Test device for a sensor inside a battery

Abstract

The application discloses a testing device for a battery internal sensor, which comprises a sealed testing structure and an extension part fixedly connected with the sealed testing structure, wherein a pressure regulating bellows, an equal strength beam testing part and a sensor are arranged in the extension part, the testing device determines the pressure change of the testing device fixedly connected with the center bellows through the deformation of the center bellows, the pressure regulating bellows deforms correspondingly based on the pressure change of the testing device, so that the pressure in the sealed testing structure is maintained in a relatively constant range, a testing environment of electrolyte in which the battery internal sensor is in a constant vapor pressure is provided, and the pressure in the sealed testing structure is ensured to be constant.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a testing device for internal sensors of batteries. Background Technology

[0002] In related technologies, lithium hexafluorophosphate in lithium-ion battery electrolytes reacts with air to produce hydrofluoric acid and degrades, and the battery interior is also isolated from air. Therefore, the testing device needs to be air-isolated. Furthermore, implanted stress-strain sensors operate in two conditions depending on their installation location: immersed in a constant-temperature electrolyte and suspended in electrolyte vapor at a constant vapor pressure. Therefore, the testing device must be able to meet the testing requirements of both conditions simultaneously. Specifically, the simulated electrolyte vapor environment test needs to ensure that during sensor loading and unloading, the pressure inside the sealed test container with a movable sealing structure changes, affecting the electrolyte vapor pressure and making it difficult to maintain a constant vapor pressure within the container. Summary of the Invention

[0003] The purpose of this invention is to at least partially solve one of the aforementioned technical problems.

[0004] Therefore, the purpose of this invention is to provide a testing device for internal sensors of a battery.

[0005] To achieve the above objectives, the battery internal sensor testing device of the present invention includes: a sealed testing structure and an extension fixedly connected to the sealed testing structure, wherein the extension is provided with a pressure regulating bellows, an equal strength beam testing component, and a sensor, wherein the testing device determines the pressure change of the testing device fixedly connected to the central bellows by the deformation of the central bellows, and based on the pressure change of the testing device, the pressure regulating bellows undergoes corresponding deformation to maintain the pressure within the sealed testing structure within a relatively constant range, providing an electrolyte testing environment for simulating the battery internal sensor being under constant vapor pressure.

[0006] According to the battery internal sensor testing device of the present invention, the pressure change of the testing device can be determined by the deformation of the central bellows. When the pressure change of the testing device is determined, the pressure regulating bellows deforms. Then, based on the deformation of the pressure regulating bellows, it can be determined that the pressure inside the sealed testing structure can be maintained within a relatively constant range, thus ensuring that the pressure inside the sealed testing structure remains constant.

[0007] In one embodiment of the present invention, the central bellows is fixedly connected to a loading and unloading component. When the loading and unloading component moves up and down, it unloads and loads the sealing test structure respectively. Under the action of the loading and unloading component, the central bellows deforms and the pressure of the test device changes.

[0008] In one embodiment of the present invention, when the loading and unloading component moves downward, it is determined that the internal pressure of the sealing test structure increases, and the volume of the sealing test structure is increased and the internal pressure of the sealing test structure is reduced by the deformation of the pressure regulating bellows.

[0009] In one embodiment of the present invention, when the loading and unloading component moves upward, it is determined that the internal pressure of the sealing test structure decreases, and the volume of the sealing test structure is reduced and the internal pressure of the sealing test structure is increased by deforming the pressure regulating bellows.

[0010] In one embodiment of the present invention, the loading and unloading component includes a main body and a connecting part, the central corrugated pipe wraps the connecting part, the connecting part has a columnar structure, a load sensor is provided on the columnar structure, wherein the load sensor is connected to a roller loading head through a connector, and the connector has a threaded hole.

[0011] In one embodiment of the present invention, the equal strength beam testing component includes a cantilever beam and a body, wherein the body encloses the cantilever beam and the body is provided with electrode wire ends and dial indicator mounting holes.

