Battery monomer voltage detection device

Abstract

The invention provides a single battery voltage detection device. This battery cell voltage detection device is provided with: a circuit board provided with a plurality of wires connected to a plurality of battery cells constituting a power storage module; and a processing unit that is connected to the circuit board and detects the voltage of each of the plurality of battery cells. The circuit board is provided with: at least one first switching unit that is provided on at least one predetermined conductive line and that switches between conduction and non-conduction; and at least one second switching unit that switches between conduction and non-conduction between a first portion between the first switching unit and the processing unit among the wires provided with the first switching unit, and a second portion that is at least one predetermined wire selected according to a predetermined withstand voltage of the processing unit.

Description

Technical Field

[0001] The invention relates to a battery single cell voltage detection device. Background Art

[0002] In recent years, efforts to realize a low-carbon society or a decarbonized society have become increasingly active, and in order to reduce CO 2 In order to reduce emissions and improve energy efficiency, research and development related to electrification technology has also been carried out. In this electrification technology, for example, if the battery used is a lithium-ion battery, the voltage of each battery cell constituting the battery pack is monitored to control the battery capacity. At this time, in order to detect the voltage of each single battery cell, a detection line is connected to the control device. It is known that a jumper resistor is provided on the detection line in order to cut off the connection (for example, refer to the following patent document 1).

[0003] In this device, in order to use a common substrate regardless of the number of battery cells in the battery pack, the jumper resistor is set to be non-installed according to the number of battery cells that can be supported on the substrate side. Therefore, even if the number of battery cells in the battery pack is greater than the number of battery cells that can be supported on the substrate side due to, for example, incorrect connection of the battery pack, the short circuit of the single battery cell on the substrate can be prevented by disconnecting the connection at the detection line.

[0004] [Patent Document 1] International Publication No. 2018 / 235457 Summary of the invention

[0005] In technologies related to electrification technology, for example, when the number of battery cells in a battery pack is smaller than the number of corresponding battery cells on the substrate side, it is necessary to be able to appropriately detect the voltage of each single battery cell. In addition, even when the number of battery cells in a battery pack is larger than the number of battery cells that can be matched on the substrate side due to misconnection, etc., it is a problem to prevent abnormalities such as short circuits and overvoltages on the substrate from occurring.

[0006] The present invention has been proposed in consideration of such a situation, and its object is to achieve desired versatility in a battery cell voltage detection device while preventing abnormalities such as short circuits and overvoltages from occurring, and to further contribute to improvement in energy efficiency.

[0007] In order to solve the above problems and achieve the above objects, the present invention adopts the following means.

[0008] (1): A battery cell voltage detection device according to one embodiment of the present invention comprises: a circuit body having a plurality of conducting wires connected to a plurality of single battery cells constituting a power storage module; and a processing unit connected to the circuit body to detect the voltage of each of the plurality of single battery cells, wherein the circuit body comprises: at least one first switching unit arranged on at least one specified conducting wire to switch between conduction and non-conduction; and at least one second switching unit to switch between conduction and non-conduction between the following two locations, the first location being between the first switching unit and the processing unit in the conducting wire provided with the first switching unit, and the second location being at least one specified conducting wire selected according to a specified withstand voltage of the processing unit.

[0009] (2): In the above scheme (1), it may also be that the processing unit comprises: a first terminal, which is connected to the first conductive wire on the low potential side; a second terminal, which is connected to the second conductive wire on the high potential side; and N terminals, which are connected to N different conductive wires between the first terminal and the second terminal in the potential sequence and do not participate in the voltage detection performed by the processing unit, wherein N is an arbitrary natural number, and when the number of single battery cells equivalent to the specified withstand voltage is M, the circuit body comprises (NM) switching modules, wherein M is an arbitrary natural number less than the natural number N, and the switching module comprises: a conductive wire switching unit, which switches the conduction and non-conduction of the conductive wire on the low potential side of two conductive wires adjacent to each other in the potential sequence; and a conductive wire switching unit, which switches the conduction and non-conduction between the two conductive wires.

