Battery system

Abstract

To provide a battery system capable of improving the accuracy of measuring the temperature of a battery cell.SOLUTION: A battery system 1 is equipped with a control unit 4, and the control unit 4 acquires gas components in a battery cell 2 measured by a gas sensor 3 and the amount of each gas component generated, and calculates the temperature of the battery cell 2 on the basis of the gas components and the amount of generation.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a battery system. [Background technology]

[0002] Patent Document 1 discloses a battery unit that is provided in a battery stack in which multiple battery cells are stacked in the stacking direction, and that has a positive temperature characteristic thermistor that has positive resistance characteristics in which the resistance value increases with increasing temperature, and a negative temperature characteristic thermistor that has negative resistance characteristics in which the resistance value decreases with increasing temperature. This technology controls the battery unit based on the cell temperatures measured by the positive temperature characteristic thermistor and the negative temperature characteristic thermistor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-061471 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in Patent Document 1, although the temperature differs for each battery cell, there are only two thermistors, which causes a problem of low accuracy in measuring the temperature of the battery cells.

[0005] The present disclosure has been made in consideration of the above, and has an object to provide a battery system that can improve the accuracy of measuring the temperature of a battery cell. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the objective, the battery system of the present disclosure is a battery system in which a gas sensor is provided in each battery cell, and which includes a processor, wherein the processor acquires gas components in the battery cell and the amount of each gas component generated measured by the gas sensor, and calculates the temperature of the battery cell based on the gas components and the amount of generation. Effect of the Invention

[0007] According to the present disclosure, an effect is achieved in that the accuracy of measuring the temperature of a battery cell can be improved. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a battery system according to an embodiment. [Diagram 2] FIG. 2 is a flowchart showing an overview of the process executed by the battery system according to one embodiment. [Diagram 3] FIG. 3 is a flowchart showing an outline of an abnormality determination process executed by an electronic system according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a battery system according to an embodiment of the present disclosure will be described with reference to the drawings. Note that the components in the following embodiments include those that are replaceable and easy for a person skilled in the art, or those that are substantially the same. Also, each figure referred to in the following description merely shows the shape, size, and positional relationship in a schematic manner to the extent that the contents of the present disclosure can be understood. In other words, the present disclosure is not limited to only the shape, size, and positional relationship exemplified in each figure.

[0010] [Battery system configuration] Fig. 1 is a diagram showing a schematic configuration of a battery system according to one embodiment. The battery system 1 shown in Fig. 1 includes a battery cell 2, a gas sensor 3, and a control unit 4. In the battery system 1 shown in Fig. 1, a plurality of battery cells 2 are stacked in one direction, for example, in a stacking direction. In the following, for the sake of simplicity, the case of one battery cell 2 will be described.

[0011] The battery cells 2 are flat plate-shaped and may have either a bipolar structure or a monopolar structure.

[0012] The gas sensor 3 is provided in the battery cell 2, measures the gas components in the battery cell 2 and the amount (concentration) of each gas component generated, and outputs the measurement result to the control unit 4. The gas sensor 3 is configured using, for example, a physical sensor capable of measuring the physical quantity of gas, or a chemical sensor such as a catalytic combustion sensor that converts the gas into an electrical quantity by utilizing a chemical reaction with the gas, a semiconductor sensor, or a constant potential electrolysis sensor.

[0013] The control unit 4 is realized by using a processor having a memory and hardware. The hardware is, for example, a memory, a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and an FPGA (Field-Programmable Gate Array). The control unit 4 acquires the gas components in the battery cell 2 measured by the gas sensor 3 and the amount of each gas component generated, and calculates the temperature of the battery cell 2 based on the gas components and the amount of each gas component generated. The control unit 4 also controls the battery cell 2 based on the temperature of the battery cell 2. In one embodiment, the control unit 4 functions as a processor.

[0014] [Battery System Processing] Next, a description will be given of the processing executed by the battery system 1. FIG 2 is a flowchart showing an outline of the processing executed by the battery system 1.

[0015] 2, the control unit 4 acquires from the gas sensor 3 gas components generated within the battery cell 2, and from the battery cell 2 the current of the battery cell 2 and the voltage of the battery cell 2 (step S101). Specifically, the control unit 4 acquires CO (carbon monoxide), CO2 (carbon dioxide), and CH (methane, etc.) as the gas components within the battery cell 2 measured by the gas sensor 3. In this case, the control unit 4 records the accumulated amount of each gas component in the memory.

