JP2022078382A - Power supply device - Google Patents

Abstract

To place a plurality of voltage detection lines in an ideal position easily by wiring the voltage detection lines using a seat heater, and easily, and place the voltage detection lines in correct positions for achieving high safety.SOLUTION: A power supply device includes a battery block 10 composed of a plurality of battery cells 1 having a positive electrode 1A and a negative electrode 1B at both ends, a voltage detection circuit 30 that detects a voltage of the battery cell 1, a voltage detection line 31 formed by electrically connecting the voltage detection circuit 30 to the electrodes of the battery cell 1, and a seat heater 3 that heats the battery cell 1, and the voltage detection line 31 is connected to the seat heater 3.SELECTED DRAWING: Figure 2

Description

The present invention relates to a power supply device including a plurality of battery cells and including a voltage detection circuit for detecting the voltage of the battery cells.

In a power supply device including a plurality of battery cells, the battery cells are connected in series in order to increase the output voltage. This power supply device charges the battery cells connected in series with the same current and discharges them with the same current, but when the battery cells are repeatedly charged and discharged, a voltage difference is generated in each battery cell, resulting in an imbalance. An imbalance in a battery cell causes the battery to deteriorate due to overcharging or overdischarging a specific battery cell. In addition, when a specific battery cell has an abnormally high voltage, it may be a cause of impairing safety. In order to prevent this adverse effect, a power supply device has been developed that detects the voltage of each battery cell and eliminates the imbalance. (See Patent Document 1)

Japanese Unexamined Patent Publication No. 2009-205973

In a conventional power supply device, one end of a voltage detection line is connected to a lead plate connected to a battery cell, this voltage detection line is connected to the input side of the voltage detection circuit, and each battery cell is provided with a voltage detection circuit. The voltage of is detected. A power supply device in which a plurality of battery cells are connected in series has a voltage detection line on the electrode of each battery cell connected in series in order to detect the voltage of each battery cell connected in series by a voltage detection circuit. You are connected. Therefore, in a power supply device in which a plurality of battery cells are connected in series, it is necessary to connect a plurality of voltage detection lines to the battery cell and the voltage detection circuit. The power supply device provides a wiring space in a case that houses a large number of parts in order to wire a plurality of voltage detection lines. However, since it is important to miniaturize the outer shape of the power supply device without exception, it is difficult to provide a sufficient wiring space, and the actual situation is that a plurality of voltage detection lines are arranged in a narrow space. Therefore, wiring the voltage detection line is troublesome, and wiring the voltage detection line in a narrow space is a cause of hindering ensuring high safety. This is because damage to the insulating film of the voltage detection line causes a short circuit. In particular, since the voltage detection wire is connected to the positive and negative electrodes of the battery cell, the insulating film is damaged by vibration or impact, the core wire is exposed, and when it comes into contact with the lead plate or the conductive part of the battery cell, a large short current is generated. It may flow, lower the electrical characteristics of the battery cell, and further impair safety.

The present invention has been further developed for the purpose of eliminating the above-mentioned drawbacks of the conventional power supply device, and one of the purposes of the present invention is to wire a voltage detection line using a seat heater. It is an object of the present invention to provide a power supply device capable of achieving high safety by arranging a plurality of voltage detection lines in an ideal arrangement, easily and easily, and accurately arranging the voltage detection lines in a fixed position.

The power supply device according to an aspect of the present invention includes a battery block composed of a plurality of battery cells provided with positive and negative electrodes at both ends, a voltage detection circuit for detecting the voltage of the battery cells, and a voltage detection circuit for the battery cells. It is a power supply device including a voltage detection line electrically connected to an electrode and a seat heater for heating a battery cell, and the voltage detection line is connected to the seat heater.

In the above power supply device, by wiring the voltage detection lines using the seat heater provided to heat the battery cells, a plurality of voltage detection lines can be arranged in an ideal arrangement, easily and easily. It has the feature that it can be wired accurately in place to ensure high safety.

It is a schematic block diagram of the power supply device which concerns on one Embodiment of this invention. It is a schematic plan view which shows the battery block and the seat heater of the power supply device which concerns on one Embodiment of this invention. It is a schematic sectional drawing of the power supply device which concerns on one Embodiment of this invention. FIG. 3 is a plan view showing a battery block of the power supply device shown in FIG. It is an enlarged sectional view which shows the part which connects the connection part of the voltage detection line drawn out from a seat heater to a lead plate.

