Device and method for testing pressure contact battery

Abstract

The invention relates to a testing device and method for a pressure contact battery, and belongs to the technical field of batteries, and the testing device comprises an internal battery testing mold which is used for placing a to-be-tested battery and providing continuous pressure for the to-be-tested battery; the atmosphere protection system is arranged outside the battery test mold and is used for isolating external oxygen and maintaining an inert atmosphere; the temperature compensation assembly is arranged between the battery test mold and the atmosphere protection system, and helps the to-be-tested battery to rapidly reach a preset working temperature by providing extra heat; and the temperature sensing assembly monitors the temperature of the to-be-tested testing device in real time. According to the invention, effective pressurization, heating and current conduction of the solid-state battery piece can be realized, a required test temperature field can be effectively and rapidly activated, and continuous pressure and a corresponding required inert atmosphere can be provided during testing.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a testing device and method for a pressure contact battery. Background Art

[0002] A pressure contact battery refers to a battery in which the current collector, electrode and electrolyte are connected together by external force to achieve conductivity, such as lithium thermal batteries, anion all-solid-state batteries, etc.

[0003] Document 1 (Muthu P, Rajagopal S, Saju D, et al. Review of Transition Metal Chalcogenides and Halides as Electrode Materials for Thermal Batteries and Secondary Energy Storage Systems. [J]. ACS omega, 2024, 9 (7): 7357-7374.) discloses a lithium thermal battery, which is a primary battery with a metal salt as a positive electrode, a metal lithium boron alloy as a negative electrode, and an inorganic molten salt as an electrolyte. At room temperature, the electrolyte solidifies and puts it in an open circuit state, ensuring that it can be stored safely for more than 25 years; under high temperature activation, the electrolyte melts and has high ionic conductivity, which is more than ten times that of organic electrolytes of lithium ion batteries, enabling the battery to discharge with large current and large pulses, adapt to extremely harsh working conditions, and can discharge normally in extreme temperature environments and mechanical environments. This battery is widely used in emergency equipment, weapon systems, long-term unmanned platforms, aerospace, fire alarms and other fields.

[0004] Document 2 (Thieu TD, Fawey HM, Bhatia H, et al. CuF2 as Reversible Cathode for Fluoride Ion Batteries [J]. Advanced Functional Materials, 2017, 27 (31): n / an / a.) discloses an anion all-solid-state battery, in which the positive electrode is composed of a metal salt powder, the negative electrode is composed of a mixture powder of magnesium, calcium, bismuth, lead, etc. and their respective small amounts of salts, and the solid inorganic salt is the electrolyte.

[0005] The conduction of the above-mentioned battery depends entirely on pressure.

[0006] However, the current testing of pressure contact batteries faces several technical challenges. The first is that the test requires the rapid acquisition of the temperature field to shorten the activation time. Taking lithium thermal batteries as an example, this type of pressure contact battery usually works at 400°C or even 550°C. During operation, the electrolyte is in a molten state, and the active metal of the negative electrode is prone to physical and chemical reactions and dissolves into the electrolyte. Therefore, it is necessary to quickly reach the test temperature for measurement to avoid serious damage to the battery structure; the second is to maintain the battery conduction pressure. The conduction of the pressure contact battery relies on external force, and the continuous maintenance of the external force is the guarantee for the normal operation of the battery. The third is that inert environmental protection is required. The negative electrode of this type of battery is usually an active metal. Since external oxygen may trigger an oxidation reaction of the battery material, the test system must have excellent airtightness to ensure that the test environment is isolated from the outside world and maintain a stable inert atmosphere. In summary, the pressure contact battery test system needs to be precisely designed and optimized in terms of high temperature resistance, temperature monitoring, rapid heat conduction, pressure control, airtightness and environmental isolation to ensure the accuracy of the test results and the guarantee of battery safety.

