Method, device and equipment for confirming overclocking fast charge boundary of battery

Abstract

The invention belongs to the technical field of batteries, and particularly relates to a method, a device and equipment for confirming an overclocking fast charge boundary of a battery. The method comprises the following steps: communicating charging equipment with a battery, arranging a reference electrode on the battery, and monitoring a negative reference potential on the reference electrode in real time; and charging the battery at the maximum charging rate, and charging the battery by adopting different charging modes according to the change condition of the negative parameter potential. The method can improve the precision of the fast charge boundary confirmation test, does not need to set a jump current step length, and prevents the boundary test result from being affected by standing.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and particularly relates to a method, device and equipment for confirming the boundary of overclocking fast charging of batteries. Background Art

[0002] The state of charge (SOC) of a battery at different charging rates is an important basis for formulating a fast charging system. The higher the charging rate, the faster the charging speed, but the higher the risk of lithium plating in the battery. And the confirmation of the lithium plating boundary is crucial for determining the state of charge at what charging rate.

[0003] Currently, the commonly used boundary confirmation method is to charge the battery at a constant current until the preset voltage of the full battery, or to perform stepped rate charging on the battery. However, the above lithium plating boundary confirmation method has low test accuracy, long test confirmation time, high cost investment, and needs to jump the current step during the confirmation test, and is easily affected by the electrochemical reaction generated inside the battery during the jump and static time. Summary of the Invention

[0004] An embodiment of the present invention provides a method for confirming the boundary of overclocking fast charging of a battery, which is used to solve the technical problems of low test accuracy in the prior art, the need to jump the current step during the confirmation test, being easily affected by the electrochemical reaction generated inside the battery during the jump and static time, long test confirmation time, and high cost investment.

[0005] In a first aspect, an embodiment of the present invention provides a method for confirming the boundary of overclocking fast charging of a battery, including:

[0006] Connect a charging device and a battery, set a reference electrode on the battery, and monitor the negative reference potential on the reference electrode in real time;

[0007] Charge the battery at the maximum charging rate, and charge the battery in different charging methods according to the change of the negative reference potential.

[0008] In an optional embodiment, the charging the battery in different charging methods according to the change of the negative reference potential includes:

[0009] When it is detected that the negative reference potential reaches a predetermined value, change the charging method to charge the battery until the voltages on the positive and negative electrodes of the battery reach a preset cut-off voltage.

[0010] In an optional embodiment, the when it is detected that the negative reference potential reaches a predetermined value, change the charging method to charge the battery includes:

[0011] Charge the battery in a first charging method at the maximum charging rate;

[0012] When the negative reference potential detected on the reference electrode reaches a predetermined value, the battery is charged according to a second charging method.

[0013] In an alternative embodiment, the first charging method includes any one of constant current charging or constant voltage charging;

[0014] And / or, the second charging method includes any one of constant current charging or constant voltage charging.

[0015] In an alternative embodiment, the predetermined value is 0V.

[0016] In an alternative embodiment, the method for obtaining the maximum charging rate includes:

[0017] Measure the open circuit voltage of the battery at different states of charge to determine the internal resistance of the battery;

[0018] Charge the battery with different charging currents and measure the polarization voltages corresponding to different charging currents;

[0019] According to the internal resistance, charging current and polarization voltage, establish a functional relationship model, and obtain the maximum charging rate through data fitting.

[0020] In an alternative embodiment, the functional relationship model includes a linear function relationship model or a quadratic function relationship model;

[0021] The data fitting includes according to the polarization voltage test conditions:

[0022] OCV(SOC)+I×R Ω +Vp(I)=V cutoff ;

[0023] Increase the charging current. When the equation of the polarization voltage test conditions is satisfied and the negative reference potential is greater than or equal to 0, then the charging current is the maximum charging rate.

[0024] In an alternative embodiment, the functional relationship model is Vp(I)=k(SOC)×I+b(SOC);

[0025] Wherein, I represents the charging current, Vp(I) represents the polarization voltage, V cutoff represents the charging cut-off voltage, and k(SOC) and b(SOC) respectively represent the correlation coefficients.

[0026] In a second aspect, an embodiment of the present invention provides a device for confirming the boundary of overclocking fast charging of a battery, including:

[0027] A monitoring unit is configured to connect a charging device and a battery, set a reference electrode on the battery, and monitor the negative reference potential on the reference electrode in real time;

[0028] A charging unit is configured to charge the battery at the maximum charging rate, and charge the battery using different charging methods according to the change of the negative reference potential.

