Pressure testing device

Abstract

The application relates to a pressure testing device, the pressure testing device comprises a fixed seat, the fixed seat defines a mounting cavity and an exhaust port, the mounting cavity is used for accommodating a battery, the battery comprises a first pole and a second pole, the other end of the exhaust port is externally connected with a pressure testing meter, the fixed seat is provided with at least one conductive member, and the conductive member is connected with the first pole and the second pole. The conductive member is used for electrically abutting against one of the first pole and the second pole to form a discharge loop. According to the pressure testing device provided by the invention, the internal air pressure of the battery in the charging and discharging process can be measured by utilizing a relatively simple structure and a relatively cheap conventional pressure testing meter, so that the cost of the pressure testing device is greatly reduced, and popularization is facilitated.

Description

Technical Field

[0001] This application relates to the technical field of battery testing, and particularly to a pressure testing device. Background Art

[0002] Lithium-ion batteries are the main type of power batteries for new energy vehicles, featuring high energy density, long lifespan, and environmental friendliness. Research shows that during the formation and aging processes, a series of side reactions occur in lithium-ion batteries, generating gases that increase the internal air pressure of the battery, thus testing the battery's sealing performance. During the charge and discharge processes of lithium-ion batteries, due to the lithium deintercalation and intercalation reactions at the positive and negative electrodes, reversible changes in the volume of the electrode plates occur, leading to changes in the internal air pressure. Therefore, the air pressure change during a single charge and discharge has a strong correlation with the state of charge. Additionally, with cyclic aging, the SEI film of lithium-ion batteries continuously thickens, resulting in irreversible volume changes, which also cause changes in the internal air pressure of the battery. Therefore, the internal air pressure of lithium-ion batteries is of great significance in monitoring battery side reactions, health status, state of charge, battery leakage, battery design, and quantitatively understanding the lithium deintercalation and intercalation reactions of electrodes.

[0003] The methods for measuring the internal pressure of a battery generally include two types: destructive measurement and non-destructive measurement. In destructive measurement, a pressure sensor is usually inserted into the battery to record the pressure changes during the charge, discharge, and storage processes of the battery. Non-destructive measurement uses a sensor to measure the minute deformation of the battery housing. The strain generated in the battery housing due to the internal gas pressure is related to the magnitude of the internal pressure received, and there is a definite relationship. From this, the internal pressure of the battery can be calculated, but this method cannot monitor the actual gas generation amount of the battery during the charge and discharge processes. Utility Model Content

[0004] This application provides a pressure testing device to solve the problem that it is difficult to monitor the actual gas generation amount of the battery during the charge and discharge processes.

[0005] According to the pressure testing device of this application, it includes a fixed seat. The fixed seat defines an installation cavity and an exhaust port. The installation cavity is used to accommodate the battery. The battery includes a first pole column and a second pole column. The other end of the exhaust port is externally connected to a pressure tester. At least one conductive member is provided on the fixed seat, and the conductive member is used for electrically contacting one of the first pole column and the second pole column to form a discharge circuit.

[0006] According to the pressure testing device of this application, one conductive member is provided on the fixed seat. At least a part of the conductive member is exposed in the installation cavity. An avoidance opening is provided on the fixed seat, and the avoidance opening is used to avoid one of the first pole column and the second pole column. The conductive member is used for electrically contacting the other one of the first pole column and the second pole column.

[0007] Optionally, a limiting hole is provided on the fixing base. The limiting hole communicates with the installation cavity. The conductive member is clamped in the limiting hole. The conductive member includes opposite first and second ends. At least part of the first end is exposed in the installation cavity, and the second end protrudes from the outer wall surface of the fixing base.

[0008] Optionally, the first end is flush with the inner wall of the installation cavity.

[0009] Optionally, the conductive member is configured to be cylindrical, and the cross-section of the conductive member in the radial direction is circular or elliptical.

