Battery electrolyte monitoring device and battery testing device
By connecting the transparent detection tube with the storage cavity of the battery case, intuitive monitoring of the electrolyte height and consumption is achieved, and the problem of difficulty in monitoring the consumption of the electrolyte in the battery in the prior art is solved, ensuring the safe and stable operation of the battery.
Patent Information
- Application Number
- CN202421521143.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-06-28
AI Technical Summary
The prior art is difficult to effectively monitor the consumption of electrolyte inside the battery, resulting in an increase in internal resistance of the battery, a decrease in circulation stability during the long-term cycle, and a safety hazard.
A battery electrolyte monitoring device is provided, which connects the two ends of the detection tube made of transparent material with the housing interior to form a communication system, and the liquid automatically adjusts the height to maintain a pressure balance, thereby intuitively displaying the electrolyte height or consumption.
It realizes intuitive monitoring of the height and consumption of the electrolyte inside the battery, promptly discovers safety issues in battery use, and ensures the safe operation of the battery.
Smart Images
Figure CN222837636U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of battery monitoring, and in particular to a battery electrolyte monitoring device and a battery testing device. Background Art
[0002] Electrolyte is a necessary component of the battery, and the amount of electrolyte injected into the battery is directly related to the performance of the battery. When the amount of electrolyte injected into the battery is too high, it will not only increase the cost of battery preparation, but the excess electrolyte will also decompose and generate gas during the charging and discharging process, resulting in poor contact between the positive and negative electrodes of the battery, deterioration of the cycle performance, and a series of safety problems; when the electrolyte is consumed too much and the remaining injection volume is too low, the conduction of lithium ions between the positive and negative electrodes is limited, which will cause the battery's internal resistance to increase during long-term cycles and reduce cycle stability. Moreover, excessive consumption of electrolyte may cause the internal temperature of the battery to rise, increasing the risk of thermal runaway or explosion of the battery. By regularly detecting the consumption of electrolyte, potential safety hazards can be discovered and dealt with in a timely manner to ensure the safe operation of the battery.
[0003] Therefore, it is necessary to provide a device capable of monitoring the consumption of battery electrolyte. Summary of the invention
[0004] The present disclosure provides a battery electrolyte monitoring device and a battery testing device to improve the problem in the prior art that it is difficult to monitor the electrolyte inside the battery.
[0005] In a first aspect, the present disclosure provides a battery electrolyte monitoring device, comprising: a shell and a detection tube, the detection tube is made of a transparent material, a housing cavity is provided in the shell, a first connecting port is provided at a position close to the first end of the shell, a second connecting port is provided at a position close to the second end of the shell, the first connecting port and the second connecting port are respectively connected to the housing cavity, a first pipe opening is provided at the first end of the detection tube, the first pipe opening is connected to the first connecting port, and a second pipe opening is provided at the second end of the detection tube, the second pipe opening is connected to the second connecting port.
[0006] In some embodiments, a first scale is provided on the detection tube.
[0007] In some embodiments, the first end of the detection tube is connected to the side wall of the first communication port by adhesive sealing.
[0008] In some embodiments, the second end of the detection tube is connected to the side wall of the second communication port by adhesive sealing.
[0009] In some embodiments, a U-shaped tube is also included, wherein the material of the U-shaped tube is a transparent material, a third connecting port is opened at one end of the shell away from the first connecting port, the third connecting port is connected to the accommodating cavity, the first port of the U-shaped tube is connected to the third connecting port, the second port of the U-shaped tube is used to communicate with the outside, and the arc-shaped tube section of the U-shaped tube is facing the direction where the first connecting port is located, and liquid is arranged in the U-shaped tube, and the volume of the liquid is smaller than the internal volume of the U-shaped tube.
[0010] In some embodiments, a second scale is provided on the U-shaped tube.
[0011] In some embodiments, the first port of the U-shaped tube is connected to the side wall of the third connecting port by adhesive sealing.
[0012] In some embodiments, it also includes a connecting member, a first clamping plate and a second clamping plate, the shell has a first clamping surface, a second clamping surface and a connecting surface, the first connecting port and the second connecting port are both opened on the connecting surface, the first clamping surface and the second clamping surface are respectively adjacent to the connecting surface, the first clamping surface and the second clamping surface are arranged opposite to each other, the first clamping plate abuts against the first clamping surface, the second clamping plate abuts against the second clamping surface, and the first clamping plate and the second clamping plate are connected by the connecting member.
