Online testing device and system for expansion force of battery

Abstract

The utility model discloses a battery expansive force on-line testing device and system, comprising a first steel clamping plate, a second steel clamping plate and a third steel clamping plate which are arranged in parallel, four corners of the third steel clamping plate are respectively provided with a bolt in a penetrating manner, four corners between the second steel clamping plate and the third steel clamping plate are respectively provided with a shaft sleeve, and the shaft sleeve is connected with the first steel clamping plate and the second steel clamping plate. A screw part of the bolt sequentially penetrates through the shaft sleeve, the second steel clamping plate and the first steel clamping plate, and a digital signal sensor is fixedly arranged between the first steel clamping plate and the second steel clamping plate. When the battery cell is inflated and expanded, the change condition of the expansion force of the battery cell can be checked through the PC end, and the problem that continuous expansion force data is difficult to summarize, count and analyze is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery testing, in particular to an online testing device and system for battery expansion force. Background Art

[0002] In recent years, facing resource shortages, environmental pollution, and the "dual carbon" strategy advocating a green, environmentally friendly, and low-carbon lifestyle, the transformation of energy structure, adhering to the general direction of energy decarbonization, and the sustainable development of new energy have become a global consensus. In the application of new energy lithium-ion power batteries and energy storage batteries in many fields, batteries as a carrier for storing electrical energy can be used to store and transport power plants to provide electrical energy, which is of great significance to the development of the new energy industry.

[0003] Lithium-ion batteries have advantages such as high capacity, high density and long cycle life. In practical applications, they are divided into single cells, multiple cells in series and parallel, and PACK modules. The state factors and variables of the charge and discharge process of the single cell itself have a direct impact on the cells in the module. When the cells are used in different environments, they will produce mixed gases due to internal electrochemical effects. When the gas reaches a certain amount, gas pressure will be generated inside the cells. The continuous accumulation of internal gas pressure will directly cause the battery to bulge and expand on the outside, causing changes in battery size and safety. In the process of structural design of battery modules with multiple cells, the battery module structure is usually designed in combination with the expansion force of the cells to reduce the impact of the expansion force of the cells on the structure of the battery module. Therefore, it is extremely important to detect the changes in the expansion force of the battery in different environments, which is helpful for the design of cells and modules.

[0004] In the prior art, double-leaf and three-leaf steel clamping devices are mostly used to clamp the two sides of the battery cell vertically for testing, which can prevent the battery from changing in size during charging and discharging. At the same time, external sensors can be used to study the battery expansion size changes under different environmental charging and discharging conditions. However, after the battery cell swells and deforms, a pressure in the opposite direction to the battery cell expansion force is usually applied to the battery cell, so that the battery cell returns to its shape before swelling under the action of the pressure, and then the pressure is used to reversely deduce the expansion force generated by the battery cell when the swelling deformation occurs. This method of detecting the battery cell expansion force is not accurate and cannot reflect the real expansion force of the battery cell during the actual charging and discharging process. Utility Model Content

[0005] In order to solve the problems existing in the above-mentioned prior art, the utility model provides an online testing device and system for battery expansion force. By designing the hardware solution and the networking solution, when the battery cell is bloated and expanded, the change of the battery cell expansion force can be viewed through the PC, which solves the problem that continuous expansion force data is difficult to summarize and statistically analyze, so that the test results can better represent the expansion state of the battery cell, reduce errors, and thus improve the accuracy of the data.

[0006] The technical solution of the utility model is as follows:

[0007] A battery expansion force online testing device comprises a first steel splint, a second steel splint and a third steel splint arranged in parallel with each other, bolts are respectively passed through the four corners of the third steel splint, shaft sleeves are respectively arranged at the four corners between the second steel splint and the third steel splint, the screw part of the bolt passes through the shaft sleeve, the second steel splint and the first steel splint in sequence, and a digital signal sensor is fixedly arranged between the first steel splint and the second steel splint.

[0008] Furthermore, a thin film pressure sensor is arranged on the upper surface of the third steel clamping plate.

[0009] Furthermore, one end of the bolt away from the head is threadedly connected with a nut, and a gasket is arranged between the nut and the first steel clamping plate.

[0010] Furthermore, an upper groove and a lower groove adapted to the digital signal sensor are respectively formed on one side of the first steel clamping plate and the second steel clamping plate close to the digital signal sensor.

