Apparatus and method for generating battery information

Abstract

According to an embodiment of the present invention, the apparatus for generating battery information comprises: a profile acquisition unit configured to acquire a battery profile indicating the correspondence between the battery's capacity and voltage; and a control unit configured to set a positive electrode voltage range corresponding to the battery on the basis of a preset negative electrode planar range, adjust a preset reference positive electrode profile and a reference negative electrode profile so as to correspond to the battery profile on the basis of the positive electrode voltage range, and generate the battery's positive electrode profile and negative electrode profile according to the result of adjustment.

Description

Battery information generation device and method

[0001] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0012350, filed January 26, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a battery information generating device and method, and more particularly, to a battery information generating device and method that generate battery information that more accurately reflects the state of a battery.

[0003] Recently, as the demand for portable electronic products such as laptops, video cameras, and mobile phones has rapidly increased, and the development of electric vehicles, energy storage batteries, robots, and satellites has been in full swing, research into high-performance batteries capable of repeated charging and discharging is actively being conducted.

[0004] Currently commercialized batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium batteries. Among these, lithium batteries are receiving attention for their advantages of being able to charge and discharge freely, having a very low self-discharge rate, and having a high energy density, as they have almost no memory effect compared to nickel-based batteries.

[0005] While extensive research is being conducted on these batteries to improve capacity and density, improving lifespan and safety is also crucial. To improve battery safety, technology is required to accurately diagnose the current battery condition.

[0006] The present invention provides a battery information generation device and method capable of generating a more accurate profile that can be used for battery condition diagnosis.

[0007] Various aspects of the present invention can be understood through the following description and will be further clarified by the embodiments of the present invention. Furthermore, it will be readily apparent that various aspects of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0008] A battery information providing device according to one aspect of the present invention may include a profile obtaining unit configured to obtain a battery profile indicating a correspondence between a capacity and a voltage of a battery; and a control unit configured to set a positive voltage section corresponding to the battery based on a preset negative voltage section, adjust a preset reference positive profile and a reference negative profile based on the positive voltage section to correspond to the battery profile, and generate a positive profile and a negative profile of the battery based on the adjustment result.

[0009] The control unit may be configured to set the positive voltage section based on a target voltage section corresponding to the negative flat section and an end voltage of the battery profile.

[0010] The control unit may be configured to set the sum of the lower limit voltage of the target voltage section and the end voltage as the lower limit voltage of the positive voltage section, and to set the sum of the upper limit voltage of the target voltage section and the end voltage as the upper limit voltage of the positive voltage section.

[0011] The control unit may be configured to adjust the reference positive electrode profile and the reference negative electrode profile so that the end voltage of the positive electrode profile is included in the positive electrode voltage range.

[0012] The above cathode flat section can be preset as a capacity section in which the rate of change of voltage with respect to capacity in the above reference cathode profile is less than or equal to a preset reference ratio.

[0013] The above cathode flat section can be preset as a capacity section greater than or equal to the capacity of the target peak included in the reference anode profile and the reference differential profile based on the reference cathode profile.

[0014] The above target peak may be set as the maximum point with the largest corresponding differential voltage among the multiple maximum points included in the reference differential profile.

[0015] The control unit may be configured to provide information about the battery by outputting the positive electrode profile and the negative electrode profile to the outside.

[0016] A battery pack according to another aspect of the present invention may include a battery information generating device according to one aspect of the present invention.

[0017] A vehicle according to another aspect of the present invention may include a battery information generating device according to one aspect of the present invention.

[0018] A battery information generation method according to another aspect of the present invention may include a profile acquisition step of acquiring a battery profile indicating a correspondence between a capacity and a voltage of a battery; a positive voltage section setting step of setting a positive voltage section corresponding to the battery based on a preset negative voltage section; a profile adjustment step of adjusting a preset reference positive profile and a reference negative profile based on the positive voltage section to correspond to the battery profile; and a profile generation step of generating a positive profile and a negative profile of the battery based on an adjustment result of the profile adjustment step.

[0019] According to another aspect of the present invention, a non-transitory computer-readable storage medium may store a computer program for executing a battery information generation method, including a profile acquisition step of acquiring a battery profile indicating a correspondence between a capacity and a voltage of a battery; an anode voltage section setting step of setting a cathode voltage section corresponding to the battery based on a preset cathode flat section; a profile adjustment step of adjusting a preset reference cathode profile and a reference cathode profile based on the cathode voltage section to correspond to the battery profile; and a profile generation step of generating a cathode profile and a cathode profile of the battery based on an adjustment result of the profile adjustment step.

[0020] According to one aspect of the present invention, a battery information generation device can drastically shorten the time for generating a positive profile and a negative profile corresponding to a battery by adjusting a reference positive profile and a reference negative profile by adding a limiting condition that the end voltage of the positive profile is included in the positive voltage range.

[0021] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0022] The following drawings attached to this specification serve to further understand the technical idea of ​​the present invention together with the detailed description of the invention described below, and therefore the present invention should not be interpreted as being limited to the matters described in such drawings.

[0023] FIG. 1 is a schematic diagram illustrating a battery information generation device according to one embodiment of the present invention.

