A performance tester for battery pack

Abstract

The present invention relates to the field of battery detection technology, specifically a performance tester for a battery pack, including a pressure measuring mechanism, a tester body and an air circuit system; the pressure measuring mechanism includes three strip-shaped air bags for wrapping the outside of the battery pack, and the three air bags are provided with pressure sensors on one side that fits the battery pack; the tester body includes a shell, a micro air pump disposed inside the shell, a controller and a display screen disposed on the top surface of the shell, the micro air pump is connected to the three air bags through the air circuit system, and the controller is used to receive and process the detection signal of the pressure sensor, and display the data processing result on the display screen. The present invention wraps the three air bags on the outside of the battery pack, and the expansion degree of the battery pack can be judged by the numerical difference of the pressure sensors on the three air bags, so it is easy to use and can be adapted to battery packs of various specifications at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of battery testing, and in particular to a performance tester for a battery pack. Background Art

[0002] With the development of new energy technology, battery packs are increasingly used in various fields as the core of energy, especially in the field of new energy vehicles. As the number of charge and discharge times increases, the volume of existing new energy vehicle battery packs will expand to a certain extent. When the volume of the battery expands to a certain extent, the electrolyte inside the battery may flow out, causing major safety accidents such as combustion or explosion. Therefore, for driving safety, it is necessary to detect the expansion degree of the battery pack.

[0003] In the prior art, a pressure sensor is installed on the outer wall of the battery pack. When the battery expands, the pressure detected by the pressure sensor will increase significantly, thereby reminding the driver that the battery pack has expanded and needs to be replaced in time. However, the pressure sensor in this method is often placed on the battery pack, and the pressure sensor is also electrically connected to the processor inside the car, which makes the cost of the battery pack high. To this end, we propose a performance tester for battery packs to effectively solve the above-mentioned drawbacks. Summary of the invention

[0004] The object of the present invention is to provide a performance tester for a battery pack, so as to solve the problems raised in the above-mentioned background technology.

[0005] The present invention is realized by the following technical solutions: a performance tester for a battery pack, comprising a pressure measuring mechanism, a tester body and a gas path system;

[0006] The pressure measuring mechanism includes three belt-shaped air bags, which are used to wrap around the outside of the battery pack, and the sides of the three air bags that are in contact with the battery pack are all provided with pressure sensors;

[0007] The detector body includes a shell, a micro air pump placed inside the shell, a controller and a display screen placed on the top surface of the shell. The micro air pump is connected to the three air bags through the air path system. The controller is used to receive and process the detection signal of the pressure sensor and display the data processing result on the display screen.

[0008] Optionally, the air circuit system includes a four-way tube and four hoses, one end of the four hoses are respectively connected to the four ports of the four-way tube, the free ends of three of the hoses are respectively connected to the three air bags, and the free end of another hose is connected to the air outlet end of the micro air pump.

[0009] Optionally, the front and back surfaces of both ends of the three airbags are respectively provided with a Velcro hook surface and a Velcro fleece surface.

[0010] Optionally, a deployment piece is provided between two adjacent airbags, the deployment piece is in a belt-shaped structure, and male buckles and female buckles are evenly and spaced apart on both sides of the deployment piece.

[0011] Optionally, four pressure sensors are provided on each side of the three airbags that are in contact with the battery pack, and the pressure sensors are thin film pressure sensors.

[0012] Optionally, a side of the airbag in contact with the battery pack is evenly provided with elastic limit blocks, a surface of the limit block is provided with a spherical limit cavity, and the back of the pressure sensor is provided with a spherical protrusion that is adapted to the limit cavity.

[0013] Optionally, the detector body further includes a battery disposed inside the shell, and the battery is electrically connected to the micro air pump, the controller and the display screen.

[0014] Optionally, the detector body also includes a data interface arranged on the top surface of the shell, and the data interface is used to connect to the connector on the battery pack to obtain the battery pack's OC signal, OD signal, BMS total pressure signal, BMS current signal or MBS load signal or a combination thereof.

[0015] Compared with the prior art, the present invention provides a battery pack performance tester, which has the following beneficial effects:

[0016] 1. The present invention wraps three airbags on the outside of the battery pack, and the expansion degree of the battery pack can be judged by the numerical difference of the pressure sensors on the three airbags. Therefore, it is convenient to use and can be adapted to battery packs of various specifications at the same time;

[0017] 2. In the present invention, the pressure sensor is detachably connected to the airbag, and the position of the pressure sensor on the airbag is adjustable, so it can be easily adapted to battery packs of different specifications so that the pressure sensors are located around the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a cross-sectional view of the structure of the present invention;

[0020] Figure 3 It is a schematic diagram of the pressure measurement mechanism of the present invention;

[0021] Figure 4 for Figure 2 The corresponding figure at A is enlarged;

[0022] Figure 5 for Figure 2 The corresponding figure at B is enlarged;

[0023] Figure 6 This is a schematic diagram of the back side of the pressure sensor of the present invention;

[0024] Figure 7 This is a performance testing principle diagram of the present invention;

[0025] Figure 8 This is a circuit diagram of a driving indicator light of the present invention.

