiments, the PCB substrate has a thickness of 1.4-1.8 mm.

[0034] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0035] The embodiment of the present invention provides a battery explosion-proof valve detection sensor and a processing technology thereof. When in use, a PCB board is assembled to the battery, and the detection block is made to correspond to the explosion-proof valve, that is, the detection block is located directly above the explosion-proof valve and is 1-3 mm away from the explosion-proof valve. When a battery failure causes the explosion-proof valve to open, an upward impact force is generated and acts on the detection block. The detection block is deformed upward by the impact force, and then the connecting leg and the detection leg are broken to generate a detection signal, thereby realizing the opening detection of the explosion-proof valve. By setting a suitable distance between the detection block and the detection notch, the detection block will not interfere with the detection notch when it is deformed, and the detection signal can be generated by the detection block. By setting a suitable width of the connecting leg, the connecting leg needs a certain force to be broken, so as to prevent breakage failure in normal use or transportation. By setting a suitable area ratio of the detection block and a suitable spacing between the detection block and the explosion-proof valve, the detection block can reasonably bear the impact force generated when the explosion-proof valve is opened, ensuring that the detection block can be displaced and deformed when receiving the impact force, so as to complete the detection of the breakage of the detection leg. Since the valve opening detection is carried out by directly bearing the impact force, the detection is faster than the electrolyte detection method, which significantly improves the timeliness of the detection, provides a faster response for subsequent signal processing, and improves the detection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the structure of a battery explosion-proof valve detection sensor in an embodiment of the present invention.

[0037] Figure 2 It is a front view of a battery explosion-proof valve detection sensor in an embodiment of the present invention.

[0038] Figure 3 Schematic diagram of the arrangement of the detection feet in an embodiment of the present invention.

[0039] Figure 4 It is a schematic structural diagram of a detection plate group manufactured by a processing technology in an embodiment of the present invention.

[0040] Figure 5 It is a structural schematic diagram of different detection block shapes in the comparative experiment of the present invention.

[0041] The numbers and letters in the figure represent the corresponding component names:

[0042] 10. PCB board; 11. Detection notch; 12. Stress dispersion angle; 20. Detection block; 21. Connecting leg; 22. Detection leg; 221. First leg; 222. Second leg; 23. First receiving portion; 24. Second receiving portion. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] like Figures 1 to 4 As shown, a first aspect of an embodiment of the present invention provides a battery explosion-proof valve detection sensor, comprising: a PCB board 10, on which a detection slot 11 corresponding to the explosion-proof valve to be detected is opened; a detection block 20 accommodated in the detection slot 11, the detection block 20 is connected to the PCB board 10 through two spaced connecting legs 21, and the detection block 20 is cantilevered and located in the detection slot 11, and a detection leg 22 is arranged on the connecting leg 21, and the detection block 20 is used to bear the impact force of opening the explosion-proof valve to break the connecting leg 21 and the detection leg 22 to form a detection signal.

[0045] Specifically, the outer edge of the detection block 20 without the connecting leg 21 is 1-3mm away from the edge of the detection slot 11, the area of ​​the detection block 20 is 1.1-1.3 times the switch area of ​​the explosion-proof valve, the width of the connecting leg 21 is 1-2mm, and in a normal state, the distance between the detection block 20 and the explosion-proof valve is 1-3mm; preferably, the outer edge of the detection block 20 without the connecting leg 21 is 2mm away from the edge of the detection slot 11, the area of ​​the detection block 20 is 1.2 times the switch area of ​​the explosion-proof valve, the width of the connecting leg 21 is 1.6mm, and in a normal state, the distance between the detection block 20 and the explosion-proof valve is 2mm.

[0046] The detection block 20 includes: a first receiving portion 23 in a rectangular shape, and a second receiving portion 24 in a semicircular / semi-elliptical shape. The connecting leg 21 is arranged on the side of the first receiving portion 23 opposite to the second receiving portion 24. The first receiving portion 23 is arranged in a rectangular shape to facilitate the setting of the connecting leg 21, and the setting of the second receiving portion 24 facilitates the detection block 20 to withstand the impact force and cause deformation.

[0047] The detection leg 22 includes a first leg 221 and a second leg 222, and the first leg 221 and the second leg 222 are connected to the detection circuit. When the first leg 221 and / or the second circuit 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 PCB board 10 and the detection block 20, and the first leg 221 and the second leg 222 are connected with a detection resistor. Under normal circumstances, the detection resistor is connected in parallel in the detection circuit through the first leg 221 and the second leg 222. When the first leg 221 and / or the second leg 222 is broken, the detection resistor forms a short circuit, thereby causing the resistance value of the entire detection circuit to change. The detection circuit detects the change in the electrical signal to form a detection signal, determines that the explosion-proof valve is open, and completes the valve opening detection.

