CN110376532B - Battery data measuring method of battery element under compression state - Google Patents
Battery data measuring method of battery element under compression state Download PDFInfo
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- CN110376532B CN110376532B CN201910560120.XA CN201910560120A CN110376532B CN 110376532 B CN110376532 B CN 110376532B CN 201910560120 A CN201910560120 A CN 201910560120A CN 110376532 B CN110376532 B CN 110376532B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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Abstract
The application relates to a method for measuring battery data of a battery element in a compressed state, which is characterized in that an elastic element and the battery element are combined to form a battery device, the battery data of the battery element under the influence of the compressed force is obtained, and the measurement of the battery data of the battery element of the battery device in the compressed state is realized. The characteristic that the elastic element can generate different compression displacements when bearing different pressing forces is utilized, so that the pressing force is controlled and adjusted, the operation is simple, a force sensor is not required to be added to a hardware structure, and the cost is saved.
Description
Technical Field
The application relates to the technical field of lithium ion batteries, in particular to a battery data measuring method of a battery element in a compression state.
Background
For a lithium ion battery for a vehicle, in the manufacturing process of a lithium ion battery device, when a pole piece is superposed or wound into a lithium ion battery monomer, pressure is applied to the pole piece; when the lithium ion battery monomers form the lithium ion battery module, pressure is applied to the lithium ion battery monomers, and the force is called pressing force. The performance of a lithium ion battery is greatly affected by the compressive force. The pressing force is not only related to the attenuation mechanism of the lithium ion battery, but also influences the quick charge strategy of the lithium ion battery. However, the specific mechanism of the impact of the pressing force on the performance of the lithium ion battery pole piece, the single body and the module is not well disclosed. Therefore, the research aiming at the pressing force is popular in the research field of the lithium ion battery at present.
In order to measure the battery data of the battery element in a compressed state, different pressing forces need to be applied to the battery device. However, in the conventional scheme, by designing a plurality of experiment benches, a large number of force sensors are used for measuring and controlling the pressing force applied in the battery equipment, and the cost is high. It is therefore desirable to provide a method that is low cost, simple to operate, and capable of accurately controlling the amount of compressive force applied to the battery device.
Disclosure of Invention
Based on this, it is necessary to provide a battery data measuring method of a battery element in a pressed state, which addresses the problem of the conventional solution that the cost is high when measuring and controlling the pressing force applied in the battery device.
The application provides a battery data measurement method of battery element under the state of being in compression, battery equipment includes elastic element and battery element, battery element is button cell, battery sheet, battery monomer and battery module in one, battery data measurement method includes:
determining the size of the elastic element according to the pressing force requirement borne by the battery element;
combining the elastic element and the battery element to form the battery equipment, applying pressing force to the battery equipment, and acquiring battery data of the battery equipment in a pressing state; and controlling the magnitude of the pressing force applied to the battery equipment according to the relationship between the compression displacement generated by the elastic element and the numerical value of the pressing force borne by the elastic element.
The application relates to a method for measuring battery data of a battery element in a compressed state, which is characterized in that an elastic element and the battery element are combined to form a battery device, the battery data of the battery element under the influence of the compressed force is obtained, and the measurement of the battery data of the battery element of the battery device in the compressed state is realized. The characteristic that the elastic element can generate different compression displacements when bearing different pressing forces is utilized, so that the pressing force is controlled and adjusted, the operation is simple, a force sensor is not required to be added to a hardware structure, and the cost is saved.
Drawings
Fig. 1 is a schematic flowchart of a method for measuring battery data of a battery element in a compressed state according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a battery device loaded with a linear spring and a battery cell in a method for measuring battery data of a battery element in a compressed state according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a disc spring in a method for measuring battery data of a battery device under a compression state according to an embodiment of the present disclosure;
fig. 4 is a second data chart of the method for measuring battery data of a battery element under a compression state according to an embodiment of the present application, where the battery element is a battery cell and the elastic element is a disc spring;
fig. 5 is a schematic structural diagram of a battery device loaded with a disc spring and a battery cell in a method for measuring battery data of a battery element in a compressed state according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a battery device loaded with a disc spring and a button cell in a method for measuring battery data of a battery element under compression according to an embodiment of the present application;
fig. 7 is a first data chart of a method for measuring battery data of a battery element under compression according to an embodiment of the present application, where the battery element is a button cell battery and the elastic element is a disc spring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The application provides a method for measuring battery data of a battery element in a compressed state. It should be noted that, the battery data measuring method of the battery element in the compressed state mentioned in all the embodiments in the present application is not limited to the application field and the application scenario thereof. Optionally, the method for measuring battery data of the battery element in the compressed state is applied to a lithium ion battery device.
