A stress-temperature measuring device for new energy lithium batteries

Abstract

This utility model relates to the field of battery stress and temperature measurement technology, and discloses a new energy lithium battery stress and temperature measurement device, including a device shell. A protective door is hinged to the outer surface of the device shell. A pressure relief mechanism for relieving pressure on the device is provided on the upper surface of the device shell. A measuring mechanism for measuring the lithium battery is provided inside the device shell. The pressure relief mechanism includes a movable plate, which is movably mounted on the upper end of the device shell. Limiting blocks, which are fixedly connected to the device shell, are provided on both sides of the lower surface of the movable plate. A fixing plate is fixed to the lower surface of the limiting blocks, and two guide rods penetrate through the interior of the fixing plate. This utility model provides protection through the device shell. When high pressure is generated inside the device shell, the pressure pushes the movable plate to move, causing the movable plate to separate from the device shell. At this time, the internal pressure is discharged to the outside, thereby reducing the occurrence of secondary hazards.

Description

Technical Field

[0001] This utility model relates to the field of battery stress temperature measurement technology, specifically a stress temperature measurement device for new energy lithium batteries. Background Technology

[0002] Lithium-ion battery stress-temperature measurement devices are key equipment used to monitor internal stress and temperature changes in lithium-ion batteries during charging, discharging, use, and storage. Their technological development is crucial for ensuring battery safety and optimizing battery performance. Fiber Bragg grating (FBG) sensors: These reflect minute internal deformations of the battery by varying the wavelength of the grating in the optical fiber, offering advantages such as resistance to electromagnetic interference and high sensitivity. Thermocouples / thermistors: These measure temperature based on the thermoelectric effect or the characteristic of resistance changing with temperature.

[0003] In existing technologies, such as the static testing structure for a power lithium battery cover disclosed in CN222419769U, a main block and a connecting plate are included. The front edge of the main block is chamfered. Directional blocks are fixedly connected to the top, right, and back surfaces of the main block via fastening mechanisms. Threaded openings are provided on the top of the directional blocks. Positioning blocks are fixedly connected to the directional blocks on the top and right sides of the main block near the first chamfer. A central hole is provided on the connecting plate, and a second chamfer is provided at the back edge of the connecting plate. This structure enables the measurement of torque and static force along the X, Y, and Z axes of the lithium battery cover, yielding corresponding stress-strain curves. This allows for the determination of the three-dimensional torque and static force of the lithium battery cover, thus providing better evidence for the mechanical analysis of lithium batteries.

[0004] Existing devices can measure the torque and static force of lithium battery cover plates along the X, Y, and Z axes and obtain the corresponding stress-strain curves, thereby obtaining the three-dimensional torque and static force of the lithium battery cover plate. However, most devices do not provide protection when measuring battery stress and temperature. In the event of an accidental explosion during battery measurement, it can easily cause injury to the test personnel. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] Given that most of the devices mentioned above or in the prior art do not provide protection when measuring battery stress temperature, an accidental explosion during battery measurement could easily cause injury to test personnel.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A stress temperature measuring device for a new energy lithium battery includes a device housing, a protective door hinged to the outer surface of the device housing, a pressure relief mechanism for relieving pressure on the device on the upper surface of the device housing, and a measuring mechanism for measuring the lithium battery inside the device housing.

[0009] The pressure relief mechanism includes a movable plate, which is movably installed on the upper end of the device housing. Limiting blocks that are fixedly connected to the device housing are provided on both sides of the lower surface of the movable plate. A fixing plate is fixed on the lower surface of the limiting blocks. Two guide rods pass through the interior of the fixing plate. A compression spring that abuts against the lower surface of the fixing plate is sleeved on the outer surface of the two guide rods.

[0010] As a further improvement of this utility model, a protective net is fixed to the inner wall of the device housing in the horizontal direction and near the bottom of the two guide rods.

[0011] As a further embodiment of this utility model: the measuring mechanism includes a fixed base, which is installed inside the housing of the device, and a clamping electric cylinder is fixed to one side of the fixed base by bolts.

