A thermal battery equivalent circuit for simulating insulation degradation

Abstract

The present invention provides a thermal battery equivalent circuit for simulating insulation drop, including: an activation circuit and an internal equivalent circuit of a thermal battery; the internal equivalent circuit of the thermal battery includes a thermal battery activation circuit resistor and a thermal battery output circuit, and the thermal battery activation circuit resistor is respectively connected to the output end of the activation circuit and the thermal battery output circuit. The present invention simulates the insulation characteristics of the thermal battery after activation by using the activation circuit and the internal equivalent circuit of the thermal battery, and can be used to test the working condition of the corresponding thermal battery after activation, verify whether there is a latent path in the control system, and effectively avoid the problem of increased test cost due to the need to activate the thermal battery multiple times in the existing test method.

Description

Technical Field

[0001] The invention relates to the technical field of control system thermal batteries, in particular to a thermal battery equivalent circuit for simulating insulation degradation. Background Art

[0002] A thermal battery is a molten salt electrolyte storage battery. At room temperature, the electrolyte between the positive and negative electrodes is a non-conductive solid. When power is supplied, a direct current is used to activate the electric ignition head, thereby igniting the fireworks and heating source inside the thermal battery, melting the electrolyte and activating the battery. The activated thermal battery can provide the DC current and voltage required by electrical equipment.

[0003] In the test of verifying the correctness and reliability of the circuit design of the thermal battery control system, the existing test method usually directly activates the thermal battery to test the working performance of the thermal battery. Since the thermal battery is a one-time use product, if the real thermal battery is used in the comprehensive test, the test cost will be very high. And using the ground power supply to simulate the power supply of the thermal battery cannot represent the inherent phenomenon of the insulation performance degradation between the thermal battery activation circuit, the power supply circuit and the shell during the thermal battery activation process. Summary of the invention

[0004] The purpose of the embodiment of the present invention is to provide a thermal battery equivalent circuit for simulating insulation degradation, so as to solve the problem of high cost of existing thermal battery test methods.

[0005] A thermal battery equivalent circuit simulating insulation degradation, including:

[0006] An activation circuit, used for providing activation power;

[0007] The internal equivalent circuit of the thermal battery comprises a thermal battery activation loop resistor and a thermal battery output loop, wherein the thermal battery activation loop resistor is respectively connected to the output end of the activation loop and the thermal battery output loop.

[0008] Preferably, the thermal battery internal equivalent circuit further includes:

[0009] a first resistor, one end of the first resistor being connected to one end of the thermal battery output loop, and the other end of the first resistor being connected to one end of the thermal battery activation loop resistor;

[0010] A second resistor, one end of the second resistor is connected to the other end of the thermal battery output loop, and the other end of the second resistor is connected to the other end of the thermal battery activation loop resistor.

[0011] Preferably, the thermal battery internal equivalent circuit further includes:

[0012] A third resistor, one end of the third resistor is connected to one end of the thermal battery output loop, and the other end of the third resistor is connected to the other end of the thermal battery activation loop resistor.

[0013] Preferably, the thermal battery internal equivalent circuit further includes:

[0014] A fourth resistor, one end of the fourth resistor is connected to one end of the thermal battery output circuit, and the other end of the fourth resistor is connected to the first battery shell.

[0015] Preferably, the thermal battery internal equivalent circuit further includes:

[0016] A fifth resistor, one end of the fifth resistor is connected to the other end of the thermal battery output loop, and the other end of the fifth resistor is connected to the first battery shell.

[0017] Preferably, the thermal battery output circuit includes a thermal battery output module.

[0018] Preferably, the thermal battery output module is a lithium battery.

[0019] Preferably, the activation circuit comprises:

[0020] a switch, one end of the switch being connected to one end of the thermal battery activation loop resistor;

[0021] An activation power output module is provided, wherein one end of the activation power output module is connected to the other end of the switch, and the other end of the activation power output module is connected to the other end of the thermal battery activation loop resistor.

