Low-voltage lithium battery monitoring circuit

Abstract

The utility model discloses a low-voltage lithium battery monitoring circuit, and the circuit comprises a lithium battery charging current detection module which is connected with a main control chip and is used for detecting the charging current of a lithium battery; the power adapter discharge current detection module is connected with the main control chip and is used for detecting the discharge current of the power adapter; the lithium battery discharge current detection module is connected with the main control chip and is used for detecting the discharge current of the lithium battery; and the charging module is respectively connected with the lithium battery and the main control chip. The state of the low-voltage lithium battery can be effectively monitored, and the state data of the low-voltage lithium battery can be obtained.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery management, and in particular relates to a low-voltage lithium battery monitoring circuit. Background Art

[0002] Currently, there are many small electronic products on the market that use low-voltage lithium batteries. The output voltage of these low-voltage lithium batteries is below 25V. However, these low-voltage lithium batteries have a low level of intelligence and cannot perform charge and discharge management, and cannot accurately monitor the status data of the low-voltage lithium batteries.

[0003] Therefore, how to monitor the status of low-voltage lithium batteries is a technical problem to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of the present invention is to solve the technical problem that the prior art does not monitor the status of low-voltage lithium batteries and cannot obtain the charge and discharge data of low-voltage lithium batteries. To this end, the present invention provides a low-voltage lithium battery monitoring circuit, wherein the low voltage is below 25V, and the circuit includes:

[0005] The lithium battery charging current detection module is connected to the main control chip and is used to detect the charging current of the lithium battery;

[0006] A power adapter discharge current detection module, connected to the main control chip, for detecting the discharge current of the power adapter;

[0007] A lithium battery discharge current detection module is connected to the main control chip and is used to detect the discharge current of the lithium battery;

[0008] The charging module is connected to the lithium battery and the main control chip respectively.

[0009] Furthermore, the lithium battery charging current detection module specifically includes:

[0010] Pin 1 and pin 2 of chip U2 are both connected to the current input IP+, and pin 3 and pin 4 of the chip U2 jointly output the current VBAT LI. Pin 5 of the chip U2 is grounded, pin 7 of the chip U2 is connected to one end of the resistor R5, and the other end of the resistor R5 is respectively connected to one end of the resistor R6 and the sampling voltage signal CURENT_1, the other end of the resistor R6 and the other end of the capacitor C7 are both grounded, one end of the capacitor C7 is connected to one end of the resistor R6, and pin 8 of the chip U2 is respectively connected to the 5V power supply and the other end of the capacitor C3, and one end of the capacitor C3 is grounded.

[0011] Furthermore, the power adapter discharge current detection module specifically includes:

[0012] Pin 1 and pin 2 of chip U3 are both connected to the current input +VPOWER, pin 3 and pin 4 of the chip U3 jointly output 25V current, pin 5 of the chip U3 is grounded, pin 7 of the chip U3 is connected to one end of the resistor R23, the other end of the resistor R23 is respectively connected to one end of the resistor R28 and the sampling voltage signal CURENT_3, the other end of the resistor R28 and the other end of the capacitor C15 are both grounded, one end of the capacitor C15 is connected to one end of the resistor R28, pin 8 of the chip U3 is respectively connected to the 5V power supply and the other end of the capacitor C14, and one end of the capacitor C14 is grounded.

[0013] Furthermore, the lithium battery discharge current detection module specifically includes:

[0014] Pin 1 and pin 2 of chip U4 are both connected to current input +VBAT LI, pin 3 and pin 4 of the chip U4 jointly output 25V current, pin 5 of the chip U4 is grounded, pin 7 of the chip U4 is connected to one end of the resistor R33, the other end of the resistor R33 is respectively connected to one end of the resistor R36 and the sampling voltage signal CURENT_2, the other end of the resistor R36 and the other end of the capacitor C17 are both grounded, one end of the capacitor C17 is connected to one end of the resistor R36, pin 8 of the chip U4 is respectively connected to a 5V power supply and the other end of the capacitor C16, and one end of the capacitor C16 is grounded.