Hereinafter, the present invention will be described in detail with reference to the drawings. In the following description, terms indicating a specific direction or position (for example, "upper", "lower", and other terms including those terms) are used as necessary, but the use of these terms is used. The purpose is to facilitate understanding of the invention with reference to the drawings, and the meaning of these terms does not limit the technical scope of the present invention. Further, the parts having the same reference numerals appearing in a plurality of drawings indicate the same or equivalent parts or members.
Further, the embodiments shown below show specific examples of the technical idea of the present invention, and do not limit the present invention to the following. In addition, the dimensions, materials, shapes, relative arrangements, etc. of the components described below are not intended to limit the scope of the present invention to the specific description, but are exemplified. It was intended. Further, the contents described in one embodiment and the embodiment can be applied to other embodiments and the embodiments. In addition, the size and positional relationship of the members shown in the drawings may be exaggerated in order to clarify the explanation.

The power supply device according to the first aspect of the present invention includes a battery block composed of a plurality of battery cells provided with positive and negative electrodes at both ends, a voltage detection circuit for detecting the voltage of the battery cells, and a voltage detection circuit and a battery cell. It is a power supply device including a voltage detection line electrically connected to the electrodes of the above and a seat heater for heating the battery cell, and the voltage detection line is connected to the seat heater.

In the above power supply device, both the heater line and the voltage detection line are wired to the seat heater that heats the battery cell, so a plurality of voltage detection lines required to detect the voltage of the battery cell are wired. By arranging the seat heater in a fixed position, the voltage detection line can be arranged in an accurate position via the seat heater. Therefore, there is a feature that the voltage detection lines can be accurately arranged at ideal positions while eliminating the trouble of wiring a large number of voltage detection lines. In particular, in the assembly process, the operator does not need to place the voltage detection line in a specific position, so all the voltage detection lines can be placed in a simple and accurate position without being affected by the technical level of the operator. Can be placed in. Further, since the voltage detection line is arranged at a fixed position via the seat heater, there is a feature that high safety can be realized by suppressing adverse effects such as the voltage detection line being misaligned and short-circuited.

In the power supply device according to the second aspect of the present invention, the seat heater has a flexible insulating base sheet, a heater wire connected to the base sheet, and a voltage connected to the base sheet. It has a detection line.

In the above power supply device, since the voltage detection wire is connected to the insulating base sheet and wired, the voltage detection wire can be wired at an accurate position in an ideal insulated state, and higher safety can be ensured.

In the power supply device according to the third aspect of the present invention, the base sheet is a non-woven fabric. Further, in the power supply device according to the fourth aspect of the present invention, a voltage detection line is sewn on a base sheet. This power supply device can realize higher safety by reliably wiring the voltage detection line in an accurate position so as not to be displaced from the base sheet.

In the power supply device according to the fifth aspect of the present invention, the sheet heater includes an insulating sheet laminated on the base sheet, and the voltage detection wire and the heater wire are arranged between the base sheet and the insulating sheet.

In this power supply, the voltage detection line is sandwiched between the base sheet and the insulating sheet and placed in the correct position, so the voltage detection line is insulated in a more ideal state and placed in the fixed position for higher safety. Can be realized.

In the power supply device according to the sixth aspect of the present invention, the voltage detection line is connected to a lead plate connected to the electrode terminal of the battery cell, and is electrically connected to the electrode of the battery cell via the lead plate.

The power supply device of the seventh aspect of the present invention further comprises a temperature control circuit connected to the seat heater to control the power supply of the seat heater, and the temperature control circuit reduces the energization current of the seat heater to less than 10 Hz. The power supply is controlled by switching on and off at intervals.

The above power supply device can accurately detect the voltage of the battery cell by the voltage detection circuit while reducing the influence of the pulse noise generated by the seat heater while controlling the power supply of the seat heater with great efficiency.

The power supply device according to the eighth aspect of the present invention includes an A / D converter in which the voltage detection circuit detects the voltage of the battery cell and converts it into a digital signal, the A / D converter has a temperature control circuit, and the seat heater has a seat heater. The battery voltage is converted to a digital signal at a timing different from the switching timing for switching the current on and off.

