201206006 六、發明說明： 【發明所屬之技術領域】 本揭示内容是有關於充電之裝置，且特 一種充電電池之充電裝置。 有關於 【先前技術】 電池在現今社會是非常普遍的電能儲存裝 料科技的進步，不斷的開發新型電池。現今 由於材 鐵電池較傳統的二次電池有重量輕、電容 *用的鋰201206006 VI. Description of the Invention: [Technical Field of the Invention] The present disclosure relates to a device for charging, and a charging device for a rechargeable battery. [Previous Technology] Batteries are a very common advancement in electrical energy storage technology in today's society, and new batteries are constantly being developed. Today, the iron battery is lighter than the conventional secondary battery, and the capacitor is used.
Si,可容許較大電流充放電’且無記憶效應，無論殘 存電1多少，皆可隨時充電，不會影響電容量，其壽命亦 較長。然而，鋰鐵電池可大電流充放電的特性，使得串聯 使用中的鐘鐵電池的各個單電壓更不容易平衡。 對於每一個電池組來說，每個電池的特性、内阻不可 能完全一致，即使經過非常嚴謹的製程也不可能相同，再 加上使用的歷程及老化的速度不同’其内阻的差显勢必存 在，且差異可能越來越大。故在充放電的過程中，、有些電 放電的速度較快，造成部份電池率先到達過ί或 失奋始^制而終止充電或放電的動作，但其餘電池可能尚 有充足的電力可供應。電池電壓不平衡造成電 率與2電壓差距過大’將嚴重影響整個電池組的供電效 【發明内容】Si can withstand a large current charge and discharge' and has no memory effect. It can be charged at any time regardless of the amount of residual power, and it does not affect the capacitance, and its life is longer. However, the lithium iron battery can be charged and discharged with a large current, so that the individual voltages of the clock iron batteries used in series are less likely to be balanced. For each battery pack, the characteristics and internal resistance of each battery may not be exactly the same, even after a very strict process, it is impossible to be the same, plus the history of use and the speed of aging are different. It is bound to exist, and the difference may be getting bigger and bigger. Therefore, in the process of charging and discharging, some electric discharges are faster, causing some batteries to reach the first or the end of the system and terminate the charging or discharging action, but the remaining batteries may still have sufficient power to supply. . The battery voltage imbalance causes the power to be too far from the voltage of 2, which will seriously affect the power supply efficiency of the entire battery pack.
iSI 因此，本揭不内容之一技術態樣在於提供一種電池組 4 201206006 充電平衡系統，以克服上述電池電壓不平衡的問題。 依據本揭示内容一實施方式，一種電池組充電平衡系 統包含一電池組、一電壓量測電路、一被平衡電池選擇電 路、一充電電源及一平衡電源。電池組包含多數個電池及 量測端點。電池彼此串聯相接。量測端點位於每一個電池 的兩側。電壓量測電路與電池組之量測端點電性連接，用 以量測電池組之電池的電壓。被平衡電池選擇電路與電池 組連接，用以選擇電壓最低之電池組之電池。被平衡電池 選擇電路包含多數個切換開關及一控制器。多數個切換開 關與電池組之電池連接，且每一電池皆與兩個切換開關相 連。控制器根據電壓量測電路之結果，開啟電池組内對應 同一電池之兩個切換開關。充電電源與電池組串聯相接。 平衡電源與被平衡電池選擇電路連接，透過被平衡電池選 擇電路之控制器開啟的切換開關，對一特定電池進行平衡 充電。 依據上述一實施方式之電池組充電平衡系統更包含一 人機介面，與被平衡電池選擇電路之控制器訊號連接。 依據上述一實施方式之電池組充電平衡系統其中電池 組之電池為鋰鐵電池。 依據上述一實施方式之電池組充電平衡系統其中被平 衡電池選擇電路之切換開關為繼電器。 依據上述一實施方式之電池組充電平衡系統更包含一 RS-485通訊介面，分別與電壓量測電路及控制器相連。 依據本揭示内容另一實施方式，一種電池组充電平衡 系統包含一充電電源、一電壓量測電路、一控制器、一被 201206006 平衡電池選擇電路及一平衡電源。充電電源與電池組串 聯。電壓量測電路分別與電池組内各個電池相連，用以量 測各個電池的電壓。控制器與電壓量測電路相連，根據^ 壓量測電路之量測結果，找出電池組内具一最小電壓電 池。被平衡電池選擇電路與控制器相連，被平衡電池選擇 電路具有多數個切換開關，且相對應最小電壓電池之切換 開關受控於控制器開啟。平衡電源與被平衡電池選擇電路 相連，平衡電源透過控制器開啟之切換開關，對最 Φ 電池進行平衡充電。 依據上述另一實施方式之電池組充電平衡系統更包含 一人機介面，與被平衡電池選擇電路之控制器訊號連接。 依據上述另一實施方式之電池組充電平衡系統其中電 池組之電池為鋰鐵電池。 依據上述另一實施方式之電池組充電平衡系統其中被 平衡電池選擇電路之切換開關為繼電器。 依據上述另一實施方式之電池組充電平衡系統更包含 # 一 RS-485通訊介面，分別與電壓量測電路及控制器相連。 因此，本揭示内容之電池組充電平衡系統利用平衡電 源配合被平衡電池選擇電路，針對充電過程中電壓落後的 電池加強充電，不僅可縮短整體電池組充電的時間，亦可 使電池組内各個電池達到最佳的充電狀態，更能延長電池 組的使用壽命。 【實施方式】 第1圖綠示本揭示内容一實施方式之電池組充電平衡 201206006 系統的示意圖。