[0015] Furthermore, the charging module specifically includes:

[0016] The first pin of the chip U1 is connected to the other end of the capacitor C6, the 15th pin of the chip U1 is connected to the other end of the resistor R7 and one end of the capacitor C8, the other end of the capacitor C8 is grounded, the 16th pin of the chip U1 is connected to the first end of the MOS tube Q1, the second end of the MOS tube Q1, one end of the capacitor C6 and one end of the resistor R7 are all connected to one end of the capacitor C5, one end of the capacitor C5 is also connected to +VPOWER, the other end of the capacitor C5 is grounded, the third end of the MOS tube Q1 is connected to the positive electrode of the diode D3, and the negative electrode of the diode D3 is connected to the positive electrode of the diode D3. The cathode of the diode D4 is connected to one end of the inductor L1, and the other end of the inductor L1 is respectively connected to the 13th pin of the chip U1 and one end of the resistor R4. The anode of the diode D4 is grounded. The other end of the resistor R4 is respectively connected to one end of the capacitor C4 and one end of the resistor R8. One end of the capacitor C4 is also connected to IP+. The other end of the capacitor C4 is grounded. One end of the resistor R8 is also respectively connected to one end of the capacitor C9 and the 14th pin of the chip U1. The other end of the resistor R8 is respectively connected to the other end of the capacitor C9, the 10th pin of the chip U1 and one end of the resistor R15. The 9th pin of the chip U1 is connected to one end of the resistor R14, the other end of the resistor R14 is connected to one end of the capacitor C12, the 8th pin of the chip U1 is connected to one end of the capacitor C11, the 11th pin of the chip U1 is connected to one end of the capacitor C10, the 7th pin of the chip U1 is connected to one end of the resistor R18, the 6th pin of the chip U1 is respectively connected to the other end of the resistor R13 and one end of the resistor R17, one end of the resistor R13 is respectively connected to the cathode of the diode D6 and one end of the resistor R16, the anode of the diode D6, the other end of the resistor R16, and the resistor R17 The other end of the resistor R15, the other end of the resistor R18, the 3rd pin of the chip U1, the 2nd pin of the chip U1, the other end of the capacitor C10, the other end of the capacitor C11, and the other end of the capacitor C12 are all connected to the other end of the resistor R15, the 2nd pin of the chip U1 is also grounded, the 4th pin of the chip U1 is connected to the other end of the resistor R10, the 5th pin of the chip U1 is connected to the other end of the resistor R12, one end of the resistor R10 is connected to the other end of the resistor R9, one end of the resistor R12 is connected to the other end of the resistor R11, and one end of the resistor R9 and one end of the resistor R11 are both grounded.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This utility model provides a low-voltage lithium battery monitoring circuit. Compared with the existing technology, this circuit includes a lithium battery charging current detection module connected to the main control chip for detecting the charging current of the lithium battery; a power adapter discharge current detection module connected to the main control chip for detecting the discharge current of the power adapter; a lithium battery discharge current detection module connected to the main control chip for detecting the discharge current of the lithium battery; and a charging module connected to the lithium battery and the main control chip, respectively. This circuit can effectively monitor the status of low-voltage lithium batteries and obtain low-voltage lithium battery status data. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of this specification, the following is a brief introduction to the drawings required for use in the embodiments. The drawings described below are only some of the embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 The figure shows a schematic diagram of the structure of the lithium battery charging current detection module provided by the embodiment of this description;

[0021] Figure 2 FIG2 is a schematic diagram of the structure of the power adapter discharge current detection module provided by the embodiment of this description;

[0022] Figure 3 The figure shows a schematic structural diagram of a lithium battery discharge current detection module provided in this embodiment;

[0023] Figure 4 FIG. 1 is a schematic diagram of the structure of the charging module provided in this embodiment of the present invention. DETAILED DESCRIPTION

[0024] To help those skilled in the art better understand the technical solutions in this specification, the following will provide a clear and complete description of the technical solutions in the embodiments of this specification, in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this specification, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in this specification without creative work should fall within the scope of protection of this specification.

[0025] like Figure 1The following is a schematic diagram of the structure of a low-voltage lithium battery monitoring circuit provided in an embodiment of this specification. Although this specification provides the structures shown in the following embodiments or figures, the structures described may include more or fewer structures after partial merging based on routine or no creative effort. These structures are not limited to the structures shown in the embodiments or figures of this specification. When the structures described are applied in actual devices or end products, they can be executed sequentially or in parallel according to the embodiments or module structures.

