Battery internal pressure monitoring device

Abstract

The utility model discloses a battery internal pressure monitoring device, which comprises a container, a pressure sensor, a first electrode and a second electrode, a mounting cavity is formed in the container, the first electrode is arranged at the upper part of the mounting cavity, the second electrode is arranged at the lower part of the mounting cavity, the pressure sensor is arranged in the mounting cavity, and the first electrode is arranged in the mounting cavity. And the pressure sensor is used for monitoring the air pressure change in the container. Through the application of the in-situ internal pressure monitoring device, the device for monitoring the in-situ internal pressure of the battery is provided, is particularly suitable for a battery cell of a cylindrical battery, can meet the monitoring requirements of cylindrical batteries with different sizes, is accurate in monitoring effect and convenient to use, and is beneficial to subsequent safety evaluation and battery explosion-proof design work.

Description

Technical Field

[0001] The utility model relates to the technical field of battery testing, and particularly relates to a device for monitoring the internal pressure of a battery. Background Art

[0002] The reasons for gas generation in lithium-ion batteries include electrode materials, electrolytes, working conditions, and usage environments. Gas is generated under conditions such as high temperature, high pressure, overcharge / discharge, and closed-loop formation. Gas generation in batteries not only affects the electrical performance of the batteries but may also cause problems such as bulging, swelling, rupture, air leakage, and even explosion of the batteries. Therefore, corresponding measures need to be taken to monitor the state of the batteries and pay attention to their safety performance. At the same time, in-situ monitoring of the internal air pressure of the batteries helps with theoretical analysis of the system and is of great significance for the application design of materials, electrolytes, structural components, etc.

[0003] There is a lack of means for monitoring the internal pressure of cylindrical batteries, and the process and assembly of self-assembled internal pressure testing devices are relatively complex. Summary of the Utility Model

[0004] In view of this, to solve the above problems, the purpose of the utility model is to provide a device for monitoring the internal pressure of a battery, including: a container, a pressure sensor, a first electrode, and a second electrode. An installation cavity is formed inside the container. The first electrode is arranged at the upper part of the installation cavity, the second electrode is arranged at the lower part of the installation cavity, and the pressure sensor is arranged inside the installation cavity. The pressure sensor is used to monitor the change in air pressure inside the container.

[0005] In another preferred embodiment, the container includes: a top seat and a bottom seat. The top seat is detachably installed at the upper end of the bottom seat, and the installation cavity is formed between the top seat and the bottom seat.

[0006] In another preferred embodiment, a first cavity is formed inside the top seat, and a second cavity is formed inside the bottom seat. The first cavity and the second cavity together form the installation cavity.

[0007] In another preferred embodiment, the pressure sensor and the first electrode are both arranged inside the first cavity, and the second electrode is arranged inside the second cavity.

[0008] In another preferred embodiment, it further includes: a telescopic component. The upper end of the telescopic component is connected to the top seat, and the lower end of the telescopic component is connected to the first electrode.

[0009] In another preferred embodiment, it further includes: a first wire, one end of the first wire is connected to the first electrode, a hollow channel is formed in the telescopic member, and the other end of the first wire sequentially passes through the hollow channel and the top seat and extends outward.

[0010] In another preferred embodiment, it further includes: a data wire, one end of the data wire is connected to the pressure sensor, and the other end of the data wire sequentially passes through the hollow channel and the top seat and extends outward.

[0011] In another preferred embodiment, the telescopic member passes through the pressure sensor.

[0012] In another preferred embodiment, it further includes: a second wire, one end of the second wire is connected to the second electrode, and the other end of the second wire passes through the base and extends outward.

[0013] In another preferred embodiment, the top seat is threadedly connected to the base.

[0014] Due to the adoption of the above technical solution, the positive effects of the present utility model compared with the prior art are:

[0015] By applying the present utility model, a device for in-situ internal pressure monitoring of a battery is provided, which is particularly suitable for the winding core of a cylindrical battery, can meet the monitoring requirements of cylindrical batteries of different sizes, has accurate monitoring effects, is easy to use, and is conducive to the subsequent safety assessment and battery explosion-proof design work. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an overall schematic diagram of a battery internal pressure monitoring device of the present utility model;

[0017] Figure 2 is a schematic diagram of the battery internal pressure monitoring device of the present utility model without the top seat;

[0018] Figure 3 is an internal schematic diagram of a battery internal pressure monitoring device of the present utility model.