[0026] In the figure: 10, pressure measuring mechanism; 101, airbag; 102, pressure sensor; 103, Velcro hook surface; 104, Velcro fleece surface; 105, unfolding piece; 106, male buckle; 107, female buckle; 108, limit block; 109, limit cavity; 110, protrusion; 20, detector body; 201, shell; 202, micro air pump; 203, controller; 204, display screen; 205, battery; 206, data interface; 207, indicator light; 30, air path system; 301, four-way pipe; 302, hose. DETAILED DESCRIPTION

[0027] 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.

[0028] Example: See Figure 1-Figure 8 A performance tester for a battery pack includes a pressure measuring mechanism 10, a tester body 20 and an air path system 30, wherein the pressure measuring mechanism 10 includes three strip-shaped airbags 101 for wrapping around the outside of the battery pack, and the three airbags 101 are provided with pressure sensors 102 on one side thereof that is in contact with the battery pack; specifically, Velcro hook surfaces 103 and Velcro fur surfaces 104 are respectively provided on the front and back sides of both ends of the three airbags 101, that is, the airbags 101 can be wrapped around the outside of the battery pack by bonding the Velcro hook surfaces 103 and Velcro fur surfaces 104 to each other, and this method can be adapted to battery packs of various specifications; an unfolding piece 105 is provided between two adjacent airbags 101, and the unfolding piece 105 is in a strip-shaped structure, and male buckles 106 and female buckles 107 are evenly and spacedly provided on the front and back sides of the unfolding piece 105, such as Figure 4As shown, by interlocking the male buckle 106 and the female buckle 107, the length of the deployment piece 105 can be adjusted, thereby adjusting the distance between two adjacent airbags 101, so as to adapt to battery packs of various specifications, so that the upper and lower airbags 101 are respectively located on both sides of the battery pack, and the middle airbag 101 is located exactly at the part where the battery pack expands most obviously.

[0029] On the basis of the above embodiment, four pressure sensors 102 are arranged on the side of the three airbags 101 that are in contact with the battery pack. The pressure sensors 102 are thin film pressure sensors with a model of MD30-60. The four pressure sensors 102 are respectively used to be attached to the four sides of the battery pack; elastic limit blocks 108 are evenly arranged on the side of the airbags 101 that are in contact with the battery pack. Figure 3 As shown, the limit block 108 is made of rubber material, and a spherical limit cavity 109 is provided on the surface of the limit block 108. The back of the pressure sensor 102 is provided with a spherical protrusion 110 that is compatible with the limit cavity 109. That is, through the cooperation between the protrusion 110 and the limit block 108, the pressure sensor 102 can be installed at different positions on the airbag 101, so as to adapt to pressure sensors of different specifications.

[0030] The detector body 20 includes a shell 201, a micro air pump 202 disposed inside the shell 201, a controller 203, and a display screen 204 disposed on the top surface of the shell 201, wherein the micro air pump 202 is connected to the three air bags 101 through the air path system 30, the model of the controller 203 is STM32F103C8T6, and the controller 203 is used to receive and process the detection signal of the pressure sensor 102, and display the data processing result on the display screen 204; in the specific use process of this embodiment, the pressure sensor 10 2 is electrically connected to the controller 203 through the circuit, and is used to transmit the pressure signal to the controller 203. The controller 203 calculates the average value of the pressure data of each pressure sensor 102 on the upper and lower airbags 101, and the average value is recorded as a1. The pressure data of each pressure sensor 102 on the middle airbag 101 is averaged, and the average value is recorded as a2. Then a2-a1 is calculated, and the calculation result is recorded as b1. Finally, a1, a2, and b1 are all displayed on the display screen 204.

[0031] It is worth mentioning that when the battery pack expands, the expansion amplitude in the middle of the battery pack must be much greater than the expansion amplitude on both sides of the battery pack, so a2>a1, that is, b1 is a positive number.

[0032] In addition, the detector body 20 also includes a battery 205 disposed inside the shell 201. The battery 205 is electrically connected to the micro air pump 202, the controller 203 and the display screen 204 to supply power to the above devices. The detector body 20 also includes a data interface 206 arranged on the top surface of the shell 201, and the data interface 206 is used to connect to the connector on the battery pack to obtain the OC signal, OD signal, BMS total pressure signal, BMS current signal or MBS load signal of the battery pack; there are five connectors on the battery pack, and the five connectors are used to output the OC signal, OD signal, BMS total pressure signal, BMS current signal and BMS load signal of the battery pack respectively. When it is necessary to detect different performances of the battery pack, only one end of the data line needs to be connected to the data interface 206, and the other end of the data line is connected to the corresponding interface on the battery pack; in addition, the detector body 20 also includes an AD processor and a driving indicator light circuit located inside the shell 201, wherein the AD processor is used to convert the analog signal obtained by the data interface into a data signal, and send the data signal to the driving indicator light circuit, and the driving indicator light circuit includes four indicator lights 207, specifically two red lights and two green lights, and the four indicator lights are all embedded on the top surface of the shell 201; when the signal is abnormal, the red light is on, indicating a fault; when the signal is normal, the green light is on.

