JP6435769B2 - Charging rate calculation device, battery system, and charging rate calculation method - Google Patents
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Description
本発明は、充電率算出装置、電池システム及び充電率算出方法に関する。 The present invention relates to a charging rate calculation device, a battery system, and a charging rate calculation method.
電池システム（例えば、下記特許文献１参照）は、電池から外部の負荷に電力を供給するための放電処理を行うと共に、電池を充電する充電処理を行うものである。このような電池システムでは、電池の現在充電率を表示するために、放電時の電流及び充電時の電流の積分値を算出し、電池の総容量における積分値の比率を求め、該比率を現在の充電率に加算することで、電池の現在充電率を算出している。しかしながら、上記方法では、放電時の電流及び充電時の電流を検出する際の検出誤差等が積み重なり、算出した現在充電率と、実際の充電率との差が開いてしまうという問題があった。そのため、満充電時に検出されるべき電池電圧及び電流が検出された場合には、電池の充電率を１００％に補正する。 A battery system (for example, refer to Patent Document 1 below) performs a discharging process for supplying electric power from a battery to an external load, and also performs a charging process for charging the battery. In such a battery system, in order to display the current charging rate of the battery, the integrated value of the current during discharging and the current during charging is calculated, the ratio of the integrated value in the total capacity of the battery is obtained, and the ratio is calculated as follows. The current charging rate of the battery is calculated by adding to the charging rate. However, the above-described method has a problem in that a detection error at the time of detecting a current during discharging and a current during charging are accumulated, and a difference between the calculated current charging rate and the actual charging rate is widened. Therefore, when the battery voltage and current that should be detected at full charge are detected, the charge rate of the battery is corrected to 100%.
しかしながら、上記従来技術では、電池の充電率の算出結果が実際の充電率よりも低い場合には、満充電時に検出されるべき電池電圧及び電流が検出されると、表示している充電率が１００％よりも低い値であるにもかかわらず、表示している充電率を急激に１００％に変化させなければならず、また、電池の充電率の算出結果が実際の充電率よりも高い場合には、表示している充電率が１００％であるにもかかわらず、充電を継続するという、ユーザから見ると不自然な動作をしていた。 However, in the above prior art, when the battery charge rate calculation result is lower than the actual charge rate, when the battery voltage and current to be detected at full charge are detected, the displayed charge rate is Even if the value is lower than 100%, the displayed charging rate must be suddenly changed to 100%, and the calculation result of the battery charging rate is higher than the actual charging rate. In this case, although the displayed charging rate is 100%, an unnatural operation from the user's point of view of continuing charging is performed.
本発明は、上述した事情に鑑みてなされたものであり、ユーザから見て不自然な動作とならないようにする、ことを目的とする。 The present invention has been made in view of the above-described circumstances, and an object thereof is to prevent an unnatural operation from the viewpoint of the user.
上記目的を達成するために、本発明では、充電率算出装置に係る解決手段として、電池の現在充電率を算出し、表示装置に表示させる充電率算出装置であって、前記電池の満充電状態時の第１電圧と該第１電圧よりも低い第２電圧との間に前記電池の現在電圧が位置する場合、前記現在電圧と前記第２電圧との差を前記第１電圧と前記第２電圧との差によって割った除算値に、満充電状態時の充電率である１００パーセントと前記現在電圧が前記第２電圧に略等しくなった時点での電流積算によって算出した第２充電率との差を乗算して乗算値を算出し、該乗算値を前記第２充電率に加算した加算値を前記電池の前記現在充電率とする、という手段を採用する。 In order to achieve the above object, in the present invention, as a means for solving a charging rate calculation device, a charging rate calculation device that calculates a current charging rate of a battery and displays it on a display device, the battery being fully charged When the current voltage of the battery is located between the first voltage at the time and the second voltage lower than the first voltage, the difference between the current voltage and the second voltage is calculated as the first voltage and the second voltage. The divided value divided by the difference between the voltage and the second charging rate calculated by integrating the current when the current voltage becomes substantially equal to the second voltage is 100%, which is the charging rate in the fully charged state. A means is used in which a multiplication value is calculated by multiplying the difference, and an addition value obtained by adding the multiplication value to the second charging rate is used as the current charging rate of the battery.
