JP2023039190A - All-solid battery control device - Google Patents

Abstract

To provide an all-solid battery control device for controlling an all-solid battery, the all-solid battery control device being capable of adjusting binding pressure on the all-solid battery depending on an internal resistance value of the all-solid battery.SOLUTION: An all-solid battery control device 1 for controlling binding pressure of an all-solid battery 10 having a solid electrolyte layer 11c comprises: a voltage detector 2 connected to the all-solid battery 10; a current detector 3 connected to the all-solid battery 10; a cell series resistance calculation unit 5a for calculating a cell series resistance value of the all-solid battery 10 on the basis of a detection value of the voltage detector 2 and a detection value of the current detector 3; and a pressure adjustment unit 5b for adjusting binding pressure on the basis of the cell series resistance value.SELECTED DRAWING: Figure 1

Description

The present invention relates to an all-solid-state battery control device.

In recent years, all-solid-state batteries using a solid as an electrolyte have been developed. For example, Patent Literature 1 discloses an all-solid-state battery. The all-solid-state battery disclosed in Patent Document 1 includes a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed therebetween. In all-solid-state batteries, it is known that the battery voltage changes according to the pressure acting in the stacking direction of the positive electrode layer, the negative electrode layer, and the solid electrolyte layer. Therefore, in Patent Document 1, a pressure control means is provided for adjusting the pressure that constrains the positive electrode layer, the negative electrode layer, and the solid electrolyte layer in the stacking direction. In Patent Document 1, the battery voltage is detected, and the pressure acting in the stacking direction of the positive electrode layer, the negative electrode layer, and the solid electrolyte layer is adjusted according to the battery voltage.

JP 2010-205479 A

By the way, in an all-solid-state battery, the internal resistance value may change due to battery temperature and deterioration of the solid electrolyte, and may deviate from the internal resistance value suitable for the all-solid-state battery. In Patent Document 1, changes in the internal resistance value of the all-solid-state battery are not taken into consideration, and the pressure that restrains the all-solid-state battery is not adjusted according to the internal resistance value.

The present invention has been made in view of the above-described problems, and provides an all-solid-state battery control device for controlling an all-solid-state battery, in which the restraining pressure on the all-solid-state battery can be adjusted according to the internal resistance value of the all-solid-state battery. intended to

The present invention employs the following configurations as means for solving the above problems.

A first aspect of the present invention is an all-solid-state battery control device for controlling a confining pressure of an all-solid-state battery having a solid electrolyte layer, comprising: a voltage detector connected to the all-solid-state battery; a connected current detector; an internal resistance calculator for calculating an internal resistance value of the all-solid-state battery based on the detected value of the voltage detector and the detected value of the current detector; A configuration is adopted in which a pressure adjustment unit that adjusts the restraining pressure is provided.

In a second aspect of the present invention, in the first aspect, the pressure adjustment unit compares a pressure upper limit value, which is an upper limit value of the confining pressure, with the confining pressure obtained based on the internal resistance value. Then, when the confining pressure obtained based on the internal resistance value exceeds the pressure upper limit value, the confining pressure of the all-solid-state battery is limited to the pressure upper limit value.

A third aspect of the present invention is the second aspect, further comprising a temperature detector that detects the temperature of the all-solid-state battery, and the pressure adjustment unit adjusts the pressure upper limit according to the detected value of the temperature detector. Adopt a configuration that changes the value.

According to a fourth aspect of the present invention, in any one of the first to third aspects, an abnormality determination unit that determines whether or not there is an abnormality in the all-solid-state battery is provided, and the abnormality determination unit is based on the internal resistance value. The internal resistance value after the restraint pressure adjustment estimated from the restraint pressure obtained by the method is obtained as an estimated internal resistance value, and after the restraint pressure adjustment, the total resistance value is calculated based on the detection value of the voltage detector and the detection value of the current detector. A configuration is adopted in which the internal resistance value of the solid-state battery is obtained as the adjusted internal resistance value, and whether or not the all-solid-state battery is abnormal is determined based on the difference between the estimated internal resistance value and the adjusted internal resistance value.

A fifth aspect of the present invention is the fourth aspect, further comprising a temperature detector that detects the temperature of the all-solid-state battery, and the abnormality determination unit detects the abnormality according to the detection value of the temperature detector. An anomaly detection processing threshold value for performing presence/absence detection processing is set, and when the difference between the estimated internal resistance value and the adjusted internal resistance value is greater than or equal to the anomaly detection processing threshold value, the presence or absence of the anomaly is determined. A configuration is adopted in which detection processing is performed.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, a temperature detector for detecting the temperature of the all-solid-state battery is provided, and the pressure adjustment unit is configured such that the detected value of the temperature detector is When the temperature of the all-solid-state battery is equal to or lower than the required temperature rise, the confining pressure for the all-solid-state battery is made lower than the confining pressure based on the internal resistance value.

The present invention includes a voltage detector connected to the all-solid battery and a current detector connected to the all-solid battery. Further, in the present invention, the internal resistance value of the all-solid-state battery is calculated based on the detected value of the voltage detector and the detected value of the current detector, and the confining pressure is adjusted based on the internal resistance value. Therefore, according to the present invention, in the all-solid-state battery control device for controlling the all-solid-state battery, it is possible to adjust the restraining pressure on the all-solid-state battery according to the internal resistance value of the all-solid-state battery.

