Battery cell control circuit and battery

Abstract

The embodiment of the utility model discloses a cell control circuit and a battery, and relates to the technical field of battery power supply, the cell control circuit comprises a first input module, a first voltage reduction module, a first charging detection module and a first energy storage module; the first energy storage module is a lithium iron phosphate cell; the first charging detection module is connected with the first input module and the first voltage reduction module. The first voltage reduction module is connected with the first energy storage module. The effects that the energy storage module continuously and stably outputs rated voltage and the static power consumption is reduced are achieved.

Description

Technical Field

[0001] This utility model relates to the field of battery power supply technology, and in particular to a cell control circuit and a battery. Background Technology

[0002] Most remote controls, toys, electronic scales, and mice on the market currently use microcontrollers for control, with a common operating voltage range of 2.4V to 3.5V and an upper limit of 3.6V. They are typically powered by two dry-cell batteries connected in series. The factory voltage of a single dry-cell battery is 1.65V to 1.7V, and the maximum voltage of two dry-cell batteries is 3.4V, which is within the safe voltage range of the microcontroller. However, since the voltage of ordinary lithium-ion batteries is 3.0V to 4.2V, with a maximum voltage of 4.2V, exceeding the microcontroller's safe voltage of 3.6V, direct use would damage the microcontroller. Currently, the market uses DC-DC step-down chips to reduce the voltage of the 4.2V lithium battery to 1.5V, allowing rechargeable lithium-ion batteries to replace the dry-cell batteries.

[0003] Using a DC-DC step-down chip to convert traditional lithium-ion batteries to 1.5V has the following drawbacks for low-power applications using AA, AAA, AAA, and AAA batteries. These drawbacks are mainly as follows:

[0004] First, there are DC-DC step-down chips. DC-DC step-down chips use switching power supply technology to control the output voltage by adjusting the switching time ratio (duty cycle) or frequency based on the input voltage. This operating mode results in relatively high power consumption, typically around 6uA.

[0005] Secondly, a DC-DC step-down chip is used to reduce the voltage. Its application is in applications with low current conversion efficiency. Its own conversion efficiency is 90%, and after the consumption of external electronic components such as resistors, the overall efficiency is about 85%.

[0006] Third, using a DC-DC step-down chip requires more external components, such as inductors and capacitors, making the design relatively complex.

[0007] Fourth, the cost of using DC-DC step-down chips is high. The cost of a battery using a DC-DC step-down chip is higher than that of dry cell batteries currently on the market, and also higher than the price of lithium batteries themselves. Utility Model Content

[0008] The technical problem to be solved by this utility model embodiment is that the battery has high losses when using the DC-DC step-down working mode.

[0009] To address the aforementioned problems, this utility model discloses a battery cell control circuit, which achieves the effect of reducing static power consumption.

[0010] The utility model provides a kind of battery control circuit, which comprises a first input module, a first voltage reduction module, a first charge detection module and a first energy storage module.

[0011] The utility model also provides a battery control circuit, which comprises a second input module, a second voltage reduction module and a second charge detection module.

[0012] Further technical solutions of the utility model include a second energy storage module, which is connected to the second charge detection module and the first input port.

[0013] Further technical solutions of the utility model include a second input port, a second output port and a charge detection unit in the second charge detection module.

[0014] Further technical solutions of the utility model include a light-emitting element in the second charge detection module.

[0015] Further technical solutions of the utility model include a charge detection unit with model numbers 4054, 4055, 4056 and 4067.

[0016] Further technical solutions of the utility model include a type-c interface in the second input module.

[0017] Further technical solutions of the utility model include an LDO voltage reduction unit with model numbers WR0331, TX6216 and TX72XXM.

[0018] Further technical solutions of the utility model include a first output port with an output voltage range of 3.0V-3.3V.

[0019] Further technical solutions of the utility model include a conductive element connected to the first output port.

[0020] The utility model also provides a battery, which includes the battery control circuit of any one of the embodiments of the second aspect.

[0021] Compared with the prior art, the technical effects that the embodiment of the utility model can achieve include:

[0022] The circuit can effectively protect the lithium iron phosphate battery when a special lithium iron phosphate battery charging chip is not used, the voltage does not exceed 3.7V (the cut-off voltage of the lithium iron phosphate battery is 3.65V, and the battery is overcharged by using the conventional 4.2V charging management chip to charge the battery, which destroys the electrochemical structure inside the battery and causes irreversible damage to the battery), and the output voltage is 2.0V-3.50V after the load is connected, so that the output working voltage can be effectively kept within 3.60V, which does not exceed the upper limit voltage of the single-chip microcomputer, thereby the circuit can be well used to provide power for these products, the circuit can output a large current of more than 500mA because no voltage reduction chip is used at the output end and the battery directly supplies power, and the conversion efficiency can be more than 98%.

