[1]
The present invention relates to relates to a device and method for testing an end plate and, more particularly, an apparatus and method for testing an end plate of the pair to be used for the production of the battery module.
[2]
This application claims priority to an application for the Korea Patent Application No. 10-2017-0048064, filed on April 13, 2017, all information disclosed in the specification and drawings of that application is hereby incorporated by reference into this application.
[3]
BACKGROUND
[4]
Recently, a laptop, a video camera, the demand for portable electronic products such as mobile phones and the rapidly growing electric car, high performance batteries, repeated charging and discharging as developed in earnest, such as the energy storage batteries, robots, satellites for possible for being actively conducted research.
[5]
To currently commercialized batteries there is a nickel cadmium battery, a nickel hydrogen battery, a nickel zinc battery, a lithium battery, of which the lithium battery is free and can be charged and discharged, a memory effect compared to the battery hardly occurs in the nickel-based, self-discharge rate is very low and has been highlighted as a high energy density advantages.
[6]
In particular, the battery modules used in electric vehicles and energy storage systems (ESS), includes a plurality of battery cells for the high output and large capacity. In addition, to protect the laminate from such a pair of end plates, a plurality of the box, by supporting a part of the laminated body, the battery cells are stacked in both directions, limited to the laminated body movements as well as the external force that is provided in the battery module.
[7]
On the other hand, the battery cell, can result in swelling (swelling) swelling by the concentration difference of the lithium to be filled in the gas or generated in the cathode therein. Swelling will inevitably lead to external deformation of the battery cell. That is, the battery cell is gradually increased in the thickness by the amount of gas to increase with it in repeated charge and discharge. Thus, the more it progresses a degeneration of the battery cells constituting the laminate, from the laminate not only can increase the load transmitted to the end plate of the pair. In addition, the temperature of the battery cell, charged state, and the open-circuit voltage: the higher the (OCV Open Circuit Voltage), this swelling is intensified.
[8]
In this regard, if the rigidity of the end plate is too low, the end plate by deformation of the cell stack may be damaged easily. Further, when the rigidity of the end plate of the pair is too large, the swelling of the battery cells included in the cell stack is very constrained, there is a risk of the battery cell explosion.
[9]
Detailed Description of the Invention
SUMMARY
[10]
The invention, as conceived in order to solve the above problems, and an object thereof is to the end plate is provided an apparatus and method for testing that have the proper stiffness to to support the laminate of the battery module in both directions.
[11]
It may be understood by the following description of Other objects and advantages of the present invention will be appreciated more clearly by the embodiment of the present invention. Also, the objects and advantages of the invention will be readily appreciated that this can be achieved by the means presented in the claims and combinations thereof.
[12]
Problem solving means
[13]
Various embodiments of the present invention for achieving the abovementioned objects is as follows.
[14]
Test device according to one aspect of the invention is for testing the end plate mounted on the battery module. The test device, a second parameter and a memory unit for storing a third parameter representing the spring rate of the end plate showing the spring constant of the first parameter, the battery cell, which represents the number of battery cells included in the battery module; And on the basis of the first parameter and to generate a one-dimensional model associated with the battery module, and the second parameter and the third parameter, and calculates the first FD curve based on the one-dimensional model, the first FD curve It includes; a first reference data indicating the control unit to store in the memory unit. At this time, the first FD curve, corresponding to the relationship between the deformation amount and load of the end plate due to the number of battery cells indicated by the first parameter.
[15]
In addition, the one-dimensional model is to the number of battery cells in the indicated by the first parameter simulating a structure in which the front and rear of the sequentially stacked cell stack is supported by the end plate.
[16]
Further, the control unit,
[17]

[18]

[19]
By using the equation (1), but calculating the equivalent spring constant of the one-dimensional model,
[20]
Keq is the equivalent spring constant, n is the number of the battery cells, K1 is the spring constant, K2 of the battery cell is a spring constant of the end plate.
[21]
Further, the control unit,
[22]

[23]

[24]
By using the equation (2), but the yield of claim 1 FD curve, F is the load applied to the end plate, Δx c is the amount of deformation of the battery cells, Δx e is an amount of deformation of the end plate.
[25]
In addition, the memory section, it is possible to store an additional second reference data representing a second FD curve. Wherein, the first can be calculated claim 3 FD curve as a parameter, and based on the claim 2 FD curve. In this case, the first 2 FD curve corresponds to the relationship between the amount of deformation and the reaction force of the battery cell, and wherein the 3 FD curve corresponds to the relationship between a deformation amount and a reaction force of the cell stack.
