Soft package lithium ion battery testing device convenient for multi-signal monitoring

Abstract

The utility model discloses a soft package lithium ion battery testing device convenient for multi-signal monitoring, and particularly relates to the field of lithium ion soft package batteries, which comprises a bottom layer base, a lithium ion battery main body is arranged above the bottom layer base, and heat conduction soft silica gel is arranged at the upper end and the lower end of the lithium ion battery main body. According to the utility model, the support base is combined with the double-thread screw to fix the lithium ion battery, so that the lithium ion battery can be connected with existing charging and discharging equipment in the market, and voltage and current monitoring of a lithium battery main body under various working conditions can be realized while normal charging and discharging of the battery are ensured; on one hand, the pre-tightening force applied by the screw is controlled, the influence of the pre-tightening force on the battery performance during actual battery grouping is better known, the method is convenient and efficient, and the adjustment of the pre-tightening force in a laboratory is easy to operate; on the other hand, the stress change is monitored in real time through the micro force transducer; a temperature sensor can be placed on the surface of the battery according to requirements to monitor temperature.

Description

Technical Field

[0001] The utility model relates to the field of lithium-ion soft-pack batteries, and more specifically, to a soft-pack lithium-ion battery testing device that is convenient for multi-signal monitoring. Background Art

[0002] In recent years, rechargeable lithium-ion batteries have become the preferred power source in many fields due to their high energy and power density, reliability, robustness, and long cycle life. Their anodes, cathodes, and electrolytes have different chemical properties, so laboratories often conduct performance tests on their most important characteristics, such as rate capability, high and low temperature performance, and short-circuit safety. Regarding the physical behavior of lithium batteries, we often focus on voltage, current, temperature, and the gas stress generated by the chemical reactions in lithium batteries.

[0003] Currently, most laboratories test the performance of lithium batteries without using restraint forces. In actual practice, batteries need to withstand a certain amount of compression during assembly, so reliable and adjustable fixtures are required for lithium battery testing. Furthermore, whether the force applied to the battery cell installation position is uniform and reasonable will also cause uneven reactions within the battery, leading to unreliable performance test results. Therefore, to address this issue, a thermally conductive soft silicone plate needs to be placed above and below the battery before the force is applied. The flexibility of the silicone plate ensures that the battery cell and temperature sensor positions are properly positioned during installation, preventing the battery from detaching from the fixture due to operational errors. Furthermore, most operators use aluminum plates as the fixture material, indirectly acting as heat sinks. This can cause the measured temperature signal to deviate significantly from the actual result, making the test results unreliable.

[0004] Lithium battery signal monitoring has always been the most fundamental signal source for battery structural modification, battery life prediction, and battery early warning. Therefore, laboratory testing of lithium batteries requires monitoring of multiple signals. However, currently, most laboratories use commonly used test products, and battery fixtures for this method are generally provided separately. Therefore, we need to design a device that can integrate multi-signal battery detection and connect to existing charging and discharging equipment on the market. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide a soft-pack lithium-ion battery testing device that facilitates multi-signal monitoring, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a soft-pack lithium-ion battery testing device that is convenient for multi-signal monitoring, comprising a bottom base, a lithium-ion battery body is placed above the bottom base, thermally conductive soft silicone is placed at both the upper and lower ends of the lithium-ion battery body, a double-headed screw is passed through the interior of the thermally conductive soft silicone and the bottom base, an upper base is provided on the outer wall of the double-headed screw and located above the thermally conductive soft silicone, a nut is threadedly connected to the outer wall of the double-headed screw, a stress sensor is placed at the bottom end of the upper base, and the stress sensor is placed at the bottom end of the upper base. A movable insulator is placed at the bottom end of the force sensor and at the top end of the thermally conductive soft silicone. A temperature sensor is provided on the contact surface between the thermally conductive soft silicone and the lithium-ion battery body. A voltage collection point is provided on the side of the lithium-ion battery body. A current collection point is provided on the top end of the bottom base. A cylindrical head screw with a shoulder height limit is provided on the top end of the bottom base. A contact conductor is fixedly connected to the outer wall of the cylindrical head screw with a shoulder height limit. A connecting rod structure is slidably connected to the outer wall of the cylindrical head screw with a shoulder height limit. The connecting rod structure includes a connecting plate.

