Measuring device

Abstract

The utility model provides a measuring device. The measuring device comprises a fixing assembly, a force sensor and a force transmission assembly. The fixing assembly comprises a first fixing part and a second fixing part, and the first fixing part and the second fixing part are arranged in a spaced mode and relatively fixed. The force sensor is arranged on the second fixing part and located on the side, close to the first fixing part, of the second fixing part. The force transmission assembly is arranged between the first fixing part and the force sensor, one end of the force transmission assembly abuts against the force sensor, the other end of the force transmission assembly and the first fixing part are arranged in a spaced mode, so that a battery cell installation space is formed in the spaced position, and the battery cell installation space is used for installing a to-be-tested battery cell. According to the measuring device, the direct contact between the high-temperature area with the thermal runaway of the battery cell and the force sensor can be avoided, so that the influence of the temperature on the measurement data of the force sensor can be reduced, and the measurement accuracy can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to battery technology, in particular to a measuring device. BACKGROUND

[0002] Lithium ion batteries can cause continuous heat accumulation inside the battery under abnormal conditions, abnormal temperature rise, and further cause the positive and negative electrodes inside the battery to heat up themselves, or directly short circuit, heat cannot be diffused, and eventually may cause the battery to catch fire or even explode, i.e. battery thermal runaway.

[0003] In related technologies, by testing the internal pressure change of the battery during thermal runaway, the safety performance of the battery can be evaluated, and the possible dangers such as fire or explosion of the battery under abnormal conditions can be predicted, to provide a scientific basis for safety measures of electric vehicles, further improve the safety and reliability of electric vehicles, and realize green travel and sustainable development.

[0004] However, in related technologies, the process of lithium ion battery thermal runaway measurement is easily disturbed by the environment temperature, so that the measurement result is prone to error, the measurement accuracy is poor, and the precision is limited. CONTENT OF THE INVENTION

[0005] The embodiment of the present application provides a measuring device, which can improve the accuracy of measurement.

[0006] The technical scheme of the embodiment of the present application is as follows:

[0007] The embodiment of the present application provides a measuring device, which comprises:

[0008] A fixing assembly, the fixing assembly comprises a first fixing part and a second fixing part, the first fixing part and the second fixing part are arranged at intervals and are fixed relative to each other;

[0009] A force sensor, the force sensor is arranged on the second fixing part and located on the side of the second fixing part close to the first fixing part;

[0010] A force transmission assembly, the force transmission assembly is arranged between the first fixing part and the force sensor, one end of the force transmission assembly abuts against the force sensor, and the other end of the force transmission assembly is arranged at intervals with the first fixing part, so that an interval forms a battery cell mounting space, and the battery cell mounting space is used for mounting a battery cell to be measured.

[0011] In an embodiment, the force transmission assembly comprises a clamping plate and a force transmission rod, one end of the force transmission rod abuts against the force sensor, the clamping plate is arranged at the end of the force transmission rod away from the force sensor, and the clamping plate is arranged at intervals with the first fixing part to form the battery cell mounting space.

[0012] In one embodiment, the fixing assembly comprises at least one support rod, opposite ends of the support rod are connected with the first fixing part and the second fixing part respectively, so that the first fixing part and the second fixing part are fixed relative to each other.

[0013] In one embodiment, the fixing assembly comprises at least one support rod, opposite ends of the support rod are connected with the first fixing part and the second fixing part respectively, so that the first fixing part and the second fixing part are fixed relative to each other.

[0014] The clamping plate has at least one first through hole, and the support rod is correspondingly arranged in the first through hole, so that the clamping plate is slidably arranged on the support rod.

[0015] In one embodiment, the measuring device further comprises at least one first bearing, the first bearing is correspondingly arranged at the first through hole, and the support rod is correspondingly arranged in the first bearing.

[0016] In one embodiment, the fixing assembly further comprises a support plate, the support plate has a second through hole and at least one third through hole, the force transmission rod is slidably arranged in the second through hole, and the support rod is correspondingly arranged in the third through hole, so that the support plate and the support rod are fixed relative to each other.