[26]
Further, the control unit, the first FD curve and the second 3 FD calculates the intersection coordinates of the curve and the end of the swelling of a number of battery cells in that the first parameter is inaction on the basis of the coordinates of the intersection point It may determine the amount of deformation and weight of the plate.
[27]
Further, the control unit, when the coordinates of the intersection point is within the predetermined reference range, it is possible to output the first test result signal. The first test result signal, and that the end plate can be used for indicating that pass the prescribed design basis.
[28]
Further, the control unit, when the coordinates of the intersection point is outside the reference range, it is possible to output the second test result signal. The second test result signal, and that the end plate can be used for indicating that fails the prescribed design basis.
[29]
Further, the control unit, when the coordinates of the intersection point is outside the reference range, it is possible to adjust the first parameter.
[30]
Further, the control unit, when the coordinates of the intersection point is outside the reference range, it is possible to adjust the third parameter.
[31]
Effects of the Invention
[32]
According to at least one of the embodiments of the present invention, the battery module without actually produced, the end plate may be a number of determination that have a rigidity to withstand the loads due to swelling of the battery cells included in the layered product .
[33]
Further, according to at least one of the embodiments of the present invention, without actually making a battery module, it is possible to determine the amount of deformation of the end plate due to swelling of the plurality of battery cells included in the laminated body beforehand.
[34]
Not limited to those mentioned above are the effects of the present invention effects, is not mentioned other effects will be understood clearly to those skilled in the art from the description of the claims.
[35]
Brief Description of the Drawings
[36]
Intended to illustrate the following figures attached to the specification are exemplary of the invention, the components which serve to further understand the spirit of the invention and together with the description of which will be described later invention, the details of this invention is described in such figures be construed as limited only is not.
[37]
1 is a view schematically showing the battery module according to an embodiment of the present invention.
[38]
2 is a view schematically showing a cross section of the battery cell taken along the line A-A 'of Figure 1;
[39]
3 is a view schematically showing the configuration of a test apparatus according to an embodiment of the present invention.
[40]
4 is a view schematically showing a cross section of a battery module taken along the line B-B 'of FIG.
[41]
Figure 5 is a schematic representation showing a one-dimensional model which simulates the deformation of the battery module in accordance with one embodiment of the present invention.
[42]
6 is a graph showing a 2 FD curve corresponding to the relationship between the thickness of the deformation amount and a reaction force of a single battery cell in the limit state.
[43]
7 is the cell stack is a graph showing the relationship between the thickness and amount of deformation reaction force.
[44]
8 is a view, the test apparatus according to an embodiment of the present invention relating to the operation of the test end plate.
[45]
9 is a flow chart schematically showing a method for testing the end plate according to another embodiment of the present invention.
[46]
Mode for the Invention
[47]
With reference to the accompanying drawings will be described a preferred embodiment of the present invention; Prior to this, the specification and are should not be construed as limited to the term general and dictionary meanings used in the claims, the inventor accordingly the concept of a term to describe his own invention in the best way It is to be interpreted based on the meanings and concepts corresponding to technical aspects of the present invention on the basis of the principle that can be defined.
[48]
Accordingly, the configuration shown in the examples and figures disclosed herein are in not intended to limit the scope of the present merely nothing but the embodiment most preferred embodiment of the present invention invention, a variety that can be made thereto according to the present application point It should be understood that there are equivalents and modifications.
[49]
Further, when it is determined that a detailed description of known functions and configurations in the following description of the present invention may obscure the subject matter of the present invention, the detailed description thereof will be omitted.
[50]
First and will be used for any one of the terms including an ordinal number such as 2 are, the various components in order to distinguish from the rest and is not used to define the components by such term.
[51]
In full disclosure, that when any part of the "included" some components, which means not to exclude other components not specifically described are the opposite, it may further include other components. In addition, terms such as described in the specification mean units for processing at least one function or operation, which may be implemented as a combination of hardware, software, or hardware and software.
[52]
In addition, throughout the specification, when that any part is "connected" with another part, which if it is "directly connected to", as well as, interposed between the other element or intervening even if it is "indirectly coupled" It includes.
[53]
1 is a view schematically showing a battery module 100 according to one embodiment of the invention.
[54]
Referring to Figure 1, the battery module 100 includes a battery stack body 110 and the case 120. The battery module 100 is mounted on a vehicle such as a hybrid vehicle, it is possible to supply the electrical energy for the drive of an electric motor provided in the vehicle. Of course, the battery module 100 may be mounted on the outside of the energy storage system, a smart phone.
