A power swap lithium battery charging and discharging detection device and method

Abstract

The application relates to the technical field of lithium battery charging, in particular to a charging and discharging detection device and method for power battery replacement lithium batteries, which comprises a rack, a test power supply placing box, a distribution box, an operation panel and a test needle bed; when the lithium battery is charged by the test needle bed, the surrounding cooling assembly around the test needle bed is used; after the upper needle bed and the lower needle bed of the test needle bed are folded, the surrounding air bags in the surrounding cooling assembly are synchronously extruded, the surrounding air bags spray cooling gas, a cooling air flow is formed around the lithium battery, the lithium battery maintains good stability during the charging and discharging test process, and the application also provides a method for charging and detecting the lithium battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery charging, in particular to a charging and discharging detection device and method for power battery swapping lithium battery. BACKGROUND

[0002] "Lithium battery" is a kind of battery using non-aqueous electrolyte solution with lithium metal or lithium alloy as positive / negative electrode material. In 1912, Gilbert N. Lewis first proposed and studied lithium metal battery. In the 1970s, M.S. Whittingham proposed and began to study lithium-ion battery. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high requirements on the environment. With the development of science and technology, lithium battery has become the mainstream.

[0003] Lithium battery is widely used in energy storage power supply systems such as hydraulic, thermal, wind and solar power stations, uninterrupted power supply of postal and telecommunication, electric tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, aerospace, etc. Lithium battery is used as power battery in automobile industry as the main power source of electric vehicles to improve the environmental performance of modern vehicles.

[0004] New energy vehicles mainly consist of battery drive system, motor system, electric control system and assembly, etc. Lithium battery pack is the main component of battery drive system. Lithium battery pack is composed of multiple lithium batteries in series. Although the entire battery pack is charged and discharged during the use of lithium battery pack, the state of each lithium battery plays an important role in lithium battery pack.

[0005] If the battery capacity of one lithium battery in the lithium battery pack of new energy vehicle deteriorates, after multiple charging / discharging cycles, the charge state of the lithium battery will gradually deviate from other batteries, causing power imbalance of the entire lithium battery pack and affecting the working state of the lithium battery pack. However, the existing new energy vehicles can detect the capacity of single lithium battery in the lithium battery pack, but cannot timely and effectively find the fault of the lithium battery pack, reduce the service life of the lithium battery pack and increase the maintenance cost.

[0006] In the Chinese patent with patent application number CN202110347289.4, a lithium battery detector and its detection system are disclosed, which belong to the field of lithium batteries. The lithium battery detector and its detection system include a lithium battery pack installed in a lithium battery protection shell. A lithium battery capacity detector is slidably connected to the left end of the lithium battery protection shell. The lithium battery capacity detector and a lithium battery wire harness plug block can be matched to detect the lithium battery pack in a new energy vehicle in real time. The capacity of the single lithium battery in the lithium battery pack can be effectively monitored. The failure of the lithium battery pack caused by the failure of a single or several single lithium batteries can be effectively avoided. The state of the lithium battery pack can be effectively controlled to improve the service life of the lithium battery pack, reduce maintenance costs, and assist the driver in judging and eliminating the causes and sources of the failure of the new energy vehicle. The driver can effectively maintain and maintain the lithium battery pack, and the practicality of the lithium battery capacity detector is increased.

[0007] However, the above-mentioned lithium battery detector and detection system cannot be used for charging current detection of lithium batteries. SUMMARY

[0008] To solve the above problems, the present application provides a power battery swap lithium battery charging and discharging detection device and method. When the test needle bed charges the lithium battery, the surrounding cooling assembly around the test needle bed is squeezed synchronously after the upper needle bed and the lower needle bed of the test needle bed are folded, so that the surrounding air bag in the surrounding cooling assembly sprays cooling gas to form a cooling gas flow around the lithium battery. The lithium battery maintains good stability during the charging and discharging test process. The present application also provides a method for detecting the charging of the lithium battery.