如圖所示，電池組充電平衡系統包含一電 池組100、一電壓量測電路200、一被平衡電池選擇電路 300、一充電電源400及一平衡電源500。本實施方式在利 用充電電源400對電池組100充電的同時，亦使用被平衡 電池選擇電路300配合平衡電源500快速執行每個電池電 壓等值化的平衡任務。當電池組100充電完成時，各個電 池電壓也處於平衡狀態。 電池組100包含多個電池及多個量測端點，在本實施 方式中，電池組100包含8個電池B1-B8及9個量測端點 110-190。電池B1-B8彼此串聯相接，此外，每一個電池的 兩側皆有一個量測端點。 第2圖繪示第1圖之被平衡電池選擇電路中電壓量測 電路的示意圖。電壓量測電路200分別與電池組100内各 個電池之量測端點110-190電性連接，用以量測各個電池 的電壓。在本實施方式採用 >弘格科技生產的電壓模組 M-7017來量測每個電池的電壓，M-7017可一次同時量測8 組電壓值，輸入範圍有 +/-150mV、+/-500mV、+/-1V、+/-5V、 +/-10V供使用者選擇。 第3A圖繪示第1圖之被平衡電池選擇電路中多數個 切換開關的示意圖。被平衡電池選擇電路300與電池組100 連接。其中，被平衡電池選擇電路300包含多數個切換開 關 310a-317a、310b-317b 及一控制器 320。 第3B圖繪示第1圖之被平衡電池選擇電路中控制器的 示意圖。多數個切換開關310a-317a、310b-317b與電池組 201206006 100之電池B1-B8連接，且每一個電池皆與兩個切換開關 相連。如電池B1與切換開關31〇a及M〇b相連。各電池對 應之切換開關如下表一: 電池 B1 B2 B3 B4 B5 B6 B7 B8 切換 310a 311a 312a 313a 314a 315a 316a 317a 開關 310b 311b 312b 313b 314b 315b 316b 317b 表一 控制器330各個腳位分別對應到各個切換開關，如腳 籲位DOO對應到切換開關310a。各腳位對應之切換開關如下 表二： 腳位 DOO DOl D02 D03 D04 D05 D06 D07 切換 開關 310a 310b 311a 311b 312a 312b 313a 313b 腳位 D08 D09 DO10 DOll D012 D013 D014 D015 切換 開關 314a 314b 315a 315b 316a 316b 317a 317b 表二 控制器320的各腳位與切換開關相連’可分別控制各 個切換開關之啟閉。另一方面，控制器320與電壓量測電 路200相連，根據電壓量測電路200的結果，找出電池組 100内具一最小電壓電池’並開啟電池組100内對應同一 電池之兩個切換開關。 值得一提的是，本實施方式使用RS-485通訊介面 330，分別與電壓量測電路200及控制器320相連’並以 201206006iSI Therefore, one of the technical aspects of the present disclosure is to provide a battery pack 4 201206006 charge balancing system to overcome the above-mentioned battery voltage imbalance problem. According to an embodiment of the present disclosure, a battery pack charging balance system includes a battery pack, a voltage measuring circuit, a balanced battery selecting circuit, a charging power source, and a balanced power source. The battery pack contains a number of batteries and measurement endpoints. The batteries are connected in series with each other. The measurement endpoints are located on either side of each battery. The voltage measuring circuit is electrically connected to the measuring end of the battery pack for measuring the voltage of the battery of the battery pack. The balanced battery selection circuit is connected to the battery pack to select the battery of the battery pack having the lowest voltage. The balanced battery selection circuit includes a plurality of switching switches and a controller. Most of the switch switches are connected to the battery of the battery pack, and each battery is connected to two switch switches. The controller turns on the two switches corresponding to the same battery in the battery pack according to the result of the voltage measuring circuit. The charging power source is connected in series with the battery pack. The balanced power supply is connected to the balanced battery selection circuit, and a specific battery is balancedly charged through a switch that is turned on by the controller of the balanced battery selection circuit. The battery pack charging balance system according to the above embodiment further includes a human machine interface connected to the controller signal of the balanced battery selection circuit. According to the battery pack charging balance system of the above embodiment, the battery of the battery pack is a lithium iron battery. According to the battery pack charging balance system of the above embodiment, the switching switch