Simple equipment for detecting voltage, internal resistance and temperature of battery module

Abstract

The utility model discloses simple equipment for detecting voltage, internal resistance and temperature of a battery module. The simple equipment comprises an equipment body, the detection module is connected with a to-be-detected battery module through a connecting line, and the connecting line comprises a transmission line and male heads arranged at the two ends of the transmission line; the male head at one end of the connecting line and the simple equipment are connected to the simple equipment plug-in interface female port, and the male head at the other end of the connecting line is connected to the battery module plug-in interface female port of the battery module; a voltage detection and calculation module and a resistance detection and temperature calculation module are integrated in the equipment body; the equipment body detects the voltage of the battery module through the voltage detection and calculation module; the device body detects the module internal resistance and temperature of the battery module through the resistance detection module and the temperature calculation module. The simple equipment provided by the utility model can conveniently detect the voltage, the internal resistance and the temperature of the module, judges whether the module is a good product or not, shortens the module screening and analysis time, and avoids the repair or scrapping of a battery PACK package caused by the use of a single string of battery modules with poor voltage or temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of battery module voltage, internal resistance and temperature detection, and in particular to a simple device for detecting battery module voltage, internal resistance and temperature, and specifically to a simple device that can be used to detect single-string voltage, total pressure, pressure difference, single-string internal resistance, total internal resistance, battery module temperature, ambient temperature and temperature difference of a battery module. Background Art

[0002] New energy vehicles have obvious advantages in environmental protection, energy saving, reducing energy dependence and operating costs. They have experienced explosive growth in recent years. As an important component supporting the development of the new energy vehicle industry, the demand for power batteries has also increased significantly.

[0003] Although the production process of battery modules is now basically fully automated, the battery module structure is delicate and complex, and has high requirements for personnel, equipment, raw materials, technology, and environment. Therefore, there are many modules with poor single-string voltage or temperature when they are sent to users and the after-sales market after production. Although many advanced equipment can quickly supervise the single-string voltage or temperature of the module through the module plug interface, they are too large to be transported, resulting in cumbersome after-sales troubleshooting if there is a problem with the module at the client or terminal market.

[0004] At present, there are also technical disclosures on portable battery module voltage testing devices on the market. For example, authorization announcement numbers CN215986410U and CN220207820U both disclose a portable battery module voltage measurement auxiliary device. However, this method has the following problems: first, a multimeter must be used separately for measurement, which is inconvenient to use; second, the module temperature and single-string internal resistance cannot be directly detected; third, there is a risk of metal short-circuiting to the fuse in the FPC harness in the terminal block or test hole.

[0005] In addition, there are two main technical methods for detecting the voltage, temperature and internal resistance of battery modules: the first method is to use a multimeter to detect the leads from the module socket. The disadvantage of this method is low efficiency. To detect the module voltage, you must first confirm the pin definition of the module, and then use a multimeter to detect the voltage of each string. There is also a risk of short-circuiting between the leads and melting the fuse in the battery module, causing the module to be scrapped; the second method is to send the battery module to the actual production line or use a testing cabinet for testing. The main disadvantage is that it is inconvenient and the module cannot be tested outside the factory.

[0006] Therefore, based on the above technical problems, technicians in this field urgently need to develop a simple device for detecting battery module voltage, internal resistance and temperature. Utility Model Content

[0007] The purpose of the utility model is to provide a simple device for detecting the voltage, internal resistance and temperature of a battery module. The simple device has the functions of detecting the single-string voltage, total pressure, pressure difference, temperature, single-string internal resistance and total internal resistance of the module, and is used for rapid identification or analysis of abnormal modules, and has the advantages of being portable and easy to operate.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] The utility model discloses a simple device for detecting voltage, internal resistance and temperature of a battery module, the simple device comprising:

[0010] The device body has a female port for a simple device plug interface, and a display screen is arranged on the surface of the device body;

[0011] The device body is connected to the battery module to be tested via a connecting line, wherein the connecting line includes a transmission line and male connectors arranged at both ends of the transmission line;

[0012] The male connector at one end of the connecting wire is connected to the female port of the simple device plug interface, and the male connector at the other end of the connecting wire is connected to the female port of the battery module plug interface of the battery module;

[0013] The device body is internally integrated with a voltage detection and calculation module and a resistance detection and temperature calculation module;

[0014] The device body detects the voltage of the battery module through the voltage detection and calculation module;

[0015] The device body detects the module internal resistance and temperature of the battery module through the resistance detection and temperature calculation module.

