JP2015100046A - Battery management circuit of battery management device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery management circuit of a battery management device.SOLUTION: The present invention provides a battery management circuit of one type of a battery management device. The battery management device includes at least a first battery unit and a second battery unit which are connected in parallel. The battery management circuit includes a detection circuit and an adjustment circuit, and the detection circuit creates a first detection result by detecting a voltage relation between the first battery unit and the second battery unit. The adjustment circuit is connected to the detection circuit, and, when the first detection result indicates that the voltage relation does not satisfy a set voltage condition, adjusts a voltage of at least one of the first battery unit and the second battery unit, thereby allowing the voltage relation to satisfy the set voltage condition.

Description

  The present invention relates to battery management, and more particularly to a battery management circuit of a battery device that is powered up by a hot plug of a battery.

  Generally, a battery power supply system (Battery Power System, BPS) increases the overall battery capacity by an auxiliary battery (auXiliary battery). For example, if the user notices that the amount of electricity stored in the main battery is insufficient during the operation period of the battery power supply system, the power of the system needs to be maintained by increasing the auxiliary battery. . However, when the voltage difference between the subscribed auxiliary battery and the main battery is too large, hot plugging to the auxiliary battery can create a relatively large surge current. As a result, the battery power supply system can be damaged.

  For this reason, it is necessary to prevent damage to the power supply system formed by the battery hot plug by using a new battery management circuit.

  In view of this, one of the objects of the present invention is to solve the above problem by providing a battery management circuit of a battery device that can be powered up by hot plugging of the battery.

  According to an embodiment of the present invention, a battery management circuit for managing a kind of battery device is provided. The battery device includes at least a first battery unit and a second battery unit connected in parallel. The battery management circuit includes a detection circuit and an adjustment circuit, and the detection circuit generates a first detection result by detecting a voltage relationship between the first battery unit and the second battery unit. The adjustment circuit is connected to the detection circuit, and when the first detection result indicates that the voltage relationship does not satisfy a set voltage condition, at least one voltage of the first battery unit and the battery unit is set. To adjust the voltage relationship to satisfy the set voltage condition.

  According to an embodiment of the present invention, a battery management method for a battery management apparatus is provided. The battery device includes at least a first battery unit and a second battery unit connected in parallel. The battery management method includes the following steps. A first detection result is generated by detecting a voltage relationship between the first battery unit and the second battery unit. When the first detection result indicates that the voltage relationship does not satisfy a set voltage condition, at least one voltage of the first battery unit and the battery unit is adjusted, and thereby the set voltage is included in the voltage relationship. Satisfy the condition.

  The battery management mechanism of the battery management device provided by the present invention can effectively reduce or eliminate the surge current, and is applied to different battery management modes. Can be applied to manage more than one battery unit, so that when multiple battery units are hot plugged in the battery power supply system, the battery power supply system can still provide good power output .

It is a functional block display figure of an Example with the battery power supply system of this invention. 1 is a display diagram of an embodiment of a battery power supply system according to the present invention. 3 is a flowchart of an embodiment of a battery management method for the battery device shown in FIG. 2. FIG. 3 is a display diagram of a specific example when the battery device shown in FIG. 2 is operated in a charging mode. FIG. 3 is a display diagram of a specific example when the battery device shown in FIG. 2 is operated in a discharge mode. It is a display figure of another Example of the battery power supply system of this invention. It is a functional block display figure of another Example of the battery power supply system of this invention.

  In order to prevent excessive surge current caused by hot plug, the present invention provides a kind of battery management circuit, which is related to the voltage relationship between multiple batteries in the battery power supply system, and the battery power supply system at that time. By detecting the battery management mode, the battery voltage is adjusted accordingly, thereby eliminating or reducing the surge current. The present invention is described in further detail below.