[0010] Optionally, an insulating layer is provided between the conductive member and the inner wall of the limiting hole.

[0011] Optionally, a first limiting portion is provided on the conductive member, and a second limiting portion is provided on the fixing base. The first limiting portion and the second limiting portion are clamped together.

[0012] According to the pressure testing device of the present application, the fixing base includes a first housing and a second housing that are detachably connected. The first housing defines an installation cavity and an exhaust port. The second housing is disposed opposite to the installation cavity to limit the battery.

[0013] Optionally, an installation groove is further provided in the installation cavity. The installation groove is used to clamp a sealing ring. When the battery is installed in the installation cavity, the sealing ring is sleeved on the battery.

[0014] Optionally, the number of the installation grooves is multiple, and the multiple installation grooves are spaced along the axial direction of the installation cavity.

[0015] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0016] The pressure testing device provided by the embodiment of the present application, when used to measure the airtightness of a battery, breaks the negative or positive terminal of the battery to release the internal gas and enable the gas generated inside the battery to escape at any time. The battery is placed in the installation cavity, and the broken end of the battery is close to the exhaust port. When there are two conductive parts on the fixing seat, the battery is in electrical contact with both conductive parts when in the installation cavity, and then the two conductive parts can be respectively connected to a power-consuming part or a charging part through an external wire to form a discharging or charging circuit. When there is one conductive part on the fixing seat, one of the first pole and the second pole is electrically connected to the conductive part, and the other is directly connected to the power-consuming part or the charging part and the conductive part through an external wire to form a discharging or charging circuit. One end of the exhaust port is connected to a pressure tester, so that the air pressure can be detected by an external pressure tester as an indication of the internal air pressure of the battery during charging and discharging. Therefore, the internal air pressure of the battery during charging and discharging can be measured by using a relatively simple structure and a relatively inexpensive conventional pressure tester, greatly reducing the cost of the pressure testing device and facilitating its popularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present utility model and, together with the specification, are used to explain the principles of the present utility model.

[0018] To more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] One or more embodiments are exemplarily illustrated by the pictures in the corresponding accompanying drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the figures do not constitute a proportional limitation.

[0020] Figure 1 A perspective view of a pressure testing device provided by the embodiment of the present application;

[0021] Figure 2 A sectional view of a pressure testing device provided by the embodiment of the present application;

[0022] Figure 3 A side view of a pressure testing device provided by the embodiment of the present application.

[0023] Description of the reference numerals in the drawings:

[0024] Fixed seat 10, installation cavity 11, exhaust port 12, limiting hole 13, first housing 15, guiding hole 151, second housing 16, guiding column 161, installation groove 17, conductive member 30. Detailed implementation manner

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0026] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0027] For ease of description, spatially relative relationship terms may be used in the text to describe the relative positional relationship or movement of one element or feature shown in the figure with respect to another element or feature. These relative relationship terms are, for example, "inner", "outer", "inner side", "outer side", "below", "beneath", "above", "upper", "front", "rear", etc. Such spatially relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position reversal, posture change, or movement state change, then these directional indications will change accordingly. For example, an element described as "below" or "beneath" another element or feature will then be oriented as "above" or "over" another element or feature. Therefore, the example term "below" can include both the upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or in other directions) and the spatially relative relationship descriptors used in the text are interpreted accordingly.

[0028] Such as Figure 1 And Figure 2As shown in the figure, the pressure testing device according to an embodiment of the present application includes a fixed seat 10. The fixed seat 10 defines an installation cavity 11 and an exhaust port 12. The installation cavity 11 is used to accommodate a battery. The battery includes a first pole column and a second pole column. The other end of the exhaust port 12 is externally connected to a pressure tester. At least one conductive member 30 is provided on the fixed seat 10. The conductive member 30 is used to electrically contact one of the first pole column and the second pole column to form a discharge circuit.

