WO2017219359A1

WO2017219359A1 - Multi-lug battery

Info

Publication number: WO2017219359A1
Application number: PCT/CN2016/087084
Authority: WO
Inventors: 尹帮实; 李辉
Original assignee: 华为技术有限公司
Priority date: 2016-06-24
Filing date: 2016-06-24
Publication date: 2017-12-28

Abstract

A multi-lug battery (10), comprising a battery core (101) and at least two pairs of positive and negative lugs (103), wherein the at least two pairs of positive and negative lugs (103) are respectively located at two ends of the battery core (101) and are axially symmetrical or centrally symmetrical. One pair of positive and negative lugs (103) is connected to a charging circuit, and another pair of positive and negative lugs (103) is connected to a discharging circuit, wherein the charging circuit and the discharging circuit are connected to an electric quantity management control logic, and the electric quantity management control logic is used for switching the charging circuit and the discharging circuit. By means of the solution, impedances of charging and discharging loops are reduced, and large-current charging and discharging are supported.

Description

Multi-pole battery

Technical field

The present invention relates to the field of battery technologies, and in particular, to a multi-pole battery.

Background technique

Lithium-ion battery, also known as lithium battery, has the advantages of large discharge current, small volume, low internal resistance, long life and no memory effect, and is widely used in various mobile terminals. However, lithium-ion batteries are equipped with a protective plate to protect the battery. The battery tab is the channel that connects the battery protection board to the internal active material.

In the prior art, the polar ear of the lithium battery is one of the positive electrode and the negative electrode, and is packaged on the same side of the battery core. In a large current discharge scene, the heat consumption on the channel is high, and the casing is likely to be hot. In another prior art, the positive and negative ear of the lithium battery are distributed on both sides of the cell, and the width of the tab is widened to support large current discharge, but the positive and negative ear distribution on both sides of the cell causes The discharge loop is long and the discharge loop impedance is increased.

Summary of the invention

In view of this, the embodiment of the invention provides a multi-pole battery, which reduces the impedance of the charging and discharging circuit and supports large current charging and discharging.

In a first aspect, an embodiment of the present invention provides a multi-pole battery including a battery core and two pairs of positive and negative ear corresponding to the battery core, wherein one of the two pairs of positive and negative ear The positive and negative electrodes are located at one end of the cell, and the other pair of positive and negative electrodes are located at the opposite end of the cell. Among them, a pair of positive and negative ears are connected to the charging circuit, and a pair of positive and negative ears are connected to the discharge circuit, thereby reducing the loop impedance and supporting large current charging and discharging.

In combination with the first aspect, in a first implementation manner of the first aspect, the battery core comprises a positive electrode plate and a negative electrode plate, wherein the two positive and negative electrode ears are connected to the positive electrode plate and the two negative electrodes The ear is connected to the negative plate. The positive electrode is taken out from the positive electrode plate, and the negative electrode is taken out from the negative electrode plate.

In combination with the first aspect, in the second implementation of the first aspect, the two pairs of positive and negative ear are centrally symmetric with respect to the center of the battery, thereby reducing process difficulty.

In conjunction with the first aspect, in a third implementation manner of the first aspect, the two pairs of positive and negative ear are axially symmetric, and the axis of symmetry is a mid-perpendicular line of the at least two pairs of positive and negative ear lines, thereby Reduce the difficulty of the process.

In combination with the first aspect, in a fourth implementation manner of the first aspect, the two pairs of positive and negative ear, wherein a pair of positive and negative ear are connected to the charging circuit, and the other pair of positive and negative ears are connected to the discharging circuit , thereby reducing the loop impedance and supporting large current charge and discharge.

With reference to the fourth implementation manner of the first aspect, in a fifth implementation manner of the first aspect, the charging circuit and the discharging circuit are connected to a power management control logic, where the power management control logic is configured to switch the a charging circuit and the discharging circuit. The power management control logic can flexibly control the switching of the charge and discharge circuits.

In conjunction with all of the above implementations, in a sixth implementation of the first aspect, the battery includes at least two cells. Each cell has two pairs of positive and negative ear, respectively, for better scalability.

Through the above scheme, the impedance of the charge and discharge circuit is greatly reduced, and the large current charge and discharge is supported.