The battery device in the battery data measuring method of the battery element in the compressed state is composed of an elastic element and the battery element. The battery element is not limited to a specific form thereof. The battery element can be one of a lithium ion button cell, a lithium ion battery pole piece, a lithium ion battery monomer and a lithium ion battery module. In the battery device, the force-bearing surface of the elastic member and the force-bearing surface of the battery element are parallel. When the battery device is in a compressed state, the elastic member and the battery member are simultaneously pressed by the pressing force. In other words, the elastic element is subjected to a pressing force of a value equal to the pressing force of the battery element.
As shown in fig. 1, in an embodiment of the present application, the method for measuring battery data of a battery element in a compressed state includes:
and S100, determining the size of the elastic element according to the pressing force requirement borne by the battery element.
In particular, the pressing force requirements to which the battery element is subjected are determined by the laboratory staff. The step S100 is a design step of the elastic element. For different pressing force requirements, the dimensions of the spring element are correspondingly different. The elastic element is an element with a known compression displacement-pressing force relationship. That is, when the pressing force is applied to the elastic element, the pressing force applied to the elastic element changes along with the change of the compression displacement generated by the elastic element, and the change rule of the pressing force is known. The elastic element can be a spiral spring, a disc spring, a rubber column or any other elastic mechanism with an elastic deformation rule.
S300, combining the elastic element and the battery element to form the battery equipment, applying pressing force to the battery equipment, and acquiring battery data of the battery element under the influence of the pressing force. And controlling the magnitude of the pressing force applied to the battery equipment according to the relationship between the compression displacement generated by the elastic element and the numerical value of the pressing force borne by the elastic element.
Specifically, the experimenter can obtain the pressing force change condition borne by the battery element by the pressing force change condition borne by the elastic element, so that the experimenter can conveniently monitor the battery data of the battery element in a pressing state. The battery data may be one or more of a state of charge value of the battery element, a battery capacity of the battery element, a durability of the battery element, and an impedance of the battery element, but is not limited to the above battery data.
In this embodiment, the battery device is formed by combining the elastic element and the battery element, and the battery data of the battery element under the influence of the pressing force is acquired, so that the measurement of the battery data of the battery element in a pressed state of the battery device is realized. The characteristic that the elastic element can generate different compression displacements when bearing different pressing forces is utilized, so that the pressing force is controlled and adjusted, the operation is simple, a force sensor is not required to be added to a hardware structure, and the cost is saved.
In an embodiment of the present application, the step S100 includes the following steps S110 to S120:
and S110, determining the pressing force requirement borne by the battery element, and determining the size range of the elastic element according to the pressing force requirement borne by the battery element, wherein the pressing force requirement borne by the battery element is smaller than the allowable load of the elastic element.
In particular, the pressing force requirements to which the battery element is subjected are determined by the laboratory staff. The size of the elastic element is not limited, and the size of the elastic element can meet the pressing force requirement borne by the battery element. Thus, the size of the elastic element may exhibit a range.
The allowable load of the elastic element is the maximum pressing force that the elastic element can bear. The pressing force to which the elastic element is subjected needs to be less than the allowable load of the elastic element. If the pressing force applied to the elastic element is greater than the allowable load of the elastic element, the elastic element may be damaged. I.e. the elastic element will lose its ability to undergo a compressive displacement when subjected to a pressing force. It will be appreciated that the cell element is subjected to a compressive force requirement which is less than the allowable load of the resilient element. Optionally, the allowable load of the elastic element is 1.5 times the pressing force requirement borne by the battery element.
This step ensures that the elastic member can effectively generate a compression displacement when it bears the pressing force by setting the pressing force requirement borne by the battery member to be smaller than the allowable load of the elastic member. Further, the validity of the acquired battery data is ensured.
S120, selecting the size of the elastic element within the size range of the elastic element.
In particular, the selection principle of the dimensions of the elastic element is not limited either. Alternatively, the size of the resilient element may be randomly selected within the range of sizes of the resilient element.
In the embodiment, by defining the size range of the elastic element, a stable boundary condition is given to the relationship between the compression displacement generated by the elastic element and the pressing force value born by the elastic element in the subsequent acquisition.
In an embodiment of the present application, before the step S300, the method further includes:
s210, placing the elastic element into a pressure testing device, applying pressing force to the elastic element, and recording the numerical value of the pressing force borne by the elastic element under different compression displacements.
Specifically, the pressure testing device may be any device that performs a compression test on the elastic element and can accurately acquire the compression displacement generated by the elastic element and the pressing force value borne by the elastic element. Alternatively, the pressure testing device may be a universal testing machine.
