Battery self-discharge detection device

Abstract

The utility model discloses a battery self-discharge detection device, which comprises a box body capable of being opened and closed, a battery fixing platform, a copper column and a lead, the box body capable of being opened and closed comprises a cover plate and a cavity, and the cover plate covers the cavity and can seal the cavity; the copper column is arranged on the cover plate and penetrates through the cover plate, the wire is arranged in the cavity and between the copper column and the battery fixing platform, and one end of the wire is connected with the copper column; the battery fixing platform is arranged at the bottom of the cavity, and a piston device is arranged at the top of the battery fixing platform and used for adjusting the fixing position of the battery; and a resistance measuring device connected with the copper column is arranged outside the box body and is used for measuring the resistance value of the battery in real time. According to the utility model, a low-temperature environment is established and the battery resistance is monitored, so that whether the square battery has a self-discharge behavior or not can be rapidly and efficiently tested at low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of battery monitoring, in particular to a battery self-discharge detection device. Background Art

[0002] With the wide use of batteries in various applications, especially the increasing importance of lithium-ion batteries in consumer electronics, automobiles and energy storage systems, it has become crucial to ensure the high performance and long life of batteries. Self-discharge is one of the key factors affecting battery performance and life. If the self-discharge rate is high during battery storage, it will lead to a reduction in the remaining battery power, thus affecting its usability in actual use. By studying and reducing battery self-discharge, the storage life and use efficiency of batteries can be improved, and the maintenance and replacement frequency of users can be reduced. Therefore, accurately measuring and evaluating battery self-discharge characteristics is of great significance for battery research and development and quality control. At the same time, harmful gases may be generated or thermal runaway may be triggered during the self-discharge process, posing safety hazards. Especially in electric vehicles and large energy storage systems, the safety of batteries is of utmost importance. Studying the self-discharge mechanism and prevention and control measures helps to improve the safety performance of batteries and prevent accidents.

[0003] Currently, the self-discharge test mainly adopts the static method, that is, after the battery is fully charged to the rated capacity, it is left standing for a period of time under certain environmental conditions, and then the open-circuit voltage of the battery is measured regularly. According to the voltage change and the discharge curve of the battery, the self-discharge rate is calculated. The inventor found in the research that this method has a long test cycle, usually taking several weeks or even months to obtain results, which prolongs the battery market launch time and affects the market competitiveness of products. It can be seen that the existing technology is not suitable for rapid evaluation. In addition, the inventor also found that environmental temperature and humidity have a great influence on the test results, and strict control of environmental conditions is required to ensure the accuracy of test results. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the utility model provides a battery self-discharge detection device, which can add liquid nitrogen into the box through a sealing device to establish a low-temperature environment and monitor the battery resistance, so as to quickly, efficiently and low-costly test whether the battery has self-discharge behavior.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A battery self-discharge detection device includes: a switchable box body, a battery fixing platform, copper columns and wires;

[0007] The switchable box body includes a cover plate and a cavity. The cover plate covers the upper part of the cavity and can seal the cavity. The copper column is arranged on the cover plate and passes through the cover plate. The wire is arranged inside the cavity, between the copper column and the battery fixing platform, and one end of the wire is connected to the copper column.

[0008] The battery fixing platform is arranged at the bottom of the cavity. A piston device is arranged at the top of the battery fixing platform for adjusting the fixing position of the battery. An impedance measuring device connected to the copper column is arranged outside the box body, and the impedance measuring device is used for measuring the impedance value of the battery in real time.

[0009] As a further technical solution, a liquid injection port is also arranged on the cover plate. The inlet end of the liquid injection port leads to the outside of the box body, and the outlet end of the liquid injection port leads to the inside of the cavity.

[0010] As a further technical solution, a sealing cover is arranged at the inlet end of the liquid injection port for sealing the box body after adding liquid nitrogen to maintain the low-temperature environment inside the box body.

[0011] As a further technical solution, the piston device includes a piston and a piston push rod.

[0012] As a further technical solution, a matching sealing ring is arranged on the contact surface between the cavity and the cover plate.

[0013] As a further technical solution, sealing edges are left on the periphery of the sealing ring for both the cavity and the cover plate. Bolt holes are arranged on the sealing edges of the cavity and the cover plate, and the cavity and the cover plate are connected by bolts and nuts in cooperation with the bolt holes.

