Cylindrical battery cell expansion force monitoring tool

Abstract

The utility model discloses cylindrical electric core expansion force monitoring frock, include: base, is equipped with detachable apron on it, shell, is located in the base, has the accommodation space in it, the shell presents the surface of the electric core of wrapping type and is pasted, monitoring element is along the circumferential distribution of shell inner wall, is used for monitoring the circumferential expansion force data of electric core, the utility model discloses a wrapping type shell cooperation along the axial distribution of patch type sensor, can monitor the circumferential expansion force of electric core, and the monitoring range is more complete, is not limited to partial, can directly reflect the circumferential distribution characteristic of electric core expansion, simultaneously, single operation can realize monitoring operation, need not frequent adjustment monitoring position.

Description

Technical Field

[0001] This utility model relates to the field of battery cell testing technology, and in particular to a tooling for monitoring the expansion force of cylindrical battery cells. Background Technology

[0002] During the production process of lithium batteries, charge and discharge tests are required. As lithium ions are inserted into and extracted from the electrode active materials during charge and discharge, the battery expands and contracts. In order to find suitable pressure-resistant materials and to study the changes in cell expansion force during charge and discharge, it is necessary to measure the cell expansion force.

[0003] Monitoring battery cells requires data collection from multiple locations. However, most existing monitoring fixtures can only measure local pressure and cannot reflect the circumferential distribution characteristics of cell expansion. Alternatively, they can measure pressure from all directions, but this requires frequent adjustments to the monitoring position, making the operation complex and the monitoring efficiency low. Utility Model Content

[0004] The main purpose of this invention is to provide a tooling for monitoring the expansion force of cylindrical battery cells, aiming to solve existing technical problems.

[0005] To achieve the above objectives, this utility model provides a tooling for monitoring the expansion force of cylindrical battery cells, comprising:

[0006] The base has a removable cover.

[0007] The outer casing is disposed on the base and has an accommodating space therein. The outer casing is wrapped around and fits the surface of the battery cell.

[0008] The monitoring elements are circumferentially distributed along the inner wall of the housing and are used to monitor the circumferential expansion force data of the battery cell.

[0009] Furthermore, the monitoring element is a patch sensor, which is tightly attached to the surface of the battery cell.

[0010] Furthermore, there is a gap between adjacent monitoring elements, and the monitoring elements completely cover the surface of the battery cell.

[0011] Furthermore, the outer shell and the base are detachably connected, and the base has a groove that fits the bottom of the outer shell.

[0012] Furthermore, the base is provided with a column, the column has a threaded groove, and the cover plate is movably sleeved on the column.

[0013] Furthermore, the cover plate is provided with a pressure rod to assist in fixing the battery cell during the measurement process.

[0014] Furthermore, a protective pad is provided at the contact end between the pressure rod and the battery cell.

[0015] Furthermore, a limiting post is provided between the outer shell and the monitoring element, the limiting post is fixedly connected to the outer shell, and the limiting post is set in a one-to-one correspondence with the monitoring element.

[0016] Furthermore, the housing is composed of multiple separation plates corresponding to the monitoring element, and adjacent separation plates are hinged together.

[0017] The beneficial effects of this utility model are reflected in:

[0018] This invention uses a wrap-around shell combined with patch sensors distributed along the axial direction to monitor the circumferential expansion force of the battery cell. The monitoring range is more complete and not limited to a local area. It can directly reflect the circumferential distribution characteristics of the battery cell expansion. At the same time, the monitoring operation can be completed in a single operation without the need for frequent adjustment of the monitoring position. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the cylindrical battery cell expansion force monitoring fixture of this utility model;

[0020] Figure 2 This is a schematic diagram of the monitoring element structure of this utility model;

[0021] Figure 3 This utility model Figure 2 Schematic diagram of the hidden limiting column structure;

[0022] Figure 4 This is a schematic diagram of the outer shell structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the base structure of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] A. Battery cells;

[0026] 100, base; 101, column; 200, cover plate; 201, pressure rod; 300, outer shell; 400, monitoring element; 500, limit post. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0028] Please see Figure 1-5 This utility model provides a tooling for monitoring the expansion force of cylindrical battery cells, including: a base 100, on which a detachable cover plate 200 is provided;

[0029] The outer casing 300 is located on the base 100 and has an accommodating space inside. The outer casing 300 is wrapped and attached to the surface of the battery cell A.

[0030] The monitoring element 400 is circumferentially distributed along the inner wall of the housing 300 and is used to monitor the circumferential expansion force data of cell A.

[0031] Before use, the cover plate 200 is removed from the base 100, and the battery cell A to be tested is placed inside the outer casing 300, so that the monitoring element 400 is in close contact with the surface of the battery cell A. The monitoring element 400, which is closely arranged around the battery cell A, can monitor the circumferential expansion force of the battery cell A. The monitoring range is more complete and not limited to a local area. It can directly reflect the circumferential distribution characteristics of the expansion of the battery cell A. At the same time, the monitoring operation can be completed in a single operation without frequent adjustment of the monitoring position.

[0032] In one embodiment, the monitoring element 400 is a patch sensor, which is tightly attached to the surface of the battery cell. Specifically, the patch sensor can be a DF9-40 or other models capable of performing the corresponding function. The patch pressure sensor utilizes the strain effect of a resistance strain gauge to detect pressure. When the object being measured is subjected to pressure deformation, the strain gauge firmly attached to its surface undergoes mechanical deformation, resulting in a change in resistance. This change is converted into a differential voltage signal output through a Wheatstone bridge circuit. This can be directly obtained by those skilled in the art through existing technology and will not be elaborated upon here.

[0033] In this embodiment, the application of a patch sensor not only allows for a tighter fit with battery cell A but also covers the surface of battery cell A, resulting in more comprehensive monitoring and improved monitoring accuracy.

