CN114440754A - Device and method for testing swelling capacity of multiple batteries under different pressures - Google Patents
Device and method for testing swelling capacity of multiple batteries under different pressures Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000008961 swelling Effects 0.000 title claims description 28
- 238000003825 pressing Methods 0.000 claims abstract description 83
- 239000011229 interlayer Substances 0.000 claims abstract description 61
- 238000006073 displacement reaction Methods 0.000 claims abstract description 39
- 230000000712 assembly Effects 0.000 claims abstract description 27
- 238000000429 assembly Methods 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims abstract description 15
- 230000009286 beneficial effect Effects 0.000 claims description 10
- 125000004122 cyclic group Chemical group 0.000 claims description 3
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- 101100134058 Caenorhabditis elegans nth-1 gene Proteins 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
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- G—PHYSICS
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
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Abstract
The invention provides a device and a method for testing the expansion amount of a plurality of batteries under different pressures, wherein the device comprises a base, a bracket retainer and a guide rod vertically fixed on the base; a plurality of movable platen assemblies, and displacement readers on the movable platens; the battery is clamped between the base and the first movable pressing plate and every two adjacent movable pressing plates, the multiple interlayer batteries are connected in series, constant pressure borne by each interlayer battery is equal to weight combination above the interlayer battery, constant pressure borne by different interlayer batteries is different, the displacement reader obtains the expansion amount of each interlayer battery in the charging and discharging circulation process respectively and then selects the optimal constant pressure value of the batch of batteries, and the battery testing device has the advantages of being high in testing efficiency, high in precision, low in cost, strong in practicability, simple in operation and the like, and further solves the problems of complex operation, high implementation difficulty, high cost, low in testing efficiency and low in precision in the prior art.
Description
Technical Field
The invention relates to the technical field of battery development, in particular to a device and a method for testing the expansion amount of a plurality of batteries under different pressures.
Background
In the process of developing the lithium battery, the pressure born by the battery has very obvious influence on the swelling capacity and the cycle life of the battery. The testing of the influence of different pressures born by the lithium battery in the charging and discharging circulation process on the expansion amount and the circulation life is very important. At present, a method for applying constant pressure to a battery and testing the swelling amount in the charge-discharge cycle process generally adopts a servo motor or an electric cylinder to apply pressure, a pressure sensor is used for collecting the pressure applied to the battery, and a control system is used for adjusting the reduction amount of the servo motor or the electric cylinder so as to ensure that the battery bears the constant pressure. While the swelling amount of the battery was tested by a displacement reader mounted on the battery. The testing method has the problems of high implementation difficulty, complex control and high cost, and can generally test only one battery.
If the application number is: CN201922024734.4, a chinese patent discloses a square lithium battery electrical performance cycle testing device, which comprises a bottom plate, wherein the upper surface of the bottom plate is fixedly connected with a fixed end plate and an open end plate which are distributed in parallel, at least one movable pressing plate is arranged between the fixed end plate and the open end plate in parallel, guide rods symmetrically penetrate through the movable pressing plate, and two end portions of the guide rods are fixedly connected with the fixed end plate and the open end plate respectively; an L-shaped pressing plate which transversely moves relative to the movable pressing plate is arranged on one side of the opening end plate, a notch through which the L-shaped pressing plate passes is formed in the opening end plate, and a pressure sensor is arranged on the surface, facing the movable pressing plate, of the L-shaped pressing plate; and a driving device for transversely moving the L-shaped pressing plate is also fixed on the bottom plate.
For example, chinese patent application No. CN201811644548.4 discloses a method for testing expansion force of a battery module, which includes the following steps: step S210: manufacturing a plurality of identical battery modules; step S220: respectively placing each battery module into a measuring clamp of the expansive force testing device, applying different initial pre-tightening force values to the battery modules, and setting a data sampling period and a data display format in a pressure sensor display instrument of the expansive force testing device; step S230: connecting the positive electrode and the negative electrode of the corresponding battery module with the charge and discharge test cabinet, measuring the expansion force value of the battery module under each initial pre-tightening force value, and reading the expansion force value in the pressure sensor display instrument; step S240: and obtaining a change curve of the expansion force according to the expansion force values corresponding to the different initial pretension values. In the step S220, initial pre-tightening force values with different magnitudes are applied to the battery module 10 by adjusting the position of the lead screw 8 of the expansion force testing device. By the method, different initial pretightening forces can be adjusted for all the battery modules 10 by using one expansion force testing device through the adjusting screw rods 8.