[0013] In some embodiments, the first clamping plate is provided with a first connecting hole, and the second clamping plate is provided with a second connecting hole, the first connecting hole and the second connecting hole are opened opposite to each other, the connecting member includes a screw and a nut, the length of the screw is greater than the distance between the first clamping plate and the second clamping plate when the first clamping plate and the second clamping plate abut against the shell, the screw passes through the first connecting hole and the second connecting hole in sequence and is threadedly connected to the nut, the end of the screw away from the nut abuts against the side of the first clamping plate facing away from the shell, and the nut abuts against the side of the second clamping plate facing away from the shell.
[0014] In a second aspect, the present disclosure provides a battery testing device, comprising: any of the above-mentioned battery electrolyte monitoring devices.
[0015] The present disclosure provides a battery electrolyte monitoring device and a battery testing device, which form a connected system by connecting the two ends of a detection tube with the internal accommodating cavity of a shell. In this connected system, when the liquid is in a static state, its internal pressure is equal, so the liquid will automatically adjust its height to maintain pressure balance. Therefore, the liquid height inside the shell will be directly displayed in the transparent detection tube, thereby realizing intuitive viewing of the electrolyte height or electrolyte consumption inside the shell, which helps to promptly discover safety problems in battery use. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The present disclosure will be described in more detail below based on embodiments and with reference to the accompanying drawings:
[0017] Figure 1 A structural intention of a battery electrolyte monitoring device provided by an embodiment of the present disclosure;
[0018] Figure 2 A schematic diagram of a U-shaped tube structure of a battery electrolyte monitoring device provided in an embodiment of the present disclosure;
[0019] Figure 3 A schematic diagram of the matching relationship between a first clamping plate and a second clamping plate and a housing of a battery electrolyte monitoring device provided in an embodiment of the present disclosure;
[0020] Figure 4 A schematic diagram of the initial state of an internal electrolyte of a battery testing device provided by an embodiment of the present disclosure;
[0021] Figure 5 A schematic diagram of monitoring electrolyte and gas production of a battery testing device provided in an embodiment of the present disclosure after multiple charge and discharge cycles.
[0022] Explanation of the reference numerals: 100, shell; 110, first connecting port; 120, second connecting port; 130, third connecting port; 140, connecting surface; 200, detection tube; 210, first scale; 300, U-shaped tube; 310, second scale; 400, liquid; 500, connecting piece; 510, screw; 520, nut; 600, first clamping plate; 700, second clamping plate.
[0023] In the drawings, the same reference numerals are used for the same components and the drawings are not drawn to scale. DETAILED DESCRIPTION
[0024] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, and to fully understand and implement how the present disclosure applies technical means to solve technical problems and achieve the corresponding technical effects, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only embodiments of a part of the present disclosure, not all of the embodiments. The embodiments of the present disclosure and the various features in the embodiments can be combined with each other without conflict, and the technical solutions formed are all within the scope of protection of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present disclosure.
[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.
[0026] In this embodiment, if Figure 1 As shown, a battery electrolyte monitoring device provided by an embodiment of the present disclosure includes: a shell 100 and a detection tube 200, the detection tube 200 is made of a transparent material, a containing cavity is arranged in the shell 100, a first connecting port 110 is provided at a position close to the first end of the shell 100, and a second connecting port 120 is provided at a position close to the second end of the shell 100, the first connecting port 110 and the second connecting port 120 are respectively connected to the containing cavity, a first pipe opening is provided at the first end of the detection tube 200, and the first pipe opening is connected to the first connecting port 110, and a second pipe opening is provided at the second end of the detection tube 200, and the second pipe opening is connected to the second connecting port 120.
[0027] In this embodiment, the housing 100 may be a shell of a battery cell, such as an aluminum housing. A housing cavity is provided inside the housing 100, and the electrolyte is injected into the housing cavity. The first end of the housing 100 may be a bottom end of the housing, and the second end of the housing 100 may be a top end of the housing. The first communication port 110 is provided at a position of the housing 100 close to the top end of the housing, and the second communication port 120 is provided at a position of the housing 100 close to the bottom end of the housing.