DRAWINGS

1A is a schematic structural diagram of a lithium battery according to an embodiment of the present invention;

1B is a schematic structural diagram of an electric core according to an embodiment of the present invention;

1C is a schematic structural diagram of a lithium battery of a mobile terminal according to an embodiment of the present invention;

2 is a schematic diagram of a lithium battery supporting large current charge and discharge according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of another lithium battery supporting large current charge and discharge according to an embodiment of the present invention; FIG.

FIG. 4 is a schematic diagram of another lithium battery supporting large current charging and discharging according to an embodiment of the present invention.

detailed description

The technical solutions of the embodiments of the present invention will be described in detail in the following with reference to the accompanying drawings.

The lithium battery is a rechargeable battery. During charging and discharging, lithium ions are intercalated and deintercalated between the two electrodes: during charging, lithium ions are deintercalated from the positive electrode, and the electrolyte is embedded in the negative electrode, and the negative electrode is in a lithium-rich state. The opposite is true when discharging. Lithium batteries are representative of modern high performance batteries. The battery of the embodiment of the invention is exemplified by a lithium battery, and can also be applied to other types of batteries; Pools can be used on a variety of mobile terminals, such as cell phones.

Referring to FIG. 1A, an embodiment of the present invention provides a lithium battery 10, which is specifically composed of a battery cell 101, a protection plate 102, a tab 103, and a casing 104. The battery cell 101 is wrapped by a casing 104 (the battery core 101 is not visible in FIG. 1A), and the casing 104 may be made of a material such as plastic, aluminum plastic film or the like. Here, the shape of the lithium battery 10 is not limited, and common shapes such as a rectangular parallelepiped, a cylinder, a button type, and the like.

Lithium-ion batteries have high requirements for charge and discharge. Overcharge, over-discharge, and short-circuit are strictly prohibited during use. Otherwise, the battery will cause fire, explosion, etc. The function of the protection board 102 is to protect the battery cells of the rechargeable battery. The battery is safe and stable during charging and discharging.

The main functions of the lithium battery protection board 102 are as follows:

1. Overcharge protection function: Overcharge protection function means that when the overcharge detection voltage is reached, it is forbidden to continue charging by the charger. In other words, the MOS transistor (Metal Oxide Semiconductor) that controls the overcharge is turned off, and charging is stopped.

2. Over-discharge protection function: The over-discharge protection function stops discharging the load when the battery voltage becomes low. The MOS tube that controls the over-discharge is put into the off state, and is prohibited from discharging. This process is exactly the opposite of the action when overcharge detection.

3. Overcurrent protection function: The overcurrent protection function stops the discharge of the load when a large current is consumed. The purpose of this function is to protect the battery and the MOS tube to ensure the safety of the battery under working conditions. After overcurrent detection, the battery will return to normal after being disconnected from the load and can be recharged or discharged.

4, short-circuit protection function: mainly includes two parts, one is to protect the integrated circuit, as the core of the protection chip, by sampling the battery voltage to judge, issue various commands to control the MOS tube, manage the battery. The second is the MOS tube, which acts as a switch in the protection board circuit.

Referring to FIG. 1B, the battery cell 101 is mainly composed of a positive electrode plate 1011, a separator 1012, a negative electrode plate 1013, and an electrolyte. The positive electrode plate 1011, the separator 1012, and the negative electrode plate 1013 are wound or laminated (in the stacked manner in FIG. 1B), and the electrolyte is injected. That is, the battery cell 101 is formed. Wherein, the separator 1012 is located between the positive electrode plate 1011 and the negative electrode plate 1012. The electrolyte may be a solid electrolyte, a liquid electrolyte, a gel electrolyte or the like. At the time of charging, lithium ions are deintercalated from the positive electrode plate 1011, and the electrolyte is inserted into the negative electrode plate 1012, so that lithium ions are accumulated in the negative electrode plate 1012, and the discharge is reversed. The tab 103 is a metal conductor from which the positive and negative electrodes are led out from the battery 101. Generally, the metal strip is sandwiched by two sheets of film. The film is an insulating portion of the tab 103 for preventing the metal strip from being A short circuit occurs between the diaphragms 1012.

1C is a schematic structural view of a lithium battery of a mobile terminal. The lithium battery 10 is composed of a battery core 101 and a protection plate 102, the tab 103, the outer casing 104. The battery cell 101 includes a positive electrode plate 1011, a diaphragm 1012, and a negative electrode plate 1013. The positive electrode plate 1011 and the negative electrode plate 1013 are connected to the tabs 103 through the protective plate 102. The lithium battery 10 is charged and discharged through the tab 103. When charging, the tab 103 is connected to an external power source, such as a mobile phone charger or a USB interface (Universal Serial Bus) for charging; when discharging, the tab 103 is connected to the inside of the mobile phone. The load is discharged. The protection board 102 includes a protection integrated circuit and a MOS transistor.