[0016] Furthermore, the voltage detection calculation module has:

[0017] A plurality of parallel voltage detection circuits, each of which is provided with a switch, and each voltage detection circuit corresponds to a string of cells in the battery module; and

[0018] A voltmeter is connected in series with all of the voltage sensing circuits.

[0019] Furthermore, the resistance detection and temperature calculation module has:

[0020] A series circuit, wherein a standard resistor, an ammeter, a current regulator and a switch are connected in series;

[0021] A control circuit and a voltmeter connected in parallel with the series circuit, wherein the control circuit controls switches to respectively detect the internal resistance of the battery and the NTC resistance value in the battery module;

[0022] The voltage detection and calculation module is connected to the control circuit of the resistance detection and temperature calculation module.

[0023] Furthermore, the current of the series circuit is regulated to a predetermined constant current value by the current regulator.

[0024] In the above technical solution, the utility model provides a simple device for detecting the voltage, internal resistance and temperature of a battery module, which has the following beneficial effects:

[0025] The simple device of the utility model can conveniently detect the module voltage, internal resistance and temperature, determine whether the module is good, shorten the module screening and analysis time, and avoid the use of a single string of battery modules with poor voltage or temperature causing the battery PACK package to be returned for repair or scrapped. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0027] Figure 1 A wiring diagram of a simple device for detecting voltage, internal resistance and temperature of a battery module provided by an embodiment of the utility model and connected to a battery module;

[0028] Figure 2 A schematic diagram of a simple device for detecting voltage, internal resistance and temperature of a battery module provided by an embodiment of the utility model;

[0029] Figure 3 A schematic diagram of the structure of a simple device for detecting voltage, internal resistance and temperature of a battery module and a connecting line for connecting the battery module provided by an embodiment of the utility model;

[0030] Figure 4 A schematic diagram of the structure of a simple device for detecting battery module voltage, internal resistance and temperature provided by an embodiment of the utility model;

[0031] Figure 5 A schematic diagram of the working state of a simple device for detecting the voltage, internal resistance and temperature of a battery module provided by an embodiment of the utility model and connected to a battery module.

[0032] Description of reference numerals:

[0033] 1. Male connector; 2. Transmission line; 3. Battery indicator light; 4. Display screen; 5. Plastic shell; 6. Charging port; 7. Warning light; 8. Power button; 9. Female connector for simple device interface; 10. Female connector for battery module interface; 11. Battery module; 12. Connecting line; 13. Simple device.

[0034] 101. Voltage detection and calculation module; 102. Resistance detection and temperature calculation module. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0036] See also Figures 1 to 5 As shown;

[0037] This embodiment discloses a simple device for detecting the voltage, internal resistance and temperature of a battery module. The simple device 13 includes:

[0038] The device body has a simple device plug interface female port 9, and a display screen 4 is arranged on the surface of the device body;

[0039] The device body is connected to the battery module 11 to be tested via a connecting line, and the connecting line 12 includes a transmission line 2 and male connectors 1 arranged at both ends of the transmission line 2;

[0040] The male connector 1 at one end of the connecting wire 12 is connected to the female port 9 of the simple device plug interface with the simple device 13, and the male connector 1 at the other end of the connecting wire 12 is connected to the female port 10 of the battery module plug interface of the battery module 11;

[0041] The device body is internally integrated with a voltage detection and calculation module 101 and a resistance detection and temperature calculation module 102;

[0042] The device body detects the voltage of the battery module through the voltage detection calculation module 101;

[0043] The device body detects the internal resistance and temperature of the battery module through the resistance detection and temperature calculation module 102 .