S220, generating a first data chart according to the relation between the compression displacement generated by the elastic element and the pressing force value born by the elastic element.
Specifically, the first data table may be a data table, or may be a line graph. Optionally, the first data chart is a line graph drawn based on a plane rectangular coordinate system. The abscissa of the first data chart is the compression displacement generated by the elastic element. The ordinate of the first data diagram is the value of the pressing force to which the elastic element is subjected. That is, the first data graph may be a compression displacement-pressing force line graph. Different elastic elements have different compression displacement-pressing force line graphs. The shape of the curve in the compression displacement-pressing force line graph is related to the nature of the elastic element itself.
In the embodiment, the relation between the compression displacement generated by the elastic element and the borne pressing force can be obtained by actually applying the pressing force to the elastic element through the pressure testing device, and a data basis is visually provided for the subsequent control and adjustment of the pressing force applied to the battery equipment.
The elastic elements are mainly divided into two types, and therefore the following is mainly explained into two embodiments.
Example 1:
in the embodiment 1, when the elastic element is subjected to the pressing force, the value of the pressing force applied to the elastic element is continuously changed along with the change of the compression displacement generated by the elastic element.
Specifically, the type of the elastic element used in example 1 is shown in the first data table, and the compression displacement-pressing force line is a curve having a constant trend, taking the first data table as a compression displacement-pressing force line graph as an example.
In this embodiment, by selecting the elastic element whose pressing force value continuously changes with the change of the compression displacement, it is possible to measure the battery data of the battery element in a scene where the force is not constant by using the relationship between the pressing force of the elastic element and the compression displacement.
Alternatively, the resilient element may be a linear spring.
In particular, linear springs are common and inexpensive. The linear spring is selected as the elastic element, so that the cost of the battery data measuring method of the battery element in a compressed state can be effectively reduced.
In this embodiment, the linear spring is selected as the elastic element, so that the cost can be effectively reduced, and the purpose of measuring the battery data of the battery element in a scene with inconstant force can be achieved.
In an embodiment, the step S110 includes:
s111, determining the size range of the elastic element according to the formula 1 and the allowable load of the elastic element, wherein the size of the elastic element comprises the wire diameter of the linear spring, the effective number of turns of the linear spring and the central diameter of the linear spring:
wherein G is the shear modulus of elasticity of the linear spring. d is the wire diameter of the linear spring. n is the effective number of turns of the linear spring. D is the center diameter of the linear spring. k is the stiffness coefficient of the linear spring. x is a preset compression displacement of the linear spring. And F is the pressing force borne by the elastic element. x is the number ofmaxIs the original length of the elastic element. FmaxIs the allowable load of the elastic element.
Specifically, the size of the elastic member may not be limited to a specific value as long as it is satisfied that the pressing force to which the elastic member is subjected is smaller than the allowable load of the elastic member. In this embodiment, the elastic element is a linear spring, and therefore, the specific numerical size of the dimension of the elastic element is constrained by using the stiffness coefficient formula (i.e., formula 1) of the linear spring.
In equation 1, the pressing force F experienced by the elastic member is a known amount, equal to the pressing force requirement experienced by the battery member. The preset compression displacement x of the linear spring is also a known quantity, preselected by the experimenter. Alternatively, x may be the original length x of the elastic elementmax20% to 40%. In the embodiment, the size range of the elastic element is defined by using the stiffness coefficient formula of the linear spring and the maximum pressing force which can be borne by the elastic element, the calculation is simple and convenient, and the data reliability is high.
In this embodiment, the step S300 is a process of acquiring battery data of the battery element in a pressed state by applying a pressing force to the battery device. Optionally, there may be two application scenarios in embodiment 1, one is a laboratory application scenario, and the other is a vehicle actual application scenario. The following are described separately.
Example 1.1 (laboratory application scenario):
in embodiment 1.1, the step S300 may include the following steps S311 to S317:
s311, combining the elastic member and the battery element to form the battery device.
Specifically, fig. 2 is a schematic structural view of an embodiment of the battery device in this embodiment, in which the elastic member and the battery element are loaded. The battery device includes a first steel plate 310 and a second steel plate 320 disposed parallel to each other. Between the first steel plate 310 and the second steel plate 320, the battery element 200 is disposed. The battery element 200 is in contact with the second surface 312 of the first steel plate 310 and the first surface 321 of the second steel plate 320, respectively. An elastic member 100 and a pressing force applying member 400 are provided on a first surface 311 of the first steel plate 310. In this embodiment, the pressing force applying member 400 may be a movably adjustable bolt. The elastic member 100 may be a linear spring. By changing the position of the pressing force applying member 400, the pressing force can be applied to the elastic member 100. Further, the first steel plate 310 may be pressed, applying a pressing force to the battery element 200. The second steel plate 320 serves to support the battery element 200. The battery element 200 in the battery device may be a pouch battery or a square-case battery. When the battery device is assembled, the battery element 200 is interposed between the first steel plate 310 and the second steel plate 320. The elastic member 100 is fixed to the first surface 311 of the first steel plate 310. In the embodiment shown in fig. 2, the battery element is a battery cell, and the elastic element is a linear spring.