本発明では、電池システムに係る解決手段として、電池と、上記解決手段を採用する充電率算出装置と、表示装置とを具備し、前記充電率算出装置は、前記電池の前記現在充電率を前記表示装置に表示させる、という手段を採用する。 In the present invention, the battery system includes a battery, a charge rate calculation device employing the solution, and a display device, and the charge rate calculation device calculates the current charge rate of the battery. A means of displaying on a display device is adopted.
本発明では、充電率算出方法に係る第１の解決手段として、電池の現在充電率を算出し、表示装置に表示させる充電率算出方法であって、電池の満充電状態時の第１電圧と該第１電圧よりも低い第２電圧との間に前記電池の現在電圧が位置する場合、前記現在電圧と前記第２電圧との差を前記第１電圧と前記第２電圧との差によって割った除算値に、満充電状態時の充電率である１００パーセントと前記現在電圧が前記第２電圧に略等しくなった時点での電流積算によって算出した第２充電率との差を乗算して乗算値を算出し、該乗算値を前記第２充電率に加算した加算値を前記電池の前記現在充電率とする、という手段を採用する。 In the present invention, as a first solving means related to the charging rate calculation method, the current charging rate of the battery is calculated and displayed on the display device, and the first voltage when the battery is fully charged is When the current voltage of the battery is located between a second voltage lower than the first voltage, the difference between the current voltage and the second voltage is divided by the difference between the first voltage and the second voltage. The divided value is multiplied by the difference between 100%, which is the charging rate in the fully charged state, and the second charging rate calculated by current integration when the current voltage becomes substantially equal to the second voltage. A means is used in which a value is calculated and an addition value obtained by adding the multiplication value to the second charging rate is used as the current charging rate of the battery.
本発明では、充電率算出方法に係る第２の解決手段として、電池の電圧が前記電池の満充電を示す電圧より低い所定の閾値電圧より大きいか否かを判定するステップを有し、前記電池の電圧が、前記閾値電圧以下の場合には前記電池に対する充電電流の積分値に基づき前記電池の充電率を算出する一方で、前記電池の電圧が前記閾値電圧より大きい場合には、前記電池が満充電であることを示す充電率に向かって滑らかに増加する、という手段を採用する。 In the present invention, as a second solving means related to the charging rate calculation method, the battery has a step of determining whether or not a voltage of the battery is larger than a predetermined threshold voltage lower than a voltage indicating a full charge of the battery, When the voltage of the battery is equal to or lower than the threshold voltage, the charging rate of the battery is calculated based on the integrated value of the charging current for the battery. A means of smoothly increasing toward a charging rate indicating full charge is employed.
本発明によれば、電池の現在充電率を算出し、表示装置に表示させる充電率算出装置であって、電池の満充電状態時の第１電圧と該第１電圧よりも低い第２電圧との間に現在電圧が位置する場合、現在電圧と第２電圧との差を第１電圧と第２電圧との差によって割った除算値に、満充電状態時の充電率である１００パーセントと現在電圧が第２電圧に略等しくなった時点での電流積算によって算出した第２充電率との差を乗算して乗算値を算出し、該乗算値を第２充電率に加算した加算値を電池の現在充電率とすることによって、ユーザから見て不自然な動作とならないようにすることができる。 According to the present invention, a charging rate calculation device that calculates a current charging rate of a battery and displays the current charging rate on a display device, the first voltage when the battery is fully charged and a second voltage lower than the first voltage, When the current voltage is located between the current voltage and the second voltage divided by the difference between the first voltage and the second voltage, 100% which is the charging rate in the fully charged state The multiplication value is calculated by multiplying the difference from the second charging rate calculated by current integration at the time when the voltage becomes substantially equal to the second voltage, and the added value obtained by adding the multiplication value to the second charging rate is the battery. By using the current charging rate, it is possible to prevent an unnatural operation from the viewpoint of the user.
以下、図面を参照して、本発明の実施形態について説明する。
本実施形態に係る電池システムは、フォークリフト等の各種電動装置に搭載され、充電器Ｊに接続されて充電される際の電池Ｅの充電処理や、電力消費時の電池Ｅの放電処理を行うものである。なお、上記充電器Ｊは、電池システムに対して着脱可能である。
Embodiments of the present invention will be described below with reference to the drawings.
