Method for assembling long-size high-weight battery module

Abstract

The invention discloses an assembly method of a long-size high-weight battery module, and relates to the field of assembly of battery modules, and the assembly method comprises the following steps: S1, preparing an assembly fixture body; s2, screening and pairing the battery units; s3, stacking and fixing the battery units; s4, electrically connecting the battery module body; and S5, performing thermal management on the battery module body. According to the assembly method of the long-size and high-weight battery module, the battery units are screened and paired, so that the battery module can stably and efficiently work in the use process, poor contact, electric quantity loss and inconsistent charging and discharging of a battery module body can be avoided, and the service life of the battery module is prolonged. According to the battery module assembly fixture, the electric quantity loss of each battery unit in the long-term storage and use process of the battery module can be ensured to be consistent, the internal space of the assembly fixture body can be adjusted according to the use requirements through the arranged assembly fixture body, and the assembly fixture body can be adapted to a long-size and high-weight battery module body, so that the assembly range of the assembly fixture body can be ensured.

Description

Technical Field

[0001] The invention relates to the field of battery module assembly, and in particular to an assembly method for a long-size and high-weight battery module. Background Art

[0002] A battery module is a battery assembly consisting of multiple battery cells connected in series, parallel, or a combination of series and parallel. It is an intermediate unit between a single battery cell and a complete battery system.

[0003] There is a lack of good assembly methods for long, heavy battery modules, and long, heavy battery modules require more battery cells to be assembled together. Different battery cells cannot be well adapted, which affects the performance of the assembled battery modules to a certain extent.

[0004] Therefore, it is necessary to propose an assembly method for a long-sized and high-weight battery module to solve the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide an assembly method for a long-sized and high-weight battery module, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A method for assembling a long and heavy battery module comprises the following steps:

[0008] S1: Prepare an assembly fixture body, wherein bearing seats are symmetrically installed at both ends of the top of the assembly fixture body, two-way screw rods are installed on opposite sides of the two bearing seats, and a driving motor is installed on the outer wall of the assembly fixture body, and the driving motor is connected to the two-way screw rod through a driving shaft;

[0009] The two ends of the top of the assembly fixture body are symmetrically and movably connected with clamping plates, and the bottoms of the two clamping plates on opposite sides are symmetrically installed with assembly seats, and the center of the bottom of the assembly seat is threadedly connected to the outer wall of the bidirectional screw rod;

[0010] A guide rail is installed on the top of the assembly fixture body, the bottom of the assembly seat is movably connected to the outer wall of the guide rail, a linear motor is installed in the inner cavity of the clamping plate at one end, and a connecting frame is installed at the driving end of the linear motor;

[0011] S2: Battery cell screening and pairing, which uses high-precision testing equipment to screen and pair battery cells to ensure that the performance and capacity of the battery cells are consistent;

[0012] S3: stacking and fixing the battery cells, stacking the screened and matched battery cells together according to the design requirements, and fixing them in the module frame by assembling the fixture body, so as to form the battery module body;

[0013] S4: Electrical connection of the battery module body, prepare the connecting parts of the battery cells, clean and pre-treat the welding surface of the connecting parts of the battery cells, remove oil stains and oxides, place the battery cells according to the design requirements, adjust the parameters of the laser welding equipment, so that the laser beam accurately irradiates the connection parts for welding, and after welding is completed, check the welding quality, including appearance inspection and electrical performance test;

[0014] S5: Thermal management of the battery module body: installing a heat dissipation device to perform thermal management on the battery module body, thereby completing the assembly of the battery module body.

[0015] Preferably, there are four groups of guide rails, and both sides of the bottom of the two assembly seats are movably connected to the outer walls of the four groups of guide rails.