[0028] In some embodiments, the detection tube includes a display segment and a connecting segment, the connecting segment includes a first sub-segment and a second sub-segment, the first sub-segment is connected to the first end of the display segment, the first sub-segment has a first tube opening, the second sub-segment is connected to the second end of the display segment, and the second sub-segment has a second tube opening. The display segment is made of a transparent material, and the display segment can be vertical or curved. The material of the connecting segment can be the same as that of the display segment, or different.
[0029] In this embodiment, the detection tube 200 can be an integrally formed U-shaped transparent tube, the first tube opening of the detection tube 200 is connected to the first connecting port 110, and the second tube opening is connected to the second connecting port 120, so that the shell 100 and the detection tube 200 present a "kettle"-like structure.
[0030] When the electrolyte is injected into the accommodating chamber, the electrolyte will enter the detection tube 200. Since the pressure inside the accommodating chamber is the same, when the electrolyte is at rest, the electrolyte will automatically adjust its height so that the height in the accommodating chamber is consistent with the height entering the detection tube 200 to maintain pressure balance. Therefore, through the detection tube 200, the current height of the electrolyte can be intuitively seen, and the consumption of the electrolyte can be observed.
[0031] In some embodiments, the side wall of the first pipe opening is extended outwardly to be provided with a first connection portion, and the first connection portion is connected to the outer side wall of the shell. The contact area between the side wall of the first pipe opening and the shell is increased by the connection portion, so that the detection tube can be more stably installed on the shell. Similarly, the side wall of the second pipe opening is extended outwardly to be provided with a second connection portion, and the second connection portion is connected to the outer side wall of the shell.
[0032] In some embodiments, the detection tube and the accommodating cavity can be connected by inserting the side wall of the first pipe opening and the side wall of the second pipe opening into the accommodating groove respectively.
[0033] In summary, the present disclosure provides a battery electrolyte monitoring device and a battery testing device, which form a connected system by connecting the two ends of the detection tube 200 with the internal accommodating cavity of the shell 100. In this connected system, when the liquid 400 is in a static state, its internal pressure is equal, so the liquid 400 will automatically adjust its height to maintain pressure balance. Therefore, the height of the liquid 400 inside the shell 100 will be directly displayed in the transparent detection tube 200, thereby realizing the intuitive viewing of the electrolyte height or electrolyte consumption inside the shell 100, which helps to promptly discover safety problems existing in battery use.
[0034] In some embodiments, Figure 1 As shown, a first scale 210 is provided on the detection tube 200 .
[0035] In this embodiment, in order to more accurately calculate the consumed weight of the electrolyte according to the change of the liquid level in the detection tube 200, a first scale 210 is provided on the detection tube 200. According to the change value of the electrolyte liquid level in the detection tube 200, the weight of the electrolyte changed in the accommodating cavity and the weight of the electrolyte changed in the detection tube 200 can be calculated respectively.
[0036] For example, in this embodiment, the housing 100 is arranged in a cubic shape, and a cathode sheet, an anode sheet, and a diaphragm are arranged in the receiving tank. Therefore, when calculating the weight of the electrolyte in the receiving tank, the influence of the cathode sheet, the anode sheet, and the diaphragm on the space occupied by the receiving tank needs to be eliminated. The specific calculation formula is as follows:
[0037] Electrolyte consumption weight W = (L1*W1*h1-(L2*d1+L3*d2+L4*d3)*2*h1+3.14*(d4 / 2)2*h1)*p,
[0038] Among them, W is the weight of electrolyte consumption, L1 is the length of the shell 100, W1 is the width of the shell 100, L2 is the length of the cathode sheet, d1 is the thickness of the cathode sheet, L3 is the length of the anode sheet, d2 is the thickness of the anode sheet, L4 is the length of the diaphragm, d3 is the thickness of the diaphragm, d4 is the inner diameter of the transparent scale tube, p is the electrolyte density, and h1 is the height difference of the electrolyte liquid level in the detection tube 200.
[0039] In some embodiments, the first end of the detection tube 200 is connected to the side wall of the first communication port 110 by adhesive sealing.