[0026] The low-voltage lithium battery monitoring circuit provided in the embodiments of this specification can be applied to various low-voltage lithium batteries. The circuit includes:

[0027] The lithium battery charging current detection module is connected to the main control chip and is used to detect the charging current of the lithium battery;

[0028] A power adapter discharge current detection module, connected to the main control chip, for detecting the discharge current of the power adapter;

[0029] A lithium battery discharge current detection module is connected to the main control chip and is used to detect the discharge current of the lithium battery;

[0030] The charging module is connected to the lithium battery and the main control chip respectively.

[0031] In the embodiments of this application, Figure 1 The above is a structural diagram of a lithium battery charging current detection module, which specifically includes:

[0032] Pin 1 and pin 2 of chip U2 are both connected to the current input IP+, and pin 3 and pin 4 of the chip U2 jointly output the current VBAT LI. Pin 5 of the chip U2 is grounded, pin 7 of the chip U2 is connected to one end of the resistor R5, and the other end of the resistor R5 is respectively connected to one end of the resistor R6 and the sampling voltage signal CURENT_1, the other end of the resistor R6 and the other end of the capacitor C7 are both grounded, one end of the capacitor C7 is connected to one end of the resistor R6, and pin 8 of the chip U2 is respectively connected to the 5V power supply and the other end of the capacitor C3, and one end of the capacitor C3 is grounded.

[0033] Specifically, linear current detection from -5A to +5A is possible. The sampled voltage signal CURRENT_1 is divided by resistors R5 and R6 and then input into the ADC module of the main control chip. Similarly, the power adapter discharge current detection module and the lithium battery discharge current detection module described below operate in the same manner. Pin 6 of chips U2, U3, and U4 are all connected to the main control chip. The current input of the lithium battery charging current detection module is connected to the lithium battery, and the current output is grounded via a diode. The current input of the power adapter discharge current detection module is connected to the adapter, and the current input of the lithium battery discharge current detection module is connected to the lithium battery to obtain the detected current value.

[0034] In the embodiments of this application, Figure 2 The above is a schematic diagram of the structure of the power adapter discharge current detection module, which specifically includes:

[0035] Pin 1 and pin 2 of chip U3 are both connected to the current input +VPOWER, pin 3 and pin 4 of the chip U3 jointly output 25V current, pin 5 of the chip U3 is grounded, pin 7 of the chip U3 is connected to one end of the resistor R23, the other end of the resistor R23 is respectively connected to one end of the resistor R28 and the sampling voltage signal CURENT_3, the other end of the resistor R28 and the other end of the capacitor C15 are both grounded, one end of the capacitor C15 is connected to one end of the resistor R28, pin 8 of the chip U3 is respectively connected to the 5V power supply and the other end of the capacitor C14, and one end of the capacitor C14 is grounded.

[0036] In the embodiments of this application, Figure 3 The above is a schematic diagram of the structure of the lithium battery discharge current detection module, which specifically includes:

[0037] Pin 1 and pin 2 of chip U4 are both connected to current input +VBAT LI, pin 3 and pin 4 of the chip U4 jointly output 25V current, pin 5 of the chip U4 is grounded, pin 7 of the chip U4 is connected to one end of the resistor R33, the other end of the resistor R33 is respectively connected to one end of the resistor R36 and the sampling voltage signal CURENT_2, the other end of the resistor R36 and the other end of the capacitor C17 are both grounded, one end of the capacitor C17 is connected to one end of the resistor R36, pin 8 of the chip U4 is respectively connected to a 5V power supply and the other end of the capacitor C16, and one end of the capacitor C16 is grounded.