[0011] Furthermore, a plurality of heat dissipation holes are formed through the second steel clamping plate.

[0012] Furthermore, the four corners of the first steel plate, the second steel plate and the third steel plate are all rounded.

[0013] A battery expansion force online testing system comprises a digital recorder, a transmission module and a display module. The digital recorder is connected to the display module via the transmission module, and the digital recorder is respectively connected to the digital signal sensor and the thin film pressure sensor by electrical signals.

[0014] Furthermore, the digital recorder can be connected to several digital signal sensors.

[0015] Furthermore, the transmission module is RS485 bus transmission based on modbus serial protocol or LAN bus transmission based on UIP protocol.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The utility model mainly includes a hardware solution and a networking solution. When the battery cell is bloated and expanded, the change of the battery cell expansion force can be viewed through the PC, which solves the problem that continuous expansion force data is difficult to summarize and statistically analyze, so that the test results can better represent the expansion state of the battery cell, reduce errors, and thus improve the accuracy of the data. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the front view of the utility model;

[0019] Figure 2 This is a bottom view of the first steel splint of the utility model;

[0020] Figure 3 This is a top view of the second steel splint of the utility model;

[0021] Figure 4 This is a top view of the third steel splint of the utility model;

[0022] Figure 5 This is the front view of the digital signal sensor of the utility model;

[0023] Figure 6 This is a top view of the digital signal sensor of the utility model;

[0024] Figure 7 This is a schematic diagram of the structure of the digital recorder of the utility model;

[0025] Figure 8 This is a schematic diagram of the network layer LAN structure of the utility model.

[0026] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0027] 1. Bolt; 2. Nut; 3. Gasket; 4. Bushing; 5. First steel clamp; 6. Digital signal sensor; 7. Second steel clamp; 8. Third steel clamp; 9. Heat dissipation hole; 10. Lower groove; 11. Thin film pressure sensor; 12. Digital recorder; 13. Upper groove; 14. Digital signal sensor access port. DETAILED DESCRIPTION

[0028] In order to make the contents of the present invention easier to understand, the technical solution of the present invention is further described below in conjunction with specific implementation methods and drawings, but the present invention is not limited thereto.

[0029] Embodiment 1

[0030] See also Figure 1 and Figure 3The utility model provides a technical solution: an online battery expansion force testing device, comprising a first steel splint 5, a second steel splint 7 and a third steel splint 8 arranged in parallel with each other, bolts 1 are respectively passed through the four corners of the third steel splint 8, and shaft sleeves 4 are respectively arranged at the four corners between the second steel splint 7 and the third steel splint 8, the screw part of the bolt 1 passes through the shaft sleeve 4, the second steel splint 7 and the first steel splint 5 in sequence, and a digital signal sensor 6 is fixedly arranged between the first steel splint 5 and the second steel splint 7.

[0031] As a further preference of this embodiment, a thin film pressure sensor 11 is arranged on the upper surface of the third steel splint 8. The thin film pressure sensor 11 has high sensitivity and a wide detection range, and can monitor the expansion and contraction of the battery cell during the charging and discharging process. By monitoring the expansion force at different positions, the internal reaction of the battery can be better understood, and the design and manufacturing process can be optimized. The change in expansion force after the battery is compressed is converted into an electrical signal by the thin film pressure sensor 11, and is fully transmitted to the digital signal sensor 6 from the four positioning columns at the four corners. The digital signal sensor 6 receives the change in expansion force after the battery expands from the sleeve 4, thereby being able to accurately detect the expansion force.

[0032] Combination Figure 2 and Figure 4 The end of the bolt 1 away from the head is threadedly connected with a nut 2, and a gasket 3 is arranged between the nut 2 and the first steel clamping plate 5.

[0033] As a further preference of this embodiment, the first steel clamping plate 5 and the second steel clamping plate 7 are respectively provided with an upper groove 13 and a lower groove 10 adapted to the digital signal sensor 6 on one side close to the digital signal sensor 6 for fixing and placing the digital signal sensor 6.

[0034] As a further preferred embodiment of the present invention, a plurality of heat dissipation holes 9 are formed through the second steel clamping plate 7 to ensure that the heat of the battery cell can be effectively dissipated during the test, thereby ensuring the accuracy of the test data.

[0035] As a further preference of this embodiment, the four corners of the first steel clamping plate 5, the second steel clamping plate 7 and the third steel clamping plate 8 are all rounded to ensure the safety of people touching the clamping plates under the action of gravity.

