Battery protection device and battery device

Abstract

The present disclosure provides a battery protection device, comprising: a battery protector, the battery protector includes: a first switch unit, the first switch unit is connected between the positive electrode of the battery cell of the battery device and the positive electrode of the battery device; a first voltage acquisition unit, the first voltage acquisition unit acquires the positive electrode voltage of the battery cell; and a first logic processor, the first logic processor is respectively connected to the first voltage acquisition unit and the first switch unit, when the positive electrode voltage of the battery cell acquired by the first voltage acquisition unit is outside the first threshold voltage range, the first logic processor outputs a first control signal, and the first switch unit is turned off based on the first control signal. The present disclosure also provides a battery device.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of battery protection, and in particular relates to a battery protection device and a battery device. Background Art

[0002] In the prior art, there are three types of protection schemes for single-cell batteries in mobile phones. High-end mobile phones require large current charging for fast charging, so dual protection chips need to be cascaded and external shunt resistors are required for protection.

[0003] Apple and Samsung's single-cell batteries use a single protection chip and integrate a MOSFET solution because the charging power does not exceed 25W. The Gauge chip is placed in the battery pack to provide more accurate power measurement.

[0004] The solution for low-end mobile phones in the battery pack will use a single battery protection, and the fuel gauge chip will be placed on the system side.

[0005] At present, the disadvantages of different single-cell battery protection solutions are that, whether on the system side or in the battery pack, for cost considerations, the fuel meter is only responsible for metering and not for protection. The cost of the single-cell integrated protection chip is relatively high and only provides positive end protection.

[0006] And as the battery charging power increases, the loop impedance needs to be reduced as much as possible in the circuit. It is impossible to use a sampling resistor of 5 to 10 milliohms. In the solution where the protection and gauge chips are separated, more than two shunt resistors are required in series, which increases the loop impedance. If the loop impedance can be reduced through integration, better protection can be provided for heat generation in the system.

[0007] With the development of super-fast charging of mobile phones, the application of 2s batteries in mobile phones with charging power above 60W is gradually increasing. The 2s solution has the same structure as the battery pack in the notebook. In the existing architecture, due to the large size and high impedance of the fuse, it causes serious heat generation. Therefore, in actual mobile phones, the secondary protection signal is output to the front end of the Type C port for overcurrent protection.

[0008] The existing single-cell battery protection uses low-side protection on a large scale. However, since the driving voltage of the mobile phone current protection MOSFET changes with the battery voltage, the RDSon of the MOSFET changes relatively slowly. As the charging power of single-cell mobile phones increases, the fuel gauge moves from the system side to the battery pack side to better monitor the actual voltage and temperature of the battery, which has great advantages for lithium battery power management and charging current power management. However, most of the battery pack-side fuel gauges in the prior art do not have MOSFET hardware protection and are insufficiently designed for safety. Moreover, the recovery conditions after protection are fixed, and the battery status cannot be read after protection. Summary of the Invention

[0009] To solve at least one of the above technical problems, the present disclosure provides a battery protection device and a battery device.

[0010] The battery protection device and the battery device of the present disclosure are realized by the following technical solutions.

[0011] According to one aspect of the present disclosure, there is provided a battery protection device, including: a battery protector, and the battery protector includes:

[0012] A first switch unit, which is connected between the positive electrode of the battery cell of the battery device and the positive electrode of the battery device;

[0013] A first voltage acquisition unit, which acquires the positive electrode voltage of the battery cell; and,

[0014] A first logic processor, which is respectively connected to the first voltage acquisition unit and the first switch unit. When the positive electrode voltage of the battery cell acquired by the first voltage acquisition unit is outside the first threshold voltage range, the first logic processor outputs a first control signal, and the first switch unit is turned off based on the first control signal.

[0015] According to the battery protection device of at least one embodiment of the present disclosure, the battery protector further includes a first control unit, and the first control unit is connected between the first switch unit and the first logic processor.

[0016] According to the battery protection device of at least one embodiment of the present disclosure, when the positive electrode voltage of the battery cell acquired by the first voltage acquisition unit is outside the first threshold voltage range, the first logic processor generates a first control signal, and the first control unit turns off the first switch unit based on the first control signal.

[0017] According to the battery protection device of at least one embodiment of the present disclosure, the first voltage acquisition unit includes a first comparator. When the positive electrode voltage of the battery cell acquired by the first voltage acquisition unit is outside the first threshold voltage range, the first voltage acquisition unit outputs a first comparison signal to the first logic processor, and the first logic processor generates the first control signal based on the first comparison signal.

[0018] A battery protection device according to at least one embodiment of the present disclosure, the battery protector further includes a second voltage acquisition unit, the second voltage acquisition unit acquires the positive electrode voltage of the battery device, when the positive electrode voltage of the battery device acquired by the second voltage acquisition unit is outside the second threshold voltage range, the first logic processor outputs a second control signal, and the first switching unit is turned off based on the second control signal.

[0019] A battery protection device according to at least one embodiment of the present disclosure, the battery protector determines whether a load or a charging device is connected to the battery device based on the positive electrode voltage of the battery device acquired by the second voltage acquisition unit.

[0020] A battery protection device according to at least one embodiment of the present disclosure, the second voltage acquisition unit includes a comparator and a current source.

[0021] A battery protection device according to at least one embodiment of the present disclosure, the battery protector obtains the voltage difference between the voltage acquired by the first voltage acquisition unit and the voltage acquired by the second voltage acquisition unit, when the voltage difference is outside the threshold voltage difference range, the battery protector generates a control signal to turn off the first switching unit.

[0022] A battery protection device according to at least one embodiment of the present disclosure, the battery protector further includes a first current acquisition unit, the first current acquisition unit is used to acquire the driving current of the first control unit, when the driving current is outside the driving current threshold range, the first logic processor stops outputting a control signal to the first control unit.

[0023] A battery protection device according to at least one embodiment of the present disclosure, the battery protector further includes a first current acquisition unit, the first current acquisition unit is used to acquire the driving current of the first control unit, when the driving current is outside the driving current threshold range, the battery protector generates record information and / or generates an alarm signal.

[0024] A battery protection device according to at least one embodiment of the present disclosure, the first current acquisition unit includes a third comparator.

[0025] A battery protection device according to at least one embodiment of the present disclosure, the battery protector further includes a second current acquisition unit, the second current acquisition unit acquires the current in the circuit between the first switching unit and the positive electrode of the battery device, when the current acquired by the second current acquisition unit is outside the second threshold current range, the first logic processor outputs a fourth control signal, and the first switching unit is turned off based on the fourth control signal.

[0026] A battery protection device according to at least one embodiment of the present disclosure, the battery protector further includes a first temperature acquisition unit, the first temperature acquisition unit acquires the temperature of the first switching unit, or acquires the temperature of an area adjacent to the first switching unit. When the temperature acquired by the first temperature acquisition unit is greater than or greater than or equal to a threshold temperature, the first logic processor outputs a fifth control signal, and the first switching unit is turned off based on the fifth control signal.

[0027] A battery protection device according to at least one embodiment of the present disclosure, the first switching unit is a field effect transistor.

[0028] A battery protection device according to at least one embodiment of the present disclosure, the first switching unit is a single MOSFET or a combination of multiple MOSFETs.

[0029] A battery protection device according to at least one embodiment of the present disclosure, the battery protector further includes a filter circuit, and the first voltage acquisition unit acquires the positive voltage of the battery cell after being filtered by the filter circuit.