[0023] When the battery with the highest voltage of 4.2V is used, the LDO is used for voltage reduction at the output end, the working principle of the LDO is to consume the excess energy in the form of resistance, which can be understood as a sliding resistance, so that the static power consumption of the output end can be controlled at about 2uA (the traditional DC-DC voltage reduction discharging idle power consumption is 6uA), which can effectively reduce the static power consumption of the circuit and improve the stability of the output voltage.

[0024] The static power consumption of the control circuit is small, and the control circuit has the effect of high conversion efficiency when used in low-voltage, small-current and low-power electronic products. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the drawings needed in the embodiment description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0026] Figure 1 A battery cell control circuit structure block diagram provided for the embodiment 1 of the utility model;

[0027] Figure 2 A circuit diagram of the first voltage reduction module provided for the embodiment 1 of the utility model;

[0028] Figure 3 A battery cell control circuit structure block diagram provided for the embodiment 2 of the utility model;

[0029] Figure 4 A circuit diagram of the second input module provided for the embodiment 2 of the utility model;

[0030] Figure 5 The circuit diagram of the second voltage reduction module provided for the embodiment 2 of the utility model;

[0031] Figure 6 The circuit diagram of the second charging detection module provided for the embodiment 2 of the utility model;

[0032] Figure 7 The conductive part structure schematic view provided for the embodiment 2 of the utility model.

[0033] Reference signs

[0034] The first input module 1, the first charging detection module 2, the first energy storage module 3, the second voltage reduction module 5, the LDO voltage reduction unit 51, the first input port 52, the first output port 53, the second energy storage module 7, the second input port 61, the second output port 62, the charging detection unit 63, the light emitting part 64, the conductive part 8, the first voltage reduction module 9. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model, and similar components are denoted by similar reference numerals in the drawings. Obviously, the embodiments to be described below are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0036] It should be understood that when used in the specification and the appended claims, the terms "comprise" and "include" indicate the presence of described features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or a collection thereof.

[0037] It should also be understood that the terms used in the specification of the embodiments of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the utility model. As used in the specification of the embodiments of the utility model and the appended claims, unless otherwise clearly indicated by the context, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0038] Embodiment 1

[0039] Referring to Figures 1-2The utility model embodiment provides a kind of electric core control circuit.The electric core control circuit includes first input module 1, first charging detection module 2, first voltage reduction module 9 and first energy storage module 3;The first energy storage module 3 is lithium iron phosphate battery;The first charging detection module 2 is connected with the first input module 1 and the first voltage reduction module 9 respectively;The first voltage reduction module 9 is connected with the first energy storage module 3.

[0040] In the embodiment, first input module 1 includes TypeC female seat, power VCC=5V.First input module 1's VCC interface is responsible for being electrically connected with the VCC interface of first charging detection module 2, first input module 1's VCC interface is responsible for being electrically connected with the VCC interface of first charging detection module 2 after being connected with light emitting diode, the BAT interface of first charging detection module 2 is electrically connected the BAT interface of first voltage reduction module 9, the BAT interface of first voltage reduction module 9 is electrically connected with the anode of electric core, and Vout (B+) is the output interface of entire circuit, first voltage reduction module 9 includes diode D1, first voltage reduction module 9 voltage drop 0.6V, supports maximum current 0.35A, realizes that the charging cutoff voltage of electric core p1 is 3.65V, wherein, B+ is the anode of Vout, in an embodiment, electric core p1 is lithium iron phosphate battery, and the charging voltage of electric core p1 is realized not more than 3.65V by first voltage reduction module 9.Lithium iron phosphate cutoff voltage is 3.65V, when charger is pulled out, its voltage will drop to below 3.60V after 5min, therefore, the output voltage of his after connecting load is 2.0V~3.5V, and the conversion efficiency of battery capacity is close to 100%, to realize the effect of reducing the static power consumption of battery.Because the output end of the circuit does not use LDO to reduce voltage, the static current of the circuit can be controlled at 1uA and can discharge more than 500mA of large current, and can be used in the use scene of electric toy requiring large current.

[0041] In an embodiment, the output port of the first energy storage module 3 can also be connected with a voltage reduction unit, and the output voltage of the first energy storage module 3 is reduced by the voltage reduction unit to protect the electronic product. The first charging detection module 2 can also be connected with a light emitting piece, and the light emitting piece is used to display the charging state of the first energy storage module 3.

[0042] For example: when using a battery with a maximum voltage of 3.7V, the output voltage is reduced to 3.0V by using LDO, and the capacity of 5% of this type of battery is distributed above 3.3V, and the loss value of this part is 5%*(0.1 / 3.6)=0.139%, that is, the voltage is reduced by using LDO second voltage reduction module 5, and the conversion efficiency of the chip can reach at least 98% or more.

