TW200905947A - Apparatus and method for measuring internal resistance of battery - Google Patents

Apparatus and method for measuring internal resistance of battery Download PDF

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Publication number
TW200905947A
TW200905947A TW096126535A TW96126535A TW200905947A TW 200905947 A TW200905947 A TW 200905947A TW 096126535 A TW096126535 A TW 096126535A TW 96126535 A TW96126535 A TW 96126535A TW 200905947 A TW200905947 A TW 200905947A
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Taiwan
Prior art keywords
battery
resistor
internal resistance
unit
resistance
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TW096126535A
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Chinese (zh)
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TWI398028B (en
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Shih-Fang Wong
Tsung-Jen Chuang
Jun-Wei Zhang
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Hon Hai Prec Ind Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Tests Of Electric Status Of Batteries (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

An apparatus for Measuring an internal resistance of a battery includes a charging unit, a switch, a detecting unit, and a computing unit. The charging unit is configured for charging up to the battery via a first resistance (R1) and a second resistance (R2). The switch is configured for selectively connecting the first resistance and the second resistance to the battery. The detecting unit is configured for detecting a first voltage (V1) of the first resistance and a second voltage (V2) of the second resistance. The computing unit is configured for calculating a value of the internal resistance (Resr) via a following formula: Resr=(V2-V1)/(V1/R1-V2/R2). A related method for measuring the internal resistance of the battery is also provided.

Description

200905947 九、發明說明： 【發明所屬之技術領域】200905947 IX. Description of the invention: [Technical field to which the invention belongs]

=明涉及電池參數的檢測’尤 的測置裝置和方法。 电/ II 【先前技術】 母個電池都有内阻，不 類型的I 门痛型的電池内阻不同，相同 内部化學特性的不-致，内阻也不-樣。 下内Ρ且疋衡置電池性能的—個重要技術指標。正常情況 的一也：1的電池其内部電阻所消耗的電壓較小，内阻大 較大的電墨，可見，在大電流放電 的應用中，一定要選擇内阻較小的電池。 在電池放電的原理上來爷， 開考慮，分為以把電池和内阻拆 小的兩虹。1 i ^又阻的電池串接上—個阻值很 阻上：红4如果外接的負載重，那麼分配在這個小電 阻上的電壓就小，反之如果外 二… 這個小電阻上的電壓就比較大，就2負那麼分配在 在這個内阻卜，就會有—部分功率被消耗 化學反應。一個可充帝带 二设錶的逆向電 缺渦真* 充私私池出廠訏的内阻是比較小的，但 °長功使用後，由於電池内部電解液 内部化學物質活性的降低，内阻會逐=及電池 到電池内部的電量無法正常釋放出來漸二==大 了。可見’電池内阻的大小直接影響 :^又用 能要瞭％,池内阻的大小’以便準確_出電池性 200905947 【發明内容】 有鑒於此，有必要提供一種電池内阻測量裝置。 還有必要提供一種電池内阻測量方法。 一種電池内阻測量裝置，包括： 充/放電單元，用於分別通過第一電阻和第二電阻對電 池進行充/放電； 第一切換開關，用於切換選擇該第一電阻和第二電阻 其中之一來對電池進行充/放電； 檢測早元’用於分別檢測该弟一電阻和弟二電阻兩端 的電壓值； 計算單元，用於根據該第一電阻和第二電阻的阻值， 以及該檢測單元檢測到的電壓值計算出電池内阻的阻值， 計算公式為：Resr = (V2-Vl)/(Vl/Rl-V2/R2)，其中，Resr 表示電池内阻的阻值，R1表示第一電阻的阻值，R2表示 第二電阻的阻值，VI表示第一電阻兩端的電壓值，V2表 示第二電阻兩端的電壓值。 一種電池内阻測量方法，包括如下步驟： 通過第一電阻給電池充/放電，並檢測充/放電時第一 電阻兩端的電屋值。 通過第二電阻給電池充/放電，並檢測充/放電時第二 電阻兩端的電壓值。 根據公式Resr = (V2-Vl)/(Vl/Rl-V2/R2)計算出電池内 阻的阻值，其中，Resr表示電池内阻的阻值，R1表示第一 電阻的阻值，R2表示第二電阻的阻值，VI表示第一電阻 7 200905947 -· 兩端的電壓值，V2表示第二電阻兩端的電壓值。 . 上述電池内阻測量裝置採用第一電阻和第二電阻分別 對電池進行充電或者放電，並檢測其兩端得電壓值，再通 過公式Resr = (V2-Vl)/(Vl/Rl-V2/R2)得出電池内阻的阻 值，以使得用戶可以根據得出電池内阻的阻值來判斷電池 性能的好壞。 【實施方式】 請參閱圖1，為了便於理解，本實施方式中電池20看 ( 作由電池内阻202和理想電池204串聯而成，電池内阻測 量裝置10用於檢測該電池内阻202的阻值大小。 電池内阻測量裝置10包括充電單元102、放電單元 104、第一電阻106、第二電阻108、第一切換開關110、 第二切換開關112、檢測單元114、比較單元116、控制單 元118、計算單元120以及顯示單元122。 充電單元102可分別通過第一電阻106和第二電阻 108對電池20進行充電。 、 放電單元104可分別通過第一電阻106和第二電阻 108為電池提供放電回路。 第一電阻106和第二電阻108並聯於第一切換開關 110和第二切換開關112之間。第一切換開關110還與電 池20連接，用於切換選擇第一電阻106和第二電阻108 其中之一來對電池20進行充電或放電。第二切換開關112 還分別連接於充電單元102和放電單元104，用於切換選 擇充電單元102和放電單元104其中之一來進行充電或者 8 200905947 放電工作。 檢測單元m用於分別檢測第一電阻 108以及電池2〇兩端的電壓值。 弟一電阻 比較單元116用於將#前電池2() 設電壓值比較，產生—個控制訊號，以確定;^與—預 运是放電模式。