CN218919057U - Battery preheating device and electronic equipment - Google Patents
Battery preheating device and electronic equipment Download PDFInfo
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- CN218919057U CN218919057U CN202222599192.5U CN202222599192U CN218919057U CN 218919057 U CN218919057 U CN 218919057U CN 202222599192 U CN202222599192 U CN 202222599192U CN 218919057 U CN218919057 U CN 218919057U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model provides a battery preheating device and electronic equipment, wherein the battery preheating device comprises a first switch unit, a second switch unit and a control unit, wherein the first end of the first switch unit is suitable for being electrically connected with a first pole of a battery and is used for being closed during preheating; the first end of the second switch unit is electrically connected with the second end of the first switch unit, and the second end of the second switch unit is suitable for being electrically connected with the second pole of the battery and used for being opened and closed at a target frequency during preheating; the control unit is electrically connected with the control end of the first switch unit and the control end of the switch tube respectively and is used for detecting the failure of the second switch unit during preheating and controlling the disconnection of the first switch unit. The battery preheating device can preheat the battery at low temperature and protect the battery during preheating.
Description
Technical Field
The present utility model relates to the field of battery technologies, and in particular, to a battery preheating device and an electronic device.
Background
With the increase of the traffic volume of life information, the performance of consumers on the electronic equipment is higher and higher, so the requirement on the charge and discharge performance of the battery is improved. At low temperatures, lithium battery kinetics become poor. If the battery is charged or discharged at a low temperature, it is necessary to ensure that the temperature of the battery satisfies the temperature requirement for normal charge and discharge. In the prior art, a technique for preheating a battery by pulse short circuit is proposed.
In the related art, when a battery is preheated by adopting a mode of setting pulse short circuit under the condition of low temperature, the condition of out-of-control pulse short circuit easily occurs, the reliability of a battery heating loop is lower, and the safety of the battery is influenced.
Disclosure of Invention
An object of the present utility model is to provide a battery preheating device, which can preheat a battery at a low temperature, protect the battery during preheating, and improve the reliability of a battery preheating circuit.
A second object of the utility model is to propose an electronic device.
In order to achieve the above object, a battery preheating device according to an embodiment of a first aspect of the present utility model includes: a first switching unit having a first end adapted to be electrically connected to a first pole of the battery for closing upon warm-up; a second switching unit having a first end electrically connected to a second end of the first switching unit, the second end adapted to be electrically connected to a second pole of the battery for switching on and off at a target frequency at the time of warm-up; and the control unit is electrically connected with the control end of the first switch unit and the control end of the switch tube respectively and is used for detecting the failure of the second switch unit during preheating and controlling the first switch unit to be disconnected.
According to the battery preheating device provided by the embodiment of the utility model, on the basis of adopting the technology of preheating the battery through pulse short circuit, by arranging the first switch unit 1, when the failure of the second switch unit is detected during preheating, the first switch unit can be timely controlled to be disconnected, and the battery preheating loop can be timely disconnected, so that the problem that the battery cannot work normally at low temperature can be solved, the preheating loop and the battery can be protected, and the reliability of the battery preheating loop is improved.
In some embodiments of the utility model, the first switching unit includes: the first end of the first switching tube is suitable for being electrically connected with the first pole of the battery, the second end of the first switching tube is electrically connected with the second switching unit, and the control end of the first switching tube is electrically connected with the control unit.
In some embodiments of the utility model, the first switching unit further comprises: the first end of the first resistor is electrically connected with the first end of the first switching tube, and the second end of the first resistor is electrically connected with the control end of the first switching tube.
In some embodiments of the utility model, the second switching unit includes: the first end of the second switching tube is electrically connected with the second end of the first switching tube, the second end of the second switching tube is suitable for being electrically connected with the second pole of the battery, and the control end of the second switching tube is electrically connected with the control unit; the first end of the second resistor is electrically connected with the second end of the second switching tube, and the second end of the second resistor is electrically connected with the control end of the second switching tube.
In some embodiments of the present utility model, the battery preheating device further includes a current acquisition circuit for acquiring a current value of a preheating loop of the battery; the control unit is also electrically connected with the current acquisition circuit and used for controlling the first switch unit to be disconnected when the current value exceeds a target current value.
