Liquid injection amount adjusting device and battery liquid injection amount correcting device

Abstract

The utility model relates to a liquid injection amount adjusting device and a battery liquid injection amount correcting device. The injection amount adjustment device (100) includes: a servo adjustment mechanism (25); the liquid injection pump (30) is electrically connected with the servo adjusting mechanism (25); a weighing meter (50); an analog input / output module (70); the analog quantity input and output module (70) is used for receiving a liquid injection quantity measurement value from the metering and weighing instrument (50) and converting the measurement value into electric signal information; the PLC control module (80) is configured to receive the electric signal information from the analog input / output module (70) and compare the electric signal information with a set target value to generate a control instruction, and the servo adjustment mechanism (25) is configured to receive the control instruction from the PLC control module (80) and adjust the liquid injection amount of the liquid injection pump (30).

Description

Injection volume adjustment device and battery injection volume compensation device Technical Field

[0001] This utility model relates to a liquid injection volume adjustment device and a battery liquid injection volume correction device. Background Technology

[0002] In the production of lithium-ion rechargeable batteries and other batteries, the electrolyte injection process is a critical step that directly affects battery performance and safety. Excessive electrolyte can lead to gas production and swelling, while insufficient electrolyte affects cycle life. Current electrolyte injection procedures involve a pump continuously injecting electrolyte from an electrolyte tank into the battery. Each injection is a fixed amount, and there are no control elements or detection capabilities for the injection volume. Manual checks and adjustments are performed periodically, but by the time abnormalities are detected, production has already continued for a considerable time, such as an hour. These manual checks and adjustments involve manually weighing the electrolyte and comparing it to the target injection volume, then manually adjusting the pump's volume using a knob. Furthermore, after prolonged operation, the injection volume often becomes unstable, and this situation is not promptly reported. Therefore, when abnormalities occur in the injection volume, a large number of batteries are scrapped. In other words, the control and detection capabilities for single-batch injection volume are insufficient, the injection process is inefficient, and the IR and CPK distributions are poor. It is necessary to improve the injection process steps and work efficiency, increase production capacity, and achieve efficient centralized production to reduce losses caused by manufacturing defects.

[0003] The existing electrolyte injection process and its accuracy need improvement. To meet the demand for efficient production of next-generation high-performance secondary batteries, there is an urgent need for a device that can achieve high-precision quantitative electrolyte injection and automatically adjust and / or correct the injection volume throughout the entire process. Summary of the Invention

[0004] The purpose of this invention is to provide a liquid volume adjustment device and a battery liquid volume correction device that can automatically monitor changes in the liquid volume in real time and make adjustments and corrections in real time, and can achieve high-precision quantitative liquid injection.

[0005] In order to achieve the above-mentioned objectives of this utility model, the inventor of this utility model has conducted in-depth research and derived the following technical solution.

[0006] (1) A liquid injection volume adjustment device, characterized in that it comprises: a servo adjustment mechanism; a liquid injection pump electrically connected to the servo adjustment mechanism; a weighing instrument; an analog input / output module; and a PLC control module.

[0007] The weighing instrument is electrically connected to the analog input / output module, the analog input / output module is electrically connected to the PLC control module, and the PLC control module is electrically connected to the servo adjustment mechanism.

[0008] The injection pump and the weighing instrument are configured such that the injection pump delivers liquid to the weighing instrument through a first infusion pipe.

[0009] The weighing instrument is configured to measure the amount of liquid injected from the injection pump to obtain a measured value.

[0010] The analog input / output module is configured to receive the liquid injection volume measurement value from the weighing instrument and convert the measurement value into electrical signal information.

[0011] The PLC control module is configured to receive electrical signal information from the analog input / output module, compare the electrical signal information with a set target value, and generate control commands.

[0012] The servo adjustment mechanism is configured to receive the control command from the PLC control module and adjust the injection volume of the injection pump.

[0013] (2) The liquid injection volume adjustment device according to (1) above is characterized in that the liquid injection volume adjustment device further includes a liquid tank containing liquid, and the liquid tank is connected to the liquid injection pump through a second liquid delivery pipe.

[0014] (3) The liquid volume adjustment device according to (1) or (2) above, characterized in that the liquid is an acidic liquid, an alkaline liquid or a neutral liquid.