因為，測量電池内阻2 =模式 式和放電模式兩種，當電…兩：；有充電模 20充電已經奋茗，士 # 丁 枕 弘至毕乂円’即電池 電模式測量較好；若電池 此¥採用放 低，放電能力不強，了〜 笔，其兩端電壓較 所以此時採用充電模式測量較好。 果以增大， 控制單元118用於根據比較單元ιΐ6纟出的 切侧112的切換動作，以及根據檢測；= 、w J 完成來控制第一切換開關i 1〇的切換動作。 計算單Tt 12G用於根據第—電阻1Q6和第二電阻⑽ 的阻值’檢測單兀114檢測到的電壓值計算出電池内阻2〇2 的阻值，具體演异法後面會作詳細說明。顯示單元 於顯示電池内阻202的阻值。 人以下舉例說明電池内阻測量裝置1〇測量工作，首先， 铋測單το 114檢測電池2〇兩端的電壓，再將測得之電池 2〇兩端的電壓與預設電壓值比較，若小於該預設電壓值， 則2過控制單元118控制第二切換開關112切換選擇所述 充电單兀102進行測量工作，反之則通過控制單元118控 制第二切換開關112切換選擇放電單元104進行測量工 200905947 作。以下以充電模式為例，利用控制單元118分別控制第 .一切換開關110依次選擇第一電阻106和第二電阻108， 使得充電單元102分別通過第一電阻106和第二電阻108 對電池20充電一次。此處定義充電電壓為Vc，第一電阻 106的阻值為R1，測得的第一電阻106兩端的電壓為VI， 採用第一電阻106充電時測得的電池20兩端的電壓為 Vtl，第二電阻108的阻值為R2，測得的第二電阻108兩 端的電壓為V2，採用第二電阻108充電時測得的電池20 ， 兩端的電壓為Vt2，電池内阻202的阻值為Resr，理想電 池204的電壓為Vbat，各參數有如下關係：= The device and method for detecting the detection of battery parameters. Electric / II [Prior Art] The mother battery has internal resistance. The internal resistance of the battery of the type I is not the same. The internal chemical characteristics are not the same, and the internal resistance is not the same. It is an important technical indicator for the performance of the battery. The normal situation is also the same: 1 battery has less internal voltage consumption, and the internal resistance is larger. It can be seen that in the application of large current discharge, it is necessary to select a battery with less internal resistance. In the principle of battery discharge, open consideration, divided into two rainbows to remove the battery and internal resistance. 1 i ^ and the resistance of the battery connected in series - a resistance is very resistant: red 4 if the external load is heavy, then the voltage distributed on this small resistance is small, and if the external two ... the voltage on this small resistance It is relatively large, so the 2 negative distribution is in this internal resistance, there will be - part of the power is consumed by the chemical reaction. A reverse electric vortex that can be filled with two sets of watches. The internal resistance of the private pool is relatively small, but after the long work is used, the internal resistance of the internal electrolyte of the battery is reduced. Will be = and the battery to the battery inside the power can not be released normally gradually == large. It can be seen that the size of the internal resistance of the battery directly affects: ^ The amount of energy used in the cell is '%, the size of the internal resistance of the cell' is accurate. _ Battery efficiency 200905947 [Invention] In view of this, it is necessary to provide a battery internal resistance measuring device. It is also necessary to provide a method for measuring the internal resistance of the battery. A battery internal resistance measuring device includes: a charging/discharging unit for charging/discharging a battery through a first resistor and a second resistor; a first switching switch for switching between the first resistor and the second resistor One of charging/discharging the battery; detecting early element 'for detecting the voltage values across the resistor and the second resistor respectively; calculating unit for determining the resistance according to the first resistor and the second resistor, and The voltage value detected by the detecting unit calculates the resistance value of the internal resistance of the battery, and the calculation formula is: Resr = (V2-Vl) / (Vl / Rl - V2 / R2), wherein Resr represents the resistance of the internal resistance of the battery, R1 represents the resistance of the first resistor, R2 represents the resistance of the second resistor, VI represents the voltage value across the first resistor, and V2 represents the voltage across the second resistor. A method for