[0007] Preferably, the connecting rod structure further includes a support plate, a control handle, a connecting rod, a connecting block, a pull rod, a pressure plate, a slider and a slide rail;

[0008] Preferably, the top end of the shoulder height limit cylindrical head screw is fixedly connected to a connecting plate, the top end of the connecting plate is fixedly connected to a support plate, the side wall of the support plate is screwed to a control handle, the side wall of the control handle is screwed to a connecting rod, one side of the connecting rod is screwed to a connecting block, the bottom end of the connecting block is fixedly connected to a pull rod passing through the inside of the connecting plate, the bottom end of the pull rod is fixedly connected to a pressure plate slidably connected to the outer wall of the shoulder height limit cylindrical head screw, the outer wall of the pull rod is fixedly connected to a slider, and the side wall of the support plate is fixedly connected to a slide rail.

[0009] Preferably, the bottom base, the upper base and the movable insulator are all made of flame-retardant, insulating and high-hardness materials, and the double-headed screw passes through the interior of the upper base and the movable insulator.

[0010] Preferably, four groups of double-headed screws are provided, and the positions of the four groups of double-headed screws are symmetrically distributed about the center of the bottom base, and the four groups of double-headed screws are all provided with corresponding nuts.

[0011] Preferably, the control handle, connecting rod and connecting block are all made of metal, and the control handle has a 180-degree adjustment range.

[0012] Preferably, a groove matching the slide rail is formed on the side wall of the slide block, and the slide rail has a cross shape.

[0013] Preferably, the slider forms a sliding structure through a connecting rod and a slide rail.

[0014] The technical effects and advantages of this utility model are:

[0015] Compared with the existing technology, the device fixes the lithium-ion battery body through the upper base, the bottom base and the double-headed screw. At the same time, the device can be connected to the existing charging and discharging equipment on the market to ensure the normal charging and discharging of the battery while realizing the voltage and current monitoring of the lithium battery body under various working conditions; at the same time, in this process, on the one hand, the preload force applied by the screw is controlled, so as to better understand the influence of the preload force on the battery performance when the actual batteries are grouped. This method is convenient and efficient, and the adjustment of the preload force in the laboratory can be easily operated; on the other hand, the stress change is monitored in real time by the micro force sensor; the temperature can be monitored by placing a temperature sensor on the battery surface as required; this device is used as a multi-signal monitoring device, and is equipped with a digital display instrument to form a lithium-ion battery multi-physical behavior measurement system; the operation is intuitive and convenient, the overall device is stable and reliable, and the installation and operation are simple; at the same time, it provides the transfer of multiple measurement data, and can communicate with the host computer software through the relevant protocol to realize the digital display of the measurement value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main structure of the utility model.

[0017] Figure 2 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 3 This is a schematic diagram of the connecting rod structure of the utility model.

[0019] Figure 4 This is a schematic diagram of the slider and slide rail structure of the utility model.

[0020] The accompanying drawings are marked as follows: 1. bottom base; 2. lithium-ion battery body; 3. thermally conductive soft silicone; 4. double-headed screw; 5. upper base; 6. nut; 7. stress sensor; 8. movable insulator; 9. temperature sensor; 10. voltage collection point; 11. current collection point; 12. contact conductor; 13. shoulder height limit cylindrical head screw; 14. connecting rod structure; 1401. connecting plate; 1402. support plate; 1403. control handle; 1404. connecting rod; 1405. connecting block; 1406. pull rod; 1407. pressure plate; 1408. slider; 1409. slide rail. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Example 1

