CN114695978A - Battery protection devices, batteries and terminal equipment - Google Patents

Abstract

The disclosure relates to the technical field of electronic equipment, and particularly provides a battery protection device, a battery and terminal equipment. The battery protection device includes: the protection circuit board is provided with a battery pack positive terminal, a battery pack negative terminal, a positive output terminal, a first negative output terminal and a second negative output terminal, wherein the battery pack positive terminal is connected with the positive output terminal, and the battery pack negative terminal is respectively connected with the first negative output terminal and the second negative output terminal; the first connector comprises a positive electrode pin and a first negative electrode pin, the positive electrode pin is connected with the positive electrode output terminal, and the first negative electrode pin is connected with the first negative electrode output terminal; the second connector comprises a second negative electrode pin which is connected with the second negative electrode output terminal; and the switching unit is used for switching and conducting the first negative electrode pin and the second negative electrode pin with the electric appliance. The device disclosed by the invention has the advantages of simple wiring, reduction in the size of the protection circuit board, reduction in cost and improvement in battery capacity.

Description

Battery protection devices, batteries and terminal equipment

technical field

The present disclosure relates to the technical field of electronic equipment, and in particular, to a battery protection device, a battery and a terminal device.

Background technique

Lithium batteries are widely used in electronic equipment, new energy vehicles and other fields as energy storage devices that can be recharged and discharged cyclically. The material of the lithium battery itself determines that it cannot be overcharged, overdischarged, overcurrent, short-circuited and ultra-high temperature charge and discharge, so the lithium battery will be equipped with a circuit protection board.

With the development of fast charging technology, the charging current of the battery is also increasing, and the structure of the corresponding battery protection circuit is also more complicated, resulting in an increase in the volume of the protection board and a more complicated processing technology. In the case of a certain battery volume, the increase of the protective plate occupies the space of the battery cell accordingly, resulting in a decrease in the battery capacity.

SUMMARY OF THE INVENTION

In order to solve the technical problem of the complex structure of the battery protection plate in the related art, the embodiments of the present disclosure provide a battery protection device, a battery, and a terminal device.

In a first aspect, embodiments of the present disclosure provide a battery protection device, including:

The protection circuit board is provided with a battery pack positive terminal, a battery pack negative terminal, a positive output terminal, a first negative output terminal and a second negative output terminal, the battery pack positive terminal is connected to the positive output terminal, and the battery pack negative terminal The terminals are respectively connected to the first negative output terminal and the second negative output terminal;

a first connector, comprising a positive electrode pin and a first negative electrode pin, the positive electrode pin is connected to the positive output terminal, and the first negative electrode pin is connected to the first negative output terminal;

a second connector including a second negative pin connected to the second negative output terminal; and

The switching unit is used to switch and conduct the first negative electrode pin, the second negative electrode pin and the electrical device.

In some embodiments, the switching unit includes a first end, a second end and a third end, the first end is connected to the first negative pin, and the second end is connected to the second negative pin , the third end is connected to the electrical device.

In some embodiments, the switching unit is provided on the protection circuit board, the switching unit includes a fourth terminal, a fifth terminal and a sixth terminal, the fourth terminal is connected to the negative terminal of the battery pack, so The fifth terminal is connected to the first negative output terminal, and the sixth terminal is connected to the second negative output terminal.

In some embodiments, the battery protection device further includes a control unit, the control unit is connected to the control terminal of the switching unit, and the control unit is used for:

When the battery pack is charged, the first negative pin is controlled to be disconnected from the circuit of the electrical device, and the second negative pin is connected to the circuit of the electrical device;

When the battery pack is discharged, the first negative pin is controlled to be connected to the circuit of the electrical device, and the second negative pin is disconnected from the circuit of the electrical device.

In some embodiments, the battery protection device is applied to a terminal device, and the control unit is a processor of the terminal device.

In some embodiments, the battery protection device further includes:

a first flexible circuit board, the first connector is connected to the protection circuit board through the first flexible circuit board;

A second flexible circuit board, the second connector is connected to the protection circuit board through the second flexible circuit board.