[0010] (3): In the above scheme (1) or (2), the circuit body may also have a third switching unit, which is arranged on the conductor adjacent to the high potential side relative to the conductor on the highest potential side connected to the second switching unit to switch between conduction and non-conduction.

[0011] According to the above scheme (1), the first switching unit and the second switching unit for switching between conduction and non-conduction are provided, so that the number of channels for voltage detection corresponding to the number of single battery cells that the processing unit can correspond to can be appropriately handled without changing the wiring pattern of the circuit body. For example, even if a storage module having a larger number of single battery cells than the number of channels of the processing unit is connected by mistake, the first switching unit and the second switching unit can prevent the occurrence of abnormalities such as short circuits and overvoltages. It is possible to ensure the versatility of appropriately corresponding to multiple processing units with different numbers of channels, and to prevent abnormalities from occurring even when a storage module that does not appropriately correspond to the processing unit is connected by mistake.

[0012] In the case of the above scheme (2), the number of switching modules composed of the wire switching unit and the wire switching unit for switching between conduction and non-conduction is set according to the number N of terminals not participating in the voltage detection by the processing unit and the number M of single battery cells corresponding to the specified withstand voltage of the processing unit, thereby improving versatility. By providing (NM) switching modules, it is possible to appropriately correspond to the number of channels for voltage detection by the processing unit, and even when the storage module that does not appropriately correspond to the processing unit is erroneously connected, it is possible to prevent abnormalities such as short circuits and overvoltages from occurring.

[0013] According to the above solution (3), by providing the third switching unit that switches between conduction and non-conduction, it is possible to ensure versatility in appropriately cooperating with a plurality of processing units with different numbers of channels, and to prevent abnormality from occurring even when a storage module that does not appropriately correspond to a processing unit is erroneously connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a diagram showing the configuration of a power storage system including a battery cell voltage detection device according to an embodiment of the present invention.

[0015] Figure 2 It is a diagram showing a first example of a combination of a circuit board and a processing unit in a battery cell voltage detection device according to an embodiment of the present invention.

[0016] Figure 3 It is a diagram showing a second example of a combination of a circuit board and a processing unit in the battery cell voltage detection device according to the embodiment of the present invention.

[0017] Figure 4 It is a diagram showing a third example of a combination of a circuit board and a processing unit in the battery cell voltage detection device according to the embodiment of the present invention.

[0018] Figure 5 It is a diagram showing a fourth example of a combination of a circuit board and a processing unit in the battery cell voltage detection device according to the embodiment of the present invention.

[0019] Figure 6 It is a diagram showing a fifth example of a combination of a circuit board and a processing unit in the battery cell voltage detection device according to the embodiment of the present invention. DETAILED DESCRIPTION

[0020] Hereinafter, a battery cell voltage detection device according to an embodiment of the present invention will be described with reference to the drawings.

[0021] Figure 11 is a block diagram of a power storage system 1 including a battery cell voltage detection device 10 according to an embodiment. The power storage system 1 according to this embodiment is mounted on various mobile bodies, such as electric vehicles, hybrid vehicles, fuel cell vehicles, etc., mobile working machines, and other robots.

[0022] like Figure 1 As shown, the power storage system 1 includes, for example, a power storage module 3, wiring 5, a processing unit 7, and a circuit board 9. For example, the processing unit 7 and the circuit board 9 constitute a battery cell voltage detection device 10.

[0023] The power storage module 3 includes a plurality of battery cells 11 connected in series. The plurality of battery cells 11 are, for example, k battery cells 11 (k is a predetermined number). The voltages of the plurality of battery cells 11 are, for example, sequentially voltages V1, ..., Vk.

[0024] The power storage module 3 is provided with a plurality of terminals 13 connected to the wiring 5 described later. The plurality of terminals 13 are, for example, n terminals S1, ..., Sn (n is a specified number) commonly set in the wiring 5, the processing unit 7 and the circuit substrate 9 in the appropriate combination described later. The specified number n is set to (k+1) or more (k is a specified number), thereby allowing the plurality of power storage modules 3 having different numbers of battery cells 11 to share the wiring 5 and the circuit substrate 9, and allowing the existence of a terminal 13 that is not connected to any battery cell 11.