In the above power supply device, the influence of the pulse noise generated by the seat heater can be made extremely small while controlling the power supply of the seat heater with great efficiency, and the voltage of the battery cell can be detected more accurately by the voltage detection circuit.

(Embodiment 1)
Since the power supply device of the present embodiment heats the battery cell with a seat heater, it is suitable for an electric device installed outdoors such as a base station where the usage environment is low. Furthermore, since the charge / discharge of the battery cell is controlled while detecting the voltage of the battery cell, each battery cell can be charged / discharged in an ideal state, and the battery cell becomes higher or lower than the set voltage. Since it detects and controls charge / discharge, it is suitable for applications that require high safety while suppressing deterioration of the electrical characteristics of the battery cell.

FIG. 1 shows a schematic block diagram of a power supply device, FIG. 2 is a schematic plan view of a seat heater laminated on a battery block of the power supply device, FIG. 3 is a schematic sectional view of the power supply device, and FIG. 4 is a battery block. The plan view is shown respectively. In the power supply device 100 of FIGS. 1 to 4, the battery block 10 is housed in the battery case 20. A seat heater 3 for heating the battery cell 1 is arranged on the surface of the battery block 10. The battery block 10 is composed of a plurality of core modules 9. Each core module 9 includes a plurality of battery cells 1. A plurality of battery cells 1 are connected in parallel by a lead plate 2. A plurality of core modules 9 are connected in series to form a battery block 10. The seat heater 3 is laminated on the lead plate 2 in a heat-bonded state, and heats the battery cell 1 via the lead plate 2. In the seat heater 3, both the heater wire 5 and the voltage detection wire 31 are insulated and wired to the base sheet 4 by a method such as sewing. The heater wire 5 is connected to the temperature control circuit 40 to heat the battery cell 1, and the voltage detection wire 31 is connected to the voltage detection circuit 30 to detect the voltage of the battery cell 1.

The seat heater 3 is controlled by the temperature control circuit 40 in an energized state to heat the battery cell 1. The temperature control circuit 40 includes a temperature sensor 41 that detects the temperature of the battery cell 1. The temperature control circuit 40 energizes the battery cell 1 to heat the battery cell 1 when the temperature of the battery cell 1 detected by the temperature sensor 41 becomes lower than a preset minimum temperature, for example, 5 ° C., and the battery cell 1 becomes a predetermined temperature. When the temperature rises to the set temperature, the energization is stopped. Further, the temperature control circuit 40 adjusts the power supply of the seat heater 3 with the temperature of the battery cell 1 to control the heated state of the battery cell 1. The temperature control circuit 40 controls the power supply of the seat heater 3 by turning on and off the switching element 42 connected in series with the seat heater 3 at a predetermined cycle.

The method in which the temperature control circuit 40 switches the switching element 42 on and off to control the supply power of the seat heater 3 causes transient pulse noise to be generated at the time of switching. In particular, the structure in which the voltage detection line 31 is wired close to the heater line 5 to the seat heater 3 causes pulse noise from the heater line 5 to be induced in the voltage detection line 31. This harmful effect has a low cycle for switching the switching element 42 on and off, for example, by switching the switching element 42 on and off at a cycle lower than 10 Hz, the harmful effect due to the induction of pulse noise from the heater wire 5 to the voltage detection line 31 is suppressed. can. By lowering the on / off cycle, the pulse noise generated in a unit time is reduced, and the pulse noise generation time is shortened with respect to the time when the pulse noise does not occur, so that the pulse noise is generated in most of the time zones. Because you can prevent it.

In the voltage detection circuit 30, the voltage of the battery cell 1 is input as an analog signal from the voltage detection line 31. In order to convert the input analog signal into a digital signal, the voltage detection circuit 30 is provided with an A / D converter 32 on the input side for converting the analog signal into a digital signal. The voltage detection circuit 30 can suppress the influence of pulse noise induced from the heater wire 5 by shifting the timing of converting an analog signal into a digital signal by the A / D converter 32 with the switching timing of the switching element 42. .. Therefore, the A / D converter 32 of the voltage detection circuit 30 sets the timing of converting the analog signal into the digital signal at a time different from that of the trigger signal, triggered by the timing at which the temperature control circuit 40 switches the switching element 42 on and off. Then, the input battery voltage is converted into a digital signal.

