The portable device for inspecting the battery

Abstract

The present invention relates to a power-free portable battery inspection device that is easy to move without a cable for connection to an external power source. The power-free portable battery inspection device according to the present invention comprises: a rapid inspection unit that detects whether a battery is degraded by electrochemical impedance spectroscopy; a residual performance evaluation unit that accurately evaluates the remaining performance of a battery by repeating charging and discharging for a battery determined by the rapid inspection unit to require precise inspection; a control unit that controls the operation of the rapid inspection unit and the residual performance evaluation unit, stores data generated during the operation of the rapid inspection unit and the residual performance evaluation unit, and communicates with the outside; and a battery bank unit that supplies AC single-phase power to the rapid inspection unit and the residual performance evaluation unit, and supplies three-phase DC power to the residual performance evaluation unit.

Description

Technology Field

[0001] The present invention relates to a power-free portable battery inspection device, and more specifically, to a power-free portable battery inspection device that is easy to move without a cable for connection to an external power source. Background Technology

[0002] Rechargeable batteries, which are easy to apply across various product categories and possess electrical characteristics such as high energy density, are widely used not only in portable devices but also in electric vehicles (EVs) or hybrid electric vehicles (HEVs) powered by electric sources. Along with the primary advantage of reducing fossil fuel consumption, these rechargeable batteries are currently attracting attention as a new energy source for enhancing eco-friendliness and energy efficiency, particularly because they generate no byproducts from energy usage.

[0003] While the demand for secondary batteries continues to increase, research on waste battery disposal methods is still lacking. In other words, there is no proper management of batteries that are discarded or reprocessed after use.

[0004] Rechargeable batteries, such as lithium-ion batteries, are not only vulnerable to heat and easily ignite, but also contain organic solvents and metal oxides, making it difficult to extinguish fires with fire extinguishers or water. Furthermore, a short circuit in a single battery cell can lead to a chain of explosions, potentially escalating the scale of the accident. Additionally, ensuring safety in the event that a battery cell splits due to external impact is currently difficult. In such cases, explosions could occur in smartphones, substations, and ESS (Energy Storage Systems) at power plants that utilize these rechargeable batteries.

[0005] For the reuse or recycling of such lithium-ion batteries, an accurate condition inspection of the battery is essential. Conventional battery inspection equipment is structured to require three-phase power to be supplied to the power converter, so a cable for connecting the three-phase power is always required.

[0006] In addition, measuring instruments related to battery performance evaluation must also be powered by single-phase power, and if the batteries to be tested are distributed in multiple locations, there is a problem that three-phase power and single-phase 220V power must be prepared at each location. The problem to be solved

[0007] The technical problem to be solved by the present invention is to provide a power-free portable battery inspection device that is easy to move without a cable for connection to an external power source. means of solving the problem

[0008] A power-free portable battery inspection device according to the present invention for solving the aforementioned technical problem comprises: a rapid inspection unit that detects whether the battery is degraded by electrochemical impedance spectroscopy; a residual performance evaluation unit that accurately evaluates the remaining performance of a battery by repeating charging and discharging for a battery determined by the rapid inspection unit to require precise inspection; a control unit that controls the operation of the rapid inspection unit and the residual performance evaluation unit, stores data generated during the operation of the rapid inspection unit and the residual performance evaluation unit, and communicates with the outside; and a battery bank unit that supplies AC single-phase power to the rapid inspection unit and the residual performance evaluation unit, and supplies three-phase DC power to the residual performance evaluation unit.

[0009] In addition, in the present invention, the rapid inspection unit preferably estimates whether the battery is degraded by measuring the internal impedance of the battery to be inspected by applying AC power to the battery to be inspected at different frequencies and then transferring the resulting output to a Nyquist plot for analysis.

[0010] In addition, in the present invention, it is preferable that the residual performance evaluation unit measures the state of charge and state of health of the battery by repeatedly performing the process of charging and discharging the battery to be tested.

[0011] In addition, in the present invention, the battery bank unit preferably comprises: a battery bank having a charging capacity of about 2 to 3 times the capacity of the battery to be tested; a first power supply unit that supplies power charged in the battery bank to the control unit and the rapid test unit through a single-phase inverter; a second power supply unit that supplies power charged in the battery bank to the remaining performance evaluation unit through a bidirectional DCDC converter; and an energy management unit that is installed to be connectable to an external power source and discharges to the outside when the battery bank is overcharged and charges the battery bank when it is overdischarged.