[0017] In one embodiment, the fixing assembly further comprises a support plate, the support plate has a plurality of third through holes, the fixing assembly comprises a plurality of support rods, the support rods are correspondingly arranged in the third through holes, and the support plate and the support rods are fixed relative to each other.

[0018] In one embodiment, the measuring device further comprises a second bearing, the second bearing is arranged at the second through hole, and the force transmission rod is slidably arranged in the second bearing.

[0019] In one embodiment, the fixing assembly further comprises a guide rail seat and a third bearing, the guide rail seat is connected with at least one of the first fixing part and the second fixing part, the third bearing is arranged on the guide rail seat, and the force transmission rod is slidably arranged in the third bearing.

[0020] In one embodiment, the cross-sectional dimension of the clamping plate is greater than or equal to the cross-sectional dimension of the to-be-measured battery cell.

[0021] The embodiments of the present application have the following beneficial effects:

[0022] The embodiment of the present application provides a measuring device, which comprises a fixing assembly, a force sensor and a force transmission assembly. The fixing assembly comprises a first fixing part and a second fixing part, and the first fixing part and the second fixing part are arranged in a spaced manner and are fixed oppositely. The force sensor is arranged on the second fixing part and is located on the side of the second fixing part close to the first fixing part. The force transmission assembly is arranged between the first fixing part and the force sensor, one end of the force transmission assembly is in abutment with the force sensor, and the other end of the force transmission assembly is arranged in a spaced manner with the first fixing part, so that a space is formed between the first fixing part and the second fixing part for installing a battery cell to be measured. Therefore, when the battery cell to be measured produces gas due to thermal runaway, the force transmission assembly can move towards the side close to the force sensor, so as to apply a pushing force on the force sensor. The greater the internal pressure in the process of thermal runaway of the battery cell to be measured is, the greater the pushing force transmitted by the force transmission assembly to the force sensor is, and the greater the value detected by the force sensor is. Therefore, a better measurement effect can be achieved. Meanwhile, since the force sensor is not directly attached to the battery cell to be measured, but transmits force through the force transmission assembly, the high-temperature area of the battery cell to be measured can be prevented from directly contacting the force sensor, so that the influence of temperature on the measurement data of the force sensor can be reduced, the measurement data can be prevented from drifting with temperature as much as possible, and the measurement accuracy can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 1 is a structural schematic diagram of a measuring device provided by the embodiment of the present application;

[0024] Figure 2 FIG. 2 is another partial enlarged view of A in FIG. 1; Figure 1

[0025] Figure 3 FIG. 3 is a schematic diagram of the cooperation relationship of the first fixing part, the battery cell to be measured and the clamping plate in FIG. 1. Figure 1

[0026] Legend of reference signs

[0027] 10, fixing assembly; 10a, battery cell installation space; 11, first fixing part; 12, second fixing part; 13, support rod; 14, support plate; 14a, second via hole; 14b, third via hole; 20, force sensor; 30, force transmission assembly; 31, clamping plate; 31a, first via hole; 32, force transmission rod; 40, first bearing; 50, second bearing; 60, battery cell to be measured. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings, and the described embodiments should not be regarded as limitation to the present application. All other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.​​

[0029] In the description of the embodiments of the present application, the technical terms "first", "second", "third" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two and more than two, unless otherwise explicitly specified.

[0030] Unless otherwise defined, all technical and scientific terms used in the embodiments of the present application have the same meanings as those commonly understood by those skilled in the art. The terms used in the embodiments of the present application are only for the purpose of describing the embodiments of the present application, and are not intended to limit the present application.

[0031] An embodiment of the present application provides a measuring device, please refer to Figure 1 and Figure 2 The measuring device comprises a fixing assembly 10, a force sensor 20 and a force transmission assembly 30.

[0032] The fixing assembly 10 comprises a first fixing part 11 and a second fixing part 12, which are arranged in a spaced manner and are relatively fixed.

