Device and system for measuring internal temperature of battery

Abstract

The utility model provides a device and a system for measuring the internal temperature of a battery. The battery internal temperature measuring device comprises a thermocouple, a wireless communication module and a temperature display module, the thermocouple is arranged in a shell of a target battery, the wireless communication module comprises a data sending unit and a data receiving unit which are in wireless communication connection, the data sending unit is arranged in the shell of the target battery, and the temperature display module is arranged in the shell of the target battery. The data receiving unit is arranged in the external environment of the target battery, and the temperature display module is connected with the data output end of the data receiving unit. According to the utility model, the internal temperature of the battery detected by the thermocouple is transmitted to the temperature display module in a wireless communication mode, so that poor sealing of the battery caused by the fact that a temperature sensing line needs to be led out from the interior of the battery is avoided, and the safety of the battery in the charging and discharging test process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a device and a system for measuring the internal temperature of a battery. Background Art

[0002] During the charging and discharging process of a battery, heat will accumulate. Generally, a thermocouple for monitoring temperature is installed on the surface of the battery. However, there is a certain temperature difference between the inside and the surface of the battery. Therefore, when conducting some charge and discharge tests simulating extreme working conditions, it is necessary to monitor the internal temperature of the battery to ensure the safety of the battery and provide accurate temperature correction data for the subsequent formation of a battery pack.

[0003] In the related art, the internal temperature of a battery can be collected through a thermocouple to monitor the temperature change of the battery. For example, the thermocouple can be implanted into the battery, and then the temperature sensing wire connected to the thermocouple is led out from the inside of the battery to utilize the temperature sensing wire to feedback the temperature collected by the thermocouple. However, leading the temperature sensing wire out from the inside of the battery will cause poor sealing at the position where the temperature sensing wire is led out, increasing the safety hazard of the battery. Summary of the Utility Model

[0004] The embodiments of the utility model provide a device and a system for measuring the internal temperature of a battery, which can improve the safety of the battery during the charge and discharge test process.

[0005] In a first aspect, the embodiments of the utility model provide a device for measuring the internal temperature of a battery, and the device for measuring the internal temperature of the battery includes:

[0006] A thermocouple, arranged inside the housing of the target battery;

[0007] A wireless communication module, including a data sending unit and a data receiving unit that are wirelessly communicatively connected. The data sending unit is arranged inside the housing of the target battery and is connected to the data output end of the thermocouple, and the data receiving unit is arranged in the external environment of the target battery;

[0008] A temperature display module, connected to the data output end of the data receiving unit.

[0009] In one embodiment, the device for measuring the internal temperature of the battery includes a plurality of the thermocouples, and the plurality of thermocouples are respectively arranged at different positions inside the housing of the target battery.

[0010] In one embodiment, at least one of the thermocouples is arranged at at least one of the positions of the positive electrode, the negative electrode, and the surface of the winding core inside the housing of the target battery.

[0011] In one embodiment, the data output ends of the plurality of thermocouples are connected to the same data sending unit.

[0012] In one embodiment, the thermocouple is fixed inside the housing of the target battery by an insulating adhesive.

[0013] In one embodiment, the measuring device for the internal temperature of the battery further includes an insulating adhesive cleaning module, and a preset organic solvent is stored in the insulating adhesive cleaning module.

[0014] In one embodiment, the thermocouple is a Type B thermocouple or a Type S thermocouple.

[0015] In one embodiment, an anti-corrosion coating is provided on the surface of the thermocouple.

[0016] In a second aspect, an embodiment of the present invention provides a measuring system for the internal temperature of a battery. The measuring system for the internal temperature of the battery includes the measuring device for the internal temperature of the battery as described in any one of the above and a target battery.

[0017] In one embodiment, the target battery is a square battery or a cylindrical battery.

[0018] Advantageous effects of the embodiments of the present invention:

[0019] In the embodiments of the present invention, the internal temperature of the battery detected by the thermocouple is transmitted to the temperature display module in a wireless communication manner, avoiding poor battery sealing caused by the need to lead out the temperature sensing wire from the inside of the battery, and improving the safety of the battery during the charge and discharge test process. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 is a schematic structural diagram of an embodiment of the measuring device for the internal temperature of the battery provided by the present invention;

[0022] Figure 2 is a schematic diagram of the relative position relationship between the measuring device for the internal temperature of the battery provided by the present invention and a target battery;

[0023] Figure 3 is a schematic structural diagram of another embodiment of the measuring device for the internal temperature of the battery provided by the present invention;

[0024] Figure 4 is a schematic structural diagram of still another embodiment of the measuring device for the internal temperature of the battery provided by the present invention;

[0025] Figure 5 This is a schematic structural diagram of an embodiment of the battery internal temperature measurement system provided by the present utility model.