The following steps are repeated: chinese patent with application No. cn201910038216.x discloses a battery swelling force measuring device, which includes: a support stand; at least two guide rods; the first movable flat plate and the second movable flat plate are arranged perpendicular to the guide rods and penetrate through the guide rods respectively, and the first movable flat plate is suitable for being in contact with a battery placed between the first movable flat plate and the base; a force sensor disposed between the first movable plate and the second movable plate, the force sensor adapted to detect a force of a surface of a battery; a force sensor array disposed on a bottom surface of the first movable plate, the force sensor array adapted to detect a force distribution on a surface of a battery; and the data acquisition and processing device is respectively electrically connected with the force sensor, the force sensor array and the micro-displacement adjusting device, is suitable for receiving a force signal from the force sensor, a force distribution signal from the force sensor array and a displacement signal from the micro-displacement adjusting device, and is suitable for sending a control signal to the micro-displacement adjusting device.
From the above, it can be seen that: the method for testing the expansion force of the battery in the prior art comprises the steps that the pressing amount is adjusted through a control system to adjust a servo motor or an electric cylinder so as to ensure that the battery bears constant pressure, when the constant pressure is changed, the pressing amount of the servo motor or the electric cylinder needs to be adjusted, and the expansion amount of a plurality of interlayer batteries can not be tested at the same time under different pressures.
Disclosure of Invention
In view of this, the invention provides a device and a method for testing the swelling capacity of a plurality of batteries under different pressures, the constant pressure applied to each interlayer battery is equal to the weight combination above the interlayer battery, so that the batteries of different interlayers are simultaneously subjected to different constant pressures, and the swelling capacity of each interlayer battery in the charge-discharge cycle process is respectively obtained through a plurality of displacement readers, so that the beneficial effect of simultaneously testing the swelling capacity of the plurality of interlayer batteries under different pressures is realized.
In order to achieve the above object, an aspect of the present invention provides an apparatus for testing expansion of a plurality of batteries under different pressures, including a base, a rack holder, a testing space formed between the rack holder and the base, and at least two guide rods vertically fixed on the base; the movable pressing plate assemblies comprise movable pressing plates and displacement readers arranged on the movable pressing plates, the movable pressing plates slide up and down along the guide rods, and interlayer batteries are clamped between the base and the first movable pressing plate and between two adjacent movable pressing plates;
the interlayer batteries in each interlayer are connected in series, the interlayer batteries in different interlayers have different constant pressures, the constant pressure applied to each interlayer battery is equal to the weight combination above the interlayer battery, and the displacement reader reads the expansion amount of the interlayer battery below the interlayer battery in the charge-discharge cycle process.
Further, the weight combination above a certain sandwiched battery is the sum of the weight of all the movable pressing plate assemblies above the sandwiched battery and the weight of all the sandwiched batteries.
Further, the weight of any two of the movable platen assemblies may be the same or different in the movable platen assemblies.
Furthermore, a through hole is formed in the movable pressing plate, a guide shaft sleeve which is beneficial to the movable pressing plate to slide up and down is installed on the through hole, and the inner diameter of the guide shaft sleeve is matched with the outer diameter of the guide rod.
Furthermore, a first battery is arranged between the base and the first movable pressing plate, an Nth battery is arranged between the Nth-1 th movable pressing plate and the Nth movable pressing plate, the first battery and the Nth battery are sequentially connected in series, wherein N is a positive integer, and N is more than or equal to 2 and less than or equal to 10.
Further, the number of the movable platen assemblies is six.
Furthermore, a magnetic cylinder is fixedly connected to the base, and a magnetic strip is arranged on the side face, close to the displacement reader, of the magnetic cylinder.
Furthermore, a holding part is arranged on the movable pressing plate.