In some embodiments of the utility model, the current acquisition circuit comprises: a third resistor, a first end of the third resistor being electrically connected to a second end of the second switching unit, a second end of the third resistor being adapted to be electrically connected to a second pole of the battery; a fourth resistor, wherein a first end of the fourth resistor is electrically connected with a first end of the third resistor, and a second end of the fourth resistor is electrically connected with the control unit; a fifth resistor, wherein a first end of the fifth resistor is electrically connected with a second end of the third resistor, and a second end of the fifth resistor is electrically connected with the control unit; the first end of the first capacitor is grounded, and the second end of the first capacitor is electrically connected with the second end of the fifth resistor; the first end of the second capacitor is grounded, and the second end of the second capacitor is electrically connected with the second end of the fourth resistor; and the first end of the third capacitor is electrically connected with the second end of the second capacitor and the second end of the fourth resistor, and the second end of the third capacitor is electrically connected with the second end of the first capacitor and the second end of the fifth resistor.
In some embodiments of the utility model, the battery preheating device further includes: and a fuse disposed between the first end of the first switching unit and the first pole of the battery for being opened when the current value exceeds a protection current value.
In some embodiments of the present utility model, the battery preheating device further includes a temperature acquisition circuit for acquiring a temperature value of the battery; the control unit is also electrically connected with the temperature acquisition circuit and used for controlling the first switch unit to be disconnected when the temperature value exceeds a target temperature value.
In order to achieve the above object, an electronic device according to an embodiment of a second aspect of the present utility model includes: a battery and a battery preheating device according to any of the above embodiments, the battery preheating device being electrically connected to the battery.
According to the electronic equipment provided by the embodiment of the utility model, the battery preheating device can preheat the battery through pulse short circuit, and can protect the battery in the process of preheating the battery.
In some embodiments of the utility model, the battery comprises a plurality of cells connected in series, the positive electrode of the first cell of the plurality of cells connected in series being the first pole of the battery, and the negative electrode of the tail cell of the plurality of cells connected in series being the second pole of the battery.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a block diagram of a battery preheating device according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a first switching unit, a second switching unit, and a cell temperature over time according to one embodiment of the present utility model;
fig. 3 is a schematic view of a battery preheating device according to an embodiment of the present utility model;
fig. 4 is a block diagram of an electronic device according to one embodiment of the utility model.
Reference numerals:
an electronic device 100;
a battery preheating device 10 and a battery 20;
the device comprises a first switch unit 1, a second switch unit 2, a control unit 3, a current acquisition circuit 4, a fuse 5 and a temperature acquisition circuit 6;
the first switching tube Q1, the second switching tube Q2, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the thermistor R6, the first capacitor C1, the second capacitor C2 and the third capacitor C3.
Detailed Description
Embodiments of the present utility model will be described in detail below, by way of example with reference to the accompanying drawings.
A battery preheating apparatus according to an embodiment of the present utility model is described below with reference to fig. 1 to 3.
In some embodiments of the present utility model, as shown in fig. 1, a schematic diagram of a battery preheating device according to an embodiment of the present utility model, wherein a battery preheating device 10 includes a first switching unit 1, a second switching unit 2, and a control unit 3.
The first end of the first switching unit 1 is adapted to be electrically connected to a first pole of the battery 20 for closing upon warm-up. The first pole of the battery 20 may be a positive pole of the battery 20, and the first switching unit 1 includes at least one switch or a switching tube for closing when the battery 20 is preheated. The first end of the second switching unit 2 is electrically connected to the second end of the first switching unit 1, and the second end of the second switching unit 2 is adapted to be electrically connected to the second pole of the battery 20 for switching on and off at a target frequency at the time of warm-up. The target frequency may be a target, or may be set by an operation and maintenance person according to a requirement, which is not limited herein. Alternatively, the second pole of the battery 20 may be the negative pole of the battery 20, and the second switching unit 2 may include a switching tube, so as to meet the requirement that the second switching unit 2 needs to be opened and closed at the target frequency.
