Lithium-ion battery safety test post-discharge treatment device and discharge treatment box

Abstract

The utility model provides a lithium ion battery safety test post-discharge processing device, which belongs to the field of lithium ion battery processing. The utility model comprises a voltage detection relay KV, a temperature detection relay KH, a high-power resistor R, and an air switch QF. One end of a normally open contact KV1 of the voltage detection relay is connected to the positive electrode of a battery GB to be discharged, the other end of the normally open contact KV1 of the voltage detection relay is connected to one end of the air switch QF, the other end of the air switch QF is connected to one end of a normally open contact KH1 of the temperature detection relay, the other end of the normally open contact KH1 of the temperature detection relay is connected in series with the high-power resistor R, the voltage detection relay KV is connected to the battery GB to be discharged, the temperature detection relay KH is connected to the high-power resistor R, and a lithium ion battery safety test post-discharge processing box is also provided. The utility model has simple wiring, fewer measuring devices are used, the utility model is convenient to move, the utility model is convenient to operate, and the utility model is convenient to maneuver.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion battery processing, in particular to a lithium ion battery safety test post-discharge processing device and a discharge processing box. Background Art

[0002] Lithium-ion batteries are tested for safety before being put into use. Since most safety tests are destructive tests, the battery itself will be damaged to a certain extent both externally and internally. If it is transported or stored directly, there will be great safety hazards. In addition, in order to preserve the residual value of the battery to a greater extent, the laboratory also needs to classify the battery.

[0003] At present, laboratories mostly use salt water immersion or discharge treatment methods for batteries after safety tests. Among them, for batteries after needle puncture, thermal runaway and other tests, since the batteries are damaged after the test, it will bring certain safety risks to the operators, so salt water immersion is generally used for discharge treatment. This method is relatively mild and has low processing costs, but it is easy to produce hazardous waste liquid (including electrolyte), which is easy to corrode and pollute the battery shell and internal pole pieces, and the discharge cycle generally takes more than one month, the discharge treatment speed is slow, and there is also the disadvantage that the battery is difficult to transfer after soaking in water. If resistance discharge is used, the battery can be completely preserved and no waste gas and waste liquid are generated, but the discharge degree and temperature are difficult to control, and manual monitoring is required, which poses certain safety risks; if a charging and discharging cabinet is used to discharge the battery, the residual value of the battery can be preserved to the greatest extent, and it is easy to handle in the later stage, but the cost is high. For some post-test batteries that need to be handled on the spot, the charging and discharging cabinet is large in size and the equipment lacks mobility. Utility Model Content

[0004] The technical problem to be solved by the utility model is how to improve the mobility of discharge treatment after safety testing of lithium-ion batteries.

[0005] The utility model solves the above technical problems through the following technical solutions: a lithium-ion battery safety test post-discharge processing device, comprising a voltage detection relay KV, a temperature detection relay KH, a high-power resistor R, and an air switch QF, one end of a normally open contact KV1 of the voltage detection relay is connected to the positive electrode of a battery GB to be discharged, the other end of the normally open contact KV1 of the voltage detection relay is connected to one end of the air switch QF, the other end of the air switch QF is connected to one end of a normally open contact KH1 of the temperature detection relay, the other end of the normally open contact KH1 of the temperature detection relay is connected in series with the high-power resistor R and then connected to the negative electrode of the battery GB to be discharged, the voltage detection relay KV is connected to the battery GB to be discharged, and the temperature detection relay KH is connected to the high-power resistor R.

[0006] The utility model connects a voltage detection relay KV with a battery GB to be discharged to monitor the voltage of the battery GB to be discharged, and connects a temperature detection relay KH with a high-power resistor R to monitor the temperature of the high-power resistor R. The normally open contacts of the high-power resistor R, the voltage detection relay KV and the temperature detection relay KH are all connected in series in a discharge circuit of the battery GB to be discharged. The normally open contacts of the voltage detection relay KV and the temperature detection relay KH are all closed, so that the discharge processing of the battery GB to be discharged can be realized. The wiring is simple, fewer measuring devices are used, the battery GB to be discharged is convenient to move, and the operation is convenient. Compared with large equipment such as a charging and discharging cabinet, a lot of complex wiring is reduced, the cost can be greatly reduced, and the mobility is stronger.