[55]
In Figure 1, H1 axis is assumed to correspond to the longitudinal direction of the battery module 100 in the width direction and the battery cell 111 in the thickness direction, H2 axis battery module 100 in the height direction, H3 axis battery module 100 of the do.
[56]
Cell stack 110 includes a plurality of battery cells (111). In the cell stack 110, a plurality of battery cells 111 are sequentially stacked along the predetermined direction (for example, H1-axis). To this end, the cell stack 110 can optionally further include a cartridge.
[57]
Type of battery cells 111 included in the cell stack 110 is not particularly limited. Battery cells 111 are rechargeable as long, such as lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries are also mubang which would. In addition, the battery cell 111 can be divided into a pouch-shaped, cylindrical, square, etc., depending on the type of packaging material. The battery cell includes a cell stack 110 (111) can be connected to each other electrically in series architecture, parallel architecture, or series and parallel in a mixed structure.
[58]
Each cartridge is coupled to the at least one battery cell 111 to the physical, and provides a structure for stably fixed in the battery cell 111, the cell stack 110. In addition, the cartridge may have outer fastening bolts or the like directly or via the other adjacent cartridges.
[59]
The module housing 120 includes an end plate (121-1, 121-2) of the pair and at least one strap (125). Each end plate 121 and the respective strap 125 may be interlocking over a number of ways (e.g., welding, bolts). Alternatively, the module housing 120 may be manufactured integrally by insert molding or the like method.
[60]
The module case 120 is provided with an empty space therein, and provides a structure for accommodating such a cell stack 110 in the blank space. And, through the open portion of the module case 120 has cell stack 110 may be provided to allow for insertion or substitution.
[61]
In which the cell stack 110 to the module case 120 is accommodated state, one of the pair of end plates (121-1, 121-2), one (121-1) is the first of the cell stack 110 one remaining in contact with a surface 121-2 abuts the second side of the cell stack 110. In this case, the first and second surfaces of the cell stack 110 can be directed to directions opposite to each other. In this way, each of the pair of end plates (121-1, 121-2) is supported by the pressure in both directions of the cell stack 110, the cell stack 110. That is, the second surface of the end plate 121-1 is a cell stack 110, the first surface of the pressure can be toward the second side, the end plate 121-2 of the cell stack 110 it is possible to press toward the first surface.
[62]
2 is a view showing a modification of the battery cell 111 associated with one embodiment of the present invention. Figure 2 shows a cross-section of the battery cell 111 at the time when cutting the cell stack 110 along the line A-A 'of Figure 1;
[63]
2, each battery cell 111 is in a stable state has a first thickness (L1), the threshold condition may have a second thickness (L2). Here, it is possible to sense that the maximum length of the single-battery cells 111 in the stacking direction (i.e., H1 of the shaft 1) of the battery cells 111 is the thickness, cell stack 110 of the.
[64]
In addition, the steady state is, or the expansion of the battery cell 111 by the swelling may represent a very small state. For example, health (SOH: State Of Health), a predetermined range (for example, 80% or more), and the state of charge (SOC: State Of Charge) that is within a predetermined range (for example, less than 70%), the temperature is a predetermined range If I (e. g., less than 30 degrees), it can be said that the battery cell 111 in the steady state.
[65]
Further, the critical state refers to may represent a state in which the battery cell 111 to the maximum expansion by swelling. For example, SOH a predetermined range (for example, less than 80%) and, SOC that is within a predetermined range (for example, 70% or more), the temperature is the predetermined range (for example, 45 degrees), then the battery cell 111, the marginal it can be said in the state. The first thickness (L1) and the second thickness (L1) may be determined in advance through experiment or the like prior to the battery cell 111, a predetermined number.
[66]
Battery cell 111 is gradually approached from the stable state to the limitation state, the central portion of the battery cell 111 gradually ohreumyeo swollen, the maximum deformation amount of the thickness of the battery cell 111 may be equal to L2-L1.
[67]
While the battery cell 111 is in a steady state, the load applied to the end plate 121 by the expansion of the battery cells 111 are ignored or very small as possible. On the other hand, when gradually progress towards this limit state battery cell 111, the load applied to end plate 121 by the expansion of the battery cell 111 is gradually increased as the degree of not more than negligible.
[68]
Therefore, actually the end plate 121 prior to making the end plate 121 is designed by enni built is required to pre-check whether it is possible to properly pressurize the cell stack (110).