[0030] A battery protection device according to at least one embodiment of the present disclosure, the battery cell includes one or two or more battery units.

[0031] A battery protection device according to at least one embodiment of the present disclosure, further includes:

[0032] A second switching device, the second switching device is connected between the battery protector and the positive electrode of the battery device, and the second switching device includes a second switching unit;

[0033] A first voltage detection unit, the first voltage detection unit detects the voltage between the battery protector and the second switching device; and,

[0034] A second logic processor, when the voltage detected by the first voltage detection unit is outside the voltage threshold range, the second logic processor generates a control signal to control the second switching device to turn off.

[0035] A battery protection device according to at least one embodiment of the present disclosure, further includes a second control unit, and the second control unit is connected between the second switching unit and the second logic processor.

[0036] A battery protection device according to at least one embodiment of the present disclosure, when the voltage detected by the first voltage detection unit is outside the voltage threshold range, the second logic processor generates a control signal, and the second control unit turns off the second switching unit based on the control signal.

[0037] The battery protection device according to at least one embodiment of the present disclosure further includes a second voltage detection unit that detects the positive voltage of the battery device. When the positive voltage of the battery device collected by the second voltage detection unit is greater than the threshold voltage, the second logic processor outputs a control signal to turn off the second switch unit.

[0038] For the battery protection device according to at least one embodiment of the present disclosure, the second logic processor obtains the voltage difference between the voltage detected by the first voltage detection unit and the voltage detected by the second voltage detection unit. When the voltage difference is outside the threshold voltage difference range, the second logic processor generates a control signal to turn off the second switch unit.

[0039] The battery protection device according to at least one embodiment of the present disclosure further includes a current detection unit that detects the current in the circuit between the second switch unit and the positive electrode of the battery device. When the current detected by the current detection unit is greater than the threshold current, the second logic processor outputs a control signal to turn off the second switch unit.

[0040] For the battery protection device according to at least one embodiment of the present disclosure, the second switch device further includes a second temperature acquisition unit that acquires the temperature of the second switch unit or the temperature of the area adjacent to the second switch unit. When the temperature acquired by the second temperature acquisition unit is greater than or greater than or equal to the threshold temperature, the second logic processor outputs a control signal to turn off the second switch unit.

[0041] For the battery protection device according to at least one embodiment of the present disclosure, the second switch unit is a field effect transistor.

[0042] For the battery protection device according to at least one embodiment of the present disclosure, the second switch unit is a single MOSFET or a combination of multiple MOSFETs.

[0043] The battery protection device according to at least one embodiment of the present disclosure further includes a buffer that transmits the positive voltage of the battery cell to the second logic processor at a set proportional voltage value. The second logic processor can generate a control signal based on the voltage value transmitted by the buffer to control the second switch unit.

[0044] For the battery protection device according to at least one embodiment of the present disclosure, the first logic processor and the second logic processor are connected via a control signal line, so that the control signal generated by the second logic processor can be transmitted to the first logic processor, and / or so that the control signal generated by the first logic processor can be transmitted to the second logic processor.

[0045] According to another aspect of the present disclosure, a battery protection device is provided, including:

[0046] At least two second switching devices, at least two switching devices are connected in series between the positive electrode of the battery cell of the battery device and the positive electrode of the battery device, and the second switching device includes a second switching part; and,

[0047] A battery protector, the battery protector includes:

[0048] A first voltage acquisition part, the first voltage acquisition part acquires the positive electrode voltage of the battery cell;

[0049] A first logic processor, the first logic processor is respectively connected to the first voltage acquisition part and the second switching part of the second switching device adjacent to the battery cell. When the positive electrode voltage of the battery cell acquired by the first voltage acquisition part is outside the first threshold voltage range, the first logic processor outputs a first control signal, and the second switching part is turned off based on the first control signal.

[0050] According to the battery protection device of at least one embodiment of the present disclosure, the battery protector further includes a first control part, and the first control part is connected between the second switching part of the second switching device adjacent to the battery cell and the first logic processor.

[0051] According to the battery protection device of at least one embodiment of the present disclosure, when the positive electrode voltage of the battery cell acquired by the first voltage acquisition part is outside the first threshold voltage range, the first logic processor generates a first control signal, and the first control part turns off the second switching part of the second switching device adjacent to the battery cell based on the first control signal.

[0052] According to the battery protection device of at least one embodiment of the present disclosure, the first voltage acquisition part includes a first comparator. When the positive electrode voltage of the battery cell acquired by the first voltage acquisition part is outside the first threshold voltage range, the first voltage acquisition part outputs a first comparison signal to the first logic processor, and the first logic processor generates the first control signal based on the first comparison signal.

[0053] According to the battery protection device of at least one embodiment of the present disclosure, the battery protector further includes a second voltage acquisition part, the second voltage acquisition part acquires the positive electrode voltage of the battery device. When the positive electrode voltage of the battery device acquired by the second voltage acquisition part is outside the second threshold voltage range, the first logic processor outputs a second control signal, and the second switching part of the second switching device adjacent to the battery cell is turned off based on the second control signal.

[0054] According to the battery protection device of at least one embodiment of the present disclosure, the battery protector further includes a first current acquisition unit, and the first current acquisition unit is used to acquire the drive current of the second switching part of the second switching device adjacent to the battery cell. When the drive current is outside the drive current threshold range, the first logic processor stops outputting a control signal to the second switching part of the second switching device adjacent to the battery cell.

[0055] According to the battery protection device of at least one embodiment of the present disclosure, the first current acquisition unit includes a third comparator.

[0056] According to the battery protection device of at least one embodiment of the present disclosure, the battery protector further includes a second current acquisition unit, and the second current acquisition unit acquires the current in the circuit between the second switching part of the second switching device adjacent to the battery cell and the positive electrode of the battery device. When the current acquired by the second current acquisition unit is outside the second threshold current range, the first logic processor outputs a fourth control signal, and the second switching part of the second switching device adjacent to the battery cell is turned off based on the fourth control signal.

[0057] According to the battery protection device of at least one embodiment of the present disclosure, the second switching device further includes a second temperature acquisition unit, and the second temperature acquisition unit acquires the temperature of the second switching part of the second switching device adjacent to the battery cell, or acquires the temperature of the area where the second switching part of the second switching device adjacent to the battery cell is located. When the temperature acquired by the second temperature acquisition unit is greater than or greater than or equal to the threshold temperature, the first logic processor outputs a fifth control signal, and the second switching part of the second switching device adjacent to the battery cell is turned off based on the fifth control signal.

[0058] According to the battery protection device of at least one embodiment of the present disclosure, it further includes:

[0059] A first voltage detection unit, the first voltage detection unit detects the voltage between two second switching devices; and,

[0060] A second logic processor, when the voltage detected by the first voltage detection unit is outside the voltage threshold range, the second logic processor generates a control signal to control the second switching device adjacent to the positive electrode of the battery device to turn off.

[0061] According to the battery protection device of at least one embodiment of the present disclosure, it further includes a second control unit, and the second control unit is connected between the second switching part of the second switching device adjacent to the positive electrode of the battery device and the second logic processor.

[0062] According to the battery protection device of at least one embodiment of the present disclosure, when the voltage detected by the first voltage detection unit is outside the voltage threshold range, the second logic processor generates a control signal, and the second control unit turns off the second switching part of the second switching device adjacent to the positive electrode of the battery device based on the control signal.

