A device mounting apparatus and method for monitoring pressure within a battery

Abstract

The application discloses a device mounting equipment and method for monitoring the pressure in a battery, and relates to the technical field of battery safety monitoring. The device mounting equipment comprises a device rack, a mounting seat plate is arranged in the tabletop of the device rack, a top plate is fixed by a plurality of supporting columns on the mounting seat plate, a transverse sliding rail and a pressure film mounting assembly are arranged below the top plate, the transverse sliding rail is arranged on the top plate, the pressure film mounting assembly is arranged on the transverse sliding rail and can be driven to move by the transverse sliding rail, the pressure film mounting assembly is used for placing a pressure film sensing sheet, a battery cover plate fixing assembly is arranged above the pressure film mounting assembly and is arranged on the top plate, the battery cover plate fixing assembly is used for fixing a battery cover plate, a glue applying box is further arranged on the top plate, and the glue applying box is used for applying glue on the pressure film sensing sheet.

Description

Technical Field

[0001] This invention relates to the field of battery safety monitoring technology, specifically to an installation device and method for monitoring the internal pressure of a battery. Background Technology

[0002] The safety issues of lithium-ion batteries stem from internal thermal runaway, where heat accumulates and causes the internal temperature to rise continuously, increasing the internal pressure. Externally, this manifests as violent energy release phenomena such as combustion and explosion.

[0003] For lithium batteries, under conditions of electrical, thermal, and mechanical abuse, the battery is prone to explosion due to increased internal pressure. Therefore, it is necessary to monitor the internal pressure of the battery. The traditional method for testing the internal pressure of the battery is to weld an aluminum vent tube to the battery filling port, connect a pressure gauge to the aluminum vent tube using a plastic tube, and seal it with resin to achieve the purpose of testing the internal pressure of the battery.

[0004] In traditional battery internal pressure testing methods, as the battery internal pressure increases, the electrolyte inside the battery will be discharged through the gas-conducting aluminum tube, causing the sample to fail and affecting the test results. At the same time, this testing method requires the tester to constantly monitor and record the pressure gauge, which has drawbacks such as being time-consuming. Summary of the Invention

[0005] The purpose of this invention is to provide an installation device and method for monitoring the internal pressure of a battery, so as to solve the above-mentioned defects caused by the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a device frame is included, with a mounting plate inside the platform of the device frame. The mounting plate has a top plate fixed by multiple support columns. Below the top plate are a transverse slide rail and a pressure diaphragm mounting assembly. The transverse slide rail is mounted on the top plate, and the pressure diaphragm mounting assembly is mounted on the transverse slide rail and can be moved by the transverse slide rail. The pressure diaphragm mounting assembly is used to place a pressure diaphragm sensing element. Above the pressure diaphragm mounting assembly is a battery cover fixing assembly mounted on the top plate. The battery cover fixing assembly is used to fix the battery cover. The top plate also has an adhesive applicator for applying adhesive to the pressure diaphragm sensing element.

[0007] Preferably, the pressure diaphragm mounting assembly includes a support plate, a wire coil post, and a rubber head located on top of the wire coil post. One end of the support plate is connected to a transverse slide rail, the bottom of the wire coil post is fixed to a fixing block, the fixing block is fixed to the side of the support plate, and the wire coil post and the rubber head are hollow structures.

[0008] Preferably, the upper surface of the support plate is provided with a mounting groove.

[0009] Preferably, the side of the coil post and the rubber head is provided with an opening, which allows the wire bundle of the pressure diaphragm sensing sheet to be correctly placed into the coil post and the rubber head.

[0010] Preferably, the rubber head is also provided with a transverse through-hole for cable exit.

[0011] Preferably, the battery cover fixing assembly includes a hydraulic cylinder, a base plate, and a magnetic suction plate. The hydraulic cylinder is fixed on the top plate, the base plate is mounted on the output shaft of the hydraulic cylinder, and the base plate and the magnetic suction plate are connected by a connecting rod.