[0024] FIG. 2 is a diagram schematically illustrating a battery profile according to one embodiment of the present invention.

[0025] FIG. 3 is a schematic diagram illustrating a reference anode profile and a reference cathode profile according to one embodiment of the present invention.

[0026] FIG. 4 is a diagram schematically illustrating an adjustment result according to one embodiment of the present invention.

[0027] FIG. 5 is a diagram schematically illustrating a reference differential profile according to one embodiment of the present invention.

[0028] FIG. 6 is a schematic drawing of a battery pack according to another embodiment of the present invention.

[0029] Figure 7 is a schematic drawing of a vehicle according to another embodiment of the present invention.

[0030] FIG. 8 is a diagram schematically illustrating a battery information generation method according to another embodiment of the present invention.

[0031] Terms or words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as meanings and concepts that conform to the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the term to explain his or her own invention in the best possible manner.

[0032] Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0033] In addition, when describing the present invention, if it is determined that the description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

[0034] Terms that include ordinal numbers, such as first, second, etc., are used to distinguish one of the various components from the rest, and are not used to limit the components by such terms.

[0035] Throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise stated.

[0036] Additionally, throughout the specification, when we say that a part is "connected" to another part, this includes not only cases where it is "directly connected" but also cases where it is "indirectly connected" with other elements in between.

[0037]

[0038] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0039] FIG. 1 is a schematic diagram illustrating a battery information generation device (100) according to one embodiment of the present invention.

[0040] Referring to FIG. 1, the battery information generation device (100) may include a profile acquisition unit (110) and a control unit (120).

[0041] Here, the battery, which is the target of information generation, refers to a physically separable, independent cell having a negative terminal and a positive terminal. For example, a lithium-ion battery or a lithium polymer battery may be considered a battery. Furthermore, the battery may be of a cylindrical, prismatic, or pouch type. Furthermore, the battery may refer to a battery bank, battery module, or battery pack in which multiple cells are connected in series and / or parallel. For convenience of explanation, the battery is described below as referring to a single, independent cell.

[0042] The profile acquisition unit (110) may be configured to acquire a battery profile (BP) indicating a correspondence between the capacity and voltage of the battery.

[0043] For example, a battery profile (BP) is a profile that represents the relationship between voltage (V) and capacity (Q) when the battery's SOC is charged from a preset start SOC or 0% to a preset end SOC or 100%. As another example, a battery profile (BP) may represent the relationship between voltage (V) and capacity (Q) when the battery's SOC is discharged from a preset start SOC or 100% to a preset end SOC or 0%.

[0044] For example, there are no specific restrictions on the C-rate during charging or discharging to generate a battery profile (BP). However, to obtain a more accurate battery profile (BP), the battery must be charged or discharged at a low rate. For example, a battery profile (BP) can be generated during the process of charging or discharging a battery at 0.05C.

[0045] For example, the profile acquisition unit (110) can directly read or receive the battery profile (BP) of the battery from the outside. For example, the profile acquisition unit (110) can acquire the battery profile (BP) by being connected to the outside via wire and / or wirelessly to read or receive the battery profile (BP).

[0046] As another example, the profile acquisition unit (110) may generate a battery profile (BP) based on battery information regarding the voltage and capacity of the battery. For example, the profile acquisition unit (110) may acquire a battery profile (BP) by directly generating the battery profile (BP) based on the battery information.

[0047] FIG. 2 is a schematic diagram illustrating a battery profile (BP) according to one embodiment of the present invention. The battery profile (BP) can be expressed as an XY graph in which the horizontal axis, X-axis, is set to capacity (Q, capacity) and the vertical axis, Y-axis, is set to voltage (V, voltage).

[0048] For example, the starting voltage (e.g., the charging start voltage of the battery) of the battery profile (BP) is Vi[V], and the ending voltage (e.g., the charging end voltage of the battery) is Vf[V]. The starting capacity (e.g., the charging start capacity of the battery) of the battery profile (BP) is Qi[Ah], and the ending capacity (e.g., the charging end capacity of the battery) is Qf[Ah].

[0049] In the embodiment of Fig. 2, the starting voltage (Vi) of the battery profile (BP) is 3.0 [V], and the ending voltage (Vf) is 4.0 [V]. In addition, the starting capacity (Qi) of the battery profile (BP) is 5 [Ah], and the ending capacity (Qf) is 45 [Ah].

[0050] The profile acquisition unit (110) may be connected to the control unit (120) so as to be able to communicate with it. For example, the profile acquisition unit (110) may be connected to the control unit (120) via a wire and / or wireless connection. Through this connection, the profile acquisition unit (110) may transmit the acquired battery profile (BP) to the control unit (120). As another example, the control unit (120) may read the battery profile (BP) from the profile acquisition unit (110) at a necessary time.

[0051] The control unit (120) may be configured to set a positive voltage section (PR) corresponding to the battery based on a preset negative voltage plateau section (RR).

[0052] Here, the cathode plateau region (RR) refers to a capacity region where the voltage change of the cathode is minimal as the capacity of the cathode increases. This condition can be preset. For example, a capacity region where the voltage change relative to the capacity is below a certain level can be preset as the cathode plateau region (RR). Examples of the cathode plateau region (RR) will be described later.

