High-temperature lithium ion battery pack automatic passivation device

Abstract

The utility model provides a kind of high-temperature lithium ion battery pack automatic de-passivation device, including battery pack state measurement unit, man-machine interactive unit, control and communication unit, activation unit and switch group switching unit, battery pack state measurement unit electric connection lithium battery pack;Man-machine interactive unit electric connection battery pack state measurement unit and control and communication unit;Control and communication unit electric connection lithium battery pack, switch group switching unit and activation unit, for sending data, receiving man-machine interactive unit control instruction, sending de-passivation control instruction;Activation unit electric connection man-machine interactive unit, including selected resistance and power load resistance matrix, load resistance matrix selective intercommunication switch group switching unit, to constitute different lithium battery pack activation loop;Switch group switching unit corresponds activation unit, and with lithium battery pack electric connection.The utility model can reliably controllably de-passivate high-temperature lithium electronic battery pack.

Description

Technical Field

[0001] This utility model generally relates to the field of high-temperature lithium battery technology, and more specifically, to a device capable of automatically, reliably, and controllably depassivating high-temperature lithium-ion battery packs. Background Technology

[0002] Currently, in the field of oil exploration, high-temperature lithium-ion battery packs serve as a crucial power source, and their performance stability is paramount. After long-term storage, when lithium-ion batteries come into contact with the negative electrode metallic lithium, a reaction occurs, forming a dense passivation film on the surface of the negative electrode lithium. The main component of this passivation film is LiCl, which effectively prevents further chemical reactions between the electrolyte thionyl chloride and lithium metal, thereby improving the battery's cycle life and giving it excellent storage performance. However, the passivation film also restricts the flow of lithium ions from the metal surface to the electrolyte, leading to increased internal resistance and a lower initial load voltage. Therefore, it is necessary to discharge the lithium-ion battery pack for a period of time. After a certain period, the battery voltage will rebound, gradually returning to the rated voltage. This process is called depassivation or activation of the lithium-ion battery.

[0003] The existing solutions for depassivating lithium batteries mainly include the following two types.

[0004] 1. Automatic depassivation solution for single-cell lithium batteries

[0005] The basic principle is to utilize the conduction condition of a PNP transistor to automatically control discharge activation. If the lithium battery is in a passivation state, its voltage is less than 3.6V, the PNP transistor is in the conducting state, thus activating the discharge activation circuit. If the passivation state is deactivated, its voltage is slightly higher than 3.6V, the PNP transistor is cut off, thus deactivating the discharge activation circuit. The advantage of this scheme is its simple circuitry and lack of external power supply, but it only supports depassivation of a single lithium battery (3.7V) and cannot perform depassivation operations on higher voltage lithium battery packs.

[0006] 2. Manual Lithium-ion Battery Pack Depassivation Solution

[0007] This solution uses a voltage divider to depassivate the lithium battery pack. The depassivation module contains multiple parallel branches, each with a series switch and resistor. Operators can close different switches to flexibly adjust the resistance value, discharging the lithium battery pack at different resistance levels. A built-in battery status detector visually displays the working status of the lithium-ion battery pack. The disadvantages are that it relies on manual operation, resulting in low efficiency and potential safety hazards.

[0008] Therefore, how to perform high-temperature lithium-ion battery passivation operations automatically, reliably, and controllably, without manual intervention, thereby reducing manual operation costs and safety hazards, and significantly improving work efficiency, is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0009] One of the main objectives of this invention is to overcome at least one of the defects of the prior art and provide an automatic depassivation device for high-temperature lithium-ion battery packs that can automatically, reliably and controllably depassivate high-temperature lithium-ion battery packs.

[0010] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0011] According to one aspect of the present invention, an automatic depassivation device for high-temperature lithium-ion battery packs is provided, comprising:

[0012] A battery pack state measurement unit is electrically connected to a lithium battery pack and is used to collect data from the lithium battery pack.

[0013] The human-machine interaction unit is electrically connected to the battery pack status measurement unit and the control and communication unit, and is used to view battery pack data and send control commands.

