Battery system

Abstract

This switches the battery module connection method while suppressing battery short circuits. [Solution] The system includes a first contactor S / C_A which is ON when the battery 2 is in a first voltage state and OFF when it is in a second voltage state, a second contactor S / C_B and a third contactor S / C_C which are ON when the battery 2 is in a second voltage state and OFF when it is in a first voltage state, and a switch drive mechanism 3 which switches between them. The switch drive mechanism 3 supplies a positive current to turn on the first contactor S / C_A and a reverse current to turn off the second contactor S / C_B and the third contactor S / C_C when the battery 2 is in a first voltage state, and supplies a positive current to turn on the second contactor S / C_B and the third contactor S / C_C and a reverse current to turn off the first contactor S / C_A when the battery 2 is in a second voltage state.

Description

Technical Field

[0001] The present invention relates to a battery system.

Background Art

[0002] In recent years, in order to enable more people to access affordable, reliable, sustainable, and advanced energy, research and development related to charging in mobility equipped with secondary batteries that contribute to energy efficiency has been carried out.

[0003] Regarding charging in mobility equipped with secondary batteries, charging facilities with different charging voltages are provided by charging stands. For example, there are two types of charging facilities corresponding to 400V and 800V. When the mobility only corresponds to the 400V-class charging facility, it cannot enjoy the fast charging performance of the 800V-class charging facility at the 800V-class charging facility.

[0004] When the mobility corresponds to both 400V-class and 800V-class charging facilities, generally, when charging at a 400V-class charging facility, it is charged by boosting to 800V with a voltage converter, or when charging at an 800V-class charging facility, it is charged by降压 to 400V with a voltage converter. However, passing through the voltage converter for charging during charging deteriorates the efficiency.

[0005] On the other hand, there is also known a mobility that can be charged at both a 400V-class charging facility and an 800V-class charging facility without using a voltage converter for charging by switching the connection method of the battery module (for example, Patent Documents 1 and 2).

[0006] In this type of mobility battery, there is a series switch that is ON when the battery modules are connected in series and OFF when they are connected in parallel, and a parallel switch that is ON when the battery modules are connected in parallel and OFF when they are connected in series. By appropriately switching these switches, efficient charging is possible even when the charging voltages are different. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2024-052465 [Patent Document 2] Japanese Patent Publication No. 2024-79278 [Overview of the project] [Problems that the invention aims to solve]

[0008] However, if the battery modules are connected in series and the parallel connection switch is unintentionally turned ON, or vice versa, there is a risk of a short circuit occurring in the battery.

[0009] This invention provides a battery system that can be charged even when the charging voltage is different, by switching the connection method of the battery module while suppressing battery short circuits. [Means for solving the problem]

[0010] The battery system of the present invention is A battery comprising: a first energy storage unit; a second energy storage unit; and a switch capable of switching between a first voltage state in which the first and second energy storage units are connected in series and can be charged at a first voltage, and a second voltage state in which the first and second energy storage units are connected in parallel and can be charged at a second voltage. A battery system comprising a switch drive mechanism for driving the aforementioned switch, The aforementioned switch is A first switch which is ON when the battery is in the first voltage state and OFF when it is in the second voltage state, The battery includes a second switch that is ON when the battery is in the second voltage state and OFF when the battery is in the first voltage state, The aforementioned switch drive mechanism comprises a power supply for driving the switch and a switch drive circuit. The aforementioned switch drive circuit is Connect the power supply and the positive terminal of the first switch, Connect the negative terminal of the first switch and the negative terminal of the second switch. Connect the positive terminal of the second switch to the power supply, The aforementioned switch drive mechanism is When the battery is in the first voltage state, a forward current is supplied to the first switch to turn it ON, and a reverse current is supplied to the second switch to turn it OFF. When the battery is in the second voltage state, a positive current is supplied to the second switch to turn it ON, and a reverse current is supplied to the first switch to turn it OFF. [Effects of the Invention]

[0011] According to the present invention, a battery system can be provided that can be charged even when the charging voltage is different, by switching the connection method of the battery module while suppressing battery short circuits. [Brief explanation of the drawing]

[0012] [Figure 1] This is a diagram of battery 2. [Figure 2] This diagram shows the first voltage state of battery 2 (800V startup). [Figure 3] This diagram shows the second voltage state of battery 2 (400V startup). [Figure 4] It is a diagram showing the battery system 1. [Figure 5] It is a diagram showing the first driving state (800V startup) of the battery system 1. [Figure 6] It is a diagram showing the second driving state (400V startup) of the battery system 1.