[0026] Description of reference numerals:

[0027] 10. Battery internal temperature measurement system; 100. Battery internal temperature measurement device; 200. Target battery; 110. Thermocouple; 120. Wireless communication module; 121. Data sending unit; 122. Data receiving unit; 130. Temperature display module. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present utility model.

[0029] In addition, in the present utility model, unless otherwise stated, the orientation terms such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; and "inner" and "outer" refer to the contour of the device; the meaning of "a plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In order to improve the safety of the battery during the charge and discharge test process, the embodiments of the present application provide a battery internal temperature measurement device and system. By wirelessly communicating the battery internal temperature detected by the thermocouple to the temperature display module, it avoids the poor battery sealing caused by the need to lead out the temperature sensing wire from the battery interior, and improves the safety of the battery during the charge and discharge test process. For the specific solution, please refer to the following specific description.

[0031] Please refer to Figure 1 , the battery internal temperature measurement device 100 provided by the embodiments of the present application includes a thermocouple 110, a wireless communication module 120, and a temperature display module 130.

[0032] The thermocouple 110 is disposed inside the housing of the target battery 200, that is, disposed in the accommodation cavity formed by the housing of the target battery 200, so as to facilitate the thermocouple 110 to collect the internal temperature of the target battery 200. The thermocouple 110 is a temperature measuring element in a temperature measuring instrument. It can directly measure the temperature, convert the collected temperature signal into a thermoelectromotive force signal, and output the thermoelectromotive force signal through the data output end of the thermocouple 110. The thermocouple 110 in this embodiment can be, for example, a micro thermocouple, so as to facilitate placing the thermocouple 110 inside the housing of the target battery 200.

[0033] The wireless communication module 120 is configured to transmit the thermoelectromotive force signal output from the data output end of the thermocouple 110 to the temperature display module 130. Specifically, the wireless communication module 120 includes a data sending unit 121 and a data receiving unit 122. The data sending unit 121 is in wireless communication connection with the data receiving unit 122, and the data sending unit 121 can send data to the data receiving unit 122 in a wireless communication manner. The specific form of wireless communication can be, for example, Bluetooth, ZigBee, etc.

[0034] The data sending unit 121 is disposed inside the housing of the target battery 200 and is connected to the data output end of the thermocouple 110, while the data receiving unit 122 is disposed in the external environment of the target battery 200. Based on the wireless communication connection between the data sending unit 121 and the data receiving unit 122, the data sending unit 121 can transmit the thermoelectromotive force signal output from the data output end of the thermocouple 110 to the data receiving unit 122 in a wireless communication manner, avoiding poor battery sealing caused by the need to lead out the temperature sensing wire from inside the battery. In addition, the data sending unit 121 and the data receiving unit 122 also need to be paired in advance so as to establish a wireless communication connection between the data sending unit 121 and the data receiving unit 122 after device pairing.

[0035] The temperature display module 130 is connected to the data output end of the data receiving unit 122, so as to facilitate the data receiving unit 122 to transmit the received thermoelectromotive force signal to the temperature display module 130. Since the temperature display module 130 receives the thermoelectromotive force signal, the temperature display module 130 can also convert the thermoelectromotive force signal into a specific temperature value. The temperature display module 130 also includes a display screen, and this display screen is used to display the specific temperature value. In this way, during the charge and discharge test of the target battery 200, the tester can understand the internal temperature of the target battery 200 by viewing this display screen, ensuring that the target battery 200 can be safely charged and discharged. In addition, in order to facilitate the tester to understand the change situation of the internal temperature of the target battery 200, this display screen can also display the change curve graph of the internal temperature of the target battery 200.

[0036] In some embodiments of the present application, please refer to Figure 2 , Figure 2 which shows a schematic diagram of the relative position relationship between the measuring device 100 of the internal temperature of the battery and the target battery 200. As can be seen from Figure 2 , the thermocouple 110 and the data sending unit 121 are arranged inside the housing of the target battery 200, while the data receiving unit 122 and the temperature display module 130 are arranged in the external environment of the target battery 200. The data sending unit 121 is wirelessly communicatively connected to the data receiving unit 122, avoiding poor battery sealing caused by the need to lead out the temperature sensing wire from inside the battery.