measuring internal resistance of a battery includes the steps of: charging/discharging a battery through a first resistor, and detecting an electric house value at both ends of the first resistor during charging/discharging. The battery is charged/discharged by the second resistor, and the voltage across the second resistor at the time of charging/discharging is detected. Calculate the resistance of the internal resistance of the battery according to the formula Resr = (V2-Vl) / (Vl / Rl - V2 / R2), where Resr represents the resistance of the internal resistance of the battery, R1 represents the resistance of the first resistor, and R2 represents The resistance of the second resistor, VI represents the voltage value of the first resistor 7 200905947 -·, and V2 represents the voltage value across the second resistor. The above battery internal resistance measuring device uses the first resistor and the second resistor to respectively charge or discharge the battery, and detects the voltage value at both ends thereof, and then passes the formula Resr = (V2-Vl)/(Vl/Rl-V2/ R2) The resistance value of the internal resistance of the battery is obtained, so that the user can judge the performance of the battery according to the resistance value of the internal resistance of the battery. [Embodiment] Please refer to FIG. 1. For ease of understanding, in the present embodiment, the battery 20 is viewed as a battery internal resistance 202 and an ideal battery 204. The battery internal resistance measuring device 10 is used to detect the internal resistance 202 of the battery. The battery internal resistance measuring device 10 includes a charging unit 102, a discharging unit 104, a first resistor 106, a second resistor 108, a first switching switch 110, a second switching switch 112, a detecting unit 114, a comparing unit 116, and a control unit. The unit 118, the calculation unit 120 and the display unit 122. The charging unit 102 can charge the battery 20 through the first resistor 106 and the second resistor 108. The discharge unit 104 can be a battery through the first resistor 106 and the second resistor 108, respectively. A discharge circuit is provided. The first resistor 106 and the second resistor 108 are connected in parallel between the first changeover switch 110 and the second changeover switch 112. The first changeover switch 110 is further connected to the battery 20 for switching and selecting the first resistance 106 and the first One of the two resistors 108 charges or discharges the battery 20. The second switch 112 is also connected to the charging unit 102 and the discharging unit 104, respectively, for switching the charging. One of the unit 102 and the discharge unit 104 is used for charging or 8 200905947 discharge operation. The detecting unit m is for detecting the voltage values of the first resistor 108 and the battery 2 分别, respectively. The first resistor-compensation unit 116 is used for the #前电池2 () Set the voltage value comparison, generate a control signal to determine; ^ and - pre-ship is the discharge mode. Because, measure the battery internal resistance 2 = mode and discharge mode, when the electricity ... two:; have charging Mode 20 charging has been frustrated, Shi #丁枕弘到毕乂円' means that the battery electric mode is better measured; if the battery is lowered, the discharge capacity is not strong, and the pen has a voltage at both ends. The charging mode is better measured. If it is increased, the control unit 118 is configured to control the switching of the first switching switch i 1〇 according to the switching action of the tangent side 112 extracted by the comparing unit ι 6 and according to the detection; =, w J completion. The calculation