In some embodiments, the first flexible circuit board includes a first sub-flexible board and a second sub-flexible board, one end of the first sub-flexible board is connected to the positive output terminal, and an end of the second sub-flexible board is connected to the positive output terminal. One end is connected to the first negative output terminal, and the other ends of the first sub-flex board and the second sub-flex board are connected to the first connector.

In some embodiments, the protection circuit board includes a wiring layer, a first shielding layer and a second shielding layer, and the wiring layer is provided between the first shielding layer and the second shielding layer.

In a second aspect, embodiments of the present disclosure provide a battery, including:

The battery protection device according to any embodiment of the first aspect; and

A battery pack, the positive tab of the battery pack is connected to the positive terminal of the battery pack, and the negative tab of the battery pack is connected to the negative terminal of the battery pack.

In a third aspect, embodiments of the present disclosure provide a terminal device, including the battery according to any embodiment of the second aspect.

A battery protection device according to an embodiment of the present disclosure includes a protection circuit board, a first connector, a second connector, and a switching unit. The positive pin of the first connector is connected to the positive output terminal of the protection circuit board, and the first negative pin is connected to the positive output terminal of the protection circuit board. The first negative output terminal of the protection circuit board, the second negative pin of the second connector is connected to the second negative output terminal of the protection circuit board, and the switching unit switches the first negative pin, the second negative pin and the electrical device on. Through the switching unit control circuit switching, when the battery is charging, the current can flow in from the first connector, and flow out from the second connector after passing through the battery cell, so that the protection circuit board and the two connectors are both unidirectional currents. lower temperature rise. Moreover, the unidirectional current routing of the protection circuit board is simple, the processing technology of the circuit board is simple, and the cost is reduced. In addition, the size of the protection circuit board is reduced, and the volume of the battery cell can be increased and the battery capacity can be increased under the same battery volume.

Description of drawings

In order to illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a battery protection device in the related art.

FIG. 2 is a schematic structural diagram of a battery protection device according to some embodiments of the present disclosure.

FIG. 3 is a schematic structural diagram of a battery protection device according to some embodiments of the present disclosure.

4 is a circuit schematic diagram of a battery protection device according to some embodiments of the present disclosure.

FIG. 5 is a circuit schematic diagram of a battery protection device according to other embodiments of the present disclosure.

FIG. 6 is a schematic structural diagram of a protection circuit board according to other embodiments of the present disclosure.

Detailed ways

The technical solutions of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure. In addition, the technical features involved in the different embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other.

With the development of electronic equipment, fast charging technology has become a major selling point of equipment, so the research of fast charging technology has become one of the key research directions of major manufacturers. For lithium batteries, in order to prevent battery overcharge, overdischarge, overcurrent, short circuit and heat problems, lithium batteries will be equipped with circuit protection boards.

In the related art, taking a smartphone as an example, with the increasing charging current, some mobile phone batteries adopt two flexible printed circuit (FPC, Flexible Printed Circuit) outlet solutions in order to meet the current capacity, temperature rise requirements and other indicators. As shown in FIG. 1 , the positive and negative electrodes of the battery cell 10 are welded on the protection board 20 , one end of the first FPC 31 and the second FPC 32 are welded on the protection board 20 , and the other end is connected to the mainboard of the mobile phone through a connector.

The wirings on the first FPC 31 and the second FPC 32 are connected in parallel, so that the charging current can be divided. That is, the wirings on the first FPC 31 and the second FPC 32 are both bidirectional current paths, and correspondingly, the wirings on the protection board 20 are also bidirectional current paths. This makes the traces on the FPC and the protection board very complicated, and a safe distance should be reserved between the positive and negative traces of the bidirectional current path, and between the traces and the vias, in order to meet the requirements of current flow and temperature rise , had to widen the protective plate and FPC volume. Since the protection plate and the cells are encapsulated in the battery together, the volume of the cells is bound to shrink under the condition of a certain battery volume, which reduces the battery capacity. In addition, communication I2C bus, protection components, etc. need to be arranged on the protection board and FPC, which leads to more complicated circuits. If necessary, the number of layers of the protection board and FPC needs to be increased, resulting in complicated processing technology and increased production cost.