[0012] As a further improvement of this utility model: the telescopic end of the clamping cylinder is fixed with a clamping plate, and the side wall of the clamping plate is connected to the lithium battery body.

[0013] As a further improvement of this utility model: two plastic clips are installed on the outer surface of the lithium battery body, and each of the two plastic clips has an installation groove inside.

[0014] As a further embodiment of this utility model: a temperature sensor is installed inside one of the plastic clamps, and a grating strain sensor is installed inside the other plastic clamp.

[0015] As a further improvement of this utility model: the output end of the grating strain sensor is connected to an optical fiber, and the end of the optical fiber is connected to an optical fiber signal demodulator fixed on the housing of the device.

[0016] As a further improvement of this utility model, a DC power supply that is fixedly connected to a mounting base is installed on the lower surface inside the housing of the device.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This utility model uses a clamping electric cylinder set on a fixed base to drive the clamping plate to move, thereby clamping and limiting the lithium battery body. Then, two plastic clamping blocks are respectively fitted onto the outer surface of the lithium battery body. The temperature sensor and the grating strain sensor can be respectively assembled into the two plastic clamping blocks through the mounting grooves opened in the plastic clamping blocks.

[0019] 2. This utility model can power the lithium battery body through the DC power supply inside the device housing and perform charging measurement on the lithium battery body. When the lithium battery body is charging, the temperature sensor can detect the temperature of the lithium battery body and send the detected data to the computer for processing and display through wires.

[0020] 3. The device shell can effectively provide protection. When high pressure is generated inside the device shell, the pressure will push the movable plate to move, causing the movable plate to separate from the device shell. At this time, the internal pressure is discharged to the outside, thereby reducing the occurrence of secondary danger.

[0021] 4. The protective net provided by this utility model can play a certain protective role. When the internal pressure drops, the movable plate is driven to reset during the extension and reset process of the compression spring. The limit block can play a limiting role, and the fixed plate can ensure the stability of the guide rod movement. Attached Figure Description

[0022] Figure 1 A three-dimensional structural schematic diagram of a stress-temperature measuring device for new energy lithium batteries;

[0023] Figure 2 This is a schematic diagram of the internal structure of the outer shell of a stress-temperature measuring device for new energy lithium batteries.

[0024] Figure 3 This is a three-dimensional structural diagram of a mounting base in a stress-temperature measuring device for new energy lithium batteries.

[0025] Figure 4 This is a three-dimensional structural diagram of the lithium battery body in a new energy lithium battery stress temperature measurement device.

[0026] In the diagram: 1. Device housing; 2. Protective door; 3. Movable plate; 31. Limiting block; 32. Fixing plate; 33. Guide rod; 34. Compression spring; 35. Protective net; 4. Fixing base; 41. Clamping cylinder; 42. Clamping plate; 43. Lithium battery body; 44. Plastic clamping block; 45. Mounting slot; 46. Temperature sensor; 47. Grating strain sensor; 48. Fiber optic cable; 5. DC power supply; 6. Fiber optic signal demodulator. Detailed Implementation

[0027] To make the above-mentioned objectives, features and advantages of this utility model more readily understood, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0030] Example 1

[0031] Please see Figure 1 - Figure 4 This is the first embodiment of the present utility model. This embodiment provides a stress temperature measuring device for a new energy lithium battery, including a device housing 1, a protective door 2 hinged to the outer surface of the device housing 1, a pressure relief mechanism for relieving pressure on the device on the upper surface of the device housing 1, and a measuring mechanism for measuring the lithium battery inside the device housing 1.

[0032] The pressure relief mechanism includes a movable plate 3, which is movably installed on the upper end of the device housing 1. Limiting blocks 31 that are fixedly connected to the device housing 1 are provided on both sides of the lower surface of the movable plate 3. A fixed plate 32 is fixed on the lower surface of the limiting block 31. Two guide rods 33 pass through the interior of the fixed plate 32. A compression spring 34 that abuts against the lower surface of the fixed plate 32 is sleeved on the outer surface of the two guide rods 33.