[0029] In a third aspect, an embodiment of the present invention provides a processor and a memory communicatively connected to the processor;

[0030] The memory stores computer-executable instructions;

[0031] The processor executes the computer-executable instructions stored in the memory to implement the method described in any one of the embodiments of the first aspect of the present application.

[0032] Implementing the technical solutions of the present invention has at least the following beneficial effects:

[0033] An embodiment of the present invention provides a method for confirming the boundary of overclocking fast charging of a battery. By connecting a charging device and a battery, setting a reference electrode on the battery, and monitoring the negative reference potential on the reference electrode in real time; charging the battery at the maximum charging rate, and charging the battery using different charging methods according to the change of the negative reference potential. The method of the present invention can improve the accuracy of the fast charging boundary confirmation test, and at the same time, there is no need to set a jump current step size, avoiding the generation of static electricity and affecting the boundary test result.

[0034] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present invention, and are used together with the specification to explain the principles of the present invention.

[0036] Figure 1 The flowchart of the method for confirming the boundary of overclocking fast charging of the battery provided by the embodiment of the present invention is shown; Figure 1 ;

[0037] Figure 2 The flowchart of the method for confirming the boundary of overclocking fast charging of the battery provided by the embodiment of the present invention is shown; Figure 2 ;

[0038] Figure 3 The schematic structural diagram of the device for confirming the boundary of overclocking fast charging of the battery provided by the embodiment of the present invention is shown;

[0039] Figure 4The following is a schematic structural diagram of the device for confirming the boundary of overclocking fast charging of the battery provided by the embodiment of the present invention;

[0040] Figure 5 The following is a test curve graph for confirming the boundary of overclocking fast charging of the battery provided by the embodiment of the present invention.

[0041] Through the above-mentioned drawings, specific embodiments of the present invention have been shown, and more detailed descriptions will be given later. These drawings and textual descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Specific Embodiments

[0042] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments of the present invention are only used to illustrate the present invention and not to limit the scope of the present invention.

[0043] In the ranges disclosed herein, the endpoints and any values are not limited to the exact ranges or values. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range or individual point values, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein.

[0044] If there is no special indication, all embodiments and optional embodiments of the present invention can be combined with each other to form new technical solutions.

[0045] If there is no special indication, all technical features and optional technical features of the present invention can be combined with each other to form new technical solutions.

[0046] If there is no special indication, all steps of the present invention can be carried out in sequence or randomly, and preferably in sequence. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) carried out in sequence, or may include steps (b) and (a) carried out in sequence. For example, it is mentioned that the method may further include step (c), which means that step (c) can be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0047] If there is no special indication, the "including" and "comprising" mentioned in the present invention mean open-ended or may also be closed-ended. For example, the "including" and "comprising" may mean that other components not listed may also be included or comprised, or may only include or comprise the listed components.

[0048] The method for confirming the boundary of fast charging by electricity is usually to charge the battery at a constant current until the preset voltage of the full battery. However, this method has a low accuracy in boundary test confirmation. For R & D personnel, it is impossible to quickly and accurately determine a reasonable range of charging parameters, making it difficult to meet the user's demand for fast charging. Another method is to charge the battery at a stepped multiple rate. However, this method requires jumping the current step during the test. During the interval of jumping the current step, it is necessary to stand still for a period of time. During the standing still process, electrochemical reactions will occur inside the battery, which will also affect the accuracy of the confirmation test. At the same time, there are also problems such as long test confirmation time and high cost.

[0049] In view of this, the embodiments of the present invention provide a method for confirming the boundary of overclocking fast charging of a battery, which can quickly and accurately perform a fast charging boundary confirmation test, and there is no need to set a jumping current step and no need to stand still during the test, thus avoiding the influence of electrochemical reactions generated inside the battery.

[0050] Figure 1 The following is a method flow for confirming the boundary of overclocking fast charging of a battery provided by the embodiments of the present invention Figure 1 . As Figure 1 shown, the embodiments of the present application provide a method for confirming the boundary of overclocking fast charging of a battery, including:

[0051] S101. Connect the charging device and the battery, set a reference electrode on the battery, and monitor the negative reference potential on the reference electrode in real time.