The battery system according to the present embodiment is mounted on various electric devices such as forklifts, and performs a charging process of the battery E when connected to the charger J and a discharging process of the battery E when power is consumed. It is. The charger J is detachable from the battery system.
本電池システムは、図１に示すように、接続端子Ｔ、電池Ｅ、放電回路Ｈ１〜Ｈｎ、電圧センサＤ、電流センサＹ、充電用スイッチング素子ＢＳ及びマイコンＭ（充電率算出装置）を備える。 As shown in FIG. 1, the battery system includes a connection terminal T, a battery E, discharge circuits H1 to Hn, a voltage sensor D, a current sensor Y, a charging switching element BS, and a microcomputer M (charging rate calculation device).
接続端子Ｔは、本電池システムに充電器Ｊが装着された際に、該充電器Ｊに電気的に接続される端子である。
電池Ｅは、リチウムイオン電池等の蓄電池（二次電池）であるｎ個の電池セルＣ１〜Ｃｎかなり、電池セルＣ１〜Ｃｎが直列に接続された電池モジュールである。また、直列に接続された電池セルＣ１〜Ｃｎのうち、一方の端に配置された電池セルＣ１は、その正極に、充電用スイッチング素子ＢＳを介して、接続端子Ｔが接続されている。
The connection terminal T is a terminal that is electrically connected to the charger J when the charger J is attached to the battery system.
The battery E is a battery module in which battery cells C1 to Cn are connected in series rather than n battery cells C1 to Cn that are storage batteries (secondary batteries) such as lithium ion batteries. In addition, the battery cell C1 arranged at one end among the battery cells C1 to Cn connected in series has a connection terminal T connected to the positive electrode via the charging switching element BS.
放電回路Ｈ１〜Ｈｎは、各電池セルＣ１〜Ｃｎに設けられ、マイコンＭから入力される制御信号に基づいて電池セルＣ１〜Ｃｎを放電するものである。このような放電回路Ｈ１〜Ｈｎは、図１に示すように、放電用スイッチング素子ＡＳ１〜ＡＳｎ及び抵抗器Ｒ１〜Ｒｎから構成されている。 The discharge circuits H1 to Hn are provided in the battery cells C1 to Cn, and discharge the battery cells C1 to Cn based on a control signal input from the microcomputer M. As shown in FIG. 1, such discharge circuits H1 to Hn include discharge switching elements AS1 to ASn and resistors R1 to Rn.
なお、各放電回路Ｈ１〜Ｈｎは同じ構成であるので、放電回路Ｈ１の放電用スイッチング素子ＡＳ１及び抵抗器Ｒ１についてのみ説明し、放電回路Ｈ２〜Ｈｎについては説明を省略する。 Since the discharge circuits H1 to Hn have the same configuration, only the discharge switching element AS1 and the resistor R1 of the discharge circuit H1 will be described, and the description of the discharge circuits H2 to Hn will be omitted.
放電用スイッチング素子ＡＳ１は、例えば、バイポーラトランジスタであり、ベース端子がマイコンＭに接続され、エミッタ端子が電池セルＣ１の正極に接続され、コレクタ端子が抵抗器Ｒ１の一端に接続されている。 The discharging switching element AS1 is, for example, a bipolar transistor, and has a base terminal connected to the microcomputer M, an emitter terminal connected to the positive electrode of the battery cell C1, and a collector terminal connected to one end of the resistor R1.
このような放電用スイッチング素子ＡＳ１は、マイコンＭから電圧値がハイレベルである制御信号がベース端子に入力されるとオン状態となって、電池セルＣ１の電力を抵抗器Ｒ１に放電する。一方、放電用スイッチング素子ＡＳ１は、電圧値がハイレベルである制御信号がベース端子に入力されないと、オフ状態となって、電池セルＣ１から抵抗器Ｒ１への放電を停止する。 The discharge switching element AS1 is turned on when a control signal having a high voltage value is input from the microcomputer M to the base terminal, and discharges the power of the battery cell C1 to the resistor R1. On the other hand, when a control signal having a high voltage value is not input to the base terminal, the discharging switching element AS1 is turned off and stops discharging from the battery cell C1 to the resistor R1.