[0044] Specifically, this embodiment discloses a simple device 13 for detecting the voltage, internal resistance and temperature of a battery module, which uses a device body as a main mechanism, and integrates a display screen 4 and a switch for controlling the device on and off in order to display the detection data. The simple device 13 of this embodiment is connected to the battery module 11 via a connecting line 12, so the connecting line 12 of this embodiment needs to have male connectors 1 at both ends, and the male connector 1 needs to be connected to the female port 9 of the simple device 13 and the female port 10 of the battery module plug interface.

[0045] In order to detect the voltage, internal resistance and temperature of the battery module 11 , a voltage detection and calculation module 101 and a resistance detection and temperature calculation module 102 are integrated in the device body of this embodiment.

[0046] Preferably, the voltage detection calculation module 101 of this embodiment has:

[0047] A plurality of parallel voltage detection circuits, each of which is provided with a switch, and each voltage detection circuit corresponds to a string of cells in the battery module; and

[0048] A voltmeter is placed in series with all voltage sensing circuits.

[0049] Preferably, the resistance detection and temperature calculation module 102 of this embodiment has:

[0050] A series circuit, in which a standard resistor, an ammeter, a current regulator and a switch are connected in series;

[0051] A control circuit and a voltmeter are connected in parallel with the series circuit, and the control circuit controls the switch to detect the internal resistance of the battery and the NTC resistance value in the battery module respectively;

[0052] The voltage detection and calculation module is connected to the control circuit of the resistance detection and temperature calculation module.

[0053] Preferably, the current of the series circuit of this embodiment is regulated to a predetermined constant current value by a current regulator.

[0054] Among them, the control circuit involved in this embodiment adopts the UC3842 switching power supply chip of Onbao Electronics. After the switching power supply chip receives the potential signal of the connected module, it controls the V1 corresponding switch of the voltage detection and calculation module 101 to close. After the voltmeter detects the V1 potential, the switching power supply chip disconnects the V1 corresponding switch and closes the V2 corresponding switch, completing the detection of V1-V7 potentials in sequence.

[0055] See also Figure 2 As shown, Figure 2The principle of voltage detection of the battery module 11 by the simple device 13 of this embodiment is shown. The positive and negative contacts of a single string of cells are connected to the corresponding voltage detection circuit in the simple device through connecting wires. Each voltage detection circuit is provided with a switch, and all switches are connected in series with a voltmeter. The voltmeter is connected to the standard electrode V0, and the potential of the standard electrode is 0V. The switches are closed in sequence to measure the potentials V1, V2, V3, V4, V5, V6, and V7 of the positive and negative electrodes of each string of cells. The measured potentials are arranged in order from low to high, that is, the first string, the second string, the third string, etc. of the cells in the battery module 11 are determined. The difference between the two adjacent potentials is the voltage value of the 6 strings of cells. The difference between the highest potential and the lowest potential is the total voltage of the battery module. The maximum single string voltage minus the minimum single string voltage is the maximum pressure difference. The device can also set the single string voltage, total voltage, and pressure difference range. If the difference is exceeded, the device will automatically alarm, which is used to quickly screen the battery module 11.

[0056] See also Figure 2 As shown, Figure 2 The principle of detecting the module internal resistance and temperature of the battery module 11 by the simple device 13 of this embodiment is also shown. The standard resistor R0, the ammeter, the current regulator, and the switch circuit form a series circuit, the voltmeter is connected in parallel with the above series circuit, the control circuit controls the switch to detect the battery internal resistance and the NTC resistance value respectively, and the current regulator is used to adjust the current in the discharge circuit to a predetermined constant current value. The positive and negative pole information of the string sequence determined by the voltage detection module is connected to the positive and negative poles of the single string battery cell respectively. The open circuit voltage U1 of the circuit is first detected, the switch is closed, and the ammeter detects the value I. According to the formula R=(U1-R0*I) / I, the DC internal resistance of the battery can be calculated. The two ends of the NTC are connected to the circuit respectively, the control circuit controls the switch to connect to the NTC detection circuit, the voltmeter detects the voltage value U2, and the ammeter detects the value I1. According to the formula R=U2 / I1, the NTC resistance value can be calculated. The device obtains the module temperature data according to the RT temperature sense comparison table, and the module temperature difference value is obtained by subtracting the module temperature data.