[0038] In the embodiments of this application, Figure 4 The above is a schematic diagram of the structure of the charging module, which specifically includes:

[0039] The first pin of the chip U1 is connected to the other end of the capacitor C6, the 15th pin of the chip U1 is connected to the other end of the resistor R7 and one end of the capacitor C8, the other end of the capacitor C8 is grounded, the 16th pin of the chip U1 is connected to the first end of the MOS tube Q1, the second end of the MOS tube Q1, one end of the capacitor C6 and one end of the resistor R7 are all connected to one end of the capacitor C5, one end of the capacitor C5 is also connected to +VPOWER, the other end of the capacitor C5 is grounded, the third end of the MOS tube Q1 is connected to the positive electrode of the diode D3, and the negative electrode of the diode D3 is connected to the positive electrode of the diode D3. The cathode of the diode D4 is connected to one end of the inductor L1, and the other end of the inductor L1 is respectively connected to the 13th pin of the chip U1 and one end of the resistor R4. The anode of the diode D4 is grounded. The other end of the resistor R4 is respectively connected to one end of the capacitor C4 and one end of the resistor R8. One end of the capacitor C4 is also connected to IP+. The other end of the capacitor C4 is grounded. One end of the resistor R8 is also respectively connected to one end of the capacitor C9 and the 14th pin of the chip U1. The other end of the resistor R8 is respectively connected to the other end of the capacitor C9, the 10th pin of the chip U1 and one end of the resistor R15. The 9th pin of the chip U1 is connected to one end of the resistor R14, the other end of the resistor R14 is connected to one end of the capacitor C12, the 8th pin of the chip U1 is connected to one end of the capacitor C11, the 11th pin of the chip U1 is connected to one end of the capacitor C10, the 7th pin of the chip U1 is connected to one end of the resistor R18, the 6th pin of the chip U1 is respectively connected to the other end of the resistor R13 and one end of the resistor R17, one end of the resistor R13 is respectively connected to the cathode of the diode D6 and one end of the resistor R16, the anode of the diode D6, the other end of the resistor R16, and the resistor R17 The other end of the resistor R15, the other end of the resistor R18, the 3rd pin of the chip U1, the 2nd pin of the chip U1, the other end of the capacitor C10, the other end of the capacitor C11, and the other end of the capacitor C12 are all connected to the other end of the resistor R15, the 2nd pin of the chip U1 is also grounded, the 4th pin of the chip U1 is connected to the other end of the resistor R10, the 5th pin of the chip U1 is connected to the other end of the resistor R12, one end of the resistor R10 is connected to the other end of the resistor R9, one end of the resistor R12 is connected to the other end of the resistor R11, and one end of the resistor R9 and one end of the resistor R11 are both grounded.

[0040] Specifically, the above charging module can realize trickle charging, constant current charging and constant voltage charging of low-voltage lithium batteries, wherein the +VPOWER in the charging module is connected to the mains, that is, the power adapter, and the IP+ in the charging module is connected to the lithium battery.

[0041] It should be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intervening element at the same time; when an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intervening element at the same time. In addition, the "connection" used here may include wireless connection; the wording "and / or" used includes any unit and all combinations of one or more associated listed items.

[0042] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0043] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0044] In addition, the functional units in the various embodiments of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into a module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0045] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0046] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0047] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

[0048] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A low-voltage lithium battery monitoring circuit, wherein the low voltage is specifically below 25V, characterized in that: The circuit comprises: The lithium battery charging current detection module is connected to the main control chip and is used to detect the charging current of the lithium battery; A power adapter discharge current detection module, connected to the main control chip, for detecting the discharge current of the power adapter; A lithium battery discharge current detection module is connected to the main control chip and is used to detect the discharge current of the lithium battery; The charging module is connected to the lithium battery and the main control chip respectively.

2. The low-voltage lithium battery monitoring circuit according to claim 1, wherein: The lithium battery charging current detection module specifically includes: Pin 1 and pin 2 of chip U2 are both connected to current input IP+, pin 3 and pin 4 of chip U2 jointly output current VBAT LI, pin 5 of chip U2 is grounded, pin 7 of chip U2 is connected to one end of resistor R5, the other end of resistor R5 is respectively connected to one end of resistor R6 and sampling voltage signal CURENT_1, the other end of resistor R6 and the other end of capacitor C7 are both grounded, one end of capacitor C7 is connected to one end of resistor R6, pin 8 of chip U2 is respectively connected to a 5V power supply and the other end of capacitor C3, and one end of capacitor C3 is grounded.