[0033] The force sensor 20 is arranged on the second fixing part 12 and located on the side of the second fixing part 12 close to the first fixing part 11.

[0034] The force transmission assembly 30 is arranged between the first fixing part 11 and the force sensor 20, one end of the force transmission assembly 30 abuts against the force sensor 20, and the other end of the force transmission assembly 30 is arranged in a spaced manner with the first fixing part 11, so that the space forms a battery cell mounting space 10a for mounting the battery cell 60 to be measured.

[0035] Specifically, the measuring device is used to measure the battery cell, and for the convenience of description, the present application takes the measuring device for measuring the internal pressure of the battery cell in thermal runaway as an example for description.

[0036] The first fixing part 11 is used to fix the battery cell 60 to be measured, and the second fixing part 12 is used to fix the force sensor 20.

[0037] The specific shape of the first fixing part 11 and the second fixing part 12 is not limited, such as plate-shaped, block-shaped, columnar or other shapes.

[0038] The first fixing part 11 and the second fixing part 12 are relatively fixed, that is, the positional relationship between the two is fixed and unchanged during the test of the measuring device.

[0039] It should be noted that the specific way of keeping the first fixing part 11 and the second fixing part 12 relatively fixed is not limited.

[0040] For example, please refer to Figure 1 and Figure 2 The fixed assembly 10 includes at least one support rod 13, and the opposite ends of the support rod 13 are connected with the first fixed part 11 and the second fixed part 12 respectively, so that the first fixed part 11 and the second fixed part 12 are relatively fixed. In this way, the relative fixed positional relationship between the two can be maintained conveniently.

[0041] That is, the first fixed part 11 and the second fixed part 12 are connected together by arranging the support rod 13. Among them, the fixed assembly 10 can be to fix and connect the first fixed part 11 and the second fixed part 12 by only one support rod 13, or can be to fix and connect the first fixed part 11 and the second fixed part 12 by multiple support rods 13.

[0042] It should be noted that the connection mode of the support rod 13 with the first fixed part 11 and the connection mode of the support rod 13 with the second fixed part 12 can be a non-detachable connection mode such as welding, so as to improve the connection stability. Alternatively, a movable connection mode such as clamping and fastening connection can be adopted, so as to facilitate the adjustment of the relative positional relationship between the first fixed part 11 and the second fixed part 12 before the battery cell test. In fact, no matter what connection mode is adopted, the first fixed part 11 and the second fixed part 12 should be relatively fixed during the battery cell test.

[0043] In other embodiments, the first fixed part 11 and the second fixed part 12 can not be connected, but only maintain a relative fixed positional relationship.

[0044] The end of the force transmission assembly 30 close to the first fixed part 11 is used to abut against the battery cell 60 to be tested, so as to clamp the battery cell 60 to be tested together with the first fixed part 11, so that the battery cell 60 to be tested is located in the battery cell mounting space 10a.

[0045] The end of the force transmission assembly 30 close to the second fixed part 12 is used to abut against the force sensor 20, and the force sensor 20 is arranged on the second fixed part 12. In this way, during the battery cell thermal runaway test, the force transmission assembly 30 can move and push the force sensor 20, so as to convert the internal pressure of the battery cell thermal runaway into a pushing force acting on the force sensor 20, so as to facilitate the monitoring of the force sensor 20.

[0046] It should be noted that the measurement by the force sensor 20 can achieve the purpose of real-time monitoring, can timely discover and handle potential safety hazards, and can improve the safety of the battery.