of the balanced battery selection circuit is a relay. The battery pack charging balance system according to the above embodiment further includes an RS-485 communication interface, which is respectively connected to the voltage measuring circuit and the controller. According to another embodiment of the present disclosure, a battery pack charging balance system includes a charging power source, a voltage measuring circuit, a controller, a 201206006 balanced battery selection circuit, and a balanced power supply. The charging power source is connected in series with the battery pack. The voltage measuring circuit is connected to each battery in the battery pack to measure the voltage of each battery. The controller is connected to the voltage measuring circuit, and according to the measurement result of the voltage measuring circuit, it is found that the battery pack has a minimum voltage battery. The balanced battery selection circuit is connected to the controller, and the balanced battery selection circuit has a plurality of switching switches, and the switching switch corresponding to the minimum voltage battery is controlled by the controller being turned on. The balanced power supply is connected to the balanced battery selection circuit, and the balanced power supply is balanced and charged by the switch that is turned on by the controller. The battery pack balancing system according to another embodiment of the present invention further includes a human machine interface connected to the controller signal of the balanced battery selection circuit. According to another embodiment of the battery pack charging balance system of the above, the battery of the battery pack is a lithium iron battery. According to another embodiment of the battery pack charging balance system described above, the switching switch of the balanced battery selection circuit is a relay. The battery pack charging balance system according to the above another embodiment further includes a #1 RS-485 communication interface, which is respectively connected to the voltage measuring circuit and the controller. Therefore, the battery pack charging balance system of the present disclosure utilizes a balanced power supply and a balanced battery selection circuit to enhance charging of a battery with a backward voltage during charging, which not only shortens the charging time of the entire battery pack, but also enables each battery in the battery pack. To achieve the best state of charge, it can extend the life of the battery pack. [Embodiment] FIG. 1 is a schematic diagram showing a battery pack charging balance according to an embodiment of the present disclosure 201206006. As shown, the battery pack balancing system includes a battery pack 100, a voltage measuring circuit 200, a balanced battery selection circuit 300, a charging power source 400, and a balanced power source 500. In the present embodiment, while the battery pack 100 is being charged by the charging power source 400, the balanced task of the battery voltage equalization is quickly performed by the balanced battery selection circuit 300 in conjunction with the balanced power supply 500. When the battery pack 100 is fully charged, the individual battery voltages are also in equilibrium. The