[0009] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0010] A power battery swap lithium battery charging and discharging detection device, comprising:

[0011] A rack, a test power supply placement box, a distribution box, an operation panel and a test needle bed;

[0012] The test power supply placement box, the distribution box, the operation panel and the test needle bed are all arranged on the rack. The test power supply placement box, the distribution box and the test needle bed are arranged in sequence along the horizontal direction. The test power supply placement box and the distribution box are respectively connected with the test needle bed. The operation panel is used to control the test needle bed.

[0013] The test needle bed comprises an upper heat dissipation fan, an upper needle bed, a battery fixing box, a lower needle bed and a lower heat dissipation fan arranged in sequence from top to bottom. The upper needle bed and the lower needle bed are movably opened and closed. The battery fixing box is used to position and install the lithium battery.

[0014] The four periphery of the test needle bed is provided with a surrounding cooling assembly, which comprises a surrounding air bag and a connecting plate. The surrounding air bag is arranged in a concave shape, and the opening side is used for loading the lithium battery on the test needle bed. The upper and lower ends of the surrounding air bag are connected with the upper needle bed or the lower needle bed through the connecting plate.

[0015] During the opening and closing movement of the upper needle bed and the lower needle bed, the surrounding air bag is driven to expand and compress, so that the surrounding air bag sprays cooling air flow around the lithium battery to take away heat.

[0016] As an improvement, the surrounding air bag is arranged in layers, and the surrounding air bag comprises a plurality of layered air bags from top to bottom. The layered air bags are divided into a plurality of air bag cells, and each air bag cell sprays cooling gas from the air jet hole along the inclined arrangement direction.

[0017] As an improvement, the inclined arrangement directions of the air bag cells of the layered air bags of the two adjacent layers are staggered.

[0018] As an improvement, the jet part of each layer of the layered air bag is inwardly recessed and arranged in a ring-shaped cooling air jet flow channel.

[0019] As an improvement, the upper needle bed is driven to move up and down by a corresponding first air cylinder, and the lower needle bed is driven to move up and down by a corresponding second air cylinder.

[0020] In addition, the application also provides a detection method of the power battery charging and discharging detection equipment based on any one of the above-mentioned power battery charging and discharging detection equipment.

[0021] Step a, loading, placing the lithium battery on the corresponding test needle bed. At this time, the test needle bed does not charge the lithium battery and does not discharge.

[0022] Step b, sampling, the circuit board component in the test power placement box collects current and voltage data information of the lithium battery on the test needle bed through the battery channel;

[0023] Step c, voltage inspection, using the power supply in the test power placement box for power supply, sampling in order from small to large according to the lithium battery station on the test needle bed, registering the station whose voltage is greater than the upper limit voltage or less than the lower limit voltage, and counting and displaying the number of registered stations;

[0024] Step d, constant voltage inspection, taking down the lithium battery on the test needle bed, inspecting the voltage, registering the station whose voltage is greater than the upper limit voltage UU+constant voltage tolerance or less than the upper limit voltage UU-constant voltage tolerance, counting and displaying the number of registered stations, and then reloading the lithium battery.

[0025] Step e, leakage inspection, register the work station with sampling current greater than the set leakage current, count and display the number of registered work stations;

[0026] Step f, charging inspection, send the charging current with current value less than one percent of the current maximum value and the set upper limit voltage, inspect the battery, register the work station with current less than 0.5 times the charging current or greater than 1.5 times the charging current, count and display the number of registered work stations;

[0027] Step g, discharging inspection, send the discharging current with current value less than one percent of the current maximum value, inspect the battery, register the work station with current less than 0.5 times the discharging current or greater than 1.5 times the discharging current, count and display the number of registered work stations;

[0028] Step h, charging, input the charging time, start running, first sample the open circuit voltage of the battery, after inspection, send the upper limit voltage and the charging current signal at the same time, the lithium battery enters the charging state and starts timing;

[0029] Step i, standby, the system does not charge or discharge the lithium battery during standby, but samples and detects;

[0030] Step j, discharging, input the discharging time, first sample the open circuit voltage of the battery, after inspection, send the discharging current signal, the lithium battery enters the discharging state and starts timing;

[0031] Step k, capacity grading, repeat step h, after the lithium battery is fully charged, perform real-time time, capacity and power grading on the lithium battery on the test needle bed.