[0063] The battery protection device according to at least one embodiment of the present disclosure further includes a second voltage detection unit that detects the positive electrode voltage of the battery device. When the positive electrode voltage of the battery device detected by the second voltage detection unit is greater than the threshold voltage, the second logic processor outputs a control signal to turn off the second switching part of the second switching device adjacent to the positive electrode of the battery device.

[0064] The battery protection device according to at least one embodiment of the present disclosure further includes a current detection unit that detects the current in the circuit between the second switching device adjacent to the positive electrode of the battery device and the positive electrode of the battery device. When the current detected by the current detection unit is greater than the threshold current, the second logic processor outputs a control signal to turn off the second switching part of the second switching device adjacent to the positive electrode of the battery device.

[0065] In the battery protection device according to at least one embodiment of the present disclosure, the second switching device further includes a second temperature acquisition unit that acquires the temperature of the second switching part or the temperature of the area adjacent to the second switching part. When the temperature acquired by the second temperature acquisition unit of the second switching device adjacent to the positive electrode of the battery device is greater than or greater than or equal to the threshold temperature, the second logic processor outputs a control signal to turn off the second switching part of the second switching device adjacent to the positive electrode of the battery device.

[0066] The battery protection device according to at least one embodiment of the present disclosure further includes a buffer that transmits the positive electrode voltage of the battery cell to the second logic processor at a set proportional voltage value, and the second logic processor can generate a control signal based on the voltage value transmitted by the buffer to control the second switching part of the second switching device adjacent to the positive electrode of the battery device.

[0067] In the battery protection device according to at least one embodiment of the present disclosure, the second logic processor obtains the voltage difference between the voltage transmitted by the buffer and the voltage detected by the first voltage detection unit. When the voltage difference is outside the threshold voltage difference range, the second logic processor generates a control signal to turn off the second switching part.

[0068] According to a battery protection device of at least one embodiment of the present disclosure, the second logic processor obtains a voltage difference between the voltage transmitted by the buffer and the voltage detected by the second voltage detection unit. When the voltage difference is outside the threshold voltage difference range, the second logic processor generates a control signal to turn off the second switching unit.

[0069] According to a battery protection device of at least one embodiment of the present disclosure, the second logic processor obtains the loop impedance and the impedances of each switching unit based on the voltage difference between the voltage transmitted by the buffer and the voltage detected by the first voltage detection unit, the voltage difference between the voltage transmitted by the buffer and the voltage detected by the second voltage detection unit, the voltage difference between the voltage detected by the first voltage detection unit and the voltage detected by the second voltage detection unit, the current collected by the second current collection unit, and the current collected by the current detection unit.

[0070] According to a battery protection device of at least one embodiment of the present disclosure, the first logic processor and the second logic processor are connected via a control signal line, so that the control signal generated by the second logic processor can be transmitted to the first logic processor, and / or so that the control signal generated by the first logic processor can be transmitted to the second logic processor.

[0071] According to another aspect of the present disclosure, there is provided a battery device, including: the battery protection device of any one of the above, and a battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] The drawings illustrate exemplary embodiments of the present disclosure and, together with the description thereof, are used to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are included in this specification and form a part of this specification.

[0073] Figure 1 is a schematic circuit structure diagram of a battery protection device according to an embodiment of the present disclosure.

[0074] Figure 2 is a schematic circuit structure diagram of a battery protection device according to another embodiment of the present disclosure.

[0075] Figure 3 is a schematic circuit structure diagram of a battery protection device according to another embodiment of the present disclosure.

[0076] Figure 4 is a schematic circuit structure diagram of a battery protection device according to another embodiment of the present disclosure.

[0077] Figure 5 is a schematic circuit structure diagram of a battery protection device according to another embodiment of the present disclosure.

[0078] Description of Reference Numerals

[0079] 10 battery cells

[0080] 100 battery protector

[0081] 101 First switching part

[0082] 102 First voltage acquisition part

[0083] 103 First logic processor

[0084] 104 First control part

[0085] 105 Second current acquisition part

[0086] 106 Second voltage acquisition part

[0087] 107 First current acquisition part

[0088] 108 First temperature acquisition part

[0089] 109 Control signal line

[0090] 110 Filter circuit

[0091] 111 Buffer

[0092] 200 Switching device

[0093] 201 Second switching part

[0094] 208 Second temperature acquisition part

[0095] 300 Second logic processor

[0096] 301 First voltage detection part

[0097] 302 Second control part

[0098] 303 Current detection part

[0099] 304 Second voltage detection part. Detailed implementation manners

[0100] The present disclosure will be further described in detail below in conjunction with the accompanying drawings and implementation manners. It can be understood that the specific implementation manners described herein are only used to explain the relevant content, rather than limiting the present disclosure. Additionally, it should be noted that for the convenience of description, only the parts related to the present disclosure are shown in the accompanying drawings.

[0101] It should be noted that, without conflict, the embodiments in the present disclosure and the features in the embodiments may be combined with each other. The technical solutions of the present disclosure will be described in detail below with reference to the drawings and in combination with the embodiments.

[0102] Unless otherwise specified, the illustrated exemplary embodiments / examples will be understood to provide exemplary features of various details of some ways in which the technical concept of the present disclosure can be implemented in practice. Therefore, unless otherwise specified, without departing from the technical concept of the present disclosure, the features of various embodiments / examples may be additionally combined, separated, interchanged, and / or rearranged.

[0103] In the drawings, cross-hatching and / or shading are generally used to make the boundaries between adjacent components clear. Thus, unless stated otherwise, the presence or absence of cross-hatching or shading does not convey or imply any preference or requirement regarding the specific material, material properties, dimensions, proportions, commonality between the illustrated components, and / or any other characteristics, attributes, properties, etc. of the components. Additionally, in the drawings, for clarity and / or descriptive purposes, the dimensions and relative dimensions of components may be exaggerated. When the exemplary embodiments can be implemented differently, the specific process sequences may be performed in an order different from that described. For example, two consecutively described processes may be performed substantially simultaneously or in an order opposite to that described. Further, the same reference numerals denote the same components.

[0104] When a component is referred to as being "on" or "above" another component, "connected to" or "coupled to" another component, the component may be directly on the other component, directly connected to or directly coupled to the other component, or there may be an intermediate component. However, when a component is referred to as being "directly on" another component, "directly connected to" or "directly coupled to" another component, there is no intermediate component. For this reason, the term "connected" may refer to a physical connection, an electrical connection, etc., and may or may not have an intermediate component.

[0105] For descriptive purposes, the present disclosure may use spatial relative terms such as "under", "below", "beneath", "lower", "above", "upper", "on", "higher", and "side (e.g., in "sidewall")" to describe the relationship of one component to another (other) component as shown in the figures. In addition to the orientation depicted in the figures, the spatial relative terms are also intended to encompass different orientations of the device during use, operation, and / or manufacturing. For example, if the device in the figures is flipped, a component described as "under" or "beneath" another component or feature will then be positioned "above" the other component or feature. Thus, the exemplary term "under" can encompass both the "above" and "below" orientations. In addition, the device may be otherwise positioned (e.g., rotated 90 degrees or at other orientations), and accordingly, the spatial relative descriptors used herein are to be interpreted.