Embodiments for Carrying Out the Invention

[0013] Hereinafter, embodiments of the battery system of the present invention will be described with reference to the drawings.

[0014] As shown in FIGS. 4 to 6, the battery system 1 of the present embodiment includes a battery 2 and a switch drive mechanism 3. First, the battery 2 will be described with reference to FIGS. 1 to 3.

[0015] (Battery) As shown in FIGS. 1 to 3, the battery 2 includes a first power storage unit 21, a second power storage unit 22, and first to third contactors S / C_A, S / C_B, S / C_C.

[0016] The first power storage unit 21 and the second power storage unit 22 are battery modules capable of charging and discharging at 400V, respectively.

[0017] The first to third contactors S / C_A, S / C_B, S / C_C switch the connection state between the first power storage unit 21 and the second power storage unit 22. For example, as shown in FIG. 2, when the first contactor S / C_A is in the ON state and the second contactor S / C_B and the third contactor S / C_C are in the OFF state, the battery 2 is in the first voltage state (800V startup) in which the first power storage unit 21 and the second power storage unit 22 are connected in series, and charging and discharging at 800V becomes possible.

[0018] Furthermore, as shown in Figure 3, when the first contactor S / C_A is turned OFF and the second contactor S / C_B and third contactor S / C_C are turned ON, the battery 2 enters a second voltage state (400V startup) in which the first energy storage unit 21 and the second energy storage unit 22 are connected in parallel, enabling charging and discharging at 400V. Note that "startup" is a concept that includes driving when the vehicle is running and charging when the vehicle is stopped.

[0019] To explain in detail using Figures 1 to 3, the battery 2 includes a positive electrode node 23 that connects the positive electrode terminal of the first energy storage unit 21 and the positive electrode terminal of the second energy storage unit 22 in parallel, a negative electrode node 24 that connects the negative electrode terminal of the first energy storage unit 21 and the negative electrode terminal of the second energy storage unit 22 in parallel, and a connecting circuit 25 that connects the negative electrode terminal of the first energy storage unit 21 and the positive electrode terminal of the second energy storage unit 22. One end of the connecting circuit 25 is connected to the circuit connecting the positive electrode node 23 and the positive electrode terminal of the second energy storage unit 22 by a first connection part 26, and the other end is connected to the circuit connecting the negative electrode node 24 and the negative electrode terminal of the first energy storage unit 21 by a second connection part 27. The first contactor S / C_A is provided in the connecting circuit 25, the second contactor S / C_B is provided between the first connection part 26 and the positive electrode side node 23, and the third contactor S / C_C is provided between the second connection part 27 and the negative electrode side node 24.

[0020] (Switch drive mechanism) As shown in Figures 4 to 6, the switch drive mechanism 3 drives the first to third contactors S / C_A, S / C_B, and S / C_C. The contactors 4 that make up the first to third contactors S / C_A, S / C_B, and S / C_C include a pair of fixed contacts 41, a movable contact 42 that can move between an ON position in contact with the pair of fixed contacts 41 and an OFF position separated from the pair of fixed contacts 41, a movable iron core 43 that moves integrally with the movable contact 42, a coil 44 that moves the movable iron core 43 by the magnetic force it generates, a positive electrode 45 to which one end of the coil 44 is connected, and a negative electrode 46 to which the other end of the coil 44 is connected.

[0021] When a positive current (current flowing from the positive electrode 45 to the negative electrode 46) is supplied to the coil 44 of such a contactor 4, the positive magnetic force generated by the coil 44 causes the movable iron core 43 to move in the pulling direction. As a result, the movable contact 42 moves to the ON position where it contacts the pair of fixed contacts 41, and the contactor 4 becomes ON (forced ON state).

[0022] Furthermore, when a reverse current (current flowing from the negative electrode 46 to the positive electrode 45) is supplied to the coil 44, the movable iron core 43 moves in the pushing direction due to the reverse magnetic force generated by the coil 44. As a result, the movable contact 42 moves to the OFF position, separated from the pair of fixed contacts 41, and the contactor 4 enters the OFF state (forced OFF state).