[0012] In one embodiment of the present invention, one end of the cantilever beam is disposed at a preset position of the sealing test structure, wherein the direction of the cantilever beam and the connecting portion is always perpendicular.

[0013] In one embodiment of the present invention, one end of the cantilever beam is in contact with the roller loading head, wherein when the load sensor applies a load, the cantilever beam bends and deforms, and the roller loading head rolls autonomously according to the bending deformation of the cantilever beam.

[0014] In one embodiment of the present invention, the surface of the cantilever beam is provided with a stress-strain sensor.

[0015] In one embodiment of the present invention, the sensor includes a temperature sensor and a pressure sensor, wherein the probe of the temperature sensor is disposed below the electrolyte surface and the probe of the pressure sensor is disposed above the electrolyte surface.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0018] Figure 1This is a schematic diagram of a test device for a battery internal sensor according to an embodiment of the present invention;

[0019] Figure 2 This is a front view of a testing apparatus for an internal battery sensor according to an embodiment of the present invention;

[0020] Figure 3 This is a side view of a testing apparatus for an internal battery sensor according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the loading and unloading component according to an embodiment of the present invention.

[0022] Figure label:

[0023] 1. Testing device; 11. Sealing test structure; 12. Extension; 1201. First extension; 1202. Second extension; 1203. Third extension; 1204. Fourth extension; 13. Pressure regulating bellows; 14. Equal strength beam testing component; 141. Cantilever beam; 142. Body; 1421. Electrode wire end; 1422. Dial gauge mounting hole; 15. Sensor; 1501. Temperature sensor; 1502. Pressure sensor; 16. Central bellows; 17. Loading and unloading component; 171. Main body; 172. Connecting part; 173. Load sensor; 174. Connecting piece; 175. Roller loading head. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] In related technologies, lithium hexafluorophosphate in lithium-ion battery electrolytes reacts with air to produce hydrofluoric acid and degrades, and the battery interior is also isolated from air. Therefore, the testing device needs to be air-isolated. Furthermore, implanted stress-strain sensors operate in two conditions depending on their installation location: immersed in a constant-temperature electrolyte and suspended in electrolyte vapor at a constant vapor pressure. Therefore, the testing device must be able to meet the testing requirements of both conditions simultaneously. Specifically, the simulated electrolyte vapor environment test needs to ensure that during sensor loading and unloading, the pressure inside the sealed test container with a movable sealing structure changes, affecting the electrolyte vapor pressure and making it difficult to maintain a constant vapor pressure within the container.

[0026] Therefore, the present invention provides a testing device for internal sensors of a battery. See below for reference. Figures 1-4A test apparatus for a battery internal sensor is described in an embodiment of the present invention.

[0027] In embodiments of the present invention, such as Figures 1-4 As shown, the battery internal sensor testing device 1 includes a sealed testing structure 11 and an extension 12 fixedly connected to the sealed testing structure 11. The extension 12 is provided with a pressure regulating bellows 13, an equal strength beam testing component 14, and a sensor 15. The testing device 1 determines the pressure change of the testing device 1 fixedly connected to the central bellows 16 by the deformation of the central bellows 16. Based on the pressure change of the testing device 1, the pressure regulating bellows 13 undergoes corresponding deformation to maintain the pressure within the sealed testing structure 11 within a relatively constant range, providing an electrolyte testing environment that simulates the battery internal sensor being under constant vapor pressure.

[0028] In other words, the pressure change of the test device 1 can be determined based on the deformation of the central bellows 16. When the pressure change of the test device 1 is determined, the pressure regulating bellows 13 deforms. Then, based on the deformation of the pressure regulating bellows 13, it can be determined that the pressure in the sealed test structure 11 can be maintained within a relatively constant range.

[0029] In order to achieve the deformation of the central bellows 16, in an embodiment of the present invention, the central bellows 16 can be fixedly connected to the loading and unloading component 17. When the loading and unloading component 17 moves up and down, it unloads and loads the sealing test structure 11 respectively. Under the action of the loading and unloading component 17, the central bellows deforms 16 and the pressure of the test device 1 changes.

