Energy storage battery performance detection device

Abstract

The utility model belongs to the technical field of energy storage batteries, and particularly relates to an energy storage battery performance detection device. Battery state detection can be effectively carried out, and safe operation of the energy storage battery is ensured. Comprising a CPU main control module, a current detection circuit, a voltage detection circuit and a battery surface temperature detection circuit. The CPU master control module is connected with the current detection circuit, the voltage detection circuit and the battery surface temperature detection circuit. The current detection circuit is connected with a current sensor, and the current sensor is used for detecting the current of the energy storage battery. And the voltage detection circuit is connected with the Hall voltage sensor. The battery surface temperature detection circuit is connected with a battery temperature sensor; and the battery temperature sensor is used for detecting the surface temperature of the battery.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage batteries, and in particular relates to an energy storage battery performance detection device. Background Art

[0002] As a key component in modern energy systems, energy storage batteries will experience a series of complex chemical changes and physical wear and tear in their internal active substances, such as positive and negative electrode materials and electrolytes, during long-term service. This phenomenon is usually referred to as "battery aging". Aging will not only gradually erode the battery's storage capacity, significantly reducing its rated capacity, but also increase the battery's internal resistance, which directly affects the battery's charging and discharging efficiency and maximum output power, thereby reducing the efficiency of the entire energy storage system.

[0003] In an energy storage battery pack composed of multiple battery cells connected in series, due to differences in manufacturing processes or uneven usage conditions, it is difficult to maintain perfect synchronization of the performance consistency of each battery cell (cell). Over time, this inconsistency will be amplified, and some batteries may be exhausted prematurely or undercharged, thus becoming a "short board", limiting the charge and discharge capacity and cycle life of the entire battery pack, and ultimately leading to a significant decline in system performance.

[0004] What needs to be more vigilant is that energy storage batteries also have hidden risks such as overcharging, over-discharging, and thermal runaway during operation. Overcharging may cause the internal pressure of the battery to increase, causing electrolyte decomposition or even explosion; while over-discharging may cause permanent damage to the battery structure. Thermal runaway is an extremely dangerous situation. It occurs when the battery temperature rises out of control and may quickly cause a fire or explosion. Therefore, establishing a complete battery performance detection system and regularly performing battery status detection and maintenance are the key to ensuring the safe operation of the energy storage system. Therefore, regular testing and continuous monitoring are necessary measures to ensure the healthy and efficient operation of energy storage batteries. Summary of the invention

[0005] The utility model aims at solving the defects in the prior art and provides a device for detecting the performance of an energy storage battery.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme, including a CPU main control module, a current detection circuit, a voltage detection circuit, and a battery surface temperature detection circuit. The CPU main control module is connected to the current detection circuit, the voltage detection circuit, and the battery surface temperature detection circuit respectively. The current detection circuit is connected to a current sensor, and the current sensor is used to detect the current of the energy storage battery. The voltage detection circuit is connected to a Hall voltage sensor. The battery surface temperature detection circuit is connected to a battery temperature sensor, and the battery temperature sensor is used to detect the battery surface temperature.

[0007] Furthermore, the current detection circuit includes a dual operational amplifier CA1, wherein the dual operational amplifier CA1 is LM358; wherein, pin 4 of CA1 is grounded, and pin 8 is connected to a +5V power supply; pin 2 of CA1 is grounded through a resistor R7, and pin 2 of CA1 is also connected to pin 1 of CA1 through a resistor R8; pin 1 of CA1 is connected to a CPU main control module through a resistor R9, and one end of the resistor R9 connected to the CPU main control module is connected to a parallel branch, and the parallel branch includes capacitors C13, a voltage regulator diode D5, and a diode D6 connected in parallel, and the first common end of the three is connected to the resistor R 9, and the second common ends of the three are grounded; the 6th pin of CA1 is connected to the 7th pin and the 3rd pin respectively, and the 5th pin of CA1 is connected to the current sensor through a series branch composed of a resistor R4 and a resistor R6. The end of the resistor R4 connected to the current sensor is grounded through a capacitor C11, and the end of the resistor R4 connected to the resistor R6 is grounded through a resistor R5 at the same time; the end of the resistor R6 connected to CA1 is also grounded through a capacitor C12; the end of the resistor R6 connected to CA1 is also connected to the anode of the diode D3 and the cathode of the diode D4 respectively, the cathode of the diode D3 is connected to the +5V power supply, and the anode of the diode D4 is grounded.

