Battery deformation degree monitoring device

Abstract

The utility model provides a battery deformation degree monitoring device, which comprises a battery and two oppositely arranged clamping plates, the battery is placed between the two clamping plates, and one sides, facing the battery, of the two clamping plates are respectively provided with a heat insulation plate; and the pressure monitoring assembly is placed on the side, facing the clamping plate, of the battery, the pressure monitoring assembly comprises a pressure measuring device and a pressure monitoring frame, the pressure measuring device is installed in the pressure monitoring frame, and the pressure measuring device is attached to the battery. According to the utility model, the technical problems in the prior art that the internal fault of the battery is possibly covered and the safety is weak because the deformation of the battery volume in the thermal runaway experiment is difficult to observe in the process of the battery formation process can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery testing equipment, in particular to a battery deformation degree monitoring device. Background Art

[0002] With the development of new energy technologies, electrochemical energy storage technology has become a key force in promoting the transformation of the global energy structure to green and low-carbon with its remarkable progress. This technology plays a vital role in achieving the global carbon peak and carbon neutrality goals. Among them, lithium-ion battery technology is unique among many energy storage solutions with its excellent energy density, long cycle life and optimized lightweight design, and has become the preferred energy solution for a variety of devices and systems.

[0003] The manufacturing process of lithium-ion batteries is a highly sophisticated process collection, including slurrying, coating, rolling, slitting, assembly and other key steps. Among these steps, the formation process is particularly critical, which has a decisive influence on the final performance and stability of the battery. The core goal of the formation process is to activate the battery through precise charge and discharge cycles to ensure that it reaches the best working state. However, during the formation process, the charge and discharge cycle will trigger a complex chemical chain reaction inside the battery, causing gas to be generated inside the battery and releasing heat, which may cause the battery volume to deform. Since the deformation of the battery volume will only reach 1% to 3% of the battery volume, it is difficult to observe, so it may cover up internal battery failures, increase the risk of accidents during subsequent use of the battery, and have weak safety.

[0004] In view of this, the inventor proposes a battery deformation degree monitoring device. Utility Model Content

[0005] In view of the shortcomings of the prior art, the utility model proposes a battery deformation degree monitoring device to solve the technical problem in the prior art that during the battery formation process, the battery volume deformation in the thermal runaway experiment is difficult to observe, which may conceal the internal fault of the battery and lead to poor safety.

[0006] The technical solution adopted by the utility model is to provide a battery deformation degree monitoring device, comprising: a battery and two clamping plates arranged opposite to each other, the battery is placed between the two clamping plates, and the two clamping plates are respectively provided with heat insulation plates on one side facing the battery; and

[0007] A pressure monitoring component is placed on the side of the battery facing the clamping plate. The pressure monitoring component includes a pressure measuring device and a pressure monitoring frame. The pressure measuring device is installed in the pressure monitoring frame and is in contact with the battery.

[0008] Furthermore, the pressure monitoring frame includes a peripheral frame and a sliding rod, and there are a plurality of sliding rods, each of which is arranged in parallel in the peripheral frame.

[0009] Furthermore, there are a plurality of pressure measuring devices, and each of the pressure measuring devices is slidably disposed on each of the sliding rods.

[0010] Furthermore, each of the sliding rods is provided with at least two of the pressure measuring devices.

[0011] Furthermore, the pressure measuring device includes a sliding shell and a mica sheet. A cavity is formed in the sliding shell, and the mica sheet is rotatably mounted in the cavity.

[0012] Furthermore, a sliding groove is formed on the outer surface of the sliding housing, and the pressure measuring device is slidably arranged on the sliding rod through the sliding groove.

[0013] Furthermore, a plurality of magnetic components are provided in the heat insulation board, and the magnetic components are arranged in parallel.

[0014] Furthermore, it also includes a connecting rod, through which the two clamping plates are connected, and the two clamping plates can move closer to or farther away from each other on the connecting rod to apply a clamping force to the battery.

[0015] Furthermore, the connecting rods include a plurality of connecting rods, and each connecting rod is distributed around the two clamping plates.