Based on the above-mentioned defects in the related art, the embodiments of the present disclosure provide a battery protection device, a battery, and a terminal device.

In a first aspect, the present disclosure provides a battery protection device, which can be applied to a device including a charging and discharging battery, such as a smart terminal device and the like. In some embodiments, the battery protection device of the present disclosure includes: a protection circuit board, a first connector, a second connector, and a switching unit.

The protection circuit board is the protection board of the battery. It is provided with current wiring, I2C bus and other circuits, as well as protection devices such as fuel gauge, sampling resistor, protection chip, etc. The arrangement and principle of the protection device are described in detail below. , only the current path will be described here.

The protection circuit board is provided with a positive terminal of the battery pack (B+) and a negative terminal of the battery pack (B-). In one example, the positive terminal (B+) of the battery pack and the negative terminal (B-) of the battery pack are welding areas reserved on the surface of the circuit board, so that the positive electrode of the battery pack is welded with the positive terminal (B+) of the battery pack, and the battery pack The negative electrode of the battery pack is welded to the negative terminal (B-) of the battery pack.

The protection circuit board is also provided with a positive output terminal (P+), a first negative output terminal (P-'), and a second negative output terminal (P-). The positive output terminal (P+) is connected to the positive electrode of the battery pack through the internal wiring The terminal (B+) is connected, and the first negative output terminal (P-') and the second negative output terminal (P-) are connected to the negative terminal (B-) of the battery pack through the wiring in the board.

The first connector and the second connector are used to connect with the electrical device. In one example, the first connector and the second connector can be BTB (board-to-board) connectors, so that quick disassembly and assembly can be realized. In the embodiment of the present disclosure, the first connector includes a positive pin and a first negative pin, the positive pin is connected to the positive output terminal (P+) on the protection circuit board, and the first negative pin is connected to the protection circuit board The first negative output terminal (P-') is connected. The second connector includes a second negative pin, and the second negative pin is connected to the second negative output terminal (P-) on the protection circuit board.

In one example, the first connector and the second connector can be connected to the protection circuit board through the flexible circuit board FPC, so that the connection lines of the respective pins can be printed on the FPC. It will be described below, and will not be described in detail here.

The switching unit is used to switch and conduct the circuit between the first negative electrode pin, the second negative electrode pin and the electrical device, that is, the switching unit is used to switch and conduct the two current lines. In some embodiments, the switching unit may be implemented by a switching circuit.

In one example, the switching unit is integrated on the protection circuit board, and the control switching may be implemented by a control unit of the protection circuit board, or the control switching may be implemented by a control unit other than the protection circuit board. This disclosure does not limit this.

In another example, the switching unit is provided outside the protection circuit board, and the control switching is realized by a control unit outside the protection circuit board. For example, in a smart phone, the switching unit can be arranged on the mainboard of the mobile phone, and the control of the switching unit can be realized by the processor of the mobile phone.

It can be understood that the switching unit can realize the switching conduction of the negative circuit, so that when the battery is charged, the current path can be switched as follows: the current flows in from the first connector, and flows out from the second connector after passing through the protection circuit board and the cell. Therefore, both the protection circuit board and the two connectors are unidirectional current paths, the wiring structure and processing technology are simplified, and the cost is reduced. Also, it can be understood that since the protection circuit board and the connector are unidirectional current paths, it is easier to set up the traces to increase the overcurrent capability. And due to the simplification of the circuit, the volume of the protection board can be reduced, and the volume of the battery cell can be increased accordingly, and the battery capacity can be increased.