[0053] FIG. 3 is a schematic diagram illustrating a reference positive electrode profile (Rp) and a reference negative electrode profile (Rn) according to one embodiment of the present invention. For example, in the embodiment of FIG. 3, a capacity range (35 [Ah] to about 60 [Ah]) in which the change in negative electrode voltage relative to capacity is below a certain level in the reference negative electrode profile (Rn) can be preset as a negative electrode flat range (RR).

[0054] First, the control unit (120) can be configured to set a negative voltage section (NR) corresponding to a negative flat section (RR) and a positive voltage section (PR) based on the end voltage of the battery profile (BP).

[0055] A lower limit capacity and an upper limit capacity of a cathode plateau section (RR) can be set for a preset reference cathode profile (Rn). In addition, a cathode voltage section (NR) can be set as a voltage section including a voltage corresponding to the upper limit capacity of the cathode plateau section (RR) and a voltage corresponding to the lower limit capacity.

[0056] For example, in the embodiment of FIG. 3, the lower limit capacity of the cathode plateau section (RR) is 35 [Ah], and the upper limit capacity is approximately 60 [Ah]. In addition, the voltage corresponding to the lower limit capacity is Vb [V], and the voltage corresponding to the upper limit capacity is Va [V]. Accordingly, the cathode voltage section (NR) can be set to a voltage section of Va to Vb.

[0057] The difference between the positive and negative voltages for the same capacity represents the battery voltage. In other words, the sum of the battery voltage and the negative voltage for the same capacity represents the positive voltage. Therefore, the control unit (120) can set the positive voltage section (PR) based on the voltage included in the negative voltage section (NR) and the battery voltage by considering the correlation among the battery voltage, positive voltage, and negative voltage.

[0058] In general, the capacity at which the negative reaction ends during the charging process of the battery is included in the negative plateau section (RR). In addition, the capacity at which the negative reaction starts during the discharging process of the battery is included in the negative plateau section (RR). For example, the negative voltage corresponding to the end voltage (Vf) of the battery profile (BP) is included in the negative voltage section (NR). Here, since the positive voltage is the sum of the voltage of the battery and the negative voltage, the positive voltage corresponding to the end voltage (Vf) of the battery profile (BP) may be included in the positive voltage section (PR) which is the sum of the end voltage (Vf) of the battery profile (BP) and the negative voltage section (NR). Therefore, the control unit (120) may set the positive voltage section (PR) by adding the negative voltage section (NR) corresponding to the negative plateau section (RR) and the end voltage (Vf) of the battery profile (BP).

[0059] For example, the control unit (120) may be configured to set the sum of the lower limit voltage of the negative voltage section (NR) and the end voltage of the battery profile (BP) as the lower limit voltage of the positive voltage section (PR). In addition, the control unit (120) may be configured to set the sum of the upper limit voltage of the negative voltage section (NR) and the end voltage of the battery profile (BP) as the upper limit voltage of the positive voltage section (PR).

[0060] In the embodiments of FIGS. 2 and 3, the end voltage of the battery profile (BP) is Vf[V], the lower limit voltage of the negative voltage section (NR) is Va[V], and the upper limit voltage of the negative voltage section (NR) is Vb[V]. The control unit (120) can set the sum of the end voltage (Vf) of the battery profile (BP) and the lower limit voltage (Va) of the negative voltage section (NR) as the lower limit voltage (Vc) of the positive voltage section (PR). In addition, the control unit (120) can set the sum of the end voltage (Vf) of the battery profile (BP) and the upper limit voltage (Vb) of the negative voltage section (NR) as the upper limit voltage (Vd) of the positive voltage section (PR). For example, the lower limit voltage (Vc) of the positive voltage section (PR) can be set according to the formula "Vc=Vf+Va", and the upper limit voltage (Vd) of the positive voltage section (PR) can be set according to the formula "Vd=Vf+Vb".

[0061] The control unit (120) may be configured to adjust a preset reference positive profile (Rp) and a reference negative profile (Rn) based on a positive voltage section (PR) to correspond to a battery profile (BP), and to generate a positive profile and a negative profile of the battery according to the adjustment result.

[0062] Here, the reference positive electrode profile (Rp) may be a profile indicating a correspondence between the capacity and voltage of a reference positive electrode cell preset to correspond to the positive electrode of the battery. For example, the reference positive electrode cell may be a positive coin half cell or a positive electrode of a three-electrode cell. And, the reference negative electrode profile (Rn) may be a profile indicating a correspondence between the capacity and voltage of a reference negative electrode cell preset to correspond to the negative electrode of the battery. For example, the reference negative electrode cell may be a negative coin half cell or a negative electrode of a three-electrode cell.

[0063] For example, in the embodiment of FIG. 3, the reference positive profile (Rp) may include a positive engagement start point (pi0) and a positive engagement end point (pf0), and the reference negative profile (Rn) may include a negative engagement start point (ni0) and a negative engagement end point (nf0). In addition, the start voltage of the reference profile (R) corresponds to the voltage difference between the positive engagement start point (pi0) and the negative engagement start point (ni0), and the end voltage of the reference profile (R) corresponds to the voltage difference between the positive engagement end point (pf0) and the negative engagement end point (nf0). Here, the capacity of the negative engagement end point (nf0) may be included in the negative plateau section (RR). In addition, the voltage of the positive engagement end point (pf0) may be included in the positive voltage section (PR).