[0032] As an improvement, in the upper loading step, individual lithium batteries are not correctly installed, which are registered during the running process, the lithium battery is reinstalled, and the next time the lithium battery is inspected at the work station, it can be automatically de-registered, the lithium battery works normally, and the system does not need to be restarted.

[0033] As an improvement, during the detection process, every two minutes, the test needle bed is short-circuit detected, if the lithium battery is short-circuited, the test needle bed clamps the lithium battery shell or the clamp is short-circuited, the lithium battery is registered, and then every time the lithium battery is sampled, it is detected, if the fault is not eliminated, the LED lamp corresponding to the test needle bed is briefly extinguished and then lit.

[0034] As an improvement, in the charging step, when constant current charging is performed, the sampling voltage is greater than or equal to the upper limit voltage, or the lithium battery voltage does not reach the upper limit voltage and decreases, when the decrease is greater than -ΔV, the lithium battery is registered.

[0035] As an improvement, in the discharging step, during discharging, when the lithium battery voltage is less than the lower limit voltage, the lithium battery is immediately registered, and the open circuit voltage of the lithium battery is sampled once, if the open circuit voltage is greater than the sum of the calibration voltage + the lower limit voltage, the lithium battery is immediately unregistered, the lithium battery continues to run, and the voltage sampling voltage value before calibration is calibrated, otherwise the lithium battery is registered.

[0036] The present application has the advantages of:

[0037] (1) When the test needle bed charges the lithium battery, the surrounding cooling assembly around the test needle bed is squeezed synchronously after the upper needle bed and the lower needle bed of the test needle bed are folded, so that the surrounding air bag in the surrounding cooling assembly sprays cooling gas to form a cooling gas flow around the lithium battery, so that the lithium battery maintains good stability during charging and discharging test;

[0038] (2) When the surrounding air bag is arranged, the surrounding air bag is arranged in layers, and the cooling gas of each layer of surrounding air bag is sprayed separately, and the cooling gas is sprayed obliquely to flow in the specified direction in the air jet flow channel, so that the cooling gas flows in the specified direction, and the cooling effect of the lithium battery is better;

[0039] (3) When the surrounding air bag is arranged, the cooling gas flow sprayed by the adjacent upper and lower layers of the surrounding air bag is arranged in a staggered manner, so that the staggered cooling gas flow flows reversely from both sides respectively, further ensuring the balance of the cooling of each part of the lithium battery;

[0040] (4) Before the lithium battery is detected by the charging and discharging detection method, the voltage inspection, constant voltage inspection, leakage inspection, charging inspection and discharging inspection are carried out in turn, so as to exclude all lithium batteries that do not meet the charging and discharging detection, so that the charging and discharging detection of the lithium battery that can normally perform the charging and discharging detection is more accurate, and the interference of adverse factors is reduced as much as possible.