When the battery is discharged, that is, when supplying power to the electrical device, the switching unit can switch the current path as follows: the current flows from the first negative pin of the first connector, and after passing through the protection circuit board and the battery cell, the first connection The positive terminal of the device flows out. Since the discharge current of the battery is much lower than the charging current (for example, taking a smartphone as an example, the discharge current is usually 2A to 3A, while the charging current can reach 10A to 12A), so the temperature rise and overcurrent capability of the discharge current are relatively low. The current circulation loop is realized by the first connector.

It can be seen from the above that the battery protection device in the embodiment of the present disclosure controls the switching of the charging and discharging circuit through the switching unit, thereby simplifying the wiring structure of the protection circuit board, correspondingly reducing the volume of the protection board, simplifying the processing technology of the protection board, reducing the cost, and improving the battery capacity. . And when charging, the protection circuit board and the connector are both unidirectional current paths, which is more conducive to the temperature rise requirements during fast charging.

Some specific embodiments of the battery protection device of the present disclosure are shown in FIGS. 2-5 . In the embodiments of the present disclosure, the structure and principle of the battery protection device of the present disclosure will be described by taking a smartphone scenario as an example.

As shown in FIG. 2 , in this embodiment, the battery protection device includes a protection circuit board 100 , a first flexible circuit board 200 and a second flexible circuit board 300 . The protection circuit board 100 is a printed circuit board (PCB, Printed Circuit Board), and is provided with a battery pack positive terminal (B+) and a battery pack negative terminal (B-). In this embodiment, the positive terminal (B+) of the battery pack and the negative terminal (B-) of the battery pack are the welding areas provided on the surface of the protection circuit board 100 , and the welding area is set in the middle of the protection circuit board 100 . The sheet is welded with the positive terminal (B+) of the battery pack, and the negative sheet of the battery pack is welded with the negative terminal (B-) of the battery pack.

One end of the protection circuit board 100 is provided with a positive output terminal (P+) and an I2C bus terminal. The I2C bus terminal includes the SDA data signal terminal and the SCL clock signal terminal. The I2C bus terminal is connected to the fuel gauge on the protection circuit board 100 through the internal wiring. (not shown in the drawings) connection, the I2C bus is a data communication line, which can be understood by those skilled in the art, and will not be repeated in this disclosure. The positive output terminal (P+) is connected to the positive terminal (B+) of the battery pack through the wiring inside the board.

The middle of the protection circuit board 100 is provided with a first negative output terminal (P-'), and the first negative output terminal (P-') is connected to the negative terminal (B-) of the battery pack through the wiring in the board. It should be noted that, in this embodiment, in order to improve the space utilization rate of the protection circuit board 100, the first negative output terminal (P-') is arranged on the back of the protection circuit board 100 (represented by a dotted line in the drawing), that is, A double-sided PCB board for protecting the circuit board 100 . Of course, those skilled in the art can understand that the first negative output terminal (P-') can also be disposed on the front side of the protection circuit board 100, that is, on the same side as the positive output terminal (P+), which is not limited in the present disclosure.

Continuing to refer to FIG. 2 , in this embodiment, the first connector 230 is provided on the first flexible circuit board 200 . The first flexible circuit board 200 includes a first sub-flex board 210 and a second sub-flex board 220 . The positive wire (P+) and the I2C bus are printed on the first sub-flex board 210, so that after one end of the first sub-flex board 210 is welded to the protection circuit board 100, the positive wire (P+) on the first sub-flex board 210 is welded. ) is connected to the positive output terminal on the protection circuit board 100 , and the I2C bus is respectively connected to the SDA data signal terminal and the SCL clock signal terminal on the protection circuit board 100 .

A negative electrode trace (P-') is printed on the second sub-flexible board 220, so that after one end of the second sub-flexible board 220 is welded to the protection circuit board 100, the negative electrode trace (P-') on the second sub-flexible board 220 is welded. ') is connected to the first negative output terminal (P-') on the protection circuit board 100.