[0064] The control unit (120) can adjust the reference positive electrode profile (Rp) and the reference negative electrode profile (Rn) to correspond to the battery profile (BP). For example, the control unit (120) can adjust the reference positive electrode profile (Rp) and the reference negative electrode profile (Rn) to generate an adjusted positive electrode profile (Rp') and an adjusted negative electrode profile (Rn'). In addition, the control unit (120) can generate a comparison profile (R') from the adjusted positive electrode profile (Rp') and the adjusted negative electrode profile (Rn'). The control unit (120) can repeatedly adjust the reference positive electrode profile (Rp) and the reference negative electrode profile (Rn) until the comparison profile (R') corresponds to the battery profile (BP).

[0065] For example, the control unit (120) can generate a plurality of comparison profiles (R') by shifting or capacity scaling the reference positive profile (Rp) and the reference negative profile (Rn), and can specify a comparison profile (R') among the plurality of comparison profiles (R') that has a minimum error (e.g., root mean squared error (RMSE)) with respect to the battery profile (BP). Then, the control unit (120) can set an adjusted positive profile (Rp') corresponding to the specified comparison profile (R') as the positive profile of the battery. Then, the control unit (120) can set an adjusted negative profile (Rn') corresponding to the specified comparison profile (R') as the negative profile of the battery. For example, the adjusted positive profile (Rp') and the adjusted negative profile (Rn') corresponding to the specified comparison profile (R') can be estimated as the positive profile and negative profile of the battery, respectively.

[0066] In one embodiment, the control unit (120) may be configured to adjust the reference positive profile (Rp) and the reference negative profile (Rn) such that the end voltage of the positive profile falls within the positive voltage interval (PR). For example, the control unit (120) may adjust the reference positive profile (Rp) and the reference negative profile (Rn) such that the voltage of the positive participation end point of the adjusted positive profile (Rp') falls within the positive voltage interval (PR).

[0067] FIG. 4 is a diagram schematically illustrating an adjustment result according to one embodiment of the present invention.

[0068] For example, in the embodiment of FIG. 4, a reference positive profile (Rp) may be adjusted to generate an adjusted positive profile (Rp'), and a reference negative profile (Rn) may be adjusted to generate an adjusted negative profile (Rn'). The adjusted positive profile (Rp') includes a positive engagement start point (pi') and a positive engagement end point (pf'), and the adjusted negative profile (Rn') includes a negative engagement start point (ni') and a negative engagement end point (nf'). In addition, the start voltage of the comparison profile (R') corresponds to the voltage difference between the positive engagement start point (pi') and the negative engagement start point (ni'), and the end voltage of the comparison profile (R') corresponds to the voltage difference between the positive engagement end point (pf') and the negative engagement end point (nf'). Here, the voltage of the positive engagement end point (pf') of the adjusted positive profile (Rp') may be included in the positive voltage section (PR).

[0069] A battery information generation device (100) according to one embodiment of the present invention can adjust a reference positive electrode profile (Rp) and a reference negative electrode profile (Rn) by adding a limiting condition that the end voltage of the positive electrode profile is included in a positive voltage section (PR).

[0070] According to one embodiment of the present invention, since the battery information generation device (100) does not consider a case in which the end voltage of the positive profile falls outside the positive voltage section (PR) in the process of adjusting the reference positive profile (Rp) and the reference negative profile (Rn), the time for generating the positive profile and the negative profile can be dramatically shortened compared to a case in which the end voltage of the positive profile is not limited. This is because the number of a plurality of comparison profiles (R') to be compared with the battery profile (BP) is reduced due to the limitation condition that the end voltage of the positive profile is included in the positive voltage section (PR).

[0071] And, referring to FIGS. 2 and 4, even if the sizes of the negative voltage section (NR) and the positive voltage section (PR) are the same, there is a significant difference in the corresponding capacity sections. This is because the change in the negative voltage with respect to the capacity is very small compared to the change in the positive voltage with respect to the capacity. For example, limiting the end voltage of the positive profile within the positive voltage section (PR) rather than limiting the end voltage of the negative profile within the negative voltage section (NR) further limits the adjustment conditions of the reference positive profile (Rp) and the reference negative profile (Rn).

