WO2018058315A1

WO2018058315A1 - Method and apparatus for voltage hysteresis determination and activation of lithium-thionyl chloride battery

Info

Publication number: WO2018058315A1
Application number: PCT/CN2016/100374
Authority: WO
Inventors: 李向锋; 张玉清; 陈美淋
Original assignee: 深圳市思达仪表有限公司
Priority date: 2016-09-27
Filing date: 2016-09-27
Publication date: 2018-04-05

Abstract

A method and apparatus for voltage hysteresis determination and activation of a lithium-thionyl chloride battery. The method comprises: determining whether voltage hysteresis occurs in a lithium-thionyl chloride battery; and if voltage hysteresis occurs and a time period for two adjacent voltage hysteresis activations exceeds a certain interval, using a small current discharge circuit to perform small current discharge activation on the lithium-thionyl chloride battery. Since the battery is activated only when voltage hysteresis occurs and a time period for two activations exceeds a certain time interval, unnecessary battery consumption is effectively prevented; in addition, due to the use of a small current to activate the battery, a large current activation is effectively prevented from damaging the battery, and the service life of the battery is guaranteed.

Description

Voltage hysteresis determination and activation method and device for lithium thionyl chloride battery

[0001] Technical Field

[0002] The present invention relates to the field of voltage determination and activation of lithium batteries, and more particularly to a method and apparatus for determining and activating voltage hysteresis of a lithium thionyl chloride battery.

[0003] 3⁄4 body

[0004] Voltage hysteresis is a major characteristic of lithium thionyl chloride batteries, and it is also the basis of the existence of such batteries. The principle is as follows: The thionyl chloride electrolyte constituting the battery is a strong oxidizing chemical, which rises with it. The electrolyte and the positive electrode active material of the battery. After the thionyl chloride is in contact with the lithium metal as the negative electrode active material of the battery, a dense passivation film is formed on the surface of the metal lithium. This passivation film is an ion. The conductor, lithium ions can migrate in the passivation film, and the rate at which lithium ions migrate in the passivation film is small, thus blocking the battery from reacting. When the current flowing through the battery is not more than 1μΑ/αη2 (metal lithium surface area), the migration rate of lithium ions in the passivation film can meet the requirements; when the current is large, the limitation of the migration rate of lithium ions in the passivation film is severe. The effect is that a large voltage drop occurs across the passivation film. The specific performance of the passivation film is the battery load voltage. As the current continues to flow, the passivation film gradually ruptures, and the voltage drop across the gradual drop, the load voltage of the battery. It gradually rises to normal. The gradual rupture process of the passivation film is the elimination process of the battery voltage lag. When the battery is in a small current discharge or storage condition, the passivation film of the battery will gradually thicken, and the voltage hysteresis of the battery will be aggravated. Seriously, the voltage will drop to 2 V or even more. Affect the user's use. If no measures are taken on the circuit, the instrument will not work properly due to the transient voltage being too high. At present, the method for eliminating the voltage hysteresis of lithium thionyl chloride battery is generally to use a large current between short turns to discharge the lithium thionyl chloride battery. The advantage of this scheme is that it is not necessary to judge whether the battery has voltage lag or not. Activation; the downside is that frequent high current discharge activation accelerates battery consumption and affects battery life.

SUMMARY OF THE INVENTION

[0006] In order to solve the above technical problem, the present invention proposes a voltage hysteresis of a lithium thionyl chloride battery in which a lithium thionyl chloride battery is judged to have a voltage hysteresis, and a lithium thionyl chloride battery is activated according to the judgment result. Decision and activation methods and devices. [0007] A voltage hysteresis determination and activation method for a lithium thionyl chloride battery, comprising the steps of: Sl, determining whether there is a last activation time, and if so, performing step S2; if not, performing step S3; S2, determining the last time Whether the inter-turn interval between the activation time and the current time reaches the preset collection time, if yes, go to step S3, if not, continue with this step; S3, collect the current battery voltage, and then determine the system operation time, and from the experience Reading the empirical value of the voltage corresponding to the running time of the system, and determining whether the current battery voltage is less than the voltage empirical value, and if yes, performing step S4, if not, returning to step S1, wherein the experience table records Correspondence between the system running time and the battery experience value; S4. Using a small current discharge circuit to activate the activation operation in the battery.