[0008] Furthermore, the voltage detection circuit includes a dual operational amplifier CA2, wherein the dual operational amplifier CA2 model is LM358; wherein, pin 4 of CA2 is connected to a -15V power supply, and pin 8 is connected to a +15V power supply; pin 2 of CA2 is grounded through resistors R12 and R13 connected in series, and pin 2 of CA2 is also connected to pin 1 of CA2 through resistor R14; a common connection point of resistors R12 and R13 is connected to a Hall voltage sensor; pin 1 of CA2 is connected to pin 6 of CA2 through resistor R17, and pin 6 of CA2 is connected to CA2 through resistor R18. 2, and the 7th pin of CA2 is connected to the CPU main control module through two resistors R21 and R22 connected in series (specifically connected to the 24th pin of MM32F3273E7PV;) the common connection point of the resistor R21 and the resistor R22 is grounded through the capacitor C14, and the end of the resistor R22 connected to the CPU main control module is grounded through a parallel branch composed of diodes D7 and D18; the 5th pin of CA2 is grounded through a parallel branch composed of resistors R19 and R20, and the 3rd pin of CA2 is grounded through a parallel branch composed of resistors R15 and R16.

[0009] Furthermore, the battery surface temperature detection circuit includes a dual operational amplifier CA3, wherein the dual operational amplifier CA3 is LM358; wherein, pin 4 of CA3 is grounded, and pin 8 is connected to a +5V power supply; pin 2 of CA3 is connected to pin 1 of CA3, pin 1 of CA3 is connected to pin 6 of CA3 through resistor R25, and pin 6 of CA3 is connected to pin 7 of CA3 through resistor R26; pin 7 of CA3 is connected to a CPU main control module through resistor R27 (specifically connected to pin 23 of MM32F3273E7PV;) one end of resistor R27 connected to the CPU main control module is connected to a parallel branch, and the parallel branch includes capacitors C17, voltage regulator diode D10, and diode D11 connected in parallel, the first common end of the three is connected to resistor R27, and the second common end of the three is grounded; resistor R23 is connected in series with resistor R24 After that, the common end is connected to pin 3 of CA3, the free end of resistor R23 is connected to +5V, and the free end of resistor R24 ​​is grounded; pin 5 of CA3 is connected to pin 1 of dual operational amplifier CA5 through resistor R59, and pin 5 of CA3 is also grounded through resistor R60; the model of dual operational amplifier CA5 is LM358; pin 4 of CA5 is grounded, and pin 8 is connected to +5V power supply; pin 2 of CA5 is connected to pin 1 of CA5, and pin 3 of CA5 is connected to the battery temperature sensor through resistor R29 (the battery temperature sensor adopts PT1000 platinum thermal resistor), the first end of resistor R29 is grounded through capacitor C15, and the second end of resistor R29 is grounded through capacitor C16; after the anode of diode D8 is connected to the cathode of diode D9, the common connection point is connected to pin 3 of CA5; the cathode of diode D8 is connected to the +5V power supply, and the anode of diode D9 is grounded.

[0010] Compared with the prior art, the utility model has beneficial effects.

[0011] The utility model adopts current detection circuit, voltage detection circuit, battery surface temperature detection circuit, ambient temperature detection circuit, etc. to effectively detect the performance of energy storage battery, wherein: the current detection circuit is used to accurately detect the charging current of the battery, the voltage detection circuit is used to accurately detect the voltage of the battery, and the charging amount obtained by the battery during the charging process can be calculated by the charging current value and the battery voltage value. The battery surface temperature detection circuit is used to detect the battery surface temperature. It effectively detects the battery status and ensures the safe operation of the energy storage battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods. The protection scope of the utility model is not limited to the following descriptions.

[0013] Figure 1 It is the schematic diagram of the CPU main control module and its peripheral circuits.

[0014] Figure 2 This is the schematic diagram of the current detection circuit.

[0015] Figure 3 This is the schematic diagram of the voltage detection circuit.

[0016] Figure 4 This is the schematic diagram of the battery surface temperature detection circuit. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and beneficial effects of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments.

[0018] like Figure 1-4 As shown, the specific embodiment includes a CPU main control module, a current detection circuit, a voltage detection circuit, a battery surface temperature detection circuit, and an ambient temperature detection circuit. The CPU main control module is connected to the current detection circuit, the voltage detection circuit, and the battery surface temperature detection circuit respectively. The current detection circuit is connected to a current sensor, and the current sensor is used to detect the current of the energy storage battery. The voltage detection circuit is connected to a Hall voltage sensor. The battery surface temperature detection circuit is connected to a battery temperature sensor, and the battery temperature sensor is used to detect the battery surface temperature.