[0023] As attached Figures 1 to 4 The soft-pack lithium-ion battery testing device shown in the figure is convenient for multi-signal monitoring and includes a bottom base 1, a lithium-ion battery body 2 is placed on the top of the bottom base 1, and thermally conductive soft silicone rubber 3 is placed on the upper and lower ends of the lithium-ion battery body 2. A double-headed screw 4 is passed through the interior of the thermally conductive soft silicone rubber 3 and the bottom base 1, and an upper base 5 is provided on the outer wall of the double-headed screw 4 and located above the thermally conductive soft silicone rubber 3. A nut 6 is threadedly connected to the outer wall of the double-headed screw 4, and a stress sensor 7 is placed at the bottom end of the upper base 5. A movable insulator 8 is placed at the bottom end of the stress sensor 7 and at the top of the thermally conductive soft silicone rubber 3. The thermally conductive soft silicone rubber 3 and the lithium-ion battery body are connected to each other. 2 is provided with a temperature sensor 9, a voltage collection point 10 is provided on the side of the lithium-ion battery body 2, a current collection point 11 is provided on the top of the bottom base 1, and a cylindrical head screw 13 with a shaft shoulder equal height limit is provided on the top of the bottom base 1. The outer wall of the cylindrical head screw 13 with a shaft shoulder equal height limit is fixedly connected with a contact conductor 12, and the outer wall of the cylindrical head screw 13 with a shaft shoulder equal height limit is slidably connected with a connecting rod structure 14. The connecting rod structure 14 includes a connecting plate 1401. The bottom base 1, the upper base 5 and the movable insulator 8 are all made of flame retardant, insulating and high hardness materials. The double-headed screw 4 runs through the interior of the upper base 5 and the movable insulator 8.

[0024] Among them: the double-headed screw 4 is passed through the upper base 5, the movable insulator 8, the thermally conductive soft silicone 3 and the bottom base 1, and the lithium-ion battery main body 2 is fixed by screwing the nut 6. Subsequently, the pole ear and other charging and discharging products of the lithium-ion battery main body 2 are brought into contact with the contact conductor 12 through the connecting rod structure 14, while ensuring the stability of the contact between the pole ear and the contact conductor 12 of the lithium-ion battery main body 2. By controlling the tightening degree of the nut 6 on the double-headed screw 4, the influence of the preload force on the performance of the lithium-ion battery main body 2 when the actual lithium-ion battery main body 2 is grouped can be better understood. This method is convenient and efficient, and the adjustment of the preload force in the laboratory is easy to operate; the stress change is monitored in real time by the stress sensor 7, the stability of the lithium-ion battery main body 2 is monitored by the temperature sensor 9, and the voltage and current of the lithium-ion battery main body 2 under various working conditions are detected by the voltage collection point 10 and the current collection point 11.

[0025] Example 2

[0026] Based on the first embodiment, the solution in the first embodiment is further detailed in combination with the following specific working methods. Figures 1 to 4 As shown, see the following description for details: the connecting rod structure 14 also includes a support plate 1402, a control handle 1403, a connecting rod 1404, a connecting block 1405, a pull rod 1406, a pressure plate 1407, a slider 1408 and a slide rail 1409, the top of the cylindrical head screw 13 with the shaft shoulder height limit is fixedly connected to the connecting plate 1401, the top of the connecting plate 1401 is fixedly connected to the support plate 1402, the side wall of the support plate 1402 is screwed with the control handle 1403, the side wall of the control handle 1403 is screwed with the connecting rod 1404, one side of the connecting rod 1404 is screwed with a connecting block 1405, the bottom end of the connecting block 1405 is fixedly connected to the pull rod 1406 passing through the inside of the connecting plate 1401, the bottom end of the pull rod 1406 is fixedly connected to the pressure plate 1407 slidingly connected to the outer wall of the cylindrical head screw 13 with the shaft shoulder height limit, and the outer wall of the pull rod 1406 is fixedly connected to the outer wall of the cylindrical head screw 13 with the shaft shoulder height limit. The wall is fixedly connected with a slider 1408, and the side wall of the support plate 1402 is fixedly connected with a slide rail 1409; further, the control handle 1403 is turned upward, and the control handle 1403 drives the connecting rod 1404 to swing, and then drives the pull rod 1406 to move upward through the connecting block 1405, and at the same time pulls the slider 1408 to move up and down along the track of the slide rail 1409. By setting the slide rail 1409 to be a cross, the stability of the movement of the slider 1408 is guaranteed, and the pull rod 1406 can drive the pressure plate 1407 to move upward along the outer wall of the shoulder height limit cylindrical head screw 13, and then the pole ear of the lithium-ion battery main body 2 and other charging and discharging products are brought into contact with the contact conductor 12, and then the control handle 1403 is rotated in the opposite direction to ensure the stability of the contact between the pole ear of the lithium-ion battery main body 2 and the contact conductor 12, thereby playing a role in applying pressure steadily.