[0041] In summary, the present application has the advantages of good cooling effect, constant temperature of lithium battery, accurate charging and discharging detection result and the like during detection, and is especially suitable for the technical field of lithium battery charging and discharging detection. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 It is a front view structural schematic diagram of the charging and discharging detection equipment of the present application;

[0043] Figure 2 It is a side view structural schematic diagram of the charging and discharging detection equipment of the present application;

[0044] Figure 3 It is a three-dimensional structural schematic diagram of the test needle bed of the present application;

[0045] Figure 4It is the battery fixed box three-dimensional structure schematic view of the present application;

[0046] Figure 5 It is the battery fixed box three-dimensional structure schematic view of the present application; Figure 4 It is the structure enlarged schematic view of A in the middle;

[0047] Figure 6 It is the upper needle bed three-dimensional structure schematic view of the present application;

[0048] Figure 7 It is the lower needle bed three-dimensional structure schematic view of the present application;

[0049] Figure 8 It is the surrounding cooling assembly front view structure schematic view of the present application;

[0050] Figure 9 It is the surrounding cooling assembly three-dimensional structure schematic view of the present application;

[0051] Figure 10 It is the surrounding cooling assembly three-dimensional structure schematic view of the present application; Figure 9 It is the structure enlarged schematic view of B in the middle;

[0052] Figure 11 It is the surrounding air bag sectional view structure schematic view of the present application;

[0053] Figure 12 It is the surrounding air bag sectional view structure schematic view of the present application; Figure 11 It is the structure enlarged schematic view of C in the middle;

[0054] Figure 13 It is the detection method flow chart schematic view of the second embodiment of the present application. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0056] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0057] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an ordered ranking of the indicated technical features. Thus, features defined with "first", "second" or "third" can explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly specified otherwise.

[0058] Embodiment 1:

[0059] As shown in the figure, a power swap lithium battery charge and discharge detection device comprises: Figures 1 to 12

[0060] A rack 1, a test power placement box 2, a distribution box 3, an operation panel 4 and a test needle bed 5;

[0061] The test power placement box 2, the distribution box 3, the operation panel 4 and the test needle bed 5 are all arranged on the rack 1, the test power placement box 2, the distribution box 3 and the test needle bed 5 are arranged in sequence along the horizontal direction, the test power placement box 2 and the distribution box 3 are respectively connected with the test needle bed 5, and the operation panel 4 is used for controlling the test needle bed 5;

[0062] The test needle bed 5 comprises an upper heat dissipation fan 51, an upper needle bed 52, a battery fixing box 53, a lower needle bed 54 and a lower heat dissipation fan 55 arranged in sequence from top to bottom, the upper needle bed 52 and the lower needle bed 54 are movably opened and closed, and the battery fixing box 53 is used for positioning and installing a lithium battery;

[0063] A surrounding cooling assembly 6 is arranged around the test needle bed 5, the surrounding cooling assembly 6 comprises a surrounding air bag 61 and a connecting plate 62, the surrounding air bag 61 is arranged in a concave shape, one side of the opening of the surrounding air bag 61 is used for loading the lithium battery onto the test needle bed 5, and the upper and lower ends of the surrounding air bag 61 are respectively connected with the upper needle bed 52 or the lower needle bed 54 through the connecting plate 62;

[0064] During the opening and closing movement of the upper needle bed 52 and the lower needle bed 54, the surrounding air bag 61 is driven to expand and compress, so that the surrounding air bag 61 sprays cooling air flow around the lithium battery to take away heat.

[0065] The surrounding air bag 61 is arranged in layers, the surrounding air bag 61 comprises a plurality of layered air bags 611 arranged in sequence from top to bottom, the layered air bags 611 are divided into a plurality of air bag cells 6111, the air bag cells 6111 are arranged in an inclined manner, and each air bag cell 6111 sprays cooling gas from a jet hole sss6112 along the inclined arrangement direction.

[0066] Further, the inclined arrangement directions of the air bag cells 6111 of the layered air bags 611 of two adjacent layers above and below are arranged in a staggered manner.​

[0067] Further, the jet part of the layered air bag 611 of each layer is inwardly recessed and arranged in a ring-shaped cooling jet flow channel 612.

[0068] In addition, the upper needle bed 52 is driven to move up and down by a corresponding first air cylinder 521, and the lower needle bed 54 is driven to move up and down by a corresponding second air cylinder 531.