The other ends of the first sub-flex board 210 and the second sub-flex board 220 are pressed together by the first connector 230, so that each pin on the first connector 230 corresponds to each line of the first flexible circuit board 200 connect. That is, the positive pin (P+) on the first connector 230 is connected to the positive wiring (P+) on the first sub-flex board 210 , and the SDA pin on the first connector 230 is connected with the first sub-flex board 210 The SDA bus on the first connector 230 is connected to the SCL bus on the first sub-flex board 210, and the first negative pin (P-') on the first connector 230 is connected to the second sub-flex board 210. The negative trace (P-') on the flexible board 220 is connected.

It should be noted that, in this embodiment, the first flexible circuit board 200 adopts a layered design, that is, the second sub-flexible board 220 is connected to the first negative output terminal (P-') on the back of the protection circuit board 100, and the first A sub-flex board 210 is connected to the positive output terminal (B+) and the I2C bus terminal on the front of the protection circuit board 100 , and then the first sub-flex board 210 and the second sub-flex board 220 are pressed together through the first connector 230 . On the one hand, the layered connection of the front and back sides of the protection circuit board 100 is realized to avoid bending and damage of the flexible circuit board; Occupation of the internal space of the mobile phone by the circuit board 200 .

The other end of the protection circuit board 100 is provided with a second negative output terminal (P-), and the second negative output terminal (P-) is connected to the negative terminal (B-) of the battery pack through the wiring inside the board. That is, both the first negative output terminal (P-') and the second negative output terminal (P-) are connected to the battery negative terminal (B-).

The second connector 310 is disposed on the second flexible circuit board 300 . The second flexible circuit board 300 is printed with a negative wire (P-), so that after one end of the second flexible circuit board 300 is welded with the protection circuit board 100, the negative wire (P-) on the second flexible circuit board 300 Connect to the second negative output terminal (P-) on the protection circuit board 100. The second negative pin (P-) on the second connector 310 is correspondingly connected to the negative lead (P-) printed on the second flexible circuit board 300 .

As shown in FIG. 3 , in this embodiment, the battery protection device further includes a switching unit 400 , and the switching unit 400 is a switching switch, which includes a first end, a second end and a third end, and the first end and the second end are two A switching terminal, the third terminal is a fixed terminal. Specifically, the first end is connected to the first negative pin (P-') of the first connector 230, the second end is connected to the second negative pin (P-) of the second connector 310, and the third end is connected to Electrical device 500 .

It is worth noting that, in this embodiment, the battery protection device is applied to a smart phone, and the electrical device 500 can be the mainboard of the mobile phone, and the switching unit 400 can also be arranged on the mainboard of the mobile phone, and the control end of the switching unit 400 is connected to the mobile phone. processor (SoC). That is, the mobile phone processor is used as the control unit to control the switching unit 400 to realize the switching of the current path. Of course, those skilled in the art can understand that the switching unit 400 may also be disposed outside the mainboard of the mobile phone, such as a subboard of the mobile phone, which is not limited in the present disclosure.

When the mobile phone is charging, as shown in FIG. 3 , the mobile phone processor controls the switching unit 400 to switch the first negative pin (P-') of the first connector 230 to be disconnected from the circuit of the electrical device 500, while the second connection is The second negative pin (P-) of the device 310 is connected to the circuit of the electrical device 500 . At this time, the external charging current flows in from the positive pin (P+) of the first connector 230, passes through the protection circuit board 100 and the battery pack 600, and flows out from the second negative pin (P-) of the second connector 310, forming a charge current cycle.

When the mobile phone is discharging, as shown in FIG. 3 , the mobile phone processor controls the switching unit 400 to switch the first negative pin (P-') of the first connector 230 to conduct the circuit of the electrical device 500, and the second connection The second negative pin (P-) of the device 310 is disconnected from the circuit of the powered device 500 . At this time, the discharge current flows into the first negative pin (P-') of the first connector 230, and after passing through the protection circuit board 100 and the battery pack 600, flows into the positive pin (P+) of the first connector 230, forming a The battery discharge current cycle.

