Battery pack with zero-volt charging function

Abstract

The invention discloses a battery pack with a zero-volt charging function, the battery pack with the zero-volt charging function comprises a box body, a battery module and a protection plate, the battery module and the protection plate are both installed in the box body, and the battery module is electrically connected with the protection plate; the protection plate comprises an electric quantity monitoring chip, an analog front-end chip and a charging and discharging tube module, the analog front-end chip is electrically connected with the electric quantity monitoring chip, the charging and discharging tube module and the battery module, one end of the charging and discharging tube module is electrically connected with the battery module, and the other end of the charging and discharging tube module can be electrically connected with an adaptive charger; the charging and discharging tube module comprises a charging tube, a discharging tube and a pre-charging tube. The charging tube, the discharging tube and the pre-charging tube are electrically connected with the analog front-end chip. The battery pack with the zero-volt charging function manages the charging and discharging of the battery module through the charging and discharging tube module, and the analog front-end chip protects the whole battery pack through the turn-off and turn-on control of the charging and discharging tube module.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a battery pack with a zero-volt charging function. Background Art

[0002] Lithium battery is a battery with lithium (Li) as the main material. It has high energy density, long service life and light weight. It is widely used in portable electronic devices, electric vehicles, energy storage systems and other fields. According to the different internal chemical structures and application methods, lithium batteries are divided into many types, the most common of which include lithium-ion batteries (Li-ion) and lithium polymer batteries (Li-Po). Lithium batteries are generally monitored, managed and protected by lithium battery management systems (BMS) of lithium batteries. Since lithium batteries are sensitive to parameters such as temperature, voltage, charge and discharge current, the role of BMS is to ensure that the battery operates within a safe range, thereby extending battery life, improving efficiency and preventing battery damage and even dangerous events (such as overheating, fire, explosion). Zero-volt charging of lithium batteries refers to the safe charging of the battery when it is fully discharged or even when the voltage drops to 0V or close to 0V.

[0003] Under normal circumstances, excessive discharge of lithium batteries will cause irreversible damage to battery materials, especially electrode materials. Existing lithium battery packs generally control the discharge limit of lithium batteries through protection circuits to prevent excessive discharge. These protection circuits will cut off the output of the battery when the battery voltage is lower than the preset value to prevent the battery from entering the zero volt state. When the battery voltage drops to zero volts, it is easy to damage the lithium battery during charging. Summary of the invention

[0004] Based on this, it is necessary to provide a battery pack with a zero-volt charging function to address the technical problem that existing lithium batteries are easily damaged when charged at zero volts.

[0005] A battery pack with a zero-volt charging function comprises a box, a battery module and a protection board. The battery module and the protection board are both installed inside the box, and the battery module is electrically connected to the protection board.

[0006] The protection board includes a power monitoring chip, an analog front-end chip and a charge and discharge tube module. The analog front-end chip is electrically connected to the power detection meter module, the charge and discharge tube module and the battery module respectively. One end of the charge and discharge tube module is electrically connected to the battery module, and the other end of the charge and discharge tube module can be electrically connected to an adapted charger.

[0007] The charge and discharge tube module includes a charge tube, a discharge tube and a pre-charge tube, and the charge tube, the discharge tube and the pre-charge tube are electrically connected to the analog front-end chip respectively.

[0008] The analog front-end chip is configured as an AFE chip, and is provided with a DSG pin, a CHG pin, a ZVCHG pin, a VCC pin, a PACK pin and a BAT pin; wherein the discharge tube is electrically connected to the PACK pin, the DSG pin, the VCC pin, the charging tube, the pre-charging tube and the output end of the charger respectively; the charging tube is electrically connected to the CHG pin, the VCC pin, the pre-charging tube and the battery module respectively; the pre-charging tube is electrically connected to the VCC pin, the ZVCHG pin and the battery module respectively; the PACK pin is electrically connected to the adapted charger; and the BAT pin is electrically connected to the battery module.