[0007] However, in the prior art, for example, the traditional all-solid-state battery molds disclosed in Document 3 Chinese Patent (Publication No.: CN219434863U, Publication Date: July 28, 2023), Document 4 Chinese Patent (Publication No.: CN217278831U, Publication Date: August 23, 2022), and Document 5 Chinese Patent (Publication No.: CN218350460U, Publication Date: January 20, 2023) cannot provide sufficient pressure changes during battery testing due to the lack of a combined spring mechanism when the battery body undergoes an electrochemical reaction that causes a volume change. At the same time, the device lacks the necessary temperature sensing components, cannot monitor the battery operating temperature environment in real time, and has a certain temperature hysteresis. For example, the high-temperature resistant Swagelok-type battery molds disclosed in Document 6 (publication number: CN219085098U, publication date: May 26, 2023) and Document 7 (publication number: CN218584959U, publication date: March 7, 2023) provide a combined spring mechanism, but due to defects in their design and materials, they can only meet the test at 320°C and cannot provide the test temperature environment required for pressure contact batteries. The slow heating rate cannot make the battery quickly reach the predetermined operating temperature, and there is a long shelf period. Summary of the invention

[0008] In view of the shortcomings of the prior art, the present invention provides a testing device and method for pressure contact batteries, which can achieve effective pressurization, heating and current conduction of solid-state battery cells, can effectively and quickly activate the required test temperature field, and provide continuous pressure and the corresponding required inert atmosphere during testing.

[0009] A pressure contact battery testing device, comprising:

[0010] The internal battery test mold is used to place the battery to be tested and provide it with continuous pressure;

[0011] The atmosphere protection system is installed outside the battery test mold to isolate external oxygen and maintain an inert atmosphere;

[0012] The temperature compensation component is set between the battery test mold and the atmosphere protection system to help the battery under test quickly reach the predetermined operating temperature by providing additional heat;

[0013] The temperature sensing component monitors and displays the temperature of the battery under test in real time.

[0014] The temperature compensation assembly includes a heating collar built between the battery test mold and the atmosphere protection system.

[0015] The battery testing mold includes an external pressurizing component and an internal pressure conducting component, and a mica tube is provided in the inner cavity of the pressurizing component for insulation.

[0016] The pressurizing assembly is used to provide pressure, and includes a metal piece arranged at the outermost part. A plurality of metal pieces are threadedly connected in sequence from top to bottom, and a flat washer is arranged between every two adjacent metal pieces.

[0017] The pressure transmission component transfers the pressure provided by the pressurizing component to the positive and negative plates and the electrolyte of the battery to be tested and continuously applies pressure during the test process. Specifically, it includes a T-shaped cylindrical metal part and a spring placed inside the pressurizing component, specifically including an upper T-shaped cylindrical metal part and a lower T-shaped cylindrical metal part arranged back to back. In the test state, the battery to be tested is placed between the upper T-shaped cylindrical metal part and the lower T-shaped cylindrical metal part; a spring is arranged between the upper T-shaped cylindrical metal part and the battery to be tested; the threaded column parts of the upper T-shaped cylindrical metal part and the lower T-shaped cylindrical metal part are respectively connected to a copper nose and one of its derivatives, and are fixed with nuts to respectively achieve connection with the negative and positive electrodes to be tested.

[0018] During the electrical performance test, the ends of the negative electrode and the positive electrode are connected to an electrochemical workstation, which is used to record the electrochemical data of the battery discharge process and perform real-time performance analysis.

[0019] The metal piece, the flat washer, the upper T-shaped cylindrical metal piece and the lower T-shaped cylindrical metal piece are all made of 316 stainless steel.

[0020] On the threaded column of the lower T-shaped cylindrical metal part, the part located inside the battery testing mold is sleeved with an upper corundum tube on the outside, and the upper corundum tube is arranged between the bottom of the circular base of the lower T-shaped cylindrical metal part and the flat washer; on the threaded column of the lower T-shaped cylindrical metal part, the part located outside the battery testing mold is sleeved with a lower corundum tube on the outside, and is located below the lower flat washer; the threaded column part of the lower T-shaped cylindrical metal part is covered with a sleeve glass fiber 14 for insulation.

[0021] The atmosphere protection system includes an atmosphere protection device, which includes an atmosphere protection cover and a cover. The outer wall of the atmosphere protection cover is made of quartz glass, and the cover and the flange used for sealing the atmosphere protection cover are made of 316 stainless steel. The atmosphere protection cover is provided with an inert gas input port A and an inert gas output port B, which are used to replace oxygen inside the atmosphere protection device with inert gas.