It can be seen from the above that the battery protection device of the embodiment of the present disclosure controls the switching of the charging and discharging circuit through the switching unit when the mobile phone is charged, thereby simplifying the wiring structure of the protection circuit board, correspondingly reducing the volume of the protection board, simplifying the processing technology of the protection board, and reducing the cost and increase battery capacity. And when charging, the protection circuit board and the connector are both unidirectional current paths, which is more conducive to the temperature rise requirements during fast charging.

In some embodiments, considering that when the mobile phone is charging, the unidirectional charging current path that meets the fast charging overcurrent requirement may generate a large electromagnetic induction, thereby affecting the functions of the radio frequency signal and geomagnetic sensor of the mobile phone. Therefore, in the protection circuit The board 100 is also provided with an electromagnetic shielding structure.

Specifically, the protection circuit board 100 is a multi-layer PCB structure, which includes a wiring layer, a first shielding layer and a second shielding layer. A shielded ground wire is arranged on the first shield layer and the second shield layer, and the shielded ground wire is connected to the GND pins on the first connector 230 and the second connector 310, and is connected to the main ground of the mobile phone through the GND pins. The wiring layer is arranged between the first shielding layer and the second shielding layer, so that the upper and lower shielding layers form electromagnetic shielding for the wiring layer, so as to avoid the electromagnetic induction caused by the large charging current to affect the radio frequency and sensor functions of the mobile phone, and ensure the use of the mobile phone. stability.

In some embodiments, the battery pack 600 may be a single cell, or may be a cell pack formed of a plurality of cells in series or in parallel, which is not limited in the present disclosure. For example, the embodiment of FIG. 4 shows a schematic circuit diagram of a battery protection device with a double-series cell, and the embodiment of FIG. 5 shows a schematic circuit diagram of a battery protection device with a single cell. The embodiments of FIG. 4 and FIG. 5 will be described below, respectively.

As shown in FIG. 4 , in this embodiment, the battery pack 600 adopts a double-series cell structure, that is, the battery pack 600 includes two series-connected cells. For the electrical series structure and implementation, those skilled in the art may refer to the related art, which will not be repeated in the present disclosure.

In this embodiment, the battery protection device of the present disclosure further includes a battery protection device and related circuits. Specifically, as shown in FIG. 4 , the protection circuit board 100 is also provided with a fuel gauge. On the one hand, the fuel gauge is connected to the sampling resistor Rs, and the charging and discharging current is calculated by detecting the voltage across the sampling resistor, and then communicates with the mobile phone through the I2C bus. Processor communication, interactive data information and control commands. On the other hand, the fuel gauge is connected to the MOS tube on the current path to realize a section of protection of the battery, such as overcharge voltage protection, overdischarge voltage protection, short circuit protection, charging overcurrent protection, discharge overcurrent protection, multi-cell voltage balance And so on, according to the control command to turn off the MOS tube to achieve battery protection. The protection circuit board 100 is also provided with a protection chip. The protection chip is used to realize the secondary protection of the battery. When an abnormality of the circuit is detected, the fuse on the control current path is blown to realize battery protection.

As shown in FIG. 5 , in this embodiment, the battery pack 600 adopts a single cell, that is, the battery pack 600 includes one cell. In this embodiment, the battery protection device further includes a battery protection device and related circuits. Specifically, as shown in Figure 4, the protection circuit board is also provided with a fuel gauge, protection chip 1 and protection chip 2. In the figure, CS and GND represent the pins of the protection chip to detect charging and discharging current, and SRN and SRP represent the power The pin for the meter to detect the charging and discharging current. The fuel gauge realizes charging voltage, current detection and power calculation by detecting the voltage across the sampling resistor Rs. The fuel gauge exchanges information and control commands with the processor through the I2C bus. The protection chip 1 and the protection chip 2 are used as primary and secondary protection for battery charging and discharging, and the charging and discharging current is detected by the sampling resistor Rs to realize the charging overcurrent protection, discharging overcurrent protection and short circuit protection of the battery. At the same time, both the protection chip 1 and the protection chip 2 can realize overcharge voltage protection, overdischarge voltage protection, and 0V charge prohibition protection. When the circuit is abnormal, the protection chip 1 can control the MOS1 to cut off, and the protection chip 2 can control the MOS2 to cut off.

