JP6996338B2 - Power supply - Google Patents

Description

The present disclosure relates to a power supply unit having a plurality of assembled batteries.

Conventionally, in a power supply device including a plurality of assembled batteries, the plurality of assembled batteries may be connected by a connecting member such as a bus bar. In such a power supply device, the voltage of each set battery is monitored by using a voltage detection device. For example, Japanese Patent Application Laid-Open No. 2011-253721 (Patent Document 1) discloses a voltage monitoring device that monitors the voltage of each group divided into two or more in a plurality of fuel cells.

Japanese Unexamined Patent Publication No. 2011-253721

When a plurality of assembled batteries are connected to each other by using a connecting member as described above, the connecting member may be fastened to the terminal of each assembled battery by using, for example, a bolt or the like. In such a case, if the bolts or the like are loosely fastened, the conduction resistance of the connecting member may increase. As a result, the temperature of the connecting member may rise unnecessarily. Therefore, it is conceivable to detect the power consumed in the connecting member by detecting the voltage applied to the connecting member, but it may not be possible to determine whether or not the detected voltage is a normally detected voltage. .. In the above-mentioned Patent Document 1, no consideration is given to such a problem.

The present disclosure has been made to solve the above-mentioned problems, and an object thereof is whether or not the detection result of the voltage applied to the connecting member connecting a plurality of assembled batteries is a normal detection result. It is to provide a power supply device which makes a judgment with high accuracy.

The power supply device according to a certain aspect of the present disclosure includes a battery including a first set battery, a second set battery, and a connecting member for connecting the first set battery and the second set battery in series, and one end of the connecting member. A first detection unit that detects the voltage between the ends between the unit and the other end, a second detection unit that detects the current flowing through the battery, and a third detection unit that detects the environmental temperature around the battery. The power in the connection member is calculated using the fourth detector that detects the temperature of the connection member, the voltage between the ends, and the current, and the calculated power, the environmental temperature, the power, the environmental temperature, and the temperature of the connection member. The temperature of the connecting member is acquired using a predetermined relationship with, and the first detecting unit uses the comparison result between the acquired temperature of the connecting member and the temperature of the connecting member detected by the fourth detecting unit. It is provided with a determination unit for determining whether or not the detection result by the above is a normal detection result.

By doing so, the detection result by the first detection device is obtained by using the comparison result between the temperature of the connection member detected by the fourth detection device and the temperature of the connection member acquired from the voltage, the current and the environmental temperature. Whether or not the detection result is normal can be determined with high accuracy.

According to the present disclosure, it is possible to provide a power supply device that accurately determines whether or not a voltage detection result relating to a connecting member connecting a plurality of assembled batteries is a normal detection result.

It is a figure which shows the whole structure of the power supply device which concerns on this embodiment. It is a figure for demonstrating an example of the connection structure between a plurality of assembled batteries. It is a flowchart which shows the process executed by a control device.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals and the description thereof will not be repeated.

FIG. 1 is a diagram showing an overall configuration of a power supply device 1 according to the present embodiment. As shown in FIG. 1, the power supply device 1 according to the present embodiment includes a control device 10, a battery 20, a voltage measuring unit 30, an environmental temperature sensor 40, a bus bar temperature sensor 42, and a current sensor 50. Be prepared.

In the present embodiment, the battery 20 is, for example, a battery mounted on a vehicle or the like. The battery 20 supplies power to an electrical load (not shown). The electrical load includes, for example, a power converter such as an inverter or a converter, and a motor generator that can be a power source for the vehicle.

The battery 20 includes a plurality of assembled batteries. In the present embodiment, the battery 20 includes a first set battery 22, a bus bar 24a, 24b, 24c, a second set battery 26, a third set battery 28a, and a fourth set battery 28b. The number of assembled batteries included in the battery 20 is not particularly limited to four. The assembled battery may be composed of the same number of battery cells, or may be composed of a different number of battery cells.

The first set battery 22 includes a plurality of battery cells. In the present embodiment, the first set battery 22 has a configuration in which a predetermined number of battery blocks 22b in which a predetermined number (for example, three in the present embodiment) of battery cells are connected in parallel are connected in series. ..

The second set battery 26 includes a plurality of battery cells. In the present embodiment, the second set battery 26 has a configuration in which a predetermined number of battery blocks 26b in which a predetermined number (for example, three in the present embodiment) of battery cells are connected in parallel are connected in series. ..