[0016] Preferably, in S2, the battery cell screening and pairing specifically includes the following operation steps:

[0017] S201: Capacity test, using a high-precision battery charge and discharge tester to precisely control the charge and discharge current and voltage, and record relevant data. Multiple battery cells are tested simultaneously, and battery cells with a capacity difference within ±2% are paired together;

[0018] S202: Internal resistance test, using a battery internal resistance tester, pairing battery cells with internal resistance differences within ±10% together;

[0019] S203: open circuit voltage test, using a high-precision voltmeter to measure the open circuit voltage of the battery, and pairing the battery cells with an open circuit voltage difference within ±50mV;

[0020] S204: self-discharge rate test, using a constant temperature box to control the test environment temperature and a high-precision voltmeter to measure the voltage, and selecting battery cells with a self-discharge rate difference within ±0.1% for pairing;

[0021] S205: Dynamic performance test, using a battery testing system that can simulate different charge and discharge rates, and a temperature sensor to monitor the temperature changes of the battery cells during the charge and discharge process. Based on the results of the dynamic performance test, battery cells with similar performance under simulated actual working conditions are paired together.

[0022] Preferably, in S3, stacking and fixing the battery cells specifically include the following steps:

[0023] S301: Prepare a frame of appropriate size, place it on the top of the assembly fixture body, connect it to one end of the frame through a connecting frame, start the drive motor, drive the bidirectional screw to rotate, so that the bottom of the assembly seat can be threadedly connected with the bidirectional screw, and then drive the clamping plates at both ends to move to the opposite side, so that the frame can be clamped;

[0024] S302: Start the linear motor and drive the frame to move through the connecting frame. After the frame is moved to a suitable position, the selected and matched battery cells can be stacked together according to the design requirements. After stacking, they are installed in the inner cavity of the frame to form a battery module body.

[0025] Preferably, the S4 further includes connection between the conductive glue and the flexible circuit board, wherein the connection of the conductive glue: select a suitable conductive glue, match it according to the material of the battery connection component and the working environment, evenly apply the conductive glue on the connection part, and then fit the battery unit and the connection component together according to the design requirements, and cure it according to the curing requirements of the conductive glue. After the curing is completed, check the firmness and electrical performance of the connection;

[0026] Connection of flexible circuit boards: Design the circuit layout of the flexible circuit board to meet the electrical connection requirements of the battery module body, connect the flexible circuit board to the battery tabs by welding. After the connection is completed, check the connection quality of the flexible circuit board, including the conductivity of the circuit, whether there is a short circuit, whether the installation position of the flexible circuit board in the battery module body is correct, and whether it will be squeezed or rubbed.

[0027] Preferably, in S5, the thermal management of the battery module body specifically includes the following operation steps:

[0028] S501: Design the layout of the water cooling pipes, fit the water cooling pipes tightly to the heating parts of the battery module body, install a water pump in the water cooling pipes to drive the coolant circulation, and configure a heat exchanger, a temperature sensor and a control system to adjust the flow of the water pump and the working state of the heat exchanger according to the temperature of the battery module;

[0029] S502: Encapsulate the phase change material in a suitable container, and then install the container inside the battery module body. During the installation process, ensure that the phase change material has good thermal contact with the battery module.

[0030] Compared with the prior art, the present invention provides an assembly method for a long-sized and high-weight battery module, which has the following beneficial effects:

[0031] The assembly method of the long-sized and high-weight battery module can ensure that the battery module can work stably and efficiently during actual use by screening and pairing the battery cells, can avoid poor contact, power loss, and inconsistent charging and discharging of the battery module body during operation, and can ensure that the power loss of each battery cell in the battery module is relatively consistent during long-term storage and use. By setting up an assembly fixture body, when assembling the battery module body, its internal space can be adjusted according to use requirements, so that it can adapt to assembly of battery module bodies of various sizes, and can also adapt to long-sized and high-weight battery module bodies, so that the assembly range of the assembly fixture body can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the present invention after assembly;

[0033] Figure 2 It is a structural schematic diagram of the assembly fixture body of the present invention.