[0007] Preferably, the model of the voltage detection relay KV is YYV-1, and the model of the temperature detection relay KH is YYW-2.

[0008] Preferably, the common end of the voltage detection relay KV is connected to one end of the air switch QF, the normally open end of the voltage detection relay KV is connected to the positive electrode of the battery GB to be discharged, the positive electrode detection end of the voltage detection relay KV is connected to the positive electrode of the battery GB to be discharged, the negative electrode detection end of the voltage detection relay KV is connected to the negative electrode of the battery GB to be discharged, the common end of the temperature detection relay KH is connected to the other end of the air switch QF, the normally open end of the temperature detection relay KH is connected to the high-power resistor R, and the thermocouple probe of the temperature detection relay KH is connected to the high-power resistor R.

[0009] Preferably, it also includes a DC power supply, which is respectively connected to the power supply ports of the voltage detection relay KV and the temperature detection relay KH.

[0010] Preferably, the voltage detection relay KV and the temperature detection relay KH both have display screens.

[0011] Preferably, the minimum temperature of the temperature detection relay KH is 50°C and the maximum temperature is 300°C.

[0012] Preferably, the battery GB to be discharged is one battery cell, the discharge cut-off voltage of the voltage detection relay KV is 2V or 2.8V, and the maximum voltage value ranges from 3V to 4V.

[0013] Preferably, the battery GB to be discharged is a multi-parallel n-series module with n cells connected in series, the discharge cut-off voltage of the voltage detection relay KV is 2nV or 2.8nV, and the maximum voltage value ranges from 3nV to 4nV.

[0014] The utility model also provides a lithium ion battery safety test post-discharge processing box, comprising the lithium ion battery safety test post-discharge processing device.

[0015] The advantages provided by the utility model are:

[0016] 1. The utility model connects the voltage detection relay KV with the battery GB to be discharged to monitor the voltage of the battery GB to be discharged, and connects the temperature detection relay KH with the high-power resistor R to monitor the temperature of the high-power resistor R. The normally open contacts of the high-power resistor R, the voltage detection relay KV and the temperature detection relay KH are all connected in series in the discharge circuit of the battery GB to be discharged. The normally open contacts of the voltage detection relay KV and the temperature detection relay KH are all closed, which can realize the discharge processing of the battery GB to be discharged. The wiring is simple, fewer measuring devices are used, it is convenient to move, and it is convenient to operate. Compared with large equipment such as charging and discharging cabinets, it can greatly reduce costs and has stronger mobility.

[0017] 2. When the discharge processing device of the utility model is used for different batteries, the corresponding discharge cut-off voltage and maximum voltage can be set in the voltage detection relay KV, which can avoid over-discharge of the battery, prevent damage to the battery caused by over-discharge, and preserve the residual value of the battery to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A circuit diagram of a lithium-ion battery safety test post-discharge processing device provided by an embodiment of the utility model;

[0019] Figure 2 A wiring diagram of a lithium-ion battery post-safety test discharge processing device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the technical solution of the utility model is clearly and completely described below in combination with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] like Figure 1As shown, this embodiment provides a lithium-ion battery safety test post-discharge processing device, including: a voltage detection relay KV, a temperature detection relay KH, a high-power resistor R, and an air switch QF, one end of the voltage detection relay normally open contact KV1 is connected to the positive electrode of the battery GB to be discharged, the other end of the voltage detection relay normally open contact KV1 is connected to one end of the air switch QF, the other end of the air switch QF is connected to one end of the temperature detection relay normally open contact KH1, the other end of the temperature detection relay normally open contact KH1 is connected in series with the high-power resistor R and then connected to the negative electrode of the battery GB to be discharged, the voltage detection relay KV is connected to the battery GB to be discharged for monitoring the voltage of the battery GB to be discharged, and the temperature detection relay KH is connected to the high-power resistor R for monitoring the temperature of the high-power resistor R.