[0106] The terms used herein are for the purpose of describing particular embodiments and are not intended to be limiting. As used herein, unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" are also intended to include the plural forms. In addition, when the terms "comprise" and / or "include" and their variants are used in this specification, it is stated that the stated features, integers, steps, operations, components, assemblies, and / or groups thereof are present, but one or more other features, integers, steps, operations, components, assemblies, and / or groups thereof are not excluded. It should also be noted that, as used herein, the terms "substantially", "about", and other similar terms are used as approximate terms and not as terms of degree, and thus are used to account for the inherent deviations of measured, calculated, and / or provided values that would be recognized by a person of ordinary skill in the art.

[0107] Figure 1 is a schematic circuit diagram of a battery protection device according to an embodiment of the present disclosure. Figure 2 is a schematic circuit diagram of a battery protection device according to another embodiment of the present disclosure. Figure 3 is a schematic circuit diagram of a battery protection device according to another embodiment of the present disclosure. Figure 4 is a schematic circuit diagram of a battery protection device according to another embodiment of the present disclosure. Figure 5 is a schematic circuit diagram of a battery protection device according to another embodiment of the present disclosure.

[0108] According to an embodiment of the present disclosure, as Figure 1 shown, the battery protection device includes: a battery protector 100, and the battery protector 100 includes:

[0109] The first switch unit 101 is connected between the positive electrode of the battery cell 10 of the battery device and the positive electrode of the battery device;

[0110] The first voltage acquisition unit 102 acquires the positive electrode voltage of the battery cell 10;

[0111] The first logic processor 103 is respectively connected to the first voltage acquisition unit 102 and the first switch unit 101. When the positive electrode voltage of the battery cell 10 acquired by the first voltage acquisition unit 102 is outside the first threshold voltage range, the first logic processor 103 outputs a first control signal, and the first switch unit 101 is turned off based on the first control signal.

[0112] The first threshold voltage range can be a positive voltage threshold range or a negative voltage threshold range.

[0113] Among them, the first logic processor 103 can be a processing circuit with fixed processing logic, and it can be a part of the integrated circuit in the chip.

[0114] In this embodiment, by setting the first switch unit 101, when the positive electrode voltage of the battery cell 10 is too large, the first switch unit 101 is turned off to cut off the path between the battery cell 10 and the load or charger of the battery device. The battery protection device of the present disclosure can be applied to the mobile phone battery device, and can also be applied to the battery devices of electric vehicles, electric bicycles, etc.

[0115] The battery protector 100 of this embodiment can be in the form of a semiconductor chip.

[0116] The battery protection device of this embodiment can meet the situation where the battery cell 10 is a single battery and the power is less than 30W.

[0117] For the battery protection device of the above embodiment, preferably, as Figure 1 shown, the battery protector 100 further includes a first control unit 104, and the first control unit 104 is connected between the first switch unit 101 and the first logic processor 103.

[0118] For the battery protection device of each of the above embodiments, preferably, when the positive electrode voltage of the battery cell 10 acquired by the first voltage acquisition unit 102 is outside the first threshold voltage range, the first logic processor 103 generates a first control signal, and the first control unit 104 turns off the first switch unit 101 based on the first control signal.

[0119] For the battery protection device of the above embodiments, preferably, the first voltage acquisition unit 102 includes a first comparator. When the positive electrode voltage of the battery cell 10 acquired by the first voltage acquisition unit 102 is outside the first threshold voltage range, the first voltage acquisition unit 102 outputs a first comparison signal to the first logic processor 103, and the first logic processor 103 generates a first control signal based on the first comparison signal.

[0120] For the battery protection device of the above embodiments, preferably, the battery protector 100 further includes a second voltage acquisition unit 106. The second voltage acquisition unit 106 acquires the positive electrode voltage of the battery device. When the positive electrode voltage of the battery device acquired by the second voltage acquisition unit 106 is outside the second threshold voltage range, the first logic processor 103 outputs a second control signal, and the first switch unit 101 is turned off based on the second control signal.

[0121] The second threshold voltage range can be a positive voltage threshold range or a negative voltage threshold range.

[0122] Wherein, the second voltage acquisition unit 106 may include a second comparator. When the positive electrode voltage of the battery device acquired by the second voltage acquisition unit 106 is outside the second threshold voltage range, the second voltage acquisition unit 106 outputs a second comparison signal to the first logic processor 103, and the first logic processor 103 generates a second control signal to the first control unit 104 based on the second comparison signal.

[0123] The battery protector 100 determines whether a load or a charging device is connected to the battery device based on the positive electrode voltage of the battery device acquired by the second voltage acquisition unit.

[0124] Wherein, the battery protector 100 determines whether to turn off the first switch unit 101 or turn on the first switch unit 101 based on whether a load or a charging device is connected to the battery device.

[0125] For example, when a load or a charging device is connected to the battery device and the positive electrode voltage of the battery device is within the second threshold range, if the first switch unit 101 is currently in the off state, the battery protector 100 generates a control signal to control the first switch unit 101 to resume the on state.

[0126] Preferably, the second voltage acquisition unit 106 includes a comparator and a current source.

[0127] As Figure 1 shown, the second voltage acquisition unit 106 includes a comparator and a current source. Based on this current source, the battery protector 100 can obtain the positive electrode voltage value of the battery device, thereby determining whether a load or a charging device is connected to the battery device.

[0128] For the battery protection device of each of the above embodiments, preferably, the battery protector 100 obtains the voltage difference between the voltage collected by the first voltage acquisition unit 102 and the voltage collected by the second voltage acquisition unit 106. When the voltage difference is outside the threshold voltage difference range, the battery protector 100 generates a control signal to turn off the first switch unit 101.

[0129] Among them, the threshold voltage difference range is a positive and negative voltage difference range, such as -0.3V to +1V. Those skilled in the art can set and adjust the threshold voltage difference range.

[0130] For the battery protection device of the above embodiment, preferably, the battery protector 100 further includes a first current acquisition unit 107. The first current acquisition unit 107 is used to acquire the drive current of the first control unit 104. When the drive current is outside the drive current threshold range, the first logic processor 103 stops outputting a control signal to the first control unit 104.

[0131] Preferably, the battery protector 100 further includes a first current acquisition unit 107. The first current acquisition unit 107 is used to acquire the drive current of the first control unit 104. When the drive current is outside the drive current threshold range, the battery protector 100 generates record information and / or generates an alarm signal.

[0132] For example, if the first control unit 104 outputs a control signal to the first switch unit 101, but does not output it with a normal drive current within the drive current threshold range, or does not output it with a normal drive voltage, the battery protector 100 will generate record information, and more preferably, generate an alarm signal.

[0133] For the battery protection device of the above embodiment, preferably, the first current acquisition unit 107 includes a third comparator.

[0134] Among them, when the drive current is outside the drive current threshold range, the first current acquisition unit 107 outputs a third comparison signal, and the first logic processor 103 stops outputting a control signal to the first control unit 104 based on the third comparison signal.

[0135] The second threshold current range can be a positive current threshold range or a negative current threshold range.

[0136] Among them, the first control unit 104 can be a control signal line or other forms.

[0137] For the battery protection device of the above embodiments, preferably, the battery protector 100 further includes a second current acquisition unit 105. The second current acquisition unit 105 acquires the current in the circuit between the first switch unit 101 and the positive electrode of the battery device. When the current acquired by the second current acquisition unit 105 is outside the second threshold current range, the first logic processor 103 outputs a fourth control signal, and the first switch unit 101 is turned off based on the fourth control signal.