And S313, applying initial pressing force to the battery equipment, and placing the battery equipment in a pressing state into a charging and discharging device.
Specifically, the value of the initial pressing force is set by an experimenter. The value of the initial pressing force may be any value smaller than the allowable load of the elastic member.
And S315, performing charging and discharging operation on the battery equipment in the compressed state, and acquiring the compression displacement generated by the elastic element in real time in the charging and discharging process.
Specifically, the compression displacement generated by the elastic element is changed continuously during the charge and discharge process of the battery element in the battery device. For example, the battery element generates a swelling phenomenon. Consequently, the pressing force applied to the battery element is also changed. The pressing force value borne by the battery element can be indirectly obtained through the compression displacement generated by the elastic element.
And S317, searching a pressing force value borne by the elastic element matched with the compression displacement generated by the elastic element in the first data chart so as to determine the pressing force value borne by the battery element.
Specifically, after the compression displacement generated by the elastic element is acquired in real time, a first data chart stored in advance is called, and a pressing force value matched with the compression displacement is searched. The pressing force value is equal to the pressing force value borne by the battery element.
In this embodiment, the battery device is placed in the charge and discharge device, and the compression displacement of the elastic element is detected in real time, so that the pressing force value applied to the battery element can be obtained in real time. This embodiment can be carried out in the laboratory, and the acquirement of packing force is convenient, and acquires with low costsly.
Example 1.2 (vehicle practical application scenario):
in embodiment 1.2, the step S300 may include the following steps S312 to S318:
s312, combining the elastic member and the battery element to form the battery device.
Specifically, the step S312 is the same as the step S311, and is not repeated herein.
And S314, placing the battery equipment into a test vehicle, and putting the test vehicle into use.
Specifically, the kind of the test vehicle may not be limited. Alternatively, the test vehicle may be an electric car.
And S316, acquiring the compression displacement generated by the elastic element in real time in the using process of the test vehicle.
Specifically, a displacement sensor is arranged in the test vehicle. The displacement sensor is connected with the pressing force applying device. In particular, the displacement sensor is connected to an elastic element in the pressing force application device. The displacement sensor can acquire the compression displacement generated by the elastic element in real time.
And S318, searching a pressing force value borne by the elastic element matched with the compression displacement generated by the elastic element in the first data chart so as to determine the pressing force value borne by the battery element.
Specifically, after the compression displacement generated by the elastic element is acquired in real time, a first data chart stored in advance is called, and a pressing force value matched with the compression displacement is searched. The pressing force value is equal to the pressing force value borne by the battery element. The first data chart may be stored in a memory of a control device of the test vehicle. The first data chart may also be stored at the server.
In this embodiment, the battery device is placed in the test vehicle, and the compression displacement generated by the elastic element is detected in real time during the actual operation of the test vehicle, so that the pressing force value applied to the battery element can be acquired in real time. The method can be applied to the actual application scene of the vehicle, has great significance for the research of the pressing force related battery data of the whole vehicle battery, and is simple to operate in the data acquisition process.
Example 2 using a second elastic element is set forth below.
Example 2:
in example 2, the elastic element has a quasi-zero stiffness characteristic when subjected to a compressive force. Namely, during the process of applying the pressing force to the elastic element, a certain compression displacement range exists, so that the compression displacement generated by the elastic element is changed while the value of the pressing force born by the elastic element is kept unchanged.
In particular, the present embodiment is applied to application scenarios where a constant force needs to be applied to the elastic element. A resilient element with quasi-zero stiffness can achieve this. The elastic element with quasi-zero rigidity has a certain compression displacement range in the process of applying pressing force to the elastic element, and the numerical value of the pressing force borne by the elastic element is kept unchanged while the compression displacement generated by the elastic element is changed. This embodiment allows the elastic element to be in a compressed state with a constant value of pressing force. It will be appreciated that this embodiment allows the cell element to be under compression with a constant value of compression force, and its cell data measured.
In this embodiment, by selecting the elastic element with quasi-zero stiffness, the pressing force applied to the elastic element is kept unchanged by virtue of the relationship between the pressing force of the elastic element and the compression displacement in a scene with constant force, and the measurement of the battery data of the battery element in a pressing state with constant value of the pressing force is realized.