[0012] Preferably, the magnetic suction plate is provided with a clearance groove to accommodate the rubber head, the lower surface of the magnetic suction plate is provided with a groove, an electric push rod is provided in the groove, a push pin is provided on the output shaft of the electric push rod, and a clip is provided on the opposite side of the push pin.

[0013] Preferably, the end of the push pin is provided with a groove; the clamping surface of the clip is provided with a friction pad.

[0014] Preferably, the glue applicator is connected to an external glue source via a pipe, and the bottom of the glue applicator is provided with an elongated glue outlet.

[0015] This invention also discloses a method for monitoring the internal pressure of a battery, comprising the following steps:

[0016] S1. Install the pressure diaphragm sensor onto the battery cover using the aforementioned mounting equipment;

[0017] S2. Pass the wire harness of the pressure diaphragm sensor through the liquid injection hole of the battery cover and connect it to the external data acquisition device, while sealing the liquid injection hole;

[0018] S3. Use a signal data cable to connect the output terminal on the battery cover explosion-proof valve to the data acquisition unit, and then connect it to the computer terminal;

[0019] S4. After the lithium battery is fully charged, overcharge it with a 1C current and observe the changes in battery voltage and internal pressure.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The device designed in this invention can meet the requirements for rapid installation of pressure diaphragm sensor. When it is necessary to pass the wire harness of the pressure diaphragm sensor through the injection hole, the wire can be quickly threaded through the set wire wrapping post, thereby improving the installation efficiency of the pressure diaphragm sensor.

[0022] 2. The monitoring method set in this invention can realize the function of testing and real-time monitoring of the internal pressure of the battery. It is simple and convenient to operate, can predict battery safety in advance, and effectively avoid the occurrence of safety accidents. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the present invention;

[0026] Figure 4 for Figure 3 Enlarged view of the structure at point A inside;

[0027] Figure 5 This is a schematic diagram of the magnetic accumulator plate and its associated structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the pressure diaphragm mounting assembly structure;

[0029] Figure 7 for Figure 6 Enlarged view of the structure at point B;

[0030] Figure 8 This is a schematic diagram of the pressure film sensor structure;

[0031] Figure 9 This is a diagram showing the results of a comparative experiment;

[0032] Figure 10 The figure shows the experimental results of the example.

[0033] Wherein: 1-device frame; 2-mounting base plate; 3-support column; 4-top plate; 5-transverse slide rail;

[0034] 6-Pressure diaphragm mounting assembly; 61-Support plate; 611-Mounting groove; 62-Wire wrapping post; 63-Rubber head; 631-Cable outlet hole; 64-Fixing block;

[0035] 7-Battery cover fixing assembly; 71-Hydraulic cylinder; 72-Base plate; 73-Magnetic suction plate; 731-Void groove; 732-Electric push rod; 733-Push pin; 735-Clamping piece; 74-Sliding block;

[0036] 8-Glue coating box; 100-Battery cover. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0038] Please see Figures 1 to 8This invention provides a technical solution comprising a device frame 1, a mounting plate 2 within the platform of the device frame 1, a top plate 4 fixed by multiple support columns 3 on the mounting plate 2, a transverse slide rail 5 and a pressure film mounting assembly 6 below the top plate 4, the transverse slide rail 5 mounted on the top plate 4, and the pressure film mounting assembly 6 mounted on the transverse slide rail 5 and movable by the transverse slide rail 5, the pressure film mounting assembly 6 for placing a pressure film sensing element, a battery cover fixing assembly 7 mounted on the top plate 4 above the pressure film mounting assembly 6 for fixing a battery cover 100, and an adhesive applicator 8 on the top plate 4 for applying adhesive to the pressure film sensing element. The pressure film sensing element consists of two layers of flexible, bendable film material, the upper layer being a pressure-sensitive film and the lower layer being an electrode film. The pressure film sensing element is bonded to the battery cover 100 for testing pressure changes inside the battery.