[0014] As a further technical solution, the switchable box body is made of heat-insulating material.

[0015] As a further technical solution, a temperature sensor is arranged inside the cavity for monitoring the temperature inside the cavity.

[0016] As a further technical solution, the wire is a low-temperature resistant wire to ensure that the conductivity of the wire is not affected in a low-temperature environment.

[0017] As a further technical solution, a fixture is arranged on the battery fixing platform for clamping and fixing batteries of different sizes and types.

[0018] One or more technical solutions of the present utility model have the following beneficial effects:

[0019] (1) A resistance measuring device is connected to the copper posts outside the box body of the present utility model, which solves the problem that the existing technology has a long test period and usually takes several weeks or even months to obtain results, and is not suitable for rapid evaluation. The resistance measuring device of the present utility model is used to measure the resistance value of the battery in real time, and can realize fast, efficient and low-cost testing of whether the square battery has self-discharge behavior.

[0020] (2) The present utility model forms a sealed space by setting a switchable box body, and is provided with a liquid injection port through which liquid nitrogen can be filled into the sealed space to establish a low-temperature environment, which is beneficial to self-discharge testing. A temperature sensor is installed in the sealed space to monitor the temperature in real time. Coupled with the box body made of heat-insulating material, it can avoid the influence of environmental temperature and humidity on the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The attached drawings forming a part of this specification are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0022] Figure 1 It is a schematic structural diagram of the battery self-discharge detection device of the present utility model;

[0023] Among them: 1. Switchable box body; 2. Copper post; 3. Wire; 4. Battery fixing platform; 5. Piston device; 6. Battery; 7. Liquid injection port. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present utility model. Unless otherwise specified, all technical and scientific terms used in the present utility model have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0025] Embodiment 1

[0026] The present utility model provides a battery self-discharge detection device. The detection device in this embodiment is mainly aimed at testing the self-discharge phenomenon of the secondary battery itself without considering the influence of other external conditions. The batteries mentioned in this embodiment include but are not limited to these two types of batteries: lithium-ion batteries and sodium-ion batteries. As Figure 1 shown, a battery self-discharge detection device includes: a switchable box body 1 and a battery fixing platform 4. Among them, the switchable box body 1 is made of heat-insulating material to reduce the influence of the external environment on the temperature inside the box and avoid bringing errors to the test results. The battery fixing platform 4 is used to carry and fix the battery to be detected;

[0027] The switchable box body 1 includes a cover plate and a cavity (not shown in the figure). The battery fixing platform 4 is arranged at the bottom of the cavity. Among them, the cover plate covers the cavity and can seal the cavity. And a matching sealing ring is arranged on the contact surface between the cavity and the cover plate. Sealing edges are left on the peripheries of the cavity and the cover plate. And bolt holes are provided on the sealing edges of the cavity and the cover plate. The cavity and the cover plate are connected by bolts and nuts cooperating with the bolt holes. Through the arranged sealing ring and bolt holes, the cavity can be sealed and locked, which is convenient for placing the battery to be detected before the test and ensuring a sealed environment inside the cavity during the test, maintaining a low-temperature test environment, and avoiding bringing errors to the test results. And a temperature sensor is also arranged inside the cavity, which is used to monitor the temperature inside the cavity, ensure a low-temperature test environment, is beneficial to the self-discharge test of the battery, and avoid the temperature from generating errors to the test results.

[0028] Two copper posts are arranged on the cover plate of the switchable box body 1, and both copper posts pass through the cover plate. A wire is arranged inside the cavity. Among them, the wire is specifically arranged between the copper post and the battery fixing platform, and one end of the wire is connected to the copper post, and the other end is used to connect the positive and negative electrodes of the battery to be detected. In this embodiment, the wire is a low-temperature resistant wire to ensure that the conductivity of the wire is not affected in a low-temperature environment.

[0029] A liquid injection port is also arranged on the cover plate of the switchable box body 1. The inlet end of the liquid injection port leads to the outside of the box body, the outlet end of the liquid injection port leads to the inside of the cavity, and a sealing cover is arranged at the inlet end of the liquid injection port, which is used to seal the box body after adding liquid nitrogen to maintain the low-temperature environment inside the box.