battery pack 100 includes a plurality of batteries and a plurality of measurement endpoints. In the present embodiment, the battery pack 100 includes eight batteries B1-B8 and nine measurement endpoints 110-190. The batteries B1-B8 are connected in series with each other, and in addition, each of the batteries has a measuring end on both sides. Fig. 2 is a view showing a voltage measuring circuit in the balanced battery selection circuit of Fig. 1. The voltage measuring circuit 200 is electrically connected to the measuring terminals 110-190 of each battery in the battery pack 100 for measuring the voltage of each battery. In this embodiment, the voltage of each battery is measured by the voltage module M-7017 produced by Hongge Technology. The M-7017 can measure 8 sets of voltage values at the same time, and the input range is +/-150mV, +/. -500mV, +/-1V, +/-5V, +/-10V for users to choose. Fig. 3A is a schematic view showing a plurality of switching switches in the balanced battery selection circuit of Fig. 1. The balanced battery selection circuit 300 is connected to the battery pack 100. The balanced battery selection circuit 300 includes a plurality of switching switches 310a-317a, 310b-317b and a controller 320. Fig. 3B is a schematic view showing the controller in the balanced battery selection circuit of Fig. 1. A plurality of changeover switches 310a-317a, 310b-317b are connected to the batteries B1-B8 of the battery pack 201206006 100, and each of the batteries is connected to the two changeover switches. For example, the battery B1 is connected to the changeover switches 31A and M〇b. The switch corresponding to each battery is as follows: Battery B1 B2 B3 B4 B5 B6 B7 B8 Switch 310a 311a 312a 313a 314a 315a 316a 317a Switch 310b 311b 312b 313b 314b 315b 316b 317b Table 1 Controller 330 each pin corresponds to each switch The switch, such as the foot command DOO, corresponds to the changeover switch 310a. The switch corresponding to each pin is as shown in Table 2: DOO DOl D02 D03 D04 D05 D06 D07 DIP switch 310a 310b 311a 311b 312a 312b 313a 313b Pin D08 D09 DO10 DO11 D012 D013 D014 D015 DIP switch 314a 314b 315a 315b 316a 316b 317a 317b Table 2: Each pin of the controller 320 is connected to the switch, and the opening and closing of each switch can be separately controlled. On the other hand, the controller 320 is connected to the voltage measuring circuit 200, and according to the result of the voltage measuring circuit 200, finds a minimum voltage battery in the battery pack 100 and turns on two switches corresponding to the same battery in the battery pack 100. . It is worth mentioning that the present embodiment uses the RS-485 communication interface 330, which is connected to the voltage measurement circuit 200 and the controller 320 respectively, and is 201206006