[0025] For example, the power storage module 3 is composed of a plurality of battery cell modules connected in series. Each battery cell module is composed of various numbers of battery cells 11 obtained by dividing a plurality of battery cells 11 and various numbers of terminals 13 obtained by dividing a plurality of terminals 13 .

[0026] The wiring 5 includes a plurality of pairs of terminals 15. The plurality of pairs of terminals 15 are, for example, n pairs of terminals 15 (n is a predetermined number). The wiring 5 connects the plurality of terminals 13 of the power storage module 3 and the plurality of terminals 21 of the circuit substrate 9 described later in a predetermined order. The wiring 5 establishes a correspondence relationship between, for example, a predetermined order from the low potential side to the high potential side among the plurality of terminals 13 of the power storage module 3 and a predetermined order from the low potential side to the high potential side among the plurality of terminals 21 of the circuit substrate 9.

[0027] For example, the wiring 5 is composed of a plurality of harnesses corresponding to a plurality of battery cell modules of the power storage module 3. Each harness is composed of a plurality of pairs of terminals 15 corresponding to the number of terminals 13 of each battery cell module.

[0028] The processing unit 7 is, for example, a software function unit that performs functions by executing a predetermined program by a processor such as a CPU (Central Processing Unit). The software function unit is an ECU that includes a processor such as a CPU, a ROM (Read Only Memory) for storing programs, a RAM (Random Access Memory) for temporarily storing data, and electronic circuits such as a timer. It should be noted that at least a part of the processing unit 7 may also be an integrated circuit such as an LSI (Large Scale Integration).

[0029] The processing unit 7 is mounted on a circuit board 9 to be described later. The processing unit 7 includes, for example, a plurality of connection terminals 17 and a plurality of detection terminals 19 .

[0030] A plurality of connection terminals 17 are connected to the wiring of the circuit substrate 9. The plurality of connection terminals 17 are, for example, n connection terminals P1, ..., Pn (n is a specified number). The plurality of detection terminals 19 are terminals for detecting the voltage of each single battery cell 11 of the power storage module 3, and are connected to the plurality of connection terminals 17. The plurality of detection terminals 19 are, for example, m detection terminals R1, ..., Rm (m is a specified number). The specified number m is set to be less than the specified number n, thereby allowing the circuit substrate 9 to be shared by a plurality of processing units 7 having different numbers of detection terminals 19 through so-called pin compatibility, and allowing the existence of connection terminals 17 that are not connected to any detection terminals 19.

[0031] The processing unit 7 detects the voltage between two detection terminals 19 connected to both ends of each battery cell 11 of the power storage module 3 .

[0032] The circuit substrate 9 is a so-called rigid substrate, a flexible substrate, a rigid-flexible substrate, or a flexible substrate. The circuit substrate 9 is not limited to a rigid plate-shaped substrate, and may be a film-shaped substrate having at least one of flexibility and flexibility. The circuit substrate 9 is, for example, an electronic component such as wiring and electronic components directly arranged on various substrates.

[0033] The circuit board 9 includes a plurality of terminals 21 , a plurality of conductive wires 25 forming wirings 23 , at least one first switching portion 27 a , and at least one second switching portion 27 b .

[0034] The plurality of terminals 21 are connected to the plurality of terminals 13 of the power storage module 3 via the wiring 5. The plurality of terminals 21 are, for example, n terminals T1, ..., Tn (n is a predetermined number).

[0035] The plurality of wires 25 are provided between the plurality of terminals 21 and the plurality of connection terminals 17 of the processing section 7. The plurality of wires 25 are, for example, n wires L1, ..., Ln (n is a specified number). The plurality of wires 25 connect the plurality of terminals 21 and the plurality of connection terminals 17 of the processing section 7 in a specified order. The plurality of wires 25, for example, establish a correspondence between the specified order from the low potential side to the high potential side of the plurality of terminals 21 and the specified order from the low potential side to the high potential side of the plurality of connection terminals 17 of the processing section 7.

[0036] At least one first switching unit 27a is provided in at least one predetermined wire 25 selected from among the plurality of wires 25 according to the internal structure of the processing unit 7. The first switching unit 27a switches the conduction and non-conduction of the wire 25 by, for example, switching between installation and non-installation of a so-called jumper resistor or switching by opening and closing a switch.