In another aspect of the present invention, there is provided a method for testing swelling of a plurality of batteries under different pressures, the method using the above apparatus for testing swelling of a plurality of batteries under different pressures, the method comprising the steps of:
step S10: clamping each interlayer battery between the base and the first movable pressing plate and between two adjacent movable pressing plates respectively, wherein the constant pressure applied to each interlayer battery is equal to the weight combination above the interlayer battery;
step S20: connecting all the interlayer batteries in series in sequence;
step S30: carrying out cyclic charge and discharge on the battery;
step S40: during the charge-discharge cycle, the displacement reader reads the amount of swelling of the underlying sandwich battery.
Further, the sum of the weight of all movable platen assemblies above a certain sandwiched cell and the weight of all sandwiched cells results in the weight combination of the sandwiched cell in the step S10.
As a preferred embodiment, the method for testing the swelling amount of a plurality of batteries under different pressures adopts the above device for testing the swelling amount of a plurality of batteries under different pressures, and the method comprises the following steps:
step S100: a first battery is clamped between the base and the first movable pressing plate, a second battery and an Nth battery … … are sequentially clamped upwards, and the Nth battery is clamped between the Nth-1 movable pressing plate and the Nth movable pressing plate; the constant pressure borne by the first battery is the sum of the weights of the second movable plate assembly to the Nth movable plate assembly and the sum of the weights of the second battery to the Nth battery, the constant pressure borne by the second battery and the constant pressure borne by the third battery … … are sequentially reduced relative to the first battery, and the constant pressure borne by the Nth battery is the weight of the Nth movable plate assembly;
step S200: sequentially connecting the first battery to the Nth battery in series to lead out a total positive end and a total negative end;
step S300: circularly charging and discharging the first battery to the Nth battery through the total positive terminal and the total negative terminal in the step S200;
step S400: the first battery to the Nth battery expand in the process of charge-discharge circulation, and at the moment, a first displacement reader to an Nth displacement reader which are correspondingly connected with the first movable pressing plate to the Nth movable pressing plate read a first expansion amount to an Nth expansion amount respectively, wherein N is a positive integer, and N is more than or equal to 2 and less than or equal to 10; further, N ═ 6 is preferable.
The invention has the beneficial effects that:
1. the invention firstly fixes the movable pressing plates on the base vertically through the guide rod, and the movable pressing plates are arranged along the guide rod in a sliding way up and down, so that the movable pressing plates and the base form a vertical parallel relation; moreover, batteries are clamped between the base and the first movable pressing plate and between every two adjacent movable pressing plates, so that the number of the movable pressing plate assemblies and the number of the batteries are the same, the batteries are arranged in a stacked mode, the constant pressure borne by each interlayer battery is the sum of the weight of the movable pressing plate assemblies and the weight of the batteries on all the interlayer batteries, the pressure borne by the battery on the base at the bottommost layer is the maximum, the pressure borne by the battery at the top layer is the minimum, and different constant pressures are exerted on the batteries in different interlayers; then, the expansion amount of each interlayer battery in the charging and discharging circulation process is obtained through a plurality of displacement readers, and through the design of the weight combination of the movable pressing plate assembly, the beneficial effect of simultaneously testing the expansion amounts of a plurality of interlayer batteries under different pressures is achieved.
2. According to the invention, different constant pressures are applied to the batteries with different interlayers by the weight combination of the movable pressing plate assemblies with the same and/or different weights, the expansion amount of the same batch of batteries under different pressures can be observed simultaneously, the optimal constant pressure value of the batch of batteries can be obtained rapidly, the efficiency is high, the operability is strong, and important data are provided for the development and design of the batteries and the cycle service life of the batteries.
3. The inner diameter of the guide shaft sleeve arranged on the movable pressing plate is matched with the outer diameter of the guide rod, so that the movable pressing plates can flexibly slide up and down, the friction between the movable pressing plates is reduced, and the expansion amount of a plurality of interlayer batteries can be tested simultaneously.
4. Through the series connection among the interlayer batteries, the test current of each battery can be ensured to be uniform, the test accuracy of the expansion amount under different pressures in the circulating charge-discharge process is further ensured, only one charge-discharge test device needs to be connected, and only one charge-discharge test device channel is occupied for simultaneously testing a plurality of batteries, so that the beneficial effects of simple structure, convenience in operation and resource cost saving are further realized.