In this application, alternatively, the switching transistor used in the first switching unit 1 or the second switching unit 2 may be a Metal-Oxide-Semiconductor (MOSFET) transistor, a P-Metal-Oxide-Semiconductor (PMOS) transistor, an N-Metal-Oxide-Semiconductor (NMOS) transistor, or the like, which is not limited herein.
As is clear from the above, the first switch unit 1 and the second switch unit 2 are disposed in series in the preheating circuit and electrically connected to the head and the tail of the battery 20, and therefore, the preheating circuit is open when any one of the first switch unit 1 and the second switch unit 2 is open, and the preheating circuit is closed when both the first switch unit 1 and the second switch unit 2 are closed. If the battery 20 is used in a low temperature condition, the internal resistance of the battery core is increased sharply due to the low temperature, and the battery reaches the discharge cut-off voltage quickly. In order to prevent the occurrence of the above-mentioned situation, when the preheating circuit is turned on, current flows out from the positive electrode of the battery 20 and flows back into the battery 20 from the negative electrode, and the internal resistance is reduced by preheating the battery cell with a part of energy, so that the capacity of the battery at low temperature can be effectively improved.
Considering that when the battery 20 is short-circuited, the internal temperature of the battery 20 is easily too high and even the battery 20 is damaged, the embodiment proposes to control the preheating circuit to be on-off at the target frequency by controlling the first switch unit 1 to be closed and controlling the second switch unit 2 to be on-off at the target frequency when the battery 20 is preheated, so as to provide pulse current for heating the battery 20.
Based on this, the target frequency may be set according to the warm-up demand of the battery 20 and the safety of the warm-up circuit, for example, the target frequency may be set to satisfy 80 Hz. Ltoreq.target frequency. Ltoreq.120 Hz, for example, the target frequency may be set to 80Hz or 95Hz or 100Hz or 110Hz or 120Hz or the like, and is not particularly limited herein. Preferably, the second switching unit 2 may be set to be turned off at a frequency of 100Hz, i.e., one pulse period is 10ms, the second switching unit 2 is set to be turned on for 1ms and turned off for 9ms, and the duty ratio within one pulse period is 1/10. When the preheating loop is switched on and off at the target frequency, the self-heating requirement of the battery 20 can be met, and the battery 20 cannot be damaged due to overhigh temperature of the battery 20. In addition, when the battery 20 is heated by the pulse current, the cell pressure is relatively small.
Specifically, the case where the temperatures of the first switching unit 1, the second switching unit 2, and the battery cells change with time when the battery 20 is preheated in this embodiment can be understood with reference to fig. 2, and fig. 2 is a schematic diagram showing the temperature changes with time of the first switching unit, the second switching unit, and the battery cells according to one embodiment of the present utility model. Wherein, curve A represents the temperature of the battery cell changing with time; curve B represents the time variation of the operating state of the first switching element; curve C shows the condition of the operating state of the second switching unit 2 varying with time, and after the warm-up function is turned on, the second switching unit 2 performs on-off operation at the target frequency. Wherein t0-t0' represents a pulse period, for example, one pulse period may be set to 10ms, the second switch unit 2 is set to input a high level at the time of 1ms of on time of each pulse period, and to input a low level at the time of 9ms of off time, so that the duty ratio of the second switch unit 2 is 1/10 in a whole preheating period. As shown in fig. 2, the temperature of the battery cell is relatively low at time t0, and the low-temperature preheating starting condition is satisfied, so that the internal battery preheating function is started. The low-temperature preheating start condition may be set as required, for example, the temperature of the battery 20 may be lower than the temperature required when the battery 20 performs normal charge and discharge operation, and/or when the battery 20 is used in an electronic device, the electronic device is started at a low temperature, and at this time, the battery 20 needs to be preheated.
After the low-temperature preheating function is turned on, the first switch unit 1 is turned on and the second switch unit 2 is turned on and off at the target frequency, so that a pulse current can be generated to heat the battery 20. After time t0, the temperature of the battery 20 gradually increases, for example, at time t1, it is determined that the temperature of the battery 20 satisfies the low-temperature warm-up end condition, and the first switching unit 1 and the second switching unit 2 are controlled to be turned off to disconnect the warm-up circuit.