1 is a block diagram showing a schematic configuration of an all-solid-state battery control device according to a first embodiment of the present invention; FIG. 4 is a flowchart for explaining the operation of the all-solid-state battery control device according to the first embodiment of the present invention; FIG. 4 is a block diagram showing a schematic configuration of an all-solid-state battery control device according to a second embodiment of the present invention; 9 is a flowchart for explaining the operation of the all-solid-state battery control device according to the second embodiment of the present invention; It is a flow chart for explaining operation of the all-solid-state battery control device in a 3rd embodiment of the present invention. It is a flow chart for explaining operation of the all-solid-state battery control device in a 4th embodiment of the present invention.

An embodiment of an all-solid-state battery control device according to the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing a schematic configuration of an all-solid-state battery control device 1 of this embodiment. The all-solid-state battery control device 1 of the present embodiment monitors the all-solid-state battery 10 and adjusts the restraining pressure acting on the all-solid-state battery 10 .

First, the all-solid-state battery 10 whose constraint pressure is adjusted by the all-solid-state battery control device 1 of the present embodiment will be described. The all-solid-state battery 10 is a secondary battery that includes a solid electrolyte (a material for forming a negative electrode mixture layer 11a, a material for forming a positive electrode mixture layer 11b, and a material for forming a solid electrolyte layer 11c, which will be described later). As shown in FIG. 1, the all-solid battery 10 includes a plurality of cells 11, a negative electrode current collector 12, a positive electrode current collector 13, a pressure mechanism 14, and a battery case 15. It has

Each cell 11 has a negative electrode mixture layer 11a, a positive electrode mixture layer 11b, and a solid electrolyte layer 11c. The negative electrode mixture layer 11a, the positive electrode mixture layer 11b, and the solid electrolyte layer 11c are laminated.

Although the installation posture of the all-solid-state battery 10 is not particularly limited, in the following description, for convenience of explanation, the stacking direction of the negative electrode mixture layer 11a, the positive electrode mixture layer 11b, and the solid electrolyte layer 11c is set vertically. and In the all-solid-state battery 10 shown in FIG. 1, the negative electrode mixture layer 11a, the positive electrode mixture layer 11b, and the solid electrolyte layer 11c are arranged in this order from the bottom: the negative electrode mixture layer 11a, the solid electrolyte layer 11c, and the positive electrode mixture layer 11b. Laminated.

The negative electrode mixture layer 11a is a layer formed by mixing, for example, a granular negative electrode active material and, for example, a powdery solid electrolyte. For example, the negative electrode mixture layer 11a is formed by pressure-molding a mixture of a negative electrode active material and a solid electrolyte.

Although the negative electrode active material is not particularly limited, it is possible to use, for example, graphite or carbon. The solid electrolyte contained in the negative electrode mixture layer 11a is not particularly limited, but a sulfide-based electrolyte or an oxide-based electrolyte can be used. The negative electrode mixture layer 11a may contain a conductive auxiliary material and a binder.

The positive electrode mixture layer 11b is arranged to face the negative electrode mixture layer 11a with the solid electrolyte layer 11c interposed therebetween. The positive electrode mixture layer 11b is a layer formed by mixing, for example, a granular positive electrode active material and, for example, a powdery solid electrolyte. For example, the positive electrode mixture layer 11b is formed by pressure-molding a mixture of a positive electrode active material and a solid electrolyte.

Although the positive electrode active material is not particularly limited, for example, LiCoO ₂ , LiNiO ₂ , LiMn ₂ O ₄ and LiCo _0.5 can be used. The solid electrolyte contained in the positive electrode mixture layer 11b is not particularly limited, but a sulfide-based electrolyte or an oxide-based electrolyte can be used. In addition, the positive electrode mixture layer 11b may contain a conductive auxiliary material and a binder.

The solid electrolyte layer 11c is interposed between the negative electrode mixture layer 11a and the positive electrode mixture layer 11b. This solid electrolyte layer 11c is formed of, for example, a granular solid electrolyte. For example, the solid electrolyte layer 11c is formed by pressure-molding a granular solid electrolyte. The solid electrolyte is not particularly limited, but a sulfide-based electrolyte or an oxide-based electrolyte can be used.

As shown in FIG. 1, the all-solid-state battery 10 includes a plurality of cells 11 vertically stacked. These cells 11 are electrically connected in series. A negative electrode current collector 12 is connected to the negative electrode mixture layer 11 a of the cell 11 arranged at the lowest position among the plurality of cells 11 . In addition, the positive electrode current collector 13 is connected to the positive electrode mixture layer 11b of the cell 11 arranged at the uppermost position among the plurality of cells 11 .

The negative electrode current collector 12 has one end connected to the negative electrode mixture layer 11 a of the cell 11 inside the battery case 15 and the other end pulled out to the outside of the battery case 15 . The portion of the negative electrode current collector 12 that is pulled out of the battery case 15 serves as the negative electrode terminal of the all-solid-state battery 10 . A material for forming the negative electrode current collector 12 is not particularly limited, but copper, for example, can be used.

The positive electrode current collector 13 has one end connected to the positive electrode mixture layer 11 b of the cell 11 inside the battery case 15 and the other end pulled out to the outside of the battery case 15 . The portion of the positive electrode current collector 13 that is pulled out of the battery case 15 serves as the positive electrode terminal of the all-solid-state battery 10 . Although the material for forming the positive electrode current collector 13 is not particularly limited, for example, aluminum can be used.