[0033] Based on the above embodiment, the air circuit system 30 includes a four-way tube 301 and four hoses 302, one end of the four hoses 302 are respectively connected to the four ports of the four-way tube 301, wherein the free ends of three hoses 302 are respectively connected to the three air bags 101, and the free end of another hose 302 is connected to the air outlet end of the micro air pump 202.

[0034] In the specific use of this embodiment, firstly, the distance between two adjacent airbags 101 is adjusted according to the specifications of the battery pack to be tested, so that the upper and lower airbags 101 are respectively located on both sides of the battery pack, and the middle airbag 101 is located at the most obvious expansion position of the battery pack; then, the pressure sensors 102 are placed on the corresponding limit blocks 108, so that the four pressure sensors 102 on each airbag 101 are located around the battery pack, and then the airbags 101 are wrapped around the outside of the battery pack; when starting the test, firstly, the micro air pump 202 is used to inflate the airbags 101. Since the airbags 101 are connected, the airbags 101 The internal air pressure is also the same. When the airbag 101 is full of air, the micro air pump 202 is turned off. Since the middle airbag 101 is located in the middle part of the battery pack, and when the battery expands, the expansion amplitude in the middle of the battery must be greater than the expansion amplitude on both sides of the battery. Therefore, the pressure value detected by the pressure sensor 102 on the middle airbag 101 must also be greater than the detection values ​​of other pressure sensors 102. After the data of the pressure sensor 102 is processed by the controller 203, the data processing result is displayed on the display screen 204, and the user can judge the expansion degree of the battery pack by viewing the data.

[0035] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery pack performance tester, characterized in that: It comprises a pressure measuring mechanism (10), a detector body (20) and a gas path system (30); The pressure measurement mechanism (10) comprises three belt-shaped air bags (101) for wrapping around the outside of a battery pack, and a pressure sensor (102) is provided on a side of the three air bags (101) that is in contact with the battery pack; The detector body (20) comprises a shell (201), a micro air pump (202) disposed inside the shell (201), a controller (203) and a display screen (204) disposed on the top surface of the shell (201); the micro air pump (202) is connected to the three air bags (101) via the air path system (30); the controller (203) is used to receive and process the detection signal of the pressure sensor (102), and display the data processing result on the display screen (204); When the detection starts, the micro air pump (202) is first used to inflate the airbag (101). Since the airbags (101) are all connected, the internal air pressure of the airbags (101) is the same. When the airbags (101) are full of air, the micro air pump (202) is turned off. Since the middle airbag (101) is located in the middle part of the battery pack, and when the battery expands, the expansion amplitude in the middle of the battery is necessarily greater than the expansion amplitude on both sides of the battery, the pressure value detected by the pressure sensor (102) located on the middle airbag (101) is also necessarily greater than the detection values ​​of other pressure sensors (102). After the controller (203) processes the data of the pressure sensor (102), the data processing result is displayed on the display screen (204), and the user can judge the expansion degree of the battery pack by viewing the data.

2. A battery pack performance tester according to claim 1, characterized in that: The air circuit system (30) comprises a four-way pipe (301) and four hoses (302), one end of each of the four hoses (302) being connected to four ports of the four-way pipe (301), wherein the free ends of three of the hoses (302) are connected to three of the air bags (101), respectively, and the free end of another hose (302) is connected to the air outlet of the micro air pump (202).

3. A battery pack performance tester according to claim 1, characterized in that: The front and back surfaces of the two ends of the three air bags (101) are respectively provided with a Velcro hook surface (103) and a Velcro fleece surface (104).

4. A battery pack performance tester according to claim 1, characterized in that: An unfolding piece (105) is provided between two adjacent airbags (101), the unfolding piece (105) is in a belt-shaped structure, and male buckles (106) and female buckles (107) are evenly and spaced apart on both sides of the unfolding piece (105).

5. A battery pack performance tester according to claim 1, characterized in that: Four pressure sensors (102) are provided on the sides of the three air bags (101) that are in contact with the battery pack, and the pressure sensors (102) are thin film pressure sensors.

6. A battery pack performance tester according to claim 5, characterized in that: A side of the airbag (101) that is in contact with the battery pack is evenly provided with an elastic limiting block (108), a surface of the limiting block (108) is provided with a spherical limiting cavity (109), and a back side of the pressure sensor (102) is provided with a spherical protrusion (110) that is compatible with the limiting cavity (109).

7. A battery pack performance tester according to claim 1, characterized in that: The detector body (20) further comprises a storage battery (205) arranged inside the housing (201), and the storage battery (205) is electrically connected to the micro air pump (202), the controller (203) and the display screen (204).

8. A battery pack performance tester according to claim 1, characterized in that: The detector body (20) further comprises a data interface (206) arranged on the top surface of the shell (201), and the data interface (206) is used to connect to the connector on the battery pack to obtain the OC signal, OD signal, BMS total pressure signal, BMS current signal or MBS load signal of the battery pack or a combination thereof.

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