[0048] The two connecting legs 21 are symmetrically arranged on the detection block 20, and the spacing d between the two connecting legs 21 satisfies 2 / 3*D≥d≥1 / 3*D, wherein D is the width of the detection block 20, preferably, d=1 / 2*D, so that the connecting legs 21 are more likely to break when the detection block 20 is deformed, thereby realizing valve opening detection; and the thickness of the PCB board 10 is 1.4-1.8mm, preferably, the thickness of the PCB board 10 is 1.6mm. Since the connecting legs 21 are directly formed in the PCB board 10, the thickness of the PCB board 10 is the same as the thickness of the connecting legs 21. By setting a suitable board thickness, the connecting legs 21 have a suitable load-bearing performance, so that the detection block 20 can break after being subjected to a suitable impact force to realize valve opening detection.

[0049] Furthermore, stress dispersion angles 12 are formed at the two corners on the side where the detection slot 11 is connected to the connecting leg 21. The stress dispersion angles 12 are used to disperse the stress generated when the connecting leg 21 is broken. The stress dispersion angles 12 can disperse the stress generated when the connecting leg 21 is broken, thereby preventing damage to the PCB board 10 when it is broken, thereby ensuring the integrity of the detection circuit.

[0050] When in use, the PCB board 10 is assembled to the battery, and the detection block 20 is made to correspond to the explosion-proof valve, that is, the detection block 20 is located directly above the explosion-proof valve and is 1-3mm away from the explosion-proof valve. When the battery fails and causes the explosion-proof valve to open, an upward impact force will be generated and act on the detection block 20. The detection block 20 will be deformed upward by the impact force, thereby causing the connecting leg 21 and the detection leg 22 to break and generate a detection signal. The detection signal can be detected by the detection circuit as a valve opening signal, thereby realizing the valve opening detection of the explosion-proof valve; by setting a suitable distance between the detection block 20 and the detection slot 11, the detection block 20 will not interfere with the detection slot 11 when it is deformed, By setting a suitable width dimension of the connecting leg 21, the connecting leg 21 needs a certain force to be broken, thereby preventing breakage failures in normal use or transportation. By setting a suitable area ratio of the detection block 20 and coordinating a suitable spacing between the detection block 20 and the explosion-proof valve, the detection block 20 can reasonably bear the impact force generated when the explosion-proof valve is opened, ensuring that the detection block 20 can be displaced and deformed when receiving the impact force, thereby completing the detection by breaking the detection leg 22. Since the valve opening detection is performed by directly bearing the impact force, the detection is faster than the electrolyte detection method, which significantly improves the timeliness of the detection, provides a faster response for subsequent signal processing, and improves the detection effect.

[0051] A second aspect of an embodiment of the present invention provides a processing technology for a battery explosion-proof valve detection sensor, including:

[0052] S100, take a PCB substrate of suitable size, perform groove processing on the PCB substrate according to a predetermined process size to form a plurality of detection notches 11, and form a detection block 20 and a connecting leg 21 corresponding to each detection notch 11, wherein the connecting leg 21 is located on one side of the detection block 20 so that the detection block 20 is cantilevered in the detection notch 11, the outer edge of the detection block 20 where the connecting leg 21 is not provided is 1-3mm away from the edge of the detection notch 11, the area of ​​the detection block 20 is 1.1-1.3 times the area of ​​the explosion-proof valve switch, and the width of the connecting leg 21 is 1-2mm.

[0053] Specifically, the thickness of the PCB substrate is selected to be 1.4-1.8 mm, and a PCB substrate with a thickness of 1.6 mm is preferably used. During the groove processing, the detection block 20 and the connecting leg 21 are formed at the same time as the detection notch 11 is formed. Preferably, the outer edge of the detection block 20 without the connecting leg 21 is 2 mm away from the edge of the detection notch 11, the area of ​​the detection block 20 is 1.2 times the area of ​​the explosion-proof valve switch, and the width of the connecting leg 21 is 1.6 mm.

