Auxiliary device for testing volume change of battery cell performance

Abstract

The utility model discloses a kind of auxiliary equipment of battery performance test volume change, including the box with containing cavity, the box is made of transparent material, and existing technology is different, front through-hole and rear through-hole are opened on the box, and the containing cavity is communicated with;One end of battery is arranged on front through-hole, the other end of battery is arranged on rear through-hole, the middle part of battery is located in the containing cavity, and sealed cavity is formed between battery and the box;Detection liquid soaked in battery is arranged in the sealed cavity, and the positive pole and negative pole of battery are located outside the box.The utility model battery and box form sealed cavity, the liquid level of detection liquid in sealed cavity can indirectly calculate the expansion degree of battery, further, since the positive pole and negative pole of battery are located outside the box, then detection liquid can be conductive liquid.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery testing technology, and in particular to an auxiliary device for testing the volume change of battery cell performance. Background Technology

[0002] Currently, lithium battery technology is developing rapidly and has become the mainstream power source for new energy vehicles. Its high energy density, long cycle life, and fast charging capability significantly improve the driving range and ease of use of electric vehicles. In recent years, relevant standards for lithium battery testing have become increasingly comprehensive and complete, requiring all-round data testing of the cells. Currently, conventional equipment lacks effective methods for recording dynamic volume changes during cell testing.

[0003] A search revealed that a Chinese patent with authorization announcement number CN208887726U and titled "A Monitoring Device for Battery Volume Change" discloses a method of placing a battery in a sealed test chamber containing a non-conductive liquid and then judging the volume change of the battery by the change in liquid level. The drawback of this technology is that if the battery leaks, a short circuit will occur in the battery located in the liquid because the electrolyte is conductive, resulting in poor detection results. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes an auxiliary device for testing the volume change of battery cell performance.

[0005] This utility model proposes an auxiliary device for testing the volume change of battery cell performance, comprising a housing with a receiving cavity, the housing being made of a transparent material. Unlike existing technologies, the housing has a front through-hole and a rear through-hole that are opposite to and communicate with the receiving cavity; one end of the battery cell is located in the front through-hole, the other end of the battery cell is located in the rear through-hole, the middle portion of the battery cell is located in the receiving cavity, and a sealed cavity is formed between the battery cell and the housing.

[0006] The sealed cavity contains a testing solution that has been immersed in the battery cell, and the positive and negative terminals of the battery cell are located outside the housing. Since conventional battery cell rings are waterproof, liquid water is preferred as the testing solution. For high-temperature testing, high-temperature resistant liquids such as ethylene glycol can be used.

[0007] Specifically, the battery cell is a casing battery cell, with both ends of the battery cell casing mounted on the front and rear through holes. The positive and negative electrodes of the battery cell are exposed outside the casing, and the middle part of the battery cell is located inside the sealed cavity. The expansion degree of the battery cell can be indirectly detected by observing the change in the liquid level of the detection liquid inside the sealed cavity, and the detection liquid can be a conductive liquid.

[0008] Preferably, the enclosure is equipped with an explosion-proof valve. When an abnormality occurs during cell testing and the pressure within the sealed cavity cannot be balanced, the explosion-proof valve releases pressure promptly when it reaches a certain level, preventing equipment damage. Specifically, the explosion-proof valve can be an explosion-proof disc.

[0009] Preferably, the housing is equipped with a liquid level detection device for detecting the liquid level height inside the sealed cavity.

[0010] By setting up a liquid level detection device, the liquid level height of the detection liquid in the sealed cavity can be monitored in real time.

[0011] Preferably, the liquid level detection element is an ultrasonic liquid level gauge.

[0012] Ultrasonic level gauges can measure changes in liquid level without contact with the liquid and are compatible with various liquids.

[0013] Preferably, the front through hole and the rear through hole are circular or square.

[0014] Different front and rear through holes can be designed according to different cell shapes.

[0015] Preferably, both the front through hole and the rear through hole are provided with elastic rings. When the battery cell is fitted inside the elastic ring, the elastic ring is in a compressed state. The elastic ring can be a rubber ring. The setting of the elastic ring can ensure the sealing between the battery cell and the housing, and at the same time achieve the technical effect of clamping both ends of the battery cell, preventing the battery cell from moving relative to the housing during the testing process.

[0016] Preferably, the housing is provided with a one-way exhaust valve, so that when the battery cell expands, the gas inside the housing is discharged through the one-way exhaust valve.