According to the structural characteristics of the lithium battery, the maximum charge termination voltage should be 4.2V (V is the voltage unit "volts"), and can not be overcharged, otherwise the battery will be scrapped due to too much lithium ion loss from the positive electrode. Lithium batteries have high requirements for charge and discharge, and can be charged by a dedicated constant current and constant voltage charger. Constant current charging is the main charging phase of lithium batteries. Most of the power is flushed into the lithium battery at this stage. This stage is characterized by constant charging current, and the charging voltage increases with the increase of power, so it is called constant current stage. At this time, the battery MOS tube is already turned on, and the mobile phone is powered by an externally charged power source. Normally, the constant current is charged to 4.2V and then switched to constant voltage charging. Constant voltage charging is the final stage of battery charging. At this time, the battery voltage has been charged to 4.2V, which is close to full. This stage is characterized by constant charging voltage and charging current. Gradually decreases as the battery approaches fullness. When the constant voltage charging current drops to 100mA (A is the current unit "amperes", 1A = 1000mA), the charging should be stopped.

Due to the internal structure of the lithium battery, lithium ions cannot all move to the positive electrode during discharge, and a part of lithium ions must be reserved at the negative electrode to ensure that lithium ions can be smoothly inserted into the channel during the next charging. Otherwise, the battery life will be shortened accordingly. In order to ensure that some lithium ions remain in the graphite layer after discharge, it is necessary to strictly limit the minimum voltage at the end of discharge, that is, the lithium battery cannot be over-discharged. The discharge termination voltage is usually 3.0V and the minimum cannot be lower than 2.5V. The length of battery discharge is related to the battery capacity and discharge current.

Referring to FIG. 2, an embodiment of the present invention provides a lithium battery 10 supporting a large current charge and discharge, including a battery core 101 and two pairs of positive and negative electrodes 103. Optionally, two pairs of positive and negative ear 103 are respectively located at two ends of the battery 101, wherein a pair of positive and negative ears at one end are used for charging, and a pair of positive and negative ears at the other end are used for discharging. In this embodiment, corresponding to the two pairs of positive and negative electrodes 103, the cell 101 can have two pairs of positive and negative electrodes, wherein the positive electrode is led out from the positive electrode and the negative electrode is drawn from the negative electrode. In the positive and negative ear 103 of the lithium battery case, the positive and negative signs can be respectively marked, the positive electrode is +, and the negative electrode is -. Alternatively, the two pairs of positive and negative ear 103 can be symmetrically distributed centrally with respect to the center of the battery to reduce the difficulty of the production process. A pair of positive and negative electrodes and a pair of positive and negative electrodes at one end of the cell 101 are used for charging, and another pair of positive and negative electrodes and the other pair of positive and negative electrodes at the other end of the cell 101 are used for discharging. It can be understood that the discharge circuit includes a load, and the charging circuit includes an external power supply. The following embodiments are the same and will not be described again. Charging circuit and discharging circuit Do not use different poles to form a separate charge control circuit and discharge control circuit, which can effectively reduce the charge and discharge loop impedance and support large current charge and discharge.

Lithium-ion batteries can be equipped with a management chip and a charge and discharge control chip. The management chip has a series of registers, which have values such as capacity, temperature, state of charge, and number of discharges. The charge and discharge control chip is mainly used to control the charging and discharging process of the battery. The charging process of lithium-ion battery is divided into two stages, the constant current fast charging phase (when the battery indicator is yellow) and the constant voltage current decreasing phase (the battery indicator light flashes green, the constant current fast charging phase, the battery voltage is gradually increased) The standard voltage to the battery is then transferred to the constant voltage stage under the control chip, the voltage is no longer raised to ensure that it will not overcharge, and the current gradually decreases to zero as the battery power rises, thus completing the charging.

In Fig. 2, a charging control circuit and a discharging control circuit are also provided to protect the charging process and the discharging process of the battery to prevent overcurrent, overvoltage, short circuit and the like. Alternatively, the charge control circuit and the discharge control circuit may include at least one of the above-described management chip and charge and discharge control chip. The above charging control circuit and the discharging control circuit can be connected by the power management control logic so that the charging circuit and the discharging circuit can be switched.