[0022] A test method for a pressure contact battery, using the above-mentioned test device for a pressure contact battery, is as follows:

[0023] Sa: Battery assembly to be tested:

[0024] Sb: Environmental sealing: Place the assembled battery test mold into the atmosphere protection system and use inert gas to replace oxygen to form a closed test environment;

[0025] Sc: Temperature display: Displays the temperature of the test device through the temperature sensing component;

[0026] Sd: Temperature compensation: The test device is preheated to below the melting point of the electrolyte through the temperature compensation component;

[0027] Se: Temperature field control: Place the assembled test device into a temperature field that meets the test requirements. The temperature sensing component displays the test temperature and starts the test after it stabilizes for 10 seconds.

[0028] Sf: Electrical performance test: discharge test in constant current or constant power mode;

[0029] Sg: Data acquisition and analysis: Use an external electrochemical workstation to collect electrochemical data and analyze battery performance;

[0030] Sh: Post-test processing: After the test is completed, the test device is cooled to room temperature, the battery test mold is disassembled, and the battery samples after the test are subsequently analyzed.

[0031] By means of the above technical solution, the present invention has at least the following beneficial effects:

[0032] The present invention is provided by

[0033] 1. The present invention is provided with a temperature compensation component, which greatly speeds up the acquisition of the test temperature field, and the temperature required for battery testing can be reached within 20 seconds; at the same time, a temperature sensing component is provided to provide the temperature of the device during testing, so that the battery can be quickly heated to the required discharge temperature, and the temperature change can be accurately controlled while the battery temperature is monitored in real time, ensuring that the battery is tested within a stable temperature range, thereby improving the test efficiency and accuracy and reducing the error caused by temperature fluctuations.

[0034] 2. The present invention can not only meet the battery testing requirements at room temperature, but also stably and accurately test battery performance at high temperatures exceeding 500°C. During the high-temperature discharge test, the device can apply sufficient pressure to ensure close contact between the battery components and the electrodes; and effectively isolate the influence of external oxygen on the battery materials to prevent oxidation of the battery materials, thereby improving the accuracy and reliability of the test.

[0035] 3. The present invention can ensure temperature stability, significantly improve the safety and reliability during the test process, solve the technical bottleneck of traditional test systems in room temperature or even high temperature environments, and provide a more stable and efficient test platform for the research and development and application of pressure contact batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the internal structure of a pressure contact battery testing device provided by the present invention;

[0037] Figure 2 A schematic diagram of a heating collar built into a pressure contact battery testing device provided by the present invention;

[0038] Figure 3 A schematic diagram of a battery testing mold in a pressure contact battery testing device provided by the present invention;

[0039] Figure 4 A front view of a battery testing mold in a pressure contact battery testing device provided by the present invention;

[0040] Figure 5 A top view of a battery testing mold in a pressure contact battery testing device provided by the present invention;

[0041] Figure 6 An exploded view of a battery test mold in a test device for a pressure-contact battery provided by the present invention;

[0042] Figure 7 It is the test result curve diagram of Example 6;

[0043] Figure 8 It is the test result curve diagram of Example 7;

[0044] Fig. 9 It is the test result curve diagram of Example 8;

[0045] Fig.10 It is the test result curve diagram of Example 9;

[0046] Fig.11 It is the test result curve diagram of Example 10;

[0047] Fig.12 is a test result curve diagram of Example 11;

[0048] in:

[0049] 1-upper hollow external threaded metal part, 2-middle hollow internal threaded metal part, 3-lower hollow external threaded metal part, 4-upper nut, 5-upper T-shaped cylindrical metal part, 6-lower T-shaped cylindrical metal part, 7-upper corundum tube, 8-lower flat washer, 9-upper flat washer, 10-lower corundum tube, 11-lower nut, 12-mica tube, 13-spring, 14-sleeve glass fiber, 15-thermocouple, 16-heating collar, 17-battery test mold, 18-atmosphere protection device, 19-battery to be tested. DETAILED DESCRIPTION