The pressurizing mechanism 14 is arranged above the plurality of stacked cells 11 and generates pressure to be applied to these cells 11 . The pressure applied from the pressurizing mechanism 14 to the plurality of cells 11 is referred to as confining pressure.

As shown in FIG. 1, the pressurizing mechanism 14 includes a pressurizing plate 14a and a pressurizing piston 14b. The pressure plate 14a is a plate member that abuts from above on the upper surface of the uppermost cell among the plurality of cells 11 . This pressure plate 14a is formed, for example, in a size that covers the entire cell 11 when viewed from above.

The pressurizing piston 14b is connected to the pressurizing plate 14a from above and fixed to the battery case 15 . The pressurizing piston 14b generates a pressing force that presses the pressurizing plate 14a from above.

This pressing force generates a confining pressure that accelerates the cell 11 . The pressurizing piston 14b is connected to the control unit 5, which will be described later, and adjusts the pressing force under the control of the control unit 5. As shown in FIG. That is, under the control of the control unit 5, the pressing force of the pressurizing piston 14b is adjusted, thereby adjusting the restraining pressure acting on the cell 11. As shown in FIG.

The battery case 15 is a container that accommodates the plurality of cells 11 . The battery case 15 also accommodates the pressure mechanism 14 . Further, the battery case 15 is penetrated with the negative electrode current collector 12 and the positive electrode current collector 13 in a sealed state.

Such an all-solid-state battery 10 is connected to a load such as a motor via, for example, a power conversion device (not shown). The all-solid-state battery 10 supplies electric power charged in the cell 11 to a load via a power conversion device. Further, the all-solid-state battery 10 stores regenerated power supplied from a load via the power conversion device and power supplied from an external power source via the power conversion device.

As shown in FIG. 1 , the all-solid-state battery control device 1 of this embodiment includes a voltage detector 2 , a current detector 3 , an AC generator 4 and a controller 5 . The voltage detector 2 is connected to the negative terminal (negative collector 12) and the positive terminal (positive collector 13) of the all-solid-state battery 10 via wiring. This voltage detector 2 detects the potential difference between the negative terminal and the positive terminal and outputs the detected value.

In this embodiment, an AC signal for detecting the cell series resistance value is applied from the AC generator 4 to the all-solid-state battery 10 . The voltage detector 2 detects the potential difference between the negative terminal and the positive terminal when an AC signal is applied to the all-solid-state battery 10 . The voltage detector 2 can also detect the battery voltage of the all-solid-state battery 10 when no AC signal is applied.

The current detector 3 is connected to the negative terminal of the all-solid-state battery 10 via wiring. This current detector 3 detects the value of current flowing through the negative terminal of the all-solid-state battery 10 and outputs the detected value. That is, the current detector 3 detects the current value of the negative terminal when an AC signal is applied to the all-solid-state battery 10 . Note that the current detector 3 may be connected to the positive terminal of the all-solid-state battery 10 via wiring. The current detector 3 can also detect the output current of the all-solid-state battery 10 when no AC signal is applied.

The AC generator 4 is connected to a negative terminal (negative collector 12) and a positive terminal (positive collector 13) of the all-solid-state battery 10 via wiring. The AC generator 4 is connected to the control unit 5 , and under the control of the control unit 5 , generates an AC signal to be applied to the all-solid battery 10 and supplies it to the all-solid battery 10 .

In addition, when the all-solid-state battery 10 is connected to a power converter, it is also possible to supply an AC signal from the power converter to the all-solid-state battery 10, for example. In such a case, it is possible to omit the AC generator 4 from the all-solid-state battery control device 1 of the present embodiment.

Further, in the present embodiment, the so-called AC method is used to obtain the cell series resistance value. However, it is also possible to determine the cell series resistance using the so-called DC method. In this way, when obtaining the cell series resistance value using the DC method, it is possible to omit the AC generator 4 from the all-solid-state battery control device 1 of the present embodiment.

The control unit 5 monitors the state of the all-solid-state battery 10 and adjusts the restraining pressure of the all-solid-state battery 10 . This controller 5 is connected to the voltage detector 2 , the current detector 3 and the AC generator 4 .

Also, the control unit 5 is formed by a computer device or the like including a storage device, an arithmetic device, and the like. The storage device includes memory such as ROM (Read Only Memory) and RAM (Random Access Memory), and storage such as HDD (Hard Disk Drive) and SSD (Solid State Drive). The calculation device performs calculations based on programs, operation signals, and the like. This arithmetic unit is composed of an interface circuit, a CPU (Central Processing Unit), and the like.

In the present embodiment, the control unit 5 has a functional unit that is embodied by cooperation between hardware such as the above-described storage device and arithmetic device, and programs and data stored in the storage device. . As shown in FIG. 1, in the present embodiment, the control unit 5 includes, as functional units, a cell series resistance calculation unit 5a (internal resistance calculation unit), a pressure adjustment unit 5b, an abnormality determination unit 5c, and a storage unit 5d. It has

The cell series resistance calculation unit 5a calculates the cell series resistance of the all-solid-state battery based on the detection value of the voltage detector 2 (hereinafter referred to as the detected voltage value) and the detection value of the current detector 3 (hereinafter referred to as the detected current value). Calculate the resistance value (internal resistance value).