5. The displacement reader arranged on each movable pressing plate measures the relative displacement variation of every two adjacent movable pressing plates, so that the thickness variation (namely the expansion amount of the battery) of the battery in the charge-discharge cycle process is accurately measured.
6. The movable pressing plate is convenient to install and use through the holding part arranged on the movable pressing plate, and the beneficial effect of the invention on convenience in operation is further enhanced.
Drawings
The following drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, and are included solely for purposes of illustration and description and are not intended to limit the scope of the invention. In the drawings:
fig. 1 is a schematic structural diagram of an apparatus for testing swelling of a plurality of batteries under different pressures according to one embodiment of the present application;
FIG. 2 is a schematic front view of an apparatus for testing swelling of a plurality of batteries under different pressures according to a second embodiment of the present application;
fig. 3 is a flowchart of a method for testing swelling of multiple batteries under different pressures according to a third embodiment of the present application.
Reference numerals:
10. a base; 11. a stent holder; 20. a guide bar; 21. a first movable platen; 22. a second movable platen; 23. a third movable platen; 24. a fourth movable platen; 25. a fifth movable pressing plate; 26. a sixth movable platen; 2N, an Nth movable pressing plate; 2(N-1) th and N-1 th movable pressing plates; 200. a holding part; 30. a displacement reader; 31. a magnetic stripe cylinder; 40. and (4) conducting wires.
Detailed Description
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
It should be noted that, unless the directions indicated are individually defined, the directions of up, down, left, right, horizontal, vertical, etc. referred to herein are based on the directions of up, down, left, right, horizontal, vertical, etc. shown in fig. 1 of the embodiment of the present application, and if the specific posture is changed, the directional indication is changed accordingly. The terms "plurality," "plurality," and the like, when used in this specification, are intended to mean two or more, and they are not intended to imply any order, quantity, or importance, but rather are used to distinguish one element from another. Further, in the various embodiments of the present disclosure, the same or similar reference numerals denote the same or similar components.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part, unless otherwise expressly stated or limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the scope of the present invention as claimed.
Example one
Referring to fig. 1 to 2, the apparatus for testing expansion of a plurality of batteries under different pressures in the present embodiment includes a base 10, a rack holder 11, a testing space formed between the rack holder 11 and the base 10, and the present embodiment includes, but is not limited to, four guide rods 20 vertically fixed on the base; the device also comprises a plurality of movable pressing plate components, each movable pressing plate component comprises a movable pressing plate and a displacement reader 30 arranged on the movable pressing plate, and each movable pressing plate slides up and down along the guide rod 20 to be parallel to the base.
By using the technical scheme of the embodiment, batteries are clamped between the base 10 and the first movable pressing plate 21 and between every two adjacent movable pressing plates in the embodiment to form a plurality of sandwich batteries, and the constant pressure applied to each sandwich battery is equal to the weight combination above the sandwich battery, so that the pressure applied to the battery on the base at the bottommost layer is the largest, the pressure applied to the battery on the top layer is the smallest, and different constant pressures are applied to the batteries of different sandwich layers; and moreover, the swelling capacity of the batteries of each interlayer in the charge-discharge cycle process is obtained through a plurality of displacement readers, the optimal constant pressure value of the batch of batteries is screened out, the cycle life data of the batteries under different constant pressures can be further obtained, and high-efficiency and high-precision test data are provided for the development and design of the batteries and the cycle service life of the batteries. Thereby realized the beneficial effect of the swelling volume of a plurality of intermediate layer batteries of simultaneous test under different pressure, had that efficiency of software testing is high, the precision is high, with low costs, the practicality is strong, advantages such as easy operation, and then solved and had that the operation is complicated, the implementation degree of difficulty is high, the cost is higher among the prior art, the problem that efficiency of software testing is low, the precision is low.