[69]
3 is a view schematically showing the configuration of a test apparatus 200 according to one embodiment of the invention.
[70]
3, the test apparatus 200 whether or not of suitable strength for supporting the end plate 121 a cell stack 110 is loaded on the battery module 100 such as that illustrated in Figure 1 provide for a test, it includes an interface unit 210, a memory unit 220 and a controller 230.
[71]
Interface unit 210, the communication connection with the external device such as the user PC, and transmits and receives data with an external device. Interface 210 is an optional arrangement, it is omitted from the test apparatus 200, as needed. Data interface 210 is to receive from the external device may be stored in the memory unit 220.
[72]
Memory unit 220 is configured to store various kinds of software and data relating to the operation to test the end-plate 121. The At least a portion of the total data stored in the memory unit 220 may be provided from an external device via the interface 210. Memory 220 is a flash memory type (flash memory type), hard disk type (hard disk type), SSD-type (Solid State Disk type), SDD type (Silicon Disk Drive type), a multimedia card micro type (multimedia card micro type), RAM (random access memory; RAM), SRAM (static random access memory), ROM (read-only memory; ROM), EEPROM (electrically erasable programmable read-only memory), PROM (programmable read-only memory) of It may include at least one type of storage medium.
[73]
The memory unit 220 stores a first parameter, a second parameter and a third parameter. The first parameter is the number of battery cells 111 to want to include in the cell stack (110). The second parameter is indicative of the spring constant of the single-battery cells 111. The third parameter is indicative of the spring constant of the end plate 121. Memory unit 220 may further store a second reference data, which will be described later, the second reference data represents the second FD curve (force-distance curve). At this time, the second FD curve, corresponding to the relationship between the amount of deformation and the reaction force of the single-battery cells 111 in the limit state.
[74]
Controller 230 on the basis of the data provided from the interface unit 210 and a memory unit manages the transmission and reception of data through the 220 and the communication is possible to connect an interface unit 210, and memory 220, It performs a test operation on the end plate 121. Controller 230 hardware as, ASICs (application specific integrated circuits), DSPs (digital signal processors), DSPDs (digital signal processing devices), PLDs (programmable logic devices), FPGAs (field programmable gate arrays), a microcontroller ( micro-controllers), it can be implemented using a microprocessor (microprocessors), at least one of the electrical units for performing other functions.
[75]
Specifically, the controller 230 generates a one-dimensional model corresponding to the battery module 100 based on the first parameter. About one-dimensional model, will be described in more detail below with reference to Fig.
[76]
In addition, the controller 230 calculates the claim 1 FD curve based on the second parameter, the third parameters and the one-dimensional model. FD first curve, may be to the first parameter corresponds to the number of the deformation amount between the load of the end plate 121 by the battery cells 111 that indicates relationship. That is, in claim 1 FD curve, the cell stack 110, the battery cell 111 swelling under a load of the end plate 121, thereby being transmitted to from body cells penetrating the end plate 121 in accordance with their contained in the may be to some extent defines whether the generation of bending deformation. Controller 230, and is able to store a first reference data indicating the calculated first FD curve in the memory unit 220.
[77]
4 is a view schematically showing a cross section of the battery module 100 taken along the line B-B 'of FIG. With reference to Figure 4, it is possible more easily understood by the deformation of the end plate (121-1, 121-2) due to swelling of the battery cells 111 included in the cell stack 110 shown in FIG.
[78]
If the individual battery cells 111 is to be expanded by the swelling, since the central portion of the battery cell 111 more deformation than the other portion, the end plate 121 of the pair also occurs the most deformed from the central portion . That is, the bending deformation occurs in the center portion of each end plate 121.
[79]
I1 of Figure 4 is associated with a load transmitted to the end plate 121 from the cell stack (110), I2 is associated with a deformation of the end plate 121, according to the I1. Further, FIG. 4 of the W1 denotes a width of the module case 120 for the battery cells 111 included in a battery electrode member that has a stable state, W2 in Figure 4 is the battery cells (111 includes a battery electrode member ) that represents the width of the module case 120 while having a critical state. That is, if the battery cell 111 from reaching the critical state in the steady state, each end plate 121 is Δx e may be varied by as much. The more the number of the battery cells 111 included in the cell stack 110 is increased, will be also increased the difference between W2 and W1, it is obvious to those skilled in the art.