The third set battery 28a and the fourth set battery 28b have the same configuration as the first set battery 22. Therefore, those detailed explanations will not be repeated.

The first set battery 22 and the second set battery 26 are connected in series by the bus bar 24a. The bus bar 24a is energized so as to be able to connect, for example, an electrode terminal (for example, a negative electrode terminal) of the first set battery 22 and an electrode terminal (for example, a positive electrode terminal) having the opposite polarity of the second set battery 26. It is a possible connection member. The bus bar 24a may be configured to connect the positive electrode terminal of the first set battery 22 and the negative electrode terminal of the second set battery 26.

Similarly, the second set battery 26 and the third set battery 28a are connected in series by the bus bar 24b. Further, the third set battery 28a and the fourth set battery 28b are connected in series by the bus bar 24c. The connection configuration between the second set battery 26 and the third set battery 28a by the bus bar 24b and the connection configuration between the third set battery 28a and the fourth set battery 28b by the bus bar 24c are both the first set battery 22 by the bus bar 24a and the connection configuration. The connection configuration with the second set battery 26 is the same. Therefore, those detailed explanations will not be repeated.

FIG. 2 is a diagram for explaining an example of a connection configuration between a plurality of assembled batteries. As shown in FIG. 2, the first set battery 22 includes a predetermined number of battery blocks 22b, a plurality of inter-block bus bars 22c, and a terminal bus bar 22d.

The battery block 22b includes a plurality of battery cells 22a. In the present embodiment, the battery block 22b is configured by arranging three square battery cells 22a in a row. In the battery block 22b, the battery cell 22a has the surface on which the positive electrode terminal and the negative electrode terminal are provided as the upper surface, and the rectangular side of the upper surface in the longitudinal direction is the longitudinal side of the upper surface of the adjacent battery cell 22a in the rectangular shape. They are arranged so that they face each other.

The battery block 22b is connected in series with the adjacent battery block 22b by the inter-block bus bar 22c. Specifically, the inter-block bus bar 22c is connected to each of the electrode terminals (for example, positive electrode terminals) having the same polarity in the three battery cells 22a included in the battery block 22b. Further, the inter-block bus bar 22c is an electrode terminal having the same polarity in the three battery cells 22a included in the adjacent battery block 22b, and has an electrode terminal having a polarity different from that of the battery block 22b to which the block is connected. For example, it is connected to each of the negative electrode terminals). In this way, the inter-block bus bar 22c connects the three battery cells 22a in parallel in the battery block 22b and connects them in series with the adjacent battery blocks 22b. The inter-block bus bar 22c and the battery cell 22a are connected by fastening with bolts, nuts, or the like, for example.

In the three battery cells 22a included in the battery block 22b arranged at the end of the plurality of battery blocks 22b, the inter-block bus bar 22c is connected to each of one of the electrode terminals. A terminal bus bar 22d is connected to each of the electrode terminals at the other end. Each of the electrode terminals of the three battery cells 22a is connected to one end side of the terminal bus bar 22d, and one end of the bus bar 24a is connected to the other end of the terminal bus bar 22d. The terminal bus bar 22d and the battery cell 22a are connected by fastening with bolts, nuts, or the like, for example. The terminal bus bar 22d and the bus bar 24a are connected by, for example, fastening with bolts, nuts, or the like. The terminal bus bar 22d shown in FIG. 2 corresponds to the negative electrode terminal of the first set battery 22.

The second set battery 26 includes a predetermined number of battery blocks 26b, a plurality of inter-block bus bars 26c, and a terminal bus bar 26d. Further, the battery block 26b includes a plurality of battery cells 26a. The configuration of the second set battery 26 is the same as the configuration of the first set battery 22. Further, the configurations of the third set battery 28a and the fourth set battery 28b are the same as the configurations of the first set battery 22. Therefore, those detailed explanations will not be repeated.

Each of the electrode terminals of the three battery cells 26a is connected to one end side of the terminal bus bar 26d, and the other end of the bus bar 24a is connected to the other end of the terminal bus bar 26d. The terminal bus bar 26d and the bus bar 24a are connected by fastening using, for example, bolts or nuts. The terminal bus bar 26d shown in FIG. 2 corresponds to the positive electrode terminal of the second set battery 26.