The cell series resistance calculator 5a inputs an AC signal output command for calculating the cell series resistance value to the AC generator 4 at the timing of calculating the cell series resistance. Further, the cell series resistance calculation unit 5a calculates the cell series resistance value based on the detected voltage value and the detected current value obtained while the AC signal is supplied to the all-solid-state battery 10 .

For example, more specifically, the cell series resistance calculator 5a calculates the cell series resistance value by dividing the change in the detected voltage value over a predetermined time period by the change value in the detected current value over a predetermined time period.

The pressure adjustment unit 5b adjusts the confining pressure based on the cell series resistance value calculated by the cell series resistance calculation unit 5a. For example, the pressure adjustment unit 5b sets a target cell series resistance value (hereinafter referred to as a target cell series resistance value) based on a relational table or the like showing changes in the cell series resistance value with respect to changes in the restraining pressure. Calculate the confining pressure. The pressure adjustment unit 5b adjusts the confining pressure by controlling the pressure mechanism 14 so that the confining pressure of the all-solid-state battery 10 becomes the calculated confining pressure.

In this embodiment, the pressure adjustment unit 5b compares the confining pressure obtained based on the target cell series resistance value with the pressure upper limit, which is the upper limit of the confining pressure. Here, when the confining pressure obtained based on the target cell series resistance value exceeds the pressure upper limit, the pressure adjusting unit 5b limits the confining pressure of the all-solid-state battery 10 to the pressure upper limit.

The abnormality determination unit 5c obtains the cell series resistance value after adjustment of the constraint pressure, which is estimated from the constraint pressure obtained based on the target cell series resistance value, as an estimated cell series resistance value (estimated internal resistance value). If the confining pressure obtained based on the target cell series resistance value is the confining pressure obtained so that the actual cell series resistance value becomes the target cell series resistance value, then based on the target cell series resistance value The estimated cell series resistance value becomes the target cell series resistance value on the condition that the obtained confining pressure does not exceed the pressure upper limit value.

Further, the abnormality determination unit 5c obtains the cell series resistance value of the all-solid-state battery 10 as an adjusted cell series resistance value (adjusted internal resistance value) based on the detected voltage value and the detected current value after adjusting the restraint pressure. Furthermore, the abnormality determination unit 5c determines whether or not the all-solid-state battery 10 is abnormal based on the difference between the estimated cell series resistance value and the adjusted cell series resistance value.

For example, when the cells 11 and the like are normal and the all-solid-state battery 10 is not abnormal, the adjusted cell series resistance value is close to the estimated cell series resistance value even if there is an error. On the other hand, if the difference between the estimated cell series resistance value and the adjusted cell series resistance value is large, it is conceivable that one or more of the cells 11 are abnormal. Therefore, when the difference between the estimated cell series resistance value and the adjusted cell series resistance value is large, it is determined that the all-solid-state battery 10 is abnormal, or the abnormality detection for detecting the abnormality of the all-solid-state battery 10 is performed. It is desirable to perform processing.

In the present embodiment, the abnormality determination unit 5c includes an abnormality detection process threshold for determining the necessity of executing abnormality detection processing for detecting an abnormality in the all-solid-state battery 10, an estimated cell series resistance value, and an adjusted cell series resistance value. Compare the difference with the resistance value. The abnormality determination unit 5c executes abnormality detection processing when the difference between the estimated cell series resistance value and the adjusted cell series resistance value is equal to or greater than the threshold value for abnormality detection processing.

The storage unit 5d stores programs and various data. For example, the storage unit 5d stores a relationship table showing changes in cell series resistance with respect to changes in confining pressure, target cell series resistance, upper limit of pressure, threshold for necessary abnormality detection processing, and the like.

Next, the operation of the all-solid-state battery control device 1 of this embodiment will be described with reference to the flowchart of FIG. In addition, in the following description, the main body of operation is the control part 5. FIG.

As shown in FIG. 2, first, the cell series resistance value is calculated (step S1). Here, the cell series resistance value is calculated by the cell series resistance calculator 5 a of the controller 5 . The cell series resistance calculator 5a causes the AC generator 4 to output an AC signal.

Such an AC signal is input to the all-solid-state battery 10 . The cell series resistance calculator 5a calculates the cell series resistance value of the all-solid-state battery 10 based on the detected voltage value and the detected current value while the AC signal is being supplied to the all-solid-state battery 10 .

In the present embodiment, the cell series resistance calculator 5a calculates the cell series resistance value by dividing the change in the detected voltage value over a predetermined time period by the change value in the detected current value over a predetermined time period.

Subsequently, as shown in FIG. 2, the constraint pressure is calculated (step S2). Here, the pressure adjustment section 5b of the control section 5 calculates the restraining pressure. The pressure adjustment unit 5b adjusts the storage unit 5d based on the relationship table stored in the storage unit 5d (a table showing the change in the cell series resistance value with respect to the change in the restraint pressure) and the cell series resistance value calculated in step S1. Calculates the confining pressure for achieving the target cell series resistance value stored in .

Subsequently, as shown in FIG. 2, it is determined whether or not the confining pressure calculated in step S2 exceeds the pressure upper limit (step S3). Here, it is determined whether or not the calculated constraint pressure exceeds the pressure upper limit value by the pressure adjustment unit 5b.

