Battery module pressure testing device and testing method

Abstract

The invention discloses a battery module pressure testing device and method, the pressure testing device is provided with a testing tool, a pressure bearing part and a pressure testing module, the testing tool is provided with two oppositely arranged limiting parts, when the voltage testing of a battery module is carried out, the battery module to be tested is placed in a battery accommodating space, and the pressure testing module is arranged in the battery accommodating space; the pressure-bearing component is arranged on the adjacent single batteries of the battery module, in the working process of the battery module, each single battery expands and extrudes the pressure-bearing component, and the pressure measuring module measures the pressure borne by the pressure-bearing component, so that the working pressure between the two adjacent attached single batteries can be accurately obtained. When the battery module works, the pressure bearing component is taken down and arranged between the rest adjacent single batteries, the pressure of the rest adjacent and attached two single batteries is measured when the battery module works, the real pressed state of each single battery when the battery module works is effectively reflected, and the pressure environment of each single battery when the battery module works can be accurately evaluated.

Description

Technical Field

[0001] The present invention relates to the technical field of battery testing, and in particular to a battery module pressure testing device and a testing method. Background Art

[0002] The breathing effect of soft-pack batteries will cause the volume of the battery to change during the charging and discharging process. The expansion and contraction caused by the breathing effect of soft-pack batteries will have a great impact on the life of the battery, so it is very important to study the relationship between the pressure and life of soft-pack batteries throughout their life cycle.

[0003] In order to increase the voltage and current of the battery module, multiple soft-pack batteries are usually stacked together in series or parallel to form a battery module. The expansion and stress of the battery module change at any time after power is turned on. In order to understand the pressure changes of each soft-pack battery during the operation of the battery module, the battery expansion force test device with publication number CN117870932A is generally used to detect the battery pressure state of each single battery during operation.

[0004] Although the working performance of the battery module can be guaranteed to a certain extent by pressure testing each single cell, in actual work, since the operation of each single cell is easily affected by the squeezing of adjacent single cells, it is difficult to reflect the actual pressure state of each single cell in actual work through individual testing of the single cell, and it is therefore difficult to accurately evaluate the pressure environment of each single cell during operation. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and to propose a battery module pressure testing device and a testing method to solve the technical problem that the battery module pressure testing device in the prior art is difficult to reflect the actual pressure state of each single battery in actual operation, making it difficult to accurately evaluate the working state of each single battery.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a battery module pressure testing device, wherein the battery module comprises a plurality of single cells stacked in sequence, including: The test fixture is provided with two relatively arranged limit members, a battery accommodation space is formed between the two limit members, and the battery accommodation space is used to accommodate the battery module; A pressure-bearing component, used to be arranged between any two adjacent single cells of the battery module and used to withstand the compression of the two adjacent single cells; and The pressure measuring module is connected to the pressure bearing component and is used to measure the pressure borne by the pressure bearing component.

[0007] In some embodiments, the pressure-bearing component includes a first pressure-bearing component and a second pressure-bearing component. The second pressure-bearing component is slidably connected to the first pressure-bearing component and forms a hydraulic chamber with the second pressure-bearing component. The hydraulic chamber is used to fill liquid. The pressure measuring module is connected to the hydraulic chamber for measuring the hydraulic pressure of the hydraulic chamber.

[0008] In some embodiments, the first pressure-bearing member is provided with a main groove and an adjusting groove, the adjusting groove is connected to the main groove, and the second pressure-bearing member is provided with a sliding portion, the sliding portion is slidably connected to the adjusting groove, and is enclosed with the adjusting groove and the main groove to form the hydraulic chamber.

[0009] In some embodiments, the adjustment groove includes a plurality of evenly spaced sub-grooves, each of which is connected to the main groove, and the sliding portion includes a plurality of sliding columns, each of which is slidably connected to each of the sub-grooves.

[0010] In some embodiments, the pressure testing device further includes a pressure regulating unit, which is communicated with the hydraulic chamber and is used to regulate the hydraulic pressure of the hydraulic chamber by supplying fluid to the hydraulic chamber.