[0019] Preferably, the current detection circuit includes a dual operational amplifier CA1, wherein the dual operational amplifier CA1 model is LM358; wherein, pin 4 of CA1 is grounded, and pin 8 is connected to a +5V power supply; pin 2 of CA1 is grounded through a resistor R7, and pin 2 of CA1 is also connected to pin 1 of CA1 through a resistor R8; pin 1 of CA1 is connected to a CPU main control module through a resistor R9 (specifically connected to pin 27 of MM32F3273E7PV); and one end of the resistor R9 connected to the CPU main control module is connected to a parallel branch, and the parallel branch includes capacitors C13, a voltage regulator diode D5, and a diode D6 connected in parallel, three The first common end of the three is connected to the resistor R9, and the second common ends of the three are grounded; the 6th pin of CA1 is connected to the 7th pin and the 3rd pin respectively, and the 5th pin of CA1 is connected to the current sensor through the series branch composed of the resistor R4 and the resistor R6. The end of the resistor R4 connected to the current sensor is grounded through the capacitor C11, and the end of the resistor R4 connected to the resistor R6 is also grounded through the resistor R5; the end of the resistor R6 connected to CA1 is also grounded through the capacitor C12; the end of the resistor R6 connected to CA1 is also connected to the anode of the diode D3 and the cathode of the diode D4 respectively, the cathode of the diode D3 is connected to the +5V power supply, and the anode of the diode D4 is grounded.

[0020] The working principle of the current detection circuit is as follows: the detected charging current outputs a voltage signal 1 in the range of 0-5V in proportion through the Hall current sensor U2, and the voltage signal 1 is stabilized by the capacitor C11. The voltage signal 1 is divided by resistors R4 and R5 to become a voltage signal 2 in the range of 0-3V. The voltage signal 2 is filtered by resistor R6 and capacitor C12, and then clamped by diodes D3 and D4 to make the voltage signal not lower than 0V and not higher than 5V. The voltage signal 2 is converted into a voltage signal 3 through a voltage follower circuit composed of an operational discharger CA1B, and the voltage follower circuit realizes signal isolation and improves the signal's load capacity. The voltage signal 3 is converted into a voltage signal 4 through an operational amplifier circuit composed of an operational discharger CA1A, R7 and R8, so that the voltage signal changes from a range of 0-3V to a range of 0-3.3V. The voltage signal 4 is filtered by resistor R9 and capacitor C13, and then clamped by voltage stabilizing diode D5 and diode D6, so that the voltage signal is not less than 0 V and not more than 3.3 V. The voltage signal 4 is connected to the analog-to-digital conversion interface of the CPU main control module.

[0021] Preferably, the voltage detection circuit includes a dual operational amplifier CA2, wherein the dual operational amplifier CA2 is LM358; the dual operational amplifier CA2 includes two parts CA2A and CA2B; wherein the 4th pin of CA2 is connected to a -15V power supply, and the 8th pin is connected to a +15V power supply; the 2nd pin of CA2 is grounded through a resistor R12 and a resistor R13 connected in series, and the 2nd pin of CA2 is also connected to the 1st pin of CA2 through a resistor R14; the common connection point of the resistor R12 and the resistor R13 is connected to the Hall voltage sensor; the 1st pin of CA2 is connected to the C through a resistor R17 Pin 6 of A2 is connected, pin 6 of CA2 is connected to pin 7 of CA2 through resistor R18, pin 7 of CA2 is connected to the CPU main control module through two resistors R21 and R22 connected in series, the common connection point of resistor R21 and resistor R22 is grounded through capacitor C14, and the end of resistor R22 connected to the CPU main control module is grounded through a parallel branch composed of diodes D7 and D18; pin 5 of CA2 is grounded through a parallel branch composed of resistor R19 and resistor R20, and pin 3 of CA2 is grounded through a parallel branch composed of resistor R15 and resistor R16.