[0037] In some embodiments of the present application, please refer to Figure 3 , Figure 3 which shows another schematic structural diagram of the measuring device 100 of the internal temperature of the battery. In Figure 3 , the measuring device 100 of the internal temperature of the battery includes a plurality of thermocouples 110. The plurality of thermocouples 110 are respectively arranged at different positions inside the housing of the target battery 200 to facilitate simultaneous acquisition of the temperatures at multiple different positions inside the target battery 200. During the charge and discharge test of the target battery 200, the tester can understand the temperatures at multiple different positions inside the target battery 200 by checking the temperature display module 130, ensuring that the target battery 200 can be charged and discharged more safely.

[0038] In some embodiments of the present application, the plurality of thermocouples 110 can be respectively arranged at designated positions inside the housing of the target battery 200. The designated positions refer to the positions that may have a rapid temperature rise during the charge and discharge process, such as the positive electrode, negative electrode, etc. inside the housing of the target battery 200. Therefore, at least one thermocouple 110 can be arranged at the positive electrode position inside the housing of the target battery 200, and / or at least one thermocouple 110 can be arranged at the negative electrode position inside the housing of the target battery 200.

[0039] In some embodiments of the present application, the plurality of thermocouples 110 can be respectively arranged at the positions that need to be focused on for temperature control inside the housing of the target battery 200, such as the surface of the winding core inside the housing of the target battery 200. Taking the target battery 200 as a square battery as an example, the winding core inside the housing of the target battery 200 is also square. At this time, the surface of the winding core includes two winding core surfaces with the largest area and the winding core side surfaces adjacent to these two winding core surfaces. Therefore, at least one thermocouple 110 can be arranged on at least one winding core surface with the largest area, and / or at least one thermocouple 110 can be arranged on at least one winding core side surface.

[0040] In some embodiments of the present application, as Figure 3As shown, the data output terminals of multiple thermocouples 110 can be connected to the same data transmission unit 121 in the wireless communication module 120. For example, the data output terminals of all the thermocouples 110 in the measuring device 100 for the internal temperature of the battery are connected to the same data transmission unit 12, so as to transmit the thermal electromotive force signals of the multiple thermocouples 110 to the data receiving unit 122 through the same data transmission unit 121, thereby reducing the hardware cost when measuring the internal temperature of the battery.

[0041] In some other embodiments of the present application, as Figure 4 shown, multiple data transmission units 121 are provided in the wireless communication module 120, and the data output terminals of at least two thermocouples 110 are respectively connected to different data transmission units 121, so as to transmit the thermal electromotive force signals of different thermocouples 110 to the data receiving unit 122 through different data transmission units 121.

[0042] Regarding the data receiving unit 122 in the wireless communication module 120, only one data receiving unit 122 can be provided or multiple data receiving units 122 can be provided simultaneously. When only one data receiving unit 122 is provided, the data receiving unit 122 can simultaneously receive the thermal electromotive force signals sent by multiple data transmission units 121. When multiple data receiving units 122 are provided simultaneously, the multiple data receiving units 122 can respectively receive the thermal electromotive force signals sent by different data transmission units 121 and respectively transmit the thermal electromotive force signals sent by different data transmission units 121 to the temperature display module 130.

[0043] In some embodiments of the present application, the thermocouple 110 can be fixed inside the housing of the target battery 200 by insulating glue. For example, the thermocouple 110 can be adhered to at least one of the positive electrode, negative electrode, and surface of the core in the housing of the target battery 200 by insulating glue. This insulating glue needs to have the characteristics of high temperature resistance and corrosion resistance to adapt to the electrolyte environment inside the housing of the target battery 200. Using insulating glue to fix the thermocouple 110 can avoid adding an additional structure for fixing the thermocouple 110 inside the housing of the target battery 200, thereby reducing the hardware cost when measuring the internal temperature of the battery.