[0030] In an embodiment of the present invention, the deformation of the central bellows 16 under the action of the loading / unloading component 17 and the change in pressure of the testing device 1 are specifically implemented as follows: When the loading / unloading component 17 moves downward, it is determined that the internal pressure of the sealing test structure 11 increases, and the volume of the sealing test structure 11 is increased and the internal pressure of the sealing test structure 11 is decreased by deforming the pressure regulating bellows 13; when the loading / unloading component 17 moves upward, it is determined that the internal pressure of the sealing test structure 11 decreases, and the volume of the sealing test structure 11 is decreased and the internal pressure of the sealing test structure 11 is increased by deforming the pressure regulating bellows 13.

[0031] In an embodiment of the present invention, the loading and unloading component 17 includes a main body 171 and a connecting portion 172. A central corrugated pipe 16 encloses the connecting portion 172. The connecting portion 172 has a columnar structure, and a load sensor 173 is provided on the columnar structure. The load sensor 173 is connected to the roller loading head 175 through a connector 174. The connector 174 has a threaded hole. For example, the connector 174 can be a metal connecting rod.

[0032] In an embodiment of the present invention, the equal strength beam testing component 14 includes a cantilever beam 141 and a body 142, wherein the body 142 encloses the cantilever beam 141, and the body 142 is provided with an electrode wire end 1421 and a dial indicator mounting hole 1422.

[0033] One end of the cantilever beam 141 is set at a preset position on the sealing test structure 11.

[0034] To prevent the relative position of the rigid indenter and the cantilever beam surface from shifting, in this embodiment of the invention, one end of the cantilever beam 141 contacts the roller loading indenter 175. When the load sensor 173 applies a load, the cantilever beam 141 bends and deforms, and the roller loading indenter 175 rolls autonomously according to the bending deformation of the cantilever beam 141. This avoids the relative position of the rigid indenter and the cantilever beam surface shifting, which would result in uneven force distribution. It also avoids the problem that the method of using weights placed on the suspension frame for loading is not applicable to the sealing test structure 11.

[0035] The cantilever beam 141 and the connecting part 172 are always perpendicular to each other, that is, the cantilever beam 141 and the roller loading head 175 in the connecting part 172 are always perpendicular to each other.

[0036] The cantilever beam 141 is provided with stress and strain sensors on its surface. For example, the stress and strain sensors can be strain gauges, which are attached to a predetermined position on the surface of the cantilever beam 141 with a special adhesive for strain gauges.

[0037] In embodiments of the present invention, to enable the measurement of the electrolyte temperature and electrolyte vapor pressure within the sealed test structure 11, the sensor 15 may include a temperature sensor 1501 and a pressure sensor 1502. The probe of the temperature sensor 1501 is positioned below the electrolyte surface, while the probe of the pressure sensor 1502 is positioned above the electrolyte surface. Both the temperature sensor 1501 and the pressure sensor 1502 are made of stainless steel to withstand electrolyte corrosion. By adjusting the electrolyte content within the sealed test structure 11, the sensor under test can simulate two operating conditions: being immersed in the electrolyte solution and being suspended in electrolyte vapor.

[0038] For example, in order to achieve the isolation of the sealed test structure 11 from the external space, in an embodiment of the present invention, the extension 12 can be connected to the pressure regulating bellows 13, the equal strength beam test component 14 and the sensor 15 via a KF-type vacuum flange. The extension 12 may include multiple extensions, for example, the extension 12 includes a first extension 1201, a second extension 1202, a third extension 1203 and a fourth extension 1204. The first extension 1201 can be connected to the pressure regulating bellows 13 via a KF-type vacuum flange, the second extension 1202 can be connected to the equal strength beam test component 14 via a KF-type vacuum flange, the third extension 1203 can be connected to the temperature sensor 1501 via a KF-type vacuum flange, and the fourth extension 1204 can be connected to the pressure sensor 1502 via a KF-type vacuum flange.