It should be noted that, each interlayer battery in this embodiment is preferably, but not limited to, a single battery cell, and may also be a battery cell module. Through utmost point ear clamp and wire 40 with a plurality of intermediate layer batteries series connection, guarantee that the test current of each battery is unified, further ensure the measurement accuracy nature of the inflation volume under the different pressures of circulation charge-discharge in-process, and only need connect a charge-discharge test equipment can, only occupy a charge-discharge test equipment passageway to a plurality of batteries of test simultaneously, further realized that this embodiment has simple structure, convenient operation, resources are saved cost and the high beneficial effect of test accuracy.
In this embodiment, the displacement readers 30 each read the amount of expansion of the underlying sandwich battery during the charge-discharge cycle, and specifically, the amount of expansion of the sandwich battery immediately below the displacement reader is read by each displacement reader. Furthermore, the displacement readers 30 mounted on each movable platen are preferably, but not limited to, magnetic grid scales, grating scales, or laser rangefinders; referring to fig. 1, the displacement reader 30 slides along the magnetic stripe disposed on the magnetic stripe cylinder 31, reads the relative displacement data, and transmits the relative displacement data to the software corresponding to the computer, so as to accurately measure the thickness change (i.e., the expansion amount of the battery) of each interlayer battery in the charge-discharge cycle process, thereby further ensuring that the present invention has the advantage of high measurement precision.
Example two
The present embodiment is different from the first embodiment in that the weight combination in the first embodiment is the sum of the weights of the plurality of movable platen assemblies above the sandwiched battery and the sum of the weights of the plurality of batteries above the sandwiched battery; referring to fig. 2, the present embodiment includes N movable platen assemblies, each including a first movable platen 21, a second movable platen 22, a third movable platen 23 … …, an nth-1 movable platen 2N-1, an nth movable platen 2N, and a displacement reader 30 respectively mounted on each movable platen. The weights of the movable pressure plate assemblies in the embodiment are respectively M1, M2 and M3 … … Mn, and the data of the weights may be the same or different and are set according to actual conditions; the weight of each interlayer battery is S, the weight of the batteries in the same batch is generally the same, the device can be used for the batteries in different batches and different weights, and the advantages of wide application range and strong practicability of the testing device are further embodied; because the number of the sandwich batteries is the same as that of the movable pressing plate assemblies, and the sandwich batteries and the movable pressing plate assemblies are arranged in a laminated manner, the pressure F1 borne by the first sandwich battery on the base at the bottommost layer is the maximum constant pressure value, and F1 is M1+ M2+ M3+ M4 … … + Mn + S (n-1); the pressure F2 applied to the second sandwich battery sequentially upward is: f2 ═ M2+ M3+ M4 … … + Mn + S (n-2); the pressure F3 applied to the third sandwich cell is: the pressure Fn applied to the nth cell on the top layer of the F3-M3 + M4 … … + Mn + S (N-3) … … is the minimum constant pressure value, and the Fn-Mn.
Therefore, F1, F2, F3, … … Fn-1 and Fn are shown, in the embodiment, the constant pressure on the batteries with different interlayers is different through the combination of the movable pressing plates, the charging and discharging test equipment performs charging and discharging circulation on the series battery pack, the variation situation of the relative displacement between the adjacent movable pressing plates is tested through the displacement reader 30, the expansion amount of each interlayer battery under different constant pressures is further obtained, the optimal constant pressure value of the batch of batteries is screened out according to different expansion amount values under different constant pressures, the cycle life data of the batteries under different constant pressures can be further obtained, and high-efficiency and high-precision test data are provided for the development and design of the batteries and the cycle service life of the batteries.