[0138] Wherein, the second current acquisition unit 105 may include a fourth comparator. When the current acquired by the second current acquisition unit 105 is outside the second threshold current range, the second current acquisition unit 105 outputs a fourth comparison signal to the first logic processor 103, and the first logic processor 103 generates a fourth control signal to the first control unit 104 based on the fourth comparison signal.

[0139] For the battery protection device of the above embodiments, preferably, the battery protector 100 further includes a first temperature acquisition unit 108. The first temperature acquisition unit 108 acquires the temperature of the first switch unit 101 or the temperature of the area adjacent to the first switch unit 101. When the temperature acquired by the first temperature acquisition unit 108 is greater than or greater than or equal to the threshold temperature, the first logic processor 103 outputs a fifth control signal, and the first switch unit 101 is turned off based on the fifth control signal.

[0140] Since the first temperature acquisition unit 108 transmits the acquired temperature signal to the first logic processor 103, when the temperature acquired by the first temperature acquisition unit 108 is greater than or greater than or equal to the threshold temperature, the first logic processor 103 generates a fifth control signal to the first control unit 104.

[0141] For the battery protection device of the above embodiments, preferably, the first switch unit 101 is a field effect transistor.

[0142] The first switch unit 101 is preferably a MOSFET, and the first control unit 104 described above is connected between the gate of the MOSFET and the first logic processor 103.

[0143] Wherein, the first switch unit 101 is a single MOSFET or a combination of multiple MOSFETs.

[0144] Since the battery device may face situations such as reverse connection of the charging device, preferably, the first switch unit 101 of the present disclosure needs to be able to withstand sufficient positive and negative voltage withstand, and the first switch unit 101 preferably has a bidirectional blocking ability.

[0145] For the battery protection device of the above embodiments, preferably, the battery protector 100 further includes a filter circuit 110, and the first voltage acquisition unit 102 acquires the positive electrode voltage of the battery cell 10 after being filtered by the filter circuit 110.

[0146] Among them, the filter circuit can be an RC filter circuit.

[0147] The battery cell 10 described above may include one or more than two battery units.

[0148] Figure 2 It is a schematic circuit diagram of a battery protection device according to another preferred embodiment of the present disclosure.

[0149] As Figure 2 shown, based on the battery protection devices in the above various embodiments, it further includes:

[0150] A second switching device 200, the second switching device 200 is connected between the battery protector 100 and the positive electrode of the battery device, and the second switching device 200 includes a second switching part 201;

[0151] A first voltage detection part 301, the first voltage detection part 301 detects the voltage between the battery protector 100 and the second switching device 200; and,

[0152] A second logic processor 300, when the voltage detected by the first voltage detection part 301 is outside the voltage threshold range, the second logic processor 300 generates a control signal to control the second switching device 200 to turn off.

[0153] Among them, the second logic processor 300 can be a software-based processor, such as a single-chip microcomputer, etc.

[0154] As Figure 2 shown, for the battery protection device of the above embodiment, preferably, it further includes a second control part 302, and the second control part 302 is connected between the second switching part 201 and the second logic processor 300.

[0155] As Figure 2 shown, for the battery protection device of the above embodiment, preferably, when the voltage detected by the first voltage detection part 301 is outside the voltage threshold range, the second logic processor 300 generates a control signal, and the second control part 302 turns off the second switching part 201 based on the control signal.

[0156] As Figure 2 shown, for the battery protection device of the above embodiment, preferably, it further includes a second voltage detection part 304, the second voltage detection part 304 detects the positive electrode voltage of the battery device, and when the positive electrode voltage of the battery device collected by the second voltage detection part 304 is greater than the threshold voltage, the second logic processor 300 outputs a control signal to turn off the second switching part 201.

[0157] Preferably, the second logic processor 300 obtains the voltage difference between the voltage detected by the first voltage detection unit 301 and the voltage detected by the second voltage detection unit 304. When the voltage difference is outside the threshold voltage difference range, the second logic processor 300 generates a control signal to turn off the second switch unit 201.

[0158] Among them, the threshold voltage difference range is the positive and negative voltage difference range, and those skilled in the art can set and adjust the threshold voltage difference range.

[0159] This embodiment can achieve that when the second switch unit 201 (such as a MOSFET) is turned on, it can avoid the failure caused by the excessive internal resistance (RDSON) or current of the second switch unit 201 resulting in an excessive voltage difference across the MOSFET.

[0160] Among them, the first voltage detection unit 301 and the second voltage detection unit 304 can be detection lines.

[0161] As Figure 2 shown, for the battery protection device of the above embodiment, preferably, it further includes a current detection unit 303. The current detection unit 303 detects the current in the circuit between the second switch unit 201 and the positive electrode of the battery device. When the current detected by the current detection unit 303 is greater than the threshold current, the second logic processor 300 outputs a control signal to turn off the second switch unit 201.

[0162] As Figure 2 shown, for the battery protection device of the above embodiment, preferably, the second switch device 200 further includes a second temperature acquisition unit 208. The second temperature acquisition unit 208 acquires the temperature of the second switch unit 201 or the temperature of the area adjacent to the second switch unit 201. When the temperature acquired by the second temperature acquisition unit 208 is greater than or greater than or equal to the threshold temperature, the second logic processor 300 outputs a control signal to turn off the second switch unit 201.

[0163] As Figure 2 shown, for the battery protection device of the above embodiment, preferably, the second switch unit 201 is a field effect transistor.

[0164] Among them, the second switch unit 201 is a single MOSFET or a combination of multiple MOSFETs.

[0165] Since the battery device may face situations such as reverse connection of the charging device, preferably, the second switch unit 201 of the present disclosure also needs to be able to withstand sufficient positive and negative voltage withstand, and preferably, the second switch unit 201 has bidirectional blocking ability.

[0166] As Figure 2As shown, for the battery protection device of the above-described embodiment, preferably, the battery protector 100 further includes a buffer 111. The buffer 111 transmits the positive voltage of the battery cell 10 to the second logic processor 300 at a set proportional voltage value. The second logic processor 300 can generate a control signal based on the voltage value transmitted by the buffer 111 to control the second switching unit 201.

[0167] The set ratio described above can be 1:1, 1:2, etc.

[0168] As Figure 2 shown, for the battery protection device of the above-described embodiment, preferably, the first logic processor 103 is connected to the second logic processor 300 via a control signal line 109, such that the control signal generated by the second logic processor 300 can be transmitted to the first logic processor 103, and / or such that the control signal generated by the first logic processor 103 can be transmitted to the second logic processor 300.

[0169] For the battery protection device of the present disclosure, those skilled in the art can set and adjust the above-described threshold voltage, threshold temperature, etc. based on the power of the battery device, the number of battery cells, etc.

[0170] Among them, the second switching device 200 in this embodiment can be a separate chip or a part of a chip.

[0171] According to another preferred embodiment of the battery protection device of the present disclosure, as Figure 3 shown, it includes:

[0172] At least two second switching devices 200. At least two switching devices 200 are connected in series between the positive electrode of the battery cell 10 of the battery device and the positive electrode of the battery device. The second switching device 200 includes a second switching unit 201; and,

[0173] A battery protector 100, the battery protector 100 includes:

[0174] A first voltage acquisition unit 102, the first voltage acquisition unit 102 acquires the positive voltage of the battery cell 10;

[0175] A first logic processor 103, the first logic processor 103 is respectively connected to the first voltage acquisition unit 102 and the second switching unit 201 of the second switching device 200 adjacent to the battery cell 10. When the positive voltage of the battery cell 10 acquired by the first voltage acquisition unit 102 is outside the first threshold voltage range, the first logic processor 103 outputs a first control signal, and the second switching unit 201 is turned off based on the first control signal.