Modbus為通訊協定。透過電壓量測電路200量測出電壓 後，將資料經RS-485通訊介面330傳輸至控制器320，幫 助控制器320找出電池組100内具一最小電壓電池，並開 啟電池組100内對應同一電池之兩個切換開關。 充電電源400與電池組100串聯相接，為電池組100 最主要的充電來源。 平衡電源500與被平衡電池選擇電路300連接，透過 控制器320開啟的切換開關，對一特定電池進行平衡充電。 第4圖繪示第1圖之電池組充電平衡系統的舉例示意 圖。本實施方式採用16個繼電器作為切換開關310a-317a、 310b-317b及泓格科技生產的DO模組M-7045來進行繼電 器ΟΝ/OFF的控制。此電路同一時間只需切換兩個繼電器 就能對特定的電池進行充電，若不對任何電池進行充電 時，只需將全部的繼電器切離即可，此電路使用3.5 mm2 的絞線作為線路的線材，其耐流可達20A。以對電池B3 進行平衡充電為例，充電電源400流過電池組100的電流 為I!，欲對電池B3進行平衡時，需使切換開關312a、312b 的狀態為ON，使平衡電源500的電流12流過電池B3，如 此一來，流過電池B3的總電流為ΙβΙ2，而流過其餘電池 的電流仍為Ιι，在充電電源400及平衡電源500的配合下， 可加速電池組100的充電作業，並減少不必要的時間浪費。 第5圖繪示第1圖之電池組充電平衡系統的流程圖。 在開始進行充電之前，需先透過軟體來進行各項數據的設 定600，如過充電壓、待測電池數、電池的預設壓差 (Vmax-Vmin)、預設壓值、電源供應器的電壓與電流的設定… 201206006 等。啟動充電電源開始充電610之後，量測各電池的電壓 值620，利用控制器找出電池組中最大電壓及最小電壓的 電池630，並開啟對應於最小電壓電池的切換開關640，讓 平衡電源可對最小電壓電池進行平衡充電650。接著，檢 測最小電壓與最大電壓電池之電壓差是否小於預設壓差 660，若否，則繼續對最小電壓電池進行平衡充電650，若 是’則停止平衡充電670。此時，需判斷最大電壓是否大 於預設電壓值680，若否，則重回量測各電池電壓620的 φ 步驟，循環不斷’若是，則停止充電690。 除此之外’本實施方式更包含一人機介面7〇〇,與被 平衡電池選擇電路300的控制器320訊號連接。第6圖繪 示第1圖之電池組充電平衡系統的監控晝面。本實施方式 使用LabVIEW人機開發軟體開發出一套監控電池組1〇〇 即時狀態的軟體。如第6圖所示，上面顯示了 8個柱狀圖， 柱狀圖會隨著各電池的電壓不同而變化，由柱狀圖可清楚 看到各個電池的電壓是否異常。畫面右邊顯示電池組1〇〇 • 最初的狀態及即時的狀態，並隨時監控電池的變化。下面 則標示了充電電源400及平衡電源500的輸出電壓、電流 與功率。電池組100的各項狀態顯示在人機介面7〇〇上： 如此一來即可隨時注意電池組100的充電狀態。 第7圖繪示第1圖之電池組充電平衡系統的電壓趙勢 圖。為了理解電池組⑽的充·況，本實施方尤亦將充Modbus is a communication protocol. After the voltage is measured by the voltage measuring circuit 200, the data is transmitted to the controller 320 via the RS-485 communication interface 330, and the controller 320 is configured to find a minimum voltage battery in the battery pack 100, and open the corresponding battery pack 100. Two toggle switches for the same battery. The charging power source 400 is connected in series with the battery pack 100 and is the most important source of charging for the battery pack 100. The balanced power supply 500 is connected to the balanced battery selection circuit 300, and is balancedly charged by a switching switch that is turned on by the controller 320. Fig. 4 is a view showing an example of the battery pack charging balance system of Fig. 1. In the present embodiment, 16 relays are used as the changeover switches 310a-317a, 310b-317b and the DO module M-7045 manufactured by ICP DAS to perform relay ΟΝ/OFF control. This circuit can charge a specific battery by switching two relays at the same time. If you do not charge any battery, you only need to cut off all the relays. This circuit uses 3.5 mm2 stranded wire as the wire of the line. It can withstand up to 20A. Taking the battery B3 as a balanced charging as an example, the current flowing through the battery pack 100 by the charging power source 400 is I!. To balance the battery B3, the state of the switching switches 312a and 312b is turned ON to balance the current of the power supply 500. 12 flows through the battery B3, so that the total current flowing through the battery B3 is ΙβΙ2, and the current flowing through the remaining batteries is still Ιι, and the charging of the battery pack 100 can be accelerated by the cooperation of the charging power source 400 and the balanced power source 500. Work and reduce unnecessary time wastage. Figure 5 is a flow chart showing the battery pack charging balance system of Figure 1. Before starting to charge, you need to set the data 600 through the software, such as overcharge voltage, number of batteries to be tested, battery preset pressure difference (Vmax-Vmin), preset pressure value, power supply Voltage and current settings... 