[0050] In order to better explain the present invention and facilitate understanding, the technical solutions and effects of the present invention are described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0051] like Figure 1-6 As shown, a pressure contact battery testing device includes an internal battery testing mold 17 and an external atmosphere protection system, wherein a temperature compensation component is arranged between the battery testing mold 17 and the atmosphere protection system; and also includes a temperature sensing component, wherein the temperature sensing component includes a thermocouple 15 built into the battery testing mold 17 and in contact with a battery to be tested 19 and extending outside the atmosphere protection system, and an external temperature control meter (not shown in the figure), which monitors the actual temperature of the battery to be tested 19 in real time, and displays the real-time temperature through the temperature control meter external to the thermocouple 15, thereby adjusting the heating temperature and discharge environment at any time.

[0052] The temperature compensation assembly includes a heating collar 16 built between the battery test mold 17 and the atmosphere protection system, which provides additional heat to help the battery 19 to be tested quickly reach a predetermined operating temperature. The heating collar 16 adjusts the temperature in real time through the temperature control system to ensure that the test environment temperature is uniform and stable.

[0053] The battery testing mold 17 includes an external pressurizing component, which is used to provide pressure, including a metal part arranged on the outermost side, specifically including an upper hollow externally threaded metal part 1, a middle hollow internally threaded metal part 2 and a lower hollow externally threaded metal part 3 which are threadedly connected in sequence from top to bottom; an upper flat washer 9 is arranged between the upper hollow externally threaded metal part 1 and the middle hollow internally threaded metal part 2; a lower flat washer 8 is arranged between the middle hollow internally threaded metal part 2 and the lower hollow externally threaded metal part 3.

[0054] The inner cavity of the central hollow internally threaded metal part 2 is provided with a mica tube 12 for isolating the conductive component from the metal shell to achieve insulation.

[0055] The pressure-transmitting component is provided inside the pressurizing component, and the pressure provided by the pressurizing component is transmitted to the positive and negative electrodes and the electrolyte of the battery 19 to be tested, and conducts electricity through surface-to-surface contact. The pressure-transmitting component includes a T-shaped cylindrical metal piece and a spring 13 placed inside the mica tube 12, and an upper T-shaped cylindrical metal piece 5 and a lower T-shaped cylindrical metal piece 6 are arranged axially up and down opposite to each other inside the mica tube 12. In the test state, the battery 19 to be tested is placed between the upper T-shaped cylindrical metal piece 5 and the lower T-shaped cylindrical metal piece 6, and a spring 13 is arranged between the upper T-shaped cylindrical metal piece 5 and the battery 19 to be tested. The threaded column of the upper T-shaped cylindrical metal piece 5 is arranged outward, passes through the upper flat washer 9 and extends to the outside of the battery test mold 17 and is locked by the upper nut 4; the threaded column of the lower T-shaped cylindrical metal piece 6 passes through the lower flat washer 8 and extends to the outside of the battery test mold 17 and is locked by the lower nut 11. During the charge and discharge process, the battery will inevitably expand in volume. The upper T-shaped cylindrical metal part 5 applies pressure to the spring 13. The spring 13 automatically stretches and compresses according to the expansion and contraction of the battery, and continuously applies pressure to the battery, thereby enabling the pressure transmission component to continuously apply pressure during the battery test to compensate for the contact failure caused by the volume change of the battery material.

[0056] The threaded column of the upper T-shaped cylindrical metal piece 5 is matched with the nut to fix the upper T-shaped cylindrical metal piece 5 and the upper flat washer 9 .

[0057] The threaded column parts of the upper T-shaped cylindrical metal part 5 and the lower T-shaped cylindrical metal part 6 are respectively connected to a copper nose and a derivative thereof, and fixed with nuts to respectively achieve connection with the negative electrode and the positive electrode under test; the ends of the negative electrode and the positive electrode under test are externally connected to an electrochemical workstation. During the electrical performance test, the external electrochemical workstation is used to record the electrochemical data of the battery discharge process and perform real-time analysis of the performance.