single Tt 12G is used to calculate the resistance of the battery internal resistance 2〇2 according to the voltage value detected by the resistance value of the first resistance 1Q6 and the second resistance (10), and the specific resistance method will be followed. Detailed The display unit displays the resistance of the battery internal resistance 202. The following is an example of the battery internal resistance measuring device 1 〇 measurement work, first, the test single το 114 detects the voltage across the battery 2 ,, and then the measured battery 2 The voltage across the 〇 is compared with the preset voltage value. If the voltage is less than the preset voltage value, the 2 control unit 118 controls the second switch 112 to switch to select the charging unit 102 for measurement, and vice versa. The second changeover switch 112 switches the selection discharge unit 104 to perform the measurement work 200905947. Taking the charging mode as an example, the control unit 118 controls the first switching switch 110 to sequentially select the first resistor 106 and the second resistor 108, so that the charging unit 102 charges the battery 20 through the first resistor 106 and the second resistor 108, respectively. once. Here, the charging voltage is defined as Vc, the resistance of the first resistor 106 is R1, the measured voltage across the first resistor 106 is VI, and the voltage across the battery 20 measured by the first resistor 106 is Vtl, The resistance of the two resistors 108 is R2, and the measured voltage across the second resistor 108 is V2. When the second resistor 108 is charged, the voltage of the battery 20 is Vt2, and the resistance of the battery internal resistance 202 is Resr. The voltage of the ideal battery 204 is Vbat, and the parameters have the following relationship:

Vtl=Vbat + Resr(Vl/Rl)Vtl=Vbat + Resr(Vl/Rl)

Vt2 = Vbat + Resr(V2/R2)Vt2 = Vbat + Resr(V2/R2)

Vtl + Vl=Vc Vt2 + V2 = Vc 根據上述公式可得：Vtl + Vl=Vc Vt2 + V2 = Vc According to the above formula:

Vbat + Resr(Vl/Rl) + Vl=Vbat + Resr(V2/R2) + V2 s Resr = (V2-Vl)/(Vl/Rl-V2/R2) 其中，因為VI、V2、R1、R2都為已知數，所以可得 到電池内阻202的阻值Resr。還可以看出，這樣的計算方 法得到的是電池内阻202的阻值Resr與第一電阻106和第 二電阻108的阻值Rl、R2以及其兩端的電壓值VI 、V2 的關係，跟充電電壓Vc以及電池20兩端的電壓Vtl沒有 關係。如此，若採用放電單元104進行測量工作也同樣適 用上述演算法，以得到電池内阻202的阻值Resr。 10 200905947 上述電池内阻測量裝置10在測量前先根據電池20當 前的電壓狀況選擇合適的測量方式，使得測得之電池内阻 202的阻值Resr更準確。另外，電池内阻測量裝置10採 用第一電阻106和第二電阻108分別對電池20進行充電或 者放電，並檢測其兩端得電壓值，再通過公式 Resr = (V2-Vl)/(Vl/Rl-V2/R2)得出電池内阻202的阻值並 顯示，用戶可以根據得出電池内阻202的阻值來判斷電池 20性能的好壞。 一種電池内阻測量方法包括如下步驟： 步驟S31，檢測電池20兩端的電壓值。 步驟S33，判斷電池20兩端的電壓值是否小於預設電 壓值，若是，則進至步驟S35，否則進至步驟S43。 步驟S35，通過第一電阻106 (電阻值為R1 )給電池 20充電，並檢測充電時第一電阻106兩端的電壓值VI。 步驟S37，通過第二電阻108 (電阻值為R2)給電池 20充電，並檢測充電時第二電阻108兩端的電壓值V2。 步驟 S39,根據公式 Resr = (V2-Vl)/(Vl/Rl-V2/R2)計 算出電池内阻202的阻值Resr。 步驟S41，顯示電池内阻值Resr，流程結束。 步驟S43，通過第一電阻106 (電阻值為R1)給電池 20放電，並檢測充電時第一電阻106兩端的電壓值VI。 步驟S45，通過第二電阻108 (電阻值為R2)給電池 20放電，並檢測充電時第二電阻108兩端的電壓值V2， 然後回到步驟S39。 11 200905947 上述電池内阻測量方法在測量前先根據電池20當前 的電壓狀況選擇合適的測量方式，使得測得之電池内阻 202的阻值Resr更準確。另外，電池内阻測量裝置10採 用第一電阻106和第二電阻108分別對電池20進行充電或 者放電’並檢測其兩端付電遥值’再通過公式 Resr = (V2-Vl)/(Vl/Rl-V2/R2)得出電池内阻202的阻值並 顯示，用戶可以根據得出電池内阻202的阻值來判斷電池 20性能的好壞。 【圖式簡單說明】 圖1為一較佳實施方式的電池内阻測量裝置架構圖。 圖2為一較佳實施方式的電池内阻測量方法流程圖。 【主要元件符號說明】 電池内阻測量裝置 10 檢測單元 114 電池 20 比較單元 116 充電單元 102 控制單元 118 放電單元 104 計算單元 120 第一電阻 106 顯示單元 122 第二電阻 108 電池内阻 202 第一切換開關 110 理想電池 204 第二切換開關 112 電池内阻測量方法流程 S31-S45 12Vbat + Resr(Vl/Rl) + Vl=Vbat + Resr(V2/R2) + V2 s Resr = (V2-Vl)/(Vl/Rl-V2/R2) where, because VI, V2, R1, R2 Since the number is known, the resistance Resr of the battery internal resistance 202 can be obtained. It can also be seen that such a calculation method obtains the relationship between the resistance Resr of the battery internal resistance 202 and the resistance values R1 and R2 of the first resistor 106 and the second resistor 108, and the voltage values VI and V2 at both ends thereof, and charging. The voltage Vc and the voltage Vtl across the battery 20 do not matter. Thus, if the discharge unit 104 is used for the measurement operation, the above algorithm is also applied to obtain the resistance Resr of the battery internal resistance 202. 