[0014] A control and communication unit, electrically connected to a lithium battery pack, a switch group switching unit, and an activation unit, is used to send data, receive control commands from the human-machine interaction unit, and send de-passivation control commands.

[0015] An activation unit, electrically connected to the human-machine interaction unit, includes a load resistor matrix with selected resistance value and power. The load resistor matrix is ​​selectively connected to a switch group switching unit to form different lithium battery pack activation circuits.

[0016] A switch group switching unit, which corresponds to the activation unit and is electrically connected to the lithium battery pack.

[0017] According to one embodiment of the present invention, the battery pack state measurement unit includes an internal resistance tester.

[0018] According to one embodiment of the present invention, the human-computer interaction unit includes an industrial control computer and a PC, the industrial control computer and the PC are electrically connected, and the industrial control computer receives data information sent by the internal resistance tester.

[0019] According to one embodiment of the present invention, the control and communication unit includes a microcontroller and a serial transceiver.

[0020] According to one embodiment of the present invention, the switching unit includes a voltage acquisition unit and a solid-state relay group.

[0021] According to one embodiment of the present invention, the high-temperature lithium-ion battery pack automatic depassivation device further includes a real-time protection unit, which is electrically connected to the control and communication unit and is used for overcurrent protection and undervoltage protection during the depassivation process.

[0022] According to one embodiment of the present invention, the real-time protection unit includes a fuse, a fast comparator, and a power switch.

[0023] According to one embodiment of the present invention, a current sensor is electrically connected between the control and communication unit and the negative electrode of the lithium battery pack.

[0024] According to one embodiment of the present invention, the activation unit further includes an electronic load and a load resistor matrix. The electronic load is electrically connected to the switch group switching unit and the human-machine interaction unit. The load resistor matrix is ​​electrically connected to the switch group switching unit. The current sensor is connected in series with the electronic load / load resistor matrix.

[0025] According to one embodiment of the present invention, a voltage acquisition device is electrically connected between the control and communication unit and the positive electrode of the lithium battery pack.

[0026] As can be seen from the above technical solution, the advantages and positive effects of the automatic depassivation device for high-temperature lithium-ion battery packs of this utility model are as follows:

[0027] This invention employs a human-machine interface unit for operation and controls the activation unit and switch group switching unit through a control and communication unit. This automatically connects the corresponding circuits when the set value is reached, enabling high-temperature lithium-ion battery depassivation without manual intervention. This allows for automatic, reliable, and controllable depassivation of high-temperature lithium-ion battery packs, reducing manual operation costs and safety hazards, and significantly improving work efficiency. Attached Figure Description

[0028] The various objectives, features, and advantages of this invention will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. The drawings are merely illustrative of the invention and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts. Wherein:

[0029] Figure 1 This is a schematic diagram of the automatic depassivation device for high-temperature lithium-ion battery packs of the present invention, shown in an exemplary embodiment.

[0030] Figure 2This is a schematic diagram of the microcontroller structure in the automatic depassivation device for high-temperature lithium-ion battery packs of the present invention, shown in an exemplary embodiment.

[0031] Figure 3 This is a schematic diagram of the serial transceiver in the automatic depassivation device for high-temperature lithium-ion battery packs of the present invention, shown in an exemplary embodiment.

[0032] Figure 4 This is a schematic diagram of the real-time protection unit in the automatic depassivation device for high-temperature lithium-ion battery packs of the present invention, shown in an exemplary embodiment.

[0033] Figure 5 This is a schematic diagram of the voltage acquisition device in the automatic depassivation device for high-temperature lithium-ion battery packs of the present invention, shown in an exemplary embodiment.

[0034] Figure 6 This is a schematic diagram of the solid-state relay group in the automatic depassivation device for high-temperature lithium-ion battery packs of the present invention, shown in an exemplary embodiment.

[0035] Figure 7 This is a schematic diagram illustrating the working process of the automatic depassivation device for high-temperature lithium-ion battery packs of the present invention, as shown in an exemplary embodiment.