[0016] It can be seen from the above technical solution that the beneficial technical effects of the utility model are as follows:

[0017] The utility model provides a battery deformation degree monitoring device. Firstly, clamping plates are arranged relatively to each other, and the battery is clamped between the clamping plates. Heat insulation plates are arranged on both sides of the battery clamping plates in contact with the battery. Then, a pressure monitoring component is arranged between the battery and the heat insulation plate, and a pressure monitor in the pressure monitoring component is fitted with the battery. In the process of charge and discharge cycle of the battery in the formation process, the deformation of the battery can be observed in real time through the pressure monitoring component, and then the failure of the battery in the formation process can be discovered in time, and the battery can be maintained in time, so as to avoid the technical problem in the prior art that the battery volume deformation in the thermal runaway experiment during the battery formation process is difficult to observe, which may cover up the internal failure of the battery and the weak safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0019] Figure 1 A schematic diagram of the overall structure of a battery deformation degree monitoring device provided for Example 1 of the utility model;

[0020] Figure 2 A side view of the overall structure of a battery deformation degree monitoring device provided for Example 1 of the utility model;

[0021] Figure 3 A structural front view of a pressure monitoring assembly provided for a battery deformation degree monitoring device in Example 1 of the utility model;

[0022] Figure 4 A structural rear view of a pressure monitoring assembly provided for a battery deformation degree monitoring device in Example 1 of the utility model;

[0023] Figure 5 A schematic diagram of the structure of a heat insulation plate corresponding to a pressure monitoring component provided in a battery deformation degree monitoring device according to Example 1 of the utility model;

[0024] Figure 6 A structural schematic diagram and a cross-sectional view of a pressure measuring device provided for a battery deformation degree monitoring device according to Embodiment 1 of the present utility model;

[0025] Figure 7 A side view of a pressure measuring device provided for a battery deformation degree monitoring device in Example 1 of the utility model;

[0026] Reference numerals:

[0027] 1-battery; 2-clamping plate; 3-insulation plate, 31-magnetic part; 4-pressure monitoring assembly, 41-pressure measuring device, 411-sliding shell, 4111-slide groove, 4112-cavity, 412-mica sheet, 42-pressure monitoring frame, 421-peripheral frame, 422-slide rod; 5-connecting rod. DETAILED DESCRIPTION

[0028] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0029] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0030] In order to solve the technical problem in the prior art that during the battery formation process, the battery volume deformation occurring in the thermal runaway experiment is difficult to observe, which may conceal the internal faults of the battery and lead to poor safety, this embodiment provides a battery deformation degree monitoring device.

[0031] like Figure 1 to Figure 2 As shown, the deformation degree monitoring device of the battery 1 comprises: a battery 1 and two clamping plates 2 arranged opposite to each other, the battery 1 is placed between the two clamping plates 2, and the two clamping plates 2 are respectively provided with heat insulation plates 3 on one side facing the battery 1, and the clamping plates 2 are used to fix the battery 1 to ensure the stable position of the battery 1 during the monitoring process; and

[0032] The pressure monitoring component 4 is placed on the side of the battery 1 facing the clamping plate 2. Specifically, the pressure monitoring component 4 includes a pressure measuring device 41 and a pressure monitoring frame 42. The pressure measuring device 41 is installed in the pressure monitoring frame 42, and the pressure measuring device 41 is attached to the battery 1 for real-time monitoring of the slight deformation of the battery 1 during the charging and discharging process.

[0033] That is, this embodiment provides a device for monitoring the deformation degree of a battery 1. First, clamping plates 2 are relatively arranged to clamp the battery 1 between the clamping plates 2. Heat insulation plates 3 are arranged on both sides of the battery 1 where the clamping plates 2 contact the battery 1. Then, a pressure monitoring component 4 is arranged between the battery 1 and the heat insulation plate 3, and the pressure monitor in the pressure monitoring component 4 is fitted with the battery 1. During the charge and discharge cycle of the formation process of the battery 1, the deformation of the battery 1 can be observed in real time through the pressure monitoring component 4, so that the failure of the battery 1 during the formation process can be discovered in time, and the battery 1 can be maintained in time, thereby avoiding the technical problem in the prior art that during the formation process of the battery 1, the volume deformation of the battery 1 caused by the charge and discharge cycle is difficult to observe, which may cover up the internal failure of the battery 1 and the poor safety.