[0043] Embodiment 2

[0044] Referring to Figures 3-7The utility model embodiment provides a kind of battery control circuit.The battery control circuit includes second input module 4, second step-down module 5 and second charging detection module 6;The second step-down module 5 includes LDO step-down unit 51, first input 52 and first output 53, and the LDO step-down unit 51 is connected with the first input 52 and the first output 53 respectively;Second charging detection module 6 is connected with the second input module 4 and the first input 52 respectively.The specific introduction of each component is as follows:

[0045] In the embodiment, the second input module 4 includes a TypeC female socket, and the power supply VCC=5V. The VCC interface of the second input module 4 is responsible for electrical connection with the VCC interface of the second charging detection module 6, and the VCC interface of the second input module 4 is responsible for electrical connection with the light-emitting diode after the light-emitting diode is connected. The BAT interface of the second charging detection module 6 is electrically connected to the positive electrode of the battery core, the positive electrode of the battery core is electrically connected to the BAT interface of the second voltage reduction module 5, VDD is the output interface of the entire circuit, and is used to reduce the voltage of the battery core to a specified value, such as reducing the 4.2V battery core to 3.3V and 3.0V and outputting. The lower the voltage output by the LDO voltage reduction, the lower the conversion efficiency of the chip. The voltage reduction principle of the LDO voltage reduction unit 51 is to consume the electrical energy higher than 3.3V through a resistor during work. The LDO second voltage reduction module 5 is used to reduce the voltage of the battery core to 3.3V. Since the maximum voltage of a single lithium battery is 4.2V or 3.7V, the battery voltage will drop by about 0.3V after the battery is connected to the load (the drop value is different according to the discharge current, the greater the discharge current, the more the voltage drops). Taking a 4.2V battery as an example, 60% of the capacity of this type of battery is distributed above 3.6V. The static power consumption of the LDO used in this embodiment is 3uA (the static power consumption of the TX72XXM LDO is 2uA). When the voltage is higher than the average value, part of the energy will be converted into heat energy and consumed. Therefore, when the voltage is higher than 3.6V, the loss value of this part is estimated to be 70%*(0.4 / 4)=7%. Understandably, the conversion efficiency of the LDO second voltage reduction module 5 can reach at least 93% or more. Therefore, in the low-voltage and small-current scenario, the battery reduced by the LDO second voltage reduction module 5 has smaller static power consumption and higher conversion efficiency than the battery reduced by the traditional DC voltage reduction chip. As the discharge rate of the battery core increases, the loss value will gradually decrease, and the conversion efficiency will gradually increase. In addition, the peripheral circuit of the DC-DC voltage reduction chip is more complex than that of the LDO, so the conversion efficiency of the peripheral circuit is low. The second charging detection module 6 is electrically connected to the battery and charges the battery. Therefore, the battery control circuit using the voltage reduction module 5 to reduce the voltage of the battery has high conversion efficiency in low-voltage, small-current and low-power electronic products.

[0046] Continuing to refer to Figures 1-6 In the embodiment, a second energy storage module 7 is further included, which is connected with the second charging detection module 6 and the first input port 52 respectively.

[0047] Specifically, the second energy storage module 7 includes a battery cell, such as a lithium manganate battery, a ternary lithium battery, a lithium cobaltate battery, or a sodium ion battery. The second energy storage module 7 is connected to the second charging detection module 6 at the input end, and connected to the first input port 52 of the second voltage reduction module 5 at the output end. In an embodiment, the second charging detection module 6 is connected in parallel to the second energy storage module 7, and the second energy storage module 7 can be charged through the second charging detection module 6. The circuit can charge a 0V battery, which can effectively solve the problem of battery self-consumption when the battery is not used for a long time, and the battery power is consumed. Then, the ordinary charging circuit cannot charge the battery with zero voltage.

[0048] Further, the second charging detection module 6 includes a second input port 61, a second output port 62, and a charging detection unit 63. The charging detection unit 63 is connected to the second input port 61 and the second output port 62, respectively. The second input module 4 is connected to the second input port 61, and the second output port 62 is connected to the second energy storage module 7.

[0049] In addition, the second charging detection module 6 further includes a light-emitting element 64 connected to the second input port 61 and the charging detection unit 63.

[0050] Specifically, the second input port 61 of the second charging detection module 6 is electrically connected to the second input module 4. The light-emitting element 64 is installed on the line between the second input port 61 and the charging detection unit 63. The second output port 62 is connected to the second energy storage module 7. In an embodiment, when the light-emitting element 64 is preset to charge, the light-emitting element 64 displays a green light that is always on. When it is fully charged, the light-emitting element 64 turns from bright to off.