[0054] Among them, the detection block 20 includes: a first receiving portion 23 in a rectangular shape, and a second receiving portion 24 in a semicircular / semi-elliptical shape. The connecting leg 21 is arranged on the side of the first receiving portion 23 opposite to the second receiving portion 24. The first receiving portion 23 is arranged in a rectangular shape to facilitate the setting of the connecting leg 21, and the setting of the second receiving portion 24 facilitates the detection block 20 to withstand the impact force and deform.

[0055] S200 , printing a detection circuit on a PCB substrate, wherein the detection circuit is connected to a detection leg 22 , and the detection leg 22 is arranged on the connection leg 21 .

[0056] Among them, the detection leg 22 includes a first leg 221 and a second leg 222, and the first leg 221 and the second leg 222 are connected to the detection circuit. When the first leg 221 and / or the second circuit 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 PCB board 10 and the detection block 20, and the first leg 221 and the second leg 222 are connected with a detection resistor. Under normal circumstances, the detection resistor is connected in parallel in the detection circuit through the first leg 221 and the second leg 222. When the first leg 221 and / or the second leg 222 is broken, the detection resistor forms a short circuit, thereby causing the resistance value of the entire detection circuit to change, thereby forming a detection signal to complete the valve opening detection.

[0057] S300, cutting the PCB substrate to form a single sensor or a detection board group including multiple sensors. Specifically, the cutting process can be performed to form a single sensor or a detection board group according to actual application requirements. A single sensor can be suitable for a single battery. The structure of the detection board group is as follows: Figure 4 As shown, the detection board group is suitable for a battery pack consisting of multiple batteries.

[0058] Furthermore, when in use, a single sensor or a detection plate group is assembled on the battery pack so that the detection block 20 corresponds to the explosion-proof valve, and under normal conditions, the distance between the detection block 20 and the explosion-proof valve is 1-3mm, preferably, the distance between the detection block 20 and the explosion-proof valve is 2mm; by setting a suitable distance between the detection block 20 and the explosion-proof valve, coordinating the valve opening distance of the explosion-proof valve, a suitable impact force can be applied to the detection block 20 when the valve is opened, thereby realizing valve opening detection.

[0059] The detection block 20 and the connecting leg 21 are formed by directly forming the groove, and the overall processing process is simple. By setting a suitable distance between the detection block 20 and the detection slot 11, the detection block 20 will not interfere with the detection slot 11 when it is deformed. By setting a suitable width size of the connecting leg 21, the connecting leg 21 needs a certain force to be broken, thereby preventing a breakage failure during normal use or transportation. By setting a suitable area ratio of the detection block 20, the detection block 20 can reasonably bear the impact force generated when the explosion-proof valve is opened, ensuring that the detection block 20 can be displaced and deformed when it receives the impact force, so that the detection leg 22 is broken to complete the detection. Since the sensor performs valve opening detection by directly bearing the impact force, the detection is faster than the electrolyte detection method, which significantly improves the timeliness of the detection, provides a faster response for subsequent signal processing, improves the detection effect, and can be processed into a single sensor or a detection plate group as needed, thereby meeting different usage requirements.

[0060] In order to verify the specific detection functions of different sensor size structures, the following comparative experiments are provided for illustration:

[0061] Comparative Experiment 1

[0062] The probability of breaking of the connecting legs was tested by setting different size ratios of the detection block and the explosion-proof valve. Specifically, the size ratios of the detection block and the explosion-proof valve were set to 0.8:1, 1:1, and 1.2:1, respectively. Then, the sensor and the explosion-proof valve were set accordingly, and the valve opening test was performed to determine the probability of breaking of different sensors. The specific test results are as follows:

[0063]

[0064] According to the test results, when the size ratio of the detection block to the explosion-proof valve is greater than 1.2, it can be guaranteed that the detection block will be triggered to open 100%.

[0065] Comparative Experiment 2

[0066] Set different test block shapes to test the breaking force and breaking probability of the connecting legs. For example, Figure 5 As shown in the figure, several different detection blocks and connection feet are set in the form of a~g, and then the sensor and the explosion-proof valve are set accordingly, and the valve opening test is carried out to determine the probability of the opening of different sensors. The specific test results are as follows:

[0067] sensor a b c d e f g Breaking force 54N 32N 10N 45N 40N 35N 20N Thrust probability 40％ 50％ 70％ 60％ 70％ 90％ 100％ Effect Poor Poor generally Poor generally generally Optimal

[0068] According to the test results, Figure 5The sensor shape shown in -g has the best effect and can ensure that the detection block is 100% triggered to break open under the action of 20N impact force. Therefore, the shape of the detection block and the arrangement of the connecting legs are set to ensure effective breaking without causing misjudgment of damage due to insufficient force.