[0039] In this embodiment, the pressure diaphragm mounting assembly 6 includes a support plate 61, a wire coil post 62, and a rubber head 63 located on top of the wire coil post 62. One end of the support plate 61 is connected to the transverse slide rail 5, and the bottom of the wire coil post 62 is fixed to a fixing block 64. The fixing block 64 is fixed to the side of the support plate 61. The wire coil post 62 and the rubber head 63 are hollow structures. The support plate 61 is used to place the pressure diaphragm sensing sheet. The wire bundle of the placed pressure diaphragm sensing sheet will be placed inside the hollow wire coil post 62 and the rubber head 63 for subsequent passage through the liquid injection hole of the battery cover plate 100.

[0040] In this embodiment, the upper surface of the support plate 61 is provided with a mounting groove 611, which is used to hold the pressure diaphragm sensing sheet in place and prevent it from shifting.

[0041] In this embodiment, the side of the coil post 62 and the rubber head 63 is provided with an opening. The opening allows the wire bundle of the pressure diaphragm sensor to be correctly placed into the coil post 62 and the rubber head 63. Placing the wire bundle of the pressure diaphragm sensor into the coil post 62 and the rubber head 63 from the opening allows it to be vertically inserted into the injection hole.

[0042] In this embodiment, the rubber head 63 is also provided with a transverse through-hole 631, which facilitates the subsequent wire harness to be pushed out from the rubber head 63.

[0043] In this embodiment, the battery cover fixing assembly 7 includes a hydraulic cylinder 71, a base plate 72, and a magnetic suction plate 73. The hydraulic cylinder 71 is fixed on the top plate 4, and the base plate 72 is mounted on the output shaft of the hydraulic cylinder 71. The base plate 72 and the magnetic suction plate 73 are connected by a connecting rod. The magnetic suction plate 73 is used to fix the battery cover 100. The battery cover 100 made of different materials can also be replaced with a plate with suction cups as needed.

[0044] In this embodiment, the magnetic suction plate 73 is provided with a clearance groove 731 to accommodate the rubber head 63. The lower surface of the magnetic suction plate 73 is provided with a groove, and an electric push rod 732 is provided in the groove. A push pin 733 is provided on the output shaft of the electric push rod 732. A clamping piece 734 is provided on the opposite side of the push pin 733. A slot is provided at the end of the push pin 733. A friction pad is provided on the clamping surface of the clamping piece 734. After the wire bundle is passed through the injection hole by the wire-wrapping post 62 and the rubber head 63, the electric push rod 732 pushes the push pin 733 to push the wire bundle out from the rubber head 63 into the clamp 734. With the help of the friction pad in the clamp 734, the wire bundle is squeezed in the clamping piece 734, completing the process of the wire bundle passing through the injection hole.

[0045] In this embodiment, the glue application box 8 is connected to an external glue source through a pipe. The bottom of the glue application box 8 is provided with an elongated glue outlet hole. The length of the glue outlet hole is matched with the length of the pressure film sensing sheet, which can uniformly apply glue to the pressure film sensing sheet and bond the pressure film sensing sheet to the battery cover plate 100.

[0046] The working principle is as follows: First, the battery casing is placed on the mounting plate 2, and the battery cover 100 is fixed by the magnetic plate 73. Then, the support plate 61 is moved to the outside of the glue application box 8 via the transverse slide rail 5. The pressure film sensor is placed on the support plate 61, and the wire harness of the pressure film sensor is placed in the coil post 63 and the rubber head 63. The support plate 61 and the pressure film sensor are moved below the battery cover 100 via the transverse slide rail 5. During the return process, the pressure film sensor will be coated with glue through the glue application box 8. At this time, the coil post 62 is aligned with the liquid injection hole on the upper battery cover 100. Then, the control... Hydraulic cylinder 71 drives magnetic plate 73 and battery cover 100 to move down until the wire coil post 62 and rubber head 63 pass through the injection hole. The electric push rod 732 pushes the push pin 733 to push the wire harness out of the rubber head 63 into the clamp 734. With the help of the friction pad in the clamp 734, the wire harness is squeezed into the clamp 734. Then, the support plate 61 is moved out again by the transverse slide rail 5, and a new pressure film sensor is placed as a reserve for the next installation. The pressure film sensor, which has been glued, will continue to move down with magnetic plate 73 to cover the battery casing, and then be welded and fixed, completing the installation of the pressure film sensor.