[0037] At least one second switching portion 27b is provided between the first switching portion 27a and the processing portion 7 in the conductor 25 provided with the first switching portion 27a, and the second portion is at least one specified conductor 25 selected according to the specified withstand voltage of the processing portion 7. The second switching portion 27b switches between conduction and non-conduction among the specified plurality of conductors 25, for example, by switching between installation and non-installation of a so-called jumper resistor or switching by opening and closing a switch.

[0038] Switching between conduction (ON) and non-conduction (OFF) of each of the first switching portion 27a and the second switching portion 27b is set according to differences in internal structures such as connection states of the plurality of connection terminals 17 and the plurality of detection terminals 19 in the processing portion 7, for example.

[0039] In the power storage system 1, when the power storage module 3, the wiring 5, the processing unit 7, and the circuit board 9 are connected in a normal and appropriate state, the number of voltage detection channels in the processing unit 7 (i.e., the number of battery cell voltages that can be detected for each battery cell 11) is set to be greater than the number of the plurality of battery cells 11 constituting the power storage module 3. For example, the number of voltage detection channels (m-1) corresponding to m (m is a predetermined number) detection terminals 19 in the processing unit 7 is set to be greater than the number (k) of battery cells 11 in the power storage module 3 (k is a predetermined number).

[0040] Figure 2 This is a diagram showing a first example of a combination of the circuit board 9 ( 9 a ) and the processing unit 7 ( 7 a ) in the battery cell voltage detection device 10 according to the embodiment. Figure 3 This is a diagram showing a second example of the combination of the circuit board 9 ( 9 b ) and the processing unit 7 ( 7 b ) in the battery cell voltage detection device 10 according to the embodiment.

[0041] Figure 2 The first embodiment shown represents the structure of a circuit substrate 9 (9a) in which there is a connection terminal 17 (NC) that is not connected to any detection terminal 19 and does not participate in the voltage detection performed by the processing unit 7 (7a), for example because the prescribed number m in the processing unit 7 (7a) is less than the prescribed number n.

[0042] Figure 3 The second embodiment shown shows the structure of the circuit board 9 (9b) when all the connection terminals 17 (C1, C2, C3) are connected to the detection terminals 19 to participate in voltage detection, for example, because the specified number m and the specified number n in the processing unit 7 (7b) are the same.

[0043] like Figure 2 As shown, the circuit board 9 (9a) of the first embodiment includes, for example, a first wire 25 (L1), a second wire 25 (L2), and a third wire 25 (L3) arranged in sequence from the low potential side to the high potential side. The first wire 25 (L1) is connected to the first terminal 21 (T1) and the first connection terminal 17 (C1) on the low potential side. The second wire 25 (L2) is connected to the second terminal 21 (T2) and the connection terminal 17 (NC) between the low potential side and the high potential side. The third wire 25 (L3) is connected to the third terminal 21 (T3) and the second connection terminal 17 (C2) on the high potential side.

[0044] The circuit board 9 (9a) of the first embodiment includes, for example, a first switch 27a that sets the second conductive wire 25 (L2) to non-conduction (OFF), and a second switch 27b that sets the second conductive wire 25 (L2) to conduction (ON) with the third conductive wire 25 (L3).

[0045] The first switching unit 27a of the first embodiment is set to non-conductive (OFF), thereby preventing the occurrence of a short circuit caused by the second switching unit 27b set to conductive (ON) even when the storage module 3 that does not properly correspond to the processing unit 7 (7a) is connected incorrectly. Figure 2 The power storage module 3 shown has k battery cells 11 (m is a predetermined number, k is a predetermined number) which is greater than the number of channels (m-1) in the processing unit 7 (7a), and is in a state of being incorrectly connected to the circuit board 9 (9a).