Referring to FIG. 3, two pairs of positive and negative electrodes 103 are respectively located at two ends of the battery core 101 and are axially symmetrically distributed to reduce the difficulty of the production process. The axisymmetric symmetry axis is the mid-perpendicular line of the two pairs of positive and negative ear 103. It can be understood that the positions of the two pairs of positive and negative ear can also be distributed in other positions. The charging circuit and the discharging circuit are the same as those in Fig. 2 described above.

In another embodiment of the present invention, the two pairs of positive and negative ear 103 may also be located at the same end of the battery 101.

Referring to FIG. 4, the lithium battery may include two batteries 101, each of which has two pairs of positive and negative ears 103, a pair of positive and negative ears 103 connected to the discharge circuit, and a pair of positive and negative ears 103 connected to the charging circuit. Two charging circuits and two discharge circuits are connected to the power management control logic, and the power management control logic can manage the charge and discharge of the battery, for example, during charging, when one battery is fully charged, switching to another battery A charging circuit; for example, when a charging circuit of one battery cell is inoperable, switching to a charging circuit of another battery cell. It can be understood that the two pairs of positive and negative electrodes 103 of each of the above-mentioned cells 101 may be symmetrically distributed in the center, or may be distributed in an axisymmetric manner or may be distributed in other positions. The charging circuit and the discharging circuit respectively use different tabs to form a separate charging control circuit and a discharging control circuit, which can effectively reduce the impedance of the charging and discharging circuit and support large current charging and discharging.

In another embodiment of the present invention, a lithium battery may have a plurality of cells 101, and each cell 101 has two pairs. The positive and negative ears 103, a pair of positive and negative ears 103 are connected to the discharge circuit, and the pair of positive and negative ears 103 are connected to the charging circuit, thereby having better expandability. All charging circuits and all discharge circuits are connected to the power management control logic, which manages the charge and discharge of the cells.

Those of ordinary skill in the art will appreciate that the elements, algorithms, and method steps of the various examples described in connection with the embodiments disclosed herein can be implemented in a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. The skilled person will use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

It will be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. It will also be understood that the terms "comprise" and "comprises", "the"," One or more other features, integers, steps, operations, elements, components, and/or grouping thereof.

It will also be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, the first cell can be named a second cell, and similarly, the second cell can be named the first cell without departing from the scope of the invention.

The terminology used in the description of the present invention is for the purpose of describing particular embodiments and is not intended to limit the invention. As used in the specification and the appended claims, the s Instructions.

The units described as separate components are or are not physically separated, and the components displayed as units are or are not physical units, ie, located in one place, or distributed to multiple network units. Some or all of the units are selected according to actual needs to achieve the objectives of the embodiments of the present invention. The functional units in the various embodiments of the present invention are integrated in one processing unit, and each unit is physically physically present, and two or more units are integrated in one unit.

It is understood by those skilled in the art that all or part of the steps of implementing the above method embodiments are performed by hardware related to the program instructions. The foregoing program is stored in a computer readable storage medium, and when executed, the program includes the above method. The steps of the embodiment; and the foregoing storage medium includes: a medium that stores program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

A multi-pole battery, characterized in that the battery comprises a battery core and two pairs of positive and negative ear corresponding to the battery core, wherein a pair of positive and negative ear of the two pairs of positive and negative ear Located at one end of the cell, another pair of positive and negative ears are located at opposite ends of the cell.
The battery according to claim 1, wherein the battery cell comprises a positive electrode plate and a negative electrode plate, wherein the two positive and negative electrode ears are connected to the positive electrode plate, and the two negative electrode ears are connected to the negative electrode plate. board.
The battery according to claim 1, wherein said two pairs of positive and negative electrodes are centrally symmetrical with respect to a center of said battery.
The battery according to claim 1, wherein said two pairs of positive and negative electrodes are axisymmetric, and the axis of symmetry is a mid-perpendicular line of said two pairs of positive and negative ear lines.
The battery according to claim 1, wherein said pair of positive and negative electrodes are connected to a charging circuit, and the other pair of positive and negative electrodes are connected to a discharge circuit.
The battery according to claim 5, wherein said charging circuit and said discharging circuit are connected to power management control logic for switching said charging circuit and said discharging circuit.
A battery according to any of claims 1-6, wherein said battery comprises at least two cells.