[0027] As a preferred embodiment, four groups of double-headed screws 4 are provided, and the positions of the four groups of double-headed screws 4 are symmetrically distributed about the center of the bottom base 1, and the four groups of double-headed screws 4 are all provided with corresponding nuts 6; further, the double-headed screws 4 are passed through the upper base 5, the movable insulator 8, the thermally conductive soft silicone 3 and the bottom base 1, and the lithium-ion battery body 2 is fixed by screwing the nuts 6. By providing four groups of double-headed screws 4 and nuts 6, it is convenient to install and fix the lithium-ion battery body 2.

[0028] As a preferred embodiment, the control handle 1403, the connecting rod 1404 and the connecting block 1405 are all made of metal, and the control handle 1403 has a 180-degree adjustment function; further, by rotating the control handle 1403, the connecting rod 1404 is driven to swing, and then the pull rod 1406 is driven to move upward through the connecting block 1405, thereby facilitating the control of the movement of the connecting block 1405.

[0029] As a preferred embodiment, the side wall of the slider 1408 is provided with a groove matching the slide rail 1409, and the shape of the slide rail 1409 is cross-shaped; further, the connecting block 1405 drives the pull rod 1406 to move upward, while pulling the slider 1408 up and down along the track of the slide rail 1409. By setting the slide rail 1409 to be cross-shaped, the stability of the movement of the slider 1408 is guaranteed.

[0030] As a preferred embodiment, the slider 1408 forms a sliding structure between the connecting rod 1404 and the slide rail 1409; further, the control handle 1403 drives the connecting rod 1404 to swing, and then drives the pull rod 1406 to move upward through the connecting block 1405, while pulling the slider 1408 up and down along the track of the slide rail 1409, and then drives the pressure plate 1407 to move upward along the outer wall of the cylindrical head screw 13 with the height limit of the shoulder, so as to achieve the purpose of controlling the movement of the pressure plate 1407.

[0031] The working process of the present invention is as follows: when using the soft-pack lithium-ion battery testing device that is convenient for multi-signal monitoring, first, it is necessary to pass the double-headed screw 4 through the upper base 5, the movable insulator 8, the thermally conductive soft silicone 3 and the bottom base 1, and fix the lithium-ion battery body 2 by screwing the nut 6. Then, screw the control handle 1403 upward, and the control handle 1403 drives the connecting rod 1404 to swing, and then drives the pull rod 1406 to move upward through the connecting block 1405, and at the same time pulls the slider 1408 to move up and down along the track of the slide rail 1409. By setting the slide rail 1409 to be cross-shaped, the stability of the movement of the slider 1408 is guaranteed, and the pull rod 1406 can drive the pressure plate 1407 along the outer edge of the cylindrical head screw 13 with the height limit of the shoulder. The wall moves upward, and then the tabs of the lithium-ion battery main body 2 and other charging and discharging products are brought into contact with the contact conductor 12, and then the control handle 1403 is rotated in the opposite direction to ensure the stability of the contact between the tabs of the lithium-ion battery main body 2 and the contact conductor 12. By controlling the tightening degree of the nut 6 on the double-headed screw 4, the influence of the pre-tightening force on the performance of the lithium-ion battery main body 2 when the actual lithium-ion battery main body 2 is grouped can be better understood. This method is convenient and efficient, and the adjustment of the pre-tightening force in the laboratory can be easily operated; the stress change is monitored in real time by the stress sensor 7, the stability of the lithium-ion battery main body 2 is monitored by the temperature sensor 9, and the voltage and current of the lithium-ion battery main body 2 under various working conditions are detected by the voltage collection point 10 and the current collection point 11.