In this embodiment, the elastic element may be a disc spring.
In particular, the elastic element may also be another element with quasi-zero stiffness. On one hand, the structure of the disc spring is simple, and the relation between pressing force and compression displacement is convenient to obtain. Fig. 3 is a schematic view of the structure of the elastic member in one embodiment. As shown in fig. 3, the elastic member is a disc spring 100. Belleville spring 100 includes first base 110, first wall 120, second base 130, and second wall 140 connected end to end in that order. On the other hand, the cost of the disc spring is low.
In this embodiment, the disk spring is selected as the elastic element, so that the cost can be effectively reduced, and the purpose of measuring the battery data of the battery element in a scene with constant force can be achieved.
In this embodiment, the step S100 includes:
and S112, determining a preset pressing force value applied to the battery equipment, and taking the preset pressing force value applied to the battery equipment as a pressing force requirement borne by the battery element.
In particular, the pressing force requirement to which the battery element is subjected may be a preset pressing force value of the battery device. The preset pressing force value of the battery equipment is preset by an experimenter. For example, in order to obtain battery data of a battery element under a pressing force of 1MPa, an experimenter may set a preset pressing force value of the battery device to 1 MPa.
And S114, determining the size range of the elastic element according to the formula 2 and a given preset pressing force value applied to the battery device. The preset pressing force value applied to the battery equipment is smaller than the allowable load of the elastic element. The size of the elastic element comprises the diameter of the first bottom surface of the disc spring, the diameter of the second bottom surface of the disc spring, the height of the disc spring and the wall thickness of the disc spring, and the size of the elastic element needs to satisfy the formula 2:
wherein, P is the pressing force value borne by the elastic element. R is the diameter of the first bottom surface of the disc spring. r is the diameter of the second bottom surface of the disc spring. h is the height of the disc spring. And t is the wall thickness of the disc spring. λ is the compression displacement produced by the belleville spring.
Specifically, in this embodiment, the elastic member is a disc spring, and thus a specific numerical value of the size of the elastic member is restricted using a pressing force calculation formula (i.e., formula 2) of the disc spring. This embodiment allows the belleville spring to maintain a constant predetermined amount of compression force over a range of compression displacement.
In equation 2, the pressing force value P applied to the elastic element is a known value and is set by an experimenter. R, R, h and t are unknowns to be sought with respect to the dimensions of the elastic element. The compression displacement lambda generated by the disc spring is determined by debugging of experimenters and belongs to an unknown quantity. Laboratory personnel can set up simulation experiments in the laboratory, through constantly adjusting lambda, can obtain the different combinations of R, R, h and t to confirm the size range of elastic element. The above steps can be accomplished by simulation software.
In the embodiment, the size range of the elastic element is defined through the pressing force calculation formula of the disc spring and the preset pressing force value of the battery device, the calculation is simple and convenient, and the data reliability is high.
In this embodiment, after the step S130, the step S100 further includes a dimension verification process of the elastic element, as follows from the step S140 to the step S190:
s140, calculating the pressing force value born by the elastic element under different compression displacements according to the size of the selected elastic element and the formula 2:
wherein, P is the pressing force value borne by the elastic element. R is the diameter of the first bottom surface of the disc spring. r is the diameter of the second bottom surface of the disc spring. h is the height of the disc spring. And t is the wall thickness of the disc spring. λ is the compression displacement produced by the belleville spring.
Specifically, the elastic element used in this embodiment is a disc spring, and the range of the compression displacement interval of the elastic element when the disc spring bears the pressing force with the constant value of the pressing force can be theoretically calculated by calculating the value of the pressing force borne by the disc spring under different compression displacements.
S150, generating a second data chart according to the relation between the compression displacement generated by the elastic element and the pressing force value born by the elastic element.
Specifically, the second data table may be a data table, or may be a line graph. Alternatively, as shown in fig. 4, the second data chart is a line graph drawn based on a planar rectangular coordinate system. The abscissa of the second data chart is the compression displacement generated by the elastic element. The ordinate of the second data table represents the values of the pressing forces to which the spring element is subjected. The second data table is a theoretical compression displacement-pressing force line graph obtained by theoretical calculation, unlike the first data table. The second data chart is used to design and size the disc spring. The first data chart is an actual compression displacement-pressing force line graph obtained by actually testing through a pressure testing device. The first data chart is used for determining the range of the compression displacement interval of the elastic element when the compression force borne by the disc spring is unchanged.
And S160, acquiring the pressing force platform area in the second data chart. And judging whether the pressing force platform area is qualified or not. The pressing force platform area is an image area in which the pressing force value born by the elastic element is kept unchanged while the compression displacement generated by the elastic element is changed.