[0047] In the measuring device in the embodiments of the present application, when the gas generated by the thermal runaway of the to-be-measured battery 60 causes the battery shell to expand, the force transmission assembly 30 can move towards the side close to the force sensor 20 to apply a pushing force on the force sensor 20. The greater the internal pressure during the thermal runaway of the to-be-measured battery 60, the greater the pushing force transmitted by the force transmission assembly 30 to the force sensor 20, and the greater the value detected by the force sensor 20. Thus, a better measurement effect can be achieved. Meanwhile, since the force sensor 20 is not directly attached to the to-be-measured battery 60 but is separated from the to-be-measured battery 60 by the force transmission assembly 30 to transmit force, the high-temperature area of the battery during thermal runaway can be prevented from directly contacting the force sensor 20, thereby reducing the influence of temperature on the measurement data of the force sensor 20 and avoiding the measurement data from drifting with temperature as much as possible, and thus the accuracy of the measurement can be improved.

[0048] In the related art, there is also a technical solution of installing a sensor inside a battery for testing. However, this may change the structure and performance of the battery and affect the normal use of the battery. In addition, the installation of the sensor may increase the safety risk of the battery.

[0049] The measuring device in the embodiments of the present application measures by using an external force sensor 20, which can realize real-time measurement of the internal pressure of the battery during thermal runaway without interfering with the structure of the battery.

[0050] In an embodiment, referring to Figure 1 , the force transmission assembly 30 includes a clamping plate 31 and a force transmission rod 32. One end of the force transmission rod 32 is in abutment with the force sensor 20, and the clamping plate 31 is arranged at the end of the force transmission rod 32 away from the force sensor 20. The clamping plate 31 is spaced apart from the first fixing portion 11 to form a battery mounting space 10a. Thus, by arranging the clamping plate 31, the clamping plate 31 can be conveniently attached to the to-be-measured battery 60, and the change in gas pressure in the battery can be better reflected. Meanwhile, by arranging the force transmission rod 32 in abutment with the force sensor 20, force transmission can be better facilitated.

[0051] Specifically, according to the force balance relationship, the following equation is obtained: force sensor 20 reading = internal pressure acting area S x thermal runaway internal pressure p.

[0052] During the thermal runaway test of the battery, the force sensor 20 can collect the axial force value of the force transmission rod 32 in real time. Combined with the above equation, the real-time gas pressure change in the battery shell during thermal runaway (i.e., thermal runaway internal pressure p = force sensor 20 reading / internal pressure acting area S) can be obtained.

[0053] Thus, by using the clamping plate 31 to attach to the battery, the contact area of the clamping plate 31 and the battery can be increased, and the test result can be more accurate.

[0054] It should be noted that the specific size of the clamping plate 31 can be set according to actual conditions.

[0055] For example, please refer to Figure 1 and Figure 3 The cross-sectional dimension of the clamping plate 31 is greater than or equal to the cross-sectional dimension of the battery cell 60 to be measured. That is, the battery cell 60 to be measured is within the coverage of the clamping plate 31, and the internal pressure acting area is the large surface dimension of the battery cell shell, thereby further improving the accuracy of the measurement.

[0056] In addition, the connection mode of the clamping plate 31 and the force transmission rod 32 is not limited.

[0057] For example, the force transmission assembly 30 further comprises a fixing flange arranged on the clamping plate 31, and the end of the force transmission rod 32 close to the clamping plate 31 is connected with the fixing flange. In this way, the connection stability of the clamping plate 31 and the force transmission rod 32 can be improved.

[0058] In an embodiment, please refer to Figure 1 The fixing assembly 10 comprises at least one support rod 13, and the opposite ends of the support rod 13 are respectively connected with the first fixing part 11 and the second fixing part 12, so that the first fixing part 11 and the second fixing part 12 are relatively fixed.

[0059] The clamping plate 31 has at least one first through hole 31a, and the support rod 13 is correspondingly arranged in the first through hole 31a, so that the clamping plate 31 is slidably arranged on the support rod 13. In this way, by arranging the support rod 13, the movement of the clamping plate 31 can be guided in the battery cell thermal runaway test, and the problem that the force transmission rod 32 is bent and skewed due to its own gravity and further causes the test data of the force sensor 20 to be incorrect can be avoided as much as possible.