201206006 and so on. After the charging power source is started to start charging 610, the voltage value 620 of each battery is measured, the battery 630 of the maximum voltage and the minimum voltage in the battery group is found by the controller, and the switching switch 640 corresponding to the minimum voltage battery is turned on, so that the balanced power supply can be The minimum voltage battery is balancedly charged 650. Next, it is detected whether the voltage difference between the minimum voltage and the maximum voltage battery is less than the preset differential pressure 660. If not, the minimum voltage battery is continuously charged 650, and if yes, the balanced charging 670 is stopped. At this time, it is necessary to judge whether the maximum voltage is greater than the preset voltage value 680, and if not, return to the φ step of measuring each battery voltage 620, and if it is, stop charging 690. In addition to this, the present embodiment further includes a human interface 7A, which is connected to the controller 320 of the balanced battery selection circuit 300. Figure 6 is a diagram showing the monitoring surface of the battery pack charging balance system of Figure 1. This embodiment uses the LabVIEW human-machine development software to develop a software that monitors the battery pack's status. As shown in Fig. 6, the above shows eight histograms. The histogram changes with the voltage of each battery. It is clear from the histogram whether the voltage of each battery is abnormal. The right side of the screen shows the battery pack 1〇〇 • Initial status and immediate status, and monitor battery changes at any time. The output voltage, current and power of the charging power source 400 and the balanced power source 500 are indicated below. The states of the battery pack 100 are displayed on the human machine interface 7: so that the state of charge of the battery pack 100 can be noted at any time. Figure 7 is a diagram showing the voltage potential of the battery pack charging balance system of Figure 1. In order to understand the charging status of the battery pack (10), the present embodiment will also charge
7圖可清楚看出來各電池的充電狀況。 ，並繪製趨勢圖。 篆條810-880，由第 由此趨勢圖可清楚 201206006 看到線條810的上升速度比其他線條820-880的速度還要 快，表示平衡電源500正在為線條810的電池進行平衡充 電，當此電池完成平衡條件後，控制器320即開始尋找下 一個欲平衡的電池並開始平衡充電。在趨勢圖的上方可看 到各電池的電壓、最大電壓、最小電壓、電壓差以及總電 壓，右上角則有充電電源400及平衡電源500的電壓、電 流與功率，而下方可看到對應的時間，由對應的時間可觀 察到電池組100在大約22分鐘後即完成平衡充電，電壓 差也降至0.086V，表示此電池組100的電池電壓是很平衡 的狀態。由此可知本揭示内容之電池組充電平衡系統可有 效平衡電池組的電壓並提升充電的速度。 由上述實施方式可知，應用本揭示内容之電池組充電 平衡系統，透過充電電源400、平衡電源500及被平衡電 池選擇電路300的設計，能在短時間内將電池組100充飽 且為平衡的狀態，其主要是在本揭示内容之電池組充電平 衡系統在充電的同時即進行平衡的動作，無論電池組1〇〇 的電壓如何不平衡，依然可以將對電池組100進行充電動 作，不僅能有效大幅縮短充電的時間，當充電完畢時電池 組100的電壓也達到平衡的狀態。 雖然本揭示内容已以一實施方式揭露如上，然其並非 用以限定本揭示内容，任何熟習此技藝者，在不脫離本揭 示内容之精神和範圍内，當可作各種之更動與潤飾，因此 本揭示内容之保護範圍當視後附之申請專利範圍所界定者 為準。 11 201206006 【圖式簡單說明】 第1圖緣示本揭示内容一實施方式之電池組充電平衡 系統的示意圖； 第2圖繪示第1圖之被平衡電池選擇電路中電壓量測 電路的示意圖； 第3A圖繪示第1圖之被平衡電池選擇電路中多數個 切換開關的示意圖； 第3B圖繪示第1圖之被平衡電池選擇電路中控制器的 示意圖； 第4圖繪示第1圖之電池組充電平衡系統的舉例示意 IS] · 圆， 第5圖繪示第1圖之電池組充電平衡系統的流程圖； 第6圖繪示第1圖之電池組充電平衡系統的監控晝面·， 第7圖繪示第1圖之電池組充電平衡系統的電壓趨勢 圖。 