[0044] Moreover, using insulating glue to fix the thermocouple 110 can also make the recycling of the thermocouple 110 more convenient. Specifically, since the internal battery temperature measuring device 100 is used in the charge and discharge test stage before the target battery 200 leaves the factory, after the charge and discharge test of the target battery 200 is completed, the target battery 200 needs to go through the next process or leave the factory. At this time, the internal battery temperature measuring device 100 is no longer needed for the target battery 200. Therefore, the thermocouple 110 can be removed from the target battery 200 for measuring the internal battery temperature of the next battery, realizing the recycling of the thermocouple 110. It can be seen that using insulating glue to fix the thermocouple 110 can make it more convenient to remove the thermocouple 110 from the target battery 200.

[0045] Similar to the fixing method of the thermocouple 110, the data sending unit 121 can also be fixed inside the housing of the target battery 200 by insulating glue. For example, the data sending unit 121 can be fixed on the inner surface of the housing of the target battery 200 by insulating glue, thereby reducing the hardware cost when measuring the internal battery temperature and making the recycling of the data sending unit 121 more convenient.

[0046] In some embodiments of the present application, the internal battery temperature measuring device 100 further includes an insulating glue cleaning module, and a preset organic solvent is stored in the insulating glue cleaning module. The preset organic solvent is, for example, a solvent such as ethylene glycol. The preset organic solvent is used to clean the residual insulating glue on the surface of the thermocouple 110 and / or the data sending unit 121 after the thermocouple 110 and / or the data sending unit 121 are removed from the target battery 200, so as to prevent the residual insulating glue from affecting the measurement of the internal battery temperature of the next battery by the thermocouple 110 and / or the data sending unit 121.

[0047] In some embodiments of the present application, the insulating glue cleaning module may include a liquid storage container and a cleaning head. The liquid storage container is used to store the preset organic solvent, and the cleaning head is used to suck and spray the preset organic solvent from the liquid storage container. In this way, by moving the removed thermocouple 110 and / or the data sending unit 121 in front of the cleaning head, the surface of the thermocouple 110 and / or the data sending unit 121 can be cleaned with the preset organic solvent sprayed by the cleaning head, making the cleaning of the thermocouple 110 and / or the data sending unit 121 more convenient.

[0048] In some embodiments of the present application, the thermocouple 110 may be a type B thermocouple or a type S thermocouple. The type B thermocouple refers to a platinum-rhodium 30-platinum-rhodium 6 (type B) thermocouple. The chemical composition of the positive electrode of this thermocouple is a platinum-rhodium alloy, in which the rhodium content is 30% and the platinum content is 70%. The chemical composition of the negative electrode is also a platinum-rhodium alloy, in which the rhodium content is 6% and the platinum content is 94%. Therefore, it is also called a double platinum-rhodium thermocouple. The type B thermocouple has the advantages of the highest accuracy, the best stability, a wide temperature measurement range, a long service life, and a high temperature measurement upper limit in the thermocouple series.

[0049] The type S thermocouple refers to a platinum-rhodium 10-platinum (type S) thermocouple. The chemical composition of the positive electrode of this thermocouple is a platinum-rhodium alloy, in which the rhodium content is 10% and the platinum content is 90%. The chemical composition of the negative electrode is pure platinum. Therefore, it is also called a single platinum-rhodium thermocouple. The type S thermocouple has good physical and chemical properties, good thermoelectromotive force stability and oxidation resistance at high temperatures, and is suitable for oxidizing and inert atmospheres.

[0050] In some embodiments of the present application, an anti-corrosion coating is provided on the surface of the thermocouple 110 to prevent the thermocouple 110 from being corroded by the electrolyte inside the housing of the target battery 200. Similarly, an anti-corrosion coating may also be provided on the surface of the data sending unit 121 to prevent the data sending unit 121 from being corroded by the electrolyte inside the housing of the target battery 200. The material of the anti-corrosion coating may be, for example, PPS (Polyphenylene sulfide) coating, PPA (Polyphthalamide) coating, Teflon, etc., which is not limited herein.

[0051] In some embodiments of the present application, the usage process of the battery internal temperature measuring device 100 is described by way of example. Specifically, before the charge and discharge test of the target battery 200, that is, during the production process of the target battery 200, the thermocouple 110 and the data sending unit 121 connected to the data output end of the thermocouple 110 are fixed inside the housing of the target battery 200 using insulating glue, and then the housing of the target battery 200 is sealed to obtain the target battery 200 that has been produced.