[0060] Specifically, the clamping plate 31 can have only one first through hole 31a, or can have a plurality of first through holes 31a, and one support rod 13 is arranged in each first through hole 31a.

[0061] It should be noted that the support rod 13 is not fixed in the first through hole 31a, but can slide relative to the first through hole 31a. In this way, the clamping plate 31 can slide relative to the support rod 13. During the battery cell thermal runaway test, the support rod 13 can guide the clamping plate 31 to slide to transmit the force to the force sensor 20. At the same time, the support rod 13 will not greatly affect the force transmission effect of the support rod 13, and the accuracy of the measurement data of the force sensor 20 can be improved.

[0062] In an embodiment, the fixing assembly 10 includes four support rods 13, the first fixing part 11 is a first fixing plate, the second fixing part 12 is a second fixing plate, the four support rods 13 are respectively connected to four corner positions of the first fixing plate and the second fixing plate, the clamping plates 31 are respectively in sliding connection with the support rods 13, and the force transmission rod 32 is connected to the center position of the clamping plate 31 at one end close to the clamping plate 31. In this way, the force transmission assembly 30 can transmit force more smoothly.

[0063] In an embodiment, referring to Figure 1 , the measuring device further includes at least one first bearing 40, the first bearing 40 is arranged at the first through hole 31a one by one, and the support rod 13 is arranged in the first bearing 40 one by one. In this way, the frictional force applied by the support rod 13 to the clamping plate 31 during the movement of the force transmission assembly 30 can be reduced, and the measurement accuracy of the force sensor 20 can be further improved.

[0064] In an embodiment, referring to Figure 1 , the fixing assembly 10 further includes a support plate 14, the support plate 14 has a second through hole 14a and at least one third through hole 14b, the force transmission rod 32 is slidably arranged in the second through hole 14a, the support rod 13 is arranged in the third through hole 14b one by one, and the support plate 14 is relatively fixed with the support rod 13. In this way, by arranging the support plate 14, the bending of the support rod 13 and the force transmission rod 32 can be avoided, the guiding effect of the support rod 13 can be better maintained, and the force transmission rod 32 can be guided to move towards the side close to the force sensor 20, so that the force transmission rod 32 can better transmit force.

[0065] Specifically, in addition to the second through hole 14a for the force transmission rod 32 to pass through, the support plate 14 can have only one third through hole 14b for the support rod 13 to pass through, or have multiple third through holes 14b for multiple support rods 13 to pass through the third through holes 14b one by one. In this way, the support plate 14 can better maintain the relative stability between the support rod 13 and the force transmission rod 32, can facilitate the guiding of the support rod 13, and can facilitate the force transmission of the force transmission rod 32.

[0066] For example, referring to Figure 1 , the fixing assembly 10 further includes a support plate 14, the support plate 14 has multiple third through holes 14b, the fixing assembly 10 includes multiple support rods 13, the support rods 13 are arranged in the third through holes 14b one by one, and the support plate 14 is relatively fixed with the support rods 13. In this way, the bending and skewing of each support rod 13 can be avoided as much as possible, the relative stability between each support rod 13 can be maintained, and the overall stability of the fixing assembly 10 can be improved.

[0067] The support plate 14 is relatively fixed with the support rod 13, and it is to be noted that the support plate 14 and the support rod 13 can be fixed in a non-detachable manner such as welding, or can be fixed in a detachable manner such as fastening connection or clamping.

[0068] It is to be noted that the force transmission rod 32 is not fixed in the second through hole 14a, and can slide relative to the second through hole 14a, and the specific connection manner between the two can be set according to actual conditions.

[0069] Exemplarily, referring to Figure 1 The measuring device further comprises a second bearing 50, the second bearing 50 is arranged at the second through hole 14a, and the force transmission rod 32 is slidably arranged in the second bearing 50. Thus, during the movement of the force transmission assembly 30, the frictional force applied by the support plate 14 to the force transmission rod 32 can be reduced, and the measurement accuracy of the force sensor 20 can be further improved.