The bus bar 24b has the same configuration as the bus bar 24a, except that the connection destinations of the plurality of assembled batteries are the second assembled battery 26 and the third assembled battery 28a. Further, the bus bar 24c has the same configuration as the bus bar 24a, except that the connection destinations of the plurality of assembled batteries are the third assembled battery 28a and the fourth assembled battery 28b. Therefore, those detailed explanations will not be repeated.

Returning to FIG. 1, the voltage measuring unit 30 detects the voltage and the like of each of the plurality of battery blocks 22b and 26b of the battery 20. Further, the voltage measuring unit 30 detects the voltage of each of the plurality of battery blocks (not shown) of the third set battery 28a and the plurality of battery blocks (not shown) of the fourth set battery 28b.

The positive electrode terminal of the first set battery 22, between the adjacent battery blocks 22b, the negative electrode terminal of the first set battery 22, the positive electrode terminal of the second set battery 26, between the adjacent battery blocks 26b, and the second set battery 26. One end of each of the plurality of wires is connected to the negative electrode terminal of the above.

Further, between the positive electrode terminal of the third set battery 28a, between the battery blocks of the third set battery 28a, the negative electrode terminal of the third set battery 28a, the positive electrode terminal of the fourth set battery 28b, between the battery blocks of the fourth set battery 28b, and the first. One end of each of the plurality of wires is connected to the negative electrode terminal of the 4-set battery 28b. The other end of each of the plurality of wires is connected to an input unit (not shown) of the voltage measuring unit 30.

The voltage measuring unit 30 uses these plurality of wirings to obtain the respective voltages of the plurality of battery blocks 22b and 26b, the respective voltages of the plurality of battery blocks of the third group battery 28a, and the plurality of the fourth group batteries 28b. And the voltage Vbb (1) between the ends of the bus bar 24a (more specifically, between the negative terminal of the first set battery 22 and the positive terminal of the second set battery 26). , The voltage Vbb (2) between the ends of the bus bar 24b (more specifically, between the negative terminal of the second set battery 26 and the positive terminal of the third set battery 28a) and between the ends of the bus bar 24c (more specifically). More specifically, the voltage Vbb (2) between the negative terminal of the third set battery 28a and the positive terminal of the fourth set battery 28b) is detected. The voltage measuring unit 30 includes the detected voltages of the plurality of battery blocks 22b and 26b, the voltage of each of the plurality of battery blocks of the third set battery 28a, and each of the plurality of battery blocks of the fourth set battery 28b. And the voltage between the ends Vbb (1), Vbb (2), Vbb (3) are transmitted to the control device 10.

The environmental temperature sensor 40 detects the ambient temperature (hereinafter referred to as the environmental temperature) TB of the battery 20. The environmental temperature sensor 40 transmits a signal indicating the detected environmental temperature TB to the control device 10.

The bus bar temperature sensor 42 detects the temperature (hereinafter, referred to as the bus bar temperature) Tbb of the bus bar 24a. The bus bar temperature sensor 42 transmits a signal indicating the detected bus bar temperature Tbb to the control device 10.

The current sensor 50 detects the current Ib flowing through the battery 20. The current sensor 50 transmits a signal indicating the detected current Ib to the control device 10.

The control device 10 includes a calculation unit 12 and a storage unit 14. The calculation unit 12 includes, for example, a CPU (Central Processing Unit) configured to be able to execute a predetermined calculation process based on information such as a program stored in the storage unit 14.

The storage unit 14 includes various types of memory such as a ROM (Read Only Memory) or a RAM (Random Access Memory), for example.

The control device 10 receives various signals from the voltage measuring unit 30, the environmental temperature sensor 40, the bus bar temperature sensor 42, and the current sensor 50, and controls the power input to / from the battery 20 based on the received various signals. The control device 10 controls the power input / output to / from the battery 20 by controlling the power conversion device described above, for example.

In the power supply device 1 having the above configuration, for example, if the bus bar 24a and the terminal bus bar 22d are fastened to each other or the bus bar 24a and the terminal bus bar 26d are loosened, the conduction resistance in the bus bar 24a becomes high. May be. As a result, the temperature of the bus bar 24a may rise unnecessarily. In particular, since the energizing current is large in a high-voltage battery, the temperature rise may be large. Therefore, it is conceivable to detect the power consumed in the bus bar 24a by detecting the voltage applied to the bus bar 24a (voltage between ends Vbb (1)), but the voltage between ends detected by the voltage measuring unit 30. It may not be possible to determine whether or not Vbb (1) is a normally detected voltage. In particular, since the bus bar 24a is not necessarily large enough to ensure sufficient measurement accuracy and a stable voltage is applied to the bus bar 24a, the detected end-to-end voltage Vbb (1) is normally detected. It is required to judge with high accuracy whether or not it is.