[0046] The second switch 27b of the first embodiment is set to ON, thereby preventing an excessive number of capacitors from being provided between the wires 25 adjacent in order of potential, even when a capacitor for voltage smoothing is required between the two detection terminals 19 in the processing unit 7 (7a). Figure 2In the circuit board 9 (9a) shown, the voltage (V1+V2) generated by the two battery cells 11 between the two detection terminals 19 is smoothed only by a capacitor provided between the first conductor 25 (L1) and the second conductor 25 (L2) (i.e., no capacitor is required between the second conductor 25 (L2) and the third conductor 25 (L3)).

[0047] like Figure 3 As shown, for example, similar to the circuit board 9 (9a) of the first embodiment, the circuit board 9 (9b) of the second embodiment includes a first wire 25 (L1), a second wire 25 (L2), and a third wire 25 (L3). The first wire 25 (L1) is connected to the first terminal 21 (T1) and the first connection terminal 17 (C1) on the low potential side. The second wire 25 (L2) is connected to the second terminal 21 (T2) and the second connection terminal 17 (C2) between the low potential side and the high potential side. The third wire 25 (L3) is connected to the third terminal 21 (T3) and the third connection terminal 17 (C3) on the high potential side.

[0048] The circuit board 9 (9b) of the second embodiment includes, for example, a first switch 27a that sets the second conductive wire 25 (L2) to conduct (ON), and a second switch 27b that sets the second conductive wire 25 (L2) to non-conduct (OFF) between the second conductive wire 25 (L2) and the third conductive wire 25 (L3).

[0049] The first switching unit 27a and the second switching unit 27b of the second embodiment can prevent short circuits between the conductive wires 25 adjacent in order of potential and appropriately generate voltages of the battery cells 11 between the detection terminals 19 adjacent in order of potential when the storage modules 3 corresponding to the processing unit 7 (7b) are connected. Figure 3 The illustrated power storage module 3 includes k battery cells 11 (m is a predetermined number, k is a predetermined number) which is the same as the number of channels (m-1) in the processing unit 7, and is appropriately connected to the circuit board 9 (9b).

[0050] Figure 4 It is a diagram showing a third example of the combination of the circuit board 9 ( 9 c ) and the processing unit 7 ( 7 c ) in the battery cell voltage detection device 10 according to the embodiment. Figure 5 It is a diagram showing a fourth example of the combination of the circuit board 9 (9d) and the processing unit 7 (7d) in the battery cell voltage detection device 10 according to the embodiment.

[0051] Figure 4The third embodiment shown represents the structure of a circuit substrate 9 (9c) in which there is a connection terminal 17 (NC) that is not connected to any detection terminal 19 and does not participate in the voltage detection performed by the processing unit 7 (7c), for example because the prescribed number m in the processing unit 7 (7c) is less than the prescribed number n.

[0052] Figure 5 The fourth embodiment shown shows the structure of the circuit board 9 (9d) when all the connection terminals 17 (C1, C2, C3, C4) are connected to the detection terminals 19 to participate in voltage detection, for example, because the specified number m in the processing unit 7 (7d) is the same as the specified number n.

[0053] like Figure 4 As shown, the circuit board 9 (9c) of the third embodiment includes, for example, a first wire 25 (L1), a second wire 25 (L2), a third wire 25 (L3), and a fourth wire 25 (L4) arranged in sequence from the low potential side to the high potential side. The first wire 25 (L1) is connected to the first terminal 21 (T1) and the first connection terminal 17 (C1) on the low potential side. The second wire 25 (L2) is connected to the second terminal 21 (T2) and the connection terminal 17 (NC) between the low potential side and the high potential side. The third wire 25 (L3) is connected to the third terminal 21 (T3) and the connection terminal 17 (NC) between the low potential side and the high potential side. The fourth wire 25 (L4) is connected to the fourth terminal 21 (T4) and the second connection terminal 17 (C2) on the high potential side. It should be noted that the first connection terminal 17 (C1) in the processing unit 7 (7c) is set to a reference potential, for example, by the ground terminal G or the like.

[0054] The circuit board 9 (9c) of the third embodiment includes, for example, a first switching unit 27a that sets the first conductor 25 (L1) to be non-conductive (OFF), a second switching unit 27b that sets the first conductor 25 (L1) to be conductive (ON) between the first conductor 25 (L1) and the second conductor 25 (L2), and a third switching unit 27c that sets the third conductor 25 (L3) to be non-conductive (OFF). The third switching unit 27c switches the conduction and non-conduction of the conductor 25 by, for example, switching between installation and non-installation of a so-called jumper resistor or switching based on the opening and closing of a switch. The first switching unit 27a, the second switching unit 27b, and the third switching unit 27c form, for example, a first switching module 27.