[0052] The electrodes of the battery usually refer to the positive electrode, the negative electrode, and the reference electrode; the reference electrode is used as a reference to determine the absolute change of the negative electrode potential. Taking the production of a three - electrode soft - package battery as an example, a copper wire is used as the reference electrode. The corroded copper wire is pasted on the separator with tape, the separator is placed in the middle layer of the electrode plate, the end of the copper wire (immersion area) is placed in the middle area of the battery cell, and the tabs do not collide with each other. When assembling, the copper wire is led out from the top, and the preliminary production of the three - electrode battery is completed.

[0053] During the charging process, the positive and negative electrodes of the battery can be connected to the charging device, and the change of the negative reference potential on the reference electrode can be monitored in real time.

[0054] S102. Charge the battery at the maximum charging rate, and charge the battery using different charging methods according to the change of the negative reference potential.

[0055] The charging methods include constant - current charging, constant - voltage charging, trickle charging, or segmented charging, etc. One of these methods can be selected for charging according to specific requirements, or multiple charging methods can be combined for charging.

[0056] The maximum charging rate of a battery varies depending on the battery. Specifically, it will differ according to the battery's material, structure, and manufacturer.

[0057] At the start of the test, first obtain the maximum charging rate of the battery in an empty state. Charge the battery at this maximum charging rate and monitor the negative reference potential on the reference electrode of the battery. According to the negative reference potential on the reference electrode, use different charging methods to charge the battery, and then test the fast charging boundary. During this test boundary process, there is no need to set a jump current step, so there is no need to pause charging during the charging process; thus, no electrochemical reaction will occur inside the battery due to standing, which will affect the accuracy of the test boundary. For example, due to different chemical reactions generated by charging and discharging inside the battery, if charging is paused during the charging process, the electrochemical reactions inside the battery are different during this pause stage and the charging stage, which will affect the accuracy of subsequent test results.

[0058] The embodiment of the present invention provides a method for confirming the overclocking fast charging boundary of a battery. By connecting a charging device and the battery, setting a reference electrode on the battery, and real-time monitoring the negative reference potential on the reference electrode; charging the battery at the maximum charging rate, and charging the battery using different charging methods according to the change of the negative reference potential. The method of the present invention can improve the accuracy of the fast charging boundary confirmation test, and at the same time, there is no need to set a jump current step, avoiding the generation of standing and affecting the boundary test results.

[0059] Figure 2 This is the method flow for confirming the overclocking fast charging boundary of a battery provided by the embodiment of the present invention. Figure 2 As Figure 2 shown, in some embodiments of the present invention, a method for confirming the overclocking fast charging boundary of a battery is provided, including:

[0060] S201. Connect the charging device and the battery, set a reference electrode on the battery, and real-time monitor the negative reference potential on the reference electrode.

[0061] S202. Charge the battery at the maximum charging rate according to the first charging method.

[0062] The first charging method can be constant current charging, constant voltage charging, or trickle charging; by obtaining the maximum charging rate of the battery and charging at this maximum charging rate, the battery will not be damaged. Moreover, it can also clarify that the battery can accept the fastest charging speed without damaging the battery, avoiding blind experiments, enabling R & D personnel to quickly determine a reasonable charging parameter range, and conducting experiments and optimizations targeted.

[0063] S203. When the negative reference potential detected on the reference electrode reaches a predetermined value, charge the battery according to the second charging method.

[0064] In step S201, when starting to charge the battery, the negative reference potential of the reference electrode set on the battery is monitored in real time. At the same time, before the start of the test boundary, a predetermined value of the negative reference potential is set. When charging the battery by the first charging method at the maximum charging rate and it is monitored that the negative reference potential on the reference electrode reaches the predetermined value, immediately start charging by the second charging method.

[0065] Exemplarily, obtain the maximum charging rate of the battery, charge the battery in a constant current charging manner at this maximum charging rate, and monitor in real time whether the negative reference potential on the reference electrode reaches the predetermined value; when the negative reference potential reaches the predetermined value, charge in a constant voltage charging manner.

[0066] S204. Until the voltages on the positive and negative electrodes of the battery reach the preset cut-off voltage.