Therefore, in the present embodiment, it is assumed that the control device 10 performs the following operations. That is, the control device 10 calculates the electric power Pbb (1) in the bus bar 24a by using the end-to-end voltage Vbb (1) and the current Ib. The control device 10 uses a predetermined relationship between the calculated electric power Pbb (1), the environmental temperature TB, the electric power Pbb (1), the environmental temperature TB, and the allowable temperature Tbb_limit of the bus bar temperature Tbb, and the bus bar temperature Tbb. The permissible temperature Tbb_limit of is acquired. In the control device 10, the detection result by the voltage measuring unit 30 is normal using the comparison result between the allowable temperature Tbb_limit of the bus bar temperature Tbb acquired as described above and the bus bar temperature Tbb detected by the bus bar temperature sensor 42. Determine if it is a detection result.

In this way, the comparison result between the bus bar temperature Tbb detected by the bus bar temperature sensor 42 and the allowable temperature Tbb_limit of the bus bar temperature Tbb acquired by using the voltage Vbb (1), the current Ib, and the environmental temperature TB is used. Therefore, it is possible to accurately determine whether or not the detection result by the voltage measuring unit 30 is a normal detection result.

Hereinafter, the control process executed by the control device 10 of the power supply device 1 according to the present embodiment will be described with reference to FIG. FIG. 3 is a flowchart showing a process executed by the control device 10. The process shown in this flowchart is called and executed from the main routine (not shown) at predetermined control cycles. Each step included in these flowcharts is basically realized by software processing by the arithmetic unit 12, but a part or all thereof is realized by hardware (electric circuit) manufactured in the control device 10. You may.

At step 100 (hereinafter, step is referred to as S) 100, the control device 10 acquires the voltage between ends Vbb (1) to Vbb (3) from the voltage measuring unit 30.

In S102, the control device 10 acquires the current Ib from the current sensor 50. In S104, the control device 10 multiplies each of the end-to-end voltages Vbb (1) to Vbb (3) by the current Ib to consume power Pbb (1) to Pbb (1) to Pbb (in each of the bus bars 24a, 24b, 24c). 3) is calculated.

In S106, the control device 10 sets an allowable value ΔP based on the current Ib. The permissible value ΔP indicates the permissible value of the variation in the power consumptions Pbb (1) to Pbb (3). The control device 10 sets an allowable value ΔP using the current Ib acquired in S102 and a predetermined map. The predetermined map is a map showing the relationship between the current Ib and the permissible value ΔP, and is adapted by experiments or the like and created in advance.

In S108, the control device 10 sets the largest value among the calculated power consumptions Pbb (1) to Pbb (3) as the maximum value Pbb_max. The control device 10 sets the smallest value among the calculated power consumptions Pbb (1) to Pbb (3) as the minimum value Pbb_min.

In S110, the control device 10 determines whether or not the value obtained by subtracting the minimum value Pbb_min from the maximum value Pbb_max is larger than the allowable value ΔP. By this process, it is determined whether or not the power consumption variation in each bus bar is large. When it is determined that the value obtained by subtracting the minimum value Pbb_min from the maximum value Pbb_max is larger than the allowable value ΔP (YES in S110), the process is transferred to S112.

In S112, the control device 10 acquires the bus bar temperature Tbb from the bus bar temperature sensor 42. In S114, the control device 10 sets an allowable temperature Tbb_limit based on the power consumption Pbb (1) and the environmental temperature TB. The control device 10 sets the allowable temperature Tbb_limit using the power consumption Pbb (1) calculated in S104, the environmental temperature TB, and a predetermined map. As the allowable temperature Tbb_limit, for example, the upper limit of the temperature range of the bus bar temperature Tbb, which is the temperature allowed in the bus bar 24a and is assumed from the power consumption (calorific value) and the environmental temperature, is set. The predetermined map is a map showing the relationship between the power consumption Pbb (1), the environmental temperature TB, and the allowable temperature Tbb_limit, and is experimentally or designedly adapted and created in advance.