The structure and working principle of the protection circuit board 100 in the embodiments of FIG. 4 and FIG. 5 have been described above. For those not described in detail, those skilled in the art can understand and implement it with reference to related technologies, which will not be repeated in this disclosure. .

It should be noted that, in the embodiments of FIG. 3 to FIG. 5, considering that the processing function of the mobile phone is often integrated on the mainboard of the mobile phone, in the above embodiment, the switching unit 400 and the control unit (that is, the mobile phone processor) are integrated in the Therefore, the circuit structure of the protection circuit board 100 can be simplified, the volume of the protection circuit board 100 can be correspondingly reduced, and the battery capacity can be improved.

In other embodiments, the switching unit 400 may also be disposed on the protection circuit board 100 . Specifically, in some embodiments, as shown in FIG. 6 , the switching unit 400 is integrated on the protection circuit board 100 , and the switching unit 400 includes a fourth end, a fifth end and a sixth end, and the fourth end is a fixed end, The fifth terminal and the sixth terminal are two switching terminals. The fourth terminal is connected to the negative terminal (B-) of the battery pack through the internal wiring, the fifth terminal is connected to the first negative output terminal (P-') by the internal wiring, and the sixth terminal is connected to the second negative terminal through the internal wiring. Output terminal (P-). The control unit may be a controller outside the protection board, such as a device processor; or may be a control chip provided on the protection circuit board 100 , which is not limited in the present disclosure. Through the control of the switching unit 400 by the control unit, the switching of the charging and discharging paths can also be implemented, which can be understood and implemented by those skilled in the art with reference to the foregoing description, and details are not described herein again.

It can be seen from the above that, in the battery protection device of the embodiment of the present disclosure, the switching unit is used to control the circuit switching. When the battery is charging, the current can flow into the first connector and flow out through the second connector after passing through the battery cell, thereby protecting the circuit board and the two All connectors are unidirectional current, and the temperature rise of the battery is lower when charging. Moreover, the unidirectional current routing of the protection circuit board is simple, the processing technology of the circuit board is simple, and the cost is reduced. In addition, the size of the protection circuit board is reduced, and the volume of the battery cell can be increased and the battery capacity can be increased under the same battery volume.

In a second aspect, embodiments of the present disclosure provide a battery, which can be applied to a terminal device or the like. In some embodiments, the battery of the present disclosure includes the battery protection device and the battery pack described in any one of the embodiments of the first aspect, and the battery protection device may refer to the foregoing embodiments, which will not be repeated here. The battery pack may be a single-cell battery pack, or a battery pack formed by connecting multiple cells in series, which is not limited in the present disclosure.

The positive tab of the battery pack is connected to the positive terminal (B+) of the battery pack of the protection circuit board 100 , and the negative tab of the battery pack is connected to the negative terminal (B-) of the battery pack of the protection circuit board 100 . In one example, the positive terminal (B+) of the battery pack and the negative terminal (B-) of the battery pack are welding areas provided on the surface of the protection circuit board 100, the positive electrode of the battery pack is welded with the positive terminal (B+) of the battery pack, and the battery pack The negative electrode of the battery pack is welded to the negative terminal (B-) of the battery pack.

It can be seen from the above that the battery in the embodiment of the present disclosure is switched by the switching unit control circuit. When the battery is charged, the current can flow into the first connector and flow out through the second connector after passing through the battery cell, thereby protecting the circuit board and the two connections. The devices are all unidirectional current, and the temperature rise of the battery is lower when charging. Moreover, the unidirectional current routing of the protection circuit board is simple, the processing technology of the circuit board is simple, and the cost is reduced. In addition, the size of the protection circuit board is reduced, and the volume of the battery cell can be increased and the battery capacity can be increased under the same battery volume.