[0011] In some embodiments, the pressure regulating unit includes a piston assembly and a fluid supply pipe, one end of the fluid supply pipe is connected to the piston assembly, and the other end of the fluid supply pipe is connected to the hydraulic chamber, for controlling the hydraulic pressure of the hydraulic chamber through the fluid supply of the piston assembly.

[0012] In some embodiments, the pressure measuring module includes a liquid outlet pipe, a liquid filling box, a pressure gauge and an exhaust valve, the two ends of the liquid outlet pipe are respectively connected to the hydraulic chamber and the liquid filling box, and the pressure gauge and the exhaust valve are installed in the liquid filling box.

[0013] In some embodiments, the test tool further includes an adjustment belt, which is sleeved on the two limit members and locks the limit members, so as to adjust the locking force acting on the limit members by adjusting the length.

[0014] In some embodiments, the test fixture further includes a sliding rod, which is connected to the limiting member and extends toward the stacking direction of the single cells, and is used for each of the single cells to be slidably mounted.

[0015] In a second aspect, the present invention further provides a battery module pressure testing method, which is performed by the battery module pressure testing device, and comprises the following steps: Place the battery module to be tested in the battery accommodation space; The pressure-bearing component is installed between adjacent cells of the battery module; Make the battery module powered on and work; The pressure measuring module measures the pressure borne by the pressure-bearing component.

[0016] Compared with the prior art, the battery module pressure testing device provided by the present invention is provided with a test fixture, a pressure-bearing component and a pressure measuring module. The test fixture is provided with two relatively arranged limit members, and a battery accommodating space is formed between the two limit members. When performing a voltage test on the battery module, the battery module to be tested is placed in the battery accommodating space, and the pressure-bearing component is installed on the adjacent single battery of the battery module. Then the battery module is powered on to work. During the operation of the battery module, each single battery expands, causing compression on the pressure-bearing component. The pressure measuring module is connected to the pressure component, and the pressure borne by the pressure component can be measured. By measuring, the working pressure between the two adjacent laminated cells can be accurately obtained, and then the pressure-bearing component is removed and installed between the remaining adjacent cells, and the pressure of the two adjacent and laminated cells when the battery module is working is measured. Finally, all cells are measured by the pressure between the adjacent laminated cells. Therefore, the influence of the squeezing of the adjacent cells can be considered synchronously, and the real pressure state of each cell when the battery module is working can be effectively reflected, so as to accurately evaluate the working pressure environment of each cell of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural schematic diagram of a battery module pressure testing device provided by an embodiment of the present invention; Figure 2 is a schematic structural diagram of a pressure-bearing component provided by an embodiment of the present invention; Figure 3 is a side view of a pressure-bearing component provided by an embodiment of the present invention; Figure 4 is along Figure 3 Sectional view along line AA Figure 5 This is the process of the battery module pressure testing method provided by an embodiment of the present invention.

[0018] Reference numerals in the figures: 10—Test fixture 11—Limiting part 12—Sliding rod 13 - Adjustment belt 20 - Pressure bearing component 21 - First pressure bearing component 22—Second pressure bearing member 23—Hydraulic chamber 30—Pressure measuring module 31 - liquid outlet pipe 32 - liquid filling box 33 - pressure gauge 34 - exhaust valve 40 - pressure regulating unit 41 - piston assembly 42—liquid supply pipe 211—main tank 212—adjustment tank 221 - sliding part 2121 - sub-groove 2211 - sliding column 10a—battery module 11a—single battery. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] In order to solve the technical problem that the battery module pressure testing device in the prior art is difficult to reflect the real pressure state of each single battery in actual operation, so that it is difficult to accurately evaluate the working state of each single battery, an embodiment of the present invention provides a battery module pressure testing device, the battery module includes a plurality of soft-pack single batteries stacked in sequence, and the pressure testing device obtains the real pressure state of all soft-pack single batteries when the battery module is working, so as to accurately evaluate the pressure environment of each single battery of the battery module when working, thereby realizing accurate evaluation of the working performance of the battery module.