[0040] In this embodiment, in order to improve the sealing of the connection between the first tube opening of the detection tube 200 and the first connecting port 110 and reduce the impact of electrolyte overflow on the electrolyte monitoring result, the first end of the detection tube 200 is connected to the side wall of the first connecting port 110 by glue. The glue can be made of a material with good corrosion resistance, such as AB glue, SIS hot melt double-sided tape (Styrene-Isoprene-Styrene Hot Melt Adhesive), or high-strength viscose fiber. The actual selection is combined with the specific properties of the electrolyte, and is not specifically limited here.
[0041] In some embodiments, the second end of the detection tube 200 is connected to the side wall of the second communication port 120 by adhesive sealing.
[0042] In order to further reduce the leakage of the electrolyte, the second end of the detection tube 200 is connected to the side wall of the second communication port 120 by adhesive sealing, so as to further improve the accuracy of the electrolyte monitoring result.
[0043] In some embodiments, Figure 2 As shown, it also includes a U-shaped tube 300, the material of the U-shaped tube 300 is a transparent material, the end of the shell 100 away from the first connecting port 110 is provided with a third connecting port 130, the third connecting port 130 is connected to the accommodating cavity, the first port of the U-shaped tube 300 is connected to the third connecting port 130, the second port of the U-shaped tube 300 is used to communicate with the outside, and the arc-shaped tube section of the U-shaped tube 300 faces the direction of the first connecting port 110, and the U-shaped tube 300 is provided with a liquid 400, and the volume of the liquid 400 is smaller than the internal volume of the U-shaped tube 300.
[0044] It is understandable that during the use of the battery, the electrolyte is gradually consumed, and some gas is produced. The gas will increase the internal pressure of the battery, causing the battery to swell, and even cause the explosion-proof valve to break, posing a safety hazard. Therefore, in this embodiment, a U-shaped tube 300 is added to communicate with the accommodating chamber to monitor the gas production during the consumption of the electrolyte.
[0045] The first port of the U-shaped tube 300 is connected to the third communication port 130 arranged near the top of the shell 100, and the arc-shaped tube section of the U-shaped tube 300 faces the bottom of the shell 100, so that the liquid 400 in the U-shaped tube 300 will not flow back into the accommodating chamber and affect the electrolyte. In actual use, since both ends of the detection tube 200 are connected to the accommodating chamber, the gas generated by the electrolyte is light in mass and it is difficult to break the pressure balance inside the accommodating chamber. Therefore, it is difficult for the gas to enter the detection tube 200, but it will flow to the third communication port 130, enter the U-shaped tube 300, and push the liquid 400 in the U-shaped tube 300 to move. During the movement of the liquid 400, since the second port of the U-shaped tube 300 is connected to the outside, as the liquid 400 moves, the air in the U-shaped tube 300 is gradually squeezed to the outside, so that the movement of the liquid 400 is smoother and the height change of the liquid 400 is more obvious. That is, through the arrangement of the U-tube 300 and the liquid 400, the gas production is converted into a change in the height of the liquid 400, and the gas production situation can be observed intuitively and conveniently through the change in the height of the liquid 400.
[0046] In some embodiments, Figure 2 As shown, a second scale 310 is provided on the U-shaped tube 300 .
[0047] In this embodiment, in order to accurately obtain the gas production, a second scale 310 is set to calculate the gas content entering the U-shaped tube 300 by the height change difference of the liquid 400.
[0048] The specific calculation formula for gas production volume is as follows:
[0049] Electrolyte gas production volume V = L1*W1*h1-(L2*d1+L3*d2+L4*d3)*h1+3.14*(d5 / 2)2*h2+3.14*(d4 / 2)2*h1,
[0050] Wherein, V is the gas production volume of the electrolyte, L1 is the length of the shell 100, W1 is the width of the shell 100, L2 is the length of the cathode sheet, d1 is the thickness of the cathode sheet, L3 is the length of the anode sheet, d2 is the thickness of the anode sheet, L4 is the length of the diaphragm, d3 is the thickness of the diaphragm, d5 is the inner diameter of the U-shaped tube 300, p is the electrolyte density, h1 is the height difference of the electrolyte liquid level in the transparent scale tube, and h2 is the height difference of the liquid level in the U-shaped tube 300.
[0051] In some embodiments, the side of the first port of the U-shaped tube 300 is connected to the side wall of the third communication port 130 by adhesive sealing.