[0058] The materials of the middle hollow internal threaded metal part 2, the upper hollow external threaded metal part 1, the lower hollow external threaded metal part 3, the upper flat washer 9, the lower flat washer 8, the upper T-shaped cylindrical metal part 5 and the lower T-shaped cylindrical metal part 6 are all 316 stainless steel to ensure the mechanical strength and corrosion resistance of the device in a high temperature environment.

[0059] On the threaded column of the lower T-shaped cylindrical metal part 6, the part located inside the battery testing mold 17 is sleeved with an upper corundum tube 7 on the outside, and the upper corundum tube 7 is arranged between the bottom of the circular base of the lower T-shaped cylindrical metal part 6 and the flat washer; on the threaded column of the lower T-shaped cylindrical metal part 6, the part located outside the battery testing mold 17 is sleeved with a lower corundum tube 10 on the outside, which is located below the lower flat washer 8 and fixed with a nut.

[0060] The threaded column portion of the lower T-shaped cylindrical metal member 6 is covered with a sleeve glass fiber 14 to isolate the conductive parts for insulation.

[0061] The mica tube 12, the upper corundum tube 7, the lower corundum tube 10 and the sleeve glass fiber 14 constitute the insulating components of the entire battery test mold 17, ensuring electrical isolation, effectively isolating the conductive path and preventing short circuit.

[0062] The atmosphere protection system includes an atmosphere protection device 18, which is used to isolate external oxygen and maintain an inert atmosphere. The atmosphere protection device 18 includes an atmosphere protection cover and a lid. The outer wall of the atmosphere protection cover is made of quartz glass, and the lid and the flange used for sealing the atmosphere protection cover are made of 316 stainless steel to ensure the airtightness and stability of the test environment. The atmosphere protection cover is provided with an inert gas input port A and an inert gas output port B, which are used to replace the oxygen inside the atmosphere protection device 18 with inert gas, isolate external oxygen, and form a sealed test environment to prevent oxidation of battery materials. The inert gas is argon or nitrogen.

[0063] The method for testing using the above-mentioned pressure contact battery testing device is as follows:

[0064] Sa: Assembling the battery 19 to be tested: placing the positive electrode sheet, electrolyte, negative electrode sheet of the battery 19 to be tested or the negative electrode sheet, electrolyte, positive electrode sheet of the battery 19 to be tested in the battery test mold 17 in sequence, and applying pressure through the pressurizing assembly to ensure close contact between the layers of the battery sheet and close contact between the positive and negative electrode sheets and the conductive current collector;

[0065] Sb: Environmental sealing: placing the battery test mold 17 into an atmosphere protection system and using inert gas to replace oxygen to form a closed test environment;

[0066] Sc: Temperature display: Displays the actual temperature of the battery 19 to be tested through the temperature sensing component;

[0067] Sd: Temperature compensation: The test device is preheated to below the melting point of the electrolyte through the temperature compensation component;

[0068] Se: Temperature field control: Place the assembled test device into a temperature field that meets the test requirements. The temperature sensing component displays the test temperature and starts the test after it stabilizes for 10 seconds.

[0069] Sf: Electrical performance test: Perform a discharge test in a constant current or constant power mode, and record the voltage, current and energy output of the battery 19 to be tested;

[0070] Sg: Data acquisition and analysis: Use an external electrochemical workstation to collect electrochemical data and analyze battery performance, including specific capacity, specific energy and cycle performance;

[0071] Sh: Post-test processing: After the test is completed, the test device is cooled to room temperature, the battery test mold 17 is disassembled, and the battery samples after the test are subsequently analyzed.

[0072] The above device can be used to test the battery 19 to be a lithium thermal battery composed of a metal fluoride CuF2, FeF3 or NiF2 as a positive electrode material, an inorganic molten salt LiF-NaF-KF-MgO or LiF-LiBr-LiCl-MgO as an electrolyte, and a lithium-boron alloy as a negative electrode.

[0073] Example 1

[0074] The battery test is performed using the pressure contact battery test device. In this embodiment, the battery 19 to be tested is a lithium thermal battery assembled using metal fluoride CuF2 as the positive electrode material, lithium boron alloy as the negative electrode, and inorganic molten salt LiF-NaF-KF-MgO as the electrolyte.