[0034] This embodiment is preferred, as Figure 3 to Figure 4 As shown, the pressure monitoring frame 42 includes a peripheral frame 421 and a slide bar 422. There are a plurality of slide bars 422, and each slide bar 422 is arranged in parallel in the peripheral frame 421. As a preferred solution of this embodiment, there are a plurality of pressure measuring devices 41, and each pressure measuring device 41 is slidably arranged on each slide bar 422, and at least two pressure measuring devices 41 are arranged on each slide bar 422. In this embodiment, a total of three slide bars 422 are preferably provided, and three pressure measuring devices 41 are arranged on each slide bar 422. A slide groove 4111 is formed on the outer surface of the sliding housing 411, and the pressure measuring device 41 is slidably arranged on the slide bar 422 through the slide groove 4111. The slide groove 4111 cooperates with the slide bar 422 to realize the sliding arrangement, so that the pressure measuring device 41 can flexibly follow the deformation of the battery 1 and can follow its movement, thereby accurately capturing the deformation amount.

[0035] like Figure 6 to Figure 7 As shown, in the present embodiment, the pressure measuring device 41 comprises a sliding shell 411 and a mica sheet 412. A cavity 4112 is formed in the sliding shell 411. The mica sheet 412 is arranged in the cavity 4112. In the present embodiment, the mica sheet 412 is used as a pressure sensitive element. When subjected to pressure, deformation or electrical signal change will occur, thereby reflecting the deformation of the battery 1.

[0036] This embodiment is preferred, as Figure 5 As shown, a plurality of magnetic members 31 are provided in the heat insulation plate 3, and each magnetic member 31 is arranged in parallel. In this embodiment, the parallel arrangement of the magnetic members 31 enables the pressure measuring device 41 to remain relatively stable when the battery 1 is installed through the clamping plate 2, so that each part of the battery 1 can be fitted, ensuring that each part of the battery 1 can be monitored in real time during the subsequent deformation monitoring process of the battery 1

[0037] like Figure 1 to Figure 2 As shown, it also includes a connecting rod 5, and the two clamping plates 2 are connected by the connecting rod 5, and the two clamping plates 2 can be close to or away from each other on the connecting rod to apply a clamping force to the battery 1, and the connecting rod 5 includes a plurality of connecting rods, each connecting rod 5 is distributed around the two clamping plates 2, and in this embodiment, it is preferred that there are four connecting rods 5, and they are preferably threaded. With this arrangement, the connecting rod 5 can adapt to batteries 1 of different sizes and shapes, improving the versatility of the monitoring device provided by this embodiment, and the connecting rod 5 is distributed around the clamping plate 2, ensuring that the clamping plate 2 is evenly stressed when clamping the battery 1, and preventing the battery 1 from shifting or tilting during the monitoring process.

[0038] Specifically, when using Figure 1 As shown, for a certain square shell lithium-ion battery 1, the battery 1 is 130mm long, 55mm wide and 130m high, and the positive and negative lines are connected to the positive and negative ends of the battery 1 respectively. A pressure measuring device 41 is attached to one side of the battery 1. According to the 3X2 array distribution method selected for the battery 1, the pressure measuring device 41 can be moved up, down, left and right along the slide bar 422 through the slide bar 422. One side of the battery 1 is close to the pressure measuring device 41, and the other side of the battery 1 is attached to the heat insulation board 3 made of alumina ceramic. The heat insulation board 3 is 220mm long and 130mm wide and is close to the battery 1 and has the same size as the battery 1. The main function of the two heat insulation boards 3 is heat insulation. In this embodiment, the pressure assembly includes 9 pressure measuring devices 41, and each slide bar 422 has three pressure measuring devices 41. There are a total of 9 expansion force measuring devices on the three slide bars 422. Figure 3 to Figure 4As shown, the pressure measuring device 41 is installed on the slide rod 422 through the slide groove 4111 of the sliding housing 411 of the pressure measuring device 41, wherein the pressure plate is fixed through the slide groove 4111 with a diameter of 12 mm and a depth of 0.5 mm on the front side of the iron shell, and the pressure measuring device 41 has a built-in mica sheet 412, the side length of the mica sheet 412 is 16 mm, and the thermal conductivity of the mica sheet 412 is 0.81 W / m 2 The main function is heat insulation, and at the same time, the expansion force is transmitted to the pressure plate. The data measured by the pressure is connected to the controller to the PC, and the measured value is displayed in real time.