[0047] This invention also discloses a method for monitoring the internal pressure of a battery, comprising the following steps:

[0048] S1. Install the pressure diaphragm sensor onto the battery cover using the aforementioned mounting equipment;

[0049] S2. Pass the wire harness of the pressure diaphragm sensor through the liquid injection hole of the battery cover and connect it to the external data acquisition device, while sealing the liquid injection hole;

[0050] S3. Use a signal data cable to connect the output terminal on the battery cover explosion-proof valve to the data acquisition unit, and then connect it to the computer terminal;

[0051] S4. After the lithium battery is fully charged, overcharge it with a 1C current and observe the changes in battery voltage and internal pressure.

[0052] An example of a comparative experiment between the above method and a traditional method was conducted, as follows:

[0053] Comparative Example (Traditional Method)

[0054] 1. A 280Ah lithium iron phosphate battery was selected as the sample to be tested;

[0055] 2. Weld an aluminum vent tube to the battery filling port, connect the aluminum vent tube to the pressure gauge using a plastic tube, and seal it with resin.

[0056] 3. Fully charge the 280Ah lithium iron phosphate battery to 3.65V;

[0057] 4. After fully charging the 280Ah lithium iron phosphate battery, overcharge it to 5.475V using a 1C current and observe the changes in battery voltage and internal pressure.

[0058] Through append Figure 9 It can be seen that using traditional methods to monitor the internal pressure of a battery during overcharging reveals that as the battery voltage increases, the accuracy of the measured internal pressure value is low, and there is no clear correlation between the internal pressure and the voltage. The internal pressure increases or decreases abruptly, failing to accurately represent the relationship between internal pressure and voltage.

[0059] Example (Monitoring Method Disclosed in this Invention)

[0060] 1. A 280Ah lithium iron phosphate battery was selected as the sample to be tested;

[0061] 2. Using the device of the present invention, the pressure film sensing sheet is bonded to the inside of the battery cover and then sealed with resin;

[0062] 3. Fully charge the 280Ah lithium iron phosphate battery to 3.65V;

[0063] 4. Connect the output terminal on the explosion-proof valve to the data acquisition unit using a signal data cable, and then connect it to the computer terminal;

[0064] 5. Open the pressure distribution testing software on the computer terminal;

[0065] 6. After fully charging the 280Ah lithium iron phosphate battery, overcharge it to 5.475V using a 1C current and observe the changes in battery voltage and internal pressure.

[0066] Through append Figure 10 As can be seen from the voltage change curve of the lithium iron phosphate battery during overcharging, the internal pressure of the battery reaches 1.2 MPa when it is overcharged to 5.0V. Then the battery voltage drops, but the internal pressure remains unchanged. Finally, when the battery reaches the overcharge voltage, the explosion-proof valve ruptures, and electrolyte is ejected. At this time, the internal pressure of the battery drops to 0 MPa.

[0067] As can be seen from the above comparison, this patented invention can effectively monitor the internal pressure of the battery and play a predictive role in battery safety.

[0068] Based on the above, the device designed in this invention can meet the requirements for rapid installation of the pressure film sensor. When it is necessary to pass the wire harness of the pressure film sensor through the injection hole, the wire can be quickly threaded through the set wire post, thereby improving the installation efficiency of the pressure film sensor. The monitoring method set in this invention can realize the function of testing and real-time monitoring of the internal pressure of the battery. It is simple and convenient to operate, can predict battery safety in advance, and effectively avoid the occurrence of safety accidents.