また、放電用スイッチング素子ＡＳ１は、バイポーラトランジスタ以外にも、例えばＦＥＴトランジスタ（Field Effect Transistor：電界効果トランジスタ）やＩＧＢＴ（Insulated Gate Bipolar Transistor：絶縁ゲートバイポーラトランジスタ）であってもよい。 In addition to the bipolar transistor, the discharge switching element AS1 may be, for example, an FET transistor (Field Effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor).
抵抗器Ｒ１は、一端が放電用スイッチング素子ＡＳ１のコレクタ端子に接続され、他端が電池セルＣ１の負極に接続されている。このような抵抗器Ｒ１は、放電用スイッチング素子ＡＳ１がオン状態となると、電池セルＣ１から電力が入力され、該電力を熱エネルギーに変換する、つまり発熱する。
電圧センサＤは、電池Ｅの電圧を検出し、検出した電圧値を示す電圧検出信号をマイコンＭに出力する。
電流センサＹは、電池Ｅの電流を検出し、検出した電流値を示す電流検出信号をマイコンＭに出力する。
One end of the resistor R1 is connected to the collector terminal of the discharging switching element AS1, and the other end is connected to the negative electrode of the battery cell C1. When the discharge switching element AS1 is turned on, the resistor R1 receives electric power from the battery cell C1 and converts the electric power into heat energy, that is, generates heat.
The voltage sensor D detects the voltage of the battery E and outputs a voltage detection signal indicating the detected voltage value to the microcomputer M.
The current sensor Y detects the current of the battery E and outputs a current detection signal indicating the detected current value to the microcomputer M.
充電用スイッチング素子ＢＳは、例えば、バイポーラトランジスタであり、ベース端子がマイコンＭに接続され、エミッタ端子が接続端子Ｔに接続され、コレクタ端子が電池セルＣ１の正極に接続されている。このような充電用スイッチング素子ＢＳは、マイコンＭから電圧値がハイレベルである制御信号がベース端子に入力されるとオン状態となって、充電器Ｊによる電池セルＣ１〜Ｃｎへの充電を開始する。 The charging switching element BS is, for example, a bipolar transistor, and has a base terminal connected to the microcomputer M, an emitter terminal connected to the connection terminal T, and a collector terminal connected to the positive electrode of the battery cell C1. The charging switching element BS is turned on when a control signal having a high voltage value is input from the microcomputer M to the base terminal, and charging of the battery cells C1 to Cn by the charger J is started. To do.
一方、充電用スイッチング素子ＢＳは、電圧値がハイレベルである制御信号がベース端子に入力されないと、オフ状態となって、充電器Ｊによる電池セルＣ１〜Ｃｎへの充電を停止する。 On the other hand, when the control signal having a high voltage value is not input to the base terminal, the charging switching element BS is turned off and stops charging the battery cells C1 to Cn by the charger J.
また、充電用スイッチング素子ＢＳは、バイポーラトランジスタ以外にも、例えばＦＥＴトランジスタ（Field Effect Transistor：電界効果トランジスタ）やＩＧＢＴ（Insulated Gate Bipolar Transistor：絶縁ゲートバイポーラトランジスタ）であってもよい。 In addition to the bipolar transistor, the charging switching element BS may be, for example, an FET transistor (Field Effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor).
表示装置Ｄｐは、例えば液晶ディスプレイまたは有機ＥＬ（Electronic Luminescent）ディスプレイ等であり、マイコンＭから入力される画像信号に基づいて画像や文字からなる各種画面を表示する。例えば、表示装置Ｄｐは、マイコンＭから入力される画像信号に基づいて電池Ｅの現在充電率を表示する。 The display device Dp is, for example, a liquid crystal display or an organic EL (Electronic Luminescent) display, and displays various screens composed of images and characters based on image signals input from the microcomputer M. For example, the display device Dp displays the current charging rate of the battery E based on the image signal input from the microcomputer M.
マイコンＭは、ＣＰＵ（Central Processing Unit）、ＲＯＭ（Read Only Memory）、ＲＡＭ（Random Access Memory）及び電気的に相互接続された各部と各種信号の送受信を行うインターフェイス回路等から構成されたＩＣチップである。 The microcomputer M is an IC chip composed of a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an interface circuit that transmits and receives various signals to / from each electrically connected part. is there.