[0023] Furthermore, when no current is supplied to the coil 44, the movable iron core 43 moves in the pushing direction due to the biasing force of the spring (not shown). As a result, the movable contact 42 moves to the OFF position, separated from the pair of fixed contacts 41, and the contactor 4 becomes OFF (normal OFF state).

[0024] The switch drive mechanism 3 comprises a power supply 5 and a switch drive circuit 6. The switch drive circuit 6 connects the power supply 5 to the positive terminal 45 of the first contactor S / C_A, connects the negative terminal 46 of the first contactor S / C_A to the negative terminal 46 of the second contactor S / C_B, connects the positive terminal 45 of the second contactor S / C_B to the negative terminal 46 of the third contactor S / C_C, and connects the positive terminal 45 of the third contactor S / C_C to the power supply 5. In other words, the switch drive circuit 6 connects the first contactor S / C_A, the second contactor S / C_B, and the third contactor S / C_C in series, and connects the negative terminal 46 of the first contactor S / C_A to the negative terminal of the second contactor S / C_B or the negative terminal of the third contactor S / C_C.

[0025] The order of series connection can be changed as appropriate. In this embodiment, the devices are not limited to being connected in series in the order of first contactor S / C_A, second contactor S / C_B, and third contactor S / C_C from power supply 5 back to power supply 5. They may also be connected in the order of second contactor S / C_B, first contactor S / C_A, and third contactor S / C_C.

[0026] Then, as shown in Figure 5, when the battery 2 is in the first voltage state (800V startup), the switch drive mechanism 3 supplies a positive current to the first contactor S / C_A to turn it ON, and supplies a reverse current to the second contactor S / C_B and the third contactor S / C_C to turn them OFF.

[0027] Furthermore, as shown in Figure 6, when the battery 2 is in the second voltage state (400V startup), the switch drive mechanism 3 supplies a positive current to the second contactor S / C_B and the third contactor S / C_C to turn them ON, and supplies a reverse current to the first contactor S / C_A to turn the first contactor S / C_A OFF.

[0028] With this switch drive mechanism 3, when the battery 2 is in the first voltage state (800V startup), a positive current is supplied to the first contactor S / C_A to turn it ON, and a reverse current is supplied to the second contactor S / C_B and the third contactor S / C_C to force them OFF. This prevents the second contactor S / C_B and the third contactor S / C_C from unexpectedly turning ON.

[0029] Furthermore, when the battery 2 is in the second voltage state (400V startup), the switch drive mechanism 3 not only supplies a positive current to the second contactor S / C_B and the third contactor S / C_C to turn them ON, but also supplies a reverse current to the first contactor S / C_A to forcibly turn it OFF, thus preventing the first contactor S / C_A from unexpectedly turning ON. This prevents the battery 2 from being short-circuited due to the unexpected ON state of the first to third contactors S / C_A, S / C_B, and S / C_C.

[0030] Specifically, the switch drive mechanism 3 of this embodiment comprises a control unit 7 and a switch drive circuit 6. The control unit 7 comprises a power supply 5, a first pin 71 connected to either the positive terminal 51 or the negative terminal 52 of the power supply 5, and a second pin 72 connected to the other of the positive terminal 51 and the negative terminal 52 of the power supply 5.

[0031] Furthermore, the switch drive circuit 6 includes a first series circuit 63 connecting the first pin 71 to the positive terminal 45 of the first contactor S / C_A, a second series circuit 64 connecting the negative terminal 46 of the first contactor S / C_A to the negative terminal 46 of the second contactor S / C_B, a third series circuit 65 connecting the positive terminal 45 of the second contactor S / C_B to the negative terminal 46 of the third contactor S / C_C, and a fourth series circuit 66 connecting the positive terminal 45 of the third contactor S / C_C to the second pin 72. This makes it possible to simultaneously supply current to the first to third contactors S / C_A, S / C_B, and S / C_C with a single control unit 7.

[0032] The control unit 7 further includes first to fourth selector switches 81 to 84. The first to fourth selector switches 81 to 84 switch between a first drive state in which current supplied from the power supply 5 is supplied to the switch drive circuit 6 from the first pin 71 and returned from the switch drive circuit 6 to the power supply 5 via the second pin 72, and a second drive state in which current supplied from the power supply 5 is supplied to the switch drive circuit 6 from the second pin 72 and returned from the switch drive circuit 6 to the power supply 5 via the first pin 71.