The temperature control circuit 40 can change the supply power of the seat heater 3 by changing the duty which is a ratio between the on time and the off time of the switching element 42. The temperature control circuit 40 increases the ratio of the on-time of the switching element 42, that is, increases the duty to increase the supply power of the seat heater 3, and conversely decreases the duty to decrease the supply power of the seat heater 3. .. The temperature control circuit 40 increases the power supply of the seat heater 3 when the battery cell 1 is at the minimum temperature, quickly heats the battery cell 1, and supplies power as the temperature of the battery cell 1 approaches the set temperature. The battery cell 1 is heated without difficulty by reducing the size. The temperature sensor 41 is a thermistor arranged in a heat-coupled state close to the surface of the battery cell 1. The temperature sensor 41 detects the battery temperature by changing the electric resistance with the temperature of the battery cell 1. The battery temperature detected by the temperature sensor 41 is input to the temperature control circuit 40. When the battery temperature detected by the temperature sensor 41 drops below the minimum temperature, the temperature control circuit 40 energizes the seat heater 3 to heat the battery cell 1, and the temperature of the heated battery cell 1 becomes the set temperature. At that time, the energization of the seat heater 3 is stopped, and when the temperature of the battery cell 1 becomes higher than the maximum temperature, the charge / discharge switch 51 is switched off to stop charging / discharging.

The voltage detection circuit 30 is connected to the positive and negative electrodes of each battery cell 1 via the voltage detection line 31 wired to the base sheet 4 of the seat heater 3. The power supply device 100 of FIG. 1 connects the voltage detection line 31 to the lead plate 2 and detects the voltage of the battery cell 1. The voltage detection circuit 30 detects the voltage of each battery cell 1 and outputs the detected voltage of each battery cell 1 to the control unit 50. The control unit 50 controls the charge / discharge switch 51 to control the charge / discharge of the battery cell 1. The charge / discharge switch 51 is the output side of the battery cells 1 directly connected to each other, and is connected in series with the output terminal 52. The charge / discharge switch 51 is, for example, a semiconductor switching element such as a FET or a transistor. The charge / discharge switch 51 is controlled on and off by the control unit 50.

The control unit 50 controls the charging / discharging current so as to prevent overcharging and overdischarging of each battery cell 1. For example, when the voltage of any battery cell 1 rises to the maximum voltage in the charged state, the charging current is cut off or limited to prevent overcharging, and in the discharged state, the voltage of any battery cell 1 is the lowest. When the voltage drops, the discharge current is cut off or limited to prevent over-discharge. The control unit 50 switches the charge / discharge switch 51 from on to off to cut off the charge / discharge current.

The voltage detection circuit 30 may be provided with an equalization circuit to eliminate the imbalance in the voltage of each battery cell 1. The equalization circuit detects the voltage of the battery cell 1 and equalizes the detected voltage to eliminate the voltage imbalance. The equalization circuit detects the voltage of each battery cell 1 and discharges the battery cell 1 having a high voltage to eliminate the imbalance.

In the power supply device shown in FIGS. 1 to 4, the battery block 10 is housed in the battery case 20, and the seat heater 3 for heating the battery cells 1 constituting the battery block 10 is arranged inside the battery case 20. .. The battery block 10 is divided into a plurality of core modules 9, and each core module 9 includes a plurality of battery cells 1. Further, in this core module 9, the negative electrode surface 9B in which the plurality of battery cells 1 are arranged in parallel to each other and the negative electrodes 1B of the plurality of battery cells 1 are arranged in the same plane, and the positive electrodes of the plurality of battery cells 1 are arranged. The positive electrode surface 9A on which 1A is arranged on the same plane is arranged on the facing surface. Furthermore, in the core module 9, the lead plate 2 is arranged on the negative electrode surface 9B and the positive electrode surface 9A, and the negative electrode lead plate 2B of the negative electrode surface 9B is connected to the negative electrode 1B of the plurality of battery cells 1 to connect the negative electrode surface 9A. The positive electrode lead plate 2A of the above is connected to the positive electrode 1A of a plurality of battery cells 1 and the battery cells 1 are connected in parallel.