Another technical solution provided by the present invention is:

[0009] A voltage hysteresis determination and activation device for a lithium thionyl chloride battery, comprising a control device and a small current discharge circuit, the control device being electrically connected to the small current discharge circuit, the small current discharge circuit and the lithium thionyl chloride battery The control device includes a first determining module, a second determining module, a voltage collecting module, a voltage experience value acquiring module, a third determining module, and an activation module, where the first determining module is configured to determine whether there is a last activation. The second determining module is configured to determine whether the inter-turn interval between the last active time and the current time reaches a preset collection time when there is a last activation time; the voltage collecting module is used for The second judgment module determines that the result is 吋, and collects the current battery voltage; the voltage empirical value acquisition module is configured to determine the system operation time after the voltage collection module collects the battery voltage, and read from the experience table. The system operates a corresponding voltage empirical value between the turns, wherein the experience table records the system running time and electricity Corresponding relationship of the experience value; the third determining module is configured to determine whether the current battery voltage is less than the voltage empirical value; the activation module is configured to use the small current discharging circuit to the battery when the third determining module determines that the result is 吋Perform the activation operation in the preset activation time.

[0010] The beneficial effects of the present invention are as follows: The present invention collects the voltage of the lithium thionyl chloride battery, and compares the collected battery voltage with the lithium thionyl chloride battery, and the voltage of the current month in the corresponding voltage value empirical table. The values are compared to determine whether the battery has a voltage hysteresis, and the battery is activated only when there is a voltage hysteresis, thereby effectively preventing unnecessary consumption; further, the present invention determines the current voltage acquisition and the previous activation period. Whether the interval between the two turns is exceeded, and the lithium thionyl chloride battery is activated only when the two activated turns exceed a certain inter-turn interval. Further, the present invention uses a small electric power. The flow activates the lithium thionyl chloride battery, effectively preventing the damage of the battery caused by the large current activation, and ensuring the service life of the battery.

[0011] National Outline

1 is a block diagram showing the structure of a voltage hysteresis determination and activation device for a lithium thionyl chloride battery according to an embodiment of the present invention;

2 is an empirical table of the use of the lithium-thionyl chloride battery in the embodiment of the present invention and the corresponding voltage value.

3 is a flow chart showing a method for determining and activating a voltage hysteresis of a lithium thionyl chloride battery according to an embodiment of the present invention;

4 is a circuit diagram of a small current discharge circuit according to an embodiment of the present invention.

[0016] Main label description

[0017] Control device-1; first determination module-10; second determination module-20; voltage acquisition module -30; voltage empirical value acquisition module-40; third determination module-50; activation module -60; Discharge circuit -70; lithium thionyl chloride battery -80.

[0018] t m^

[0019] In order to explain in detail the technical contents, structural features, objects and effects of the present invention, the embodiments will be described in detail below with reference to the accompanying drawings.

[0020] As shown in FIG. 2, in the embodiment of the present invention, a lithium thionyl chloride battery is used in the enthalpy and the corresponding voltage value empirical table, and the lithium thionyl chloride battery can be inquired through the use of the enthalpy. 80 is the voltage value under normal conditions (without voltage hysteresis), so it can be judged whether there is voltage hysteresis in the battery according to the use of the diurnal and corresponding voltage value empirical table and the voltage of the lithium thionyl chloride battery 80.

[0021] Please refer to FIG. 1 , which is a structural block diagram of a voltage hysteresis determination and activation device for a lithium thionyl chloride battery according to an embodiment of the present invention. The voltage hysteresis determination and activation device of the lithium thionyl chloride battery includes a control device 1 and a small current discharge circuit 70, the control device 1 is electrically connected to the small current discharge circuit 70, and the small current discharge circuit 70 and lithium thionyl chloride The battery device 80 is electrically connected. The control device 1 includes a first determining module 10, a second determining module 20, a voltage collecting module 30, a voltage experience value acquiring module 40, a third determining module 50, and an activating module 60.