[0069] It needs to be specifically pointed out that the test power placement box 2 is provided with a plurality of circuit board components, the circuit board components include a driving plate, a plurality of driving assemblies are arranged on the driving plate; the driving plate is provided with a control instruction generation circuit and a processing circuit, the driving assembly is provided with a charge and discharge control circuit, a data information acquisition circuit and a data information sending circuit, and the charge and discharge control circuit is arranged in one-to-one correspondence with the battery channel on the test needle bed 5; wherein, the control instruction generation circuit is electrically connected with the charge and discharge control circuit, the data information acquisition circuit is electrically connected with the battery capacity distribution circuit in the motion cabinet, and the data information acquisition circuit is electrically connected with the processing circuit through the data information sending circuit.

[0070] It needs to be specifically pointed out that the test power placement box 2 is provided with a plurality of circuit board components, the circuit board components include a driving plate, a plurality of driving assemblies are arranged on the driving plate; the driving plate is provided with a control instruction generation circuit and a processing circuit, the driving assembly is provided with a charge and discharge control circuit, a data information acquisition circuit and a data information sending circuit, and the charge and discharge control circuit is arranged in one-to-one correspondence with the battery channel on the test needle bed 5; wherein, the control instruction generation circuit is electrically connected with the charge and discharge control circuit, the data information acquisition circuit is electrically connected with the battery capacity distribution circuit in the motion cabinet, and the data information acquisition circuit is electrically connected with the processing circuit through the data information sending circuit.

[0071] The upper needle bed 52 includes a positive probe strip assembly, which is provided with a temperature probe, and a temperature probe is used to detect the surface temperature of the battery cover plate of a single-point battery; the needle bed is connected with the power and sampling cable in a quick plug connection mode, and the position accuracy of the probe pressing can be ensured by manually fine-tuning the positive probe assembly fixing; the needle head can adopt a knife switch type, and the sampling probe adopts beryllium copper.

[0072] Correspondingly, the lower needle bed 54 includes a negative probe strip assembly.

[0073] Embodiment 2:

[0074] As shown in Figure 13 The detection method of the power battery charge and discharge detection equipment of the embodiment two of the application is described in combination with the embodiment one, and includes the following steps:

[0075] Step a, loading, the lithium battery is placed on the corresponding test needle bed 5, at this time, the test needle bed 5 does not charge the lithium battery, nor discharge, before loading, the upper needle bed 52 and the lower needle bed 54 of the test needle bed 5 are in an open state, after the lithium battery is loaded on the battery fixing box 53, the upper needle bed 52 and the lower needle bed 54 are driven to close by the first air cylinder 521 and the second air cylinder 541 respectively;

[0076] Step b, sampling, the circuit board component in the test power placement box 2 collects current, voltage data information of the lithium battery on the test needle bed 5 through the battery channel;

[0077] Step c, voltage inspection, power supply is supplied by the power supply in the test power placement box 2, sampling once (abbreviation: inspection) in the order of the lithium battery station on the test needle bed 5 from small to large, the station whose voltage is greater than the upper limit voltage or less than the lower limit voltage is registered, the number of registered stations is counted and displayed, wherein the upper limit voltage is less than the maximum voltage value, the lower limit voltage is less than the upper limit voltage, and the maximum voltage value is the maximum voltage value of the detection equipment, as for registration, the lithium battery on the station is neither charged nor discharged, the LED lamp of the corresponding station is on, that is, the lithium battery of the station does not participate in the detection work of charging and discharging;

[0078] Step d, constant voltage inspection, the lithium battery on the test needle bed 5 is taken down, the voltage is inspected, the station whose voltage is greater than the upper limit voltage UU+ constant voltage tolerance or less than the upper limit voltage UU- constant voltage tolerance is registered, the number of registered stations is counted and displayed, and then the lithium battery is reloaded, the constant voltage tolerance: the first stage of constant voltage charging is charged with constant current; when the voltage reaches the predetermined value, the second stage is entered for constant voltage charging, at this time the current gradually decreases; when the charging current drops to the set requirement (generally 0.02C), the battery is fully charged;