[0015] (4) The liquid volume adjustment device according to (1) or (2) above is characterized in that the weighing instrument is equipped with a liquid containing container.

[0016] (5) A battery electrolyte filling volume correction device, characterized in that it comprises: a battery weighing unit before electrolyte filling; a battery weighing unit after electrolyte filling; an analog input / output module; a PLC control module; a servo adjustment mechanism; and an electrolyte filling pump electrically connected to the servo adjustment mechanism.

[0017] The battery weighing unit before and after electrolyte injection is electrically connected to the analog input / output module, which is electrically connected to the PLC control module. The PLC control module is electrically connected to the servo adjustment mechanism.

[0018] The battery weighing unit before electrolyte injection is configured to: bind battery ID information and measure the battery weight before electrolyte injection.

[0019] The battery weighing unit after electrolyte injection is configured to measure the weight of the battery after electrolyte injection.

[0020] The analog input / output module is configured to: receive the battery weight before liquid injection from the battery weighing unit before liquid injection and the battery weight after liquid injection from the battery weighing unit after liquid injection, calculate the weight difference before and after liquid injection, calculate the arithmetic average of the weight differences before and after liquid injection for each of the multiple batteries to obtain the center deviation, and convert the center deviation into electrical signal information.

[0021] The PLC control module is configured to receive electrical signal information from the analog input / output module, compare the electrical signal information with a set target value, and generate control commands.

[0022] The servo adjustment mechanism is configured to receive the control command from the PLC control module and adjust the injection volume of the injection pump.

[0023] (6) The battery electrolyte volume correction device according to (5) above is characterized in that the battery electrolyte volume correction device further includes an electrolyte tank containing battery electrolyte, and the electrolyte tank is connected to the injection pump through a third delivery pipe.

[0024] (7) The battery electrolyte filling correction device according to (6) above is characterized in that the electrolyte is an acidic electrolyte, an alkaline electrolyte or a neutral electrolyte.

[0025] (8) The battery liquid filling volume correction device according to any one of (5) to (7) above, characterized in that the battery weighing unit before liquid filling has a battery ID reading and binding unit, and the battery weighing unit after liquid filling has a battery weight reading unit.

[0026] (9) The battery liquid volume correction device according to any one of (5) to (7) above, characterized in that the plurality of batteries are 100 batteries.

[0027] (10) The battery liquid volume correction device according to any one of (5) to (7) above, characterized in that the battery is a primary battery or a secondary battery.

[0028] Utility Model Effect

[0029] According to this utility model, a liquid injection volume adjustment device and a battery liquid injection volume correction device can be provided that can automatically monitor changes in the liquid injection volume in real time and make adjustments and corrections in real time, and can achieve high-precision quantitative liquid injection. Attached Figure Description

[0030] Figure 1 is a schematic diagram of an example of the liquid injection volume adjustment device according to Embodiment 1 of this utility model.

[0031] Figure 2 is a schematic diagram of an example of the battery electrolyte filling volume correction device according to Embodiment 2 of this utility model. Detailed Implementation

[0032] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely exemplary and can take many different forms. Furthermore, the accompanying drawings disclosed in this specification are, in principle, only schematic illustrations. That is, the dimension ratios in the drawings may not be consistent with the actual dimension ratios, and the dimension ratios may not be consistent between different drawings.

[0033] (Implementation Method 1)

[0034] Embodiment 1 relates to a liquid injection volume adjustment device, characterized in that it comprises: a servo adjustment mechanism; a liquid injection pump electrically connected to the servo adjustment mechanism; a weighing instrument; an analog input / output module; and a PLC control module.

[0035] The weighing instrument is electrically connected to the analog input / output module, the analog input / output module is electrically connected to the PLC control module, and the PLC control module is electrically connected to the servo adjustment mechanism.

[0036] The injection pump and the weighing instrument are configured such that the injection pump delivers liquid to the weighing instrument through a first infusion pipe.

[0037] The weighing instrument is configured to measure the amount of liquid injected from the injection pump to obtain a measured value.

[0038] The analog input / output module is configured to receive the liquid injection volume measurement value from the weighing instrument and convert the measurement value into electrical signal information.