EXAMPLE III
In this embodiment, on the basis of the second embodiment, as a preferred specific implementation manner, as shown in fig. 1, the number of the movable platen assemblies in this embodiment is preferably, but not limited to, six, and each of the movable platen assemblies includes a first movable platen 21, a second movable platen 22, a third movable platen 23, a fourth movable platen 24, a fifth movable platen 25, and a sixth movable platen 26, and a displacement reader 30 mounted on each movable platen. In this embodiment, the weights of the first movable platen assembly to the fifth movable platen assembly are all 24kg, the weight of the sixth movable platen assembly is 25kg, and the weight of each sandwiched battery is 1 kg. F1-150 kg, F2-125 kg, F3-100 kg, F4-75 kg, F5-50 kg, F6-25 kg, the constant pressures to which the first to sixth cells are subjected are respectively: 150kg,125kg,100kg, 75kg,50kg,25 kg; the positive and negative electrodes of each layer of batteries are arranged on a movable pressing plate in a crossed mode, the batteries are sequentially connected in series through a lead 40, a total positive end and a total negative end which are led out through series connection are connected to a charge and discharge testing device to perform charge and discharge circulation, the expansion amount of each interlayer battery under the action of constant pressure is measured, the expansion amount value of each interlayer battery is tested through a displacement reader 30, the optimal constant pressure value of the batch of batteries is screened out, the cycle life data of the batteries under different constant pressures can be further obtained, and high-efficiency and high-precision testing data are provided for the development and design of the batteries and the cycle service life of the batteries.
Example four
As shown in fig. 3, the present embodiment provides a method for testing swelling amounts of a plurality of batteries under different pressures, which uses the device for testing swelling amounts of a plurality of batteries under different pressures in the first, second, and third embodiments, and specifically includes the following steps:
step S10: respectively clamping a plurality of batteries between the base and the first movable pressing plate and between every two adjacent movable pressing plates, wherein the constant pressure applied to each interlayer battery is equal to the weight combination above the interlayer battery;
step S20: connecting a plurality of batteries in series in sequence;
step S30: charging and discharging a plurality of batteries;
step S40: and respectively obtaining the expansion amount of the plurality of batteries in the charge and discharge cycle process through a plurality of displacement readers.
As a preferred implementation, the sum of the weights of the several movable platen assemblies above the sandwiched battery in this embodiment plus the sum of the weights of the several batteries above the sandwiched battery results in the weight combination in step S10.
Specifically, referring to fig. 2, the first step of this embodiment is: firstly, a first battery is placed on the base 10, and the first movable pressing plate component 21 is installed on the guide rod 20 and is abutted against the first battery in a downward sliding mode; next, a second cell is placed on the first movable platen assembly 21, then the second movable platen assembly 22 is pressed on the second cell, and sequentially arranged in a stack, and finally the nth movable platen assembly is pressed on the nth cell. The weights of the movable pressure plate assemblies in the embodiment are respectively M1, M2 and M3 … … Mn, and the data of the weights may be the same or different and are set according to actual conditions; the weight of each interlayer battery is S, the weight of the batteries in the same batch is generally the same, the device can be used for the batteries in different batches and different weights, and the advantages of wide application range and strong practicability of the testing device are further embodied; because the number of the sandwich cells is the same as that of the movable pressing plate assemblies, and the sandwich cells and the movable pressing plate assemblies are arranged in a laminated manner, the pressure F1 applied to the first sandwich cell on the base at the bottommost layer is the maximum constant pressure value, and F1 is M1+ M2+ M3+ M4 … … + Mn + S (n-1); the pressure F2 applied to the second sandwich battery sequentially upward is: f2 ═ M2+ M3+ M4 … … + Mn + S (n-2); the pressure F3 applied to the third sandwich cell is: f3 ═ M3+ M4 … … + Mn + S (n-3); the pressure Fn of the Nth cell on the top layer is the minimum constant pressure value, and Fn is equal to Mn.
The second step of this embodiment: the first battery and the second battery … … are sequentially connected in series through the lead 40, and the led total positive end and the led total negative end can ensure the uniformity of the test current of each battery, so that the test accuracy of the expansion amount under different pressures in the cyclic charge-discharge process is further ensured.
The third step of this embodiment: the total positive terminal and the total negative terminal which are led out through the series connection are connected to the charge and discharge test equipment for circulating charge and discharge, only one charge and discharge test equipment needs to be connected, only one charge and discharge test equipment channel is occupied for simultaneously testing a plurality of batteries, and the beneficial effects that the structure is simple, the operation is convenient, the resource saving cost is high, and the test precision is high are further realized.