[0019] In the drawings:

[0020] 1, container; 2, pressure sensor; 3, first electrode; 4, second electrode; 5, top seat; 6, base; 7, first cavity; 8, second cavity; 9, telescopic member; 10, first wire; 11, second wire; 12, external thread; 13, connection port. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "lateral", "vertical", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and does not indicate or imply that the device or component referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0023] As Figures 1 to 3 shown, there is shown a battery internal pressure monitoring device of a preferred embodiment, including: a container 1, a pressure sensor 2, a first electrode 3, and a second electrode 4. An installation cavity is formed in the container 1. The first electrode 3 is arranged at the upper part of the installation cavity, the second electrode 4 is arranged at the lower part of the installation cavity, and the pressure sensor 2 is arranged in the installation cavity. The pressure sensor 2 is used to monitor the air pressure change in the container 1. Further, when it is necessary to monitor the internal pressure of a cylindrical battery, first open the container 1, install the winding core of the cylindrical battery in the container 1, and inject a certain amount of electrolyte, and then close the container 1. At this time, the first electrode 3 and the second electrode 4 are respectively in contact with the upper end and the lower end of the winding core. At this time, the internal pressure monitoring work can be carried out through the feedback of the pressure sensor 2, and then the recorded and analyzed data through the feedback is conducive to subsequent safety performance evaluation, explosion-proof valve design, and material and electrolyte design, etc.

[0024] Further, as a preferred embodiment, the container 1 is preferably arranged in a hollow cylindrical structure.

[0025] Further, as a preferred embodiment, the container 1 includes: a top seat 5 and a bottom seat 6. The top seat 5 is detachably installed at the upper end of the bottom seat 6, and an installation cavity is formed between the top seat 5 and the bottom seat 6.

[0026] Further, as a preferred embodiment, both the top seat 5 and the bottom seat 6 are preferably arranged in a shell structure.

[0027] Further, as a preferred embodiment, the top seat 5 and the bottom seat 6 are preferably made of stainless steel material.

[0028] Further, as a preferred embodiment, a first cavity 7 is formed in the top seat 5, a second cavity 8 is formed in the bottom seat 6, and the first cavity 7 and the second cavity 8 together form an installation cavity.

[0029] Further, as a preferred embodiment, the pressure sensor 2 and the first electrode 3 are both disposed within the first cavity 7, and the second electrode 4 is disposed within the second cavity 8.

[0030] Further, as a preferred embodiment, it further includes: a telescopic member 9, the upper end of the telescopic member 9 is connected to the top seat 5, and the lower end of the telescopic member 9 is connected to the first electrode 3. Further, the telescopic member 9 has at least the ability to change its size in the vertical direction, so that the lower end of the telescopic member 9 can contact the upper end of the core in an adjustable manner.

[0031] Further, as a preferred embodiment, the lower end of the telescopic member 9 is movably disposed, and the first electrode 3 can stably contact the upper end of the core accordingly, and the second electrode 4 is fixedly disposed relative to the container 1.

[0032] Further, as a preferred embodiment, the telescopic member 9 is preferably a telescopic rod.

[0033] Further, as a preferred embodiment, an elastic member may preferably be disposed within the telescopic rod, and this elastic member is used for the reset of the size of the telescopic rod.

[0034] Further, as a preferred embodiment, the telescopic member 9 may also be an elastic body.

[0035] Further, as a preferred embodiment, it further includes: a first wire 10, one end of the first wire 10 is connected to the first electrode 3, a hollow channel is formed within the telescopic member 9, and the other end of the first wire 10 sequentially passes through the hollow channel and the top seat 5 and extends outward.

[0036] Further, as a preferred embodiment, it further includes: a data wire, one end of the data wire is connected to the pressure sensor 2, and the other end of the data wire sequentially passes through the hollow channel and the top seat 5 and extends outward.

[0037] Further, as a preferred embodiment, the data wire is preferably used to connect to a corresponding test recording device.