[0033] The first to fourth selector switches 81 to 84 set the battery 2 to the first drive state when it is in the first voltage state (800V start) and to the second drive state when it is in the second voltage state (400V start). This allows switching between the first voltage state (800V start) and the second voltage state (400V start) of the battery 2 to be achieved by switching between the first drive state and the second drive state using the first to fourth selector switches 81 to 84 of the control unit 7.

[0034] To explain in more detail, the first changeover switch 81 is provided between the positive terminal 51 and the second pin 72 of the power supply 5, the second changeover switch 82 is provided between the positive terminal 51 and the first pin 71 of the power supply 5, the third changeover switch 83 is provided between the negative terminal 52 and the first pin 71 of the power supply 5, and the fourth changeover switch 84 is provided between the positive terminal 51 and the second pin 72 of the power supply 5.

[0035] Then, as shown in Figure 5, when the first changeover switch 81 and the third changeover switch 83 are in the OFF state and the second changeover switch 82 and the fourth changeover switch 84 are in the ON state, it is in the first drive state, and as shown in Figure 6, when the first changeover switch 81 and the third changeover switch 83 are in the ON state and the second changeover switch 82 and the fourth changeover switch 84 are in the OFF state, it is in the second drive state.

[0036] As described above, according to this embodiment, when the battery 2 is in the first voltage state (800V startup), a positive current is supplied to the first contactor S / C_A to turn it ON, and a reverse current is supplied to the second contactor S / C_B and the third contactor S / C_C to turn them OFF, thereby preventing the second contactor S / C_B and the third contactor S / C_C from unexpectedly turning ON.

[0037] Similarly, when battery 2 is in the second voltage state (400V startup), a positive current is supplied to the second contactor S / C_B and the third contactor S / C_C to turn them ON, and a reverse current is supplied to the first contactor S / C_A to turn it OFF, thereby preventing the first contactor S / C_A from unexpectedly turning ON. This prevents the battery from short-circuiting.

[0038] Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to these examples. It is clear to those skilled in the art that various modifications or alterations can be conceived within the scope of the claims, and these will naturally also fall within the technical scope of the present invention. Furthermore, the components of the above embodiments may be combined in any way without departing from the spirit of the invention.

[0039] This specification contains at least the following information. Note that the components etc. in parentheses indicate those corresponding to the embodiments described above, but are not limited thereto.

[0040] (1) A battery (battery 2) comprising a first energy storage unit (first energy storage unit 21), a second energy storage unit (second energy storage unit 22), and a switch (first to third contactors S / C_A, S / C_B, S / C_C) that can switch between a first voltage state in which the first energy storage unit and the second energy storage unit are connected in series and can be charged at a first voltage (800V), and a second voltage state in which the first energy storage unit and the second energy storage unit are connected in parallel and can be charged at a second voltage (400V), A battery system (battery system 1) comprising a switch drive mechanism (switch drive mechanism 3) for driving the aforementioned switch, The aforementioned switch is A first switch (first contactor S / C_A) is configured to be ON when the battery is in the first voltage state and OFF when it is in the second voltage state. The battery includes a second switch (second contactor S / C_B and third contactor S / C_C) which is ON when the battery is in the second voltage state and OFF when it is in the first voltage state, The switch drive mechanism comprises a power supply (power supply 5) for driving the switch and a switch drive circuit (switch drive circuit 6). The aforementioned switch drive circuit is Connect the power supply and the positive terminal of the first switch, Connect the negative terminal of the first switch and the negative terminal of the second switch. Connect the positive terminal of the second switch to the power supply, The aforementioned switch drive mechanism is When the battery is in the first voltage state, a forward current is supplied to the first switch to turn it ON, and a reverse current is supplied to the second switch to turn it OFF. When the battery is in the second voltage state, a forward current is supplied to the second switch to turn it ON, and a reverse current is supplied to the first switch to turn it OFF. Battery system.

[0041] According to (1), when the battery is in the first voltage state, a positive current is supplied to the first switch to turn it ON, and a reverse current is supplied to the second switch to turn it OFF, thus preventing the second switch from unexpectedly turning ON. Also, when the battery is in the second voltage state, a positive current is supplied to the second switch to turn it ON, and a reverse current is supplied to the first switch to turn it OFF, thus preventing the first switch from unexpectedly turning ON. This prevents the battery from short-circuiting.