In S116, the control device 10 determines whether or not the bus bar temperature Tbb is higher than the allowable temperature Tbb_limit. When it is determined that the bus bar temperature Tbb is higher than the allowable temperature Tbb_limit (YES in S116), the process is transferred to S118. In S118, the control device 10 determines that the detection result of the end-to-end voltage Vbb (1) by the voltage measuring unit 30 is not a normal detection result. When the detection result of the end-to-end voltage Vbb (1) by the voltage measuring unit 30 is determined to be not a normal detection result, the control device 10 may notify the user to that effect, or the voltage. A flag indicating the occurrence of a measurement abnormality in the measuring unit 30 may be set to the ON state.

When it is determined that the value obtained by subtracting the minimum value Pbb_min from the maximum value Pbb_max is equal to or less than the allowable value ΔP (NO in S110), this process is terminated. When it is determined that the bus bar temperature Tbb is equal to or lower than the allowable temperature Tbb_limit (NO in S116), the process is transferred to S120. In S120, the control device 10 determines that at least one of the bus bars 24a, 24b, and 24c is in an abnormal state of fastening (an abnormal state such as looseness in fastening). When it is determined that any of the bus bars is in the abnormal fastening state, the control device 10 may notify the user to that effect, and sets a flag indicating the occurrence of the abnormal fastening state to the on state. Alternatively, the control for reducing the current flowing through the battery 20 to the threshold value or less may be executed.

The operation of the power supply device 1 based on the above structure and the flowchart will be described. For example, assume that power is supplied from the battery 20 to the electric load.

When the voltage between ends Vbb (1) to Vbb (3) is acquired from the voltage measuring unit 30 (S100) and the current Ib is acquired from the current sensor 50 (S102), the acquired voltage between ends Vbb (1) ) To Vbb (3) and the current Ib are multiplied to calculate the power consumption Pbb (1) to Pbb (3) (S104).

On the other hand, the permissible value ΔP is set based on the current Ib using a map or the like (S106). From the calculated power consumption Pbb (1) to Pbb (3), the maximum value Pbb_max and the minimum value Pbb_min are set (S108). When it is determined that the value obtained by subtracting the minimum value Pbb_min from the maximum value Pbb_max is larger than the allowable value ΔP (S110), the bus bar temperature Tbb is acquired from the bus bar temperature sensor 42 (S112).

The permissible temperature Tbb_limit is set using the power consumption Pbb (1), the environmental temperature TB, and a predetermined map (S114), and the bus bar temperature Tbb detected by the bus bar temperature sensor 42 is higher than the permissible temperature Tbb_limit. Whether or not it is determined (S116). When it is determined that the bus bar temperature Tbb is higher than the allowable temperature Tbb_limit (YES in S116), it is determined that the detection result of the end-to-end voltage Vbb (1) by the voltage measuring unit 30 is not a normal detection result (S118). ).

On the other hand, when it is determined that the bus bar temperature Tbb detected by the bus bar temperature sensor 42 is equal to or lower than the allowable temperature Tbb_limit (NO in S116), the detection result of the end-to-end voltage Vbb (1) by the voltage measuring unit 30 is normal. Therefore, it is determined that at least one of the bus bars 24a, 24b, and 24c is in a fastening abnormal state (S120).

As described above, according to the power supply device 1 according to the present embodiment, the comparison result between the bus bar temperature Tbb detected by the bus bar temperature sensor 42 and the allowable temperature Tbb_limit obtained from the power consumption Pbb and the environmental temperature TB. Can be used to accurately determine whether or not the detection result by the voltage measuring unit 30 is a normal detection result. Therefore, it is possible to provide a power supply device that accurately determines whether or not the voltage detection result of the connecting member connecting the plurality of assembled batteries is a normal detection result.

Further, the voltage detection result is a normal detection result with an inexpensive configuration as compared with the case where the same end-to-end voltage is detected multiple times to determine whether or not the voltage detection result is a normal detection result. It can be determined whether or not.

Hereinafter, modification examples will be described.
In the above-described embodiment, the bus bar has been described as an example as a connecting member for connecting the assembled batteries in series, but a cable may be used, for example.

Further, in the above-described embodiment, the first set battery 22 and the second set battery 26 are each configured by connecting a predetermined number of battery blocks 22b and 26b in which three battery cells are connected in parallel in series. However, the number of battery cells connected in parallel is not limited to three, and may be two or four or more. Alternatively, the first set battery 22 and the second set battery 26 may be configured by connecting a predetermined number of battery cells in series.