[0039] The PLC control module is configured to receive electrical signal information from the analog input / output module, compare the electrical signal information with a set target value, and generate control commands.

[0040] The servo adjustment mechanism is configured to receive the control command from the PLC control module and adjust the injection volume of the injection pump.

[0041] Preferably, the liquid injection volume adjustment device of this embodiment further includes a liquid tank containing liquid, and the liquid tank is connected to the injection pump through a second infusion pipe, so that the liquid in the liquid tank can be delivered to the injection pump.

[0042] The liquid injection volume adjustment device of this embodiment can be used in the injection process of various liquid media. The liquid can be a solvent, solution, etc., and can be an acidic, alkaline, or neutral liquid, such as a battery electrolyte. The battery electrolyte varies depending on the type of battery and can be an acidic, alkaline, or neutral electrolyte, or a non-aqueous electrolyte. The battery can be a primary battery or a secondary battery. Furthermore, the battery can be a cylindrical battery, a prismatic battery, or a battery of other shapes. The secondary battery is preferably a lithium-ion secondary battery or a nickel-metal hydride secondary battery.

[0043] In the liquid injection volume adjustment device of this embodiment, the PLC control module is a module with centralized control data processing capability, and the weighing instrument is used to weigh and collect liquid injection volume data. However, the PLC control module cannot directly recognize the liquid injection volume data. Therefore, an analog input / output module needs to be added between the weighing instrument and the PLC control module. This analog input / output module receives the liquid injection volume data from the weighing instrument and converts the liquid injection volume data into electrical signal information that can be recognized by the PLC control module. Then, it outputs the electrical signal information to the PLC control module, thereby completing an information transmission process.

[0044] The weighing instrument is electrically connected to the analog input / output module via a wiring harness. The analog input / output module is electrically connected to the PLC control module via a wiring harness. The PLC control module is electrically connected to the servo adjustment mechanism via a wiring harness. The servo adjustment mechanism is electrically connected to the injection pump via a wiring harness.

[0045] There are no particular restrictions on the installation location of the servo adjustment mechanism and the injection pump; the installation location can be selected according to the actual process requirements. The servo adjustment mechanism and the injection pump can be installed together in one equipment cabinet or separately in different equipment cabinets.

[0046] The installation location of the analog input / output module and the PLC control module can be selected according to the actual process requirements. For example, they can be installed together in one equipment cabinet or separately in different equipment cabinets.

[0047] The servo adjustment mechanism can have a servo motor and a driver. In this case, after the PLC control module generates control commands, it sends them to the driver of the servo adjustment mechanism and then to the servo motor, which adjusts the injection volume of the injection pump.

[0048] The weighing instrument has a liquid containment container for receiving liquid from the injection pump. The weighing instrument is typically a weighing balance.

[0049] The electrolyte injection volume adjustment device of this embodiment can be used in the electrolyte injection process of a battery. In this case, the injection volume of the injection pump is the amount of electrolyte injected into the battery, and the set target value corresponds to the electrical signal information of the set electrolyte volume for the battery. The set target value is a standard value specified according to the type and specifications of the battery. The servo adjustment mechanism adjusts the injection volume of the injection pump based on feedback of the difference between the amount of electrolyte injected into the battery by the injection pump (hereinafter sometimes simply referred to as the "battery injection volume") and the set target value of the set electrolyte volume for the battery.

[0050] According to the liquid injection volume adjustment device of this embodiment, the liquid injection volume of the battery can be precisely adjusted based on the standard value specified by the battery type and specification requirements, and the liquid injection volume can be automatically monitored and adjusted in real time.

[0051] Figure 1 is a schematic diagram of an example of the injection volume adjustment device of Embodiment 1.

[0052] As shown in Figure 1, in the liquid volume adjustment device 100, the liquid tank 10 and the liquid injection pump 30 are connected through the second liquid delivery pipe 20, and the liquid injection pump 30 delivers liquid to the liquid receiving container 60 of the measuring balance 50 through the first liquid delivery pipe 40.