[0034] In the figure: 1. Assembly fixture body; 2. Support column; 3. Bearing seat; 4. Bidirectional screw; 5. Drive motor; 6. Guide rail; 7. Assembly seat; 8. Clamp; 9. Linear motor; 10. Connecting frame; 11. Battery module body. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0036] like Figure 1-2 As shown, a method for assembling a long-sized and high-weight battery module includes the following steps:

[0037] S1: Prepare to assemble the fixture body 1. Bearing seats 3 are symmetrically installed at both ends of the top of the fixture body 1. Bidirectional screw rods 4 are installed on opposite sides of the two bearing seats 3. A driving motor is installed on the outer wall of the fixture body 1. The driving motor is connected to the bidirectional screw rod 4 through a driving shaft.

[0038] The two ends of the top of the assembly fixture body 1 are symmetrically and movably connected with clamping plates 8, and the bottom of the two clamping plates 8 on the opposite side is symmetrically installed with an assembly seat 7, and the center of the bottom of the assembly seat 7 is threadedly connected to the outer wall of the bidirectional screw rod 4;

[0039] A guide rail 6 is installed on the top of the assembly fixture body 1, and there are four groups of guide rails 6. Both sides of the bottom of the two assembly seats 7 are movably connected to the outer walls of the four groups of guide rails 6. The bottom of the assembly seat 7 is movably connected to the outer wall of the guide rail 6. A linear motor 9 is installed in the inner cavity of a clamping plate 8 at one end, and a connecting frame 10 is installed at the driving end of the linear motor 9.

[0040] S2: Battery cell screening and pairing, using high-precision testing equipment to screen and pair battery cells to ensure that the performance and capacity of the battery cells are consistent, including the following steps:

[0041] S201: Capacity test, using a high-precision battery charge and discharge tester to precisely control the charge and discharge current and voltage, and record relevant data. Multiple battery cells are tested simultaneously, and battery cells with a capacity difference within ±2% are paired together;

[0042] S202: Internal resistance test, using a battery internal resistance tester, pairing battery cells with internal resistance differences within ±10% together;

[0043] S203: open circuit voltage test, using a high-precision voltmeter to measure the open circuit voltage of the battery, and pairing the battery cells with an open circuit voltage difference within ±50mV;

[0044] S204: self-discharge rate test, using a constant temperature box to control the test environment temperature and a high-precision voltmeter to measure the voltage, and selecting battery cells with a self-discharge rate difference within ±0.1% for pairing;

[0045] S205: Dynamic performance test, using a battery test system that can simulate different charge and discharge rates, and a temperature sensor to monitor the temperature change of the battery cell during the charge and discharge process. Based on the results of the dynamic performance test, the battery cells with similar performance under simulated actual working conditions are paired together;

[0046] S3: stacking and fixing battery cells, stacking the screened and matched battery cells together according to the design requirements, and fixing them in the module frame by assembling the fixture body 1, so as to form a battery module body 11, specifically including the following operation steps:

[0047] S301: Prepare a frame of suitable size, place it on the top of the assembly fixture body 1, connect it to one end of the frame through the connecting frame 10, start the driving motor 5, drive the bidirectional screw 4 to rotate, so that the bottom of the assembly seat 7 can be threadedly connected with the bidirectional screw 4, and then drive the clamping plates 8 at both ends to move to the opposite side, so that the frame can be clamped;

[0048] S302: Start the linear motor 9 to drive the frame to move through the connecting frame 10. After the frame is moved to a suitable position, the selected and matched battery cells can be stacked together according to the design requirements. After stacking, the battery cells are installed in the inner cavity of the frame to form a battery module body 11.