[0042] (2) The battery system described in (1), The aforementioned switch drive mechanism is The control unit (control unit 7) comprises the power supply, a first pin (first pin 71) connected to either the positive electrode (positive electrode 51) or the negative electrode (negative electrode 52) of the power supply, and a second pin (second pin 72) connected to the other of the positive electrode and the negative electrode of the power supply. The aforementioned switch drive circuit is A first circuit (first series circuit 63) connects the first pin and the positive terminal of the first switch, A second circuit (second series circuit 64 and third series circuit 65) connects the negative terminal of the first switch and the negative terminal of the second switch, The device comprises a third circuit (fourth series circuit 66) connecting the positive terminal of the second switch and the second pin, Battery system.

[0043] According to (2), a single control unit can simultaneously supply current to both the first and second switches.

[0044] (3) The battery system described in (2), The control unit is A first drive state in which current supplied from the power supply is supplied to the switch drive circuit from the first pin and returned from the switch drive circuit to the power supply via the second pin, The system further includes a drive switch (first to fourth selector switches 81 to 84) that can switch between a second drive state, in which current supplied from the power supply is supplied to the switch drive circuit from the second pin and returned from the switch drive circuit to the power supply via the first pin, The aforementioned drive switch is When the battery is in the first voltage state, it is set to the first drive state. When the battery is in the second voltage state, the second drive state is set. Battery system.

[0045] According to (3), the switching between the first voltage state and the second voltage state of the battery can be achieved by switching between the first drive state and the second drive state of the drive switch of the control unit.

[0046] (4) The battery system described in (3), The control unit includes first to fourth changeover switches (first to fourth changeover switches 81 to 84), The first changeover switch (first changeover switch 81) is provided between the positive terminal of the power supply and the second pin, The second changeover switch (second changeover switch 82) is provided between the positive terminal of the power supply and the first pin, The third changeover switch (third changeover switch 83) is provided between the negative terminal of the power supply and the first pin, The fourth changeover switch (fourth changeover switch 84) is provided between the negative terminal of the power supply and the second pin, When the first changeover switch and the third changeover switch are in the OFF state, and the second changeover switch and the fourth changeover switch are in the ON state, the first drive state is achieved. The second drive state is reached when the first changeover switch and the third changeover switch are in the ON state, and the second changeover switch and the fourth changeover switch are in the OFF state. Battery system.

[0047] According to (4), the switching between the first voltage state and the second voltage state of the battery can be achieved by switching the first to fourth changeover switches of the control unit between the ON state and the OFF state.

[0048] (5) A battery system as described in any of (1) to (4), The aforementioned battery is The first energy storage unit and, The second energy storage unit and, A positive electrode node (positive electrode node 23) connects the positive electrode terminal of the first energy storage unit and the positive electrode terminal of the second energy storage unit in parallel, A negative electrode node (negative electrode node 24) connects the negative electrode terminal of the first energy storage unit and the negative electrode terminal of the second energy storage unit in parallel, A connecting circuit (connecting circuit 25) connects the negative terminal of the first energy storage unit and the positive terminal of the second energy storage unit, The first contactor (first contactor S / C_A) is provided in the aforementioned connecting circuit, A second contactor (second contactor S / C_B) is provided between the first connection part (first connection part 26) that connects the positive terminal of the second energy storage unit and the connecting circuit, The system comprises a second connection part (second connection part 27) that connects the negative electrode terminal of the first energy storage unit to the connecting circuit, and a third contactor (third contactor S / C_C) provided between the negative electrode node, The first switch is composed of the first contactor, The second switch is composed of the second contactor and the third contactor. Battery system.