[0053] The measuring balance 50 weighs and measures the amount of liquid delivered from the injection pump 30 to the liquid container 60 in a single injection. The measured value of the injection volume is input to the analog input / output module 70, which converts it into an electrical signal and transmits it to the PLC control module 80. The PLC control module 80 compares the electrical signal with the set target value, generates a control command, and sends it to the servo adjustment mechanism 25. The servo adjustment mechanism 25 then adjusts the injection volume of the injection pump 30.

[0054] (Implementation Method 2)

[0055] Embodiment 2 relates to a battery electrolyte filling volume correction device, characterized in that it comprises: a battery weighing unit before electrolyte filling; a battery weighing unit after electrolyte filling; an analog input / output module; a PLC control module; a servo adjustment mechanism; and an electrolyte filling pump electrically connected to the servo adjustment mechanism.

[0056] The battery weighing unit before and after electrolyte injection is electrically connected to the analog input / output module, which is electrically connected to the PLC control module. The PLC control module is electrically connected to the servo adjustment mechanism.

[0057] The battery weighing unit before electrolyte injection is configured to: bind battery ID information and measure the battery weight before electrolyte injection.

[0058] The battery weighing unit after electrolyte injection is configured to measure the weight of the battery after electrolyte injection.

[0059] The analog input / output module is configured to: receive the battery weight before liquid injection from the battery weighing unit before liquid injection and the battery weight after liquid injection from the battery weighing unit after liquid injection, calculate the weight difference before and after liquid injection, calculate the arithmetic average of the weight differences before and after liquid injection for each of the multiple batteries to obtain the center deviation, and convert the center deviation into electrical signal information.

[0060] The PLC control module is configured to receive electrical signal information from the analog input / output module, compare the electrical signal information with a set target value, and generate control commands.

[0061] The servo adjustment mechanism is configured to receive the control command from the PLC control module and adjust the injection volume of the injection pump.

[0062] The battery electrolyte filling correction device also includes an electrolyte tank containing battery electrolyte. The electrolyte tank is connected to the filling pump via a third inlet pipe, and the filling pump fills the battery with electrolyte via a fourth inlet pipe.

[0063] The electrolyte used in batteries varies depending on the type of battery. It can be an acidic electrolyte, an alkaline electrolyte, or a neutral electrolyte, or it can be a non-aqueous electrolyte.

[0064] The battery can be a primary battery or a secondary battery. Furthermore, the battery can be cylindrical, prismatic, or other shapes. The secondary battery is preferably a lithium-ion secondary battery or a nickel-metal hydride secondary battery.

[0065] The center deviation is calculated by continuously averaging the weight differences of multiple batteries, such as 100 batteries, before and after electrolyte injection.

[0066] The pre-filling battery weighing unit measures the weight of the battery before filling, and includes a weighing instrument (e.g., an electronic balance). The post-filling battery weighing unit measures the weight of the battery after filling, and includes a weighing instrument (e.g., an electronic balance).

[0067] The pre-filling battery weighing unit includes a battery ID reading and binding unit for reading and binding battery ID information. This unit reads the battery ID and transmits it to the analog input / output module, converting it into an electrical signal and transmitting it to the PLC control module. Simultaneously, it synchronously transmits the weight information of the same battery after weighing by the weighing unit to the analog input / output module, converting it into an electrical signal and transmitting it to the same address within the PLC control module to achieve battery ID weight binding. The battery ID refers to battery identification information, i.e., information used to distinguish batteries. The post-filling battery weighing unit includes a battery weight reading unit. This unit reads the weight of the battery after filling and transmits it to the analog input / output module, converting it into an electrical signal and transmitting it to the PLC control module. The PLC control module compares the post-filling battery weight data with the battery ID weight bound to the PLC control module to calculate the weight difference before and after filling. Furthermore, it performs an arithmetic mean calculation on the weight differences of multiple batteries before and after filling to obtain the arithmetic mean and center deviation, and compares this center deviation with a set target value. If the center deviation exceeds the set target value, the PLC control module generates a control command, which is then transmitted to the servo adjustment mechanism. The servo adjustment mechanism adjusts the electrolyte injection volume of the injection pump based on the control command from the PLC control module. The set target value corresponds to the electrical signal information for the set electrolyte volume of the battery. The set target value is a standard value specified according to the type and specifications of the battery. The injection volume and the set target value vary depending on the battery specifications and type (cylindrical, prismatic, pouch) and the electrolyte formulation (high / low viscosity), and must be selected while ensuring battery performance and safety.