[0009] In one embodiment, the above-mentioned analog front-end chip includes a drive control module, a charge and discharge tube drive module, and a pre-charge tube drive module; the drive control module is electrically connected to the charge and discharge tube drive module and the pre-charge tube drive module, and is respectively connected to the VCC pin and the BAT pin; the charge and discharge tube drive module is electrically connected to the discharge tube through the DSG pin and is electrically connected to the charge tube through the GHG pin; the pre-charge tube drive modules are electrically connected to the pre-charge tube through the ZVCHG pin.

[0010] In one embodiment, the above-mentioned analog front-end chip also includes a voltage conversion module, the input end of the voltage conversion module is electrically connected to the output end of the battery module, and the output end of the voltage conversion module is electrically connected to the input end of the power monitoring chip.

[0011] In one embodiment, the analog front-end chip further includes a power balancing module, which is disposed between the battery module and the voltage conversion module, wherein an input end of the power balancing module is electrically connected to an output end of the battery module.

[0012] In one of the embodiments, the power monitoring chip includes a current detection resistor, and an input end of the current detection resistor is electrically connected to an output end of the voltage conversion module.

[0013] In one of the embodiments, the power monitoring chip further includes a thermistor, and an input end of the thermistor is electrically connected to an output end of the voltage conversion module.

[0014] The above-mentioned battery pack with zero-volt charging function manages the charging and discharging of the battery module through the charging and discharging tube module, and the analog front-end chip protects the battery pack as a whole by controlling the shutdown and opening of the charging and discharging tube module. The analog front-end chip manages the charging and discharging of the battery module by controlling the shutdown and opening of the charging tube, the discharging tube and the pre-charging tube. When the battery module terminal voltage, i.e., V BAT When in the zero volt state, the charger terminal voltage is V PACKThe battery module is also in a low voltage state, so that the battery module cannot provide a starting voltage for the analog front-end chip. Based on this, in the present invention, when the battery pack enters the zero-volt charging tube mode, in this mode, the pre-charging tube acts as a zero-volt charging tube, and its gate is driven by the ZVCHG pin to support the PACK pin terminal voltage; during zero-volt charging, the charging tube and the discharge tube are turned off, and the pre-charging tube is charged by a charger with a pre-charging function. At this time, if V ZVCHG When clamped to about 3.5V, V PACK It can be supported to above 5.5V, thereby reaching the starting voltage of the analog front-end chip. Then, the charger outputs 2.5V voltage to the battery module through the pre-charging tube for zero-volt charging, that is, pre-charging. When the battery module voltage rises to a normal level, the pre-charging is ended and fast charging is performed, thereby realizing the zero-volt charging function of the battery module of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a battery pack with a zero-volt charging function in one embodiment; Figure 2 A schematic diagram of the structure of a battery pack with a zero-volt charging function in one embodiment; Figure 3 A schematic diagram of an exploded structure of a battery pack with a zero-volt charging function in one embodiment. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0017] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0018] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0019] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0021] It should be noted 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 a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0022] See also Figures 1 to 3The present invention discloses a battery pack with a zero-volt charging function, which includes a box body 100, a battery module 200 and a protection board 300. The battery module 200 and the protection board 300 are both installed inside the box body 100, and the battery module 200 is electrically connected to the protection board 300. Among them, the protection board 300 includes a power monitoring chip 310, an analog front-end chip 320 and a charge-discharge tube module 330. The analog front-end chip 320 is electrically connected to the power detection meter module, the charge-discharge tube module 330 and the battery module respectively. One end of the charge-discharge tube module 330 is electrically connected to the battery module 200, and the other end of the charge-discharge tube module 330 can be electrically connected to an adapted charger, so that the charge-discharge tube module 330 can manage the charge and discharge of the battery module 200, and the analog front-end chip 320 protects the battery pack as a whole by controlling the shutdown and startup of the charge-discharge tube module 330. Specifically, the charge and discharge tube module 330 includes a charging tube 331, a discharge tube 332 and a pre-charging tube 333. The charging tube 331, the discharge tube 332 and the pre-charging tube 333 are electrically connected to the analog front-end chip 320 respectively. Thus, the analog front-end chip 320 manages the charging and discharging of the battery module 200 by controlling the shutdown and opening of the charging tube 331, the discharge tube 332 and the pre-charging tube 333. In this embodiment, the analog front-end chip 320 is set as an AFE chip, and is provided with a DSG pin, a CHG pin, a ZVCHG pin, a VCC pin, a PACK pin and a BAT pin; wherein the discharge tube 332 is electrically connected to the PACK pin, the DSG pin, the VCC pin, the charging tube 331, the pre-charging tube 333 and the output end of the charger respectively; the charging tube 331 is electrically connected to the CHG pin, the VCC pin, the pre-charging tube 333 and the battery module 200 respectively; the pre-charging tube 333 is electrically connected to the VCC pin, the ZVCHG pin and the battery module 200 respectively; the PACK pin is electrically connected to the adapted charger; and the BAT pin is electrically connected to the battery module 200. In practical applications, when the terminal voltage of the battery module 200, i.e., V BAT When in the zero volt state, the charger terminal voltage is V PACK The battery module 200 is also in a low voltage state, so that the battery module 200 cannot provide a starting voltage for the analog front-end chip 320. Based on this, in the present invention, when the battery pack enters the zero-volt charging tube 331 mode, in this mode, the pre-charging tube 333 acts as the zero-volt charging tube 331, and its gate is driven by the ZVCHG pin to support the PACK pin terminal voltage; when charging at zero volts, the charging tube 331 and the discharge tube 332 are closed, and the pre-charging tube 333 is charged by a charger with a pre-charging function. At this time, if V ZVCHG When clamped to about 3.5V, V PACKIt can be supported to above 5.5V, thereby reaching the starting voltage of the analog front-end chip 320. Then, the charger outputs a voltage of 2.5V to the battery module 200 through the pre-charging tube 333 for zero-volt charging, that is, pre-charging. When the voltage of the battery module 200 rises to a normal level, the pre-charging is ended and fast charging is performed, thereby realizing the zero-volt charging function of the battery module 200 of the present invention.