[0069] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A device installation apparatus for monitoring the internal pressure of a battery, characterized in that: The device includes a frame (1), a mounting plate (2) is provided on the platform of the frame (1), a top plate (4) is provided on the mounting plate (2) and fixed by multiple support columns (3), a horizontal slide rail (5) and a pressure film mounting assembly (6) are provided below the top plate (4), the horizontal slide rail (5) is mounted on the top plate (4), the pressure film mounting assembly (6) is mounted on the horizontal slide rail (5) and can be moved by the horizontal slide rail (5), the pressure film mounting assembly (6) is used to place the pressure film sensing sheet, a battery cover fixing assembly (7) is provided above the pressure film mounting assembly (6) and mounted on the top plate (4), the battery cover fixing assembly (7) is used to fix the battery cover (100), and an adhesive box (8) is also provided on the top plate (4), the adhesive box (8) is used to apply adhesive to the pressure film sensing sheet; The pressure diaphragm mounting assembly (6) includes a support plate (61), a wire coil post (62), and a rubber head (63) located on top of the wire coil post (62). One end of the support plate (61) is connected to a transverse slide rail (5). The bottom of the wire coil post (62) is fixed to a fixing block (64). The fixing block (64) is fixed to the side of the support plate (61). The wire coil post (62) and the rubber head (63) are hollow structures. The battery cover fixing assembly (7) includes a hydraulic cylinder (71), a base plate (72) and a magnetic suction plate (73). The hydraulic cylinder (71) is fixed on the top plate (4), and the base plate (72) is installed on the output shaft of the hydraulic cylinder (71). The base plate (72) and the magnetic suction plate (73) are connected by a connecting rod.

2. The device installation equipment for monitoring battery internal pressure according to claim 1, characterized in that: The upper surface of the support plate (61) is provided with a mounting groove (611).

3. The device installation equipment for monitoring battery internal pressure according to claim 1, characterized in that: The side of the coil post (62) and the rubber head (63) are provided with openings, which allow the wire bundle of the pressure diaphragm sensing sheet to be correctly placed into the coil post (62) and the rubber head (63).

4. The device installation equipment for monitoring battery internal pressure according to claim 1, characterized in that: The rubber head (63) is also provided with a transverse through-hole (631).

5. The device installation equipment for monitoring battery internal pressure according to claim 1, characterized in that: The magnetic suction plate (73) is provided with a clearance groove (731) for accommodating the rubber head (63). The lower surface of the magnetic suction plate (73) is provided with a groove, and an electric push rod (732) is provided in the groove. A push pin (733) is provided on the output shaft of the electric push rod (732), and a clip (734) is provided on the opposite side of the push pin (733).

6. The device installation equipment for monitoring battery internal pressure according to claim 5, characterized in that: The end of the push pin (733) is provided with a slot; the clamping surface of the clip (734) is provided with a friction pad.

7. The device installation equipment for monitoring battery internal pressure according to claim 1, characterized in that: The glue application box (8) is connected to an external glue source through a pipe, and the bottom of the glue application box (8) is provided with a long strip-shaped glue outlet.

8. A method for monitoring battery internal pressure using the installation equipment described in claim 1, characterized in that: Includes the following steps: S1. The pressure diaphragm sensor is installed onto the battery cover (100) using the aforementioned mounting equipment; S2. Pass the wire harness of the pressure film sensor through the liquid injection hole of the battery cover (100) and connect it to the external data acquisition device, while sealing the liquid injection hole; S3. Use a signal data cable to connect the output terminal on the explosion-proof valve of the battery cover (100) to the data acquisition device, and then connect it to the computer terminal; S4. After the lithium battery is fully charged, overcharge it with a 1C current and observe the changes in battery voltage and internal pressure.

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