The pressure adjustment unit 5b compares the confining pressure obtained based on the cell series resistance value (the confining pressure calculated in step S2) with the pressure upper limit, which is the upper limit of the confining pressure. Then, when the calculated confining pressure is greater than the pressure upper limit, the pressure adjustment unit 5b determines that the calculated confining pressure exceeds the pressure upper limit. On the other hand, when the calculated confining pressure is equal to or less than the pressure upper limit, the pressure adjusting unit 5b determines that the calculated confining pressure does not exceed the pressure upper limit.

When it is determined in step S3 that the calculated confining pressure exceeds the pressure upper limit, the pressure adjustment unit 5b limits the confining pressure to the pressure upper limit (step S4). On the other hand, when it is determined in step S3 that the calculated confining pressure does not exceed the upper pressure limit, the pressure adjustment unit 5b adjusts the confining pressure (step S5).

In addition, when step S4 is completed, it transfers to step S5. In step S5, the pressure adjusting unit 5b adjusts the confining pressure by controlling the pressurizing mechanism 14 so that the confining pressure of the all-solid-state battery 10 becomes the obtained confining pressure.

Subsequently, an estimated cell series resistance value is calculated (step S6). Here, the abnormality determination unit 5c of the control unit 5 calculates the estimated cell series resistance value. The abnormality determination unit 5c estimates the cell series resistance value after adjustment of the constraint pressure from, for example, the constraint pressure calculated in step S2 and a relational table showing the change in the cell series resistance value with respect to the change in the constraint pressure. The abnormality determination unit 5c uses the cell series resistance value after adjusting the constraint pressure obtained by this estimation as the estimated cell series resistance.

Note that step S6 may be performed before step S5. That is, when it is determined that the restraining pressure calculated in step S3 exceeds the pressure upper limit, step S6 may be performed between steps S4 and S5. Moreover, when it is determined that the restraining pressure calculated in step S3 does not exceed the pressure upper limit value, step S6 may be performed between step S3 and step S5.

Subsequently, the post-adjustment cell series resistance value is calculated (step S7). Here, for example, the adjusted cell series resistance value is calculated by the cell series resistance calculator 5 a of the controller 5 . The adjusted cell series resistance value is the cell series resistance obtained based on the detected voltage value and the detected current value after the restraining pressure is adjusted in step S5.

Again, the cell series resistance calculator 5a causes the AC generator 4 to output an AC signal as in step S1. The cell series resistance calculator 5a calculates an adjusted cell series resistance value by dividing the change in the detected voltage value over a predetermined time period by the change value in the detected current value over a predetermined time period.

Subsequently, it is determined whether or not the difference between the estimated cell series resistance value and the adjusted cell series resistance value is equal to or greater than the abnormality detection processing threshold (step S8). Here, for example, the abnormality determination unit 5c determines whether or not the difference between the estimated cell series resistance value and the adjusted cell series resistance value is equal to or greater than the threshold value for abnormality detection processing.

The abnormality determination unit 5c determines a necessary abnormality detection processing threshold for determining the necessity of executing abnormality detection processing for detecting an abnormality in the all-solid-state battery 10, a difference between the estimated cell series resistance value and the adjusted cell series resistance value, and compare. Thereby, the abnormality determination unit 5c executes step S8.

If the difference between the estimated cell series resistance value and the adjusted cell series resistance value is equal to or greater than the threshold for abnormality detection processing, an abnormality detection process for detecting an abnormality in the all-solid-state battery 10 is executed (step S9). . Here, for example, the abnormality determination unit 5c executes abnormality detection processing for detecting abnormality in the all-solid-state battery 10. FIG.

When the abnormality detection process is executed, the operator or the like is notified of the presence or absence of abnormality. For example, if no abnormality is found as a result of executing the abnormality detection process, the process may return to step S1. Further, even if no abnormality is found as a result of executing the normal detection process, it is possible to proceed to step S1 if there is no instruction from the operator.

If it is determined in step S8 that the difference between the estimated cell series resistance value and the adjusted cell series resistance value is not equal to or greater than the threshold value for abnormality detection processing, the process returns to step S1, for example. Here, a signal indicating that there is no abnormality is input from the abnormality determination section 5c to the cell series resistance calculation section 5a, and the cell series resistance calculation section 5a executes step S1 again.

The all-solid-state battery control device 1 of the present embodiment as described above controls the confining pressure of the all-solid-state battery 10 having the solid electrolyte layer 11c. Further, the all-solid-state battery control device 1 of the present embodiment includes a voltage detector 2 connected to the all-solid-state battery 10, a current detector 3 connected to the all-solid-state battery 10, a cell series resistance calculator 5a, and a pressure adjusting portion 5b. The cell series resistance calculator 5 a calculates the cell series resistance value of the all-solid-state battery 10 based on the detection value of the voltage detector 2 and the detection value of the current detector 3 . Moreover, the pressure adjustment unit 5b adjusts the restraining pressure based on the cell series resistance value.

The all-solid-state battery control device 1 of this embodiment includes the voltage detector 2 connected to the all-solid-state battery 10 and the current detector 3 connected to the all-solid-state battery 10 as described above. Further, in the all-solid-state battery control device 1 of the present embodiment, the cell series resistance value of the all-solid-state battery 10 is calculated based on the detection value of the voltage detector 2 and the detection value of the current detector 3, and the cell series resistance value The restraining pressure is adjusted based on Therefore, according to the all-solid-state battery control device 1 of the present embodiment, it is possible to adjust the restraining pressure to the all-solid-state battery 10 according to the cell series resistance value of the all-solid-state battery 10 .