[0022] The first determining module 10 is configured to determine whether there is a last activation time; [0023] The second judging module 20 is configured to determine whether the inter-time interval between the last activation time and the current time reaches the preset collection time when there is a last activation time;

[0024] The voltage collecting module 30 is configured to: when the second determining module determines that the result is 吋, collect the current battery voltage;

[0025] The voltage empirical value acquisition module 40 is configured to determine a system operation time after the voltage collection module collects the battery voltage, and read an empirical value of the voltage corresponding to the operation time of the system from the experience table, Wherein, the experience table describes the correspondence between the system operation time and the battery experience value;

The third determining module 50 is configured to determine whether the current battery voltage is less than a voltage experience value;

[0027] The activation module 60 is configured to use a small current discharge circuit to perform an activation operation in the preset activation period of the battery when the determination result of the third determination module is 吋.

[0028] As shown in FIG. 4, which is a schematic diagram of the small current discharge circuit, the small current discharge circuit includes a resistor R28, a PNP type transistor Q13, and a capacitor C9. The base of the transistor Q13 is electrically connected to the resistor R28, and is emitted. The pole is connected to the +5V power supply, the collector is connected to the positive pole of the capacitor C9, the other end of the resistor R28 is connected to the control device, and the cathode of the capacitor C9 is connected to the ground. The resistor R28 is a resistance of about 1000 ohms. When it is determined that there is a voltage hysteresis in the lithium thionyl chloride battery, the input terminal of the resistor R28 is at a level of 氐, thereby activating the discharge circuit.

[0029] Since the formation of the passivation film inside the lithium thionyl chloride battery requires a certain period, the thickness of the passivation film formed in the day of 7 days does not cause significant voltage hysteresis, so within one week under normal conditions There is no need to activate the lithium thionyl chloride battery, that is, the minimum period of activation of two adjacent voltage hysteresis is 7 days. Therefore, in the embodiment, the preset collection time is preferably 7 days, that is, when the interval between the last activation to the current time reaches 7 days, the judgment result of the second judgment module is In other embodiments, the preset collection time is 6 to 8 days.

[0030] The voltage of the lithium thionyl chloride battery can be set to be the frequency of the lithium thionyl chloride battery when the lithium subsulfide battery is exposed to a small current for a long period of time or storage. Otaru collects once.

[0031] The present invention compares the voltage of the lithium thionyl chloride battery, compares the collected battery voltage with the lithium thionyl chloride battery, and compares the voltage value of the current month in the corresponding voltage value empirical table to determine whether the battery is There is a voltage hysteresis, and the battery is activated only when there is a voltage hysteresis, thereby effectively preventing Unnecessary consumption; further, the present invention determines whether the inter-turn interval between the last activation time and the current time reaches the preset acquisition time, only when the two-time interval between the two activations reaches the preset collection time. The lithium thionyl chloride battery is activated. Further, the invention uses a small current discharge circuit to activate a small current of the lithium thionyl chloride battery, effectively preventing the damage of the battery by the large current activation, and ensuring the service life of the battery.

[0032] In an actual practical process, when the voltage difference between the current month battery voltage value of the lithium sulfite battery and the collected lithium thionyl chloride battery voltage is greater, the lithium thionyl chloride battery is blunt inside. The thicker the film is, the more the battery needs to be activated with a slightly larger current in order to activate the battery with as short a drain as possible while protecting the battery. Therefore, in this embodiment, the activation module 60 includes a voltage difference calculation unit;

[0033] the voltage difference calculation unit is configured to calculate a difference between the voltage experience value and the current battery voltage;

[0034] The activation module 60 is configured to read an activation current corresponding to the difference from an activation table, where the activation table is used to record a correspondence between the difference and the activation current;

[0035] The activation module 60 is configured to apply the activation current to the battery within the preset activation period using a small current discharge circuit.

[0036] The activation current ranges from 2 mA to 4 mA, which is proportional to the voltage difference, as shown in Table 1, which is an activation table of the activation current corresponding to the difference in the embodiment;

[0037] Table 1

1 with \ 1. : 2 12' s !

1 3⁄4 涵

[0038] wherein the activation module 60 controls the small current discharge circuit to generate different activation currents by generating pulse signals of different duty ratios.