[0012] In addition, the power-free mobile battery inspection device according to the present invention preferably further comprises: a housing that provides a space in which the battery bank unit, the remaining performance evaluation unit, the control unit, and the rapid inspection unit are sequentially stacked and installed; and a caster unit installed at the bottom of the housing and supporting the housing so as to allow rolling movement. Effects of the invention

[0013] The power-free mobile battery inspection device of the present invention has the advantage of being able to rapidly diagnose the deterioration of multiple batteries while moving freely without a power connection, and accurately evaluate the remaining performance of the battery under inspection. Brief explanation of the drawing

[0014] FIG. 1 is a perspective view illustrating the structure of a power-free mobile battery inspection device according to one embodiment of the present invention. Figure 2 is a circuit diagram of the internal impedance equivalent model of a typical battery. Figure 3 is a diagram showing the Nyquist plot measured for the battery. FIG. 4 is a drawing illustrating the configuration of a battery bank section according to an embodiment of the present invention. Specific details for implementing the invention

[0015] Specific embodiments of the present invention will be described in detail below with reference to the attached drawings.

[0016] As shown in FIG. 1, the power-free mobile battery inspection device (100) according to the present embodiment may be configured to include a rapid inspection unit (110), a remaining performance evaluation unit (130), a control unit (120), a battery bank unit (140), a housing (150), and a caster unit (160).

[0017] The above rapid inspection unit (110) is a component that rapidly detects whether the battery is degraded by electrochemical impedance spectroscopy. That is, the above rapid inspection unit (110) does not accurately inspect the aging state of multiple batteries to be inspected, but rather rapidly estimates whether the battery is aging by measuring the impedance inside the battery to be inspected.

[0018] The internal impedance of the battery under test is defined by the internal impedance equivalent model as shown in FIG. 2. Here, R P represents the electrochemical reaction rate within the battery, and C P represents the capacitor function due to the electric double layer between the electrode and the electrolyte within the battery, and Z Wε is the Warburg impedance, which is an impedance related to the diffusion rate of lithium ions in the electrolyte; it is not an impedance due to RLC circuit components, but rather an impedance in the mathematical sense that is inversely proportional to frequency. Therefore, R P and C P It can be used as a standard to indicate the state of charge (SOC) of the battery.

[0019] Specifically, in this embodiment, the rapid inspection unit (110) applies AC power to the battery to be inspected at different frequencies, and then, as shown in FIG. 3, measures the internal impedance of the battery to be inspected by transferring the resulting output to a Nyquist plot for analysis.

[0020] In Figure 3, the green line is a diagram of a new battery in its factory-shipped state, the orange line is a diagram of a battery that has aged slightly, and the red line is a diagram of a battery that has aged significantly.

[0021] In this way, the degree of aging can be estimated through the diagram of the battery under inspection.

[0022] Next, the remaining performance evaluation unit (130) is a component that accurately evaluates the remaining performance of a battery by repeating charging and discharging for a battery determined by the rapid inspection unit (110) to require precise inspection. That is, the remaining performance evaluation unit (130) accurately evaluates the state of charge (SOC) and state of health (SOH) of the target battery based on data values ​​obtained by repeating charging and discharging according to necessary conditions for the target battery.

[0023] Specifically, the above-mentioned remaining performance evaluation unit (130) measures SOH and SOC for a new battery that is in the same factory shipment state as the battery being evaluated, and obtains SOH 100% data. Then, it measures EIS according to temperature while changing the temperature of this new battery to 10℃, 25℃, and 35℃, and also obtains the data.

[0024] Next, the process of bringing the new battery to a state of 90% SOC, measuring EIS according to temperature changes, and acquiring data is carried out by gradually lowering the SOC by 10% at a time.

[0025] Next, the time required to fully charge the battery under evaluation and the time from full charge to full discharge are measured, and the data is compared with that of a new battery to accurately evaluate the SOH and SOC of the battery under evaluation.