[0068] Figure 2 is a schematic diagram of an example of the battery electrolyte filling volume correction device of Embodiment 2.

[0069] As shown in Figure 2, in the battery electrolyte filling correction device 200, the battery weight data M1 of battery 99 before electrolyte filling is read by the battery ID reading and binding unit 85 of the pre-filling battery weighing unit 80 and bound to the PLC control module 80 via the analog input / output module 70. The battery weight data M2 of battery 99 after the electrolyte filling process is read by the battery weight reading unit 95 of the post-filling battery weighing unit 90 and transmitted to the PLC control module 80 via the analog input / output module 70. The PLC control module 80 calculates the weight difference of the battery before and after electrolyte filling. The PLC control module 80 performs an arithmetic mean calculation on the weight difference of each of the 100 batteries before and after electrolyte filling to obtain the arithmetic mean and the center deviation. The PLC control module 80 compares the center deviation with the set target value to generate a control command, and then transmits the control command to the servo adjustment mechanism 25. The servo adjustment mechanism 25 receives the control command from the PLC control module and adjusts the amount of electrolyte injected into the battery 99 by the electrolyte pump 30. Meanwhile, the adjusted liquid injection volume is weighed and confirmed at the liquid containment monitoring station. The injection pump 30 injects liquid into the battery 99 through the first infusion tube 40. The two arrows shown in Figure 2, from the battery weight data M1 before injection to the battery weight data M2 after the injection process, schematically indicate the direction of the battery manufacturing process from before to after injection.

[0070] On the battery production line, the electrolyte injection volume is usually adjusted by continuously monitoring every 100 cells and taking into account the arithmetic mean and center deviation of the electrolyte injection volume of the 100 cells as described above.

[0071] The battery ID reading and binding unit reads the battery weight t1 before electrolyte filling, and the battery weight reading unit reads the battery weight t2 after electrolyte filling and calculates the actual electrolyte filling amount t2-t1=Δt. Based on the battery model and specifications, there are corresponding specified range requirements for the electrolyte filling amount. The electrolyte filling amount of 100 batteries is collected to calculate the arithmetic mean and center deviation, and this center deviation is compared with the set target value. If the difference is within the specified range, no adjustment of the electrolyte filling amount is needed; if the difference exceeds the specified range, the difference information is transmitted to the servo adjustment mechanism, which adjusts the electrolyte filling amount of the filling pump according to the difference.

[0072] According to the battery liquid injection volume correction device of this embodiment, real-time feedback on single liquid injection volume adjustment can be provided by adding a liquid containment monitoring station; by adding a weighing station in the battery liquid injection process to bind the data with the battery ID, the PLC control module analyzes the data to adjust the liquid injection volume and form a data closed loop; and by connecting the liquid injection volume adjustment knob of the injection pump to the servo adjustment mechanism, the automatic program adjustment function is realized.

[0073] The battery electrolyte filling volume correction device of this embodiment can achieve the following functions:

[0074] 1. The single injection volume adjustment of the injection pump can be servo-controlled in real time and can be imported into the production line to correct the injection volume of the injection pump in real time, ensuring that the center value distribution deviation of the injection volume is within ±0.05g (injection volume accuracy <0.05g).

[0075] 2. The CPK process capability of the injection volume distribution is >3.7. It should be noted that CPK (process capability index) measures the ability of a process to meet specifications under stable and controlled conditions. When CPK ≥ 1.33, the process capability is considered sufficient. Therefore, "the CPK process capability of the injection volume distribution >3.7" means that the injection volume distribution is well-controlled and uniform.

[0076] 3. The proportion of cases with poor electrolyte filling and poor battery internal resistance (IR) in the total production quantity has been reduced to below 0.1%.

[0077] In the battery production system, the liquid injection volume adjustment device described in Embodiment 1 and / or the liquid injection volume correction device described in Embodiment 2 can be used. The liquid injection volume correction device described in Embodiment 2 can be used to confirm and correct the actual liquid injection volume of the battery, and the liquid injection volume adjustment device described in Embodiment 1 can be used to precisely adjust the liquid injection volume of the battery according to specifications.