[0036] Drawing number explanation:

[0037] 1. Battery pack status measurement unit;

[0038] 2. Human-computer interaction unit;

[0039] 3. Control and communication unit;

[0040] 4. Activation unit;

[0041] 5. Switch group switching unit;

[0042] 6. Lithium battery pack;

[0043] 7. Real-time protection unit;

[0044] 8. Circuit board;

[0045] 9. Current sensor;

[0046] 11. Internal resistance tester;

[0047] 21. Industrial control computer;

[0048] 22. PC;

[0049] 31. Microcontroller;

[0050] 32. Serial transceiver;

[0051] 41. Load resistor matrix;

[0052] 42. Electronic load;

[0053] 51. Voltage acquisition device;

[0054] 52. Solid-state relay group. Detailed Implementation

[0055] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0056] In the following description of various examples of the present invention, reference is made to the accompanying drawings, which form part of the present invention, and which illustrate by way of example different exemplary structures, systems, and steps that can implement various aspects of the present invention. It should be understood that other specific embodiments of the components, structures, exemplary devices, systems, and steps may be used, and structural and functional modifications may be made without departing from the scope of the present invention. Furthermore, although the terms “top,” “bottom,” “front,” “rear,” “side,” etc., may be used in this specification to describe various exemplary features and elements of the present invention, these terms are used herein only for convenience, such as the orientation according to the examples shown in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the present invention.

[0057] like Figure 1 As shown, this utility model discloses an automatic depassivation device for high-temperature lithium-ion battery packs, comprising a battery pack status measurement unit 1, a human-machine interface unit 2, a control and communication unit 3, an activation unit 4, and a switch group switching unit 5. The battery pack status measurement unit 1 is electrically connected to a lithium battery pack 6 and is used to collect data from the lithium battery pack 6. The human-machine interface unit 2 is electrically connected to the battery pack status measurement unit 1 and the control and communication unit 3, and is used to view battery pack data and send control commands. The control and communication unit 3 is electrically connected to the lithium battery pack 6, the switch group switching unit 5, and the activation unit 4, and is used to send data, receive control commands from the human-machine interface unit 3, and send depassivation control commands. The activation unit 4 is electrically connected to the human-machine interface unit 3 and includes a load resistor matrix 41 with selected resistance and power. The load resistor matrix 41 is selectively connected to the switch group switching unit 5 to form different activation circuits for the lithium battery pack 6. The switch group switching unit 5 corresponds to the activation unit 4 and is electrically connected to the lithium battery pack 6.

[0058] According to one embodiment of this utility model, the battery pack state measurement unit 1 includes an internal resistance tester 11. The state measurement of the lithium battery pack 6 is mainly completed by the high-precision, high-resolution internal resistance tester 11. The measuring instrument is connected to the industrial control computer 21 via a USB-TypeC data cable for remote control and data acquisition and analysis.

[0059] According to one embodiment of this utility model, the human-machine interaction unit 2 includes an industrial control computer 21 and a PC 22, which are electrically connected. The industrial control computer 21 receives data information sent by the internal resistance tester 11. The human-machine interaction unit 2 is a platform for issuing control commands, viewing data of the lithium battery pack 6, and printing test reports. The PC 22 and the industrial control computer 21 are connected via a 5-meter network cable. Operators can remotely control the depassivation operation of the lithium battery pack 6 through the matching host computer software on the PC 22.

[0060] According to one embodiment of the present invention, the control and communication unit 3 includes a microcontroller 31 and a serial transceiver 32. The structure of the microcontroller 31 is as follows: Figure 2 As shown, the structure of the serial transceiver 32 is as follows: Figure 3 As shown. The control and communication unit 3 consists of an STMicroelectronics (ST) STM32F103VET6 microcontroller, a MAX3223 serial transceiver, and peripheral devices. It is used for sending data, receiving control commands from the human-machine interface unit 2, and sending de-passivation control commands. Together with the human-machine interface unit 2, it forms the control core of the entire de-passivation device. The two communicate with each other via an RS232 serial port.