In the battery block 10 shown in the plan view of FIG. 4, a plurality of core modules 9 are arranged in an arrangement in which the negative electrode surface 9B and the positive electrode surface 9A are alternately located on the same plane. In the battery block 10, the positive electrode surface 9A is arranged between the adjacent negative electrode surfaces 9B, and the negative electrode surface 9B is arranged between the adjacent positive electrode surfaces 9A. In the core module 9 of FIG. 4, a plurality of battery cells 1 (indicated by chain lines) are arranged in multiple stages and rows, and the negative electrode surface 9B and the positive electrode surface 9A have an elongated shape. In the battery block 10, a plurality of core modules 9 are arranged so that the elongated negative electrode surface 9B and the positive electrode surface 9A are parallel to each other. As shown in FIG. 3, in the core module 9, a negative electrode lead plate 2B made of one metal plate is arranged on the negative electrode surface 9B, and a positive electrode lead plate 2A made of one metal plate is arranged on the positive electrode surface 9A. The negative electrode 1B of the battery cell 1 is welded to the negative electrode lead plate 2B and the positive electrode 1A is welded to the positive electrode lead plate 2A, and all the battery cells 1 are connected in parallel by the negative electrode lead plate 2B and the positive electrode lead plate 2A.

The battery block 10 including a large number of core modules 9 has the core modules 9 arranged in multiple stages and rows. The battery block 10 shown in the plan view of FIG. 4 has eight core modules 9 arranged in two columns and four rows. In the four core modules 9 arranged in each row, the positive electrode lead plate 2A and the negative electrode lead plate 2B are connected in series and connected to each other in series. Since the negative electrode lead plate 2B and the positive electrode lead plate 2A are alternately arranged in the core module 9 in each row, the adjacent lead plates 2 can be connected and the core module 9 can be connected in series. The two rows of core modules 9 are connected in series or in parallel with each other.

In the figure, the core modules 9 arranged in the upper and lower rows are such that the upper row core module 9 and the lower row core module 9 are arranged in a staggered manner with the negative electrode surface 9B and the positive electrode surface 9A arranged in a staggered manner. The negative electrode surface 9B of the lower row core module 9 is arranged between the negative electrode surfaces 9B, and the positive electrode surface 9A of the lower row core module 9 is arranged between the positive electrode surfaces 9A of the upper row core module 9.

In the sheet heater 3, both the heater wire 5 and the voltage detection wire 31 are sewn on the non-woven fabric base sheet 4, and the insulating sheet 6 for protecting the heater wire 5 is laminated on the base sheet 4. The base sheet 4 and the insulating sheet 6 are, for example, flexible and cushioning non-woven fabrics in which plastic fibers are three-dimensionally assembled without directionality. The heater wire 5 is a flexible resistance wire whose surface is insulated with an insulating film, and the voltage detection wire 31 is a copper wire whose surface is coated with an insulating film. The heater wire 5 is sewn on the surface of the base sheet 4 in a heater pattern capable of uniformly heating all the battery cells 1, and the voltage detection wire 31 can connect a specific lead plate 2 to the voltage detection circuit 30. It is sewn on the pattern.

The heater wire 5 and the voltage detection wire 31 are provided with lead-out portions that are not sewn to the base sheet 4 at both ends to form connection portions 5x, 31x, 31y. FIG. 5 is an enlarged cross-sectional view showing a portion where the connection portion 31x of the voltage detection line 31 drawn from the base material sheet 4 is connected to the lead plate 2. The voltage detection line 31 draws out a portion not sewn to the base material sheet 4 from the slit 6a provided in the insulating sheet 6 to expose the connecting portion 31x from the insulating sheet 6. The connecting portion 31x is connected by removing the insulating film 31b and soldering or welding the conductive portion 31a to the surface of the lead plate 2. The connecting portion 31x connected to the lead plate 2 is pulled out from the base sheet 4 and the insulating sheet 6 in the vicinity of the connecting portion with the lead plate 2 and connected to the lead plate 2. The voltage detection line 31 having one end connected to the lead plate 2 is provided with a connection portion 31y by pulling out the other end portion from the outer peripheral edge of the base sheet 4 and the insulating sheet 6, and the connection portion 31y is connected to the voltage detection circuit 30. It is connected to the voltage detection circuit 30 by soldering to the input terminal or connecting a connector. The heater wire 5 is also connected to the temperature control circuit 40 by pulling out both ends from the outer peripheral edges of the base sheet 4 and the insulating sheet 6 to provide a connecting portion 5x, soldering the connecting portion 5x, or connecting to a connector. Ru.