[0023] Further, the analog front-end chip 320 includes a drive control module 321, a charge and discharge tube drive module 322, and a pre-charge tube drive module 323; the drive control module 321 is electrically connected to the charge and discharge tube drive module 322 and the pre-charge tube drive module 323, respectively, and is connected to the VCC pin and the BAT pin respectively; the charge and discharge tube drive module 322 is electrically connected to the discharge tube 332 through the DSG pin, and is electrically connected to the charge tube 331 through the GHG pin; the pre-charge tube 333 drives each module to be electrically connected to the pre-charge tube 333 through the ZVCHG pin. Thus, the drive control module 321 can judge and select the charge and discharge mode according to the voltage and current conditions of the battery module 200, and then, the charge and discharge tube drive module 322 drives and controls the discharge tube 332 and the charge tube 331, and the pre-charge tube drive module 323 drives and controls the pre-charge tube 333, so as to realize the charge and discharge management of the battery module 200.

[0024] Furthermore, the analog front-end chip 320 also includes a voltage conversion module 324, the input end of the voltage conversion module 324 is electrically connected to the output end of the battery module 200, and the output end of the voltage conversion module 324 is electrically connected to the input end of the power monitoring chip. The voltage conversion module 324 can convert the battery voltage at the output end of the battery module 200, and then provide the converted voltage value to the power monitoring chip to complete the voltage acquisition of the battery module 200.

[0025] Furthermore, the analog front-end chip 320 also includes a power balancing module 325, which is arranged between the battery module 200 and the voltage conversion module 324, wherein the input end of the power balancing module 325 is electrically connected to the output end of the battery module 200, and the output end of the power balancing module 325 is electrically connected to the input end of the voltage conversion module 324, so as to realize the balancing function of the battery pack.

[0026] Furthermore, the power monitoring chip 310 includes a current detection resistor 311 , and an input end of the current detection resistor 311 is electrically connected to an output end of the voltage conversion module 324 , so that the power monitoring chip 310 can detect and calculate the current value through the current detection resistor 311 .

[0027] Furthermore, the power monitoring chip 310 also includes a thermistor 312, and the input end of the thermistor 312 is electrically connected to the output end of the voltage conversion module 324. Thus, the power monitoring chip 310 can detect and calculate the battery temperature value through the thermistor 312, and at the same time, calculate the charging status of the battery module 200 in combination with the voltage value and the current value.