[0061] According to one embodiment of the present invention, the switch group switching unit 5 includes a voltage acquisition unit 51 and a solid-state relay group 52. The voltage acquisition unit 51 has the following structure: Figure 5 As shown, the positive terminal of the lithium battery pack 6 is electrically connected, and it is also electrically connected to the microcontroller 31. The solid-state relay group 52 has the following structure: Figure 6 As shown, different circuits are selectively connected according to control commands. The switch group switching unit 5 consists of a voltage acquisition unit 51, a solid-state relay group 52, and its peripheral devices, and is used for load switching after different voltage battery packs are connected. The microcontroller 31 determines the model of the lithium battery pack 6 through the voltage acquisition unit 51, and then controls the solid-state relay group 52 to switch different load switches to perform different discharge operations on the lithium battery pack 6.

[0062] According to one embodiment of this utility model, the high-temperature lithium-ion battery pack automatic depassivation device further includes a real-time protection unit 7. The real-time protection unit 7 is electrically connected to the control and communication unit 3 and is used for overcurrent protection and undervoltage protection during the depassivation process. The structure of the real-time protection unit 7 is as follows: Figure 4As shown, it is used for overcurrent and undervoltage protection. The real-time protection unit 7 consists of a fuse, a fast comparator, and a power switch, and is used for overcurrent and undervoltage protection during the depassivation process. The protection threshold can be configured by the operator through the accompanying host computer software on the PC 22, and the response speed is in the microsecond range.

[0063] According to one embodiment of the present invention, the real-time protection unit 7 includes a fuse, a fast comparator, and a power switch.

[0064] According to one embodiment of the present invention, a current sensor 9 is electrically connected between the control and communication unit 3 and the negative terminal of the lithium battery pack 6.

[0065] According to one embodiment of this utility model, the activation unit 4 further includes an electronic load 42 and a load resistor matrix 41. The electronic load 42 is electrically connected to the switch group switching unit 5 and the human-machine interaction unit 2, and the load resistor matrix 41 is electrically connected to the switch group switching unit 5. The current sensor 9 is connected in series with the electronic load 42 / load resistor matrix 41. The activation unit 4, composed of a load resistor matrix 41 with selected resistance and power, is used to construct the activation circuit of the lithium battery pack 6. The resistance value is selected based on a large amount of experimental data from various types of lithium battery packs.

[0066] According to one embodiment of this utility model, a voltage acquisition unit 51 is electrically connected between the control and communication unit 3 and the positive terminal of the lithium battery pack 6. The control and communication unit 3, the switch group switching unit 5, the real-time protection unit 7, the current sensor 9, and the load resistor matrix 41 are integrated on the circuit board 8.

[0067] The working process of this utility model is as follows: Figure 7As shown, after the industrial control computer 21 of the depassivation device is powered on, the software begins initialization and displays a startup screen for a certain duration. Then, the main menu interface is entered, which includes functions such as activation detection, data viewing, and data printing. The system depassivation process is as follows: First, the open-circuit voltage of the lithium battery pack 6 under test is measured. If the measured open-circuit voltage shows a mismatch between positive and negative logic and the calibration, or if the voltage of one or more cells is zero, the battery pack is determined to be incorrectly inserted or selected, and an alarm message is given. If the measured open-circuit voltage and internal resistance values ​​of each battery cell are outside the specified range, the battery pack is determined to be unqualified, and an alarm message is given. If the measured values ​​are within the specified range, the activation phase begins. The activation time is determined by the type of battery pack under test (the software has a built-in table for the types of batteries under test and the corresponding activation times). After the activation time is up, activation is disconnected, and the load voltage of each cell in the battery pack is measured. If the load voltage is qualified, the data is stored and the measurement phase ends; if it is unqualified, the activation detection process is repeated until it is qualified. To ensure security, the total number of activation attempts is capped at 3. If activation fails 3 times, the activation process will be terminated.