[0021] The battery module pressure testing device provided by the embodiment of the present invention is as follows: Figure 1 As shown, it includes a test fixture 10, a pressure-bearing component 20 and a pressure measuring module 30. The test fixture 10 is provided with two relatively arranged limit members 11, and a battery accommodating space is formed between the two limit members 11, and the battery accommodating space is used to accommodate the battery module 10a; the pressure-bearing component 20 is used to be arranged between any two adjacent single batteries 11a of the battery module 10a, and is used to withstand the extrusion of two adjacent single batteries 11a; the pressure measuring module 30 is connected to the pressure-bearing component 20, and is used to measure the pressure borne by the pressure-bearing component 20.

[0022] Specifically, the battery module pressure testing device is provided with a test fixture 10, a pressure-bearing component 20 and a pressure measuring module 30. The test fixture 10 is provided with two relatively arranged limit members 11, and a battery accommodating space is formed between the two limit members 11. When performing a voltage test on the battery module 10a, the battery module 10a to be tested is placed in the battery accommodating space, and the pressure-bearing component 20 is installed on the adjacent single battery 11a of the battery module 10a. Then, the battery module 10a is powered on to work. During the operation of the battery module 10a, each single battery 11a expands, causing compression on the pressure-bearing component 20. The pressure measuring module 30 is connected to the pressure component to measure the pressure borne by the pressure-bearing component 20. The pressure between the two adjacent laminated cells 11a during operation can be accurately obtained, and then the pressure-bearing component 20 is removed and installed between the remaining adjacent cells 11a, and the pressure of the two adjacent and laminated cells 11a during operation of the battery module 10a is measured. Finally, all cells 11a are measured by the pressure between the adjacent laminated cells 11a. Therefore, the influence caused by the squeezing of the adjacent cells 11a can be considered synchronously, and the real pressure state of each cell 11a when the battery module 10a is working can be effectively reflected, so as to accurately evaluate the pressure environment of each cell 11a of the battery module 10a during operation.

[0023] In this embodiment, by measuring the pressure between adjacent single cells 11a of the battery module 10a in the working state through the battery module pressure testing device, the tightness between the single cells 11a can be conveniently adjusted adaptively, so that the pressure on each soft-pack single cell 11a of the battery module 10a in the working state tends to be balanced.

[0024] In this embodiment, the pressure measured by the pressure measuring module 30 is the force of mutual compression between two adjacent single cells 11 a.

[0025] It can be understood that the limit member 11 can be any structure such as a limit plate, a limit frame or a limit rod that can provide limit for the battery module 10a on both sides of the battery module 10a, and the test fixture 10 is any fixture structure that can realize the fixation of the limit member 11.

[0026] In this embodiment, the limiting member 11 is a plate-shaped structure.

[0027] In one embodiment, Figure 1As shown, the test fixture 10 also includes a sliding rod 12, which is connected to the limiting member 11 and extends in the stacking direction of the single cell 11a, and is used for sliding sleeves of each single cell 11a. Specifically, each soft-pack single cell 11a can be sleeved on the sliding rod 12 to achieve the flat stacking of each single cell 11a between the two limiting members 11, and limit the horizontal reverse direction of each single cell 11a. The sliding rod 12 is used to slide the single cell 11a, so that when the pressure between adjacent single cells 11a is measured, it is only necessary to take out the pressure-bearing component 20, and then control the single cell 11a to slide along the sliding rod 12, so that another adjacent single cell 11a is spaced, and then the pressure-bearing component 20 is placed in the space between the adjacent single cells 11a, and the pressure-bearing component 20 can be installed between the other two adjacent single cells 11a.

[0028] In this embodiment, the sliding rod 12 is fixedly connected to one of the limiting members 11 .

[0029] In one embodiment, Figure 1 As shown, the test fixture 10 also includes an adjustment belt 13, which is sleeved on the two limit members 11 and locks the limit members 11, so as to adjust the locking force acting on the limit members 11 by adjusting the length. Specifically, the adjustment belt 13 can lock the two limit members 11 by being sleeved on the two limit members 11, and then the distance between the two limit members 11 can be adjusted according to the height of the battery module 10a, so that the test fixture 10 can limit the battery module 10a of any size. At the same time, the pressure of the limit members 11 acting on both sides of the battery module 10a can be adjusted by the adjustment belt 13, so that the pressure on both sides of the battery module 10a is closer to the pressure of the battery module 10a when it is actually working.