[0051] Further, the model of the charging detection unit 63 includes 4054, 4055, 4056, and 4067.

[0052] In an embodiment, the model of the charging detection unit 63 is 4054, such as HX4054A, which has the functions of detecting battery voltage, linear charging, and preventing overcharging by upper cut-off voltage.

[0053] Further, the third voltage reduction module is connected to the second input module and the second energy storage module, respectively.

[0054] Specifically, the third voltage reduction module is used to reduce the input voltage of the second energy storage module 7 to avoid overcharging of the second energy storage module 7 and protect the second energy storage module 7.

[0055] Further, the model of the LDO voltage reduction unit 51 includes WR0331, TX6216, and TX72XXM.

[0056] In an embodiment, the LDO voltage reduction unit 51 is of model WR0331, which detects the voltage of the battery and consumes the excess voltage when the battery exceeds a certain threshold.

[0057] Further, the first energy storage unit is connected with a battery protection plate to prevent over-discharge of the battery, which is of model DW01K.

[0058] Further, the output voltage range of the first output port 53 is 3.0V-3.3V.

[0059] Further, the resistance value of the R4 resistor of the charging detection module can change the size of the charging current, I=1000 / R4, when the R4 resistor is 100K, the current is 100mA, and when the R4 resistor is 2K, the current is 500mA.

[0060] In addition, the conductive part 8 is connected with the first output port 53.

[0061] Specifically, the conductive part 8 is electrically connected with the first output port 53. Figure 5 In an embodiment, the conductive part 8 includes a placeholder cylinder, which is a battery shell structure and has conductivity. Because most of the electronic products in the market use at least one pair of dry batteries in series when designed, when the output voltage range of the first output port 53 is 3.0V-3.3V, two situations will occur: first, the voltage of the two circuits will exceed 3.5V, causing the entire electronic product to be damaged due to the excessively high voltage; second, when using one battery, the battery compartment of the traditional electronic product is designed for two batteries in series, so the circuit cannot form an effective loop when using one battery. Therefore, the conductive part 8 is installed at the first output port 53 to form a complete loop in the electronic product.

[0062] The utility model further provides a battery, the battery includes the battery control circuit which any one embodiment described above.

[0063] Specifically, the battery includes a single lithium ion battery.

[0064] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0065] In addition, the terms "first", "second", "third", etc. are used herein only to describe various circumstances, and should not be construed as indicating or implying relative importance or an indicated number of the technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0066] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be connected, or it can be detachable, or it can be integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0067] In the present application, unless otherwise specifically defined and limited, the first feature "on" or "under" the second feature can include the direct contact of the first and second features, or the indirect contact of the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0068] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application.

[0069] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, these modifications and variations of the present application are within the scope of the claims of the present application and its equivalent technologies, and the present application also intends to include these modifications and variations.

[0070] The above describes the specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A cell control circuit, characterized in that, It includes a first input module, a first buck module, a first charging detection module, and a first energy storage module; The first energy storage module is a lithium iron phosphate battery cell; The first charging detection module is connected to both the first input module and the first step-down module. The first step-down module is connected to the first energy storage module.

2. A cell control circuit, characterized in that, It includes a second input module, a second buck module, a second charging detection module, and a second energy storage module; The second step-down module includes an LDO step-down unit, a first input port, and a first output port. The LDO step-down unit is connected to the first input port and the first output port, respectively. The second energy storage module is connected to both the second charging detection module and the first input port. The second charging detection module is connected to both the second input module and the first input port.

3. The cell control circuit according to claim 2, characterized in that, The second charging detection module includes a second input port, a second output port, and a charging detection unit. The charging detection unit is connected to the second input port and the second output port, respectively. The second input module is connected to the second input port, and the second output port is connected to the second energy storage module.

4. The cell control circuit according to claim 3, characterized in that, The second charging detection module also includes a light-emitting element, which is connected to the second input port and the charging detection unit respectively.

5. The cell control circuit according to claim 4, characterized in that, The models of the charging detection units include 4054, 4055, 4056, and 4067.

6. The cell control circuit according to claim 2, characterized in that, It also includes a third step-down module, which is connected to the second input module and the second energy storage module respectively.

7. The cell control circuit according to claim 2, characterized in that, The LDO step-down units include models WR0331, TX6216, and TX72XXM.

8. The cell control circuit according to claim 2, characterized in that, The output voltage range of the first output port is 3.0V to 3.3V.

9. The cell control circuit according to claim 8, characterized in that, It also includes a conductive component, which is connected to the first output port.

10. A battery, characterized in that, Including the cell control circuit as described in any one of claims 2-9.

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