[0022] The working principle of the voltage detection circuit is as follows: the detected battery voltage (voltage range 0-50V) is converted into a current signal 1 in the range of 0-10mA through R10 and R11. The current signal 1 is converted into a current signal 2 in the range of 0-25mA through the Hall voltage sensor U3. The current signal 2 is converted into a voltage signal 5 in the range of 0-3V through the resistor R12. The voltage signal 5 is converted into an inverted 0-(-3.3V) voltage signal 6 through the inverting operational amplifier circuit composed of the operational discharger CA2A, R13, R14, R15 and R16, and the voltage signal 6 is converted into a non-inverted 0-3.3V voltage signal 7 through the inverting operational amplifier circuit composed of the operational discharger CA2B, R17, R18, R19 and R20. The voltage signal 7 is filtered through the resistor-capacitor circuit composed of resistors R21, R22 and capacitor C14, and then the voltage signal 7 is clamped through the voltage stabilizing diode D7 and the diode D18, so that the voltage signal is not lower than 0V and not higher than 3.3V. The voltage signal 7 is connected to the analog-to-digital conversion interface of the CPU main control module.

[0023] Preferably, the battery surface temperature detection circuit includes a dual operational amplifier CA3, wherein the dual operational amplifier CA3 is LM358; wherein the 4th pin of CA3 is grounded, and the 8th pin is connected to the +5V power supply; the 2nd pin of CA3 is connected to the 1st pin of CA3, the 1st pin of CA3 is connected to the 6th pin of CA3 through the resistor R25, and the 6th pin of CA3 is connected to the 7th pin of CA3 through the resistor R26; the 7th pin of CA3 is connected to the CPU main control module through the resistor R27, and the end of the resistor R27 connected to the CPU main control module is connected to a parallel branch, and the parallel branch includes capacitors C17, a voltage regulator diode D10, and a diode D11 connected in parallel, and the first common end of the three is connected to the resistor R27, and the second common end of the three is grounded; after the resistor R23 is connected in series with the resistor R24, the common The free end of resistor R23 is connected to pin 3 of CA3, the free end of resistor R24 ​​is grounded; pin 5 of CA3 is connected to pin 1 of dual operational amplifier CA5 through resistor R59, and pin 5 of CA3 is also grounded through resistor R60; the model of dual operational amplifier CA5 is LM358; pin 4 of CA5 is grounded, and pin 8 is connected to +5V power supply; pin 2 of CA5 is connected to pin 1 of CA5, and pin 3 of CA5 is connected to the battery temperature sensor through resistor R29, the first end of resistor R29 is grounded through capacitor C15, and the second end of resistor R29 is grounded through capacitor C16; after the anode of diode D8 is connected to the cathode of diode D9, the common connection point is connected to pin 3 of CA5; the cathode of diode D8 is connected to the +5V power supply, and the anode of diode D9 is grounded.

[0024] The working principle of the battery surface temperature detection circuit is as follows: a +5V reference voltage source 1 is generated through the reference voltage source chip U4, and the +5V reference voltage source 1 supplies power to the resistor R28 and the platinum resistance temperature sensor PE1 connected in series, and a voltage signal 8 corresponding to the detected battery surface temperature is obtained from PE1 (the battery surface temperature range in this system is 0-90°C, and the output voltage signal range corresponding to PE1 is 2.5-2.9V). The voltage signal 8 is filtered by capacitor C15, capacitor C16 and resistor R29, and then the voltage signal 8 is clamped by diodes D8 and D9, so that the voltage signal is not lower than 0V and not higher than 5V. Then the voltage signal 8 is converted into a voltage signal 9 through a voltage follower circuit formed by an operational discharger CA5A, and the voltage follower circuit realizes signal isolation and improves the signal's carrying capacity. The +5V reference voltage source 1 generates a 2.5V voltage signal through the voltage divider of resistors R23 and R24. The 2.5V voltage signal is isolated and improved by the voltage follower circuit formed by the operational discharger CA3A. The voltage signal 9 is subtracted from the 2.5V voltage signal by the operational amplifier circuit composed of the operational discharger CA3B, R25, R26, R59 and R60, and then amplified to output the voltage signal 10. The voltage signal 10 is filtered by the resistor R27 and the capacitor C17, and then clamped by the voltage zener diode D10 and the diode D11, so that the voltage signal is not less than 0V and not higher than 3.3V. The voltage signal 10 is connected to the analog-to-digital conversion interface of the CPU main control module.

[0025] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. Therefore, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope defined by the claims of the present invention.

Claims

1. Energy storage battery performance detection device, characterized in that: It includes CPU main control module, current detection circuit, voltage detection circuit, battery surface temperature detection circuit and ambient temperature detection circuit; The CPU main control module is respectively connected to the current detection circuit, the voltage detection circuit, and the battery surface temperature detection circuit; The current detection circuit is connected to a current sensor, and the current sensor is used to detect the current of the energy storage battery; The voltage detection circuit is connected to the Hall voltage sensor; The battery surface temperature detection circuit is connected to a battery temperature sensor, and the battery temperature sensor is used to detect the battery surface temperature.