[0033] Specifically, a protective net 35 is fixed horizontally on the inner wall of the device housing 1, near the bottom of the two guide rods 33.

[0034] Furthermore, when an accidental explosion occurs during battery charging, the outer casing 1 can effectively provide protection. When high pressure is generated inside the outer casing 1, the pressure will push the movable plate 3 to move, causing the movable plate 3 to separate from the outer casing 1. At this time, the internal pressure is discharged to the outside, thereby reducing the occurrence of secondary dangers.

[0035] Specifically, the measuring mechanism includes a fixed base 4, which is installed inside the device housing 1. A clamping cylinder 41 is fixed to one side of the fixed base 4 by bolts. A clamping plate 42 is fixed to the telescopic end of the clamping cylinder 41. A lithium battery body 43 is connected to the side wall of the clamping plate 42.

[0036] Furthermore, the clamping cylinder 41 provided on the fixed base 4 can drive the clamping plate 42 to move, thereby clamping and limiting the lithium battery body 43.

[0037] In use, when an accidental explosion occurs during battery charging, the outer casing 1 can effectively provide protection. When high pressure is generated inside the outer casing 1, the pressure will push the movable plate 3 to move, causing the movable plate 3 to separate from the outer casing 1. At this time, the internal pressure is discharged to the outside, thereby reducing the occurrence of secondary danger. When the movable plate 3 moves, it will drive the guide rod 33 to move, compressing the compression spring 34. The protective net 35 can provide a certain degree of protection. When the internal pressure drops, the movable plate 3 will be reset during the extension and reset process of the compression spring 34. The limit block 31 can play a limiting role. The stability of the movement of the guide rod 33 can be ensured by the fixed plate 32.

[0038] In summary, this new energy lithium battery stress temperature measuring device can effectively protect lithium batteries during use, preventing injury to workers in the event of a lithium battery explosion. Furthermore, when an accidental explosion occurs during battery charging, the high pressure generated inside the device's outer casing 1 will push the movable plate 3 to move, causing the movable plate 3 to separate from the outer casing 1, releasing the internal pressure to the outside, thereby reducing the occurrence of secondary hazards.

[0039] Example 2

[0040] Please see Figure 1 - Figure 4 This is the second embodiment of the present utility model.

[0041] Specifically, two plastic clips 44 are installed on the outer surface of the lithium battery body 43. Each of the two plastic clips 44 has an installation groove 45 inside. A temperature sensor 46 is installed inside one plastic clip 44, and a grating strain sensor 47 is installed inside the other plastic clip 44.

[0042] Furthermore, the temperature sensor 46 can detect the temperature of the lithium battery body 43 and send the detected data to a computer for processing and display via wires.

[0043] Specifically, the output end of the grating strain sensor 47 is connected to an optical fiber line 48, and the end of the optical fiber line 48 is connected to an optical fiber signal demodulator 6 fixed on the device housing 1.

[0044] Furthermore, the grating strain sensor 47 is equipped with an optical fiber line 48, through which data is transmitted to the optical fiber signal demodulator 6.

[0045] Specifically, a DC power supply 5, which is fixedly connected to the mounting base 4, is installed on the lower surface inside the device housing 1.

[0046] Furthermore, the DC power supply 5 inside the device housing 1 can supply power to the lithium battery body 43 and perform charging measurement on the lithium battery body 43.