[0049] S4: Electrical connection of the battery module body 11, preparing the connecting parts of the battery cells, cleaning and pre-treating the welding surfaces of the connecting parts of the battery cells, removing oil stains and oxides, placing the battery cells according to the design requirements, adjusting the parameters of the laser welding equipment, so that the laser beam is accurately irradiated on the connecting parts for welding, and after the welding is completed, inspecting the welding quality, including appearance inspection and electrical performance test;

[0050] It also includes the connection between the conductive glue and the flexible circuit board, wherein the connection of the conductive glue: select the appropriate conductive glue, match it according to the material of the battery connection component and the working environment, evenly apply the conductive glue on the connection part, and then fit the battery unit and the connection component together according to the design requirements, and cure it according to the curing requirements of the conductive glue. After the curing is completed, check the firmness of the connection and the electrical performance;

[0051] Connection of the flexible circuit board: Design the circuit layout of the flexible circuit board to meet the electrical connection requirements of the battery module body 11, connect the flexible circuit board to the battery tab by welding, and after the connection is completed, check the connection quality of the flexible circuit board, including the conductivity of the circuit, whether there is a short circuit, whether the installation position of the flexible circuit board in the battery module body 11 is correct, and whether it will be squeezed or rubbed;

[0052] S5: Thermal management of the battery module body 11, installing a heat dissipation device to perform thermal management on the battery module body 11, thereby completing the assembly of the battery module body 11, specifically including the following steps:

[0053] S501: Design the layout of the water cooling pipe, fit the water cooling pipe tightly to the heating part of the battery module body 11, install a water pump in the water cooling pipe to drive the coolant circulation, and configure a heat exchanger, a temperature sensor and a control system to adjust the flow of the water pump and the working state of the heat exchanger according to the temperature of the battery module;

[0054] S502: The phase change material is packaged in a suitable container, and then the container is installed inside the battery module body 11. During the installation process, it is necessary to ensure that the phase change material has good thermal contact with the battery module.

[0055] By screening and pairing the battery cells, it can be ensured that the battery module can work stably and efficiently during actual use, and poor contact, power loss, and inconsistent charging and discharging of the battery module body 11 during operation can be avoided. It can ensure that the power loss of each battery cell in the battery module is relatively consistent during long-term storage and use. Through the set assembly fixture body 1, when assembling the battery module body 11, its internal space can be adjusted according to usage requirements, so that it can adapt to battery module bodies 11 of various sizes for assembly, and can also adapt to long and heavy battery module bodies 11, so that the assembly range of the assembly fixture body 1 can be guaranteed.

[0056] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for assembling a long and heavy battery module, characterized in that: The steps include: S1: preparing an assembly fixture body (1), bearing seats (3) are symmetrically installed at both ends of the top of the assembly fixture body (1), two bidirectional screw rods (4) are installed on opposite sides of the two bearing seats (3), a servo motor (5) is installed on the outer wall of the assembly fixture body (1), the servo motor (5) is connected to the bidirectional screw rod (4) through a drive shaft, and a support column (2) is installed at the bottom of the assembly fixture body (1); The two ends of the top of the assembly fixture body (1) are symmetrically and movably connected with clamping plates (8), and the bottoms of the two clamping plates (8) on opposite sides are symmetrically installed with assembly seats (7), and the center of the bottom of the assembly seat (7) is threadedly connected to the outer wall of the bidirectional screw rod (4); A guide rail (6) is installed on the top of the assembly fixture body (1), the bottom of the assembly seat (7) is movably connected to the outer wall of the guide rail (6), a linear motor (9) is installed in the inner cavity of the clamping plate (8) at one end, and a connecting frame (10) is installed at the driving end of the linear motor (9); S2: Battery cell screening and pairing, which uses high-precision testing equipment to screen and pair battery cells to ensure that the performance and capacity of the battery cells are consistent; S3: stacking and fixing the battery cells, stacking the screened and matched battery cells together according to the design requirements, and fixing them in the module frame by assembling the fixture body (1), so as to form a battery module body (11); S4: Electrical connection of the battery module body (11), preparing the connecting parts of the battery cells, cleaning and pre-treating the welding surfaces of the connecting parts of the battery cells to remove oil stains and oxides, placing the battery cells according to the design requirements, adjusting the parameters of the laser welding equipment so that the laser beam is accurately irradiated on the connecting parts for welding, and after the welding is completed, inspecting the welding quality, including appearance inspection and electrical performance test; S5: thermal management of the battery module body (11), installing a heat dissipation device to perform thermal management on the battery module body (11), thereby completing the assembly of the battery module body (11).