[0030] It can be understood that the adjustment belt 13 can be an elastic or non-elastic rope. When the adjustment belt 13 is an elastic rope, the limit member 11 can be adaptively adjusted by its own elastic force; when the adjustment belt 13 is a non-elastic rope, the distance between the two limit members 11 can be adjusted by adjusting the length.

[0031] In this embodiment, Figure 1 As shown, the adjusting belt 13 is provided with an adjusting piece, and the adjusting belt 13 can adjust the length of the portion enclosing the two limiting pieces 11 through the adjusting piece.

[0032] In this embodiment, Figure 1 As shown, the limiting member 11 is provided with a limiting groove, and the adjusting belt 13 is bound to the limiting groove to prevent the adjusting belt 13 from deflecting.

[0033] In this embodiment, after the adjustment of the adjustment belt 13 is completed, the length of the adjustment belt 13 should remain unchanged during the entire test process so that the pressure on both sides of the battery module 10a is always stable.

[0034] It can be understood that the pressure-bearing component 20 can be a spring, which is arranged between two adjacent single cells 11a, and the pressure measuring module 30 measures the pressure between the two adjacent single cells 11a by measuring the change in the elastic force of the spring. The pressure-bearing component 20 can also be a pressure-bearing block, and the pressure measuring module 30 is a pressure sensor arranged on the pressure-bearing block, which measures the pressure between the two adjacent single cells 11a by sensing the pressure borne by the pressure-bearing block.

[0035] In one embodiment, Figure 1-4 As shown, the pressure-bearing component 20 includes a first pressure-bearing component 21 and a second pressure-bearing component 22. The second pressure-bearing component 22 is slidably connected to the first pressure-bearing component 21, and a hydraulic chamber 23 is formed between the second pressure-bearing component 22 and the second pressure-bearing component 22. The hydraulic chamber 23 is used to fill liquid. The pressure measuring module 30 is connected to the hydraulic chamber 23 to measure the hydraulic pressure of the hydraulic chamber 23. Specifically, the pressure-bearing component 20 is provided with the first pressure-bearing component 21 and the second pressure-bearing component 22 which are slidably connected. When the single cell 11a expands, pressure acting on the first pressure-bearing component 21 and the second pressure-bearing component 22 will be formed, so that the hydraulic pressure in the hydraulic chamber 23 changes. The pressure measuring module 30 can measure the pressure state of two adjacent single cells 11a by measuring the change in the hydraulic pressure in the hydraulic chamber 23. It can be understood that the first pressure-bearing member 21 and the second pressure-bearing member 22 can be any structure that can be enclosed to form a closed cavity that can be filled with liquid.

[0036] In one embodiment, Figure 4 As shown, the first pressure-bearing member 21 is provided with a main groove 211 and an adjusting groove 212, and the adjusting groove 212 is connected to the main groove 211, and the second pressure-bearing member 22 is provided with a sliding portion 221, and the sliding portion 221 is slidably connected to the adjusting groove 212, and is enclosed with the adjusting groove 212 and the main groove 211 to form the hydraulic cavity 23. Specifically, the second pressure-bearing member 22 is slidably connected to the adjusting groove 212 through the sliding portion 221, and while realizing the sliding connection with the first pressure-bearing member 21, the hydraulic cavity 23 structure can also be formed by the enclosure of the sliding portion 221, the adjusting groove 212 and the main groove 211, and the main groove 211 part forms the main cavity structure, and the adjusting groove 212 part forms the adjusting cavity structure. Since the sizes and stress conditions of each single battery 11a are different, the adjustment cavity can be used to control the size of the adjustment cavity by controlling the amount of liquid in the adjustment cavity before performing a pressure test between the single batteries 11a, so that before the pressure test, the pressure between the adjacent single batteries 11a on the pressure-bearing component 20 is equal, so as to more accurately reflect the pressure conditions of each single battery 11a during operation.