[0039] Furthermore, there are threaded holes with a diameter of 20 mm at the four corners of the two clamping plates 2. Bolts are placed in the threaded holes. The bolts and nuts are adjusted as adjustable connecting rods 5, so that the clamping plates 2 clamp the battery 1. The bolts and nuts are adjusted so that the iron plate has different preload forces on different parts of the battery 1. Combined with the pressure measuring device 41, the preload force set before the thermal runaway of the battery 1 can be adjusted in real time. When the battery 1 has a thermal runaway, the good heat insulation ability of the mica sheet 412 effectively protects the pressure sheet, so that the pressure sheet can work normally in a high temperature environment.

[0040] The pressure measuring device 41 mainly realizes the specific expansion force measurement through the interaction of forces. Since the constant current DC source continuously charges the battery 1 with a current of 50.5A, during the overcharging process, the negative electrode of the battery 1 continuously embeds lithium ions and even precipitates lithium to form lithium, which leads to a series of chain thermal decomposition reactions, and then causes thermal runaway of the battery 1. During the whole process, gas will be continuously generated, causing the battery 1 to expand in all directions, but the battery 1 mainly expands in the main direction of the front and back surfaces of the battery 1. Therefore, the pressure measuring devices 41 are distributed on the side of the battery 1, and each pressure measuring device 41 is connected to the control board and the PC end. The monitored readings are displayed in real time on the PC end. The change value measured during the whole process is the change in the expansion force of the battery 1.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A battery deformation monitoring device, characterized in that: include: A battery and two clamping plates arranged opposite to each other, wherein the battery is placed between the two clamping plates, and a heat insulation plate is respectively arranged on one side of the two clamping plates facing the battery; and A pressure monitoring component is placed on the side of the battery facing the clamping plate. The pressure monitoring component includes a pressure measuring device and a pressure monitoring frame. The pressure measuring device is installed in the pressure monitoring frame and is in contact with the battery.

2. The battery deformation degree monitoring device according to claim 1, characterized in that: The pressure monitoring frame comprises a peripheral frame and a sliding rod, wherein there are a plurality of sliding rods, and each of the sliding rods is arranged in parallel in the peripheral frame.

3. The battery deformation degree monitoring device according to claim 2, characterized in that: There are a plurality of pressure measuring devices, and each of the pressure measuring devices is slidably arranged on each of the sliding rods.

4. The battery deformation degree monitoring device according to claim 3, characterized in that: At least two pressure measuring devices are arranged on each of the sliding rods.

5. The battery deformation degree monitoring device according to claim 3, characterized in that: The pressure measuring device comprises a sliding shell and a mica sheet. A cavity is formed in the sliding shell, and the mica sheet is rotatably arranged in the cavity.

6. The battery deformation degree monitoring device according to claim 5, characterized in that: A sliding groove is formed on the outer surface of the sliding housing, and the pressure measuring device is slidably arranged on the sliding rod through the sliding groove.

7. The battery deformation degree monitoring device according to claim 1, characterized in that: A plurality of magnetic components are arranged in the heat insulation board, and the magnetic components are arranged in parallel.

8. The battery deformation degree monitoring device according to claim 1, characterized in that: It also includes a connecting rod, through which the two clamping plates are connected, and the two clamping plates can move closer to or farther away from each other on the connecting rod to apply a clamping force to the battery.

9. The battery deformation degree monitoring device according to claim 8, characterized in that: The connecting rods include a plurality of connecting rods, each of which is distributed around the two clamping plates.

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