[0029] Specifically, when the pressure testing device is used to measure the airtightness of the battery, the negative terminal or the positive terminal of the battery is broken open to release the internal gas and enable the gas generated inside the battery to escape at any time. The battery is placed in the installation cavity 11, and the broken-open end of the battery is close to the exhaust port 12. When two conductive members 30 are provided on the fixed seat 10, the battery is in electrical contact with both conductive members 30 when in the installation cavity 11. Then, the two conductive members 30 can be respectively connected to a power-consuming member or a charging member through external wires to form a discharge or charging circuit. When only one conductive member 30 is provided on the fixed seat 10, one of the first pole column and the second pole column is electrically connected to the conductive member 30, and the other is directly connected to a power-consuming member or a charging member and the conductive member 30 through external wires to form a discharge or charging circuit. One end of the exhaust port 12 is connected to the pressure tester.

[0030] Wherein, one of the first pole column and the second pole column is the positive pole column, and the other is the negative pole column. That is to say, in some embodiments, the first pole column is the positive pole column and the second pole column is the negative pole column. In some embodiments, the first pole column is the negative pole column and the second pole column is the positive pole column.

[0031] The pressure testing device according to an embodiment of the present application can detect the air pressure through an external pressure tester as an indication of the internal air pressure of the battery during charging and discharging. Thus, the measurement of the internal air pressure of the battery during charging and discharging can be realized by using a relatively simple structure and a relatively inexpensive conventional pressure tester, greatly reducing the cost of the pressure testing device and facilitating its promotion.

[0032] As Figure 1 and Figure 2 As shown in the figure, for the pressure testing device according to an embodiment of the present application, one conductive member 30 is provided on the fixed seat 10, and at least a part of the conductive member 30 is exposed in the installation cavity 11. An avoidance opening is provided on the fixed seat 10. The avoidance opening is used to avoid one of the first pole column and the second pole column. The conductive member 30 is used to electrically contact the other of the first pole column and the second pole column.

[0033] Specifically, a conductive member 30 is provided on the fixing base 10, and at least a part of the conductive member 30 is exposed in the installation cavity 11. An avoidance opening is provided on the fixing base 10 for avoiding one of the first pole column and the second pole column. The conductive member 30 is used for electrically abutting against the other of the first pole column and the second pole column. That is to say, when the battery is installed in the installation cavity 11, when the first pole column of the battery faces the avoidance opening, the second pole column of the battery faces the conductive member 30; when the second pole column of the battery faces the avoidance opening, the first pole column of the battery faces the conductive member 30.

[0034] Among them, the first pole column can protrude from the inner wall of the installation cavity 11 or be flush with the inner wall of the installation cavity 11.

[0035] Such as Figure 1 and Figure 2 As shown in the figure, in some embodiments, a limiting hole 13 is provided on the fixing base 10. The limiting hole 13 is communicated with the installation cavity 11. The conductive member 30 is clamped in the limiting hole 13. The conductive member 30 includes opposite first end and second end. At least a part of the first end is exposed in the installation cavity 11, and the second end protrudes from the outer wall surface of the fixing base 10.

[0036] Specifically, a limiting hole 13 is provided on the fixing base 10. The limiting hole 13 is communicated with the installation cavity 11. The conductive member 30 is clamped in the limiting hole 13. The conductive member 30 includes opposite first end and second end. The second end protrudes from the outer wall surface of the fixing base 10.

[0037] Among them, the cross-sectional shape of the limiting hole 13 includes but is not limited to circular, oval, triangular, rectangular, square, etc.

[0038] In some embodiments, the first end is flush with the inner wall of the installation cavity 11. In this way, it is beneficial to the installation and fixation of the battery in the installation cavity 11, not easy to shake, easy to maintain balance, beneficial to reducing the overall volume and size of the installation cavity 11, and further reducing the overall volume and size of the fixing base 10, so as to further reduce the overall production cost of the fixing base 10.