In addition, in the all-solid-state battery control device 1 of the present embodiment, the pressure adjustment unit 5b compares the pressure upper limit, which is the upper limit of the confining pressure, with the confining pressure obtained based on the cell series resistance value. Further, when the confining pressure obtained based on the cell series resistance exceeds the pressure upper limit, the pressure adjusting unit 5b limits the confining pressure of the all-solid-state battery 10 to the pressure upper limit. According to such an all-solid-state battery control device 1 of the present embodiment, it is possible to prevent a confining pressure exceeding the upper pressure limit from acting on the cell 11 .

Further, the all-solid-state battery control device 1 of the present embodiment includes an abnormality determination section 5c that determines whether or not the all-solid-state battery 10 has an abnormality. The abnormality determination unit 5c obtains the cell series resistance value after adjustment of the constraint pressure, which is estimated from the constraint pressure obtained based on the cell series resistance value, as an estimated cell series resistance value. Further, the abnormality determination unit 5c obtains the cell series resistance value of the all-solid-state battery 10 as the adjusted cell series resistance value based on the detection value of the voltage detector 2 and the detection value of the current detector 3 after adjusting the restraining pressure. Furthermore, the abnormality determination unit 5c determines whether or not the all-solid-state battery 10 is abnormal based on the difference between the estimated cell series resistance value and the adjusted cell series resistance value.

If the difference between the estimated cell series resistance value and the adjusted cell series resistance value is large, it is conceivable that one or more of the cells 11 may be abnormal. According to the all-solid-state battery control device 1 of the present embodiment, when the difference between the estimated cell series resistance value and the adjusted cell series resistance value is large, an abnormality detection process for detecting an abnormality in the all-solid-state battery 10 is performed. Execute. Therefore, it is possible to quickly grasp the abnormality of the cell 11 .

(Second embodiment)
Next, a second embodiment of the invention will be described. In the description of the present embodiment, the description of the same parts as those of the first embodiment will be omitted or simplified.

FIG. 3 is a block diagram showing a schematic configuration of the all-solid-state battery control device 1A of this embodiment. As shown in FIG. 3, the all-solid-state battery control device 1A of this embodiment further includes a temperature detector 6 in addition to the all-solid-state battery control device 1 of the first embodiment.

The temperature detector 6 detects the temperature of the all-solid-state battery 10 and outputs the detected value (hereinafter referred to as the detected temperature value). This temperature detector 6 is installed so as to be close to or in contact with the all-solid-state battery 10 .

In the all-solid-state battery 10, when the temperature of the all-solid-state battery 10 is relatively high, the solid electrolyte layer 11c and the like expand. Moreover, in the all-solid-state battery 10, when the temperature of the all-solid-state battery 10 is relatively low, the solid electrolyte layer 11c and the like contract.

Due to such expansion and contraction of the solid electrolyte layer 11c and the like, the suitable target cell series resistance value also changes. For example, it is preferable to decrease the target cell series resistance value as the temperature of the all-solid-state battery 10 increases.

For this reason, in the all-solid-state battery control device 1A of the present embodiment, a table (hereinafter referred to as temperature - called target cell series resistance relationship table) is stored.

Further, the upper limit of the pressure also changes due to the expansion and contraction of the solid electrolyte layer 11c and the like due to the temperature of the all-solid-state battery 10 . Therefore, in the all-solid-state battery control device 1A of the present embodiment, a table showing the relationship between the temperature and the pressure upper limit value of the all-solid-state battery 10 (hereinafter referred to as a temperature-pressure upper limit relationship table) is stored in the storage unit 5d. ) is stored.

For example, the pressure adjustment unit 5b sets the target cell series resistance value from the detected temperature value input from the temperature detector 6 based on the temperature-target cell series resistance relationship table. The pressure adjustment unit 5b calculates the confining pressure based on this target cell series resistance value. Further, the pressure adjustment unit 5b adjusts the confining pressure by controlling the pressurizing mechanism 14 so that the confining pressure of the all-solid-state battery 10 becomes the calculated confining pressure.

Further, the pressure adjustment unit 5b sets the pressure upper limit value from the detected temperature value input from the temperature detector 6 based on the temperature-pressure upper limit value relationship table. In addition, the pressure adjustment unit 5b compares the confining pressure obtained based on the target cell series resistance value with the pressure upper limit, which is the upper limit of the confining pressure. Here, when the confining pressure obtained based on the cell series resistance exceeds the pressure upper limit, the pressure adjusting unit 5b limits the confining pressure of the all-solid-state battery 10 to the pressure upper limit.

FIG. 4 is a flowchart for explaining the operation of the all-solid-state battery control device 1A of this embodiment.

As shown in FIG. 4, in the all-solid-state battery control device 1A of the present embodiment, the temperature of the all-solid-state battery 10 is obtained before step S1 of the first embodiment (step S10). Here, the pressure adjustment unit 5 b acquires the temperature detection value output from the temperature detector 6 as the temperature of the all-solid-state battery 10 .

Subsequently, when calculating the confining pressure in step S2, the pressure adjustment unit 5b calculates the target cell series resistance value from the detected temperature value input from the temperature detector 6 based on the temperature-target cell series resistance relationship table. set.