Please refer to FIG. FIG. 1 is a functional block diagram of an embodiment of a battery power supply system according to the present invention. The battery power supply system 100 includes a battery device 110 and a battery management circuit 120. Among them, the battery device 110 provides the output voltage VOUT by the management operation of the battery management circuit 120. In this embodiment, the battery device 110 includes a first battery unit 112 ₁ and a second battery unit 112 ₂ , of which the first battery unit 112 ₁ and the second battery unit 112 ₂ have terminals NP and battery management. The circuits 120 are connected in parallel. When the second battery unit 112 ₂ is attached to the battery device 110, the first battery unit 112 ₁ is already attached in the battery device 110. In other words, the first battery unit 112 ₁ is regarded as a main battery of the battery device 110, and the second battery unit 112 ₂ is regarded as an auxiliary battery of the battery device 110. Thus, when the second battery unit 112 ₂ is added to the battery device 110, it is necessary to perform a battery management operations on the battery apparatus 110 by a battery management circuit 120, battery power supply system 100 by thereby surge current Can be prevented from being damaged.

The battery management circuit 120 detects the voltage relationship between the first battery unit 112 ₁ and the second battery unit 112 ₂ , and based on that, selectively both the first battery unit 112 ₁ and the second battery unit 112 ₂ . adjusting at least one voltage of the voltage difference between the first battery unit 112 ₁ and the second battery unit 112 ₂ is prevented from becoming excessive, thereby reducing the surge current. Specifically, the battery management circuit 120 can include a detection circuit 122 and an adjustment circuit 126. The detection circuit 122 is used to detect the voltage relationship between the first battery unit 112 ₁ and the second battery unit 112 ₂ and generate the first detection result DR1. When the first detection result DR1 indicates that the voltage relationship does not satisfy the set voltage condition (eg, the voltage difference between the two battery units exceeds the set voltage range), the adjustment circuit 126 The voltage of at least one of the first battery unit 112 ₁ and the second battery unit 112 ₂ is adjusted to satisfy the set voltage condition in the voltage relationship (for example, the voltage difference between two battery units is the set voltage Is in range). Before or after the adjustment circuit 126 completes the voltage adjustment operation or during the whole process, the battery power supply system 100 can subsequently provide the output voltage VOUT.

Since the first battery unit 112 ₁ is connected between the terminal NP and the terminal N1, and the second battery unit 112 ₂ is connected between the terminal NP and the terminal N2, the detection circuit 122 has the voltage V1 of the terminal N1 and detecting the voltage relationship between the first battery unit 112 ₁ receives the voltage V2 of the terminal N2 and the second battery unit 112 _2. The points to note are as follows. In certain embodiments, the detection circuit 122 may also detect the voltage relationship directly by the voltage difference between the voltage V1 and the voltage V2.

  In addition, the voltage relationship indicated by the first detection result DR1 is not limited to the voltage difference between the plurality of battery units, and the set voltage condition is not limited to “the voltage difference is within the set voltage range”. . For example, the voltage relationship indicated by the first detection result DR1 can be a voltage ratio value between a plurality of battery units, and the set voltage condition is “the voltage ratio value is smaller than the set ratio value”. Can be. In other words, any battery management circuit that can detect the voltage of a plurality of battery units and can be adjusted according to the situation is in accordance with the spirit of the present invention and is within the scope of the present invention. .

  As can be seen from the above, a battery hot plug can be executed in the battery device 110 by the management operation of the battery management circuit 120, and the battery power supply system 100 is not damaged. The points to note are as follows. The number of battery units shown by the battery device 110 should not be used to limit the present invention, that is, the battery device 110 also includes other battery units (not shown in FIG. 1), Surge current can be eliminated or reduced by applying the battery management mechanism described above.

The battery management circuit 120 shown in FIG. 1 has a basic circuit structure based on the concept of the present invention, so that any circuit adopting the circuit structure shown in FIG. It is in category. In order to facilitate understanding of the technical features of the present invention, the details of the battery management circuit of the present invention will be further described below by employing a specific embodiment. However, other circuits based on the circuit structure shown in FIG. 1 are also feasible. Please refer to FIG. It is a display diagram of an embodiment of the battery power supply system of the present invention, and the battery power supply system 200 includes a battery device 210 and a battery management circuit 220. Among them, the structure of the battery management circuit 220 is based on the structure of the battery management circuit 120 shown in FIG. In this embodiment, the battery device 210 includes a first battery unit 212 ₁ and a second battery unit 212 ₂ , of which the first battery unit 212 ₁ and the second battery unit 212 ₂ are connected to each other in series. A plurality of batteries B1 _{1 to} B1 _m and a plurality of batteries B2 _{1 to} B2 _n are included. Similarly, for ease of explanation, the first battery unit 212 ₁ is regarded as the main battery of the battery device 210, so that when the second battery unit 212 ₂ is added to the battery device 210, the battery management circuit 220 causes the battery device to Battery management operations need to be performed on 210.