[0032] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A soft-pack lithium-ion battery testing device convenient for multi-signal monitoring, comprising a bottom base (1), characterized in that: A lithium-ion battery body (2) is placed above the bottom base (1), and thermally conductive soft silica gel (3) is placed at both the upper and lower ends of the lithium-ion battery body (2). A double-headed screw (4) penetrates the interior of the thermally conductive soft silica gel (3) and the bottom base (1), and an upper base (5) is provided on the outer wall of the double-headed screw (4) and located above the thermally conductive soft silica gel (3). A nut (6) is threadedly connected to the outer wall of the double-headed screw (4), and a stress sensor (7) is placed at the bottom end of the upper base (5). A movable insulator (8) is placed at the bottom end of the stress sensor (7) and located at the top end of the thermally conductive soft silica gel (3). The contact surface between the thermally conductive soft silica gel (3) and the lithium-ion battery body (2) is provided with a temperature sensor (9), the side surface of the lithium-ion battery body (2) is provided with a voltage collection point (10), the top of the bottom base (1) is provided with a current collection point (11), the top of the bottom base (1) is provided with a cylindrical head screw (13) with a shaft shoulder height limit, the outer wall of the cylindrical head screw (13) with a shaft shoulder height limit is fixedly connected to a contact conductor (12), the outer wall of the cylindrical head screw (13) with a shaft shoulder height limit is slidably connected to a connecting rod structure (14), and the connecting rod structure (14) includes a connecting plate (1401).

2. The soft-pack lithium-ion battery testing device for facilitating multi-signal monitoring according to claim 1, characterized in that: The connecting rod structure (14) further comprises a support plate (1402), a control handle (1403), a connecting rod (1404), a connecting block (1405), a pull rod (1406), a pressure plate (1407), a slider (1408) and a slide rail (1409).

3. The soft-pack lithium-ion battery testing device for facilitating multi-signal monitoring according to claim 2, characterized in that: The top end of the shoulder height limiting cylindrical head screw (13) is fixedly connected to a connecting plate (1401), the top end of the connecting plate (1401) is fixedly connected to a supporting plate (1402), the side wall of the supporting plate (1402) is screwed with a control handle (1403), the side wall of the control handle (1403) is screwed with a connecting rod (1404), and one side of the connecting rod (1404) is screwed with a connecting block (1405). The bottom end of the connecting block (1405) is fixedly connected to a pull rod (1406) that passes through the inside of the connecting plate (1401), the bottom end of the pull rod (1406) is fixedly connected to a pressure plate (1407) that is slidably connected to the outer wall of the cylindrical head screw (13) with the height limit of the shoulder, the outer wall of the pull rod (1406) is fixedly connected to a slider (1408), and the side wall of the support plate (1402) is fixedly connected to a slide rail (1409).

4. The soft-pack lithium-ion battery testing device for facilitating multi-signal monitoring according to claim 1, characterized in that: The bottom base (1), the upper base (5) and the movable insulator (8) are all made of flame-retardant, insulating and high-hardness materials, and the double-headed screw (4) passes through the interior of the upper base (5) and the movable insulator (8).

5. The soft-pack lithium-ion battery testing device for facilitating multi-signal monitoring according to claim 1, characterized in that: The double-headed screw rods (4) are provided in four groups, and the positions of the four groups of double-headed screw rods (4) are symmetrically distributed about the center of the bottom base (1), and the four groups of double-headed screw rods (4) are all provided with corresponding nuts (6).

6. The soft-pack lithium-ion battery testing device for facilitating multi-signal monitoring according to claim 3, characterized in that: The control handle (1403), the connecting rod (1404) and the connecting block (1405) are all made of metal, and the control handle (1403) has a 180-degree adjustment function.

7. The soft-pack lithium-ion battery testing device for facilitating multi-signal monitoring according to claim 3, characterized in that: The side wall of the slider (1408) is provided with a groove matching the slide rail (1409), and the slide rail (1409) has a cross shape.

8. The soft-pack lithium-ion battery testing device for facilitating multi-signal monitoring according to claim 3, characterized in that: The slider (1408) forms a sliding structure with the slide rail (1409) through the connecting rod (1404).

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