Specifically, in the second data table, there is an image area in which the amount of pressing force applied to the elastic member is kept constant while the compressive displacement generated by the elastic member is changed. As shown in fig. 4, the image area is a horizontal line segment with a length of L1.
And S170, if the pressing force platform area is qualified, executing the subsequent step S210.
And S180, if the pressing force platform area is unqualified, returning to the step S100.
Specifically, when the elastic member and the battery device are placed in the pressing force applying apparatus and the pressing force applying apparatus is placed in the electric vehicle, the battery device is deformed and an external disturbance factor is generated. Therefore, it is necessary to ensure that the pressing force plateau area is sufficiently stable. After determining that the pressing force plateau region is qualified, it may be determined that there is no problem with the size of the elastic member (disc spring), and the subsequent step S210 is performed, the elastic member is placed in a pressure testing apparatus, and the subsequent steps are performed.
In this embodiment, a theoretical compression displacement-pressing force line graph is obtained by calculating theoretical data of the elastic element, and the qualification of the area of the pressing force platform in the graph is verified, so that the elastic element can be ensured to apply a constant pressing force to the elastic element in the actual pressing force application process.
Optionally, the second data graph is a line graph. The abscissa of the second data chart is the compression displacement generated by the elastic element. The ordinate of the second data table represents the values of the pressing forces to which the spring element is subjected.
The step S160 includes the following steps S161 to S162:
and S161, judging whether the length of the compression displacement platform line segment in the pressing force platform area is larger than the deformation amount of the battery element. The compression displacement platform line segment is a line segment formed by connecting coordinate points of compression displacement generated by the corresponding elastic elements when the pressing force value born by the elastic elements in the second data chart is kept unchanged.
Specifically, the deformation amount of the battery element is known and is determined by the manufacturing process of the battery element. For example, when the battery element is a battery cell, the deformation amount of the battery element is 0.2 mm. Alternatively, the length of the compressive displacement platform line segment may be 0.5 millimeters.
And S162, if the length of the line segment of the compression displacement platform is greater than the deformation amount of the battery element, determining that the pressing force platform area is qualified.
Specifically, if the length of the compression displacement platform line segment is greater than the deformation amount of the battery element, it is determined that the length of the compression displacement platform line segment can cover the fluctuation caused by the self deformation of the battery element and the external factors.
In this embodiment, by determining whether the length of the segment of the compression displacement platform is greater than the deformation amount of the battery element, an error caused by fluctuation due to the deformation of the battery element and an external factor in the use process of the elastic element can be avoided.
In an embodiment of the present application, the qualified line verification of the pressing force platform (step S160) may also be determined by verifying the level of the line segment of the compression displacement platform. And if the horizontal degree of the line segment of the compression displacement platform is more than 99%, determining that the area of the pressing force platform is qualified.
Similar to embodiment 1, there may be two application scenarios in embodiment 2, one is a laboratory application scenario, and the other is a vehicle actual application scenario. The following are described separately.
Example 2.1 (laboratory application scenario):
in embodiment 2.1, the step S300 includes the following steps S321 to S327:
s321, combining the elastic element and the battery element to form the battery device.
Specifically, when the elastic member is a disc spring, the structure of the battery device may vary depending on the variation of the structure of the battery element. Two different embodiments of battery devices are described below.
In an embodiment of the present application, as shown in fig. 5, the battery element 200 may be a pouch battery or a square-case battery. The elastic element is a disc spring. The battery device may include a first steel plate 310, a second steel plate 320, and a third steel plate 330 disposed parallel to each other. The elastic member 100 may be disposed between the second steel plate 320 and the third steel plate 330. The battery element 200 may be disposed between the first steel plate 310 and the second steel plate 329. A pressing force applying member 400 is provided on the first surface 311 of the first steel plate 310. By changing the position of the pressing force applying member 400, a certain amount of pressing force can be applied to the elastic member 100. The application of a constant value of pressing force is achieved.
In one embodiment of the present application, the battery element 200 is a button cell battery. The elastic element is a disc spring. In this embodiment, the elastic element 100 can be embedded in a button cell to form a battery device. This step can be carried out during the factory production of the button cell. As shown in fig. 6, the battery device may include a negative electrode cover 210, an elastic element 100, a first gasket 220, a negative electrode tab 230, a separator 240, a positive electrode tab 250, a second gasket 260, an insulating ring 270, and a positive electrode cover 280, which are attached to each other from top to bottom.