[0072] For example, in the embodiment of FIG. 4, if the voltage of the negative participation end point (nf') of the negative profile (Rn') is limited to within the negative voltage section (NR), the voltage of the positive participation end point (pf') of the positive profile (Rp') may be included within the positive voltage section (PR). However, since the capacity difference between the negative participation start point (ni') and the negative termination end point (nf') of the negative profile (Rn') must correspond to the capacity (Qf-Qi) of the battery, the negative participation start point (ni') may be located on an excessively high voltage (or low capacity) side, or the scale of the reference negative profile (Rn) may be excessively changed (e.g., increased). And, since the voltage difference between the positive electrode participation start point (pi') and the negative electrode participation start point (ni') must correspond to the starting voltage (Vi) of the battery profile, the positive electrode participation start point (pi') may be located on the high voltage (or high capacity) side, or the scale of the reference positive electrode profile (Rp) may be excessively changed (e.g., increased). For example, since the rate of change of the negative electrode voltage with respect to the capacity is very small in the negative electrode plateau section (RR), if the voltage of the negative electrode participation end point (nf') of the negative electrode profile (Rn') is limited to within the negative electrode voltage section (NR), it is not easy to derive the comparison profile (R'). Therefore, the battery information generation device (100) can generate the positive electrode profile of the battery more quickly and accurately by setting the adjustment conditions for the positive electrode profile instead of the negative electrode profile.

[0073]

[0074] Meanwhile, the profile acquisition unit (110) and / or control unit (120) provided in the battery information generation device (100) may optionally include a processor, an application-specific integrated circuit (ASIC), another chipset, a logic circuit, a register, a communication modem, a data processing device, etc. known in the art to execute various control logics performed in the present invention. In addition, when the control logic is implemented in software, the profile acquisition unit (110) and / or the control unit (120) may be implemented as a set of program modules. At this time, the program modules may be stored in a memory and executed by the profile acquisition unit (110) and / or the control unit (120). The memory may be located inside or outside the profile acquisition unit (110) and / or the control unit (120), and may be connected to the profile acquisition unit (110) and / or the control unit (120) by various well-known means.

[0075] In addition, the battery information generation device (100) may further include a storage unit (130). The storage unit (130) may store data or programs required for each component of the battery information generation device (100) to perform operations and functions, or data generated in the process of performing operations and functions. The storage unit (130) is not particularly limited in type as long as it is a known information storage means known to be capable of recording, erasing, updating, and reading data. As an example, the information storage means may include a random access memory (RAM), a flash memory, a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a register, etc. In addition, the storage unit (130) may store program codes defining processes executable by the profile acquisition unit (110) and the control unit (120).

[0076] For example, the storage unit (130) may have information indicating the voltages of each of the reference positive electrode participation start point (pi0), the reference positive electrode participation end point (pf0), the reference negative electrode participation start point (ni0), and the reference negative electrode participation end point (nf0) pre-recorded. In addition, the voltage difference between the reference positive electrode participation start point (pi0) and the reference negative electrode participation start point (ni0) may be equal to a first set voltage (e.g., 3.0 [V]). The voltage difference between the reference positive electrode participation end point (pf0) and the reference negative electrode participation end point (nf0) may be equal to a second set voltage (e.g., 4.0 [V]).

[0077]

[0078] Hereinafter, the cathode flat section (RR) is described with reference to FIGS. 3 and 5.

[0079] Generally, the capacity interval after the target peak (tp) is known to be a region where the anode is the dominant reactant, while the cathode is less involved in the reaction. Due to this different reaction participation of the anode and cathode, the rate of change in voltage relative to capacity is not significant during the cathode plateau (RR).

[0080] In one embodiment, the cathode plateau section (RR) can be preset as a capacity section in which the rate of change of voltage with respect to capacity is less than or equal to a preset reference ratio in the reference cathode profile (Rn).

[0081] In the embodiment of Fig. 3, the voltage change rate may be less than the reference rate in the capacity range of 35 [Ah] to about 60 [Ah]. Therefore, the capacity range of 35 [Ah] to about 60 [Ah] may be set as the cathode plateau range (RR).

[0082] In another embodiment, the cathode plateau section (RR) may be preset as a capacity section greater than or equal to the capacity of a target peak (tp) included in a reference differential profile (DR) based on the reference anode profile (Rp) and the reference cathode profile (Rn). Here, the target peak (tp) may be set as a maximum point having the largest corresponding differential voltage among a plurality of maximum points included in the reference differential profile (DR).

[0083] FIG. 5 is a schematic diagram illustrating a reference differential profile (DR) according to one embodiment of the present invention. The reference differential profile (DR) is a profile representing the correspondence between a capacity (Q) and a differential voltage (dV / dQ). Here, the differential voltage (dV / dQ) is a value obtained by differentiating the voltage (V) with respect to the capacity (Q), and represents the instantaneous rate of change of the voltage with respect to the capacity.

[0084] The reference differential profile (DR) according to the embodiment of Fig. 5 is a profile derived by differentiating the reference profile (R) according to the embodiment of Fig. 3 with respect to capacity. The reference differential profile (DR) may include multiple minima and multiple maxima.

[0085] For example, among multiple local maxima, the local maxima with the largest corresponding differential voltage may be set as the target peak (tp). In the embodiment of Fig. 5, among multiple local maxima, the local maxima corresponding to the capacity Qk[Ah] may be determined as the target peak (tp).

[0086] As another example, among multiple local minima, in a capacity section greater than or equal to the capacity of the local minima with the smallest corresponding differential voltage, the local maxima with the largest corresponding differential voltage may be set as the target peak (tp). In the embodiment of Fig. 5, among multiple local minima, the local minima corresponding to the capacity Qn[Ah] has the smallest differential voltage. Therefore, the target peak (tp) may be determined among multiple local maxima included in a capacity section greater than or equal to Qn[Ah].