10 200905947 The above battery internal resistance measuring device 10 selects an appropriate measuring method according to the current voltage condition of the battery 20 before the measurement, so that the measured resistance Resr of the battery internal resistance 202 is more accurate. In addition, the battery internal resistance measuring device 10 uses the first resistor 106 and the second resistor 108 to respectively charge or discharge the battery 20, and detects the voltage values at both ends thereof, and then passes the formula Resr = (V2-Vl)/(Vl/ Rl-V2/R2) obtains the resistance value of the battery internal resistance 202 and shows that the user can judge the performance of the battery 20 according to the resistance value of the battery internal resistance 202. A battery internal resistance measuring method includes the following steps: Step S31, detecting a voltage value across the battery 20. In step S33, it is judged whether the voltage value across the battery 20 is less than the preset voltage value, and if so, the process goes to step S35, otherwise to step S43. In step S35, the battery 20 is charged by the first resistor 106 (resistance value R1), and the voltage value VI across the first resistor 106 during charging is detected. In step S37, the battery 20 is charged by the second resistor 108 (resistance value R2), and the voltage value V2 across the second resistor 108 during charging is detected. In step S39, the resistance value Resr of the battery internal resistance 202 is calculated according to the formula Resr = (V2-Vl) / (Vl / Rl - V2 / R2). In step S41, the internal resistance value Resr of the battery is displayed, and the flow ends. In step S43, the battery 20 is discharged through the first resistor 106 (resistance value R1), and the voltage value VI across the first resistor 106 during charging is detected. In step S45, the battery 20 is discharged through the second resistor 108 (resistance value R2), and the voltage value V2 across the second resistor 108 during charging is detected, and then returns to step S39. 11 200905947 The above battery internal resistance measurement method selects an appropriate measurement method according to the current voltage condition of the battery 20 before measurement, so that the measured resistance Resr of the battery internal resistance 202 is more accurate. In addition, the battery internal resistance measuring device 10 uses the first resistor 106 and the second resistor 108 to respectively charge or discharge the battery 20 and detect the teleelectric value of both ends thereof, and then passes the formula Resr = (V2-Vl)/(Vl /Rl-V2/R2) The resistance value of the battery internal resistance 202 is obtained and displayed, and the user can judge the performance of the battery 20 based on the resistance value of the battery internal resistance 202. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural diagram of a battery internal resistance measuring device according to a preferred embodiment. 2 is a flow chart of a method for measuring internal resistance of a battery according to a preferred embodiment. [Main component symbol description] Battery internal resistance measuring device 10 Detection unit 114 Battery 20 Comparison unit 116 Charging unit 102 Control unit 118 Discharge unit 104 Calculation unit 120 First resistor 106 Display unit 122 Second resistor 108 Battery internal resistance 202 First switching Switch 110 ideal battery 204 second switch 112 battery internal resistance measurement method flow S31-S45 12