The battery management circuit 220 includes a detection circuit 222 and an adjustment circuit 226. Among them, the detection circuit 222 detects the voltage relationship between the first battery unit 212 ₁ and the second battery unit 212 ₂ based on the voltage V1 at the terminal N1 and the voltage V2 at the terminal N2, thereby obtaining the first detection result DR1. Occur. In this embodiment, the detection circuit 222 includes a comparison unit 224, which compares the voltage difference between the first battery unit 212 ₁ and the second battery unit 212 ₂ with a set voltage range, 1 detection result DR1 is generated. The adjustment circuit 226 is connected to the detection circuit 222 and includes a plurality of first switch elements CM1 and CM2 and a plurality of second switch elements DM1 and DM2. Among them, the first switch element CM1 and the second switch element DM1 are connected to each other, and the first switch element CM2 and the second switch element DM2 are connected to each other. In this embodiment, the plurality of switch elements CM1, CM2, DM1, and DM2 are implemented by a plurality of switch transistors, each of which includes body diodes DD1, DD2, CD1, and CD2. Yes. For example, at least one of the plurality of switch elements CM1, CM2, DM1, and DM2 is implemented by a metal oxide semiconductor field effect transistor (MOSFET). As will be appreciated by those skilled in the art, the switch elements CM1, CM2, DM1, and DM2 can be implemented using other types of switch elements.

The first detection result DR1 indicates that the voltage relationship satisfies the set voltage condition (for example, the voltage difference between the voltage V1 and the voltage V2 is within the set voltage range). This means that the battery power supply system 200 is almost unaffected by the surge current. That is, the plurality of second switch elements DM1 and DM2 and the plurality of first switch elements CM1 and CM2 are all conducted. On the contrary, the first detection result DR1 indicates that when the voltage relationship does not satisfy the set voltage condition (for example, the voltage difference between the voltage V1 and the voltage V2 is not within the set voltage range), In a sense, it is necessary to eliminate or reduce the influence of the surge current on the battery power supply system 200 by performing voltage adjustment on at least one of the first battery unit 212 ₁ and the second battery unit 212 _2. ,That's what it means. Accordingly, the plurality of second switch elements DM1 and DM2 and the plurality of first switch elements CM1 and CM2 are selectively turned on based on the first detection result DR1.

  In general, a battery power supply system can provide a plurality of different power management modes. There may be differences in the battery management operations required by the battery device in different power management modes. Taking the battery power supply system 200 shown in FIG. 2 as an example, it also includes a charging circuit 230, a direct current to direct current converter (DC-DC converter) 240, a direct current to alternating current converter circuit. (Direct current to alternating current converter, DC-AC converter) 250 and a plurality of resistors R1 and R2. Among them, the plurality of resistors R1 and R2 are used to detect current. The battery device 210 generates an output voltage VOUT by the battery management circuit 220. The charging circuit 230 receives the input voltage VS and thereby charges the battery device 210. The DC / DC converter circuit 240 is used to convert the output voltage VOUT to a DC voltage VDC, and is used to provide it to an external load (not shown). The DC / AC converter circuit 250 is used to convert the output voltage VOUT to an AC voltage VAC and provide it to an external load (not shown).

  In this embodiment, when the battery device 210 is electrically connected to an external power source (for example, electrically connected to the input voltage VS via the charging circuit 230), the battery device 210 is in a charging mode. It is in. When the battery device 210 is not electrically connected to the external power source and the output voltage VOUT is not provided to the external load, the battery device 210 is in an idle mode. In addition, when the battery device 210 is not connected to the external power source and the output voltage VOUT is provided to the external load, the battery device 210 is in a discharging mode.