The fourth step of this embodiment: the displacement reader 30 is used for testing the variation of the relative displacement between the adjacent movable press plates, so as to obtain the expansion amount of each interlayer battery under different constant pressures,
in summary, according to the invention, through the weight combination of each movable pressing plate assembly, the constant pressure applied to each interlayer battery is equal to the weight combination above the interlayer battery, the constant pressures applied to different interlayer batteries are different, and different expansion values of the batteries are measured under different constant pressures, so that the optimal constant pressure value of the batch of batteries is screened out, the cycle life data of the batteries under different constant pressures can be further obtained, and high-efficiency and high-precision test data are provided for the development and design of the batteries and the cycle service life of the batteries. Therefore, the expansion amount of the multiple interlayer batteries can be tested at different constant pressures, and the device has the advantages of high testing efficiency, high precision, low cost, strong practicability, simplicity in operation and the like, and further solves the problems of complex operation, high implementation difficulty, high cost, low testing efficiency and low precision in the prior art.
The foregoing description shows and describes preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, and is not to be construed as excluding other embodiments, but is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the invention as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (10)
1. An apparatus for testing expansion of a plurality of batteries under different pressures, comprising a base, a rack holder, a test space formed between the rack holder and the base, and further comprising:
the guide rods are vertically fixed on the base;
the movable pressing plate assemblies comprise movable pressing plates and displacement readers arranged on the movable pressing plates, the movable pressing plates slide up and down along the guide rods, and interlayer batteries are clamped between the base and the first movable pressing plate and between two adjacent movable pressing plates;
the interlayer batteries in each interlayer are connected in series, the interlayer batteries in different interlayers have different constant pressures, the constant pressure applied to each interlayer battery is equal to the weight combination above the interlayer battery, and the displacement reader reads the expansion amount of the interlayer battery below the interlayer battery in the charge-discharge cycle process.
2. The device for testing the swelling of a plurality of cells under different pressures according to claim 1, wherein the weight combination above a certain sandwiched cell is the sum of the weight of all the movable platen assemblies above the sandwiched cell and the weight of all the sandwiched cells.
3. The device for testing the swelling capacity of a plurality of batteries under different pressures according to claim 1, wherein the weight of any two movable platen assemblies in the movable platen assemblies can be the same or different.
4. The device for testing the expansion amount of a plurality of batteries under different pressures according to claim 1, wherein the movable pressing plate is provided with a through hole, the through hole is provided with a guide shaft sleeve which is beneficial to the movable pressing plate to slide up and down, and the inner diameter of the guide shaft sleeve is matched with the outer diameter of the guide rod.
5. The device for testing the swelling capacity of the multiple batteries under different pressures according to claim 1, wherein a first battery is arranged between the base and the first movable pressing plate, an Nth battery is arranged between the N-1 th movable pressing plate and the Nth movable pressing plate, and the first battery to the Nth battery are sequentially connected in series, wherein N is a positive integer, and N is more than or equal to 2 and less than or equal to 10.
6. The device for testing the swelling capacity of a plurality of batteries under different pressures according to claim 5, wherein the number of the movable platen assemblies is six.
7. The device for testing the expansion amount of a plurality of batteries under different pressures according to claim 1, wherein a magnetic cylinder is fixedly connected to the base, and a magnetic strip is arranged on the side surface of the magnetic cylinder close to the displacement reader.
8. The device for testing the expansion amount of a plurality of batteries under different pressures according to claim 1, wherein the movable pressing plate is provided with a holding part.
9. A method for testing the swelling of a plurality of cells under different pressures, wherein the method uses the device for testing the swelling of a plurality of cells under different pressures according to any one of claims 1 to 8, the method comprising the steps of:
step S10: clamping each interlayer battery between the base and the first movable pressing plate and between two adjacent movable pressing plates respectively, wherein the constant pressure applied to each interlayer battery is equal to the weight combination above the interlayer battery;
step S20: connecting all the interlayer batteries in series in sequence;
step S30: carrying out cyclic charge and discharge on the battery;
step S40: during the charge-discharge cycle, the displacement reader reads the amount of swelling of the underlying sandwich battery.
10. The battery swell-amount testing method of claim 9, wherein the sum of the weight of all movable platen assemblies above a certain sandwiched battery and the weight of all sandwiched batteries yields the weight combination of the sandwiched battery in said step S10.
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