Claims (1)

200905947 十、申請專利範圍 1. 一種電池内阻測量裝置，其特徵在於，該電池内阻測量 裝置包括： 充電單元，用於分別通過第一電阻和第二電阻對電池進 行充電； 第一切換開關，用於切換選擇該第一電阻和第二電阻其 中之一來對電池進行充電； 檢測早元’用於分別檢測該弟一電阻和弟二電阻兩端的 電壓值； 計算單元，用於根據該第一電阻和第二電阻的阻值，以 及該檢測單元檢測到的電壓值計算出電池内阻的阻 值，計算公式為：Resr = (V2-Vl)/(Vl/Rl-V2/R2)，其中， Re sr表示電池内阻的阻值，R1表示第一電阻的阻值，R2 表示第二電阻的阻值，VI表示第一電阻兩端的電壓值， V2表示第二電阻兩端的電壓值。 2. 如申請專利範圍第1項所述之電池内阻測量裝置，其中 該充電單元、第一電阻以及第一切換開關依次串聯，該 第二電阻與第一電阻並聯，該檢測單元與該第二電阻與 第一電阻兩端相連，該計算單元與檢測單元相連。 3. 如申請專利範圍第2項所述之電池内阻測量裝置，其中 該電池内阻測量裝置還包括：放電單元和第二切換開 關，該充電單元和放電單元分別通過第二切換開關與該 第一電阻和第二電阻相連，該放電單元用於分別通過該 第一電阻和第二電阻為電池提供放電回路；該第二切換 13 200905947 開關用於切換選擇該充電單元 對電池進行充電或放電工作。 H、中之-來 4.如申請專利範圍第3項所述之電池内 該檢測單元進—步用 里破置，其中 内阻測量裝置還包括：：較：也兩:的電壓值，該電池 元連接於該檢測單元和= 該比較單 第二切換開關相連，該檢測單元進一牛用二制早凡與該 :的電壓值，該比較單元用於將該電：端 =:=出產生，制訊號心 換動作，當該電池：：控二第二切㈣ 二切換開關選擇該充電單元工作广電堡值，该弟 元工作。 兄…工作，反之則選擇該放電單 5 I:二專利範圍第3項所述之電池内阻測量裝置，其中 :工1早錢―步與該第—切換開關相連，用Μ攄1 ::單―否完成來控制第-4 = I::，範:第1項所述之電池内阻測量裝置，其中 ㈣第ΓΓ日換為放電單元，該放電單元用於分別通 7 電阻和第二電阻為電池提供放電回路。 種電池内阻翊量方法，包括如下步驟： =電以及充電單元依次串聯，通過該第-值；絲而充電％該弟一電阻兩端的電塵 14 200905947 將電池、第二電阻以及充電單元依次串聯，通過第二電 阻給電池充電，並檢測充電時該第二電阻兩端電壓值； 根據公式Resr = (V2-Vl)/(Vl/Rl-V2/R2)計算出電池内阻 的阻值，其中，Re sr表示電池内阻的阻值，R1表示第一 電阻的阻值，R2表示第二電阻的阻值，VI表示第一電 阻兩端的電壓值，V2表示第二電阻兩端電壓值。 8. 如申請專利範圍第7項所述之電池内阻測量方法，其中 進一步包括如下步驟： 檢測該電池兩端的電壓值； 判斷該電池兩端的電壓值是否小於預設電壓值，若是， 跳到該通過第一電阻給電池充電，並檢測充電時第一電 阻兩端的電壓值的步驟； 若不是，進至如下步驟：將該電池、第一電阻以及放電 早元依次串聯，通過該第·一電阻給該電池放電’並檢測 充電時該第一電阻兩端的電壓值； 將該電池、第一電阻以及放電單元依次串聯，通過該第 二電阻給該電池放電，並檢測充電時該第二電阻兩端的 電壓值，然後根據公式Resr = (V2-Vl)/(Vl/Rl-V2/R2)計 算出電池内阻的阻值。 9. 如申請專利範圍第7項所述之電池内阻測量方法，其中 進一步包括顯示該電池内阻值Re sr的步驟。 10. 如申請專利範圍第7項所述之電池内阻測量方法，其中 將該步驟中的充電單元替換為放電單元，並將充電動作 替換為放電動作。 15200905947 X. Patent application scope 1. A battery internal resistance measuring device, characterized in that: the battery internal resistance measuring device comprises: a charging unit, configured to respectively charge a battery through a first resistor and a second resistor; And switching for selecting one of the first resistor and the second resistor to charge the battery; detecting the early element 'for respectively detecting a voltage value across the resistor and the second resistor; the calculating unit, according to the The resistance values of the first resistor and the second resistor, and the voltage value detected by the detecting unit calculate the resistance value of the internal resistance of the battery, and the calculation formula is: Resr = (V2-Vl) / (Vl / Rl - V2 / R2) Where Re sr represents the resistance of the internal resistance of the battery, R1 represents the resistance of the first resistor, R2 represents the resistance of the second resistor, VI represents the voltage value across the first resistor, and V2 represents the voltage value across the second resistor. . 2. The battery internal resistance measuring device according to claim 1, wherein the charging unit, the first resistor and the first switching switch are connected in series, the second resistor is connected in parallel with the first resistor, and the detecting unit and the first The two resistors are connected to both ends of the first resistor, and the calculation unit is connected to the detecting unit. 3. The battery internal resistance measuring device according to claim 2, wherein the battery internal resistance measuring device further comprises: a discharge unit and a second switching switch, wherein the charging unit and the discharging unit respectively pass the second switching switch The first resistor is connected to the second resistor, and the discharge unit is configured to provide a discharge circuit