In order to manage the battery device according to different power management modes, when the above-mentioned first detection result DR1 indicates that the voltage relationship does not satisfy the set voltage condition, the detection circuit 222 also detects the battery device 210. The power management mode at that time is detected to generate the second detection result DR2, and the adjustment circuit 226 determines whether the first battery unit 212 ₁ or the second battery unit 212 ₂ is based on the second detection result DR2. Adjust at least one of the voltages. Hereinafter, the battery management operation of the battery management circuit 220 in different power management modes will be described.

Please refer to FIG. 3 together with FIG. FIG. 3 is a flowchart of an embodiment of the battery management circuit method of the battery device 210 shown in FIG. As described above, when the second battery unit 212 ₂ (ie, the auxiliary battery) is inserted into the battery device 210 (as shown in step 310), the battery management circuit 220 performs battery management operations on the battery device 210. There is a need to do. First, the detection circuit 222 detects whether or not the voltage difference between the first battery unit 212 ₁ and the second battery unit 212 ₂ is within the set voltage range (as shown in step 320). When the voltage difference is within the set voltage range, it indicates that the addition of the second battery unit 212 ₂ does not significantly affect the operation of the battery power supply system 200, and thereby the plurality of second switch elements DM1 and DM2 and the plurality of first switch elements CM1 and CM2 are conducted based on the first detection result DR1 (as shown in step 330). For example (however, the present invention is not limited to the following), the first detection result DR1 includes a plurality of switch control signals, and when the voltage difference is within the set voltage range, the plurality of switch control signals are respectively The plurality of switch elements DM1, DM2, CM1 and CM are made conductive, thereby causing the first battery unit 212 ₁ and the second battery unit 212 ₂ to output power via the battery management circuit 220 (as shown in step 370). ). In other words, the first battery unit 212 ₁ and the second battery unit 212 ₂ are electrically connected to each other in parallel.

When the voltage difference is not within the set voltage range, the addition of the second battery unit 212 ₂ indicates that the battery power supply system 200 can generate an excessive surge current. Accordingly, the detection circuit 222 detects the battery management mode of the battery device 210 at that time, and causes the adjustment circuit 226 to perform a subsequent voltage adjustment operation. In this embodiment, the detection circuit 222 detects the current power management mode of the battery device 210 by detecting whether or not the external power supply is connected to the battery device 210 (as shown in step 340). Among them, when the detection circuit 222 detects that the external power source is connected to the battery device 210, the battery device 210 is in the charging mode. When the detection circuit 222 detects that the external power source is not connected to the battery device 210, the battery device 210 is in a discharge mode or an idle mode.

Please refer to FIG. 4 together with FIG. FIG. 4 is a specific example display diagram in which the battery device 210 shown in FIG. 2 is operated in the charging mode. For ease of explanation, it is assumed here that the voltage of the second battery unit 212 ₂ is higher than the voltage of the first battery unit 212 ₁ . When the battery device 210 is operated in the charging mode, the plurality of first switch elements CM1 and CM2 are all conductive. The smaller the voltage difference between the first battery unit 212 ₁ and the second battery unit 212 ₂ , the smaller the influence of the surge current on the battery power supply system 200, whereby the second switch element DM 1 becomes conductive and the second The switch element DM2 can be disconnected (indicated by a dotted line), so that the charging circuit 230 slightly charges the first battery unit 212 ₁ , whereby the first battery unit 212 ₁ and the second battery unit 212 are charged. Reduce the voltage difference between ₂ (as shown in step 350). During the charging process, the detection circuit 222 continues to detect whether or not the voltage difference is within the set voltage range (as shown in step 354). When the voltage difference is still excessively large, the second switching element DM2 holds the disconnected state, thereby raising continues to first battery unit 212 _first voltage. Conversely, if in already the set voltage range the voltage difference, the second switching element DM2 is conductive starts (as shown in step 358), thereby, the first battery unit 212 ₁ and the second battery unit 212 ₂ each output power via battery management circuit 220 (as shown in step 370).