[0026] Next, the control unit (120) is a component that controls the operation of the rapid inspection unit (110) and the remaining performance evaluation unit (130), stores data generated during the operation of the rapid inspection unit (110) and the remaining performance evaluation unit (130), and communicates with the outside. That is, the control unit (120) basically controls the rapid inspection unit (110) and the remaining performance evaluation unit (130) to perform necessary functions when necessary, and stores data generated during that process.

[0027] Furthermore, the control unit (120) provides a communication function to enable wireless communication with an external entity, such as a central control room installed separately from the power-free mobile battery inspection device (100). Therefore, remote control of the power-free mobile battery inspection device (100) according to this embodiment is possible through the communication function of the control unit (120). However, since the control unit (120) itself stores all generated data, the burden of data transmission and storage is not placed on the central control room.

[0028] Next, the battery bank unit (140) is a component that supplies AC single-phase power to the rapid inspection unit (110) and the control unit (120), and supplies three-phase DC power to the remaining performance evaluation unit (130). That is, the battery bank unit (140) supplies AC single-phase power to the rapid inspection unit (110) and three-phase DC power to the remaining performance evaluation unit (130) during the inspection process while possessing its own power through external charging. Due to the presence of such a battery bank unit (140), the power-free mobile battery inspection device (100) according to the present embodiment can operate without power without being connected to an external power source or wiring.

[0029] To this end, in this embodiment, the battery bank unit (140) may be configured to include a battery bank (141), a first power supply unit (142), a second power supply unit (143), and an energy management unit (144), as specifically illustrated in FIG. 4.

[0030] First, the above battery bank (141) is a battery having a charging capacity of about 2 to 3 times the capacity of the battery to be tested, and it is desirable to charge about 50 to 60% of the total charging capacity.

[0031] Next, the first power supply unit (142) is a component that supplies power charged in the battery bank (141) to the control unit (120) and the rapid inspection unit (110) through a single-phase inverter. That is, the first power supply unit (142) has a circuit structure as shown in FIG. 4, so that it can perform its overall function without a cable connecting to an external power source by supplying power to the control unit (120) and the rapid inspection unit (110) that require 220V single-phase AC power.

[0032] Next, the second power supply unit (143) is a component that supplies power charged in the battery bank (141) to the remaining performance evaluation unit (130) through a bidirectional DCDC converter. That is, the second power supply unit (143) has a circuit structure as shown in FIG. 4, so that it can perform its function without a cable connecting to an external power source by supplying three-phase DC power to the remaining performance evaluation unit (130) that requires three-phase DC power.

[0033] Next, the energy management unit (144) is installed to be connectable to an external power source and is a component that discharges to the outside when the battery bank (141) is overcharged and charges the battery bank (141) when it is overdischarged. That is, the energy management unit (144) manages the charging energy inside the battery bank (141) so that the battery bank (141) always maintains an appropriate charge state.

[0034] However, the energy management unit (144) is not always connected to an external power source, but normally remains unconnected to an external power source and is connected to an external power source only when necessary to charge or discharge the battery bank (141).

[0035] Next, it is preferable that the power-free mobile battery inspection device (100) according to the present embodiment further includes a housing (150). In the present embodiment, the battery bank unit (140), the remaining performance evaluation unit (130), the control unit (120), and the rapid inspection unit (110) are preferably installed by stacking them sequentially as shown in FIG. 1, and the housing (150) provides a space in which the battery bank unit (140), the remaining performance evaluation unit (130), the control unit (120), and the rapid inspection unit (110) are stacked, installed, and operated.

[0036] Accordingly, the above housing (150) is installed in a multi-stage cabinet structure and is preferably made of a metal material having sufficient strength and hardness.

[0037] Next, as shown in FIG. 1, it is preferable that the power-free mobile battery inspection device (100) according to the present embodiment further be equipped with a caster unit (160). The caster unit (160) is installed at the bottom of the housing (150) and consists of a plurality of casters that support the housing (150) so as to allow rolling movement. Through the caster unit (160), the user can use the power-free mobile battery inspection device (100) according to the present embodiment by moving it to various positions with minimal force. Explanation of the symbols

[0038] 100: Powerless portable battery inspection device according to one embodiment of the present invention 110: Rapid Inspection Unit 120: Control Unit 130: Remaining Performance Evaluation Unit 140: Battery Bank Unit 150 : Housing 160 : Caster part

Claims

Claim 1 A power-free portable battery inspection device according to the present specification.

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