[0067] According to different types of batteries, the preset cut-off voltage is also different. For example, the preset cut-off voltage of lithium iron phosphate batteries is 3.6 - 3.65V, while the preset cut-off voltage of lithium cobalt oxide batteries is generally 4.2V. After the above steps S201 to S204, the corresponding boundary test curve graph is drawn, and then the fast charging boundary is obtained.

[0068] Exemplarily, as Figure 5 shown, the blue line is the negative reference voltage curve (the curve at the lower part of the curve graph, and the curve is similar to an L shape), and the yellow line is the charging rate curve. The battery is charged at the maximum rate at 0% SOC. As the charging progresses, the positive electrode voltage continuously increases, and the negative electrode voltage continuously decreases, that is, the negative reference voltage decreases. When the negative reference voltage reaches 0, the charging current is reduced (if charging continues with this current, lithium deposition will occur), and the charging current is reduced on the basis of maintaining the negative reference voltage at 0 until it is fully charged to obtain the maximum charging boundary.

[0069] In some embodiments of the present invention, the predetermined value is 0V.

[0070] For the predetermined value of the negative reference potential, in a preferred embodiment, the predetermined value of the reference potential is 0V. The fast charging ability of the battery can be maximally obtained. There is no need to manually set the current jump, no need to stand still, no need to set the jump current step size, and the current reduction is all spontaneous after the negative reference potential reaches 0V, avoiding the situation of jumping when the negative reference potential is higher than 0V (such as 5mV), and the obtained charging boundary is wider, that is, the charging rate can be larger.

[0071] Further, in some embodiments of the present invention, the method for obtaining the maximum charging rate includes:

[0072] Measure the open circuit voltage of the battery at different states of charge to determine the internal resistance R of the battery Ω 。

[0073] Charge the battery with different charging currents I, and measure the polarization voltage Vp(I) corresponding to different charging currents.

[0074] According to the internal resistance R Ω 、charging current I and polarization voltage, establish a functional relationship model, and obtain the maximum charging rate through data fitting.

[0075] In some embodiments of the present invention, the functional relationship model includes a linear function relationship model or a quadratic function relationship model;

[0076] Data fitting includes according to the polarization voltage test conditions:

[0077] OCV(SOC)+I×R Ω +Vp(I)=V cutoff ;

[0078] Increase the charging current. When the equation of the polarization voltage test condition is satisfied and the negative reference potential is greater than or equal to 0, the charging current is the maximum charging rate.

[0079] In some embodiments of the present invention, the functional relationship model is Vp(I)=k(SOC)×I+b(SOC);

[0080] Wherein, I represents the charging current, Vp(I) represents the polarization voltage, V cutoff represents the charging cut-off voltage, and k(SOC) and b(SOC) respectively represent the correlation coefficients.

[0081] Figure 3 is a schematic structural diagram of a device for confirming the boundary of overclocking fast charging of a battery provided by an embodiment of the present invention. An embodiment of the present invention provides a device 30 for confirming the boundary of overclocking fast charging of a battery, including:

[0082] A monitoring unit 301, configured to connect a charging device and a battery, set a reference electrode on the battery, and monitor the negative reference potential on the reference electrode in real time.

[0083] A charging unit 302, configured to charge the battery at the maximum charging rate, and charge the battery in different charging modes according to the change of the negative reference potential.

[0084] The charging unit 302 is further configured to change the charging mode to charge the battery until the voltages on the positive and negative electrodes of the battery reach the preset cut-off voltage when it is detected that the negative reference potential reaches a predetermined value.

[0085] The charging unit 302 is further configured to charge the battery at the maximum charging rate according to the first charging mode;

[0086] When a negative reference potential detected on the reference electrode reaches a predetermined value, the battery is charged according to a second charging method.

[0087] Figure 4 The figure is a schematic structural diagram of a device for confirming the boundary of overclocking fast charging of a battery provided by an embodiment of the present invention. An embodiment of the present invention provides a device 40 for confirming the boundary of overclocking fast charging of a battery, including: a processor 401, and a memory 402 communicatively connected to the processor 401;

[0088] The memory 402 stores computer-executable instructions;

[0089] The processor 401 executes the computer-executable instructions stored in the memory 402 to implement the method in any one of the above-mentioned embodiments of the present invention.

[0090] The parts not detailed in the present invention are well-known technologies to those skilled in the art.