[0055] The first switching module 27 of the third embodiment can prevent an overvoltage from being generated between the two detection terminals 19 even when the power storage module 3 that does not properly correspond to the processing unit 7 (7c) is erroneously connected. Figure 4The illustrated power storage module 3 includes k battery cells 11 (m is a predetermined number, k is a predetermined number) which is greater than the number of channels (m-1) in the processing unit 7 (7c), and is in a state of being incorrectly connected to the circuit board 9 (9c).

[0056] Figure 4 The circuit board 9 (9c) shown prevents the voltage (V3+V2+V1) based on three battery cells 11 from being generated between the two detection terminals 19, and generates the voltage (V3+V2) based on two battery cells 11. For example, the voltage (V3+V2) generated by the two battery cells 11 is lower than the specified withstand voltage of the processing unit 7 (7c), and the voltage (V3+V2+V1) generated by the three battery cells 11 is an overvoltage higher than the specified withstand voltage of the processing unit 7 (7c).

[0057] like Figure 5 As shown, for example, similar to the circuit board 9 (9c) of the third embodiment, the circuit board 9 (9d) of the fourth embodiment includes a first wire 25 (L1), a second wire 25 (L2), a third wire 25 (L3) and a fourth wire 25 (L4). The first wire 25 (L1) is connected to the first terminal 21 (T1) and the first connection terminal 17 (C1) on the low potential side. The second wire 25 (L2) is connected to the second terminal 21 (T2) and the second connection terminal 17 (C2) between the low potential side and the high potential side. The third wire 25 (L3) is connected to the third terminal 21 (T3) and the third connection terminal 17 (C3) between the low potential side and the high potential side. The fourth wire 25 (L4) is connected to the fourth terminal 21 (T4) and the fourth connection terminal 17 (C4) on the high potential side. It should be noted that the first connection terminal 17 (C1) in the processing unit 7 (7d) is set to a reference potential by, for example, the ground terminal G or the like.

[0058] The circuit board 9 (9d) of the fourth embodiment includes, for example, a first switching unit 27a that is set to be conductive (ON) on the first conductive line 25 (L1), a second switching unit 27b that is set to be non-conductive (OFF) between the first conductive line 25 (L1) and the second conductive line 25 (L2), and a third switching unit 27c that is set to be conductive (ON) on the third conductive line 25 (L3). The first switching unit 27a, the second switching unit 27b, and the third switching unit 27c form, for example, a first switching module 27.

[0059] The first switching module 27 of the fourth embodiment can prevent short circuits between the wires 25 adjacent in potential order and appropriately generate voltages of the battery cells 11 between the detection terminals 19 adjacent in potential order when the storage module 3 appropriately corresponding to the processing unit 7 (7d) is connected. Figure 5The illustrated power storage module 3 includes k battery cells 11 (m is a predetermined number, k is a predetermined number) which is the same as the number of channels (m-1) in the processing unit 7, and is appropriately connected to the circuit board 9 (9d).

[0060] Figure 6 It is a diagram showing a fifth example of the combination of the circuit board 9 (9e) and the processing unit 7 (7e) in the battery cell voltage detection device 10 according to the embodiment.

[0061] Figure 6 The fifth embodiment shown represents the structure of the circuit substrate 9 (9e) in the case where there is a connection terminal 17 (NC) that is not connected to any detection terminal 19 and does not participate in the voltage detection performed by the processing unit 7 (7e), for example because the specified number m in the processing unit 7 is less than the specified number n.