このマイコンＭは、上記ＲＯＭに記憶された各種演算制御プログラムに基づいて各種の演算処理を行うと共に各部と通信を行うことにより電池システムの全体動作を制御する。詳細については後述するが、マイコンＭは、電圧センサＤによる検出結果を用いて電池Ｅの現在充電率を算出する。 The microcomputer M controls the overall operation of the battery system by performing various arithmetic processes based on various arithmetic control programs stored in the ROM and communicating with each unit. Although details will be described later, the microcomputer M calculates the current charging rate of the battery E using the detection result of the voltage sensor D.
次に、このように構成された本電池システムの動作について説明する。
本電池システムは、例えば、フォークリフトに搭載されている場合、各電池セルＣ１〜Ｃｎの充電率が低減した状態となると、担当作業者によって、充電器Ｊが装着される。そして、本電池システムは、充電時に、表示装置Ｄｐに電池Ｅの現在充電率を表示するが、表示するための現在充電率を算出する際に、以下の特徴的な動作を実行する。
Next, the operation of the battery system configured as described above will be described.
For example, when the battery system is mounted on a forklift, when the charging rate of each of the battery cells C1 to Cn is reduced, the charger J is attached by the worker in charge. And this battery system displays the present charge rate of the battery E on the display apparatus Dp at the time of charge, When calculating the present charge rate for displaying, the following characteristic operation | movement is performed.
電池システムにおいて、マイコンＭは、電池の満充電状態時の第１電圧Ｖ１と該第１電圧Ｖ１よりも低い第２電圧Ｖ２との間に電池Ｅの現在電圧Ｖが位置するか否か判定する（ステップＳ１）。マイコンＭは、第１電圧Ｖ１と第２電圧Ｖ２との間に現在電圧Ｖが位置しない場合（ＮＯの場合）、電流センサＹによって検出した充電時の電流の積分値を算出し、電池の総容量における積分値の比率を求め、該比率を現在の充電率に加算することで、電池の現在充電率を算出する（ステップＳ２）。 In the battery system, the microcomputer M determines whether or not the current voltage V of the battery E is located between the first voltage V1 when the battery is fully charged and the second voltage V2 lower than the first voltage V1. (Step S1). When the current voltage V is not located between the first voltage V1 and the second voltage V2 (in the case of NO), the microcomputer M calculates the integral value of the current detected during charging detected by the current sensor Y, and calculates the total battery A current charge rate of the battery is calculated by obtaining a ratio of the integral value in the capacity and adding the ratio to the current charge rate (step S2).
一方、マイコンＭは、第１電圧Ｖ１と第２電圧Ｖ２との間に現在電圧Ｖが位置する場合（ＹＥＳの場合）、現在電圧Ｖと第２電圧Ｖ２との差を第１電圧Ｖ１と第２電圧Ｖ２との差によって割った除算値に、満充電状態時の充電率である１００パーセントと現在電圧Ｖが第２電圧Ｖ２に等しくなった時点での電流積算によって算出した第２充電率Ｘとの差を乗算して乗算値を算出し、該乗算値を第２充電率Ｘに加算した加算値を電池の現在充電率Ｓとし（ステップＳ３）、現在充電率Ｓを表示装置Ｄｐに表示させる（ステップＳ４）。 On the other hand, when the current voltage V is located between the first voltage V1 and the second voltage V2 (in the case of YES), the microcomputer M determines the difference between the current voltage V and the second voltage V2 as the first voltage V1 and the second voltage V2. The second charging rate X calculated by integrating the current value when the current voltage V becomes equal to the second voltage V2 and 100% that is the charging rate in the fully charged state is divided by the division value divided by the difference between the two voltages V2. Is added to the second charging rate X to obtain the current charging rate S of the battery (step S3), and the current charging rate S is displayed on the display device Dp. (Step S4).
つまり、マイコンＭは、第１電圧Ｖ１と第２電圧Ｖ２との間に現在電圧Ｖが位置する場合、以下（１）式に基づいて現在充電率Ｓを算出し、該現在充電率Ｓを表示装置Ｄｐに表示させる。
現在充電率Ｓ［％］＝Ｘ＋（１００−Ｘ）×（Ｖ−Ｖ２）÷（Ｖ１−Ｖ２）…（１）
なお、第２充電率Ｘを算出するために必要な電流値として、電流センサＹによる電流検出信号によって示されるものを使用する。
That is, when the current voltage V is located between the first voltage V1 and the second voltage V2, the microcomputer M calculates the current charging rate S based on the following equation (1), and displays the current charging rate S. It is displayed on the device Dp.