[0052] In this embodiment, in order to reduce gas leakage, AB glue is used to connect the first port of the U-shaped tube 300 with the side wall of the third connecting port 130 to improve the accuracy of the gas production monitoring result. The connection method of the first port of the U-shaped tube 300 and the side wall of the third connecting port 130 is similar to the connection method of the detection tube 200 and the housing 100 in the above embodiment, and will not be repeated here to avoid repetition.
[0053] In some embodiments, Figure 3 As shown, it also includes a connecting member 500, a first clamping plate 600 and a second clamping plate 700. The shell 100 has a first clamping surface, a second clamping surface and a connecting surface 140. The first connecting port 110 and the second connecting port 120 are both opened on the connecting surface 140. The first clamping surface and the second clamping surface are respectively adjacent to the connecting surface 140. The first clamping surface and the second clamping surface are arranged opposite to each other. The first clamping plate 600 abuts against the first clamping surface, and the second clamping plate 700 abuts against the second clamping surface. The first clamping plate and the second clamping plate are connected through the connecting member 500.
[0054] In this embodiment, in order to reduce the situation where the generated gas causes the battery to bulge, a first clamp 600 and a second clamp 700 are provided on both sides of the shell 100, and the first clamp 600 and the second clamp 700 are always tightened to the shell 100 through the connecting piece 500, thereby reducing the deformation of the shell 100. On the other hand, after clamping the shell 100 to reduce the deformation of the shell 100, it helps to make more of the generated gas flow into the U-shaped tube 300, thereby improving the accuracy of the gas production monitoring results. In addition, the first clamp 600 and the second clamp 700 can also protect the detection tube 200 and the U-shaped tube 300, reduce the damage of the detection tube 200 and the U-shaped tube 300 due to external stress, and improve the stability of the structure of the entire battery electrolyte monitoring device.
[0055] In some embodiments, Figure 3As shown, the first clamping plate 600 is provided with a first connecting hole, and the second clamping plate 700 is provided with a second connecting hole, the first connecting hole and the second connecting hole are opened opposite to each other, the connecting member 500 includes a screw rod 510 and a nut 520, the length of the screw rod 510 is greater than the distance between the first clamping plate 600 and the second clamping plate 700 when the first clamping plate 600 and the second clamping plate 700 are abutted against the shell 100, the screw rod 510 passes through the first connecting hole and the second connecting hole in sequence and is screwed to the nut 520, the end of the screw rod 510 away from the nut 520 abuts against the side of the first clamping plate 600 facing away from the shell 100, and the nut 520 abuts against the side of the second clamping plate 700 facing away from the shell 100.
[0056] In this embodiment, after the first clamping plate 600 and the second clamping plate 700 are in contact with the housing 100, the screw rod 510 is inserted through the first connection hole and the second connection hole in sequence, and after the end of the screw rod 510 passes through the second connection hole, the nut 520 is installed at the end of the screw rod 510. As the nut 520 is gradually tightened, the first clamping plate 600 and the second clamping plate 700 gradually clamp the housing 100, and the two clamping plates are less likely to loosen.
[0057] In some embodiments, the connecting member may also be a spring, such as a torsion spring. The first clamping plate and the second clamping plate are respectively connected to the two torsion arms of the torsion spring. When in use, the first clamping plate and the second clamping plate are separately attached to the aluminum shell, and the torsion spring recovery structure generates torsion, and under the action of the torsion, the first clamping plate and the second clamping plate automatically clamp the shell.
[0058] In one embodiment, a battery testing device is provided, comprising the battery electrolyte monitoring device in any one of the above embodiments.
[0059] In this embodiment, based on the above embodiments, an application example of a battery testing device is provided.
[0060] The battery testing device includes a square aluminum shell of model 72173204, on which a detection tube and a U-shaped tube are connected. The connection between the detection tube and the U-shaped tube and the aluminum shell is sealed with AB glue, and the detection tube and the U-shaped tube are both provided with scales. An aluminum shell battery cell is provided in the accommodating cavity inside the aluminum shell. The specific parameter values of each part are as follows:
[0061] The inner diameter of the transparent graduated tube is 0.4 mm;
[0062] U-tube 300 manometer internal diameter 10mm;
[0063] Aluminum shell parameters: 72*173*204mm (length*width*height)
[0064] Aluminum shell internal material parameters: cathode thickness 0.15mm, anode thickness 0.125mm; diaphragm 0.012mm, cathode length 17000mm; anode length 17010mm; diaphragm length 35000mm, electrolyte injection volume 1000g, electrolyte density 1.2g / cm 3 ;
[0065] The initial state of the electrolyte inside the aluminum shell battery is as follows Figure 4 As shown in Figure 2, after the aluminum shell battery has completed 1000 complete charge and discharge cycles, its electrolyte consumption and gas production are as follows: Figure 5 shown.