Furthermore, the pressure adjustment unit 5b uses the set target cell series resistance value to calculate in step S1 the relationship table (table showing changes in cell series resistance value with respect to change in restraint pressure) stored in the storage unit 5d. Based on the obtained cell series resistance value, the confining pressure for achieving the target cell series resistance value stored in the storage unit 5d is calculated.

Further, as shown in FIG. 4, in the all-solid-state battery control device 1A of the present embodiment, the pressure upper limit value is set (step S11) before step S3 of the first embodiment. Here, the pressure adjustment unit 5b obtains the pressure upper limit value from the detected temperature value based on the temperature-pressure upper limit value relationship table stored in the storage unit 5d.

Then, the pressure adjustment part 5b performs step S3. Here, the pressure adjustment unit 5b uses the pressure upper limit value set in step S11 to determine whether or not the restraining pressure calculated in step S2 exceeds the pressure upper limit value.

The all-solid-state battery control device 1A of this embodiment as described above includes the temperature detector 6 that detects the temperature of the all-solid-state battery 10 . Also, the pressure adjustment unit 5 b sets a target cell series resistance value (constraining pressure) based on the temperature of the all-solid-state battery 10 . Therefore, it is possible to set a suitable target cell series resistance value (constraining pressure) according to the temperature of the all-solid-state battery 10 .

Further, the all-solid-state battery control device 1A of the present embodiment includes a temperature detector 6 that detects the temperature of the all-solid-state battery 10 . Moreover, the pressure adjustment unit 5 b changes the upper limit of pressure according to the detection value of the temperature detector 6 . Therefore, a suitable upper limit pressure value can be set according to the temperature of the all-solid-state battery 10 .

(Third embodiment)
Next, a third embodiment of the invention will be described. In the description of this embodiment, the description of the same parts as those of the first embodiment or the second embodiment will be omitted or simplified.

The all-solid-state battery control device of this embodiment includes a temperature detector 6 as in the second embodiment. In the all-solid-state battery 10, when the temperature of the all-solid-state battery 10 is relatively high, the solid electrolyte layer 11c and the like expand.

Moreover, in the all-solid-state battery 10, when the temperature of the all-solid-state battery 10 is relatively low, the solid electrolyte layer 11c and the like contract. It is preferable to change the abnormality detection process threshold according to the expansion or contraction of the solid electrolyte layer 11c or the like.

For this reason, in the all-solid-state battery control device of the present embodiment, a table showing the relationship between the temperature of the all-solid-state battery 10 and the threshold value for abnormality detection processing required (hereinafter referred to as temperature-abnormality detection processing required) is stored in the storage unit 5d. (referred to as a threshold relation table) is stored.

The abnormality determination unit 5c sets a threshold value for abnormality detection processing required from the detected temperature value input from the temperature detector 6 based on the temperature-required abnormality detection processing relationship table. The abnormality determination unit 5c executes the abnormality detection process when the difference between the estimated cell series resistance value and the adjusted cell series resistance value is equal to or greater than the abnormality detection process required threshold.

FIG. 5 is a flowchart for explaining the operation of the all-solid-state battery control of this embodiment. As shown in this figure, in the all-solid-state battery control device of the present embodiment, before step S8, as can be seen in comparison with the operation of the all-solid-state battery control device 1A of the second embodiment shown in FIG. , a threshold for abnormality detection processing required is set (step S20).

Here, the abnormality determination unit 5c sets the necessary abnormality detection process threshold. The abnormality determination unit 5c obtains the pressure upper limit value from the threshold for abnormality detection processing required based on the temperature-threshold value for abnormality detection processing required relationship table stored in the storage unit 5d.

Thereafter, the abnormality determination unit 5c determines whether or not the difference between the estimated cell series resistance value and the adjusted cell series resistance value is equal to or greater than the threshold for abnormality detection processing required set in step S20 (step S8).

The all-solid-state battery control device of this embodiment as described above includes the temperature detector 6 that detects the temperature of the all-solid-state battery 10 . Further, the abnormality determination unit 5 c sets a threshold for necessary abnormality detection processing based on the temperature of the all-solid-state battery 10 .

Further, when the difference between the estimated cell series resistance value and the adjusted cell series resistance value is greater than or equal to the threshold value for abnormality detection processing, the abnormality determination unit 5c performs abnormality detection processing. Therefore, it is possible to set a suitable abnormality detection processing threshold according to the temperature of the all-solid-state battery 10 .

(Fourth embodiment)
Next, a fourth embodiment of the invention will be described. In the description of this embodiment, the description of the same parts as those of the first embodiment or the second embodiment will be omitted or simplified.

The output of the all-solid-state battery 10 may not be stable when the temperature is low. Therefore, it is preferable to heat the all-solid-state battery 10 until the temperature of the all-solid-state battery 10 reaches a predetermined temperature. For this reason, in the all-solid-state battery control device of the present embodiment, the temperature required to raise the temperature of the all-solid-state battery 10 is stored as the detected value of the temperature detector in the storage unit 5d.

The pressure adjustment unit 5b compares the detected temperature value with the required temperature for heating. As a result, when the detected temperature value is equal to or lower than the required temperature rise, the pressure adjustment unit 5b lowers the confining pressure on the all-solid-state battery 10 below the confining pressure based on the target cell series resistance value.

