Rapid detection device for battery pack cell assembly

Abstract

The utility model relates to a rapid detection device for battery pack cell assembly, which comprises a single detection circuit, the single detection circuit comprises a light emitting diode, and the single detection circuit further comprises a capacitor and a resistor which are connected with the light emitting diode in series. According to the utility model, the resistor and the capacitor are combined to form the RC delay turn-off loop for realizing circuit delay turn-off, and when the battery module of the battery pack is detected, if all battery cell monomers of the battery module are correctly assembled, the light emitting diodes of the monomer detection circuits are simultaneously lightened and the brightness of the light emitting diodes is approximately consistent; after a certain period of time, the capacitor is fully charged to disconnect the loop and extinguish the light-emitting diode, so that the consistency of the power consumption of the battery cell monomers is ensured, and the difference between the electric quantities of the battery cell monomers can be controlled; and if a certain battery cell monomer in the battery module is wrongly assembled, the light-emitting diode in the monomer detection circuit corresponding to the battery cell monomer does not emit light, so that the detection result is more visual.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, and in particular to a rapid testing device for battery pack cell assembly. Background Technology

[0002] Electric vehicles are a new energy industry strongly promoted by the country. As a vehicle that relies on electric power, the core component of a battery electric vehicle is the battery pack. Before assembling the BMS (Battery Management System), it is necessary to test the battery pack cell assembly to avoid problems such as missing or incorrect cell connections after the battery pack is assembled. This could affect the normal operation of the BMS board, or even damage the cells and BMS data acquisition board, thereby affecting the assembly efficiency of the production line and increasing the assembly cost.

[0003] For example, patent CN214409224U discloses a testing fixture for a battery pack. This fixture includes a fixture plate and at least one access unit mounted on the fixture plate and corresponding to a battery module. Each access unit on the fixture plate has a multi-channel cell detection circuit. The access unit associates multiple battery cells with the corresponding multi-channel cell detection circuits. When a battery cell is correctly assembled, the LEDs at each port light up simultaneously with approximately uniform brightness. If a battery cell is incorrectly assembled, its corresponding LED and the LEDs following it do not light up, thus enabling the testing of the battery cell. However, this testing fixture suffers from drawbacks. Manual connection of the interfaces can easily cause differences in interface contact time, continuously consuming the battery cell's charge and creating variations in the charge levels between individual cells, thereby affecting the entire battery pack. Utility Model Content

[0004] Based on this, it is necessary to address the technical problem that current testing fixtures, due to the manual connection of interfaces, are prone to causing differences in interface contact time, which continuously consumes the power of individual cells and leads to some differences in the power of individual cells, thus affecting the entire battery pack. This utility model provides a rapid testing device for battery pack cell assembly.

[0005] This utility model proposes a rapid testing device for battery pack cell assembly, which includes a single cell testing circuit. The single cell testing circuit includes a light-emitting diode (LED), and the single cell testing circuit also includes a capacitor and a resistor connected in series with the LED.

[0006] This invention improves upon the single-cell detection circuit in existing testing fixtures by adding a resistor and capacitor connected in series with the LED. The combination of resistor (R) and capacitor (C) forms an RC delay shutdown circuit, enabling delayed circuit shutdown. When testing the battery modules of a battery pack: if all the individual cells in the battery module are correctly assembled, the LEDs in each single-cell detection circuit will light up simultaneously with approximately uniform brightness. After a certain time, the capacitor fully charges, breaking the circuit and turning off the LEDs, ensuring consistent power consumption across all cells and controlling differences in cell charge levels. If a single cell in the battery module is incorrectly assembled, the LED in the corresponding single-cell detection circuit will not light up, providing a more intuitive testing result.

[0007] As a further improvement to the above-mentioned solution of this utility model, the single-unit detection circuit further includes a fuse, which is connected in series with the light-emitting diode, the capacitor, and the resistor.

[0008] As a further improvement of the above-mentioned solution of this utility model, the battery pack includes several battery modules, each of which includes multiple battery cells connected in series; the battery pack cell assembly rapid testing device also includes a tooling plate, the tooling plate is provided with a connector port and the tooling plate integrates multiple cell detection circuits, the connector port and the multiple cell detection circuits form a testing unit, the connector port is used to associate the multiple cell detection circuits with multiple battery cells of a battery module respectively, and the output voltage of the cell provides power to the associated cell detection circuit.

[0009] As a further improvement to the above-mentioned solution of this utility model, the number of detection units is consistent with the number of battery modules in the battery pack.

[0010] As a further improvement to the above-mentioned solution of this utility model, the connector port adopts a wire harness connector.

[0011] As a further improvement to the above-mentioned solution of this utility model, the resistance value of the resistor is 8-15kΩ.

[0012] As a further improvement to the above-mentioned solution of this utility model, the capacitance of the capacitor is 15-25uF.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This invention improves upon the single-cell detection circuit in existing testing fixtures by adding a resistor and capacitor connected in series with the LED. The combination of resistor (R) and capacitor (C) forms an RC delay shutdown circuit, enabling delayed circuit shutdown. When testing the battery modules of a battery pack: if all the individual cells in the battery module are correctly assembled, the LEDs in each single-cell detection circuit will light up simultaneously with approximately uniform brightness. After a certain time, the capacitor fully charges, breaking the circuit and turning off the LEDs, ensuring consistent power consumption across all cells and controlling differences in cell charge levels. If a single cell in the battery module is incorrectly assembled, the LED in the corresponding single-cell detection circuit will not light up, providing a more intuitive testing result.