Current charging rate S [%] = X + (100−X) × (V−V2) ÷ (V1−V2) (1)
Note that, as the current value necessary for calculating the second charging rate X, the value indicated by the current detection signal from the current sensor Y is used.
なお、上記式（１）はあくまで一例に過ぎず、当業者の通常の創作能力の発揮の範疇で創出され得る他の式を用いてよいことは言うまでもない。すなわち、本実施の形態においては、電池の電圧が前記電池の満充電を示す電圧より低い所定の閾値電圧より大きいか否かを判定するステップを有し、前記電池の電圧が、前記閾値電圧以下の場合には前記電池に対する充電電流の積分値に基づき前記電池の充電率を算出する一方で、前記電池の電圧が前記閾値電圧より大きい場合には、前記電池が満充電であることを示す充電率に向かって滑らかに増加するよう補正された充電率を算出する。この技術的思想に含まれるものは、すべて本発明に技術的範囲に属するものである。 In addition, the said Formula (1) is only an example to the last, and it cannot be overemphasized that the other formula which can be created in the category of the normal production ability of those skilled in the art may be used. That is, in the present embodiment, there is a step of determining whether or not the voltage of the battery is greater than a predetermined threshold voltage that is lower than the voltage indicating the full charge of the battery, and the voltage of the battery is equal to or lower than the threshold voltage. In the case of calculating the charging rate of the battery based on the integral value of the charging current for the battery, the battery indicates that the battery is fully charged when the voltage of the battery is greater than the threshold voltage. The charging rate corrected so as to increase smoothly toward the rate is calculated. Anything included in this technical idea belongs to the technical scope of the present invention.
このことにより、本実施の形態では、従来技術のように、急激に充電率が変化することがなくなり、ユーザにとって不自然な動作とならない。 Thus, in the present embodiment, the charging rate does not change abruptly as in the prior art, and the operation is not unnatural for the user.
例えば、電池Ｅにおける電池電圧と充電率とは、図３に示すように遷移する。なお、図３に示す（ａ）は電池の現在充電率Ｓに対する算出結果が実際の充電率よりも高い場合における現在充電率Ｓの遷移を示し、図３に示す（ｂ）は現在充電率Ｓに対する算出結果が実際の充電率よりも低い場合における現在充電率Ｓの遷移を示している。 For example, the battery voltage and the charging rate in the battery E transition as shown in FIG. 3A shows transition of the current charging rate S when the calculation result for the current charging rate S of the battery is higher than the actual charging rate, and FIG. 3B shows the current charging rate S. The transition of the current charging rate S when the calculation result for is lower than the actual charging rate is shown.
このような本実施形態によれば、電池Ｅの現在充電率Ｓを算出し、表示装置Ｄｐに表示させる電池システムであって、電池Ｅの満充電状態時の第１電圧Ｖ１と該第１電圧Ｖ１よりも低い第２電圧Ｖ２との間に現在電圧Ｖが位置する場合、現在電圧Ｖと第２電圧Ｖ２との差を第１電圧Ｖ１と第２電圧Ｖ２との差によって割った除算値に、満充電状態時の充電率である１００パーセントと現在電圧Ｖが第２電圧Ｖ２に等しくなった時点での電流積算によって算出した第２充電率Ｘとの差を乗算して乗算値を算出し、該乗算値を第２充電率Ｘに加算した加算値を電池の現在充電率Ｓとすることによって、図３（ａ）や（ｂ）のように、現在充電率Ｓが緩やかに変化するので、ユーザから見て不自然な動作とならないようにすることができる。 According to this embodiment, the battery system calculates the current charging rate S of the battery E and displays it on the display device Dp, and the first voltage V1 and the first voltage when the battery E is in a fully charged state. When the current voltage V is positioned between the second voltage V2 lower than V1, the difference between the current voltage V and the second voltage V2 is divided by the difference between the first voltage V1 and the second voltage V2. The multiplication value is calculated by multiplying the difference between 100%, which is the charging rate in the fully charged state, and the second charging rate X calculated by current integration when the current voltage V becomes equal to the second voltage V2. Since the addition value obtained by adding the multiplication value to the second charging rate X is used as the current charging rate S of the battery, the current charging rate S changes gradually as shown in FIGS. 3 (a) and 3 (b). It is possible to prevent an unnatural operation from the viewpoint of the user.