[0030] A resistance measuring device (not shown in the figure) connected to two copper posts is arranged outside the switchable box body 1. The resistance measuring device is used to measure the resistance value of the battery in real time, and can quickly, efficiently and low-costly test whether the square battery has self-discharge behavior, solving the problem that the existing technology has a long test period, usually taking several weeks or even months to obtain results, and is not suitable for rapid evaluation.

[0031] A piston device is arranged on the top of the battery fixing platform 4, which can be used to adjust the fixing position of the battery. The piston device includes a piston and a piston push rod, which can fully adjust the fixing position of the battery to be detected after the battery to be detected is fixed, facilitating the testing of batteries with different specifications and sizes. It should be noted that for the piston device, those skilled in the art can adopt the existing piston device with a piston and a push rod as long as the above effects can be achieved. A clamp is also arranged on the battery fixing platform to clamp and fix the batteries to be detected with different sizes and types, so that this device can be applicable to complete the self-discharge test of more types and models of batteries.

[0032] In the battery self-discharge detection device mentioned in this embodiment, the specific method for detecting the battery self-discharge is as follows: First, the operator opens the cover plate, puts the battery to be detected into the cavity of the device, fixes the battery to be detected through the fixture on the battery fixing platform, and at the same time fully adjusts the fixing position of the battery to be detected by adjusting the piston device at the top of the battery fixing platform. Connect the two poles of the battery to be detected to the copper column through wires, then close the cover plate and lock it with bolts; the copper column can be externally connected to the test equipment, and the test equipment includes but is not limited to a resistance measuring device, and can also be a device for testing various battery performance data such as voltage. Then open the sealing cover at the inlet end of the liquid injection port, pour liquid nitrogen into the cavity through the liquid injection port to make the cavity full of liquid nitrogen, and then seal the liquid injection port; finally, after standing for a period of time, lower the temperature of the battery to stop the electrochemical reaction, and obtain the resistance value of the battery through the resistance measuring device to obtain the result of whether the battery to be detected has a self-discharge behavior.

[0033] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A battery self-discharge detection device, characterized in that: include: A switchable box, a battery fixing platform, copper pillars and wires; The switchable box includes a cover plate and a cavity, wherein the cover plate covers the cavity and can seal the cavity; the copper column is arranged on the cover plate and passes through the cover plate, the wire is arranged inside the cavity and between the copper column and the battery fixing platform, and one end of the wire is connected to the copper column; The battery fixing platform is arranged at the bottom of the cavity, and a piston device is arranged on the top of the battery fixing platform for adjusting the fixing position of the battery; a resistance measuring device connected to the copper column is arranged outside the box, and the resistance measuring device is used to measure the resistance value of the battery in real time.

2. A battery self-discharge detection device as claimed in claim 1, characterized in that: The cover plate is also provided with a liquid injection port, the inlet end of the liquid injection port leads to the outside of the box body, and the outlet end of the liquid injection port leads to the inside of the cavity.

3. A battery self-discharge detection device as claimed in claim 2, characterized in that: A sealing cover is provided at the inlet end of the liquid injection port, which is used to seal the box after adding liquid nitrogen to maintain a low temperature environment in the box.

4. A battery self-discharge detection device as claimed in claim 1, characterized in that: The piston device comprises a piston and a piston push rod.

5. A battery self-discharge detection device as claimed in claim 1, characterized in that: A matching sealing ring is arranged on the contact surface of the cavity and the cover plate.

6. A battery self-discharge detection device as claimed in claim 5, characterized in that: The cavity and the cover plate both have sealing edges on the periphery of the sealing ring, and bolt holes are provided on the sealing edges of the cavity and the cover plate, and the cavity and the cover plate are connected by bolts and nuts that cooperate with the bolt holes.

7. A battery self-discharge detection device as claimed in claim 1, characterized in that: The switchable box is made of heat-insulating material.

8. A battery self-discharge detection device as claimed in claim 1, characterized in that: A temperature sensor is arranged inside the cavity to monitor the temperature inside the cavity.

9. A battery self-discharge detection device as claimed in claim 1, characterized in that: The wire is a low temperature resistant wire to ensure that the conductive performance of the wire is not affected in a low temperature environment.

10. A battery self-discharge detection device as claimed in claim 1, characterized in that: The battery fixing platform is provided with a clamp for clamping and fixing batteries of different sizes and types.

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