for the battery through the first resistor and the second resistor respectively; the second switch 13 200905947 switch is used for switching to select the charging unit to charge or discharge the battery jobs. H, 中之-到4. In the battery described in claim 3, the detecting unit is further broken in the step, wherein the internal resistance measuring device further comprises: a voltage value of: two: The battery unit is connected to the detecting unit and is connected to the comparison single second switching switch, and the detecting unit is used to input a voltage value of the second unit, and the comparing unit is configured to generate the electric: terminal=:= , the signal heart change action, when the battery:: control two second cut (four) two switch to select the charging unit to work Guangfa Fort, the disco work. Brother... work, and vice versa, select the discharge single 5 I: the battery internal resistance measuring device described in item 3 of the second patent scope, wherein: the labor 1 early money step is connected with the first switching switch, using Μ摅1 :: Single-no-complete to control the -4::, Fan: The battery internal resistance measuring device described in item 1, wherein (4) the next day is replaced by a discharge unit, which is used to respectively pass 7 resistors and second The resistor provides a discharge loop for the battery. The method for measuring the internal resistance of the battery comprises the following steps: = the electric and charging units are connected in series, through the first value; the wire is charged, and the electric dust at both ends of the resistor is 14200905947, the battery, the second resistor and the charging unit are sequentially In series, charging the battery through the second resistor, and detecting the voltage value of the second resistor during charging; calculating the resistance of the internal resistance of the battery according to the formula Resr = (V2-Vl) / (Vl / Rl - V2 / R2) Where Re sr represents the resistance of the internal resistance of the battery, R1 represents the resistance of the first resistor, R2 represents the resistance of the second resistor, VI represents the voltage value across the first resistor, and V2 represents the voltage across the second resistor. . 8. The method for measuring internal resistance of a battery according to claim 7, further comprising the steps of: detecting a voltage value at both ends of the battery; determining whether a voltage value at both ends of the battery is less than a preset voltage value, and if so, jumping to The step of charging the battery through the first resistor and detecting the voltage value across the first resistor during charging; if not, proceeding to the step of: sequentially connecting the battery, the first resistor, and the discharge early element in series, through the first The resistor discharges the battery' and detects a voltage value across the first resistor during charging; the battery, the first resistor, and the discharge unit are sequentially connected in series, the battery is discharged through the second resistor, and the second resistor is detected during charging The voltage value at both ends is then calculated according to the formula Resr = (V2-Vl) / (Vl / Rl - V2 / R2). 9. The battery internal resistance measuring method according to claim 7, further comprising the step of displaying the internal resistance value Re sr of the battery. 10. The battery internal resistance measuring method according to claim 7, wherein the charging unit in the step is replaced with a discharging unit, and the charging operation is replaced with a discharging operation. 15
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