[0022] The model of the voltage detection relay KV is YYV-1, and the model of the temperature detection relay KH is YYW-2. Figure 2 As shown, the common end of the voltage detection relay KV is connected to one end of the air switch QF, the normally open end of the voltage detection relay KV is connected to the positive electrode of the battery GB to be discharged, the positive detection end of the voltage detection relay KV is connected to the positive electrode of the battery GB to be discharged, the negative detection end of the voltage detection relay KV is connected to the negative electrode of the battery GB to be discharged, the common end of the temperature detection relay KH is connected to the other end of the air switch QF, the normally open end of the temperature detection relay KH is connected to the high-power resistor R, and the thermocouple probe of the temperature detection relay KH is connected to the high-power resistor R.

[0023] It also includes a DC power supply, which is respectively connected to the power supply ports of the voltage detection relay KV and the temperature detection relay KH. A 12V DC power supply can be used to power the voltage detection relay KV and the temperature detection relay KH.

[0024] The voltage detection relay KV and the temperature detection relay KH are both provided with display screens, which can monitor and display the voltage of the battery GB to be discharged and the temperature of the high-power resistor R in real time.

[0025] Working principle: When the discharge treatment device for lithium-ion battery safety test of the utility model is used to discharge the battery GB to be discharged, the safety status of the battery GB to be discharged is confirmed according to the test results, low-risk samples are transferred to the safe treatment room for treatment, and high-risk samples can be directly treated by the discharge treatment device of the utility model.

[0026] The battery GB to be discharged has been safety tested. A DC power supply is connected to supply power to the voltage detection relay KV and the temperature detection relay KH respectively. A discharge cut-off voltage V1 and a maximum voltage V2 are set in the voltage detection relay KV. A minimum temperature T1 and a maximum temperature T2 are set in the temperature detection relay KH. The voltage of the battery GB to be discharged is monitored in real time by the voltage detection relay KV, and the temperature of the high-power resistor R is monitored in real time by the temperature detection relay KH. When the voltage value of the battery GB to be discharged is greater than the maximum voltage V2 and the temperature of the high-power resistor R is less than the minimum temperature T1, the normally open contact KV1 of the voltage detection relay is closed, and the normally open contact KH1 of the temperature detection relay is closed, and the circuit is connected to discharge the battery GB to be discharged. When the voltage value of the battery GB to be discharged after discharge drops to the discharge cut-off voltage V1, the normally open contact KV1 of the voltage detection relay is disconnected, and the discharge process of the battery GB to be discharged is stopped. Alternatively, when the temperature detection relay KH detects that the temperature of the high-power resistor R reaches or exceeds the set maximum temperature T2, the normally open contact KH1 of the temperature detection relay is disconnected, and the discharge process of the battery GB to be discharged can also be ended.

[0027] In actual work, the minimum temperature T1 set in the temperature detection relay KH is 50°C, and the maximum temperature T2 is 300°C. The values ​​of the discharge cut-off voltage V1 and the maximum voltage V2 set in the voltage detection relay KV need to be determined according to the specific object to be tested. The discharge processing device of the utility model can be used for iron-lithium batteries or ternary batteries. When the battery GB to be discharged is a battery cell, the discharge cut-off voltage V1 set in the voltage detection relay KV is 2V or 2.8V, and the value of the maximum voltage V2 satisfies: 3V≤V2≤4V. In this embodiment, the maximum voltage V2 can be set to 3V. When the battery GB to be discharged is a multi-parallel n-series module with n batteries connected in series, the discharge cut-off voltage V1 is set in the voltage detection relay KV to 2nV or 2.8nV, and the value of the maximum voltage V2 satisfies: 3nV≤V2≤4nV.