[0039] In some embodiments, the conductive member 30 is configured as a cylindrical shape, and the cross-section of the conductive member 30 in the radial direction is circular or oval.

[0040] Specifically, the conductive member 30 is configured as a cylindrical shape, and the cross-section of the conductive member 30 in the radial direction is circular or oval. In this way, while ensuring the contact area between the conductive member 30 and the first pole column or the second pole column, the structural setting of the conductive member 30 can be simplified, which is beneficial to the conductive member 30 being inserted into the limiting hole 13.

[0041] In some embodiments, there is an insulating layer between the conductive member 30 and the inner wall of the limiting hole 13.

[0042] Specifically, there is an insulating layer between the conductive member 30 and the inner wall of the limiting hole 13. When the fixing base 10 is made of a conductive metal material, the insulating layer can prevent electric leakage, which is beneficial to increasing the variety of materials for making the fixing base 10.

[0043] In some embodiments, a first limiting portion is provided on the conductive member 30, and a second limiting portion is provided on the fixing base 10, and the first limiting portion and the second limiting portion are snap-connected.

[0044] Specifically, a first limiting portion is provided on the conductive member 30, a second limiting portion is provided on the fixing base 10, and the first limiting portion and the second limiting portion are snap-connected, which can limit and fix the conductive member 30.

[0045] Among them, the first limiting portion is configured as a limiting groove, and the second limiting portion is configured as a limiting protrusion; the first limiting portion is configured as a limiting protrusion, and the second limiting portion is configured as a limiting groove.

[0046] As Figure 1 and Figure 3 shown, according to the pressure testing device of the embodiment of the present application, the fixing base 10 includes a first housing 15 and a second housing 16 that are detachably connected. The first housing 15 defines an installation cavity 11 and an exhaust port 12, and the second housing 16 is disposed opposite to the installation cavity 11 to limit the battery.

[0047] When the pressure testing device is used to measure the airtightness of the battery, the positive electrode end of the battery is broken to release the internal gas and enable the gas generated inside the battery to escape at any time. The battery is placed in the installation cavity 11, and the broken end of the battery is close to the exhaust port 12. The installation groove 17 is used for sealing, and the second housing 16 is used to fix and limit the battery, so that the gas generated inside the battery escapes through the broken end.

[0048] It can be understood that the first housing 15 and the second housing 16 are detachably connected, which can facilitate the fixing and removal of the battery. The first housing 15 and the second housing 16 can be snap-connected and thread-connected, etc., which is not limited in the present application.

[0049] As Figure 2 shown, in some embodiments, an installation groove 17 is further provided in the installation cavity 11. The installation groove 17 is used for clamping a sealing ring. When the battery is installed in the installation cavity 11, the sealing ring is sleeved on the battery. The sealing ring can play a sealing role, so that the gas generated after the battery is broken can escape to the first chamber through the broken end, avoiding leakage, thereby improving the detection accuracy of the pressure tester.

[0050] In some embodiments, the number of the installation grooves 17 is multiple, and the multiple installation grooves 17 are distributed at intervals along the axial direction of the installation cavity 11.

[0051] Specifically, the number of the installation grooves 17 is multiple, and a sealing ring is embedded in each installation groove 17. The sealing ring is used to sleeve the battery. By using the sealing ring, the space between the battery and the inner wall of the installation cavity 11 can be sealed in the circumferential direction of the battery, improving the sealing performance of the installation cavity 11 for the battery and enabling the result of the pressure tester to be more accurate.

[0052] It can be understood that adding sealing rings can increase the sealing performance of the pressure testing device, but too many sealing rings will also increase the difficulty of installing the battery. Therefore, a reasonable number of sealing rings needs to be set. When there are multiple sealing rings, the multiple sealing rings are distributed at intervals along the axial direction of the battery, and the multiple installation grooves 17 are distributed at intervals along the axial direction of the installation cavity 11, thereby further ensuring the sealing performance of the pressure testing device.