[0022] The beneficial effect of a thermal battery equivalent circuit for simulating insulation degradation provided by the present invention is that: compared with the prior art, the present invention simulates the insulation characteristics of the thermal battery after activation by utilizing an activation loop and an internal equivalent circuit of the thermal battery, which can be used to test the working condition of the corresponding thermal battery after activation and verify whether there is a latent path in the control system, effectively avoiding the problem of increased test costs due to the need to activate the thermal battery multiple times in the prior test method.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 An equivalent circuit diagram of a thermal battery simulating insulation degradation provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The purpose of the embodiment of the present invention is to provide a thermal battery equivalent circuit for simulating insulation degradation, so as to solve the problem of high cost of existing thermal battery test methods.

[0030] See also Figure 1 , a thermal battery equivalent circuit for simulating insulation degradation, comprising: an activation loop and an internal equivalent circuit of the thermal battery;

[0031] The activation circuit is used to provide an activation power source; the internal equivalent circuit of the thermal battery includes a thermal battery activation circuit resistor R and a thermal battery output circuit, and the thermal battery activation circuit resistor R is respectively connected to the output end of the activation circuit and the thermal battery output circuit.

[0032] Furthermore, the internal equivalent circuit of the thermal battery further includes: a first resistor X1, a second resistor X2, a third resistor X3, a fourth resistor X4 and a fifth resistor X5.

[0033] One end of the first resistor X1 is connected to one end of the thermal battery output circuit, and the other end of the first resistor X1 is connected to one end of the thermal battery activation circuit resistor R; one end of the second resistor X2 is connected to the other end of the thermal battery output circuit, and the other end of the second resistor X2 is connected to the other end of the thermal battery activation circuit resistor R. One end of the third resistor X3 is connected to one end of the thermal battery output circuit, and the other end of the third resistor X3 is connected to the other end of the thermal battery activation circuit resistor R. One end of the fourth resistor X4 is connected to one end of the thermal battery output circuit, and the other end of the fourth resistor X4 is connected to the first battery shell. One end of the fifth resistor X5 is connected to the other end of the thermal battery output circuit, and the other end of the fifth resistor X5 is connected to the first battery shell.

[0034] In the embodiment of the present invention, the thermal battery output circuit includes a thermal battery output module, and the thermal battery output module is a lithium battery, which is used to simulate the thermal battery voltage output.

[0035] It should be noted that the activation circuit in the present invention is implemented by a computer, and the activation circuit includes: a switch and an activation power output module.

[0036] One end of the switch is connected to one end of the thermal battery activation loop resistor R; the activation power output module, one end of the activation power output module is connected to the other end of the switch, and the other end of the activation power output module is connected to the other end of the thermal battery activation loop resistor R. The computer is used to provide a 28V activation power voltage (activation power output module), and laboratory personnel can use the computer to control the closing of the switch on the activation loop according to the test requirements.

[0037] The thermal battery equivalent circuit simulating insulation drop of the present invention is further described below in conjunction with specific embodiments:

[0038] The resistor R is the resistance of the thermal battery activation loop, and the resistance value before activation is about 3Ω, and the resistance value after activation is about several hundred ohms; after the thermal battery is activated, a high-temperature chemical reaction occurs inside to generate high-temperature gas ions, and an ion atmosphere is generated inside the thermal battery. Due to the presence of the ion atmosphere, ions migrate and the activation loop wire carries a certain charge; in addition, due to the diffusion of gaseous ions, a weak conductive channel exists between the conductive sheet led from the battery stack and the shell or the activation loop, thereby causing the insulation resistance between the thermal battery output loop and the activation loop to decrease, and the insulation resistance of the thermal battery output loop to the shell to decrease. Therefore, the present invention sets a total of 5 resistors, namely, resistor X1, resistor X2, resistor X3, resistor X4, and resistor X5, to simulate the insulation resistance between the thermal battery output loop and the activation loop, and between the thermal battery output loop and the shell during the thermal battery activation process; the power supply U simulates the voltage output of the thermal battery using a lithium battery, and the power supply U provides a 28VDC power output to the outside.