[80]
If, when the rigidity of the end plate 121 is very large, even if the battery cells 111 included in the cell stack 110 to reach the critical state, a change in the overall width of the battery module 100 will be very small, or . That is, over-limit the deformation of the battery cells 111 included in the cell stack 110, thereby may result in a sudden explosion of the battery cells 111.
[81]
In contrast, if the rigidity of the end plate 121 is very small, the end plate 121 can not be sufficiently thick to limit the change in the cell stack (110). That is, when the battery cells 111 included in the cell stack 110 to reach the limit state, and the excessive strain width of the battery module 100, resulting in the battery cells 111 included in the electrode assembly, between it may encounter problems such as the electrical connection being dropped.
[82]
Figure 5 is a schematic representation showing a one-dimensional model which simulates the deformation of the battery module 100 according to one embodiment of the invention.
[83]
The one-dimensional model in the present invention, the front (the first surface in Fig. 1) of the first number of the battery cells 111. The cell stack 110 is sequentially stacked in the parameter representing the back (second side of Fig. 1 ) is to simulate each of the support structures by two end plates (121-1, 121-2).
[84]
The one-dimensional model, the first spring (SC) corresponding to the battery cells 111 in the number of parameters imply that the two springs (SE) corresponding to the pair of end plates (121-1, 121-2) It may have a basic structure in which series connection between. Hereinafter, for convenience of explanation, n of the battery cell 111 are assumed to constitute a cell stack body (110).
[85]
First, (a) of FIG. 5 illustrates a one-dimensional model when the battery cell 111 that has a stable state. In this case, along the axis H1 (see FIG. 1), each spring (SC) has a first base length, each spring (SE) may have a second base length. Further, K1 is the spring constant of the spring (Sc) representing a second parameter, K2 may be a spring constant of the spring (SE) indicating the third parameter.
[86]
Next, in Figure 5 (b) illustrates the one-dimensional model when the battery cell 111 in the cell stack 110 will have a critical state. In this case, the spring (SE) each, while the second is maintained at a default length, the spring (Sc) are respectively claim 1 Δx than base length c will have a length increased by. That is, Δx c may be a thickness difference between the time to have a time limit and the status having a load of each battery cell 111 in a state that does not function in the steady state from the end plate 121. Accordingly, the total amount of deformation of the cell stack 110 includes (n × Δx c are a).
[87]
Then, (c) of Figure 5 is the battery cell 111 are During having a critical state, any one of the end plates 121, the force (F) towards the other end plate 121 in as is applied, each spring (Sc ) illustrates the one-dimensional model of the case where the return to the first base length. That is, the force (F) is, with the cell stack 110 in the same conditions (n × Δx as illustrated in (b) of FIG. 5 c may be the same force as required for compression by).
[88]
On the other hand, when it is series-connected springs and the springs are connected in series to be in the one-dimensional model, the controller 230 may use the following equation (1), calculate the equivalent spring constant of the one-dimensional model.
[89]

[90]

[91]
Keq of equation (1) shows an equivalent spring constant of the one-dimensional model.
[92]
On the other hand, the load (F) in (c) of Fig. 6 may be calculated using the following equation (2).
[93]

[94]

[95]
A deformation amount Δx of the end plate (121) e , can be expressed as Equation (3) from the equation (1) and equation (2).
[96]

[97]

[98]
Controller 230, can calculate the claim 1 FD curve (see Fig. 8) corresponding to the relationship between the deformation amount and load of the end plate 121 from equation 2, and 3.
[99]
6 is a graph showing a 2 FD curve corresponding to the relationship between the thickness of the deformation amount and the reaction force of the single-battery cells 111 in the limit state, Figure 7 is showing the relationship between the thickness of the deformation amount and the reaction force of the cell stack 110 a graph.
[100]
The size of the reaction force of the single-battery cells 111 may be of a single battery cell 111 is equal to the magnitude of load applied to the end plate 121.
[101]
A thickness deformation amount of the x axis is a single battery cell 111 in the graph shown in Figure 6, the single-battery cells 111, because the limit state, and the minimum thickness of the deformation amount is 0 and the maximum value may be an L2-L1. Further, as the reaction force of the y-axis represents the single-battery cells 111 in the graph shown in Figure 6, the thickness of the deformation amount of a single battery cell 111 is the maximum value (F1) when the zero weight the amount of deformation of the single-battery cells 111 0 is when the L2-L1. That is, the expansion of the single-battery cells 111, the thickness deformation amount of 0 that is, the cell stack body 110 stiffness is very high in the end plate 121 for pressing in the two-way single-battery cells 111 of which the critical state It means completely restricted.