[0176] As Figure 3As shown, for the battery protection device of the above embodiments, preferably, the battery protector 100 further includes a first control unit 104, and the first control unit 104 is connected between the second switch unit 201 of the second switch device 200 adjacent to the battery cell 10 and the first logic processor 103.

[0177] As Figure 3 shown, for the battery protection device of the above respective embodiments, preferably, when the positive electrode voltage of the battery cell 10 collected by the first voltage acquisition unit 102 is outside the first threshold voltage range, the first logic processor 103 generates a first control signal, and the first control unit 104 turns off the second switch unit 201 of the second switch device 200 adjacent to the battery cell 10 based on the first control signal.

[0178] As Figure 3 shown, for the battery protection device of the above respective embodiments, preferably, the first voltage acquisition unit 102 includes a first comparator. When the positive electrode voltage of the battery cell 10 collected by the first voltage acquisition unit 102 is outside the first threshold voltage range, the first voltage acquisition unit 102 outputs a first comparison signal to the first logic processor 103, and the first logic processor 103 generates a first control signal based on the first comparison signal.

[0179] As Figure 3 shown, for the battery protection device of the above respective embodiments, preferably, the battery protector 100 further includes a second voltage acquisition unit 106. The second voltage acquisition unit 106 acquires the positive electrode voltage of the battery device. When the positive electrode voltage of the battery device acquired by the second voltage acquisition unit 106 is outside the second threshold voltage range, the first logic processor 103 outputs a second control signal, and the second switch unit 201 of the second switch device 200 adjacent to the battery cell 10 is turned off based on the second control signal.

[0180] As Figure 3 shown, for the battery protection device of the above respective embodiments, preferably, the battery protector 100 further includes a first current acquisition unit 107. The first current acquisition unit 107 is used to acquire the drive current of the second switch unit 201 of the second switch device 200 adjacent to the battery cell 10. When the drive current is outside the drive current threshold range, the first logic processor 103 stops outputting a control signal to the second switch unit 201 of the second switch device 200 adjacent to the battery cell 10.

[0181] As Figure 3 shown, for the battery protection device of the above respective embodiments, preferably, the first current acquisition unit 107 includes a third comparator.

[0182] As Figure 3As shown, for the battery protection devices of the above various embodiments, preferably, the battery protector 100 further includes a second current acquisition unit 105. The second current acquisition unit 105 acquires the current in the circuit between the second switching unit 201 of the second switching device 200 adjacent to the battery cell 10 and the positive electrode of the battery device. When the current acquired by the second current acquisition unit 105 is outside the second threshold current range, the first logic processor 103 outputs a fourth control signal, and the second switching unit 201 of the second switching device 200 adjacent to the battery cell 10 is turned off based on the fourth control signal.

[0183] As Figure 3 shown, for the battery protection devices of the above various embodiments, preferably, the second switching device 200 further includes a second temperature acquisition unit 208. The second temperature acquisition unit 208 acquires the temperature of the second switching unit 201 of the second switching device 200 adjacent to the battery cell 10, or acquires the temperature of the area where the second switching unit 201 of the second switching device 200 adjacent to the battery cell 10 is located. When the temperature acquired by the second temperature acquisition unit 208 is greater than or greater than or equal to the threshold temperature, the first logic processor 103 outputs a fifth control signal, and the second switching unit 201 of the second switching device 200 adjacent to the battery cell 10 is turned off based on the fifth control signal.

[0184] As Figure 3 shown, for the battery protection devices of the above various embodiments, preferably, it further includes:

[0185] a first voltage detection unit 301 that detects the voltage between two second switching devices 200; and,

[0186] a second logic processor 300 that generates a control signal to control the second switching device 200 adjacent to the positive electrode of the battery device to turn off when the voltage detected by the first voltage detection unit 301 is outside the voltage threshold range.

[0187] As Figure 3 shown, for the battery protection devices of the above various embodiments, preferably, it further includes a second control unit 302, and the second control unit 302 is connected between the second switching unit 201 of the second switching device 200 adjacent to the positive electrode of the battery device and the second logic processor 300.

[0188] As Figure 3 shown, for the battery protection devices of the above various embodiments, preferably, when the voltage detected by the first voltage detection unit 301 is outside the voltage threshold range, the second logic processor 300 generates a control signal, and the second control unit 302 turns off the second switching unit 201 of the second switching device 200 adjacent to the positive electrode of the battery device based on the control signal.

[0189] AsFigure 3 As shown, for the battery protection devices of the above-described various embodiments, preferably, it further includes a second voltage detection unit 304. The second voltage detection unit 304 detects the positive voltage of the battery device. When the positive voltage of the battery device detected by the second voltage detection unit 304 is greater than the threshold voltage, the second logic processor 300 outputs a control signal to turn off the second switch portion 201 of the second switch device 200 adjacent to the positive electrode of the battery device.

[0190] As Figure 3 shown, for the battery protection devices of the above-described various embodiments, preferably, it further includes a current detection unit 303. The current detection unit 303 detects the current in the circuit between the second switch device 200 adjacent to the positive electrode of the battery device and the positive electrode of the battery device. When the current detected by the current detection unit 303 is greater than the threshold current, the second logic processor 300 outputs a control signal to turn off the second switch portion 201 of the second switch device 200 adjacent to the positive electrode of the battery device.

[0191] As Figure 3 shown, for the battery protection devices of the above-described various embodiments, preferably, the second switch device 200 further includes a second temperature acquisition unit 208. The second temperature acquisition unit 208 acquires the temperature of the second switch portion 201 or the temperature of the area adjacent to the second switch portion 201. When the temperature acquired by the second temperature acquisition unit 208 of the second switch device 200 adjacent to the positive electrode of the battery device is greater than or greater than or equal to the threshold temperature, the second logic processor 300 outputs a control signal to turn off the second switch portion 201 of the second switch device 200 adjacent to the positive electrode of the battery device.

[0192] As Figure 3 shown, for the battery protection devices of the above-described various embodiments, preferably, the battery protector 100 further includes a buffer 111. The buffer 111 transmits the positive voltage of the battery cell 10 to the second logic processor 300 at a set proportional voltage value. The second logic processor 300 can generate a control signal based on the voltage value transmitted by the buffer 111 to control the second switch portion 201 of the second switch device 200 adjacent to the positive electrode of the battery device.

[0193] The set ratio described above can be 1:1, 1:2, etc.

[0194] According to a preferred embodiment of the present disclosure, the second logic processor 300 obtains the voltage difference between the voltage transmitted by the buffer 111 and the voltage detected by the first voltage detection unit 301. When the voltage difference is outside the threshold voltage difference range, the second logic processor 300 generates a control signal to turn off the second switch portion 201.

[0195] Among them, the threshold voltage difference range is the positive and negative voltage difference range, and those skilled in the art can set and adjust the threshold voltage difference range.

[0196] According to a preferred embodiment of the present disclosure, the second logic processor 300 obtains the voltage difference between the voltage transmitted by the buffer 111 and the voltage detected by the second voltage detection unit 304. When the voltage difference is outside the threshold voltage difference range, the second logic processor 300 generates a control signal to turn off the second switch unit 201.