[0028] The utility model adopts a voltage detection relay KV and a temperature detection relay KH. The voltage detection relay KV is used to monitor the voltage of the battery GB to be discharged in real time. The temperature detection relay KH is used to monitor the temperature of the high-power resistor R in real time. When the voltage of the battery GB to be discharged is lower than the set discharge cut-off voltage V1 or when the temperature detection relay KH detects that the temperature of the high-power resistor R reaches or exceeds the set maximum temperature T2, the voltage detection relay normally open contact KV1 or the temperature detection relay normally open contact KH1 can be automatically disconnected. No matter which one is disconnected first, the discharge circuit of the battery GB to be discharged can be automatically disconnected to avoid over-discharge of the battery, prevent damage to the battery caused by over-discharge, and preserve the residual value of the battery to the greatest extent. The voltage detection relay KV and the temperature detection relay KH can automatically control the connection or disconnection of the discharge circuit of the battery GB to be discharged. Compared with the manual control method, the discharge device is safer and more efficient in the discharge treatment of the battery GB to be discharged.

[0029] In addition, the discharge treatment device of the utility model has a simple structure, is easy to move, and is convenient to operate. Compared with large equipment such as charging and discharging cabinets, it can greatly reduce costs and has greater mobility.

[0030] In actual use, the discharge treatment device of the present invention is usually placed in a shell to form a discharge treatment box, which can further improve portability and safety when used for discharge treatment after safety testing of lithium-ion batteries.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lithium-ion battery safety test post-discharge treatment device, characterized in that: It includes a voltage detection relay KV, a temperature detection relay KH, a high-power resistor R, and an air switch QF. One end of the voltage detection relay normally open contact KV1 is connected to the positive electrode of the battery GB to be discharged, the other end of the voltage detection relay normally open contact KV1 is connected to one end of the air switch QF, the other end of the air switch QF is connected to one end of the temperature detection relay normally open contact KH1, the other end of the temperature detection relay normally open contact KH1 is connected in series with the high-power resistor R and then connected to the negative electrode of the battery GB to be discharged, the voltage detection relay KV is connected to the battery GB to be discharged, and the temperature detection relay KH is connected to the high-power resistor R.

2. The lithium-ion battery safety test post-discharge treatment device according to claim 1, characterized in that: The model of the voltage detection relay KV is YYV-1, and the model of the temperature detection relay KH is YYW-2.

3. The lithium-ion battery safety test post-discharge treatment device according to claim 2, characterized in that: The common end of the voltage detection relay KV is connected to one end of the air switch QF, the normally open end of the voltage detection relay KV is connected to the positive electrode of the battery GB to be discharged, the positive electrode detection end of the voltage detection relay KV is connected to the positive electrode of the battery GB to be discharged, the negative electrode detection end of the voltage detection relay KV is connected to the negative electrode of the battery GB to be discharged, the common end of the temperature detection relay KH is connected to the other end of the air switch QF, the normally open end of the temperature detection relay KH is connected to the high-power resistor R, and the thermocouple probe of the temperature detection relay KH is connected to the high-power resistor R.

4. The lithium-ion battery safety test post-discharge treatment device according to claim 1, characterized in that: It also includes a DC power supply, which is respectively connected to the power supply ports of the voltage detection relay KV and the temperature detection relay KH.

5. The lithium-ion battery safety test post-discharge treatment device according to claim 1, characterized in that: The voltage detection relay KV and the temperature detection relay KH both have display screens.

6. The lithium-ion battery safety test post-discharge treatment device according to claim 2, characterized in that: The minimum temperature of the temperature detection relay KH is 50°C and the maximum temperature is 300°C.

7. The lithium-ion battery post-safety test discharge treatment device according to claim 2 or 6, characterized in that: The battery GB to be discharged is a battery cell, the discharge cut-off voltage of the voltage detection relay KV is 2V or 2.8V, and the maximum voltage value ranges from 3V to 4V.

8. The lithium-ion battery safety test post-discharge treatment device according to claim 2 or 6, characterized in that: The battery GB to be discharged is a multi-parallel n-series module with n cells connected in series, the discharge cut-off voltage of the voltage detection relay KV is 2nV or 2.8nV, and the maximum voltage value ranges from 3nV to 4nV.

9. Lithium-ion battery safety test post-discharge treatment box, characterized by: The invention comprises the lithium ion battery safety test post-discharge treatment device as claimed in any one of claims 1 to 8.

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