And S323, acquiring the compression displacement corresponding to the midpoint of the pressing force platform length line segment in the first data chart. And placing the elastic element and the battery equipment into the pressing force applying device, applying a pressing force to the battery equipment, and enabling the elastic element to generate a compression displacement corresponding to the midpoint of the length segment of the pressing force platform in the first data chart.
In particular, in order for the elastic element to be subjected to a constant pressing force without a change in the compression displacement, the pressing force applied should correspond to the compression displacement of the midpoint of the pressing force plateau length.
When the elastic element is a button cell, the first data sheet is shown in fig. 7, and the length of the pressing force platform length segment is L2.
And S325, placing the battery device in the pressing state into a charging and discharging device.
Specifically, the step S325 is similar to the step S313, only different in the type of the elastic member in the battery device. And the pressing force applied by the battery device in the step S325 is a constant pressing force.
And S327, performing charging and discharging operations on the battery equipment in the compressed state, and acquiring performance data of the battery element in real time in the charging and discharging processes.
In particular, since the elastic element has a quasi-zero stiffness characteristic, a constant pressing force can be borne, and an experimenter can test performance data of the battery element under the constant value pressing force. The performance data of the battery element may be a state of charge value of the battery device.
In this embodiment, by placing the battery device in the charge and discharge device, the battery data of the battery device is acquired in a compressed state with a constant pressing force.
Example 2.2 (vehicle practical application scene)
S322, combining the elastic element and the battery element to form the battery device.
Specifically, the step S322 is the same as the step S321, and is not repeated herein.
And S324, acquiring the compression displacement corresponding to the midpoint of the length line segment of the pressing force platform in the first data chart, applying a pressing force to the battery equipment, and enabling the elastic element to generate the compression displacement corresponding to the midpoint of the length line segment of the pressing force platform in the first data chart.
Specifically, the step S324 is the same as the step S323, and is not repeated herein.
S326, placing the battery equipment in the compaction state into a test vehicle, and putting the test vehicle into use.
Specifically, the kind of the test vehicle may not be limited. Alternatively, the test vehicle may be an electric car.
And S328, acquiring the performance data of the battery element in real time in the using process of the test vehicle.
In particular, during the use process of the test vehicle, because the elastic element has the quasi-zero rigidity characteristic, the elastic element can bear constant pressing force, and an experimenter can test the performance data of the battery element under the constant value pressing force. The performance data of the battery element may be a state of charge value of the battery device.
In the embodiment, the elastic element with the quasi-zero rigidity and the battery element are arranged in the battery equipment, and the battery equipment is arranged in the test vehicle, so that the battery data of the battery element can be acquired under the compression state of the constant-value compression force, the cost is low, and the acquisition difficulty is low.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (9)
1. A method for measuring battery data of a battery element in a compressed state, wherein the battery device comprises an elastic element and a battery element, and the battery element is one of a button battery, a battery pole piece, a battery monomer and a battery module, and the method for measuring battery data comprises the following steps:
s100, determining the size of the elastic element according to the pressing force requirement borne by the battery element;
s300, combining the elastic element and the battery element to form the battery equipment, applying pressing force to the battery equipment, and acquiring battery data of the battery element in a pressing state; the magnitude of pressing force applied to the battery equipment is controlled according to the relation between the compression displacement generated by the elastic element and the numerical value of the pressing force borne by the elastic element;
the elastic element has quasi-zero rigidity characteristic; in the process of applying pressing force to the elastic element, within a certain compression displacement range, the compression displacement generated by the elastic element is changed while the value of the pressing force borne by the elastic element is kept unchanged;
wherein the S100 includes:
s110, determining pressing force requirements borne by the battery element, and determining the size range of the elastic element according to the pressing force requirements borne by the battery element, wherein the pressing force requirements borne by the battery element are smaller than allowable loads of the elastic element;
s120, selecting the size of the elastic element in the size range of the elastic element;
wherein the S110 includes:
s112, determining a preset pressing force value applied to the battery equipment, and taking the preset pressing force value applied to the battery equipment as a pressing force requirement borne by the battery element;
s114, determining the size range of the elastic element according to the formula 2 and a given preset pressing force value applied to the battery equipment, wherein the preset pressing force value applied to the battery equipment is smaller than the allowable load of the elastic element;
the elastic element is a disc spring, the size of the elastic element comprises the diameter of a first bottom surface of the disc spring, the diameter of a second bottom surface of the disc spring, the height of the disc spring and the wall thickness of the disc spring, and the size of the elastic element needs to satisfy the formula 2:
wherein P is a pressing force value born by the elastic element, R is the diameter of the first bottom surface of the disc spring, R is the diameter of the second bottom surface of the disc spring, h is the height of the disc spring, t is the wall thickness of the disc spring, lambda is the compression displacement generated by the disc spring, and E represents the elastic modulus of the elastic element.