[0062] like Figure 6 As shown, the circuit board 9 (9e) of the fifth embodiment includes, for example, a first wire 25 (L1), a second wire 25 (L2), ..., an (n-1)th wire 25 (Ln-1), and an nth wire 25 (Ln) arranged in sequence from the low potential side to the high potential side. The first wire 25 (L1) is connected to the first terminal 21 (T1) and the first connection terminal 17 (C1) on the low potential side. The second wire 25 (L2), ..., and the (n-1)th wire 25 (Ln-1) are connected to the second terminal 21 (T2), ..., the (n-1)th terminal 21 (Tn-1), and the connection terminal 17 (NC) between the low potential side and the high potential side. The nth wire 25 (Ln) is connected to the nth terminal 21 (Tn) and the second connection terminal 17 (C2) on the high potential side. It should be noted that the first connection terminal 17 (C1) in the processing unit 7 (7e) is set to a reference potential, for example, by the ground terminal G or the like.

[0063] The circuit board 9 (9e) of the fifth embodiment, for example, includes a first switching module 27 and (n-4) second switching modules 29. The first switching module 27 is, for example, provided on the (n-3)th conductor 25 (Ln-3), the (n-2)th conductor 25 (Ln-2), and the (n-1)th conductor 25 (Ln-1). The (n-4) second switching module 29 is provided on the first conductor 25 (L1), the second conductor 25 (L2), ..., the (n-4)th conductor 25 (Ln-4).

[0064] The number of second switching modules 29, the number of connection terminals 17 (NC) not involved in the voltage detection by the processing unit 7 (7e), and the number of single battery cells 11 corresponding to the specified withstand voltage of the processing unit 7 (7e) are related. For example, when the processing unit 7 (7e) has N (N is an arbitrary natural number) connection terminals 17 (NC) and the number of single battery cells 11 corresponding to the specified withstand voltage of the processing unit 7 (7e) is M (M is an arbitrary natural number less than the natural number N), the circuit board 9 (9e) has (NM) second switching modules 29.

[0065] The second switching module 29 includes a fourth switching portion 29a provided on the conductor 25 and a fifth switching portion 29b provided between the conductors 25 adjacent in order of potential. The fifth switching portion 29b is provided, for example, between the following two locations: the first location is between the fourth switching portion 29a in the conductor 25 provided with the fourth switching portion 29a and the processing unit 7, and the second location is between the fourth switching portion 29a in the conductor 25 adjacent on the high potential side and the processing unit 7. The fourth switching portion 29a and the fifth switching portion 29b respectively switch between conduction and non-conduction by, for example, switching between installation and non-installation of a so-called jumper resistor or switching based on opening and closing of a switch. The fourth switching portion 29a switches between conduction and non-conduction of the conductor 25, and the fifth switching portion 29b switches between conduction and non-conduction between the conductors 25 adjacent in order of potential.

[0066] The switching of conduction (ON) and non-conduction (OFF) of each switching part 27a, 27b, 27c, 29a, and 29b in the first switching module 27 and the second switching module 29 is set, for example, according to the difference in internal structure such as the connection state of multiple connection terminals 17 and multiple detection terminals 19 in the processing unit 7.

[0067] The first switching module 27 and the second switching module 29 of the fifth embodiment can prevent an overvoltage from being generated between the two detection terminals 19 even when the power storage module 3 that does not properly correspond to the processing unit 7 (7e) is erroneously connected. Figure 6 The power storage module 3 shown has k single battery cells 11 (m is a specified number, k is a specified number) which is greater than the number of channels (m-1) in the processing unit 7 (7e), and is in a state of being incorrectly connected to the circuit board 9 (9e). In this case, the first switching unit 27a and the fourth switching unit 29a are set to non-conduction (OFF), and the second switching unit 27b, the third switching unit 27c, and the fifth switching unit 29b are set to conduction (ON).

[0068] Figure 6The circuit board 9 (9e) shown prevents the generation of voltages based on three or more battery cells 11 between the two detection terminals 19, and generates a voltage (Vn-1+Vn-2) based on two battery cells 11. For example, the voltage (Vn-1+Vn-2) generated by two battery cells 11 is lower than the specified withstand voltage of the processing unit 7 (7e), and the voltage generated by three or more battery cells 11 is an overvoltage greater than the specified withstand voltage of the processing unit 7 (7c).