[0070] In an embodiment, the fixing assembly 10 further comprises a guide rail seat and a third bearing, the guide rail seat is connected with at least one of the first fixing part 11 and the second fixing part 12, and the third bearing is arranged on the guide rail seat and the force transmission rod 32 is slidably arranged in the third bearing. Thus, the sliding of the force transmission rod 32 can be better guided, and the risk of the force transmission rod 32 being skewed can be reduced.

[0071] Specifically, the guide rail seat can be fixedly connected with only the first fixing part 11, or can be fixedly connected with only the second fixing part 12, or can be fixedly connected with both the first fixing part 11 and the second fixing part 12.

[0072] By arranging the third bearing, the frictional force applied by the guide rail seat to the force transmission rod 32 can be reduced, and thus the measurement accuracy of the force sensor 20 can be further improved.

[0073] In the description of the present application, the description of the terms “in an embodiment”, “in some embodiments”, “in a specific embodiment”, or “exemplarily” means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the embodiments of the present application. In the present application, the exemplary description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the person skilled in the art can combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0074] The above descriptions are only the preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, and the like made within the principle and technical scope of the present application are included in the protection scope of the present application.

Claims

1. A measuring device, characterized in that The measurement device comprises: a fixing assembly comprising a first fixing part and a second fixing part, the first fixing part and the second fixing part being spaced apart and fixed relative to each other; a force sensor arranged on the second fixing part and located on a side of the second fixing part close to the first fixing part; a force transmission assembly arranged between the first fixing part and the force sensor, one end of the force transmission assembly being in abutment with the force sensor, and the other end of the force transmission assembly being spaced apart from the first fixing part to form an electrode installation space at the spacing, the electrode installation space being used for installing an electrode to be measured.

2. The measuring device of claim 1, wherein, The force transmission assembly comprises a clamping plate and a force transmission rod, one end of the force transmission rod being in abutment with the force sensor, and the clamping plate being arranged at an end of the force transmission rod away from the force sensor and spaced apart from the first fixing part to form the electrode installation space.

3. The measuring device according to claim 1 or 2, characterized in that The fixing assembly comprises at least one support rod, opposite ends of the support rod being connected with the first fixing part and the second fixing part respectively, so that the first fixing part and the second fixing part are fixed relative to each other.

4. The measuring device of claim 2, wherein, The fixing assembly comprises at least one support rod, opposite ends of the support rod being connected with the first fixing part and the second fixing part respectively, so that the first fixing part and the second fixing part are fixed relative to each other. The clamping plate has at least one first through hole, and the support rod is correspondingly arranged in the first through hole, so that the clamping plate is slidably arranged on the support rod.

5. The measuring device of claim 4, wherein, The measurement device further comprises at least one first bearing arranged at the first through hole, and the support rod is correspondingly arranged in the first bearing.

6. The measuring device according to claim 4 or 5, characterized in that The fixing assembly further comprises a support plate, the support plate having a second through hole and at least one third through hole, the force transmission rod being slidably arranged in the second through hole, and the support rod being correspondingly arranged in the third through hole, so that the support plate is fixed relative to the support rod.

7. The measuring device according to claim 4 or 5, characterized in that The fixing assembly further comprises a support plate, the support plate having a plurality of third through holes, the fixing assembly comprising a plurality of support rods, the support rods being correspondingly arranged in the third through holes, and the support plate being fixed relative to the support rods.

8. The measuring device of claim 6, wherein, The measurement device further comprises a second bearing arranged at the second through hole, and the force transmission rod is slidably arranged in the second bearing.

9. The measuring device according to claim 2 or 4, characterized in that The fixing assembly further comprises a guide rail seat connected with at least one of the first fixing part and the second fixing part, and a third bearing arranged on the guide rail seat, and the force transmission rod is slidably arranged in the third bearing.

10. The measuring device according to claim 2 or 4, characterized in that The clamping plate has a cross-sectional dimension greater than or equal to a cross-sectional dimension of the electrode to be measured.

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