Please refer to FIG. 5 together with FIG. FIG. 5 is a display diagram of a specific embodiment when the battery device 210 shown in FIG. 2 is operated in the discharge mode. For purposes of explanation, it is again assumed that the voltage of the second battery unit 212 ₂ is higher than the first battery unit 212 ₁ . When the battery device 210 is operated in the discharge mode, the plurality of second switch elements DM1 and DM2 are all conducted. Similarly, in order to reduce the voltage difference between the first battery unit 212 ₁ and the second battery unit 212 ₂ , the first switch element CM2 becomes conductive and the first switch element CM1 is disconnected (indicated by a dotted line). This slightly discharges only the second battery unit 212 ₂ , thereby reducing the voltage difference between the first battery unit 212 ₁ and the second battery unit 212 ₂ (as shown in step 360). . During the discharging process, the detection circuit 222 continues to detect whether or not the voltage difference is within the set voltage range (as shown in step 364). When the voltage difference is still excessively large, the first switching element CM1 holds the disconnected state, thereby lowering continued to second battery unit 212 _{and second} voltage. Conversely, when the voltage difference is already in the set voltage range, the first switching element CM1 is turned starts (as shown in step 368), whereby the first battery unit 212 ₁ and the second battery unit 212 ₂ each output power via the battery management circuit 220 (as shown in step 370). In addition, when the battery device 210 is in the idle mode, the corresponding battery management operation and the battery management operation in the discharge mode are almost the same or the same, so that the description of the battery management operation in the idle mode is a duplicate description. Therefore, it is omitted.

Please refer to FIG. 2 again. As can be seen from the above, the mechanism for performing the battery management operation based on the battery management mode of the battery device at the time can be summarized as follows. The first detection result DR1 indicates that the voltage relationship between the first battery unit 212 ₁ and the second battery unit 212 ₂ does not satisfy the set voltage condition, and the second detection result DR2 indicates that the battery device 210 When the battery management mode at that time indicates the charging mode, the adjustment circuit 226 increases the voltage of the battery unit having a relatively low voltage among the first battery unit 212 ₁ and the second battery unit 212 ₂ , To satisfy the set voltage condition. The first detection result DR1 indicates that the voltage relationship between the first battery unit 212 ₁ and the second battery unit 212 ₂ does not satisfy the set voltage condition, and the second detection result DR2 indicates that the battery device 210 When the current battery management mode indicates the discharge mode or the idle mode, the adjustment circuit 226 reduces the voltage of the battery unit having a relatively high voltage among the first battery unit 212 ₁ and the second battery unit 212 _2. Thereby satisfying the set voltage condition.

In one embodiment, the plurality of second switch elements DM1 and DM2 and the plurality of first switch elements CM1 and CM2 can be implemented by other switch elements. For example, a plurality of switch elements connected to each battery unit can be replaced with a switch unit. See FIG. It is a display diagram of another embodiment of the battery power supply system of the present invention. The structure of the battery power supply system 600 is based on the structure of the battery power supply system 200 shown in FIG. 2, and the main difference between the two is that the adjustment circuit 626 included in the battery management circuit 620 is the first switch unit. 628 ₁ and the second switch unit 628 ₂ , of which the first switch unit 628 ₁ is implemented by the second switch element DM 1 and the first switch element CM 1 shown in FIG. 2, and the second switch unit 628 ₂ is This is implemented by the second switch element DM2 and the first switch element CM2 shown in FIG.

Similarly, when the second battery unit 212 ₂ is inserted into the battery device 210, the detection circuit 222 detects the voltage relationship between the first battery unit 212 ₁ and the second battery unit 212 ₂ , and the first detection result DR1 is generated. Subsequently, the first switch unit 628 ₁ and the second switch unit 628 ₂ are selectively turned on by the first detection result DR1. For example, when the first detection result DR1 indicates that the voltage relationship satisfies the set voltage condition, both the first switch unit 628 ₁ and the second switch unit 628 ₂ are made conductive.