[0039] Because the contact area of the thionyl chloride in the lithium thionyl chloride battery of different capacity and the negative electrode active material of the battery is different, the area of the passivation film formed is different, and the area of the passivation film is larger as the battery capacity is larger. The larger it is, the longer it takes to activate the daytime, and the battery activation can cause damage to the lithium thionyl chloride battery. Therefore, the activation module 60 in the embodiment further includes a capacity detecting unit;

[0040] The capacity detecting unit is configured to detect a capacity of the battery, and read a preset activation time corresponding to the battery capacity from an active time table. [0041] As shown in Table 2, for the activation time table corresponding to the battery capacity and the activation time, the preset activation time is 8 to 12 minutes, which is proportional to the battery capacity.

[0042] Table 2

[0043] As the battery activation progresses, the thickness of the passivation film inside the lithium thionyl chloride battery gradually becomes smaller, so in order to prevent damage to the battery caused by the battery activation terminal activation current, the activation module 60 further includes a current control module. ;

[0044] The current control module is configured to control the magnitude of the activation current of the small current discharge circuit to be inversely proportional to the daytime of the activation, that is, the magnitude of the activation current is gradually decreased as the activation progresses.

[0045] As shown in FIG. 3, an embodiment of the present invention further provides a voltage hysteresis determination and activation method for a lithium thionyl chloride battery, including the steps of:

[0046] determining whether there is a last activation time, and if so, performing step S2, if not, executing step S3;

[0047] determining whether the inter-time interval between the last activation to the current time reaches the preset collection time, and if yes, executing step S3, if not, continuing the step;

[0048] collecting the current battery voltage, then determining the system operation time, and reading the empirical value of the voltage corresponding to the running time of the system from the experience table, and determining whether the current battery voltage is less than the voltage empirical value, and if so, performing steps S4, if no, returning to step S1, wherein the experience table records the correspondence between the system operation time and the battery experience value;

[0049] The battery is subjected to an activation operation within a preset activation period using a small current discharge circuit.

[0050] wherein, the step S4 specifically includes the following steps:

[0051] calculating a difference between the voltage empirical value and the current battery voltage;

[0052] reading an activation current corresponding to the difference from an activation table, wherein the activation table is used to record a correspondence between a difference value and an activation current;

[0053] applying the activation power to the battery within the preset activation period using a small current discharge circuit

[0054] wherein the activation current ranges from 2 mA to 4 mA.

[0055] wherein, before the step S43, the method further comprises the steps of: [0056] detecting the capacity of the battery, and reading a preset activation time corresponding to the battery capacity from an active time table

[0057] wherein the magnitude of the activation current in step S5 is inversely proportional to the time of the current activation.

[0058] In summary, the present invention collects the voltage of the lithium thionyl chloride battery, and compares the collected battery voltage with the lithium thionyl chloride battery and the voltage value of the current month in the corresponding voltage value empirical table. In comparison, it is judged whether there is a voltage hysteresis in the battery, and the battery is activated only when there is a voltage hysteresis, thereby effectively preventing unnecessary consumption; further, the present invention determines whether the current voltage acquisition and the previous activation time exceed The lithium thionyl chloride battery is activated only when the two activated turns exceed a certain inter-turn interval. Further, the present invention uses a small current to activate the lithium thionyl chloride battery, effectively preventing large The current activates the damage to the battery and ensures the battery life.

[0059] Further, the present invention calculates a voltage difference between the current month battery voltage value of the lithium sulfite battery and the collected lithium thionyl chloride battery voltage, and uses different currents for the lithium thionyl chloride battery according to the voltage difference. The value is activated to effectively increase the efficiency of the activation during the protection of the battery.

Further, the present invention detects the capacity of the lithium thionyl chloride battery, and activates the lithium thionyl chloride battery according to the difference in capacity, thereby protecting the battery from being ensured under the premise that the battery is fully activated. Excessive activation and damage.

[0061] Further, the activation current of the present invention gradually decreases as the activation progresses, thereby avoiding damage to the battery caused by a large activation current of the battery at the end of the activation period while ensuring the activation of the inter-turn efficiency.