3. The low-voltage lithium battery monitoring circuit according to claim 1, wherein: The power adapter discharge current detection module specifically includes: Pin 1 and pin 2 of chip U3 are both connected to the current input +VPOWER, pin 3 and pin 4 of the chip U3 jointly output 25V current, pin 5 of the chip U3 is grounded, pin 7 of the chip U3 is connected to one end of the resistor R23, the other end of the resistor R23 is respectively connected to one end of the resistor R28 and the sampling voltage signal CURENT_3, the other end of the resistor R28 and the other end of the capacitor C15 are both grounded, one end of the capacitor C15 is connected to one end of the resistor R28, pin 8 of the chip U3 is respectively connected to the 5V power supply and the other end of the capacitor C14, and one end of the capacitor C14 is grounded.

4. The low-voltage lithium battery monitoring circuit according to claim 1, wherein: The lithium battery discharge current detection module specifically includes: Pin 1 and pin 2 of chip U4 are both connected to current input +VBAT LI, pin 3 and pin 4 of the chip U4 jointly output 25V current, pin 5 of the chip U4 is grounded, pin 7 of the chip U4 is connected to one end of the resistor R33, the other end of the resistor R33 is respectively connected to one end of the resistor R36 and the sampling voltage signal CURENT_2, the other end of the resistor R36 and the other end of the capacitor C17 are both grounded, one end of the capacitor C17 is connected to one end of the resistor R36, pin 8 of the chip U4 is respectively connected to a 5V power supply and the other end of the capacitor C16, and one end of the capacitor C16 is grounded.

5. The low-voltage lithium battery monitoring circuit according to claim 1, wherein: The charging module specifically includes: The first pin of the chip U1 is connected to the other end of the capacitor C6, the 15th pin of the chip U1 is connected to the other end of the resistor R7 and one end of the capacitor C8, the other end of the capacitor C8 is grounded, the 16th pin of the chip U1 is connected to the first end of the MOS tube Q1, the second end of the MOS tube Q1, one end of the capacitor C6 and one end of the resistor R7 are all connected to one end of the capacitor C5, one end of the capacitor C5 is also connected to +VPOWER, the other end of the capacitor C5 is grounded, the third end of the MOS tube Q1 is connected to the positive electrode of the diode D3, and the negative electrode of the diode D3 is connected to the positive electrode of the diode D3. The cathode of the diode D4 is connected to one end of the inductor L1, and the other end of the inductor L1 is respectively connected to the 13th pin of the chip U1 and one end of the resistor R4. The anode of the diode D4 is grounded. The other end of the resistor R4 is respectively connected to one end of the capacitor C4 and one end of the resistor R8. One end of the capacitor C4 is also connected to IP+. The other end of the capacitor C4 is grounded. One end of the resistor R8 is also respectively connected to one end of the capacitor C9 and the 14th pin of the chip U1. The other end of the resistor R8 is respectively connected to the other end of the capacitor C9, the 10th pin of the chip U1 and one end of the resistor R15. The 9th pin of the chip U1 is connected to one end of the resistor R14, the other end of the resistor R14 is connected to one end of the capacitor C12, the 8th pin of the chip U1 is connected to one end of the capacitor C11, the 11th pin of the chip U1 is connected to one end of the capacitor C10, the 7th pin of the chip U1 is connected to one end of the resistor R18, the 6th pin of the chip U1 is respectively connected to the other end of the resistor R13 and one end of the resistor R17, one end of the resistor R13 is respectively connected to the cathode of the diode D6 and one end of the resistor R16, the anode of the diode D6, the other end of the resistor R16, and the resistor R17 The other end of the resistor R15, the other end of the resistor R18, the 3rd pin of the chip U1, the 2nd pin of the chip U1, the other end of the capacitor C10, the other end of the capacitor C11, and the other end of the capacitor C12 are all connected to the other end of the resistor R15, the 2nd pin of the chip U1 is also grounded, the 4th pin of the chip U1 is connected to the other end of the resistor R10, the 5th pin of the chip U1 is connected to the other end of the resistor R12, one end of the resistor R10 is connected to the other end of the resistor R9, one end of the resistor R12 is connected to the other end of the resistor R11, and one end of the resistor R9 and one end of the resistor R11 are both grounded.

Images