[0079] Step e, leakage inspection, the station whose sampling current is greater than the set leakage current is registered, and the number of registered stations is counted and displayed;

[0080] Step f, charging inspection, the charging current whose current value is less than one percent of the current maximum value and the set upper limit voltage are sent, the battery is inspected, the station whose current is less than 0.5 times the charging current or greater than 1.5 times the charging current is registered, and the number of registered stations is counted and displayed;

[0081] Step g, discharging inspection, the discharging current whose current value is less than one percent of the current maximum value is sent, the battery is inspected, the station whose current is less than 0.5 times the discharging current or greater than 1.5 times the discharging current is registered, and the number of registered stations is counted and displayed;

[0082] Step h, charging, input charging time, start running, first sample the open circuit voltage of the battery, after the inspection, the upper limit voltage and charging current signal are sent out at the same time, the lithium battery enters the charging state, and the timing starts. One sampling period (sampling 256 positions) is about 7-8 seconds. The voltage and current are cyclically sampled. When starting online, the voltage difference (for example, 5mV), the current difference (for example, 5mA), and the time difference (for example, 1min) set by the upper computer are used as conditions to save the data of the battery. When starting the single machine, the voltage difference, the current difference, and the time difference set by the lower computer or sent by the upper computer to the lower computer are used as conditions to save the data of the battery. When the voltage reaches the upper limit voltage, the system switches to constant voltage. If it is constant current and constant voltage charging, the position is registered when the charging current is less than or equal to the termination current;

[0083] Step i, standby, during the standby period, the system neither charges nor discharges the lithium battery, but samples and detects it;

[0084] Step j, discharging, input discharging time, first sample the open circuit voltage of the lithium battery, then send out the discharging current signal after the inspection, the lithium battery enters the discharging state, and the timing starts. The voltage and current of the battery are cyclically sampled. The voltage difference (for example, 5mV), the current difference (for example, 5mA), and the time difference (for example, 1min) are used to save the data of the battery. When the battery voltage is less than or equal to the lower limit voltage, the battery position is registered. When the working time reaches the set discharging time, the machine registers or ends the step and moves to the next step.

[0085] Step k, capacity sorting, repeat step h, after the lithium battery is fully charged, real-time time, capacity, and power sorting of the lithium battery on the test needle bed 5 are performed. After the work is completed, the registered point sorting or the platform point sorting is selected. Then the upper limit value and the lower limit value of the time period to be sorted are input (the input order is not limited). The input range is between 0-999 minutes. The battery positions whose working time is greater than or equal to the lower limit value and less than the upper limit value are registered and the number of batteries in the range is displayed. After the work is completed, the registered point sorting or the platform point sorting is selected. Then the upper limit value and the lower limit value of the capacity segment to be sorted are input (the input order is not limited). The input range is between 0-9999mAh. The battery positions whose capacity is greater than or equal to the lower limit value and less than the upper limit value are registered and the number of batteries in the range is displayed.

[0086] In addition, in the upper step, individual lithium batteries are not correctly installed and are registered during the running process. The lithium battery is reinstalled and automatically de-registered when the next inspection is performed on the position (i.e., the lithium battery normally participates in the charging and discharging detection work). The lithium battery normally works and the system does not need to be restarted.

[0087] And, in the detection process, every two minutes, the test needle bed 5 is short-circuit detected, if the lithium battery short-circuit, the test needle bed 5 is clamped to the lithium battery shell or the clamp short-circuit, the lithium battery is registered, and then every time the lithium battery is sampled, it is detected, if the fault is not eliminated, the LED lamp corresponding to the test needle bed 5 is briefly extinguished and then brightened.