[0038] Further, as a preferred embodiment, the telescopic member 9 passes through the pressure sensor 2.

[0039] Further, as a preferred embodiment, the outer contour of the pressure sensor 2 is preferably arranged in an annular structure.

[0040] Further, as a preferred embodiment, it further includes: a second wire 11, one end of the second wire 11 is connected to the second electrode 4, and the other end of the second wire 11 passes through the base 6 and extends outward.

[0041] Further, as a preferred embodiment, the first wire 10 and the second wire 11 are used to cooperate with the first electrode 3 and the second electrode 4 to form an electrical connection path with the core, and are connected to an external test device.

[0042] The above are only preferred embodiments of the present utility model, and do not limit the implementation manners and protection scope of the present utility model accordingly.

[0043] The present utility model further has the following implementation manners on the above basis:

[0044] In a further embodiment of the present utility model, the top seat 5 and the base seat 6 are threadedly connected.

[0045] In a further embodiment of the present utility model, preferably, an external thread 12 is provided at the upper end of the base seat 6, and an internal thread matching the external thread 12 is provided inside the lower part of the top seat 5.

[0046] In a further embodiment of the present utility model, an interface 13 extends upward from the upper end of the top seat 5. Further, the first wire 10 and the data wire are sequentially arranged through the hollow channel, the top seat 5, and the interface 13.

[0047] In a further embodiment of the present utility model, a support ring extends radially outward from the lower end of the base seat 6 for easy placement.

[0048] In a further embodiment of the present utility model, the first electrode 3 and the second electrode 4 are preferably arranged in a disc-shaped structure.

[0049] In a further embodiment of the present utility model, the diameter of the first electrode 3 is preferably 40 mm to 44 mm.

[0050] In a further embodiment of the present utility model, the diameter of the second electrode 4 is preferably 40 mm to 46 mm.

[0051] In a further embodiment of the present utility model, the outer diameter of the pressure sensor 2 is preferably 44 mm to 46 mm.

[0052] The above are only preferred embodiments of the present utility model, and do not limit the implementation manners and protection scope of the present utility model accordingly. For those skilled in the art, it should be realized that all equivalent replacements and obvious changes made by using the description and illustrations of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A battery internal pressure monitoring device, characterized in that: include: A container, a pressure sensor, a first electrode and a second electrode, wherein an installation cavity is formed in the container, the first electrode is arranged at the upper part of the installation cavity, the second electrode is arranged at the lower part of the installation cavity, the pressure sensor is arranged in the installation cavity, and the pressure sensor is used to monitor the air pressure change in the container.

2. The battery internal pressure monitoring device according to claim 1, characterized in that: The container comprises: a top seat and a base, wherein the top seat is detachably mounted on the upper end of the base, and the mounting cavity is formed between the top seat and the base.

3. The battery internal pressure monitoring device according to claim 2, characterized in that: A first cavity is formed in the top seat, a second cavity is formed in the base, and the first cavity and the second cavity together form the installation cavity.

4. The battery internal pressure monitoring device according to claim 3, characterized in that: The pressure sensor and the first electrode are both disposed in the first cavity, and the second electrode is disposed in the second cavity.

5. The battery internal pressure monitoring device according to claim 2, characterized in that: Also includes: A telescopic component, wherein the upper end of the telescopic component is connected to the top seat, and the lower end of the telescopic component is connected to the first electrode.

6. The battery internal pressure monitoring device according to claim 5, characterized in that: Also includes: A first wire, one end of which is connected to the first electrode, a hollow channel is provided in the telescopic component, and the other end of the first wire passes through the hollow channel and the top seat in sequence and extends outward.

7. The battery internal pressure monitoring device according to claim 6, characterized in that: Also includes: A data wire, one end of which is connected to the pressure sensor, and the other end of which passes through the hollow channel and the top seat in sequence and extends outward.

8. The battery internal pressure monitoring device according to claim 5, characterized in that: The telescopic component is disposed through the pressure sensor.

9. The battery internal pressure monitoring device according to claim 2, characterized in that: Also includes: A second wire, one end of which is connected to the second electrode, and the other end of which passes through the base and extends outward.

10. The battery internal pressure monitoring device according to claim 2, characterized in that: The top seat is connected to the base via threads.

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