[0069] Comparative Experiment 3

[0070] Different PCB board thicknesses were set to test the breaking force of the connecting legs. Specifically, PCB boards with thicknesses of 0.8mm, 1.0mm, 1.6mm, and 2.0mm were set respectively. Then the sensor and the explosion-proof valve were set accordingly, and the valve opening test was performed to determine the breaking force of different sensors. The specific test results are as follows:

[0071] PCB board thickness 0.8mm 1.0mm 1.6mm 2.0mm Breaking force 5N 12N 20N 40N

[0072] According to the test results, when the PCB board thickness is 1.6mm, it can ensure that the connecting legs are effectively broken under the action of 20N breaking force, and at the same time it will not cause the sensor to trigger a short circuit too easily.

[0073] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which are equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of them belong to the protection scope of the present invention.

Claims

1. A battery explosion-proof valve detection sensor, characterized in that: include: A PCB board, wherein the PCB board is provided with a detection notch corresponding to the explosion-proof valve to be detected; A detection block is accommodated in the detection notch, the detection block is connected to the PCB board through two spaced connection legs, and the detection block is cantilevered and located in the detection notch, detection legs are arranged on the connection legs, and the detection block is used to bear the impact force of the explosion-proof valve opening to break the connection legs and the detection legs to form a detection signal; Wherein, the outer edge of the detection block without the connecting leg is 1-3 mm away from the edge of the detection notch; The area of ​​the detection block is 1.1-1.3 times the switch area of ​​the explosion-proof valve; The width of the connecting leg is 1-2 mm; And under normal conditions, the distance between the detection block and the explosion-proof valve is 1-3 mm.

2. The battery explosion-proof valve detection sensor according to claim 1, characterized in that: The detection block comprises: a first receiving portion in a rectangular shape, and a second receiving portion in a semicircular / semi-elliptical shape, and the connecting leg is arranged on a side of the first receiving portion opposite to the second receiving portion.

3. The battery explosion-proof valve detection sensor according to claim 1 or 2, characterized in that: The detection leg comprises a first leg and a second leg, wherein the first leg and the second leg are connected to a detection circuit, and when the first leg and / or the second circuit is broken, the resistance value of the detection circuit is changed to form a detection signal.

4. The battery explosion-proof valve detection sensor according to claim 1, characterized in that: The two connecting legs are symmetrically arranged on the detection block, and the distance d between the two connecting legs satisfies 2 / 3*D≥d≥1 / 3*D, where D is the width of the detection block.

5. The battery explosion-proof valve detection sensor according to claim 1, characterized in that: The thickness of the PCB board is 1.4-1.8 mm.

6. The battery explosion-proof valve detection sensor according to claim 2, characterized in that: Stress dispersion angles are formed at two corners on one side where the detection notch is connected to the connecting leg, and the stress dispersion angles are used to disperse the stress generated when the connecting leg is broken.

7. A processing technology for a battery explosion-proof valve detection sensor, characterized in that: include: Take a PCB substrate of suitable size, perform groove processing on the PCB substrate according to a predetermined process size to form a plurality of detection notches, and form a detection block and a connecting leg corresponding to each detection notch, wherein the connecting leg is located on one side of the detection block so that the detection block is cantilevered in the detection notch, the outer edge of the detection block without the connecting leg is 1-3 mm away from the edge of the detection notch, the area of ​​the detection block is 1.1-1.3 times the area of ​​the explosion-proof valve switch, and the width of the connecting leg is 1-2 mm; Printing a detection circuit on the PCB substrate, wherein the detection circuit is connected to a detection foot, and the detection foot is arranged on the connection foot; The PCB substrate is cut into pieces to form a single sensor or a detection board group including a plurality of sensors.

8. The processing technology of the battery explosion-proof valve detection sensor according to claim 7, characterized in that: A single sensor or a detection plate group is assembled on the battery pack so that the detection block corresponds to the explosion-proof valve, and under normal conditions, the distance between the detection block and the explosion-proof valve is 1-3 mm.

9. The processing technology of the battery explosion-proof valve detection sensor according to claim 7, characterized in that: The detection block comprises: a first receiving portion in a rectangular shape, and a second receiving portion in a semicircular / semi-elliptical shape, and the connecting leg is arranged on a side of the first receiving portion opposite to the second receiving portion.

10. The processing technology of the battery explosion-proof valve detection sensor according to claim 7, characterized in that: The thickness of the PCB substrate is 1.4-1.8 mm.

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