[0057] The specific steps of the simple device 13 of this embodiment to detect the battery module 11 are as follows:

[0058] Step 1: Place the battery module 11 to be tested steadily and make sure that the female connector 10 of the battery module is intact;

[0059] Step 2: Press the power button 8 of the simple device 13 for detecting the voltage, internal resistance and temperature of the battery module. After the simple device is turned on, first confirm whether the power of the simple device is sufficient through the power indicator light 3 (if insufficient, use a charger to charge through the charging port 6), and then wait for the simple device to complete the self-test. If "Self-test OK" is displayed on the display screen 4, it can be used normally; if the simple device 13 displays "abnormal voltage" or "abnormal resistance", the warning light 7 flashes, and the simple device 13 needs to be replaced.

[0060] Step 3: Insert the male connector 1 at one end of the connecting line 12 into the female port 9 of the simple device interface, and insert the male connector 1 at the other end into the female port 10 of the battery module interface, and place the simple device 13 stably.

[0061] Step 4: Click the "Detect" button on the simple device display screen 4 and wait for the device to complete the detection. Finally, the display screen 4 will display the single-string voltage, total voltage, pressure difference, single-string internal resistance, total internal resistance, battery module temperature, ambient temperature, and temperature difference information of the battery module.

[0062] In the above technical solution, the utility model provides a simple device for detecting the voltage, internal resistance and temperature of a battery module, which has the following beneficial effects:

[0063] The simple device 13 of the utility model can conveniently detect the module voltage, internal resistance and temperature, determine whether the module is good, shorten the module screening and analysis time, and avoid the use of a single string of battery modules with poor voltage or temperature, resulting in the return or scrapping of the battery PACK package.

[0064] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A simple device for detecting battery module voltage, internal resistance and temperature, characterized in that: The simple device (13) comprises: A device body, wherein the device body is provided with a simple device plug interface female port (9), and a display screen (4) is arranged on the surface of the device body; The device body is connected to the battery module (11) to be tested via a connecting line (12), wherein the connecting line (12) comprises a transmission line (2) and male connectors (1) arranged at both ends of the transmission line (2); The male connector (1) at one end of the connecting wire (12) and the simple device (13) are connected to the female connector (9) of the simple device plug interface, and the male connector (1) at the other end of the connecting wire (12) is connected to the female connector (10) of the battery module plug interface of the battery module (11); The device body is internally integrated with a voltage detection and calculation module (101) and a resistance detection and temperature calculation module (102); The device body detects the voltage of the battery module (11) through the voltage detection and calculation module (101); The device body detects the module internal resistance and temperature of the battery module (11) through the resistance detection and temperature calculation module (102).

2. A simple device for detecting battery module voltage, internal resistance and temperature according to claim 1, characterized in that: The voltage detection calculation module (101) comprises: A plurality of parallel voltage detection circuits, each of which is provided with a switch, and each voltage detection circuit corresponds to a string of cells in the battery module (11); and a voltmeter connected in series with all of the voltage detection circuits.

3. A simple device for detecting battery module voltage, internal resistance and temperature according to claim 1 or 2, characterized in that: The resistance detection and temperature calculation module (102) comprises: A series circuit, wherein a standard resistor, an ammeter, a current regulator and a switch are connected in series; A control circuit and a voltmeter connected in parallel with the series circuit, wherein the control circuit controls switches to respectively detect the internal resistance of the battery and the NTC resistance value in the battery module; The voltage detection and calculation module is connected to the control circuit of the resistance detection and temperature calculation module.

4. A simple device for detecting battery module voltage, internal resistance and temperature according to claim 3, characterized in that: The current of the series circuit is regulated to a predetermined constant current value by the current regulator.

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