[0036] Embodiment 2

[0037] A battery expansion force online testing system includes a digital recorder 12, a transmission module and a display module. The digital recorder 12 is connected to the display module through the transmission module. The digital recorder 12 is electrically connected to a digital signal sensor 6 and a thin film pressure sensor 11 respectively. Preferably, the display module is a PC terminal.

[0038] As a further preference of this embodiment, the digital recorder 12 can be connected to a number of digital signal sensors 6 and multiple module tests to achieve multi-channel simultaneous testing of multiple groups of batteries.

[0039] As a further preference of this embodiment, the transmission module is RS485 bus transmission based on the modbus serial protocol or LAN bus transmission based on the UIP protocol.

[0040] Embodiment 3

[0041] When it is necessary to test the expansion force of the battery, the battery is placed in the middle of the third steel clamp 8 and the side provided with the film pressure sensor 11 is placed close to the third steel clamp 8. When the second steel clamp 7 is pressed down to clamp the test battery, the test battery expands and squeezes the film pressure sensor 11. The film pressure sensor 11 can accurately receive the changes in the battery expansion pressure, and fully transmit the battery expansion conditions to the digital signal sensor 6 from the four bushings 4 at the four corners, so as to accurately detect the expansion force.

[0042] From the above description, it can be seen that the utility model mainly includes a hardware solution and a networking solution. The hardware solution includes: a three-leaf steel splint, four shaft sleeves 4, a digital signal sensor, and a thin film pressure sensor. The networking solution includes: a fixture end-sensor-network data transmission-digital recorder-PC end. The present application can access multiple digital signal sensors and multiple module tests to realize multi-channel simultaneous testing of multiple groups of battery test solutions, and then pass through the network layer LAN to the PC end. When the battery cell is bloated and expanded, the change in the expansion force of the battery cell can be viewed through the PC end, which solves the problem that the continuous expansion force data is difficult to summarize and statistically analyze, so that the test results can better represent the expansion state of the battery cell, reduce errors, and thus improve the accuracy of the data.

[0043] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery expansion force online testing device, characterized in that: The invention comprises a first steel clamp (5), a second steel clamp (7) and a third steel clamp (8) which are arranged in parallel with each other, wherein bolts (1) are respectively passed through the four corners of the third steel clamp (8), and shaft sleeves (4) are respectively arranged at the four corners between the second steel clamp (7) and the third steel clamp (8), and the screw rod part of the bolt (1) is passed through the shaft sleeve (4), the second steel clamp (7) and the first steel clamp (5) in sequence, and a digital signal sensor (6) is fixedly arranged between the first steel clamp (5) and the second steel clamp (7).

2. The battery expansion force online testing device according to claim 1, characterized in that: A thin film pressure sensor (11) is provided on the upper surface of the third steel clamping plate (8).

3. The battery expansion force online testing device according to claim 2, characterized in that: The end of the bolt (1) away from the head is threadedly connected to a nut (2), and a gasket (3) is arranged between the nut (2) and the first steel clamping plate (5).

4. The battery expansion force online testing device according to claim 3, characterized in that: An upper groove (13) and a lower groove (10) respectively adapted to the digital signal sensor (6) are formed on one side of the first steel clamping plate (5) and the second steel clamping plate (7) close to the digital signal sensor (6).

5. The battery expansion force online testing device according to claim 4, characterized in that: The second steel clamping plate (7) is provided with a plurality of heat dissipation holes (9) extending therethrough.

6. The battery expansion force online testing device according to claim 4, characterized in that: The four corners of the first steel clamping plate (5), the second steel clamping plate (7) and the third steel clamping plate (8) are all rounded.

7. A battery expansion force online testing system, comprising a battery expansion force online testing device according to any one of claims 1 to 6, characterized in that: It comprises a digital recorder (12), a transmission module and a display module. The digital recorder (12) is connected to the display module via the transmission module. The digital recorder (12) is respectively connected to the digital signal sensor (6) and the thin film pressure sensor (11) via electrical signals.

8. The battery expansion force online testing system according to claim 7, characterized in that: The digital recorder (12) can be connected to a plurality of digital signal sensors (6).

9. The battery expansion force online testing system according to claim 7, characterized in that: The transmission module is RS485 bus transmission based on modbus serial protocol or LAN bus transmission based on UIP protocol.

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