[0069] It should be noted that, in the case of a processing unit 9 in which all connection terminals 17 and detection terminals 19 are connected is installed relative to a circuit substrate 9 having a first switching module 27 and (n-4) second switching modules 29, the first switching unit 27a and the fourth switching unit 29a are set to be conductive (ON), and the second switching unit 27b, the third switching unit 27c and the fifth switching unit 29b are set to be non-conductive (OFF).

[0070] As described above, according to the battery cell voltage detection device 10 of the embodiment, the first switching unit 27a and the second switching unit 27b that switch between conduction and non-conduction are provided, thereby appropriately coping with the number of channels of voltage detection corresponding to the number of single battery cells 11 that the processing unit 7 can handle without changing the wiring pattern of the circuit body. For example, even when a storage module 3 having a number of single battery cells 11 greater than the number of channels of the processing unit 7 is connected by mistake, the first switching unit 27a and the second switching unit 27b can prevent the occurrence of abnormalities such as short circuits and overvoltages. It is possible to ensure versatility in appropriately handling a plurality of processing units 7 with different numbers of channels, and to prevent abnormalities from occurring even when a storage module 3 that does not appropriately handle the processing unit 7 is connected by mistake.

[0071] The number of second switching modules 29 composed of the fourth switching unit 29a and the fifth switching unit 29b that switch between conduction and non-conduction is set according to the number N of connection terminals 17 (NC) that do not participate in the voltage detection by the processing unit 7 and the number M of single battery cells 11 that are equivalent to the specified withstand voltage of the processing unit 7, thereby improving versatility. By providing (NM) second switching modules 29, it is possible to appropriately correspond to the number of channels for voltage detection of the processing unit 7, and even when the storage module 3 that does not appropriately correspond to the processing unit 7 is erroneously connected, it is possible to prevent abnormalities such as short circuits and overvoltages from occurring.

[0072] (Variation Example)

[0073] Hereinafter, a modification of the embodiment will be described. It should be noted that the same reference numerals are used for the same parts as those of the above-mentioned embodiment, and the description thereof will be omitted or simplified.

[0074] In the above-described embodiment, the predetermined withstand voltage of the processing unit 7 is larger than the voltage generated by two battery cells 11 and smaller than the voltage generated by three or more battery cells 11 , but the present invention is not limited thereto.

[0075] In this case, the second switching section 27 b is not limited to being provided between the conductive wires 25 adjacent in order of potential, and may be provided between the conductive wires 25 selected according to a predetermined withstand voltage of the processing section 7 .

[0076] The embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the scope of the main purpose of the invention. These embodiments and their variations are included in the scope and main purpose of the invention, and are also included in the invention recorded in the technical solution and its equivalent scope.

Claims

1. A battery cell voltage detection device, wherein: The battery cell voltage detection device comprises: a circuit body including a plurality of lead wires connected to a plurality of battery cells constituting the power storage module; and a processing unit connected to the circuit body to detect the voltage of each of the plurality of battery cells; The circuit body comprises: at least one first switching unit, which is provided on at least one of the specified conducting wires to switch between conduction and non-conduction; and At least one second switching unit switches between conduction and non-conduction between the following two parts, the first part is between the first switching unit and the processing unit in the conductor where the first switching unit is provided, and the second part is at least one specified conductor selected according to the specified withstand voltage of the processing unit.

2. The battery cell voltage detection device according to claim 1, wherein: The processing unit comprises: A first terminal connected to the first said wire at a low potential side; a second terminal connected to the second said wire on a high potential side; and N terminals, which are connected to N different wires between the first terminal and the second terminal in the potential sequence and do not participate in the voltage detection performed by the processing unit, wherein N is an arbitrary natural number, When the number of the battery cells corresponding to the predetermined withstand voltage is M, the circuit body includes (NM) switching modules, wherein M is an arbitrary natural number less than the natural number N. The switching module has: a conductor switching unit that switches between conduction and non-conduction of the conductor on the lower potential side of two conductors adjacent in order of potential; and The conductor switching unit switches between conduction and non-conduction between the two conductors.

3. The battery cell voltage detection device according to claim 1 or 2, wherein: The circuit body includes a third switch provided on the conductive line adjacent to the conductive line on the highest potential side connected to the second switch to switch between conduction and non-conduction.

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