[0075] During the test, the lithium-boron alloy negative electrode, LiF-NaF-KF-MgO electrolyte powder, and CuF2 positive electrode powder are sequentially filled into the mica tube 12 of the battery test mold 17, the test device is assembled, and the assembled battery test mold 17 is placed in the atmosphere protection system for electrochemical testing. The test temperature is 500°C, at 500°C, 0.3Ag -1 The discharge performance of the battery was tested at a current density of .

[0076] Example 2

[0077] The same device as in Example 1 was used for testing. The only difference between this example and Example 1 is that the current density is 0.4A. -1 The remaining structures, parameter settings and test method steps are exactly the same as those in Example 1.

[0078] Example 3

[0079] The same device as in Example 1 was used for testing. The only difference between this example and Example 1 is that the current density is 0.5A. -1 The remaining structures, parameter settings and test method steps are exactly the same as those in Example 1.

[0080] Example 4

[0081] The same device as in Example 1 was used for testing. The only difference between this example and Example 1 is that the current density is 0.6A. -1 The remaining structures, parameter settings and test method steps are exactly the same as those in Example 1.

[0082] Example 5

[0083] The same device as in Example 1 was used for testing. The only difference between this example and Example 1 is that the current density is 0.9A. -1 The remaining structures, parameter settings and test method steps are exactly the same as those in Example 1.

[0084] The test results of Examples 1 to 5 are shown in Table 1 below:

[0085] Table 1

[0086]

[0087] Example 6

[0088] The same device as in Example 1 was used for testing. The only difference between this embodiment and Example 1 is that the test temperature is 550°C. The rest of the structure and parameter settings and the test method steps are exactly the same as in Example 1. The test results are shown in FIG. Figure 7 shown.

[0089] Example 7

[0090] The same device as in Example 1 was used for testing. The only difference between this embodiment and Example 1 is that the test temperature is 600°C. The rest of the structure and parameter settings and the test method steps are exactly the same as those in Example 1. The test results are shown in FIG. Figure 8 shown.

[0091] Example 8

[0092] The same device as in Example 1 was used for testing. The only difference between this embodiment and Example 1 is that the positive electrode material is metal fluoride FeF3. The rest of the structure and parameter settings and the test method steps are exactly the same as those in Example 1. The test results are shown in FIG. Fig. 9 shown.

[0093] Example 9

[0094] The same device as in Example 1 was used for testing. The only difference between this embodiment and Example 1 is that the positive electrode material is metal fluoride NiF2. The rest of the structure and parameter settings and the test method steps are exactly the same as in Example 1. The test results are shown in FIG. Fig.10 shown.

[0095] Example 10

[0096] The same device as in Example 1 was used for testing. The only difference between this embodiment and Example 1 is that the positive electrode material is LiFePO4. The rest of the structure and parameter settings and the test method steps are exactly the same as in Example 1. The test results are shown in FIG. Fig.11 shown.

[0097] The above device can also be used to test the battery 19 to be tested. The battery 19 is selected from a metal fluoride CuF2, FeF3 or NiF2 as the positive electrode material, a Mg, Ca, Bi or Pb and their corresponding salt mixture powder as the negative electrode material, and a fluorine cerite type fluoride La 0.9 Ba 0.1 F 2.9 , lead-containing tin fluoride PbSnF4, lead-containing tin fluoride BaSnF4, fluorite-type fluoride Ba 0.7 Sb 0.3 F 2.3 Or fluorite fluoride CsPb 0.9 K 0.1 F 2.9 One of them is a solid-state anion battery assembled with an electrolyte, wherein the negative electrode material is a composite material formed by mixing Mg, Ca, Bi or Pb metals and their corresponding salt mixtures in a mass ratio of 5:3, and the mass is 0.27g-0.3g.

[0098] Embodiment 11

[0099] The test was carried out using the same device as in Example 1. In this embodiment, the battery 19 to be tested is a battery that uses metal fluoride CuF2 as the positive electrode material, Pb and its corresponding salt mixture powder as the negative electrode material, and fluorite fluoride CsPb 0.9 K 0.1 F 2.9 Solid-state anion battery assembled with electrolyte.