2. The energy storage battery performance detection device according to claim 1, characterized in that: The current detection circuit includes a dual operational amplifier CA1, wherein the dual operational amplifier CA1 is LM358; wherein the 4th pin of CA1 is grounded, and the 8th pin is connected to a +5V power supply; the 2nd pin of CA1 is grounded through a resistor R7, and the 2nd pin of CA1 is also connected to the 1st pin of CA1 through a resistor R8; the 1st pin of CA1 is connected to the CPU main control module through a resistor R9, and one end of the resistor R9 connected to the CPU main control module is connected to a parallel branch, and the parallel branch includes capacitors C13, a voltage stabilizing diode D5, and a diode D6 connected in parallel, and the first common end of the three is connected to the resistor R9 , the second common terminals of the three are grounded; pin 6 of CA1 is connected to pin 7 and pin 3 respectively, pin 5 of CA1 is connected to the current sensor through a series branch composed of resistor R4 and resistor R6, the end of resistor R4 connected to the current sensor is grounded through capacitor C11, and the end of resistor R4 connected to resistor R6 is also grounded through resistor R5; the end of resistor R6 connected to CA1 is also grounded through capacitor C12; the end of resistor R6 connected to CA1 is also connected to the anode of diode D3 and the cathode of diode D4 respectively, the cathode of diode D3 is connected to the +5V power supply, and the anode of diode D4 is grounded.

3. The energy storage battery performance detection device according to claim 1, characterized in that: The voltage detection circuit includes a dual operational amplifier CA2, wherein the dual operational amplifier CA2 is LM358; wherein the 4th pin of CA2 is connected to a -15V power supply, and the 8th pin is connected to a +15V power supply; the 2nd pin of CA2 is grounded through a resistor R12 and a resistor R13 connected in series, and the 2nd pin of CA2 is also connected to the 1st pin of CA2 through a resistor R14; the common connection point of the resistor R12 and the resistor R13 is connected to the Hall voltage sensor; the 1st pin of CA2 is connected to the 6th pin of CA2 through a resistor R17, and the 6th pin of CA2 is connected to the Hall voltage sensor; The pin is connected to the 7th pin of CA2 through the resistor R18, and the 7th pin of CA2 is connected to the CPU main control module through two resistors R21 and R22 connected in series. The common connection point of the resistor R21 and the resistor R22 is grounded through the capacitor C14, and the end of the resistor R22 connected to the CPU main control module is grounded through the parallel branch composed of diodes D7 and D18; the 5th pin of CA2 is grounded through the parallel branch composed of resistors R19 and R20, and the 3rd pin of CA2 is grounded through the parallel branch composed of resistors R15 and R16.

4. The energy storage battery performance detection device according to claim 1, characterized in that: The battery surface temperature detection circuit includes a dual operational amplifier CA3, wherein the dual operational amplifier CA3 is LM358; wherein the 4th pin of CA3 is grounded, and the 8th pin is connected to a +5V power supply; the 2nd pin of CA3 is connected to the 1st pin of CA3, the 1st pin of CA3 is connected to the 6th pin of CA3 through a resistor R25, and the 6th pin of CA3 is connected to the 7th pin of CA3 through a resistor R26; the 7th pin of CA3 is connected to the CPU main control module through a resistor R27, and one end of the resistor R27 connected to the CPU main control module is connected to a parallel branch, and the parallel branch includes capacitors C17, a voltage stabilizing diode D10, and a diode D11 connected in parallel, the first common end of the three is connected to the resistor R27, and the second common end of the three is grounded; after the resistor R23 is connected in series with the resistor R24, the common end Connected to pin 3 of CA3, the free end of resistor R23 is connected to +5V, and the free end of resistor R24 ​​is grounded; pin 5 of CA3 is connected to pin 1 of dual operational amplifier CA5 through resistor R59, and pin 5 of CA3 is also grounded through resistor R60; the model of dual operational amplifier CA5 is LM358; pin 4 of CA5 is grounded, and pin 8 is connected to +5V power supply; pin 2 of CA5 is connected to pin 1 of CA5, and pin 3 of CA5 is connected to the battery temperature sensor through resistor R29, the first end of resistor R29 is grounded through capacitor C15, and the second end of resistor R29 is grounded through capacitor C16; after the anode of diode D8 is connected to the cathode of diode D9, the common connection point is connected to pin 3 of CA5; the cathode of diode D8 is connected to the +5V power supply, and the anode of diode D9 is grounded.

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