[0087]

[0088] Below, an embodiment in which the control unit (120) adjusts the reference positive electrode profile (Rp) and the reference negative electrode profile (Rn) is described.

[0089] Referring to FIG. 4, the control unit (120) can generate an adjusted positive electrode profile (Rp') by shrinking or expanding the reference positive electrode profile (Rp) so that the size of the capacity range between two points (pi0, pf0) of the reference positive electrode profile (Rp) matches the size of the capacity range of the battery profile (BP). Accordingly, the capacity difference between the two points (pi', pf') of the adjusted positive electrode profile (Rp') can match the capacity range of the battery profile (BP).

[0090] In addition, the control unit (120) can generate an adjusted negative profile (Rn') by shrinking or expanding the reference negative profile (Rn) so that the size of the capacity range between two points (ni, nf) of the reference negative profile (Rn) matches the size of the capacity range of the battery profile (BP). Accordingly, the capacity difference between the two points (ni', nf') of the adjusted negative profile (Rn') can match the capacity range of the battery profile (BP).

[0091] In Fig. 4, the adjusted anode profile (Rp') is a result of the contraction of the reference anode profile (Rp), and the adjusted cathode profile (Rn') is a result of the expansion of the reference cathode profile (Rn).

[0092] The positive participation end point (pf') on the adjusted positive profile (Rp') corresponds to the positive participation end point (pf) on the reference positive profile (Rp). The negative participation end point (nf') on the adjusted negative profile (Rn') corresponds to the negative participation end point (nf) on the reference negative profile (Rn).

[0093] The capacity difference between the positive engagement start point (pi') and the positive engagement end point (pf') of the adjusted positive electrode profile (Rp') corresponds to the size of the capacity range of the battery profile (BP). Similarly, the capacity difference between the negative engagement start point (ni') and the negative engagement end point (nf') of the adjusted negative electrode profile (Rn') corresponds to the size of the capacity range of the battery profile (BP).

[0094] In addition, the capacity range by the two points (pi', pf') of the adjusted positive electrode profile (Rp') matches the capacity range by the two points (ni', nf') of the adjusted negative electrode profile (Rn'). The control unit (120) can generate a comparison profile (R') by subtracting the profile between the two points (pi', pf') of the adjusted positive electrode profile (Rp') from the profile between the two points (ni', nf') of the adjusted negative electrode profile (Rn').

[0095] The control unit (120) can calculate the error (profile error) between the battery profile (BP) and the comparison profile (R').

[0096] The control unit (120) can adjust the reference positive electrode profile (Rp) and the reference negative electrode profile (Rn) to generate a plurality of comparison profiles (R'), and calculate an error between each of the plurality of comparison profiles (R') and the battery profile (BP). Then, the control unit (120) can specify a comparison profile (R') having the smallest calculated error among the plurality of comparison profiles (R'). Finally, the control unit (120) can set the adjusted positive electrode profile (Rp') corresponding to the specified comparison profile (R') as the positive electrode profile of the battery, and set the corresponding adjusted negative electrode profile (Rn') as the negative electrode profile of the battery.

[0097] In addition, the control unit (120) can map at least two of the adjusted positive profile (Rp'), the adjusted negative profile (Rn'), the positive engagement start point (pi'), the positive engagement end point (pf'), the negative engagement start point (ni'), the negative engagement end point (nf'), the first scale factor, the second scale factor, the comparison profile (R'), and the profile error to each other and record them in the storage unit (130).

[0098] The first scale factor may represent the ratio of the capacity difference between two points (pi', pf') to the capacity difference between two points (pi0, pf0). The second scale factor may represent the ratio of the capacity difference between two points (ni', nf') to the capacity difference between two points (ni0, nf0). For example, the first scale factor is the ratio of the change of the adjusted anode profile (Rp') to the reference anode profile (Rp), which is the anode change ratio. The second scale factor is the ratio of the change of the adjusted cathode profile (Rn') to the reference cathode profile (Rn), which is the cathode change ratio.

[0099]

[0100] The control unit (120) can be configured to provide information about the battery by outputting the positive and negative profiles to the outside.

[0101] According to one embodiment, the control unit (120) may be connected to an external device capable of diagnosing the condition of the battery, such that the control unit (120) can communicate with it via wired and / or wireless communication. The control unit (120) may transmit a positive profile and / or a negative profile to the external device via wired and / or wireless communication. For example, the external device may include a diagnostic device or a server, and any device capable of diagnosing the condition of the battery by analyzing the positive profile and / or the negative profile may be applied without limitation.

[0102] Since the positive profile and negative profile are profiles that are assumed to represent the current state of the battery, the state of the battery can be diagnosed based on the positive profile and negative profile.

[0103] In this way, the battery information generation device (100) can improve the accuracy of battery status diagnosis by generating a positive profile and a negative profile used to diagnose the status of the battery.

[0104]

[0105] The battery information generation device (100) according to the present invention can be applied to a BMS (Battery Management System). For example, the BMS according to the present invention can include the battery information generation device (100) described above. In this configuration, at least some of the components of the battery information generation device (100) can be implemented by supplementing or adding to the functions of the components included in a conventional BMS. For example, the profile acquisition unit (110), control unit (120), and storage unit (130) of the battery information generation device (100) can be implemented as components of the BMS.