By lowering the confining pressure in this way, the cell series resistance increases, and the amount of heat generated in the all-solid-state battery 10 increases. Therefore, when the temperature of the all-solid-state battery 10 is lowered, the all-solid-state battery 10 can be actively warmed by reducing the confining pressure.

FIG. 6 is a flowchart for explaining the operation of the all-solid-state battery control of this embodiment. As shown in this figure, in the all-solid-state battery control device of the present embodiment, before step S2, as can be seen in comparison with the operation of the all-solid-state battery control device 1A of the second embodiment shown in FIG. , a determination is made as to whether or not the detected temperature value is equal to or higher than the required temperature for heating (step S30).

When the pressure adjustment unit 5b determines in step S30 that the detected temperature value is not equal to or higher than the required temperature for heating, the process proceeds to step S3. On the other hand, when it is determined in step S30 that the detected temperature value is equal to or higher than the required temperature rise, the confining pressure is adjusted to be lower than the confining pressure corresponding to the target cell series resistance value (step S31). After that, the process returns to step S1 again.

The all-solid-state battery control device of this embodiment as described above includes the temperature detector 6 that detects the temperature of the all-solid-state battery 10 . Further, the abnormality determination unit 5 c sets a threshold for necessary abnormality detection processing based on the temperature of the all-solid-state battery 10 .

Further, when the detected value of the temperature detector is equal to or lower than the temperature required to raise the temperature of the all-solid-state battery 10, the pressure adjustment unit 5b determines that the pressure of the all-solid-state battery 10 is higher than the confining pressure based on the cell series resistance value. reduce the confining pressure on Therefore, it is possible to heat the all-solid-state battery 10 as needed.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above embodiments. The various shapes, combinations, and the like of the constituent members shown in the above-described embodiment are merely examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention.

For example, in the above embodiment, the configuration in which the control unit 5 includes the abnormality determination unit 5c as a functional unit has been described. However, the invention is not limited to this. For example, it is possible to employ a configuration in which the control unit 5 does not include the abnormality determination unit 5c as a functional unit. In other words, it is possible to employ a configuration in which the control unit 5 does not perform the abnormality determination process. In such a case, for example, step S6, step S7, step S8, and step S9 shown in the flowchart of FIG. 1 and the like are not performed.

1... All-solid battery control device, 1A... All-solid battery control device, 2... Voltage detector, 3... Current detector, 4... Alternating current generator, 5... Control unit, 5a... Cell series Resistance calculation unit (internal resistance calculation unit) 5b Pressure adjustment unit 5c Abnormality determination unit 5d Storage unit 6 Temperature detector 10 All-solid battery 11 Cell 11a ……Negative electrode mixture layer 11b ……Positive electrode mixture layer 11c ……Solid electrolyte layer 12 ……Negative electrode current collector 13 …… Positive electrode current collector 14 …… Pressure mechanism 14a …… Pressure plate , 14b... pressurizing piston, 15... battery case

Claims (6)

An all-solid-state battery control device for controlling the confining pressure of an all-solid-state battery having a solid electrolyte layer,
a voltage detector connected to the all-solid-state battery;
a current detector connected to the all-solid-state battery;
an internal resistance calculator that calculates an internal resistance value of the all-solid-state battery based on the detected value of the voltage detector and the detected value of the current detector;
and a pressure adjusting unit that adjusts the restraining pressure based on the internal resistance value. The pressure adjustment unit is
Comparing the pressure upper limit, which is the upper limit of the confining pressure, with the confining pressure obtained based on the internal resistance value,
The all-solid-state battery according to claim 1, wherein when the confining pressure obtained based on the internal resistance value exceeds the pressure upper limit, the confining pressure of the all-solid-state battery is limited to the pressure upper limit. Control device. A temperature detector that detects the temperature of the all-solid-state battery,
The all-solid-state battery control device according to claim 2, wherein the pressure adjustment unit changes the pressure upper limit according to the detection value of the temperature detector. An abnormality determination unit that determines the presence or absence of an abnormality in the all-solid-state battery,
The abnormality determination unit
Obtaining the internal resistance value after adjustment of the restraining pressure estimated from the restraining pressure obtained based on the internal resistance value as an estimated internal resistance value,
After adjustment of the restraining pressure, the internal resistance value of the all-solid-state battery is obtained as an adjusted internal resistance value based on the detected value of the voltage detector and the detected value of the current detector,
The all-solid-state battery control according to any one of claims 1 to 3, wherein the presence or absence of an abnormality in the all-solid-state battery is determined based on the difference between the estimated internal resistance value and the adjusted internal resistance value. Device. A temperature detector that detects the temperature of the all-solid-state battery,
The abnormality determination unit
setting an anomaly detection process threshold for performing the process of detecting the presence or absence of the anomaly according to the detected value of the temperature detector;
5. The apparatus according to claim 4, wherein when a difference between the estimated internal resistance value and the adjusted internal resistance value is greater than or equal to the abnormality detection processing threshold, the abnormality detection processing is performed. Solid state battery controller. A temperature detector that detects the temperature of the all-solid-state battery,
When the detected value of the temperature detector is equal to or lower than a temperature increase required temperature at which the temperature of the all-solid-state battery needs to be increased, the pressure adjustment unit adjusts the all-solid-state temperature higher than the confining pressure based on the internal resistance value. 6. The all-solid-state battery control device according to any one of claims 1 to 5, wherein the confining pressure on the battery is lowered.

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