[0197] Among them, the threshold voltage difference range is the positive and negative voltage difference range, and those skilled in the art can set and adjust the threshold voltage difference range.

[0198] This embodiment can avoid excessive impedance in the circuits of the first switch unit 101 and the second switch unit 201.

[0199] According to a preferred embodiment of the present disclosure, the second logic processor 300 obtains the loop impedance and the impedances of each switch unit (101, 201) based on the voltage difference between the voltage transmitted by the buffer 111 and the voltage detected by the first voltage detection unit 301, the voltage difference between the voltage transmitted by the buffer 111 and the voltage detected by the second voltage detection unit 304, the voltage difference between the voltage detected by the first voltage detection unit 301 and the voltage detected by the second voltage detection unit 304, the current collected by the second current collection unit 105, and the current collected by the current detection unit 303.

[0200] As Figure 3 shown, for the battery protection device of each of the above embodiments, preferably, the first logic processor 103 is connected to the second logic processor 300 via the control signal line 109, so that the control signal generated by the second logic processor 300 can be transmitted to the first logic processor 103, and / or so that the control signal generated by the first logic processor 103 can be transmitted to the second logic processor 300.

[0201] Figure 4 is a schematic circuit structure diagram of a battery protection device according to another preferred embodiment of the present disclosure.

[0202] As Figure 4 shown, on the basis of the battery protection device shown in Figure 3 each second switch device 200 is connected in parallel with another second switch device 200, and the two newly added second switch devices 200 are connected in series between the battery cell 10 and the positive electrode of the battery device.

[0203] The battery protection device of this embodiment has higher reliability and can meet the situation where the battery cell 10 is a single battery and the power is greater than 30W.

[0204] Figure 5 It is a schematic circuit diagram of a battery protection device according to another preferred embodiment of the present disclosure.

[0205] As Figure 5 shown, on the basis of the battery protection device shown in Figure 2 , an additional battery protector 100 is connected in parallel with the battery protector 100, a second switch device 200 is connected in parallel with an additional second switch device 200, and the additional battery protector 100 and the additional second switch device 200 are connected in series between the battery cell 10 and the positive electrode of the battery device.

[0206] The battery protection device of this embodiment has higher reliability and can meet the situation where the battery cell 10 is a single battery and the power is greater than 30W.

[0207] The present disclosure also provides a battery device. The battery device according to at least one embodiment of the present disclosure includes: the battery protection device of any one of the above embodiments.

[0208] In the description of this specification, the description with reference to terms such as "one embodiment / way", "some embodiments / ways", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of the present disclosure. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments / ways or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments / ways or examples described in this specification and the features of different embodiments / ways or examples.

[0209] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0210] Those skilled in the art should understand that the above embodiments are only for clearly explaining the present disclosure and are not intended to limit the scope of the present disclosure. For those skilled in the art, other changes or modifications can be made on the basis of the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

Claims

1. A battery protection device, characterized in that, Comprising: A battery protector, the battery protector comprising: A first switch unit connected between the positive electrode of the battery cell of the battery device and the positive electrode of the battery device; A first voltage acquisition unit for acquiring the positive electrode voltage of the battery cell; A first logic processor connected to the first voltage acquisition unit. When the positive electrode voltage of the battery cell acquired by the first voltage acquisition unit is outside the first threshold voltage range, the first logic processor outputs a first control signal; A first control unit connected between the first switch unit and the first logic processor, and shutting off the first switch unit based on the first control signal; A first current acquisition unit for acquiring the drive current of the first switch unit. When the drive current is outside the drive current threshold range, the first logic processor stops outputting a control signal to the first control unit; A second voltage acquisition unit for acquiring the positive electrode voltage of the battery device. When the positive electrode voltage of the battery device acquired by the second voltage acquisition unit is outside the second threshold voltage range, the first logic processor outputs a second control signal, and the first control unit shuts off the first switch unit based on the second control signal. The battery protector obtains the voltage difference between the voltage acquired by the first voltage acquisition unit and the voltage acquired by the second voltage acquisition unit. When the voltage difference is outside the threshold voltage difference range, the battery protector generates a control signal and outputs it to the first control unit to shut off the first switch unit; A second current acquisition unit for acquiring the current in the circuit between the first switch unit and the positive electrode of the battery device. When the current acquired by the second current acquisition unit is outside the second threshold current range, the first logic processor outputs a fourth control signal, and the first control unit shuts off the first switch unit based on the fourth control signal; A second switch device connected between the battery protector and the positive electrode of the battery device, the second switch device comprising a second switch unit; A first voltage detection unit for detecting the voltage between the battery protector and the second switch device; and A second logic processor. When the voltage detected by the first voltage detection unit is outside the voltage threshold range, the second logic processor generates a control signal to control the second switch device to shut off.

2. The battery protection device according to claim 1, wherein The first voltage acquisition unit includes a first comparator. When the positive electrode voltage of the battery cell acquired by the first voltage acquisition unit is outside the first threshold voltage range, the first voltage acquisition unit outputs a first comparison signal to the first logic processor, and the first logic processor generates the first control signal based on the first comparison signal.

3. The battery protection device according to claim 1, characterized in that, The battery protector determines whether a load or a charging device is connected to the battery device based on the positive electrode voltage of the battery device acquired by the second voltage acquisition unit.

4. The battery protection device according to claim 1, wherein, The second voltage acquisition unit includes a comparator and a current source.

5. The battery protection device according to claim 1, characterized in that When the drive current is outside the drive current threshold range, the battery protector generates record information and / or generates an alarm signal.

6. The battery protection device according to claim 1, wherein The first current acquisition unit includes a third comparator.

7. The battery protection device according to claim 1, characterized in that, The battery protector further includes a first temperature acquisition unit, which acquires the temperature of the first switching unit or the temperature of the area adjacent to the first switching unit. When the temperature acquired by the first temperature acquisition unit is greater than or greater than or equal to the threshold temperature, the first logic processor outputs a fifth control signal, and the first control unit turns off the first switching unit based on the fifth control signal.

8. The battery protection device according to claim 1, characterized in that, The first switching unit is a field effect transistor.

9. The battery protection device according to claim 1, characterized in that The first switching unit is a single MOSFET or a combination of multiple MOSFETs.

10. The battery protection device according to claim 1, characterized in that, The battery protector further includes a filter circuit, and the first voltage acquisition unit acquires the positive electrode voltage of the battery cell after being filtered by the filter circuit.

11. The battery protection device according to claim 1, characterized in that The battery cell includes one or two or more battery units.

12. The battery protection device according to claim 1, characterized in that, It further includes a second control unit, which is connected between the second switching unit and the second logic processor.

13. The battery protection device according to claim 12, characterized in that, When the voltage detected by the first voltage detection unit is outside the voltage threshold range, the second logic processor generates a control signal, and the second control unit turns off the second switching unit based on the control signal.

14. The battery protection device according to claim 13, characterized in that, It further includes a second voltage detection unit, which detects the positive electrode voltage of the battery device. When the positive electrode voltage of the battery device acquired by the second voltage detection unit is greater than the threshold voltage, the second logic processor outputs a control signal to turn off the second switching unit.

15. The battery protection device according to claim 14, wherein The second logic processor obtains the voltage difference between the voltage detected by the first voltage detection unit and the voltage detected by the second voltage detection unit. When the voltage difference is outside the threshold voltage difference range, the second logic processor generates a control signal to turn off the second switching unit.