2. The method for assembling a long-sized and high-weight battery module according to claim 1, characterized in that: There are four groups of guide rails (6), and both sides of the bottom of the two assembly seats (7) are movably connected to the outer walls of the four groups of guide rails (6).

3. The method for assembling a long and heavy battery module according to claim 1, characterized in that: In S2, the battery cell screening and pairing specifically include the following operation steps: S201: Capacity test, using a high-precision battery charge and discharge tester to precisely control the charge and discharge current and voltage, and record relevant data. Multiple battery cells are tested simultaneously, and battery cells with a capacity difference within ±2% are paired together; S202: Internal resistance test, using a battery internal resistance tester, pairing battery cells with internal resistance differences within ±10% together; S203: open circuit voltage test, using a high-precision voltmeter to measure the open circuit voltage of the battery, and pairing the battery cells with an open circuit voltage difference within ±50mV; S204: self-discharge rate test, using a constant temperature box to control the test environment temperature and a high-precision voltmeter to measure the voltage, and selecting battery cells with a self-discharge rate difference within ±0.1% for pairing; S205: Dynamic performance test, using a battery testing system that can simulate different charge and discharge rates, and a temperature sensor to monitor the temperature changes of the battery cells during the charge and discharge process. Based on the results of the dynamic performance test, battery cells with similar performance under simulated actual working conditions are paired together.

4. The method for assembling a long and heavy battery module according to claim 1, characterized in that: In S3, the stacking and fixing of the battery cells specifically includes the following steps: S301: Prepare a frame of suitable size, place it on the top of the assembly fixture body (1), connect it to one end of the frame through the connecting frame (10), start the servo motor (5), drive the bidirectional screw rod (4) to rotate, so that the bottom of the assembly seat (7) can be threadedly connected with the bidirectional screw rod (4), and then drive the clamping plates (8) at both ends to move to the opposite side, so that the frame can be clamped; S302: Start the linear motor (9) and drive the frame to move through the connecting frame (10). After the frame is moved to a suitable position, the selected and matched battery cells can be stacked together according to the design requirements. After stacking, they are installed in the inner cavity of the frame to form a battery module body (11).

5. The method for assembling a long and heavy battery module according to claim 1, characterized in that: The S4 also includes the connection between the conductive glue and the flexible circuit board, wherein the connection of the conductive glue: select a suitable conductive glue, match it according to the material of the battery connection component and the working environment, evenly apply the conductive glue to the connection part, and then fit the battery unit and the connection component together according to the design requirements, and cure it according to the curing requirements of the conductive glue. After the curing is completed, check the firmness and electrical performance of the connection; Connection of the flexible circuit board: Design the circuit layout of the flexible circuit board so that it meets the electrical connection requirements of the battery module body (11), connect the flexible circuit board to the battery tab by welding, and after the connection is completed, check the connection quality of the flexible circuit board, including the conductivity of the circuit, whether there is a short circuit, whether the installation position of the flexible circuit board in the battery module body (11) is correct, and whether it will be squeezed or rubbed.

6. The method for assembling a long and heavy battery module according to claim 1, characterized in that: In S5, the thermal management of the battery module body (11) specifically includes the following steps: S501: Designing the layout of the water cooling pipeline, fitting the water cooling pipeline tightly to the heat generating part of the battery module body (11), installing a water pump in the water cooling pipeline to drive the circulation of the coolant, and configuring a heat exchanger, a temperature sensor and a control system to adjust the flow rate of the water pump and the working state of the heat exchanger according to the temperature of the battery module; S502: The phase change material is encapsulated in a suitable container, and then the container is installed inside the battery module body (11). During the installation process, it is necessary to ensure that the phase change material has good thermal contact with the battery module.

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