The seat heater 3 is elastically pressed against the surface of the lead plate 2 by the cushion sheet 7 to efficiently and uniformly heat the lead plate 2. As the cushion sheet 7, an elastic sheet made of a soft plastic foam such as a soft urethane foam as an insulating material is suitable. However, a rubber-like elastic sheet that elastically deforms when pressed can also be used. The cushion sheet 7 is a sheet thicker than the distance between the battery case 20 and the seat heater 3 when not pressed, and the seat heater 3 is connected to the lead plate 2 in a state of being sandwiched between the battery case 20 and the seat heater 3 and crushed. Elastically press. The cushion sheet 7 has an outer shape substantially equal to the outer shape of the seat heater 3, is laminated on the surface, and elastically presses the seat heater 3 against the lead plate 2.

In the battery case 20 shown in the schematic cross-sectional view of FIG. 3, the upper opening of the lower case 21 is closed by the upper case 22, and the battery block 10 is housed in the lower case 21. The lower case 21 and the upper case 22 are made of metal and are connected by a structure such as screwing to form a closed structure inside. In the core module 9 of the battery block 10, the battery cell 1 is arranged in a holding portion provided in the plastic battery holder 8, and a plurality of battery cells 1 are arranged in a fixed position. Since the battery holder 8 is manufactured by molding the plastic of the insulating material, the periphery of the core module 9 is in a state of being insulated by the battery holder 8. The periphery of the core module 9 is insulated by the battery holder 8, but the conductive portion is exposed on the surface on which the negative electrode lead plate 2B and the positive electrode lead plate 2A are arranged.

In the battery case 20 shown in the schematic cross-sectional view of FIG. 3, an insulating plate 15 such as a plastic plate as an insulating material is arranged on the bottom surface 23 of the lower case 21 and the inner surface of the upper case 22. In the power supply device 100 having this structure, the bottom surface 23 of the lower case 21 and the inner surface of the upper case 22 are insulated by the insulating plate 15, and the negative electrode lead plate 2B and the positive electrode lead plate 2A come into contact with the metal battery case 20. Can be prevented. As shown in the figure, the insulating plate 15 that closes the upper opening of the lower case 21 is provided with an elastic bent portion 15A that is bent in a V shape on the outer peripheral edge, and the elastic bent portion 15A is combined with the battery block 10 and the lower case. By inserting it into the gap between the peripheral wall 24 of 21 and the peripheral wall 24, the upper opening of the lower case 21 can be closed without a gap. The power supply device 100 that closes the upper opening of the lower case 21 prevents the air heated by the seat heater 3 from leaking to the outside and circulates, thereby increasing the heating efficiency of the battery cell 1 by the seat heater 3. It is possible to heat all the battery cells 1 evenly through the heated internal air.

The above power supply device is assembled by the following steps.
1. 1. Manufacturing process of battery block 10 After setting the battery cell 1 in a fixed position of the plastic battery holder 8, the negative electrode lead plate 2B is welded to the negative electrode 1B of each battery cell 1 and the positive electrode lead plate 2A is welded to the positive electrode 1A. The battery block 10 is manufactured.
Since the battery block 10 is divided into a plurality of core modules 9, each core module 9 has a negative electrode lead plate 2B welded to the negative electrode 1B side of the battery cell 1 and a positive electrode lead plate 2B to the positive electrode 1A side. 2A is welded. In the adjacent core module 9, the negative electrode lead plate 2B and the positive electrode lead plate 2A are alternately arranged, but the negative electrode lead plate 2B and the positive electrode lead plate 2A are connected by the lead plate 2 and connected in series. However, it is also possible to connect the lead plates 2 on the opposite sides of the adjacent core modules 9 and connect the adjacent core modules 9 in parallel.

2. 2. Step of stacking the seat heater 3 on the battery block 10 The seat heater 3 is arranged on the surface of the battery block 10. The seat heater 3 is joined to the lead plate 2 with double-sided tape (not shown) and placed in a fixed position. In the seat heater 3, the connection portion 5x of the heater wire 5 drawn out from the base sheet 4 is connected to the temperature control circuit 40, the connection portion 31x of the voltage detection line 31 is connected to the lead plate 2, and the connection portion 31y is a voltage detection circuit. Connect to 30 respectively.