[0049] According to (5), the ON state can be maintained by passing a positive current through the contactor coil, and the OFF state can be maintained by passing a reverse current through the contactor coil, thus enabling a simple configuration to avoid short-circuiting the battery. [Explanation of Symbols]

[0050] 1. Battery System 2 batteries 3. Switch drive mechanism 5 Power supply 6. Switch drive circuit 7 Control Unit 21. First Energy Storage Unit 22. Second Energy Storage Unit 23 Positive side node 24 Negative side node 25 Connection circuit 26. First connection section 27 Second connection section 51 Positive electrode 52 Negative electrode 63 1st series circuit (1st circuit) 64 Second series circuit (second circuit) 65 Third series circuit (second circuit) 66 4th series circuit (3rd circuit) 71 Pin 1 72 Pin 2 81. First changeover switch 82 Second changeover switch 83. Third changeover switch 84. Fourth changeover switch 400V (Second Voltage) 800V (First Voltage) S / C_A First Contactor (First Switch) S / C_B Second Contactor (Second Switch) S / C_C Third Contactor (Second Switch)

Claims

1. A battery comprising: a first energy storage unit; a second energy storage unit; and a switch capable of switching between a first voltage state in which the first and second energy storage units are connected in series and can be charged at a first voltage, and a second voltage state in which the first and second energy storage units are connected in parallel and can be charged at a second voltage. A battery system comprising a switch drive mechanism for driving the aforementioned switch, The aforementioned switch is A first switch which is ON when the battery is in the first voltage state and OFF when it is in the second voltage state, The battery includes a second switch which is ON when the battery is in the second voltage state and OFF when the battery is in the first voltage state, The aforementioned switch drive mechanism comprises a power supply for driving the switch and a switch drive circuit. The aforementioned switch drive circuit is Connect the power supply and the positive terminal of the first switch, Connect the negative terminal of the first switch to the negative terminal of the second switch. Connect the positive terminal of the second switch to the power supply, The aforementioned switch drive mechanism is When the battery is in the first voltage state, a forward current is supplied to the first switch to turn the first switch ON, and a reverse current is supplied to the second switch to turn the second switch OFF. When the battery is in the second voltage state, a forward current is supplied to the second switch to turn it ON, and a reverse current is supplied to the first switch to turn it OFF. Battery system.

2. A battery system according to claim 1, The aforementioned switch drive mechanism is The control unit comprises the power supply, a first pin connected to either the positive or negative terminal of the power supply, and a second pin connected to the other of the positive and negative terminals of the power supply. The aforementioned switch drive circuit is A first circuit connecting the first pin and the positive terminal of the first switch, A second circuit connecting the negative terminal of the first switch and the negative terminal of the second switch, The device comprises a third circuit connecting the positive terminal of the second switch and the second pin, Battery system.

3. The battery system according to claim 2, The control unit is A first drive state in which current supplied from the power supply is supplied to the switch drive circuit from the first pin and returned from the switch drive circuit to the power supply via the second pin, The system further includes a drive switch that can switch between a second drive state, in which current supplied from the power supply is supplied to the switch drive circuit via the second pin and returned from the switch drive circuit to the power supply via the first pin, and a second drive state. The aforementioned drive switch is When the battery is in the first voltage state, it is set to the first drive state. When the battery is in the second voltage state, the second drive state is set. Battery system.

4. The battery system according to claim 3, The control unit includes first to fourth changeover switches, The first changeover switch is provided between the positive terminal of the power supply and the second pin. The second changeover switch is provided between the positive terminal of the power supply and the first pin, The third changeover switch is provided between the negative terminal of the power supply and the first pin, The fourth changeover switch is provided between the negative terminal of the power supply and the second pin, When the first changeover switch and the third changeover switch are in the OFF state, and the second changeover switch and the fourth changeover switch are in the ON state, the first drive state is achieved. The second drive state is reached when the first changeover switch and the third changeover switch are in the ON state, and the second changeover switch and the fourth changeover switch are in the OFF state. Battery system.

5. A battery system according to any one of claims 1 to 4, The aforementioned battery is The first energy storage unit and, The second energy storage unit and, A positive electrode node that connects the positive electrode terminal of the first energy storage unit and the positive electrode terminal of the second energy storage unit in parallel, A negative electrode node that connects the negative electrode terminal of the first energy storage unit and the negative electrode terminal of the second energy storage unit in parallel, A connecting circuit that connects the negative terminal of the first energy storage unit and the positive terminal of the second energy storage unit, The first contactor provided in the aforementioned coupling circuit, A second contactor is provided between the first connection part, which connects the positive terminal of the second energy storage unit to the connecting circuit, and the positive node, The system comprises a third contactor provided between a second connection part that connects the negative electrode terminal of the first energy storage unit to the connecting circuit and the negative electrode node, The first switch is composed of the first contactor, The second switch is composed of the second contactor and the third contactor. Battery system.

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