[0100] During the test, the CuF2 positive electrode material and CsPb 0.9 K 0.1 F 2.9The electrolyte powder and the Pb negative electrode powder are sequentially filled into the mica tube 12 of the battery test mold 17, and the test device is assembled. The assembled battery test mold 17 is placed in the atmosphere protection system for electrochemical testing. The test temperature is room temperature. At room temperature and 3mAg -1 The discharge performance of the battery was tested at a current density of Fig.12 shown.

[0101] The above device can also be used to test the battery 19 to be tested, which is a lithium thermal battery assembled by selecting a metal sulfide FeS2 or NiS2 as the positive electrode material, a lithium boron alloy as the negative electrode material, and an inorganic molten salt LiF-NaF-KF-MgO as the electrolyte.

[0102] Example 12

[0103] The test was carried out using the same device as in Example 1. In this embodiment, the battery 19 to be tested is a lithium thermal battery assembled using FeS2 as the positive electrode material, lithium-boron alloy as the negative electrode material, and inorganic molten salt LiF-NaF-KF-MgO as the electrolyte.

[0104] During the test, the lithium-boron alloy negative electrode, LiF-NaF-KF-MgO electrolyte powder, and FeS2 positive electrode powder are filled into the mica tube 12 of the battery test mold 17 in sequence, the test device is assembled, and the assembled battery test mold 17 is placed in the atmosphere protection system for electrochemical testing.

[0105] The above device can also be used to test the battery 19 to be tested, which is a lithium thermal battery assembled by selecting a metal oxide CuO or V2O5 as the positive electrode material, a lithium boron alloy as the negative electrode material, and an inorganic molten salt LiF-NaF-KF-MgO as the electrolyte.

[0106] Embodiment 13

[0107] The test was performed using the same device as in Example 1. In this embodiment, the battery 19 to be tested is a lithium thermal battery assembled using CuO as the positive electrode material, lithium-boron alloy as the negative electrode material, and inorganic molten salt LiF-NaF-KF-MgO as the electrolyte.

[0108] During the test, the lithium-boron alloy negative electrode, LiF-NaF-KF-MgO electrolyte powder, and CuO positive electrode powder are filled into the mica tube 12 of the battery test mold 17 in sequence, the test device is assembled, and the assembled battery test mold 17 is placed in the atmosphere protection system for electrochemical testing.

[0109] The above device can also be used to test that the battery 19 to be tested is a lithium thermal battery assembled by selecting a metal chloride NiCl or PbCl2 as the positive electrode material, a lithium boron alloy as the negative electrode material, and an inorganic molten salt LiF-NaF-KF-MgO as the electrolyte.

[0110] Embodiment 14

[0111] The test was performed using the same device as in Example 1. In this embodiment, the battery 19 to be tested is a lithium thermal battery assembled using NiCl as the positive electrode material, lithium boron alloy as the negative electrode material, and inorganic molten salt LiF-NaF-KF-MgO as the electrolyte.

[0112] During the test, the lithium-boron alloy negative electrode, LiF-NaF-KF-MgO electrolyte powder, and NiCl positive electrode powder are filled into the mica tube 12 of the battery test mold 17 in sequence, the test device is assembled, and the assembled battery test mold 17 is placed in the atmosphere protection system for electrochemical testing.

Claims

1. A pressure contact battery testing device, characterized in that: include: An internal battery test mold (17) for placing the battery to be tested (19) and providing continuous pressure thereto; An atmosphere protection system is arranged outside the battery test mold (17) to isolate external oxygen and maintain an inert atmosphere; A temperature compensation component is arranged between the battery test mold (17) and the atmosphere protection system, and helps the battery to be tested (19) to quickly reach a predetermined operating temperature by providing additional heat; The temperature sensing component monitors the temperature of the battery to be tested (19) in real time and displays it.

2. A pressure contact battery testing device according to claim 1, characterized in that: The temperature compensation component comprises a heating collar (16) built between the battery test mold (17) and the atmosphere protection system.