Further, in the above-described embodiment, when the power consumption of the bus bars 24a, 24b, 24c varies widely and the bus bar temperature Tbb is equal to or lower than the allowable temperature Tbb_limit, any one of the bus bars 24a, 24b, 24c is used. Although it has been described as determining that the fastening is in an abnormal state, for example, when there is a large variation in the amount of power consumption per unit time in the bus bars 24a, 24b, 24c and the bus bar temperature Tbb is equal to or less than the allowable temperature Tbb_limit. , Any one of the bus bars 24a, 24b, and 24c may be determined to be in a fastening abnormal state.

Further, in the above-described embodiment, it has been described as determining whether or not the variation in power consumption in the bus bars 24a, 24b, 24c is large, but instead of the power consumption, the variation in conduction resistance in the bus bars 24a, 24b, 24c is described. It may be determined whether it is large or not. The control device 10 may calculate the conduction resistance in the bus bars 24a, 24b, 24c using, for example, the current Ib and the voltage between the ends Vbb (1) to Vbb (3).

Further, in the above-described embodiment, the configuration in which the bus bar temperature sensor 42 is provided only in the bus bar 24a has been described as an example. However, for example, instead of the bus bar 24a, the bus bar 24b or the bus bar 24c may be provided with the bus bar temperature sensor 42. Alternatively, the bus bar temperature sensor may be provided in at least two of the bus bar 24a, the bus bar 24b, and the bus bar 24c. When a plurality of bus bar temperature sensors are provided, the largest detected value among the plurality of detected values may be acquired as the bus bar temperature Tbb.

Further, in the above-described embodiment, the upper limit of the temperature range of the temperature Tbb of the bus bar 24a assumed from the power consumption and the environmental temperature is set as the allowable temperature Tbb_limit and compared with the temperature Tbb of the bus bar 24a detected by the bus bar temperature sensor 42. When the temperature Tbb of the bus bar 24a detected by the bus bar temperature sensor 42 is larger than the allowable temperature Tbb_limit, it is determined that the detection result of the end voltage Vbb (1) by the voltage measuring unit 30 is not a normal detection result. As described above, the configuration is not limited to this. For example, an estimated value of the temperature Tbb of the bus bar 24a assumed from the power consumption and the environmental temperature is set, and the set estimated value is compared with the temperature Tbb of the bus bar 24a detected by the bus bar temperature sensor 42, for example. When the temperature Tbb of the bus bar 24a detected by the bus bar temperature sensor 42 is larger than a predetermined value by a predetermined value or more, it is determined that the detection result of the end voltage Vbb (1) by the voltage measuring unit 30 is not a normal detection result. May be good.

Further, in the above-described embodiment, when it is determined that the variation in power consumption in the bus bars 24a, 24b, 24c is large, the temperature Tbb of the bus bar 24a detected by the bus bar temperature sensor 42 and the allowable temperature Tbb_limit are compared. However, the temperature Tbb of the bus bar 24a detected by the bus bar temperature sensor 42 and the permissible temperature Tbb_limit may be compared regardless of the variation in the power consumption of the bus bars 24a, 24b, 24c.

In addition, the above-mentioned modification may be carried out by appropriately combining all or a part thereof.
It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present disclosure is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 power supply, 10 controller, 12 arithmetic unit, 14 storage unit, 20 battery, 22 first set battery, 22a, 26a battery cell, 22b, 26b battery block, 22c, 26c block-to-block bus bar, 22d, 26d terminal bus bar, 24, 24a, 24b, 24c bus bar, 26 2nd set battery, 28a 3rd set battery, 28b 4th set battery, 30 voltage measuring unit, 40 environmental temperature sensor, 42 bus bar temperature sensor, 50 current sensor.

Claims (1)

A battery including a first set battery, a second set battery, and a connecting member for connecting the first set battery and the second set battery in series.
A first detection unit that detects an end-to-end voltage between one end and the other end of the connecting member,
A second detection unit that detects the current flowing through the battery,
A third detection unit that detects the environmental temperature around the battery,
A fourth detector that detects the temperature of the connecting member,
The electric power in the connecting member is calculated using the voltage between the ends and the current, and the calculated electric power, the environmental temperature, the electric power, the environmental temperature, and the temperature of the connecting member are predetermined. The temperature of the connecting member is acquired using the above relationship, and the first detection unit uses the comparison result between the acquired temperature of the connecting member and the temperature of the connecting member detected by the fourth detection unit. A power supply device including a determination unit for determining whether or not the detection result by the above is a normal detection result.

Images