[0068] This invention provides an automatic depassivation device for high-temperature lithium-ion battery packs, solving the problems of traditional depassivation methods that rely on manual operation, are inefficient, and pose safety hazards. This device has broad application prospects in the oil exploration field, not only improving the performance stability of lithium battery packs but also reducing the safety risks and time costs associated with depassivation. In the future, with continuous technological advancements and the expansion of application areas, this device is expected to provide solutions for more industries.

[0069] As can be seen from the above technical solution, the advantages and positive effects of the automatic depassivation device for high-temperature lithium-ion battery packs of this utility model are as follows:

[0070] This invention uses a human-machine interaction unit 2 for operation, and controls the activation unit 4 and the switch group switching unit 5 through the control and communication unit 3. This allows the corresponding circuit to be automatically connected when the set value is reached, enabling high-temperature lithium-ion battery depassivation without manual intervention. This allows for automatic, reliable and controllable depassivation of high-temperature lithium-ion battery packs, reducing manual operation costs and safety hazards, and significantly improving work efficiency.

[0071] Those skilled in the art to which this utility model pertains should understand that the specific structures and processes shown in the above detailed embodiments are merely exemplary and not restrictive. Furthermore, those skilled in the art can combine the various technical features described above in various possible ways to form new technical solutions or make other modifications, all of which fall within the scope of this utility model.

Claims

1. An automatic depassivation device for high-temperature lithium-ion battery packs, characterized in that, include: A battery pack state measurement unit is electrically connected to a lithium battery pack and is used to collect data from the lithium battery pack. The human-machine interaction unit is electrically connected to the battery pack status measurement unit and the control and communication unit, and is used to view battery pack data and send control commands. A control and communication unit, electrically connected to a lithium battery pack, a switch group switching unit, and an activation unit, is used to send data, receive control commands from the human-machine interaction unit, and send de-passivation control commands. An activation unit, which is electrically connected to the human-machine interaction unit, includes a load resistor matrix with selected resistance value and power. The load resistor matrix is ​​selectively connected to a switch group switching unit to form different lithium battery pack activation circuits. A switch group switching unit, which corresponds to the activation unit and is electrically connected to the lithium battery pack.

2. The automatic depassivation device for high-temperature lithium-ion battery packs as described in claim 1, characterized in that, The battery pack state measurement unit includes an internal resistance tester.

3. The automatic depassivation device for high-temperature lithium-ion battery packs as described in claim 2, characterized in that, The human-machine interaction unit includes an industrial control computer and a PC, which are electrically connected. The industrial control computer receives data information sent by the internal resistance tester.

4. The automatic depassivation device for high-temperature lithium-ion battery packs as described in claim 1, characterized in that, The control and communication unit includes a microcontroller and a serial transceiver.

5. The automatic depassivation device for high-temperature lithium-ion battery packs as described in claim 1, characterized in that, The switching unit includes a voltage acquisition unit and a solid-state relay group.

6. The automatic depassivation device for high-temperature lithium-ion battery packs as described in any one of claims 1-5, characterized in that, The high-temperature lithium-ion battery pack automatic depassivation device also includes a real-time protection unit, which is electrically connected to the control and communication unit and is used for overcurrent protection and undervoltage protection during the depassivation process.

7. The automatic depassivation device for high-temperature lithium-ion battery packs as described in claim 6, characterized in that, The real-time protection unit includes a fuse, a fast comparator, and a power switch.

8. The automatic depassivation device for high-temperature lithium-ion battery packs as described in any one of claims 1-5, characterized in that, A current sensor is electrically connected between the control and communication unit and the negative terminal of the lithium battery pack.

9. The automatic depassivation device for high-temperature lithium-ion battery packs as described in claim 8, characterized in that, The activation unit further includes an electronic load and a load resistor matrix. The electronic load is electrically connected to the switch group switching unit and the human-machine interaction unit. The load resistor matrix is ​​electrically connected to the switch group switching unit. The current sensor is connected in series with the electronic load / load resistor matrix.

10. The automatic depassivation device for high-temperature lithium-ion battery packs as described in claim 9, characterized in that, A voltage acquisition device is electrically connected between the control and communication unit and the positive electrode of the lithium battery pack.

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