[0078] Other advantages and improvements of this invention will be readily apparent to those skilled in the art, and therefore the scope of this invention is not limited to the typical embodiments and specific details described above. Thus, various changes and modifications can be made to this invention without departing from the spirit or scope of the general inventive concept as defined by the claims.

[0079] Industrial availability

[0080] According to this utility model, a liquid injection volume adjustment device and a battery liquid injection volume correction device can be provided that can automatically monitor changes in the liquid injection volume in real time and make adjustments and corrections in real time, and can achieve high-precision quantitative liquid injection.

Claims

1. A liquid injection volume adjustment device, characterized in that, It includes: a servo adjustment mechanism; a liquid injection pump electrically connected to the servo adjustment mechanism; a weighing instrument; an analog input / output module; and a PLC control module, wherein the weighing instrument is electrically connected to the analog input / output module, the analog input / output module is electrically connected to the PLC control module, the PLC control module is electrically connected to the servo adjustment mechanism, the liquid injection pump and the weighing instrument are configured such that: the liquid injection pump delivers liquid to the weighing instrument through a first infusion tube; the weighing instrument is configured to: measure the liquid injection volume from the liquid injection pump to obtain a measured value; the analog input / output module is configured to: receive the liquid injection volume measured value from the weighing instrument and convert the measured value into electrical signal information; the PLC control module is configured to: receive the electrical signal information from the analog input / output module and compare the electrical signal information with a set target value to generate a control command; and the servo adjustment mechanism is configured to: receive the control command from the PLC control module and adjust the liquid injection volume of the liquid injection pump.

2. The injection volume adjustment device according to claim 1, characterized in that, The liquid injection volume adjustment device also includes a liquid tank containing liquid, and the liquid tank is connected to the injection pump through a second infusion pipe.

3. The injection volume adjustment device according to claim 1 or 2, characterized in that, The liquid is an acidic liquid, an alkaline liquid, or a neutral liquid.

4. The injection volume adjustment device according to claim 1 or 2, characterized in that, The weighing instrument is equipped with a liquid containment container.

5. A battery electrolyte level correction device, characterized in that, It includes: a battery weighing unit before electrolyte injection; a battery weighing unit after electrolyte injection; an analog input / output module; a PLC control module; a servo adjustment mechanism; and an injection pump electrically connected to the servo adjustment mechanism. The battery weighing unit before and after electrolyte injection are respectively electrically connected to the analog input / output module, which is electrically connected to the PLC control module. The PLC control module is electrically connected to the servo adjustment mechanism. The battery weighing unit before electrolyte injection is configured to bind battery ID information and measure the battery weight before electrolyte injection. The battery weighing unit after electrolyte injection is configured to measure the battery weight after electrolyte injection. The analog input / output module is configured to... The PLC control module receives the battery weight before injection from the pre-injection battery weighing unit and the battery weight after injection from the post-injection battery weighing unit, calculates the weight difference between the batteries before and after injection, calculates the arithmetic average of the weight differences of multiple batteries before and after injection to obtain the center deviation, and converts the center deviation into electrical signal information. The PLC control module is configured to receive the electrical signal information from the analog input / output module and compare the electrical signal information with a set target value to generate a control command. The servo adjustment mechanism is configured to receive the control command from the PLC control module and adjust the injection volume of the injection pump.

6. The battery electrolyte filling volume correction device according to claim 5, characterized in that, The battery electrolyte filling correction device also includes an electrolyte tank containing battery electrolyte, which is connected to the filling pump via a third delivery pipe.

7. The battery electrolyte filling volume correction device according to claim 6, characterized in that, The electrolyte is an acidic electrolyte, an alkaline electrolyte, or a neutral electrolyte.

8. The battery electrolyte filling volume correction device according to any one of claims 5 to 7, characterized in that, The battery weighing unit before liquid injection has a battery ID reading and binding unit, and the battery weighing unit after liquid injection has a battery weight reading unit.

9. The battery electrolyte filling volume correction device according to any one of claims 5 to 7, characterized in that, The plurality of batteries is 100 batteries.

10. The battery electrolyte filling volume correction device according to any one of claims 5 to 7, characterized in that, The battery can be a primary battery or a secondary battery.

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