3. 3. Step of joining the cushion sheet 7 to the seat heater 3 The cushion sheet 7 is joined to the surface of the seat heater 3 via a double-sided adhesive tape (not shown). The cushion sheet 7 is also joined to the surface of the seat heater 3 so as not to be displaced.

4. Step of inserting the battery block 10 into the battery case 20 With the insulating plate 15 placed on the bottom surface 23 of the lower case 21, the battery block 10 to which the seat heater 3 and the cushion sheet 7 are joined is inserted into the lower case 21. Place in place. After that, the insulating plate 15 is arranged on the battery block 10, and the elastic bent portion 15A provided on the outer periphery of the insulating plate 15 is inserted between the peripheral wall 24 of the lower case 21 and the battery block 10.
After that, the upper case 22 is fixed to the lower case 21, and the upper opening of the lower case 21 is closed by the upper case 22. The upper case 22 is fixed to the lower case 21 by screwing, for example.

The present invention is a power supply device including a voltage detection circuit that detects the voltage of the battery cell, and in particular, is provided with a seat heater that heats the battery cell in a low temperature environment, and is installed outdoors, for example, in a base station or the like. It is suitably used as a power supply device for electric devices used in applications where the usage environment is low, such as electric devices.

100 ... Power supply device 1 ... Battery cell 1A ... Positive electrode 1B ... Negative electrode 2 ... Lead plate 2A ... Positive electrode lead plate 2B ... Negative electrode lead plate 3 ... Sheet heater 4 ... Base sheet 5 ... Heater wire 5x ... Connection part 6 ... Insulation sheet 6a Slit 7 ... Cushion sheet 8 ... Battery holder 9 ... Core module 9A ... Positive electrode surface 9B ... Negative electrode surface 10 ... Battery block 15 ... Insulation plate 15A ... Elastic bending part 20 ... Battery case 21 ... Lower case 22 ... Upper case 23 ... Bottom surface 24 ... Peripheral wall 30 ... Voltage detection circuit 31 ... Voltage detection line 31a ... Conductive part 31b ... Insulation film 31x, 31y ... Connection part 32 ... A / D converter 40 ... Temperature control circuit 41 ... Temperature sensor 42 ... Switching element 50 ... Control unit 51 ... Charge / discharge switch 52 ... Output terminal

Claims (8)

A battery block consisting of a plurality of battery cells provided with positive and negative electrodes at both ends,
A voltage detection circuit that detects the voltage of the battery cell and
A voltage detection line formed by electrically connecting the voltage detection circuit and the electrode of the battery cell,
A seat heater that heats the battery cell and
It is a power supply device equipped with
A power supply device characterized in that the voltage detection line is connected to the seat heater. The power supply device according to claim 1.
The seat heater
With a flexible and insulating base sheet,
A heater wire connected to the base sheet and
A power supply device including a voltage detection line connected to the base material sheet. The power supply device according to claim 2.
A power supply device characterized in that the base material sheet is a non-woven fabric. The power supply device according to claim 2 or 3.
A power supply device characterized in that the voltage detection line is sewn onto the base material sheet. The power supply device according to any one of claims 2 to 4.
The seat heater
An insulating sheet laminated on the base material sheet is provided.
A power supply device characterized in that the voltage detection line and the heater line are arranged between the base material sheet and the insulating sheet. The power supply device according to any one of claims 1 to 5.
The voltage detection line
It is connected to a lead plate connected to the electrode terminal of the battery cell, and is connected to the lead plate.
A power supply device characterized by being electrically connected to an electrode of the battery cell via the lead plate. The power supply device according to any one of claims 1 to 6, and further.
A temperature control circuit connected to the seat heater and controlling the power supply of the seat heater is provided.
The temperature control circuit
A power supply device characterized in that the energizing current of the seat heater is switched on and off at a cycle lower than 10 Hz to control the supplied power. The power supply device according to claim 7.
The voltage detection circuit
An A / D converter that detects the voltage of the battery cell and converts it into a digital signal is provided.
The A / D converter
A power supply device characterized in that the temperature control circuit converts a battery voltage into a digital signal at a timing different from the switching timing for switching the current of the seat heater on and off.

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