[0037] In this embodiment, usually, when the battery module 10a is not working, there will be no interaction between the single cells 11a. Due to the force transmission effect, the single cells 11a of the battery module 10a are subjected to the same pressure when not working. In this embodiment, the pressure on the pressure-bearing component 20 before the test can be kept the same by adjusting the adjustment cavity, which is closer to the actual stress state of the battery module 10a.

[0038] In this embodiment, the pressure of the pressure-bearing component 20 before the test should be kept the same as the pressure of the pressure-bearing component 20 before the first test.

[0039] It can be understood that the sliding portion 221 can be any sliding structure that can slide along the adjusting groove 212 , and the adjusting groove 212 is a groove structure that is compatible with the structure of the sliding portion 221 .

[0040] In one embodiment, Figure 4 As shown, the adjustment groove 212 includes a plurality of evenly spaced sub-grooves 2121, each of which is connected to the main groove 211, and the sliding portion 221 includes a plurality of sliding posts 2211, each of which is slidably connected to each of the sub-grooves 2121. Specifically, by sliding the sliding posts 2211 and each of the sub-grooves 2121, when any part of the first pressure-bearing member 21 and the second pressure-bearing member 22 is squeezed, the pressure in the main cavity can be changed immediately, thereby making the pressure change in the main cavity more sensitive and improving the sensitivity of the test.

[0041] In one embodiment, Figure 1 As shown, the pressure measuring module 30 includes a liquid outlet pipe 31, a liquid filling box 32, a pressure gauge 33 and an exhaust valve 34. The two ends of the liquid outlet pipe 31 are connected to the hydraulic chamber 23 and the liquid filling box 32 respectively. The pressure gauge 33 and the exhaust valve 34 are installed in the liquid filling box 32. Specifically, when the first pressure-bearing member 21 and the second pressure-bearing member 22 are pressurized, the hydraulic pressure inside the liquid filling box 32 will change. The pressure gauge 33 measures the hydraulic pressure inside the hydraulic chamber 23 by measuring the hydraulic pressure inside the liquid filling box 32, and then tests the actual pressure condition of the single cell 11a. The exhaust valve 34 can exhaust the liquid filling box 32 to prevent the gas inside the liquid filling box 32 from affecting the hydraulic pressure inside the box body, thereby improving the accuracy of the hydraulic pressure measurement.

[0042] In this embodiment, the liquid outlet pipe 31 is connected to the main cavity of the hydraulic cavity 23 .

[0043] In one embodiment, Figure 1As shown, the pressure testing device further includes a pressure regulating unit 40, which is in communication with the hydraulic chamber 23 and is used to adjust the hydraulic pressure of the hydraulic chamber 23 by supplying liquid to the hydraulic chamber 23. Specifically, the pressure regulating unit 40 can adjust the hydraulic pressure of the hydraulic chamber 23 by supplying or extracting liquid to the hydraulic chamber 23, so that the pressure borne by the pressure-bearing component 20 can be adjusted to be consistent before the pressure test of the single cell 11a is performed through the pressure regulating function of the pressure regulating unit 40.

[0044] In this embodiment, the pressure regulating unit 40 is connected to the main chamber of the hydraulic chamber 23 .

[0045] In one embodiment, Figure 1 As shown, the pressure regulating unit 40 includes a piston assembly 41 and a liquid supply pipe 42, one end of the liquid supply pipe 42 is connected to the piston assembly 41, and the other end of the liquid supply pipe 42 is connected to the hydraulic chamber 23, and is used to control the hydraulic pressure of the hydraulic chamber 23 through the liquid supply of the piston assembly 41. Specifically, by manipulating the piston assembly 41, the liquid can be extracted from or supplied into the hydraulic chamber 23, thereby realizing the control of the hydraulic pressure in the hydraulic chamber 23.

[0046] In a second aspect, the present invention also provides a battery module pressure testing method, which is performed by the battery module pressure testing device, such as Figure 5 As shown, the following steps are included: Placing the battery module 10a to be tested in the battery accommodation space; The pressure-bearing member 20 is installed between each adjacent battery cell 11a of the battery module 10a; Powering up the battery module 10a; The pressure measuring module 30 measures the pressure on the pressure bearing component 20 .