[0017] When the pressure change inside the sealed cavity is small, the gas inside the sealed cavity can be discharged through the one-way exhaust valve to balance the pressure. Since the one-way exhaust valve has a small contact area with the outside, it can effectively avoid test errors caused by liquid evaporation and improve the accuracy of volume change measurement.

[0018] Preferably, the bottom of the housing is provided with a pipe communicating with the sealed cavity, through which liquid enters or exits the sealed cavity.

[0019] The pipeline is equipped with valves, which facilitates the introduction or removal of the test liquid within the sealed cavity.

[0020] Preferably, the housing is equipped with a conductivity sensor for detecting the conductivity of the test liquid inside the housing, and the data detected by the conductivity sensor is used to determine whether the battery cell is leaking.

[0021] If electrolyte leakage occurs, the conductivity detected by the conductivity sensor will change, allowing users to determine whether leakage has occurred.

[0022] Preferably, the housing is equipped with a temperature sensor for detecting the temperature of the detection liquid inside the housing.

[0023] If the battery cell generates heat abnormally, the abnormal changes in the data detected by the temperature sensor will allow users to take timely measures.

[0024] In this invention, the proposed auxiliary device for testing the volume change of battery cell performance has a sealed cavity formed by the battery cell and the housing. The expansion degree of the battery cell can be indirectly calculated by the liquid level of the detection liquid in the sealed cavity. Furthermore, since the positive and negative electrodes of the battery cell are located outside the housing, the detection liquid can be a conductive liquid. Furthermore, the setting of a conductive sensor can determine whether the battery cell is leaking.

[0025] Additional aspects and advantages of this 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

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] In the diagram: 1. Housing; 2. Explosion-proof valve; 3. Liquid level detection device; 4. One-way vent valve; 5. Front through hole; 6. Rear through hole; 7. Pipeline; 8. Conductivity sensor; 9. Temperature sensor; 10. Elastic ring. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols 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 are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] like Figure 1 An auxiliary device for measuring volume change in battery cell performance testing is shown, comprising a housing 1 with a receiving cavity. The housing 1 is made of a transparent material, specifically glass or transparent plastic, to facilitate observation of changes in the battery cell during testing. A transverse front through hole 5 is opened on the first side of the housing 1, and a transverse rear through hole 6 is opened on the second side of the housing 1. The front through hole 5 and the rear through hole 6 are opposite to each other and communicate with the receiving cavity. The battery cell is transversely arranged on the housing 1, with one end of the battery cell located on the front through hole 5 and the other end of the battery cell located on the rear through hole 6. The ends of the battery cell seal the front through hole 5 and the rear through hole 6, and the middle part of the battery cell is located in the receiving cavity, forming a sealed cavity between the battery cell and the housing 1.

[0030] The sealed cavity contains a test solution that covers the battery cell, with the positive and negative terminals of the battery cell located outside the housing 1. Since the surface of a conventional battery cell is waterproof, liquid water is preferred as the test solution; however, for high-temperature testing, heat-resistant liquids such as ethylene glycol can be used.

[0031] Specifically, the battery cell is a casing battery cell. The two ends of the battery cell casing are installed on the front through hole 5 and the rear through hole 6. The positive and negative electrodes of the battery cell are exposed outside the housing 1. The middle part of the battery cell is located in the sealed cavity. The expansion degree of the battery cell can be indirectly detected by observing the change in the liquid level of the detection liquid in the sealed cavity. The detection liquid can be a conductive liquid.

[0032] Preferably, the housing 1 is equipped with an explosion-proof valve 2. When an abnormality occurs during the cell testing process and the pressure inside the sealed cavity cannot be balanced, the explosion-proof valve 2 releases the pressure in a timely manner when the pressure reaches a certain level, preventing equipment damage. Specifically, the explosion-proof valve 2 can be an explosion-proof disc.

[0033] Preferably, the housing 1 is equipped with a liquid level detection element 3 for detecting the liquid level in the sealed cavity. The liquid level detection element 3 allows for real-time monitoring of the liquid level in the sealed cavity.

[0034] Preferably, the level detection element 3 is an ultrasonic level gauge. The ultrasonic level gauge can measure level changes without contact with the liquid and is compatible with various liquids.

[0035] Preferably, the front through hole 5 and the rear through hole 6 are circular or square. Different front through holes 5 and rear through holes 6 can be designed according to different shaped battery cells, and different sizes of front through holes 5 and rear through holes 6 can be opened according to different sized battery cells.