【主要元件符號說明】 100 :電池組 110-190 :量測端點 200 :電壓量測電路 300 :被平衡電池選擇電路 310a-317a :切換開關 310b-317b :切換開關 320 :控制器 330 : RS-485通訊介面 [S1 201206006 400 :充電電源 500 :平衡電源 600-690 :步驟 700 :人機介面 810-880 :線條 B1-B8 :電池Figure 7 clearly shows the charging status of each battery. And draw a trend graph. The 810-880, from the first trend graph, can be seen 201206006. The rising speed of the line 810 is faster than the speed of the other lines 820-880, indicating that the balanced power supply 500 is balancing the battery of the line 810. After the battery completes the balancing condition, the controller 320 begins to look for the next battery to be balanced and begins to balance the charging. Above the trend graph, the voltage, maximum voltage, minimum voltage, voltage difference and total voltage of each battery can be seen. In the upper right corner, there are voltage, current and power of the charging power source 400 and the balanced power source 500, and the corresponding can be seen below. At the time, it can be observed from the corresponding time that the battery pack 100 completes the balanced charging after about 22 minutes, and the voltage difference also drops to 0.086 V, indicating that the battery voltage of the battery pack 100 is in a very balanced state. It can be seen that the battery pack charging balance system of the present disclosure can effectively balance the voltage of the battery pack and increase the speed of charging. It can be seen from the above embodiments that the battery pack charging balance system of the present disclosure can be fully charged and balanced in a short time by the design of the charging power source 400, the balanced power source 500, and the balanced battery selection circuit 300. The state is mainly the action of balancing the battery pack charging balance system of the present disclosure while charging, and the battery pack 100 can be charged even if the voltage of the battery pack 1 is unbalanced. The charging time is effectively shortened, and the voltage of the battery pack 100 is also balanced when the charging is completed. The present disclosure has been disclosed in an embodiment of the present invention, and is not intended to limit the disclosure, and various modifications and refinements may be made without departing from the spirit and scope of the present disclosure. The scope of the disclosure is defined by the scope of the appended claims. 11 201206006 [Simplified description of the drawings] FIG. 1 is a schematic diagram showing a battery pack charging balance system according to an embodiment of the present disclosure; FIG. 2 is a schematic diagram showing a voltage measuring circuit in the balanced battery selection circuit of FIG. 1; FIG. 3A is a schematic diagram showing a plurality of switching switches in the balanced battery selection circuit of FIG. 1; FIG. 3B is a schematic diagram of the controller in the balanced battery selection circuit of FIG. 1; FIG. 4 is a first diagram An example of a battery pack charging balance system is IS] · circle, FIG. 5 is a flow chart of the battery pack charging balance system of FIG. 1; and FIG. 6 is a schematic view of the battery pack charging balance system of FIG. · Figure 7 is a diagram showing the voltage trend of the battery pack charging balance system of Figure 1. [Description of main component symbols] 100: Battery pack 110-190: Measurement end point 200: Voltage measurement circuit 300: Balanced battery selection circuit 310a-317a: Diverter switch 310b-317b: Diverter switch 320: Controller 330: RS -485 communication interface [S1 201206006 400 : Charging power supply 500 : Balanced power supply 600-690 : Step 700 : Human machine interface 810-880 : Line B1-B8 : Battery