[0053] The sealing ring can be made of various materials, such as silica gel, rubber, and Teflon. Since the electrolyte volatilized from the battery is corrosive to the rubber ring, which will affect the sealing effect of the sealing ring and further affect the accuracy of the air pressure test result. In some embodiments, the sealing ring is made of Teflon. Due to its excellent corrosion resistance, it can effectively avoid the corrosion caused by the volatilization of the electrolyte and ensure the sealing performance of the pressure testing device within a certain service life.

[0054] As Figure 2 shown, in the pressure testing device according to the embodiment of the present application, a guiding post 161 is provided on one of the first housing 15 and the second housing 16, and a guiding hole 151 is provided on the other one. The guiding post 161 passes through the guiding hole 151.

[0055] In the pressure testing device according to the embodiment of the present application, the guiding post 161 passes through the guiding hole 151. Thus, by the cooperation of the guiding hole 151 and the guiding post 161, the first housing 15 and the second housing 16 are positioned and limited, ensuring that the first housing 15 and the second housing 16 can be aligned at the set positions when being fastened, thereby reducing the difficulty of connecting the first housing 15 and the second housing 16 after being accurately aligned.

[0056] Among them, a guiding post 161 is provided on one of the first housing 15 and the second housing 16, and a guiding hole 151 is provided on the other one. It can be that the guiding post 161 is provided on the first housing 15 and the guiding hole 151 is provided on the second housing 16; it can also be that the guiding hole 151 is provided on the first housing 15 and the guiding post 161 is provided on the second housing 16.

[0057] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless an execution order is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0058] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms when used herein do not imply an order or sequence. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0059] The above are only the specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A pressure testing device, characterized in that, It includes a fixed seat which defines an installation cavity and an exhaust port. The installation cavity is used to accommodate a battery. The battery includes a first pole and a second pole. The other end of the exhaust port is externally connected to a pressure tester. At least one conductive member is provided on the fixed seat, and the conductive member is used to electrically contact one of the first pole and the second pole to form a discharge circuit.

2. The pressure testing device according to claim 1, characterized in that, One conductive member is provided on the fixed seat, and at least part of the conductive member is exposed in the installation cavity. An avoidance opening is provided on the fixed seat, and the avoidance opening is used to avoid one of the first pole and the second pole. The conductive member is used to electrically contact the other one of the first pole and the second pole.

3. The pressure testing device according to claim 2, wherein A limiting hole is provided on the fixed seat, and the limiting hole communicates with the installation cavity. The conductive member is clamped in the limiting hole. The conductive member includes opposite first and second ends. At least part of the first end is exposed in the installation cavity, and the second end protrudes from the outer wall surface of the fixed seat.

4. The pressure testing device according to claim 3, characterized in that, The first end is flush with the inner wall of the installation cavity.

5. The pressure testing device according to claim 4, wherein, The conductive member is configured to be cylindrical, and the cross-section of the conductive member in the radial direction is circular or elliptical.

6. The pressure testing device according to claim 4, wherein, There is an insulating layer between the conductive member and the inner wall of the limiting hole.

7. The pressure testing device according to claim 4, characterized in that A first limiting portion is provided on the conductive member, and a second limiting portion is provided on the fixed seat. The first limiting portion and the second limiting portion are clamped together.

8. The pressure testing device according to any one of claims 1-7, characterized in that, The fixed seat includes a first housing and a second housing that are detachably connected. The first housing defines the installation cavity and the exhaust port. The second housing is disposed opposite to the installation cavity to limit the battery.

9. The pressure testing device according to claim 8, wherein An installation groove is further provided in the installation cavity. The installation groove is used to clamp a sealing ring. When the battery is installed in the installation cavity, the sealing ring is sleeved on the battery.

10. The pressure testing device according to claim 9, wherein The number of the installation grooves is multiple, and the multiple installation grooves are spaced apart along the axial direction of the installation cavity.

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