The above is only the embodiment of the present invention, and thus does not limit the scope of the invention, and the equivalent structure or equivalent process transformation made by using the specification and the drawings of the present invention, or directly or indirectly applied to other The related technical fields are all included in the scope of patent protection of the present invention.

technical problem

Problem solution

Advantageous effects of the invention

Claims

Claim

[Claim 1] A method for determining and activating a voltage hysteresis of a lithium thionyl chloride battery, comprising:

51, determining whether there is a last activation time, and if so, performing step S2, if not, executing step S3;

52. Determine whether the inter-time interval between the last activation time and the current time reaches the preset collection time. If yes, go to step S3, if no, continue with this step;

53. Collect the current battery voltage, then determine the system operation time, and read the voltage empirical value corresponding to the running time of the system from the experience table, and determine whether the current battery voltage is less than the voltage experience value, and if yes, perform step S4. If no, return to step S1, where the experience table records the correspondence between the system operation time and the battery experience value;

54. Use a small current discharge circuit to perform a preset activation activation operation in the battery.

[Claim 2] The voltage hysteresis determination and activation method of a lithium thionyl chloride battery according to claim 1, wherein the step S4 specifically includes the following steps:

541. Calculate a difference between the empirical value of the voltage and the current battery voltage;

542. Read an activation current corresponding to the difference from an activation table, where the activation table is used to record a correspondence between the difference and the activation current;

543. Applying the activation current to the battery in the preset activation period using a small current discharge circuit.

The method according to claim 1, wherein the activation current range is 2 mA to 4 mA.

[Claim 4] The voltage hysteresis determination and activation method of the lithium thionyl chloride battery according to claim 2, wherein the step S43 further comprises the steps of:

The capacity of the battery is detected, and a preset activation time corresponding to the battery capacity is read from an active time table.

[Claim 5] The voltage hysteresis determination and activation method of the lithium thionyl chloride battery according to claim 2, wherein the magnitude of the activation current in step S5 is inversely proportional to the daytime of the activation. [Claim 6] A voltage hysteresis determining and activating device for a lithium thionyl chloride battery, comprising: a control device and a small current discharge circuit, wherein the control device is electrically connected to the small current discharge circuit, and the small current discharge circuit is The lithium thionyl chloride battery is electrically connected, and the control device comprises a first determining module, a second determining module, a voltage collecting module, a voltage empirical value acquiring module, a third determining module and an activation module,

The first determining module is configured to determine whether there is a last activation time;

The second determining module is configured to determine whether the inter-turn interval between the last active time and the current time reaches a preset collection time when there is a last activation time; the voltage collecting module is configured to be used as the first The second judgment module judges that the result is yes, and collects the current battery voltage;

The voltage empirical value acquisition module is configured to determine a system operation time after the voltage collection module collects a battery voltage, and read a voltage empirical value corresponding to the system operation time from the experience table, where The correspondence between the system operation time and the battery experience value is recorded in the experience table;

The third determining module is configured to determine whether the current battery voltage is less than a voltage experience value; the activation module is configured to: when the third determining module determines that the result is 吋, use a small current discharging circuit to preset the battery to activate the daytime Activation action within.

[Claim 7] The voltage hysteresis determination and activation device of the lithium thionyl chloride battery according to claim 6, wherein the activation module includes a voltage difference calculation unit,

The voltage difference calculation unit is configured to calculate a difference between the voltage experience value and the current battery voltage; the activation module is configured to read an activation current corresponding to the difference value from an activation table, where the activation table Used to record the correspondence between the difference and the activation current;

The activation module is configured to apply the activation current to the battery within the predetermined activation period using a small current discharge circuit.

The device according to claim 7, wherein the activation current range is 2 mA to 4 mA.

[Claim 9] The voltage hysteresis determination and activation device of the lithium thionyl chloride battery according to claim 7, wherein the activation module further includes a capacity detecting unit, The capacity detecting unit is configured to detect a capacity of the battery, and read a preset activation time corresponding to the battery capacity from an active time table.

[Claim 10] The voltage hysteresis determination and activation device of the lithium thionyl chloride battery according to claim 7, wherein the activation module further includes a current control module, and the current control module is configured to control a small current discharge The magnitude of the activation current of the circuit is inversely proportional to the time of the activation.