[0034] In one embodiment, there is a gap between adjacent monitoring elements 400, and the monitoring elements 400 completely cover the surface of cell A.

[0035] It should be noted that the interval area is set so that when cell A expands, it can push the pressure sensing element to move, avoiding the problem of adjacent monitoring elements 400 being squeezed and affecting normal monitoring. In addition, the interval area can be set very small, just enough to allow the monitoring element 400 to move, so that the surface of cell A can cover more monitoring elements 400, improve the integrity of monitoring, and make the expansion force characteristics of cell A more comprehensive.

[0036] In one embodiment, the housing 300 and the base 100 are detachably connected, and the base 100 has a groove that fits the bottom of the housing 300. Specifically, the groove can be configured as multiple annular grooves of different diameters.

[0037] This embodiment is configured such that a suitable outer casing 300 can be selected based on the size of the battery cell A. This ensures that after the battery cell A is placed inside the casing 300, the monitoring element 400 can fit tightly against the surface of the battery cell A, giving the fixture a certain degree of adaptability. Specifically, placing the bottom of the casing 300 into the groove limits its position, and the pressure rod 201 provides a stable force to the cylindrical battery cell, preventing movement during monitoring.

[0038] In one embodiment, a column 101 is provided on the base 100, and a threaded groove is provided on the column 101. The cover plate 200 is movably sleeved on the column 101.

[0039] In this embodiment, the cover plate 200 is moved to a suitable height on the column 101 according to the height of the battery cell A. Then, the cover plate 200 is fixed by screwing nuts into the top and bottom of the cover plate 200. This can accommodate battery cells A of different heights and sizes, thus improving the adaptability of the tooling.

[0040] In one embodiment, a pressure bar 201 is provided on the cover plate 200 to assist in fixing the battery cell A during the measurement process.

[0041] In this embodiment, the pressure rod 201 is designed to assist in fixing the battery cell A during monitoring, preventing displacement of the battery cell A due to its own expansion, which would affect the monitoring accuracy. Specifically, after the cover plate 200 is installed and fixed, the pressure rod 201 is passed through the cover plate 200. After the end of the pressure rod 201 abuts against the battery cell A, nuts are screwed into the pressure rod 201 from both the top and bottom of the cover plate 200 for fixing. The pressure rod 201 is threaded.

[0042] In one embodiment, a protective pad (not labeled in the figure) is provided at the contact end between the pressure rod 201 and the battery cell A. This embodiment is configured in this way to prevent damage to the battery cell A when the pressure rod 201 comes into contact with it; specifically, the protective pad can be made of rubber.

[0043] In one embodiment, a limiting post 500 is provided between the housing 300 and the monitoring element 400. The limiting post 500 is fixedly connected to the housing 300, and the limiting post 500 and the monitoring element 400 are configured in a one-to-one correspondence.

[0044] In this embodiment, the setting of the limiting post 500 can provide further lateral support for the cylindrical battery cell, improve the stability of the cylindrical battery cell during the monitoring process, and thus improve the accuracy of the monitoring data.

[0045] In one embodiment, the housing 300 is composed of a plurality of separation plates corresponding to the monitoring element 400, with adjacent separation plates hinged together. Specifically, the two outermost separation plates can be fixed together by bolts.

[0046] In this embodiment, the appropriate number of separation plates can be used to form outer shells 300 of different diameters according to the diameter of the cylindrical cell being monitored. This allows the outer shell 300 to tightly wrap the cylindrical cell after it is placed inside, thereby enabling data monitoring operations to be successfully performed and improving the applicability of the tooling.

[0047] It should be noted that if the embodiments of this utility model involve directional indicators such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicators will also change accordingly.

[0048] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cylindrical battery cell swelling force monitoring tool, characterized by ,include: A base (100) with a removable cover (200) on it. The outer casing (300) is disposed on the base (100) and has an accommodating space therein. The outer casing (300) is wrapped around the surface of the battery cell. Monitoring elements (400) are circumferentially distributed along the inner wall of the housing (300) for monitoring the circumferential expansion force data of the battery cell.

2. The cylindrical cell expansion force monitoring fixture as described in claim 1, characterized in that: The monitoring element (400) is a patch sensor, which is tightly attached to the surface of the battery cell.

3. The cylindrical cell expansion force monitoring fixture as described in claim 2, characterized in that: There is a gap between adjacent monitoring elements (400), and the monitoring elements (400) completely cover the surface of the battery cell.

4. The cylindrical cell expansion force monitoring fixture as described in claim 1, characterized in that: The outer shell (300) is detachably connected to the base (100), and the base (100) has a groove that fits the bottom of the outer shell (300).

5. The cylindrical cell expansion force monitoring fixture as described in claim 1, characterized in that: The base (100) is provided with a column (101), the column (101) is provided with a threaded groove, and the cover plate (200) is movably sleeved on the column (101).

6. The cylindrical cell expansion force monitoring fixture as described in claim 1, characterized in that: The cover plate (200) is provided with a pressure rod (201) for assisting in fixing the battery cell during the measurement process.

7. The cylindrical cell expansion force monitoring fixture as described in claim 6, characterized in that: The pressure rod (201) has a protective pad at the contact end with the battery cell.

8. The cylindrical cell expansion force monitoring fixture as described in claim 1, characterized in that: A limiting post (500) is provided between the outer shell (300) and the monitoring element (400). The limiting post (500) is fixedly connected to the outer shell (300), and the limiting post (500) is set one-to-one with the monitoring element (400).

9. The cylindrical cell expansion force monitoring fixture as described in claim 1, characterized in that: The housing (300) is composed of a plurality of separation plates corresponding to the monitoring element (400), and adjacent separation plates are hinged together.

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