[0039] Furthermore, in the circuit connection diagram mentioned in the thermal battery equivalent test method simulating insulation degradation, the resistance of the resistor X1 used in the present invention is 20KΩ, the resistance of the resistor X2 is 1KΩ, the resistance of the resistor X3 is 80KΩ, the resistance of the resistor X4 is 2KΩ, and the resistance of the resistor X5 is 2KΩ (the specific resistance value needs to be specifically designed according to the thermal battery model). Before connecting the resistors in series, the resistors need to be measured to ensure that the resistance is normal; if conditions permit, two resistors can be connected in series to avoid failures caused by failure of a single resistor; the resistor connection needs to be wrapped with insulating tape to ensure that the metal connection part is not exposed; the power supply voltage is observed during the test. If the voltage or current is abnormal, the power supply should be turned off quickly; after the test, it is necessary to ensure that the power supply is disconnected when replacing or removing the resistor.

[0040] The present invention provides a thermal battery equivalent circuit for simulating insulation degradation, which is mainly composed of a lithium battery and a plurality of resistors of different resistance values. The plurality of resistors of different resistance values ​​are generally selected from resistors in the resistance range of 500Ω to 100KΩ. The present invention uses a lithium battery to replace a real thermal battery to realize battery power supply, and simulates the inherent characteristics of insulation degradation after activation of the thermal battery, so as to test the working condition of the thermal battery control system after the thermal battery is activated, and can verify whether there is a latent path in the corresponding thermal battery, so as to facilitate the improvement of the thermal battery by relevant personnel, and effectively avoid the problem that the existing test method needs to activate the thermal battery multiple times, resulting in increased test costs.

[0041] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technical solution that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A thermal battery equivalent circuit simulating insulation degradation, characterized in that: include: An activation circuit, used for providing activation power; The internal equivalent circuit of the thermal battery comprises a thermal battery activation loop resistor and a thermal battery output loop, wherein the thermal battery activation loop resistor is respectively connected to the output end of the activation loop and the thermal battery output loop; The thermal battery internal equivalent circuit also includes: a first resistor, one end of the first resistor being connected to one end of the thermal battery output loop, and the other end of the first resistor being connected to one end of the thermal battery activation loop resistor; a second resistor, one end of the second resistor being connected to the other end of the thermal battery output loop, and the other end of the second resistor being connected to the other end of the thermal battery activation loop resistor; The thermal battery internal equivalent circuit also includes: a third resistor, one end of the third resistor being connected to one end of the thermal battery output loop, and the other end of the third resistor being connected to the other end of the thermal battery activation loop resistor; The thermal battery internal equivalent circuit also includes: a fourth resistor, one end of the fourth resistor being connected to one end of the thermal battery output circuit, and the other end of the fourth resistor being connected to the first battery shell; The thermal battery internal equivalent circuit also includes: A fifth resistor, one end of the fifth resistor is connected to the other end of the thermal battery output loop, and the other end of the fifth resistor is connected to the first battery shell.

2. A thermal battery equivalent circuit for simulating insulation degradation according to claim 1, characterized in that: The thermal battery output circuit includes a thermal battery output module.

3. A thermal battery equivalent circuit for simulating insulation degradation according to claim 1, characterized in that: The thermal battery output module is a lithium battery.

4. A thermal battery equivalent circuit for simulating insulation degradation according to claim 1, characterized in that: The activation circuit comprises: a switch, one end of the switch being connected to one end of the thermal battery activation loop resistor; An activation power output module is provided, wherein one end of the activation power output module is connected to the other end of the switch, and the other end of the activation power output module is connected to the other end of the thermal battery activation loop resistor.

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