[0016] Next, the control unit 4 calculates the cell internal temperature of the battery cell 2 based on the gas components acquired in step S101 (step S102), and records the accumulation time for each cell internal temperature in memory (step S103). Specifically, the control unit 4 calculates the cell internal temperature of the battery cell 2 based on the gas components and the amount of each gas component generated. This makes it possible to improve the accuracy of measuring the temperature of the battery cell 2.

[0017] Thereafter, the control unit 4 calculates the cell deterioration level (resistance value) of the battery cell 2 based on the temperature accumulation time (step S104).

[0018] Next, the control unit 4 calculates the current and voltage of the battery cell 2 acquired in step S101. Based on this, the cell deterioration level of the battery cell 2 is calculated (step S105).

[0019] Thereafter, the control unit 4 compares the cell deterioration level of the battery cell 2 calculated in step S104 with the cell deterioration level of the battery cell 2 calculated in step S105, and adopts the cell deterioration level with the greater degree of deterioration (step S106).

[0020] Next, the control unit 4 performs cell input / output control and cooling control of the battery cell 2 based on the cell deterioration level adopted in step S106 and the cell internal temperature calculated in step S102 (step S107). This allows accurate temperature measurement of the battery cell 2, thereby enabling more accurate cell control of the battery cell 2. After step S107, the battery system 1 ends this process.

[0021] [Battery System Abnormality Determination Processing] Next, a description will be given of the abnormality determination process executed by the battery system 1. FIG 3 is a flowchart showing an outline of the abnormality determination process executed by the battery system 1.

[0022] 3, the control unit 4 acquires gas components generated in the battery cell 2 from the gas sensor 3 (step S201) and records the cumulative generation amount of the generated gas components in memory (step S202). Specifically, the control unit 4 records the cumulative generation amount for each generated gas component.

[0023] Next, the control unit 4 calculates the internal level inside the battery cell 2 based on the cumulative amount of generated gas components recorded in the memory (step S203).

[0024] Thereafter, the control unit 4 determines whether the internal pressure level of the battery cell 2 is equal to or higher than a threshold value (step S204). Here, the threshold value is a value for preventing leakage of battery cell 2. If the control unit 4 determines that the internal pressure level of the battery cell 2 is equal to or higher than the threshold value (step S204: Yes), the control unit 4 controls the output of the battery cell 2 (step S205). This makes it possible to prevent damage such as leakage caused by an increase in the internal pressure of the battery cell 2. After step S205, the battery system 1 ends this process. On the other hand, if the control unit 4 determines that the internal pressure level of the battery cell 2 is not equal to or higher than the threshold value (step S204: No), the battery system 1 ends this process.

[0025] According to the embodiment described above, the control unit 4 acquires the gas components in the battery cell 2 measured by the gas sensor 3 and the amount of each gas component generated, and calculates the temperature of the battery cell 2 based on the gas components and the amount of generation, thereby improving the accuracy of measuring the temperature of the battery cell 2.

[0026] Furthermore, according to one embodiment, the control unit 4 performs cell input / output control and cooling control of the battery cell 2 based on the cell deterioration level and the cell internal temperature, so that the cell control of the battery cell 2 can be performed with higher accuracy.

[0027] Furthermore, according to one embodiment, when it is determined that the internal pressure level of the battery cell 2 is equal to or higher than a threshold value, the control unit 4 controls the output of the battery cell 2, thereby making it possible to prevent damage such as leakage caused by an increase in the internal pressure of the battery cell 2.

[0028] Further advantages and modifications may readily occur to those skilled in the art. The invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Thus, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof.

[0029] Although some of the embodiments of the present application have been described in detail above with reference to the drawings, these are merely examples, and the present invention can be embodied in other forms that incorporate various modifications and improvements based on the knowledge of those skilled in the art, including the forms described in the disclosure of the present invention. [Explanation of symbols]

[0030] 1 Battery system vehicle 2 Battery Cells 3 Gas Sensor 4. Control Unit

Claims

[Claim 1] A battery system in which a gas sensor is provided in each battery cell, A processor is provided. The processor, Acquire the gas components in the battery cell and the generation amount of each gas component measured by the gas sensor; calculating a temperature of the battery cell based on the gas components and the amounts of the gas generated; Battery system.

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