In addition, when the first detection result DR1 indicates that the voltage relationship does not satisfy the set voltage condition, and the detection circuit 222 detects the power management mode of the battery device 210 at that time, the first switch unit 628 ₁ each switch unit in the second switching unit 628 ₂ is caused to selectively rendered conductive by separate power supply management mode. Consider a situation where the voltage of the second battery unit 212 ₂ is higher than the voltage of the first battery unit 212 ₁ . When the power supply management mode is the charging mode, since the first switch unit 628 ₁ is brought into conduction, first adjusting the voltage of the battery unit 212 _1, a second switch unit 628 ₂ is not brought into conduction. When the power management mode is set to the discharge mode or the idle mode, the first switch unit 628 ₁ is not turned on and the second switch unit 628 ₂ is turned on to adjust the voltage of the second battery unit 212 _2. . Those skilled in the art can easily understand the details of the operation of the battery power supply system 600 shown in FIG. 6 by reading the relevant descriptions of FIGS. 1-5, and will not be further described here.

As described above, the battery management mechanism provided by the present invention is not limited to the battery management of two battery units. Please refer to FIG. It is a functional block display diagram of another embodiment of the battery power supply system of the present invention. The battery power supply system 700 includes a battery device 710 and a battery management circuit 720. Among them, the battery device 710 includes a plurality of battery units 712 _{1 to} 712 _n , and the battery management circuit 720 includes a detection circuit 722 and an adjustment circuit 726. The adjustment circuit 726 is connected to the detection circuit 722 and includes a plurality of switch units 728 _{1 to} 728 _n . Among them, the plurality of switch units 728 _{1 to} 728 _n are connected to the plurality of battery units 712 _{1 to} 712 _n , respectively.

For the sake of explanation, the battery device 710 is already provided with m battery units 712 _{1 to} 712 _m (mutual voltages are substantially the same) (m is smaller than n), and (n−m) batteries. Assume that units 712 _{m + 1 to} 712 _n are inserted into the battery device 710. When (n−m) battery units 712 _{m + 1 to} 712 _n are inserted into the battery device 710, the detection circuit 722 detects a voltage relationship among the plurality of battery units 712 _{1 to} 712 _n and In addition, the detection circuit 722 also detects the current power management mode of the battery device 710 and generates the second detection result DR2. When the first detection result DR1 indicates that the voltage relationship satisfies the set voltage condition, the plurality of switch units 728 _{1 to} 728 _n are all turned on. When the first detection result DR1 indicates that the voltage relationship does not satisfy the set voltage condition, the plurality of switch units 728 _{1 to} 728 _n are selectively turned on by the second detection result DR2, thereby The voltage of at least one of the plurality of battery units 712 _{1 to} 712 _n is adjusted. Those skilled in the art can easily understand the details of the operation of the battery power supply system 700 shown in FIG. 7 by reading the relevant descriptions in FIGS. 1 to 6 and therefore will not be further described.

  In summary, the battery management mechanism provided by the present invention can be effectively applied to different power management modes in addition to effectively eliminating or reducing the surge current. In addition, the battery management mechanism provided by the present invention includes a plurality of (for example, The battery power supply system can still provide a good power output even if a plurality of battery units are hot plugged in the battery power supply system.

  What has been described above is a preferred embodiment of the present invention, and all equivalent modifications and variations that can be made based on the claims of the present invention are intended to be within the scope of the present invention.

100, 200, 600, 700 Battery power supply system 110, 210, 710 Battery devices 112 ₁ , 112 ₂ , 212 ₁ , 212 ₂ ,
712 ₁ , 712 _m , 712 _{m + 1} , 712 _n Battery unit 120, 220, 620, 720 Battery management circuit 122, 222, 622, 722 Detection circuit 126, 226, 626, 726 Adjustment circuit 224 Comparison unit 230 Charging circuit 240 DC / DC conversion circuit 250 DC / AC conversion circuit B1 ₁ , B1 ₂ , B1 _m , B2 ₁ , B2 ₂ , B1 _n Battery R1, R2 Resistors NP, N1, N2 Terminals CM1, CM2, DM1, DM2 Switch element CD1, CD2, DD1, DD2 body diodes 628 ₁ , 628 ₂ , 728 ₁ ,
728 _m , 728 _{m + 1} , 728 _n switch unit

Claims (12)