[0091] The basic principles of the present invention have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, advantages, effects, etc. mentioned in the present invention are only examples and not limitations. It cannot be considered that these advantages, advantages, effects, etc. are essential for each embodiment of the present invention. In addition, the above-disclosed specific details are only for the purpose of illustration and facilitating understanding, rather than limitations. The above details do not limit the present invention to necessarily adopt the above specific details to implement.

[0092] It should be noted that the term "and / or" or " / " used herein is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. The singular forms of "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0093] In the specific embodiments and the claims, a list of items connected by terms such as "at least one of", "at least one of", "at least one kind of" or other similar terms may mean any combination of the listed items. For example, if items A and B are listed, then the phrase "at least one of A and B" means only A; only B; or A and B. In another example, if items A, B, and C are listed, then the phrase "at least one of A, B, and C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may include a single element or multiple elements. Item B may include a single element or multiple elements. Item C may include a single element or multiple elements.

[0094] When the integrated unit / module is implemented in the form of hardware, the hardware can be a digital circuit, an analog circuit, etc. The physical implementation of the hardware structure includes but is not limited to transistors, memristors, etc. Unless otherwise specified, the processor can be any suitable hardware processor, such as a CPU, GPU, FPGA, DSP, and ASIC, etc. Unless otherwise specified, the storage unit can be any suitable magnetic storage medium or magneto-optical storage medium, such as resistive random access memory (RRAM), dynamic random access memory (DRAM), static random access memory (SRAM), enhanced dynamic random access memory (EDRAM), high-bandwidth memory (HBM), hybrid memory cube (HMC), etc.

[0095] Finally, it should be noted that 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for confirming the boundary of overclocking fast charging of a battery, characterized in that Including: Connect the charging device and the battery, set a reference electrode on the battery, and monitor the negative reference potential on the reference electrode in real time; Charge the battery at the maximum charging rate, and charge the battery in different charging methods according to the change of the negative reference potential.

2. The method according to claim 1, wherein The charging the battery in different charging methods according to the change of the negative reference potential includes: Wait until it is detected that the negative reference potential reaches a predetermined value, change the charging method to charge the battery until the voltage on the positive and negative electrodes of the battery reaches a preset cut-off voltage.

3. The method according to claim 2, wherein The waiting until it is detected that the negative reference potential reaches a predetermined value and changing the charging method to charge the battery includes: Charge the battery at the maximum charging rate according to the first charging method; When it is detected that the negative reference potential reaches a predetermined value on the reference electrode, charge the battery according to the second charging method.

4. The method according to claim 3, wherein The first charging method includes any one of constant current charging or constant voltage charging; And / or, the second charging method includes any one of constant current charging or constant voltage charging.

5. The method according to claim 2, wherein [[ID=IO]]The predetermined value is 0V.

6. The method according to claim 1 or 2, characterized in that, The method for obtaining the maximum charging rate includes: Measure the open circuit voltage of the battery under different state of charge, and determine the internal resistance of the battery; Charge the battery with different charging currents, and measure the polarization voltages corresponding to different charging currents; According to the internal resistance, charging current and polarization voltage, establish a function relationship model, and obtain the maximum charging rate through data fitting.

7. The method according to claim 6, wherein The function relationship model includes a linear function relationship model or a quadratic function relationship model; The data fitting includes according to the polarization voltage test conditions: OCV(SOC)+I×R Ω +Vp(I)=V cutoff ; Increase the charging current. When the equation of the polarization voltage test conditions is satisfied and the negative reference potential is greater than or equal to 0, the charging current is the maximum charging rate.

8. The method according to claim 7, wherein The function relationship model is Vp(I)=k(SOC)×I + b(SOC); Where, I represents the charging current, Vp(I) represents the polarization voltage, and V cutoff represents the charging cut-off voltage, and k(SOC) and b(SOC) represent the correlation coefficients respectively.

9. A device for confirming the boundary of overclocking and fast charging of a battery, characterized in that, Including: A monitoring unit for connecting the charging device and the battery, setting a reference electrode on the battery, and monitoring the negative reference potential on the reference electrode in real time; A charging unit for charging the battery at the maximum charging rate and charging the battery in different charging methods according to the change of the negative reference potential.

10. A device for confirming the boundary of overclocking fast charging of a battery, characterized in that, Including: A processor and a memory communicatively connected to the processor; The memory stores computer execution instructions; The processor executes the computer execution instructions stored in the memory to implement the method according to any one of claims 1 to 8.

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