[0039] In order to simulate the battery's operating conditions at different temperatures, in the embodiments of the present invention, the test device 1 may also have an external temperature chamber interface, and an external temperature chamber can be connected through the interface so that the external temperature chamber is combined with the temperature sensor 1501 and the air pressure sensor 1502, so that the test device 1 can simulate the battery's operating conditions at different temperatures.

[0040] According to the battery internal sensor testing device of the present invention, the pressure change of the testing device can be determined by the deformation of the central bellows. When the pressure change of the testing device is determined, the pressure regulating bellows deforms. Then, based on the deformation of the pressure regulating bellows, it can be determined that the pressure in the sealed test structure can be maintained within a relatively constant range, ensuring that the pressure in the sealed test structure remains constant. Furthermore, by combining the temperature sensor and the pressure sensor with the sealed test structure, the electrolyte content in the sealed test structure is changed to simulate two working conditions: the sensor under test is immersed in the electrolyte solution and suspended in the electrolyte vapor. Moreover, by using a roller loading head, it is ensured that the force direction of the cantilever beam is always perpendicular to the initial position during the loading process.

[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0043] Those skilled in the art will understand that all or part of the steps of the methods described in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it includes one or a combination of the steps of the method embodiments.

[0044] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0045] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A testing device for internal sensors of a battery, characterized in that, The testing device includes: a sealing test structure and an extension fixedly connected to the sealing test structure. The extension includes a pressure regulating bellows, an equal-strength beam testing component, and a sensor. The equal-strength beam testing component includes a cantilever beam and a body, with the body enclosing the cantilever beam. The body has electrode wire ends and dial indicator mounting holes. A central bellows is fixedly connected to a loading / unloading component, which includes a body and a connecting portion. The central bellows encloses the connecting portion, which has a columnar structure. A load sensor is mounted on the columnar structure, and the load sensor is connected via a connector and... A roller loading head is connected, and the connector is provided with a threaded hole; when the loading and unloading component moves up and down, it unloads and loads the sealing test structure respectively. Under the action of the loading and unloading component, the central bellows deforms, and the pressure of the test device changes; the test device determines the pressure change of the test device fixedly connected to the central bellows through the deformation of the central bellows. Based on the pressure change of the test device, the pressure regulating bellows deforms accordingly to keep the pressure in the sealing test structure within a relatively constant range, providing an electrolyte test environment for simulating the constant vapor pressure of the internal sensor of the battery; The sensor includes a temperature sensor and a pressure sensor, wherein the probe of the temperature sensor is positioned below the electrolyte surface, and the probe of the pressure sensor is positioned above the electrolyte surface.

2. The testing apparatus for internal sensors of a battery as described in claim 1, characterized in that, When the loading and unloading component moves downward, it is determined that the internal pressure of the sealing test structure increases. The volume of the sealing test structure is increased and the internal pressure of the sealing test structure is reduced by the deformation of the pressure regulating bellows.

3. The testing apparatus for internal sensors of a battery as described in claim 1, characterized in that, When the loading and unloading component moves upward, it is determined that the internal pressure of the sealing test structure decreases. The volume of the sealing test structure is reduced and the internal pressure of the sealing test structure is increased by the deformation of the pressure regulating bellows.

4. The testing apparatus for internal sensors of a battery as described in claim 1, characterized in that, One end of the cantilever beam is positioned at a preset location on the sealing test structure, wherein the cantilever beam and the connecting part are always perpendicular.

5. The testing apparatus for internal sensors of a battery as described in claim 1, characterized in that, One end of the cantilever beam is in contact with the roller loading head. When the load sensor applies a load, the cantilever beam bends and deforms, and the roller loading head rolls autonomously according to the bending deformation of the cantilever beam.

6. The testing apparatus for internal sensors of a battery as described in claim 1, characterized in that, The surface of the cantilever beam is equipped with stress and strain sensors.

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