[0106] Additionally, the battery information generation device (100) according to the present invention may be provided in a battery pack. For example, the battery pack according to the present invention may include the battery information generation device (100) described above and one or more battery cells. In addition, the battery pack may further include electrical components (relays, fuses, etc.) and a case.

[0107] FIG. 6 is a drawing illustrating an exemplary configuration of a battery pack (10) including a battery information generation device (100) according to one embodiment of the present invention.

[0108] The positive terminal of the battery (11) can be connected to the positive terminal (P+) of the battery pack (10), and the negative terminal of the battery (11) can be connected to the negative terminal (P-) of the battery pack (10).

[0109] The measuring unit (12) can be connected to a first sensing line (SL1), a second sensing line (SL2), and a third sensing line (SL3). For example, the measuring unit (12) can be connected to a positive terminal of the battery (11) through the first sensing line (SL1), and can be connected to a negative terminal of the battery (11) through the second sensing line (SL2). The measuring unit (12) can measure the voltage of the battery (11) based on the voltage measured at each of the first sensing line (SL1) and the second sensing line (SL2).

[0110] And, the measuring unit (12) can be connected to the current measuring unit (A) through the third sensing line (SL3). For example, the current measuring unit (A) can be an ammeter or a shunt resistor capable of measuring the charging current and discharging current of the battery (11). The measuring unit (12) can measure the charging current of the battery (11) through the third sensing line (SL3) to calculate the charging amount. In addition, the measuring unit (12) can measure the discharging current of the battery (11) through the third sensing line (SL3) to calculate the discharging amount.

[0111] For example, the profile acquisition unit (110) can read or receive battery information regarding the voltage and current of the battery from the measurement unit (12). Then, the profile acquisition unit (110) can generate a battery profile (BP) based on the battery information.

[0112] As another example, the profile acquisition unit (110) can read or receive a battery profile (BP) from the measurement unit (12).

[0113] An external device may be connected to the positive terminal (P+) and negative terminal (P-) of the battery pack (10). For example, the external device may be a charging device or a load. In addition, the positive terminal of the battery (11), the positive terminal (P+) of the battery pack (10), the external device, the negative terminal (P-) of the battery pack (10), and the negative terminal of the battery (11) may be electrically connected.

[0114]

[0115] FIG. 7 is a schematic drawing of a vehicle (700) according to another embodiment of the present invention.

[0116] Referring to FIG. 7, a battery pack (710) according to an embodiment of the present invention may be included in a vehicle (700), such as an electric vehicle (EV) or a hybrid vehicle (HV). Furthermore, the battery pack (710) may drive the vehicle (700) by supplying power to a motor through an inverter provided in the vehicle (700). Here, the battery pack (710) may include a battery information generation device (100). For example, the vehicle (700) may include a battery information generation device (100). In this case, the battery information generation device (100) may be an onboard device included in the vehicle (700).

[0117]

[0118] FIG. 10 is a diagram schematically illustrating a battery information generation method according to another embodiment of the present invention.

[0119] Referring to FIG. 10, a battery information generation method may include a profile acquisition step (S100), a positive voltage section setting step (S200), a profile adjustment step (S300), and a profile generation step (S400).

[0120] Each step of the battery information generation method can be performed by the battery information generation device (100). In the following, for convenience of explanation, any content that overlaps with the previously described content will be omitted or briefly described.

[0121] The profile acquisition step (S100) is a step of acquiring a battery profile (BP) indicating a correspondence between the capacity and voltage of a battery, and can be performed by a profile acquisition unit (110).

[0122] For example, the profile acquisition unit (110) can directly read or receive a battery profile (BP) from the outside. For example, the profile acquisition unit (110) can acquire a battery profile (BP) by reading or receiving a battery profile (BP) while being connected to the outside via wire and / or wirelessly.

[0123] As another example, the profile acquisition unit (110) may generate a battery profile (BP) based on battery information regarding the voltage and capacity of the battery. For example, the profile acquisition unit (110) may acquire a battery profile (BP) by directly generating the battery profile (BP) based on the battery information.

[0124] The positive voltage section setting step (S200) is a step of setting a positive voltage section (PR) corresponding to the battery based on a preset negative voltage flat section (RR), and can be performed by the control unit (120).

[0125] The control unit (120) may be configured to set a negative voltage section (NR) corresponding to a negative plateau section (RR) and a positive voltage section (PR) based on the end voltage of the battery profile (BP).

[0126] For example, the control unit (120) may be configured to set the sum of the lower limit voltage of the negative voltage section (NR) and the end voltage of the battery profile (BP) as the lower limit voltage of the positive voltage section (PR). In addition, the control unit (120) may be configured to set the sum of the upper limit voltage of the negative voltage section (NR) and the end voltage of the battery profile (BP) as the upper limit voltage of the positive voltage section (PR).

[0127] The profile adjustment step (S300) is a step of adjusting a preset reference positive profile (Rp) and a reference negative profile (Rn) to correspond to a battery profile (BP) based on a positive voltage section (PR), and can be performed by the control unit (120).