In a battery management circuit for managing a battery device, the battery device includes at least one first battery unit and a second battery unit connected in parallel, and the battery management circuit includes:
A detection circuit for detecting a voltage relationship between the first battery unit and the second battery unit and generating a first detection result;
An adjustment circuit connected to the detection circuit, and when the first detection result indicates that the voltage relationship does not satisfy a set voltage condition, at least one of the first battery unit and the second battery unit; Adjusting the voltage on one side to satisfy the set voltage condition in the voltage relationship; and
A battery management circuit comprising: The battery management circuit according to claim 1, wherein the detection circuit comprises:
A comparison unit comprising the comparison unit for comparing a voltage difference between the first battery unit and the second battery unit and a set voltage range, thereby generating the first detection result;
When the voltage difference between the first battery unit and the second battery unit is within the set voltage range, the first detection result indicates that the set voltage condition is satisfied, and the first battery unit When the voltage difference between the first battery unit and the second battery unit is not within the set voltage range, the first detection result indicates that the set voltage condition is not satisfied.   2. The battery management circuit according to claim 1, wherein when the first detection result indicates that the voltage relationship does not satisfy the set voltage condition, the detection circuit also detects a current power management mode of the battery device. Generating a second detection result, and the adjustment circuit adjusts a voltage of at least one of the first battery unit and the second battery unit based on the second detection result. circuit.   4. The battery management circuit according to claim 3, wherein the detection circuit detects the power management mode at the time of the battery device by detecting whether or not an external power source is connected to the battery device. And battery management circuit.   4. The battery management circuit according to claim 3, wherein when the second detection result indicates that the power management mode is a charging mode, the adjustment circuit detects whether the first battery unit and the second battery unit are relatively A battery management circuit characterized by satisfying the set voltage condition by increasing a voltage of a battery unit having a low voltage.   4. The battery management circuit according to claim 3, wherein when the second detection result indicates that the power management mode is a discharge mode or an idle mode, the adjustment circuit is in the first battery unit and the second battery unit. A battery management circuit characterized by satisfying the set voltage condition by lowering a voltage of a battery unit having a relatively high voltage. The battery management circuit according to claim 1, wherein the adjustment circuit includes:
A first switch unit connected to the first battery unit and selectively conducting based on the first detection result; and
A second switch unit that is connected to the second battery unit and selectively conducts based on the first detection result; and
A battery management circuit comprising:   8. The battery management circuit according to claim 7, wherein both the first switch unit and the second switch unit are made conductive when the first detection result indicates that the voltage relationship satisfies the set voltage condition. A battery management circuit.   9. The battery management circuit according to claim 8, wherein each one of the first switch unit and the second switch unit includes a first switch element and a second switch element, The second switch elements are connected to each other, and when the first detection result indicates that the voltage relationship satisfies the set voltage condition, each one switch in the first switch unit and the second switch unit A battery management circuit, wherein both the first switch element and the second switch element of a unit are made conductive.   8. The battery management circuit according to claim 7, wherein when the first detection result indicates that the voltage relationship does not satisfy the set voltage condition, each one of the first switch unit and the second switch unit. The battery management circuit, wherein the switch unit is also selectively turned on according to the power management mode of the battery device at that time.   11. The battery management circuit according to claim 10, wherein when the power management mode is set to a charging mode, the first switch unit is turned on, the voltage of the first battery unit is adjusted, and the second switch unit is turned on. When the power management mode is set to the discharge mode or the idle mode, the first switch unit is not turned on and the second switch unit is turned on to adjust the voltage of the second battery unit. A battery management circuit.   12. The battery management circuit according to claim 11, wherein each one of the first switch unit and the second switch unit includes a first switch element and a second switch element, The second switch elements are connected to each other, and when the power management mode is set to the charge mode, the first switch elements of each one of the first switch unit and the second switch unit are Both are made conductive, the second switch element of the first switch unit is made conductive, the second switch element of the second switch unit is disconnected, and the power management mode is set to the discharge mode or the idle mode. The second switch element of each one of the first switch unit and the second switch unit when Re is also made conductive, the first switching element of the second switch unit is brought into conduction, first switching element of the first switch unit is characterized in that it is cut, a battery management circuit.

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