[0047] Specifically, through the above test method, the impact caused by the squeezing of adjacent single cells 11a can be considered simultaneously, effectively reflecting the actual pressure state of each single cell 11a when the battery module 10a is working, and then the pressure environment of each single cell 11a of the battery module 10a during operation can be accurately evaluated.

[0048] In this embodiment, each time after the battery module 10a to be tested is placed in the battery accommodation space and before the battery module 10a is powered on, the amount of liquid in the hydraulic chamber 23 is adjusted by controlling the piston so that the reading of the pressure gauge 33 remains the same before the battery module 10a is powered on. The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery module pressure test device, wherein the battery module comprises a plurality of single cells stacked in sequence, characterized in that: include: The test fixture is provided with two relatively arranged limit members, a battery accommodation space is formed between the two limit members, and the battery accommodation space is used to accommodate the battery module; A pressure-bearing component, used to be arranged between any two adjacent single cells of the battery module and used to withstand the compression of the two adjacent single cells; and The pressure measuring module is connected to the pressure bearing component and is used to measure the pressure borne by the pressure bearing component.

2. The battery module pressure testing device according to claim 1, characterized in that: The pressure-bearing component includes a first pressure-bearing component and a second pressure-bearing component. The second pressure-bearing component is slidably connected to the first pressure-bearing component and forms a hydraulic cavity with the second pressure-bearing component. The hydraulic cavity is used to fill liquid. The pressure measuring module is connected to the hydraulic cavity and is used to measure the hydraulic pressure of the hydraulic cavity.

3. The battery module pressure testing device according to claim 2, characterized in that: The first pressure-bearing member is provided with a main groove and an adjusting groove, wherein the adjusting groove is connected to the main groove, and the second pressure-bearing member is provided with a sliding portion, wherein the sliding portion is slidably connected to the adjusting groove and encloses the adjusting groove and the main groove to form the hydraulic chamber.

4. The battery module pressure testing device according to claim 3, characterized in that: The adjusting groove comprises a plurality of evenly spaced sub-grooves, each of which is communicated with the main groove, and the sliding portion comprises a plurality of sliding posts, each of which is slidably connected to each of the sub-grooves.

5. The battery module pressure testing device according to claim 2, characterized in that: The pressure testing device further includes a pressure regulating unit, which is communicated with the hydraulic chamber and is used to regulate the hydraulic pressure of the hydraulic chamber by supplying fluid to the hydraulic chamber.

6. The battery module pressure testing device according to claim 5, characterized in that: The pressure regulating unit includes a piston assembly and a liquid supply pipe, one end of the liquid supply pipe is connected to the piston assembly, and the other end of the liquid supply pipe is connected to the hydraulic chamber, and is used to control the hydraulic pressure of the hydraulic chamber through the liquid supply of the piston assembly.

7. The battery module pressure testing device according to claim 2, characterized in that: The pressure measuring module comprises a liquid outlet pipe, a liquid filling box, a pressure gauge and an exhaust valve. Both ends of the liquid outlet pipe are respectively connected to the hydraulic chamber and the liquid filling box. The pressure gauge and the exhaust valve are installed in the liquid filling box.

8. The battery module pressure testing device according to any one of claims 1 to 7, characterized in that: The testing tool also includes an adjusting belt, which is sleeved on the two limiting members and locks the limiting members, so as to adjust the locking force acting on the limiting members by adjusting the length.

9. The battery module pressure testing device according to any one of claims 1 to 7, characterized in that: The testing fixture further includes a sliding rod, which is connected to the limiting member and extends toward the stacking direction of the single cells, and is used for each of the single cells to be slidably mounted.

10. A battery module pressure testing method, characterized in that: The method is performed by the battery module pressure testing device according to any one of claims 1 to 9, comprising the following steps: Place the battery module to be tested in the battery accommodation space; The pressure-bearing component is installed between adjacent cells of the battery module; Make the battery module powered on and work; The pressure measuring module measures the pressure borne by the pressure-bearing component.

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