3. A pressure contact battery testing device according to claim 1, characterized in that: The battery test mold (17) comprises an external pressurizing component and an internal pressure conducting component, and the inner cavity of the pressurizing component is provided with a mica tube (12) for insulation.

4. A pressure contact battery testing device according to claim 3, characterized in that: The pressurizing assembly is used to provide pressure, and includes a metal piece arranged at the outermost part. A plurality of metal pieces are threadedly connected in sequence from top to bottom, and a flat washer is arranged between every two adjacent metal pieces.

5. A pressure contact battery testing device according to claim 3, characterized in that: The pressure transmission component transmits the pressure provided by the pressurizing component to the positive and negative electrodes and the electrolyte of the battery (19) to be tested and continuously applies pressure during the test process. Specifically, it includes a T-shaped cylindrical metal piece and a spring (13) placed inside the pressurizing component, and specifically includes an upper T-shaped cylindrical metal piece (5) and a lower T-shaped cylindrical metal piece (6) arranged in opposite directions. In the test state, the battery (19) to be tested is placed between the upper T-shaped cylindrical metal piece (5) and the lower T-shaped cylindrical metal piece (6); a spring (13) is arranged between the upper T-shaped cylindrical metal piece (5) and the battery (19) to be tested; the threaded column parts of the upper T-shaped cylindrical metal piece (5) and the lower T-shaped cylindrical metal piece (6) are respectively connected to a copper nose and a derivative thereof, and fixed with a nut to respectively achieve connection with the negative electrode and the positive electrode to be tested.

6. A pressure contact battery testing device according to claim 5, characterized in that: During the electrical performance test, the ends of the negative electrode and the positive electrode are connected to an electrochemical workstation, which is used to record the electrochemical data of the battery discharge process and perform real-time performance analysis.

7. A pressure contact battery testing device according to claim 4 or 5, characterized in that: The metal piece, the flat washer, the upper T-shaped cylindrical metal piece (5) and the lower T-shaped cylindrical metal piece (6) are all made of 316 stainless steel.

8. The pressure contact battery testing device according to claim 5, characterized in that: The threaded column of the lower T-shaped cylindrical metal part (6) is located inside the battery test mold (17), and an upper corundum tube (7) is sleeved on the outside. The upper corundum tube (7) is arranged between the lower circular base of the lower T-shaped cylindrical metal part (6) and the flat washer; the threaded column of the lower T-shaped cylindrical metal part (6) is located outside the battery test mold (17), and a lower corundum tube (10) is sleeved on the outside, and is located below the lower flat washer (8); the threaded column part of the lower T-shaped cylindrical metal part (6) is covered with a sleeve glass fiber (14) for insulation.

9. A pressure contact battery testing device according to claim 1, characterized in that: The atmosphere protection system comprises an atmosphere protection device (18), the atmosphere protection device (18) comprises an atmosphere protection cover and a cover, the outer wall of the atmosphere protection cover is made of quartz glass, the cover and the flange for sealing the atmosphere protection cover are made of 316 stainless steel; the atmosphere protection cover is provided with an inert gas input port A and an inert gas output port B, which are used to replace oxygen inside the atmosphere protection device (18) with inert gas.

10. A method for testing a pressure contact battery, using a pressure contact battery testing device according to any one of claims 1 to 9, characterized in that: The details are as follows: Sa: Assembling of the battery to be tested (19): Sb: Environmental sealing: placing the assembled battery test mold (17) into an atmosphere protection system and using inert gas to replace oxygen to form a closed test environment; Sc: Temperature display: Displays the temperature of the test device through the temperature sensing component; Sd: Temperature compensation: The test device is preheated to below the melting point of the electrolyte through the temperature compensation component; Se: Temperature field control: Place the assembled test device into a temperature field that meets the test requirements. The temperature sensing component displays the test temperature and starts the test after it stabilizes for 10 seconds. Sf: Electrical performance test: discharge test in constant current or constant power mode; Sg: Data acquisition and analysis: Use an external electrochemical workstation to collect electrochemical data and analyze battery performance; Sh: Post-test processing: After the test is completed, the test device is cooled to room temperature, the battery test mold (17) is disassembled, and the battery samples after the test are subsequently analyzed.

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