2. The method according to claim 1, prior to the S300, further comprising:
s210, placing the elastic element into a pressure testing device, and recording the numerical value of pressing force borne by the elastic element under different compression displacements by applying the pressing force to the elastic element;
s220, generating a first data chart according to the relation between the compression displacement generated by the elastic element and the pressing force value born by the elastic element.
3. The method according to claim 2, wherein after the S120, the S100 further comprises:
s140, calculating the pressing force value born by the elastic element under different compression displacements according to the size of the selected elastic element and the formula 2:
s150, generating a second data chart according to the relation between the compression displacement generated by the elastic element and the pressing force value borne by the elastic element;
s160, acquiring a pressing force platform area in the second data chart, and judging whether the pressing force platform area is qualified or not; the pressing force platform area is an image area in which the pressing force value born by the elastic element is kept unchanged while the compression displacement generated by the elastic element is changed;
s170, if the pressing force platform area is qualified, executing the subsequent step S210;
and S180, if the pressing force platform area is unqualified, returning to the S100.
4. The method according to claim 3, wherein the second data table is a line graph, an abscissa of the second data table is a compression displacement generated by the elastic element, and an ordinate of the second data table is a pressing force value applied to the elastic element, and the S160 includes:
s161, determining whether the length of a compression displacement platform line segment in the pressing force platform area is greater than the deformation amount of the battery element, where the compression displacement platform line segment is a line segment formed by connecting coordinate points of compression displacements generated by a plurality of corresponding elastic elements when the pressing force values borne by the elastic elements in the second data chart are kept unchanged;
and S162, if the length of the line segment of the compression displacement platform is greater than the deformation amount of the battery element, determining that the pressing force platform area is qualified.
5. The method of claim 4, wherein the S300 comprises:
s321, combining the elastic member and the battery element to form the battery device;
s323, acquiring compression displacement corresponding to the midpoint of the pressing force platform length line segment in the first data chart, applying pressing force to the battery equipment, and enabling the elastic element to generate compression displacement corresponding to the midpoint of the pressing force platform length line segment in the first data chart;
s325, placing the battery equipment in the compaction state into a charging and discharging device;
and S327, performing charging and discharging operations on the battery equipment in the compressed state, and acquiring performance data of the battery element in real time in the charging and discharging processes.
6. The method of claim 4, wherein the S300 comprises:
s322, combining the elastic member and the battery element to form the battery device;
s324, acquiring compression displacement corresponding to the midpoint of the length line segment of the pressing force platform in the first data chart, applying pressing force to the battery equipment, and enabling the elastic element to generate compression displacement corresponding to the midpoint of the length line segment of the pressing force platform in the first data chart;
s326, placing the battery equipment in the compaction state into a test vehicle, and putting the test vehicle into use;
and S328, acquiring the performance data of the battery element in real time in the using process of the test vehicle.
7. The method of claim 1, wherein the resilient element is an element having a known compressive displacement-compressive force relationship.
8. The method of claim 1, wherein the battery data comprises one or more of a state of charge value of the battery element, a battery capacity of the battery element, a durability of the battery element, and an impedance of the battery element.
9. The method of claim 1, wherein the allowable load of the elastic member is 1.5 times the pressing force requirement to be borne by the battery member.
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| CN112582694B (en) * | 2020-12-10 | 2022-04-19 | 华霆（合肥）动力技术有限公司 | Cell pressure control method, device and system and electronic equipment |
| CN112731152A (en) * | 2020-12-21 | 2021-04-30 | 天津力神电池股份有限公司 | Power battery full-life cycle constant pressure testing tool and method |
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| DE102009028986A1 (en) * | 2009-08-28 | 2011-03-03 | SB LiMotive Company Ltd., Suwon | Method and device for applying pressure to a battery |
| CN202421230U (en) * | 2012-01-20 | 2012-09-05 | 协鑫动力新材料（盐城）有限公司 | Test fixture for button cells |
| CN106532156A (en) * | 2016-12-29 | 2017-03-22 | 北京海博思创科技有限公司 | Expansion measurement apparatus for power battery |
| CN206479621U (en) * | 2016-12-31 | 2017-09-08 | 深圳市配天机器人技术有限公司 | A kind of battery tester |
| CN207798317U (en) * | 2018-01-19 | 2018-08-31 | 中国农业大学 | Automobile-used lithium ion battery pretightning force test fixture |
| CN109000831A (en) * | 2018-04-27 | 2018-12-14 | 北京华特时代电动汽车技术有限公司 | Battery modules internal pressure measurement method and system |
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