[0088] For the charging step, when constant current charging is performed, the sampling voltage is greater than or equal to the upper limit voltage, or the lithium battery voltage does not reach the upper limit voltage and decreases, when the decrease is greater than -ΔV, the lithium battery is registered, and -ΔV is in the range of -2V.

[0089] In order to improve the detection accuracy, the calibration voltage, in the discharging step, when the lithium battery voltage is less than the lower limit voltage, the lithium battery is immediately registered, and the lithium battery open circuit voltage is sampled once, if the open circuit voltage is greater than the sum of the calibration voltage and the lower limit voltage, the lithium battery is de-registered, the lithium battery continues to run, and the voltage sampling voltage value before calibration is calibrated, otherwise the lithium battery is registered.

[0090] In addition, regarding the voltage setting, the upper limit voltage, the lower limit voltage, and -ΔV are the conditions for terminating work, the upper limit voltage is less than the voltage maximum value; the lower limit voltage is less than the upper limit voltage, and -ΔV is less than the upper limit voltage.

[0091] Regarding the current setting, the charging current, the discharging current, and the termination current are necessary electrical parameters in operation, the charging and discharging currents are less than the current maximum value, and the termination current is less than the charging current. The termination current is one of the conditions for terminating work.

[0092] The above only describes the preferred embodiments of the present application and does not limit the present application, any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A charging and discharging testing device for power-swappable lithium batteries, characterized in that, include: The equipment includes a frame (1), a test power supply box (2), a power distribution box (3), an operation panel (4), and a test needle bed (5). The test power supply box (2), power distribution box (3), operation panel (4) and test needle bed (5) are all installed on the frame (1). The test power supply box (2), power distribution box (3) and test needle bed (5) are arranged in sequence along the horizontal direction. The test power supply box (2) and power distribution box (3) are respectively connected to the test needle bed (5). The operation panel (4) is used to control the test needle bed (5). The test needle bed (5) includes an upper heat dissipation fan (51), an upper needle bed (52), a battery fixing box (53), a lower needle bed (54), and a lower heat dissipation fan (55) arranged sequentially from top to bottom. The upper needle bed (52) and the lower needle bed (54) are movable and openable. The battery fixing box (53) is used to position and install lithium batteries. The test needle bed (5) is surrounded by a surrounding cooling assembly (6), which includes a surrounding airbag (61) and a connecting plate (62). The surrounding airbag (61) is U-shaped, and one side of its opening is for mounting a lithium battery onto the test needle bed (5). The upper and lower ends of the surrounding airbag (61) are connected to the upper needle bed (52) or the lower needle bed (54) respectively through the connecting plate (62). During the opening and closing movement of the upper needle bed (52) and the lower needle bed (54), the surrounding airbag (61) is expanded and compressed, causing the surrounding airbag (61) to spray out cooling airflow around the lithium battery to carry away heat.

2. The charging and discharging testing equipment for a power-swapping lithium battery according to claim 1, characterized in that: The surrounding airbag (61) is arranged in layers. The surrounding airbag (61) includes a number of layered airbags (611) from top to bottom. The layered airbag (611) is divided into a number of airbag cells (6111). The airbag cells (6111) are arranged at an angle. Each airbag cell (6111) sprays cooling gas from the jet hole (6112) along the angled direction.

3. The charging and discharging testing equipment for a power-swapping lithium battery according to claim 2, characterized in that: The airbag cells (6111) of the two adjacent layers of the layered airbags (611) are arranged in an alternating direction.

4. The charging and discharging testing equipment for a power-swapping lithium battery according to claim 2, characterized in that: Each layer of the airbag (611) has an inwardly recessed jet section at the jet section, forming an annular cooling jet channel (612).

5. The charging and discharging testing equipment for a power-swapping lithium battery according to claim 1, characterized in that: The upper needle bed (52) is driven to move up and down by the corresponding first cylinder (521), and the lower needle bed (54) is driven to move up and down by the corresponding second cylinder (531).