[102]
Also, that the reaction force is zero in a single battery cell 111 in the limit state, to a second thickness (L1) one battery cell 111 is so low that rigidity of the end plate 121 from a first thickness (L1) no impact to that expansion also means that do not meet. Here, x axis units are the units of length, such as 'mm', y-axis unit may be a unit of force or weight, such as 'kgf'.
[103]
The claim 2 FD curve (C2) shown in Figure 6, while continuously or discretely increase or decrease the number of load applied to each of the battery cells 111 in a critical state can be obtained by repeating the process of measuring the thickness have.
[104]
The graph of Figure 7 is the 3 FD as shown the curve (C3), a correction on the basis of the claim 2 FD curve in Figure 6 the total number (= n) of the battery cells 111 included in the cell stack 110 It may correspond to the results. That is, when the number of battery cells 111 included in the cell stack 110 is 2 or more, a maximum value of the thickness of the deformation amount of the maximum value (M) having a thickness of the deformation amount of the cell stack 110 is a single battery cell 111 L2 the maximum value (F2) of the reaction force of a large, cell stack 110 than -L1 is evident that greater than the maximum value (see F1, Figure 6) of the reactive force of the single-battery cells 111.
[105]
Controller 230 of claim 3 FD curve shown on the basis of the number of the battery cells 111 included in the second data and the cell stack 110, showing a FD curve (C2) shown in FIG. 6, 7 It may generate the data indicating the (C3). For example, it may be the first parameter when n = a, the x-intercept and y-intercept of claim 2 FD each n multiplying two points F2 and the M line is also the curve of the FD 3 through 7 of the curve shown in Fig.
[106]
On the other hand, in FIG. 6 and FIG claim 2 FD curve (C2) and the 3 FD curve (C3) that are illustrated as having a respective straight line, which is merely illustrative intended, or the like structure and the material of the battery cells 111 2 in accordance with the shape of the FD curve (C2) and the 3 FD curve (C3) is to be understood that vary.
[107]
8 is a view, the test apparatus 200 according to an embodiment of the present invention associated with the operation to test the end-plate 121. The That is, FIG. 8 is referred to in explaining the operation of evaluating whether the genie the rigidity of the appropriate range to the end plate 121 is supporting the cell stack 110 in both directions.
[108]
8, can determine the relationship between the claim 3 FD curve (C3) shown in Figure 7, exemplary of claim 1 FD curve (C1). , No. 1 FD curve (C1) is a load applied to the deformation of the end plate 121 of the one-environment, the end plate 121, showing the relationship between the deformation amount and load of the end plate 121 as described above is a proportional relationship It may have. In addition, the 3 FD curve (C3) is a reaction force of the deformation amount and the cell stack 110 of the to-environment, cell stack 110, representing the relationship between the amount of deformation and the reaction force of the cell stack 110 can have the inverse relationship have.
[109]
Accordingly, it is crossed in, claim 1 and claim 3 FD FD curve curve is any one point (P) as shown in FIG. First applied to the FD curve with claim 3 FD from the point (P) of the curve intersect, cell stack 110, the load of the end plate 121 cell stack 110 from the force applied to the end plate 121 in the load is to be allowed to equilibrate.
[110]
Controller 230 may calculate the coordinates of claim 1 FD curve (C1) 3 and the FD curve point (P) to (C3) are mutually crossed. Further, the control unit 230 based on the coordinates of the intersection point (P) output, the 1 n of the battery cell 111 while the limit state cell stack 110 and the end plate 121 is represented by the parameters are balanced while the forms of can each determine the amount of deformation of the load and the end plate 121 is accordingly applied to the end plate 121. That is, the value of x coordinate of the intersection (P) is the amount of deformation of the end plate 121, y is a value of load applied to the end plate 121.
[111]
Controller 230 may compare the coordinates of the intersection point (P) with a reference range. That is, the controller 230 may determine that the intersection point (P) is located within the reference range. Memory unit 220 may be information is stored for at least one of the first reference range and a second reference range to utilize in evaluating the strength of the end plate 121. A first reference range is defined by a lower limit value (G1) and upper (G2) is associated with the amount of deformation of the end plate 121, the second reference range lower limit value (J1) and the upper limit value associated with the load applied to the end plate 121 It may be defined by (J2). That is, it will if the position value of x of the intersection point (P) in the y value of the second reference range of the first reference point of intersection (P) and located within the range of the end plate 121 having high rigidity and to pass the design criteria, in other cases it will be that having high rigidity and an end plate 121 does not pass the design criteria. Of course, in the first standard when only information on the range is stored in the memory unit 220, independently of y values ​​of the intersection point (P), the processor 230 is the x value of the intersection point (P) the first reference range If the position can be determined that the end plate (121) having high rigidity and to pass the design criteria.