[0128] The control unit (120) can adjust the reference anode profile (Rp) and the reference cathode profile (Rn) so that the voltage of the anode participation end point of the adjusted anode profile (Rp') is included within the anode voltage range (PR).

[0129] The profile creation step (S400) is a step of creating a positive profile and a negative profile of the battery based on the adjustment result of the profile adjustment step, and can be performed by the control unit (120).

[0130] For example, the control unit (120) can generate a plurality of comparison profiles (R') by shifting or capacity scaling the reference positive profile (Rp) and the reference negative profile (Rn), and can specify a comparison profile (R') among the plurality of comparison profiles (R') that has a minimum error with the battery profile (BP). Then, the control unit (120) can set an adjusted positive profile (Rp') corresponding to the specified comparison profile (R') as the positive profile of the battery. Then, the control unit (120) can set an adjusted negative profile (Rn') corresponding to the specified comparison profile (R') as the negative profile of the battery. For example, the adjusted positive profile (Rp') and the adjusted negative profile (Rn') corresponding to the specified comparison profile (R') can be estimated as the positive profile and negative profile of the battery, respectively.

[0131]

[0132] The embodiments of the present invention described above are not implemented only through devices and methods, but may also be implemented through a program that realizes a function corresponding to the configuration of the embodiments of the present invention or a recording medium on which the program is recorded, and such implementation can be easily implemented by an expert in the technical field to which the present invention belongs based on the description of the embodiments described above.

[0133] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical idea of ​​the present invention and the equivalent scope of the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

[0134] In addition, the present invention described above is not limited to the above-described embodiments and the attached drawings, and all or part of each embodiment may be selectively combined and configured so that various modifications can be made, as those skilled in the art can make various substitutions, modifications, and changes within the scope of the technical idea of ​​the present invention.

[0135] (Explanation of symbols)

[0136] 10: Battery pack

[0137] 11: Battery

[0138] 12: Measurement section

[0139] 100: Battery information provider

[0140] 110: Profile acquisition section

[0141] 120: Control unit

[0142] 130: Storage

[0143] 700: Car

[0144] 710: Battery Pack

Claims

1. A profile acquisition unit configured to acquire a battery profile indicating a correspondence between the capacity and voltage of the battery; and A battery information generation device including a control unit configured to set a positive voltage section corresponding to the battery based on a preset negative voltage section, adjust a preset reference positive profile and a reference negative profile to correspond to the battery profile based on the positive voltage section, and generate a positive profile and a negative profile of the battery based on the adjustment result.

2. In paragraph 1, The above control unit, A battery information generation device configured to set the positive voltage section based on the target voltage section corresponding to the negative flat section and the end voltage of the battery profile.

3. In paragraph 2, The above control unit, A battery information generation device configured to set the sum of the lower limit voltage of the target voltage section and the end voltage as the lower limit voltage of the positive voltage section, and to set the sum of the upper limit voltage of the target voltage section and the end voltage as the upper limit voltage of the positive voltage section.

4. In paragraph 1, The above control unit, A battery information generation device configured to adjust the reference positive electrode profile and the reference negative electrode profile so that the end voltage of the positive electrode profile is included in the positive electrode voltage range.

5. In paragraph 1, The above cathode flat section is, A battery information generating device preset to a capacity section in which the rate of change in voltage for capacity in the above reference cathode profile is less than or equal to a preset reference rate.

6. In paragraph 1, The above cathode flat section is, A battery information generating device preset to a capacity section greater than or equal to the capacity of a target peak included in a reference differential profile based on the above reference positive electrode profile and the above reference negative electrode profile.

7. In paragraph 6, The above target peak is, A battery information generation device in which a maximum point having the largest corresponding differential voltage is set among multiple maximum points included in the above-mentioned reference differential profile.

8. In paragraph 1, The above control unit, A battery information generation device configured to provide information about the battery by outputting the positive electrode profile and the negative electrode profile to the outside.

9. A battery pack including a battery information generation device according to any one of claims 1 to 8.

10. A vehicle including a battery information generation device according to any one of claims 1 to 8.

11. A profile acquisition step for acquiring a battery profile indicating the correspondence between the capacity and voltage of the battery; A positive voltage range setting step for setting a positive voltage range corresponding to the battery based on a preset negative voltage range; A profile adjustment step for adjusting a preset reference positive profile and reference negative profile to correspond to the battery profile based on the positive voltage section; and A battery information generation method including a profile generation step for generating a positive electrode profile and a negative electrode profile of the battery according to the adjustment result of the above profile adjustment step.

12. A profile acquisition step for acquiring a battery profile indicating the correspondence between the capacity and voltage of the battery; A positive voltage range setting step for setting a positive voltage range corresponding to the battery based on a preset negative voltage range; A profile adjustment step for adjusting a preset reference positive profile and reference negative profile to correspond to the battery profile based on the positive voltage section; and A non-transitory computer-readable storage medium storing a computer program for executing a battery information generation method including a profile generation step of generating a positive electrode profile and a negative electrode profile of the battery according to an adjustment result of the above profile adjustment step.

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