6. A testing method for a charging and discharging testing device for a power-swapping lithium battery according to any one of claims 1 to 5, characterized in that, Includes the following steps: Step a, upper part: Place the lithium battery on the corresponding test bed (5). At this time, the test bed (5) does not charge or discharge the lithium battery. Step b, sampling: The circuit board components in the test power supply box (2) collect current and voltage data of the lithium battery on the test needle bed (5) through the battery channel; Step c, voltage inspection: Power is supplied using the power supply in the test power supply box (2). The lithium battery stations on the test needle bed (5) are sampled in ascending order. Stations with voltages exceeding the upper limit or below the lower limit are stored. The number of stored stations is counted and displayed. Step d: Constant voltage inspection. Remove the lithium battery from the test needle bed (5), inspect the voltage, and store the workstations with voltages greater than the upper limit voltage UU+ constant voltage tolerance or less than the upper limit voltage UU- constant voltage tolerance. Count and display the number of stored workstations, and then reinstall the lithium battery. Step e: Leakage inspection. Register the workstations whose sampled current is greater than the set leakage current, and count and display the number of registered workstations. Step f: Charging inspection. Send a charging current value that is less than one percent of the maximum current value and the set upper limit voltage to inspect the battery. Register the workstations with current values ​​less than 0.5 times the charging current or greater than 1.5 times the charging current, and count and display the number of registered workstations. Step g: Discharge inspection. Send a discharge current value that is less than one percent of the maximum current value to inspect the battery. Register the workstations with current values ​​less than 0.5 times the discharge current or greater than 1.5 times the discharge current, and count and display the number of registered workstations. Step h, charging: input the charging time, start running, first sample the open circuit voltage of the battery, after inspection, send out the upper limit voltage and charging current signals at the same time, the lithium battery enters the charging state, and the timing starts. Step i, put on hold. During the put-on period, the system neither charges nor discharges the lithium battery, but performs sampling and detection. Step j: Discharge. Input the discharge time. First, sample the open-circuit voltage of the lithium battery. After inspection, send out the discharge current signal. The lithium battery enters the discharge process and the timing starts. Step k, capacity grading, repeat step h, after the lithium battery is fully charged, perform real-time time, capacity and power grading on the lithium battery on the test needle bed (5).

7. The method for detecting the charging and discharging of a power-swapping lithium battery according to claim 6, characterized in that: During the installation process, some lithium batteries were not installed correctly and were stored during operation. After reinstalling the lithium battery, it will be automatically deregistered during the next inspection of that station, and the lithium battery will work normally without the system needing to be restarted.

8. The method for detecting the charging and discharging of a power-swapping lithium battery according to claim 6, characterized in that: During the test, the test needle bed (5) is short-circuited every two minutes. If the lithium battery is short-circuited, the test needle bed (5) is clamped to the lithium battery casing or the fixture is short-circuited, the lithium battery is stored. Then, each time the lithium battery is sampled, it is tested. If the fault is not eliminated, the LED light corresponding to the test needle bed (5) will turn off briefly and then turn on again.

9. The method for detecting the charging and discharging of a power-swapping lithium battery according to claim 6, characterized in that: During the charging process, when constant current charging is performed, if the sampled voltage is greater than or equal to the upper limit voltage, or if the lithium battery voltage drops before reaching the upper limit voltage, the lithium battery is stored when the drop is greater than -ΔV.

10. The method for detecting the charging and discharging of a power-swapping lithium battery according to claim 6, characterized in that: During the discharge process, when the lithium battery voltage is lower than the lower limit voltage, the lithium battery is immediately stored and the open circuit voltage of the lithium battery is sampled once. If the open circuit voltage is greater than the sum of the calibration voltage and the lower limit voltage, the lithium battery is stored in reverse, allowing the lithium battery to continue operating, and the previous voltage sampling value is calibrated; otherwise, the lithium battery is stored.

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