16. The battery protection device according to claim 1, wherein, It further includes a current detection unit, which detects the current in the circuit between the second switching unit and the positive electrode of the battery device. When the current detected by the current detection unit is greater than the threshold current, the second logic processor outputs a control signal to turn off the second switching unit.

17. The battery protection device according to claim 1, characterized in that, The second switching device further includes a second temperature acquisition unit, which acquires the temperature of the second switching unit or the temperature of the area adjacent to the second switching unit. When the temperature acquired by the second temperature acquisition unit is greater than or greater than or equal to the threshold temperature, the second logic processor outputs a control signal to turn off the second switching unit.

18. The battery protection device according to claim 1, wherein, The second switching unit is a field effect transistor.

19. The battery protection device according to claim 18, characterized in that, The second switching unit is a single MOSFET or a combination of multiple MOSFETs.

20. The battery protection device according to claim 1, characterized in that, The battery protector further includes a buffer, which transmits the positive electrode voltage of the battery cell to the second logic processor at a set proportional voltage value, and the second logic processor can generate a control signal based on the voltage value transmitted by the buffer to control the second switching unit.

21. The battery protection device according to claim 1, wherein, The first logic processor and the second logic processor are connected via a control signal line, so that the control signal generated by the second logic processor can be transmitted to the first logic processor, and / or so that the control signal generated by the first logic processor can be transmitted to the second logic processor.

22. A battery protection device, characterized in that, Including: At least two second switching devices, at least two switching devices being connected in series between the positive electrode of the battery cell of the battery device and the positive electrode of the battery device, the second switching device including a second switching portion; And A battery protector, the battery protector including: A first voltage acquisition portion that acquires the positive electrode voltage of the battery cell; A first logic processor connected to the first voltage acquisition portion, when the positive electrode voltage of the battery cell acquired by the first voltage acquisition portion is outside a first threshold voltage range, the first logic processor outputs a first control signal; A first control portion connected between the second switching portion of the second switching device adjacent to the battery cell and the first logic processor, and turning off the second switching portion of the second switching device adjacent to the battery cell based on the first control signal; A first current acquisition portion that is used to acquire the drive current of the second switching portion of the second switching device adjacent to the battery cell, when the drive current is outside a drive current threshold range, the first logic processor stops outputting a control signal to the first control portion; A second voltage acquisition portion that acquires the positive electrode voltage of the battery device, when the positive electrode voltage of the battery device acquired by the second voltage acquisition portion is outside a second threshold voltage range, the first logic processor outputs a second control signal, and the first control portion turns off the second switching portion of the second switching device adjacent to the battery cell based on the second control signal; A second current acquisition portion that acquires the current in the circuit between the second switching portion of the second switching device adjacent to the battery cell and the positive electrode of the battery device, when the current acquired by the second current acquisition portion is outside a second threshold current range, the first logic processor outputs a fourth control signal, and the first control portion turns off the second switching portion of the second switching device adjacent to the battery cell based on the fourth control signal; A first voltage detection portion that detects the voltage between the two second switching devices; and A second logic processor, when the voltage detected by the first voltage detection portion is outside a voltage threshold range, the second logic processor generates a control signal to control the second switching device adjacent to the positive electrode of the battery device to turn off.

23. The battery protection device according to claim 22, characterized in that, The first voltage acquisition portion includes a first comparator, when the positive electrode voltage of the battery cell acquired by the first voltage acquisition portion is outside a first threshold voltage range, the first voltage acquisition portion outputs a first comparison signal to the first logic processor, and the first logic processor generates the first control signal based on the first comparison signal.

24. The battery protection device according to claim 22, wherein, The first current acquisition portion includes a third comparator.

25. The battery protection device according to claim 22, characterized in that, The second switching device further includes a second temperature acquisition unit, which acquires the temperature of the second switching part of the second switching device adjacent to the battery cell, or acquires the temperature of the area where the second switching part of the second switching device adjacent to the battery cell is located. When the temperature acquired by the second temperature acquisition unit is greater than or greater than or equal to the threshold temperature, the first logic processor outputs a fifth control signal, and the first control unit turns off the second switching part of the second switching device adjacent to the battery cell based on the fifth control signal.

26. The battery protection device according to claim 22, characterized in that, It further includes a second control unit, which is connected between the second switching part of the second switching device adjacent to the positive electrode of the battery device and the second logic processor.

27. The battery protection device according to claim 26, characterized in that, When the voltage detected by the first voltage detection unit is outside the voltage threshold range, the second logic processor generates a control signal, and the second control unit turns off the second switching part of the second switching device adjacent to the positive electrode of the battery device based on the control signal.

28. The battery protection device according to claim 22, wherein It further includes a second voltage detection unit, which detects the positive electrode voltage of the battery device. When the positive electrode voltage of the battery device detected by the second voltage detection unit is greater than the threshold voltage, the second logic processor outputs a control signal to turn off the second switching part of the second switching device adjacent to the positive electrode of the battery device.

29. The battery protection device according to claim 22, characterized in that, It further includes a current detection unit, which detects the current in the circuit between the second switching device adjacent to the positive electrode of the battery device and the positive electrode of the battery device. When the current detected by the current detection unit is greater than the threshold current, the second logic processor outputs a control signal to turn off the second switching part of the second switching device adjacent to the positive electrode of the battery device.

30. The battery protection device according to claim 22, wherein, The second switching device further includes a second temperature acquisition unit, which acquires the temperature of the second switching part, or acquires the temperature of the area adjacent to the second switching part. When the temperature acquired by the second temperature acquisition unit of the second switching device adjacent to the positive electrode of the battery device is greater than or greater than or equal to the threshold temperature, the second logic processor outputs a control signal to turn off the second switching part of the second switching device adjacent to the positive electrode of the battery device.

31. The battery protection device according to claim 28, characterized in that, The battery protector further includes a buffer, which transmits the positive electrode voltage of the battery cell to the second logic processor at a set proportional voltage value. The second logic processor can generate a control signal based on the voltage value transmitted by the buffer to control the second switching part of the second switching device adjacent to the positive electrode of the battery device.

32. The battery protection device according to claim 31, wherein The second logic processor obtains the voltage difference between the voltage transmitted by the buffer and the voltage detected by the first voltage detection unit. When the voltage difference is outside the threshold voltage difference range, the second logic processor generates a control signal to turn off the second switching part.

33. The battery protection device according to claim 31, characterized in that, The second logic processor obtains the voltage difference between the voltage transmitted by the buffer and the voltage detected by the second voltage detection unit. When the voltage difference is outside the threshold voltage difference range, the second logic processor generates a control signal to turn off the second switching part.

34. The battery protection device according to claim 31, wherein The second logic processor obtains the loop impedance and the impedances of each switching unit based on the voltage difference between the voltage transmitted by the buffer and the voltage detected by the first voltage detection unit, the voltage difference between the voltage transmitted by the buffer and the voltage detected by the second voltage detection unit, the voltage difference between the voltage detected by the first voltage detection unit and the voltage detected by the second voltage detection unit, the current collected by the second current collection unit, and the current collected by the current detection unit.

35. The battery protection device according to claim 22, characterized in that, The first logic processor and the second logic processor are connected via a control signal line, such that the control signal generated by the second logic processor can be transmitted to the first logic processor, and / or such that the control signal generated by the first logic processor can be transmitted to the second logic processor.

36. A battery device, characterized in that, Comprising: The battery protection device according to any one of claims 1 to 35.

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