[0015] This invention can quickly and intuitively detect the assembly status of individual cells in a battery pack. It is low in cost, facilitates intuitive inspection in production and improves production line efficiency. It can also effectively shut down circuits to control the capacity dissipation differences between cells, ensuring that the capacity of individual cells in the battery pack is relatively consistent. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a rapid testing device for battery pack cell assembly proposed in an embodiment of the present invention;

[0017] Figure 2 This is a circuit diagram of a rapid testing device for battery pack cell assembly proposed in an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the single-cell detection circuit in a rapid testing device for battery pack cell assembly proposed in an embodiment of the present invention. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] A battery pack typically includes at least one battery module, and each battery module comprises multiple individual battery cells connected in series. Each individual battery cell has a voltage of approximately 3.3V when it comes off the production line. This embodiment uses a battery pack consisting of four battery modules connected in series, with each battery module comprising 14 individual battery cells connected in series, as an example for illustration.

[0021] Reference Figure 1-3This embodiment provides a rapid testing device for battery pack cell assembly, including a tooling plate and multiple testing units. Each testing unit includes a connector port and multiple individual cell testing circuits.

[0022] The number of detection units can be adapted to the number of battery modules, with one detection unit corresponding to one battery module. Furthermore, the number of individual detection circuits in each detection unit is adapted to the number of individual battery cells in the battery module, ensuring that one individual battery cell corresponds to one individual detection circuit. In this embodiment, four detection units are provided, and the connectors of the four detection units respectively correspond to… Figure 1 and Figure 2 Ports A, B, C, and D in the system are equipped with 14 individual cell detection circuits in each detection unit. The 14 individual cells of the battery module are associated with the 14 individual cell detection circuits through the connector ports.

[0023] Combination Figure 3 Each individual detection circuit includes a fuse, a light-emitting diode, a resistor, and a capacitor connected in series. Figure 3 F1-F14 in the diagram refer to the fuses for the 14-channel individual unit detection circuit. Figure 3 D1-D14 in the diagram refer to the LEDs in the 14-channel individual sensor detection circuit. Figure 3 R1-R14 in the diagram represent the resistors for the 14-channel individual detection circuit. Figure 3 C1-C14 in the diagram represent the capacitors for the 14-channel individual cell detection circuit. Since the finished battery cell has approximately 3.3V, it can directly power the individual cell detection circuit. The input voltages for the individual cells are MC01-MC14 (MC0N ​​represents the battery voltage of the first N strings of cells in the battery module; for example, MC014 represents the battery voltage of the 14 strings of cells in the battery module), and MC00 represents the output to the negative terminal of the entire battery module. In each individual cell detection circuit, an RC delay shutdown loop is formed by combining resistors and capacitors to achieve delayed circuit shutdown. The resistance of each individual cell detection circuit is 8-15kΩ, and the capacitance is 15-25uF. In this embodiment, the resistance of each individual detection circuit is 10kΩ and the capacitance is 22uF. According to the formula τ=RC (τ is the charging time), the capacitor is fully charged in 0.8s (4τ), that is, the LED light lasts for 0.8s. In other words, after 0.8s, the capacitor is fully charged, which causes the circuit to break and the LED to turn off.

[0024] With the above structural setup, when testing the battery pack, the four battery modules of the battery pack are connected to ports A, B, C, and D respectively. If all the individual cells in each battery module are correctly assembled, the LEDs in the detection circuits of each cell will light up simultaneously with approximately the same brightness. After 0.8 seconds, the capacitor is fully charged, breaking the circuit and turning off the LEDs, ensuring the consistency of power consumption of each individual cell and thus controlling the difference in power between individual cells. If a cell in the battery module is assembled incorrectly, the LED in the detection circuit corresponding to that cell will not light up, making the test results more intuitive.

[0025] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0026] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A rapid testing device for battery pack cell assembly, comprising a single-cell testing circuit, wherein the single-cell testing circuit includes a light-emitting diode, characterized in that, The individual detection circuit also includes a capacitor and a resistor connected in series with the light-emitting diode. The resistor and the capacitor together form an RC delay shutdown loop to achieve delayed circuit shutdown.

2. The rapid testing device for battery pack cell assembly according to claim 1, characterized in that, The individual detection circuit also includes a fuse, which is connected in series with the light-emitting diode, the capacitor, and the resistor.

3. The rapid testing device for battery pack cell assembly according to claim 1, characterized in that, The battery pack includes several battery modules, each of which includes multiple battery cells connected in series. The rapid testing device for battery cell assembly in the battery pack also includes a tooling plate with connector ports and multiple cell detection circuits integrated on the tooling plate. The connector ports and the multiple cell detection circuits form a testing unit. The connector ports are used to associate the multiple cell detection circuits with multiple battery cells of a battery module, and the output voltage of the battery cell provides power to the associated cell detection circuit.

4. The rapid testing device for battery pack cell assembly according to claim 3, characterized in that, The number of detection units is the same as the number of battery modules in the battery pack.

5. The rapid testing device for battery pack cell assembly according to claim 3 or 4, characterized in that, The connector is a wire harness connector.

6. The rapid testing device for battery pack cell assembly according to any one of claims 1-4, characterized in that, The resistance value of the resistor is 8-15kΩ.

7. The rapid testing device for battery pack cell assembly according to any one of claims 1-4, characterized in that, The capacitance of the capacitor is 15-25uF.

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