[0047] In use, first place the device housing 1 in a suitable position. Then, open the protective door 2 on the device housing 1, and place the lithium battery body 43 to be measured into the fixing base 4. The clamping cylinder 41 on the fixing base 4 can drive the clamping plate 42 to move, thereby clamping and limiting the lithium battery body 43. Then, two plastic clamping blocks 44 are respectively fitted onto the outer surface of the lithium battery body 43. The temperature sensor 46 and the grating strain sensor 47 can be respectively assembled into the two plastic clamping blocks 44 through the mounting groove 45 opened in the plastic clamping blocks 44. The grating strain sensor 47 has an optical fiber 48. Data is transmitted through the grating strain sensor 47 and the fiber optic signal demodulator 6 via the fiber optic cable 48. The DC power supply 5 inside the device housing 1 can power the lithium battery body 43 and perform charging measurement on the lithium battery body 43. When the lithium battery body 43 is charging, the temperature sensor 46 can detect the temperature of the lithium battery body 43 and send the detected data to the computer for processing and display via the wire. The grating strain sensor 47 can detect the stress change of the lithium battery body 43 and send the data to the fiber optic signal demodulator 6 for processing via the fiber optic cable 48. The processed data is then sent to the computer for viewing via the wire.

[0048] In summary, this new energy lithium battery stress and temperature measuring device can effectively protect lithium batteries during use, preventing injury to workers in the event of a lithium battery explosion. Furthermore, in the event of an accidental explosion during battery charging, the high pressure generated inside the device's outer casing 1 will push the movable plate 3 to separate from the outer casing 1, releasing the internal pressure to the outside and reducing the risk of secondary hazards. The temperature sensor 46 can detect the temperature of the lithium battery body 43, and the detected data is transmitted to a computer for processing and display via wires. The grating strain sensor 47 can detect stress changes in the lithium battery body 43.

[0049] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0050] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0051] It should be understood that numerous specific implementation decisions can be made during the development of any actual implementation method, and in any engineering or design project. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A new energy lithium battery stress temperature measuring device, comprising a device shell (1), characterized in that: The outer surface of the device housing (1) is hinged with a protective door (2), the upper surface of the device housing (1) is provided with a pressure relief mechanism for relieving pressure on the device, and the interior of the device housing (1) is provided with a measuring mechanism for measuring lithium batteries. The pressure relief mechanism includes a movable plate (3), which is movably installed on the upper end of the device housing (1). Both sides of the lower surface of the movable plate (3) are provided with limiting blocks (31) that are fixedly connected to the device housing (1). A fixing plate (32) is fixed on the lower surface of the limiting block (31). Two guide rods (33) pass through the interior of the fixing plate (32). The outer surfaces of the two guide rods (33) are fitted with compression springs (34) that abut against the lower surface of the fixing plate (32).

2. The stress temperature measuring device for new energy lithium battery according to claim 1, characterized in that: A protective net (35) is fixed to the inner wall of the device housing (1) in the horizontal direction and near the bottom of the two guide rods (33).

3. The stress temperature measuring device for new energy lithium battery according to claim 2, characterized in that: The measuring mechanism includes a fixed base (4), which is installed inside the housing (1) of the device. A clamping electric cylinder (41) is fixed to one side of the fixed base (4) by bolts.

4. The stress temperature measuring device for a new energy lithium battery according to claim 3, characterized in that: The telescopic end of the clamping cylinder (41) is fixed with a clamping plate (42), and the side wall of the clamping plate (42) is connected to the lithium battery body (43).

5. The stress temperature measuring device for a new energy lithium battery according to claim 4, characterized in that: Two plastic clips (44) are installed on the outer surface of the lithium battery body (43), and each of the two plastic clips (44) has an installation groove (45) inside.

6. The stress temperature measuring device for a new energy lithium battery according to claim 5, characterized in that: A temperature sensor (46) is installed inside one of the plastic clamps (44), and a grating strain sensor (47) is installed inside the other plastic clamp (44).

7. The stress temperature measuring device for a new energy lithium battery according to claim 6, characterized in that: The output end of the grating strain sensor (47) is connected to an optical fiber line (48), and the end of the optical fiber line (48) is connected to an optical fiber signal demodulator (6) fixed on the housing (1) of the device.

8. The stress temperature measuring device for a new energy lithium battery according to claim 7, characterized in that: A DC power supply (5) is fixedly connected to the mounting base (4) on the lower surface inside the outer casing (1) of the device.

Images