[112]
If, in the case where the coordinate of the intersection point (P) within the predetermined first and second reference range, the controller 230 may output a first test result signal. The first test result signal can be used for indicating the end plate 121 is also passed to the prescribed design basis.
[113]
On the other hand, when the coordinate of the intersection point (P) the first reference range, or is outside a second reference range, the controller 230 may output a second test result signal. The second test result signal can be used for indicating the end plate 121 is also fails the prescribed design basis.
[114]
It is the x-axis value of the point of intersection (P) of claim 1 is greater than the upper limit value (G2) of the reference range, or the y-axis value of the point of intersection (P) is less than the lower limit value (J1) of the second reference range, the end plates 121 It may mean that the stiffness is low. Accordingly, the control unit 230, if the intersection point (P) of the x-axis value is greater than the upper limit of the first reference range, or the y-axis value of the point of intersection (P) is smaller than the lower limit value of the second reference range, the decrease in the first parameter, and it is possible to output a third test result signal indicating that at least one of the required increase in the 3 parameters.
[115]
Is less than the lower limit value (G1) of the x-axis value of the intersection point (P) the first reference range or not the y-axis value of the point of intersection (P) is greater than the upper limit value (J2) of the second reference range, the rigidity of the end plate 121 It may mean that it is excessive. Accordingly, the control unit 230 if the first is less than the lower limit of the reference range, or the y-axis value of the point of intersection (P) is greater than the upper limit value of the second reference range, at least one of the first increase and decrease of the third parameter of the parameter 4 can output a test result signal indicating the need.
[116]
Claim to or separately together with the operation for outputting the second to fourth test result signal, the control unit 230 may adjust at least one of the first parameters and the third parameters. For example, the controller 230 may perform a third test result of at least one of an operation that reduces a first parameter before and after outputting a signal by a first value or to increase a third parameter as a second value. As another example, controller 230 may perform a fourth test result at least one of the operation of increasing the first parameter before and after outputting a signal by a third value or decreasing a third parameter as the fourth value. In this case, the first to fourth values ​​may be predetermined as a positive number.
[117]
9 is a flow chart schematically showing a method for testing the end plate 121 according to another embodiment of the present invention.
[118]
In step 910, the controller 230 generates a one-dimensional model associated with the battery module 100 based on the first parameter. The first parameter is the number of the battery cells 111 included in the battery module 100. Further, by the one-dimensional model, the first front and rear of the two end plates (121-1, 121-2) of the number of battery cells 111, the cell stack 110 are sequentially stacked on each other parameters imply to simulate a structure which is supported on the opposite side.
[119]
In step 915, the controller 230 calculates a second parameter, the third parameter, and based on the one-dimensional model, the first FD curve. The second parameter represents a spring constant of the single-battery cells 111, and the third parameter represents a spring constant of the end plate 121. In addition, the first FD curve, the first corresponding to the relationship between the deformation amount and load of the end plate 121 by the number of battery cells 111, the parameter is shown. Controller 230, and is able to store a first reference data indicating the calculated first FD curve in the memory unit 220.
[120]
In step 920, the controller 230 may calculate the first 3 FD curve based on the first parameter and the 2 FD curve. Controller 230 may determine the second FD curve from the second reference data stored in the memory unit 220. FD second curve corresponds to the relationship between the amount of deformation and the reaction force of the single-battery cells 111, and the FD curve 3 corresponds to a relationship between a deformation amount and a reaction force of the cell stack 110. Amount of deformation of the cell stack 110 is a result of a swelling of the individual battery cells 111 included in the cell stack 110 is reflected.
[121]
In step 925, the controller 230 calculates the coordinates of the intersection point of the curve 1 and the FD 3 FD curve. Intersection point is, the pressing force of the reaction force of the end plate 121 of the cell stack 110 shows a state forming the balance. Controller 230 determines the amount of deformation and weight of the end plate 121 by the swelling of the first number of the battery cells 111 that the parameter is inaction based on the coordinates of the calculated intersection points. Load of the end plate 121 corresponds to the pressing force of the end plate 121 of the cell stack 110.
[122]
In step 930, the controller 230 determines whether or not the intersection point is located within a predetermined reference range.