[0052] In the target battery 200 after production is completed, the measuring device 100 for the internal temperature of the battery is tested to ensure that the thermal electromotive force signal of the thermocouple 110 can be normally sent to the temperature display module 130 and the corresponding temperature can be normally displayed on the display screen of the temperature display module 130. Then, a charge and discharge test is performed on the target battery 200. At this time, the current internal temperature of the target battery 200 can be displayed on the display screen of the temperature display module 130. The tester can determine whether the temperature of the target battery 200 is too high or too low during the charge and discharge test based on the current internal temperature of the target battery 200 displayed on the display screen, so as to confirm whether the target battery 200 is charging and discharging safely.

[0053] After confirming that the target battery 200 can be charged and discharged safely, the target battery 200 can be disassembled, and the thermocouple 110 and the data sending unit 121 inside the housing of the target battery 200 are taken out. After the thermocouple 110 and the data sending unit 121 are taken out, the target battery 200 is assembled and sealed for the next process or factory shipment of the target battery 200. The taken-out thermocouple 110 and data sending unit 121 are cleaned by a preset organic solvent sprayed by the cleaning head of the insulating glue cleaning module, and the residual insulating glue on the surfaces of the thermocouple 110 and the data sending unit 121 is removed. At this time, it can be waited to fix the thermocouple 110 and the data sending unit 121 inside the housing of the next battery to measure the internal temperature of the next battery.

[0054] It can be seen that by using the measuring device 100 for the internal temperature of the battery, the internal temperature of the battery can be accurately measured, making the charge and discharge test of the battery safer. Moreover, compared with the method of leading out the temperature sensing wire connected to the thermocouple from the inside of the battery to utilize the temperature feedback collected by the temperature sensing wire, this method of transmitting temperature by wireless communication is more convenient and flexible, and avoids the problem of poor battery sealing, improving the safety of the battery during the charge and discharge test.

[0055] In some embodiments of the present application, please refer to Figure 5 , a measuring system 10 for the internal temperature of the battery is further provided. The measuring system 10 for the internal temperature of the battery includes the measuring device 100 for the internal temperature of the battery in any of the above embodiments and the target battery 200. The target battery 200 can specifically be a battery in the form of a square, a cylinder, etc. That is, the measuring device 100 for the internal temperature of the battery in the above embodiments is applicable to square batteries, cylindrical batteries, etc.

[0056] The above has introduced the embodiments of the present utility model in detail. Specific examples are used in this article to expound the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the structure and its core idea of the present utility model; at the same time, for those skilled in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A device for measuring the internal temperature of a battery, characterized in that: The battery internal temperature measuring device comprises: a thermocouple disposed inside a housing of the target battery; A wireless communication module, comprising a data sending unit and a data receiving unit connected by wireless communication, wherein the data sending unit is arranged inside the housing of the target battery and connected to the data output end of the thermocouple, and the data receiving unit is arranged in the external environment of the target battery; The temperature display module is connected to the data output terminal of the data receiving unit.

2. The device for measuring the internal temperature of a battery according to claim 1, characterized in that: The battery internal temperature measuring device includes a plurality of the thermocouples, and the plurality of the thermocouples are respectively arranged at different positions inside the shell of the target battery.

3. The device for measuring the internal temperature of a battery according to claim 2, characterized in that: At least one of the thermocouples is disposed at at least one position of the positive electrode, the negative electrode, and the surface of the winding core inside the shell of the target battery.

4. The device for measuring the internal temperature of a battery according to claim 2, characterized in that: The data output terminals of the plurality of thermocouples are connected to the same data sending unit.

5. The device for measuring the internal temperature of a battery according to claim 1, characterized in that: The thermocouple is fixed inside the housing of the target battery by means of insulating glue.

6. The device for measuring the internal temperature of a battery according to claim 5, characterized in that: The battery internal temperature measuring device further comprises an insulating glue cleaning module, wherein a preset organic solvent is stored in the insulating glue cleaning module.

7. The battery internal temperature measuring device according to any one of claims 1 to 6, characterized in that: The thermocouple is a B-type thermocouple or an S-type thermocouple.

8. The device for measuring the internal temperature of a battery according to any one of claims 1 to 6, characterized in that: The surface of the thermocouple is provided with an anti-corrosion coating.

9. A battery internal temperature measurement system, characterized in that: The battery internal temperature measurement system comprises the battery internal temperature measurement device according to any one of claims 1 to 8 and a target battery.

10. The battery internal temperature measurement system according to claim 9, characterized in that: The target battery is a square battery or a cylindrical battery.

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