[0028] In summary, the battery pack with zero-volt charging function disclosed in the present invention manages the charging and discharging of the battery module through the charging and discharging tube module, and the analog front-end chip protects the battery pack as a whole by controlling the shutdown and opening of the charging and discharging tube module. The analog front-end chip manages the charging and discharging of the battery module by controlling the shutdown and opening of the charging tube, the discharging tube and the pre-charging tube. When the terminal voltage of the battery module, i.e., V BAT When in the zero volt state, the charger terminal voltage is V PACK The battery module is also in a low voltage state, so that the battery module cannot provide a starting voltage for the analog front-end chip. Based on this, in the present invention, when the battery pack enters the zero-volt charging tube mode, in this mode, the pre-charging tube acts as a zero-volt charging tube, and its gate is driven by the ZVCHG pin to support the PACK pin terminal voltage; during zero-volt charging, the charging tube and the discharge tube are turned off, and the pre-charging tube is charged by a charger with a pre-charging function. At this time, if V ZVCHG When clamped to about 3.5V, V PACK It can be supported to above 5.5V, thereby reaching the starting voltage of the analog front-end chip. Then, the charger outputs 2.5V voltage to the battery module through the pre-charging tube for zero-volt charging, that is, pre-charging. When the battery module voltage rises to a normal level, the pre-charging is ended and fast charging is performed, thereby realizing the zero-volt charging function of the battery module of the present invention.

[0029] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A battery pack with zero-volt charging function, characterized in that: include: The box body, the battery module and the protection board are installed inside the box body, and the battery module is electrically connected to the protection board; The protection board includes a power monitoring chip, an analog front-end chip and a charge-discharge tube module. The analog front-end chip is electrically connected to the power detection meter module, the charge-discharge tube module and the battery module respectively. One end of the charge-discharge tube module is electrically connected to the battery module, and the other end of the charge-discharge tube module can be electrically connected to an adapted charger. The charge and discharge tube module includes a charge tube, a discharge tube and a pre-charge tube, and the charge tube, the discharge tube and the pre-charge tube are electrically connected to the analog front-end chip respectively; The analog front-end chip is configured as an AFE chip, and is provided with a DSG pin, a CHG pin, a ZVCHG pin, a VCC pin, a PACK pin and a BAT pin; wherein the discharge tube is electrically connected to the PACK pin, the DSG pin, the VCC pin, the charging tube, the pre-charging tube and the output end of the charger respectively; the charging tube is electrically connected to the CHG pin, the VCC pin, the pre-charging tube and the battery module respectively; the pre-charging tube is electrically connected to the VCC pin, the ZVCHG pin and the battery module respectively; the PACK pin is electrically connected to the adapted charger; and the BAT pin is electrically connected to the battery module.

2. The battery pack with zero-volt charging function according to claim 1, characterized in that: The analog front-end chip includes a drive control module, a charge and discharge tube drive module, and a pre-charge tube drive module; the drive control module is electrically connected to the charge and discharge tube drive module and the pre-charge tube drive module, and is respectively connected to the VCC pin and the BAT pin; the charge and discharge tube drive module is electrically connected to the discharge tube through the DSG pin and to the charge tube through the GHG pin; the pre-charge tube drive modules are electrically connected to the pre-charge tube through the ZVCHG pin.

3. The battery pack with zero-volt charging function according to claim 2, characterized in that: The analog front-end chip also includes a voltage conversion module, an input end of the voltage conversion module is electrically connected to an output end of the battery module, and an output end of the voltage conversion module is electrically connected to an input end of the power monitoring chip.

4. The battery pack with zero-volt charging function according to claim 3, characterized in that: The analog front-end chip also includes a power balancing module, which is arranged between the battery module and the voltage conversion module, wherein the input end of the power balancing module is electrically connected to the output end of the battery module.

5. The battery pack with zero-volt charging function according to claim 4, characterized in that: The power monitoring chip includes a current detection resistor, and an input end of the current detection resistor is electrically connected to an output end of the voltage conversion module.

6. The battery pack with zero-volt charging function according to claim 5, characterized in that: The power monitoring chip also includes a thermistor, and an input end of the thermistor is electrically connected to an output end of the voltage conversion module.

Images