[0066] Calculation results:
[0067] Electrolyte consumption weight
[0068] W=(72*173*10-
[0069] (0.15*17000+0.125*17010+35000*0.012)*2*10+3.14*0.4*10)*1.2 / 1000=122.64g;
[0070] Electrolyte gas production:
[0071] V=72*173*10+3.14*(10 / 2)2+3.14*(4 / 2)2*10=1244.7cm 3 .
[0072] It should be noted that in the present disclosure, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element limited by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.
[0073] Although the embodiments disclosed in the present disclosure are as above, the above contents are only embodiments adopted for facilitating the understanding of the present disclosure and are not intended to limit the present disclosure. Any technician in the technical field to which the present disclosure belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present disclosure, but the scope of patent protection of the present disclosure shall still be subject to the scope defined in the attached claims.
Claims
1. A battery electrolyte monitoring device, characterized in that: include: A shell and a detection tube, wherein the detection tube is made of a transparent material, a housing cavity is provided in the shell, a first communication port is provided at a position close to the first end of the shell, a second communication port is provided at a position close to the second end of the shell, the first communication port and the second communication port are respectively connected with the housing cavity, a first pipe port is provided at the first end of the detection tube, the first pipe port is connected with the first communication port, a second pipe port is provided at the second end of the detection tube, the second pipe port is connected with the second communication port.
2. The battery electrolyte monitoring device according to claim 1, characterized in that: The detection tube is provided with a first scale.
3. The battery electrolyte monitoring device according to claim 1, characterized in that: The first end of the detection tube is sealed and connected to the side wall of the first communication port by adhesive.
4. The battery electrolyte monitoring device according to claim 1, characterized in that: The second end of the detection tube is sealed and connected to the side wall of the second communication port by adhesive.
5. The battery electrolyte monitoring device according to claim 1, characterized in that: It also includes a U-shaped tube, which is made of a transparent material. A third connecting port is opened at one end of the shell away from the first connecting port. The first port of the U-shaped tube is connected to the third connecting port. The second port of the U-shaped tube is used to communicate with the outside, and the arc-shaped tube section of the U-shaped tube faces the direction where the first connecting port is located. Liquid is arranged in the U-shaped tube, and the volume of the liquid is smaller than the internal volume of the U-shaped tube.
6. The battery electrolyte monitoring device according to claim 5, characterized in that: The U-shaped tube is provided with a second scale.
7. The battery electrolyte monitoring device according to claim 5, characterized in that: The first port of the U-shaped tube is connected to the side wall of the third communication port by adhesive sealing.
8. The battery electrolyte monitoring device according to claim 1, characterized in that: It also includes a connecting piece, a first clamping plate and a second clamping plate. The shell has a first clamping surface, a second clamping surface and a connecting surface. The first connecting port and the second connecting port are both opened on the connecting surface. The first clamping surface and the second clamping surface are respectively adjacent to the connecting surface. The first clamping surface and the second clamping surface are arranged opposite to each other. The first clamping plate abuts against the first clamping surface, and the second clamping plate abuts against the second clamping surface. The first clamping plate and the second clamping plate are connected by the connecting piece.
9. The battery electrolyte monitoring device according to claim 8, characterized in that: The first clamping plate is provided with a first connecting hole, and the second clamping plate is provided with a second connecting hole. The first connecting hole and the second connecting hole are opened opposite to each other. The connecting member includes a screw and a nut. The length of the screw is greater than the distance between the first clamping plate and the second clamping plate when the first clamping plate and the second clamping plate abut against the shell. The screw passes through the first connecting hole and the second connecting hole in sequence and is threadedly connected to the nut. The end of the screw away from the nut abuts against the side of the first clamping plate facing away from the shell, and the nut abuts against the side of the second clamping plate facing away from the shell.
10. A battery testing device, characterized in that: The invention comprises a battery electrolyte monitoring device as described in any one of claims 1 to 9.