[123]
In step 935, the control unit 230 when the coordinate of the intersection is within a predetermined reference range, and outputs a first test result signal. The first test result signal can be used for indicating the end plate 121 is also passed to the prescribed design basis. After step 935, the method ends.
[124]
In step 940, the control unit 230 when the coordinates of the intersection point is outside the reference range, and outputs the result of the second test signal. The second test result signal can be used for indicating the end plate 121 is also fails the prescribed design basis.
[125]
In step 945, the control unit 230 adjusts at least one of the first parameters and the third parameters. In this case, the first parameter increases or loss of the third parameter can be determined by the controller 230 from the relationship between the cross point with the reference range. If the first parameter is adjusted in step 945, the method returns to step 910. On the other hand, first, the control unit 230 when the third parameter is the only adjustment returns to step 910 instead of step 915.
[126]
Embodiments of the invention described above may also be implemented through a program or a program recording medium to realize the functions corresponding to the configuration of the embodiments and are therefore not to be implemented through the above, these implementation from the described device, if expert in the art to which the invention pertains will easily implemented.
[127]
The present invention in the above Although the detailed description and specific examples, the invention is not limited by this is described below with the teachings of the present invention by one of ordinary skill in the art available are various changes and modifications within the equivalent scope of the claims. FIG.
[128]
In addition, the present invention is the invention in those skilled in the art belonging to various substitutions may be made without departing from the scope of the present invention, modifications and changes are possible by the above-described embodiments and the accompanying described above It not limited by the drawings, all or a portion of each of the embodiments so that various modifications may be made to be configured by selectively combining.

WE CLAIMS

[Claim 1]An apparatus for testing an end plate mounted to the battery module, and of a second parameter and a spring constant of the end plate showing the spring constant of the first parameter, the battery cell, which represents the number of battery cells included in the battery module a memory unit for storing a third parameter; And on the basis of the first parameter and to generate a one-dimensional model associated with the battery module, and the second parameter and the third parameter, and calculates the first FD curve based on the one-dimensional model, the first FD curve the shown control unit for storing the first reference data in the memory unit; including, but, the first FD curve, corresponding to the relationship between the deformation amount and load of the end plate due to the number of battery cells indicated by the first parameter , end plate test device.
[Claim 2]
The method of claim 1, wherein the one-dimensional model, the first front and back of the number of battery cells are sequentially stacked cell stack, the parameter is shown, characterized in that to simulate a structure supported by the end plate , end plate test device.
[Claim 3]
The method of claim 2, wherein, , using the above equation (1), but calculating the equivalent spring constant of the one-dimensional model, Keq is the equivalent spring constant, n is the number of the battery cells, K1 is the spring constant, the spring constant K2 of, end plate test device of the end plate of the battery cell.[Claim 4]The method of claim 3, wherein, , using the equation (2), but calculating the claim 1 FD curve, F is the force, Δx is applied to the end plate c is the deformation amount of said battery cell , Δx e is the end plates of said end plate deformation test apparatus.
[Claim 5]5. The method of claim 4, wherein said memory unit comprises a second further stores a second reference data indicating the FD curve, and wherein the control unit calculates the first 3 FD curve based on the first parameter and the second FD curve, wherein the 2 FD curve, corresponding to the relationship between the amount of deformation and the reaction force of the battery cell, and wherein the 3 FD curve is, the end plate test device corresponding to the relationship between the amount of deformation and the reaction force of the cell stack.[Claim 6]The method of claim 5, wherein, the first FD curve and the second 3 FD calculating the intersection coordinate of the curve, and the swelling of the number of battery cells in that the first parameter is inaction on the basis of the coordinates of the intersection point , end plate test device for determining the amount of deformation and the load of the end plate by.[Claim 7]
The method of claim 6, wherein, in case the coordinate of the intersection point is within the predetermined reference range, but outputs a first test result signal, the first test result signal, said end plate to pass the prescribed design basis the end plates testing apparatus for notifying.[Claim 8]The method of claim 6, wherein, if the coordinates of the intersection point wherein the reference range is outside, but outputs a second test result signal, the second test result signal, said end plates also fails the prescribed design basis It is intended to inform, end-plate test equipment.[Claim 9]The method of claim 6, wherein, when the coordinates of the intersection point is outside the reference range, said first end plate, adjusting a parameter testing device.[Claim 10]The method of claim 6, wherein, when the coordinates of the intersection point is outside the reference range, the third parameter, the end plate to adjust the test equipment.