以上、本発明の実施形態について説明したが、本発明は上記実施形態に限定されることなく、例えば以下のような変形が考えられる。
本実施形態は、フォークリフト以外の電動装置に搭載されてもよい。
As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, For example, the following modifications can be considered.
This embodiment may be mounted on an electric device other than a forklift.
Ｔ…接続端子、Ｃ１〜Ｃｎ…電池セル、Ｈ１〜Ｈｎ…放電回路、Ｄ…電圧センサ、Ｙ…電流センサ、ＢＳ…充電用スイッチング素子、Ｍ…マイコン、Ｊ…充電器、ＡＳ１〜ＡＳｎ…放電用スイッチング素子、Ｒ１〜Ｒｎ…抵抗器、Ｄｐ…表示装置 T: connection terminal, C1-Cn: battery cell, H1-Hn ... discharge circuit, D ... voltage sensor, Y ... current sensor, BS ... switching element for charging, M ... microcomputer, J ... charger, AS1-ASn ... discharge Switching elements, R1 to Rn ... resistors, Dp ... display devices
Claims (3)
前記電池の満充電状態時の第１電圧と該第１電圧よりも低い第２電圧との間に前記電池の現在電圧が位置する場合、前記現在電圧と前記第２電圧との差を前記第１電圧と前記第２電圧との差によって割った除算値に、満充電状態時の充電率である１００パーセントと前記現在電圧が前記第２電圧に等しくなった時点での電流積算によって算出した第２充電率との差を乗算して乗算値を算出し、該乗算値を前記第２充電率に加算した加算値を前記電池の前記現在充電率とすることを特徴とする充電率算出装置。 A charging rate calculation device that calculates a current charging rate of a battery and displays the current charging rate on a display device,
When the current voltage of the battery is located between a first voltage when the battery is fully charged and a second voltage lower than the first voltage, a difference between the current voltage and the second voltage is calculated as the first voltage. The divided value divided by the difference between the first voltage and the second voltage is calculated by the current integration at the time when the current voltage becomes equal to the second voltage and 100% which is the charging rate in the fully charged state. The charge rate calculation apparatus according to claim 1, wherein a multiplication value is calculated by multiplying a difference between the two charge rates and an addition value obtained by adding the multiplication value to the second charge rate is used as the current charge rate of the battery.
請求項１に記載の充電率算出装置と、
表示装置とを具備し、
前記充電率算出装置は、前記電池の前記現在充電率を前記表示装置に表示させることを特徴とする電池システム。 Battery,
The charging rate calculation device according to claim 1;
A display device,
The battery rate calculation device causes the display device to display the current charge rate of the battery.
電池の満充電状態時の第１電圧と該第１電圧よりも低い第２電圧との間に前記電池の現在電圧が位置する場合、前記現在電圧と前記第２電圧との差を前記第１電圧と前記第２電圧との差によって割った除算値に、満充電状態時の充電率である１００パーセントと前記現在電圧が前記第２電圧に等しくなった時点での電流積算によって算出した第２充電率との差を乗算して乗算値を算出し、該乗算値を前記第２充電率に加算した加算値を前記電池の前記現在充電率とすることを特徴とする充電率算出方法。 A charge rate calculation method for calculating a current charge rate of a battery and causing a display device to display the charge rate,
When the current voltage of the battery is located between a first voltage when the battery is fully charged and a second voltage lower than the first voltage, the difference between the current voltage and the second voltage is calculated as the first voltage. The divided value divided by the difference between the voltage and the second voltage is 100% which is a charging rate in a fully charged state and the second calculated by current integration at the time when the current voltage becomes equal to the second voltage. A charging rate calculation method, wherein a multiplication value is calculated by multiplying a difference from a charging rate, and an addition value obtained by adding the multiplication value to the second charging rate is used as the current charging rate of the battery.
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