[0036] Preferably, both the front through hole 5 and the rear through hole 6 are provided with elastic rings 10. When the battery cell is fitted inside the elastic ring 10, the elastic ring 10 is in a compressed state. The elastic ring 10 can be a rubber ring. The setting of the elastic ring 10 can ensure the sealing between the battery cell and the housing 1, and at the same time achieve the technical effect of clamping both ends of the battery cell, preventing the battery cell from moving relative to the housing 1 during the testing process.

[0037] Preferably, the housing 1 is provided with a one-way exhaust valve 4, so that when the volume of the battery cell expands, the gas inside the housing 1 is discharged through the one-way exhaust valve 4.

[0038] When the pressure change inside the sealed cavity is small, the gas inside the sealed cavity can be discharged through the one-way exhaust valve 4 to balance the pressure. Since the one-way exhaust valve 4 has a small contact area with the outside, it can effectively avoid test errors caused by liquid evaporation and improve the accuracy of volume change measurement.

[0039] Preferably, the bottom of the housing 1 is provided with a pipe 7 that communicates with the sealed cavity, through which liquid enters or exits the sealed cavity.

[0040] The pipe 7 is equipped with a valve, which facilitates the introduction or removal of the test liquid within the sealed cavity.

[0041] Preferably, the housing 1 is equipped with a conductivity sensor 8 for detecting the conductivity of the test liquid inside the housing 1, and the data detected by the conductivity sensor 8 is used to determine whether the battery cell is leaking.

[0042] If electrolyte leakage occurs, the conductivity detected by the conductivity sensor 8 will change, allowing users to determine whether leakage has occurred.

[0043] Preferably, the housing 1 is equipped with a temperature sensor 9 for detecting the temperature of the detection liquid inside the housing 1.

[0044] If the battery cell generates heat abnormally, the abnormal changes in the data detected by temperature sensor 9 will allow users to take timely corresponding measures.

[0045] It should be understood that the terms "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature.

[0049] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An auxiliary device for testing the volume change of battery cell performance, comprising a housing (1) with a receiving cavity, characterized in that, The housing (1) has a front through hole (5) and a rear through hole (6) that are opposite to and communicate with the receiving cavity; one end of the battery cell is located on the front through hole (5), the other end of the battery cell is located on the rear through hole (6), the middle part of the battery cell is located in the receiving cavity, and a sealed cavity is formed between the battery cell and the housing (1); The sealed cavity contains a test solution that has been used to immerse the battery cell, and the positive and negative electrodes of the battery cell are located outside the housing (1).

2. The auxiliary equipment for measuring volume change in battery cell performance testing according to claim 1, characterized in that, An explosion-proof valve (2) is provided on the enclosure (1).

3. The auxiliary equipment for measuring volume change in battery cell performance testing according to claim 1, characterized in that, The housing (1) is equipped with a liquid level detection device (3) for detecting the liquid level in the sealed cavity.

4. The auxiliary equipment for measuring volume change in battery cell performance testing according to claim 3, characterized in that, The liquid level detection component (3) is an ultrasonic liquid level gauge.

5. The auxiliary equipment for measuring volume change in battery cell performance testing according to claim 1, characterized in that, The front through hole (5) and the rear through hole (6) are circular or square.

6. The auxiliary equipment for measuring volume change in battery cell performance testing according to claim 1, characterized in that, Both the front through hole (5) and the rear through hole (6) are provided with elastic rings (10). When the battery cell is fitted inside the elastic ring (10), the elastic ring (10) is in a compressed state.

7. The auxiliary equipment for measuring volume change in battery cell performance testing according to claim 1, characterized in that, The housing (1) is provided with a one-way exhaust valve (4). When the volume of the battery cell expands, the gas inside the housing (1) is discharged through the one-way exhaust valve (4).

8. The auxiliary equipment for measuring volume change in battery cell performance testing according to claim 1, characterized in that, The bottom of the box (1) is provided with a pipe (7) that communicates with the sealed cavity, and liquid enters or exits the sealed cavity through the pipe (7).

9. The auxiliary equipment for measuring volume change in battery cell performance testing according to claim 1, characterized in that, The housing (1) is equipped with a conductivity sensor (8) for detecting the conductivity of the detection liquid inside the housing (1). The data detected by the conductivity sensor (8) is used to determine whether the battery cell is leaking.

10. The auxiliary equipment for measuring volume change in battery cell performance testing according to claim 1, characterized in that, The housing (1) is equipped with a temperature sensor (9) for detecting the temperature of the detection liquid inside the housing (1).

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