In a third aspect, embodiments of the present disclosure provide a terminal device, where the terminal device includes the battery according to any one of the embodiments of the second aspect. The terminal device may be any device suitable for containing a rechargeable and dischargeable battery, such as a smart phone, a smart watch, a notebook computer, etc., which is not limited in the present disclosure.

It can be seen from the above that in the terminal device of the embodiment of the present disclosure, the switching unit is used to control the circuit switching. When the battery is charged, the current can flow into the first connector and flow out through the second connector after passing through the battery cell, thereby protecting the circuit board and the two The connectors are all unidirectional current, and the temperature rise of the battery is lower when charging. Moreover, the unidirectional current routing of the protection circuit board is simple, the processing technology of the circuit board is simple, and the cost is reduced. In addition, the size of the protection circuit board is reduced, and the volume of the battery cell can be increased and the battery capacity can be increased under the same battery volume.

Obviously, the above-mentioned embodiments are only examples for clear description, and are not intended to limit the embodiments. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. However, the obvious changes or changes derived from this are still within the protection scope of the present disclosure.

Claims (10)

1. A battery protection device, comprising:

the protection circuit board is provided with a battery pack positive terminal, a battery pack negative terminal, a positive output terminal, a first negative output terminal and a second negative output terminal, the battery pack positive terminal is connected with the positive output terminal, and the battery pack negative terminal is respectively connected with the first negative output terminal and the second negative output terminal;

the first connector comprises a positive electrode pin and a first negative electrode pin, the positive electrode pin is connected with the positive electrode output terminal, and the first negative electrode pin is connected with the first negative electrode output terminal;

the second connector comprises a second negative electrode pin which is connected with the second negative electrode output terminal; and

and the switching unit is used for switching and conducting the first negative electrode pin and the second negative electrode pin with the electric appliance.

2. The battery protection device of claim 1,

the switching unit comprises a first end, a second end and a third end, the first end is connected with the first negative electrode pin, the second end is connected with the second negative electrode pin, and the third end is connected with the electric device.

3. The battery protection device of claim 1,

the switching unit is arranged on the protection circuit board and comprises a fourth end, a fifth end and a sixth end, the fourth end is connected with the negative electrode terminal of the battery pack, the fifth end is connected with the first negative electrode output terminal, and the sixth end is connected with the second negative electrode output terminal.

4. The battery protection device according to any one of claims 1 to 3, further comprising a control unit, the control unit being connected to the control terminal of the switching unit, the control unit being configured to:

when the battery pack is charged, the first negative electrode pin is controlled to be disconnected with a circuit of the electric device, and the second negative electrode pin is controlled to be conducted with the circuit of the electric device;

and when the battery pack discharges, the first negative electrode pin is controlled to be connected with a circuit of the electric device, and the second negative electrode pin is controlled to be disconnected with the circuit of the electric device.

5. The battery protection device of claim 4,

the battery protection device is applied to terminal equipment, and the control unit is a processor of the terminal equipment.

6. The battery protection device of claim 1, further comprising:

the first flexible circuit board is connected with the protection circuit board through the first connector;

and the second connector is connected with the protection circuit board through the second flexible circuit board.

7. The battery protection device of claim 6,

the first flexible circuit board comprises a first sub flexible board and a second sub flexible board, one end of the first sub flexible board is connected with the positive electrode output terminal, one end of the second sub flexible board is connected with the first negative electrode output terminal, and the other end of the first sub flexible board and the other end of the second sub flexible board are connected with the first connector.

8. The battery protection device of claim 1,

the protection circuit board comprises a wiring layer, a first shielding layer and a second shielding layer, wherein the wiring layer is arranged between the first shielding layer and the second shielding layer.

9. A battery, comprising:

a battery protection device according to any one of claims 1 to 8; and

the positive plate of the battery pack is connected with the positive terminal of the battery pack, and the negative plate of the battery pack is connected with the negative terminal of the battery pack.

10. A terminal device characterized by comprising the battery according to claim 9.

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