In some embodiments, as shown in fig. 1, the control unit 3 is electrically connected to the control terminal of the first switching unit 1 and the control terminal of the first switching unit 1, respectively, and may control the first switching unit 1 to be turned off if the failure of the second switching unit 2 is detected during preheating.
It can be understood that when the current value of the preheating circuit is too large during the preheating of the battery 20, the situation that the switching tube in the second switching unit 2 is broken down and fails to perform pulse short circuit is out of control is easily caused, and at this time, the first switching unit 1 is used as a protection unit of the preheating circuit, and the control unit 3 timely controls the first switching unit 1 to turn off, and timely turns off the battery preheating circuit, so as to realize protection of the preheating circuit.
According to the battery preheating device 10 provided by the embodiment of the utility model, on the basis of adopting the technology of preheating the battery 20 through pulse short circuit, by arranging the first switch unit 1, the failure of the second switch unit 2 can be detected during preheating, the first switch unit 1 can be timely controlled to be disconnected, and the battery preheating loop can be timely disconnected, so that the problem that the battery cannot work normally at low temperature can be solved, the battery can be protected during preheating, and the reliability of the battery preheating loop can be improved.
In some embodiments of the present utility model, a battery preheating device according to an embodiment of the present utility model is understood in conjunction with fig. 1 and 3, and as shown in fig. 3, is a schematic diagram of a battery preheating device according to an embodiment of the present utility model.
The first switching unit 1 includes a first switching tube Q1 and a first resistor R1, a first end of the first switching tube Q1 is adapted to be electrically connected to a first pole of the battery 20, a second end of the first switching tube Q1 is electrically connected to the second switching unit 2, and a control end of the first switching tube Q1 is electrically connected to the control unit 3, where the first switching tube Q1 may be a PMOS (P-Metal-Oxide-Semiconductor) transistor. When the low-temperature preheating start condition is satisfied, the control unit 3 controls the first switching tube Q1 to be turned on, when the low-temperature preheating end condition is satisfied, the control unit 3 controls the first switching tube Q1 to be turned off, and when the pulse short circuit is detected to be out of control, the control unit 3 controls the first switching tube Q1 to be turned off for protection.
The first end of the first resistor R1 is electrically connected to the first end of the first switching tube Q1, and the second end of the first resistor R1 is electrically connected to the control end of the first switching tube Q1, where the resistance of the first resistor R1 can be set according to the safety requirement of preheating the battery 20, for example, 9mΩ is less than or equal to R1 and less than or equal to 11mΩ, for example, R1 can be set to 9mΩ, 9.5mΩ, 10mΩ, 11mΩ, or the like, which is not limited herein. Preferably, the first resistor R1 may be a resistor having a resistance value of 10mΩ. The first resistor R1 is configured to form a small closed loop with the first switching tube Q1 after the first switching tube Q1 is opened, so as to release the charge in the first switching tube Q1. In some embodiments, as shown in fig. 3, the second switching unit 2 includes a second switching tube Q2 and a second resistor R2.
The first end of the second switching tube Q2 is electrically connected to the second end of the first switching tube Q1, the second end of the second switching tube Q2 is adapted to be electrically connected to the second pole of the battery 20, and the control end of the second switching tube Q2 is electrically connected to the control unit 3. The second switching transistor Q2 may employ an NMOS transistor.
When the low-temperature preheating start condition is met, the control unit 3 controls the second switching tube Q2 to start working, and controls the second switching tube Q2 to be switched on and off at a target frequency, so as to realize that the pulse short-circuit current heats the battery 20 in a short-circuit loop. And, when the low-temperature preheating end condition is satisfied, the control unit 3 controls the second switching tube Q2 to be turned off.
The first end of the second resistor R2 is electrically connected to the second end of the second switching tube Q2, and the second end of the second resistor R2 is electrically connected to the control end of the second switching tube Q2, where the resistance of the second resistor R2 can be set according to the safety requirement of preheating the battery 20, for example, 9mΩ is less than or equal to R2 and less than or equal to 11mΩ, for example, R2 can be set to 9mΩ, 9.5mΩ, 10mΩ, 11mΩ, or the like, which is not limited herein. Preferably, the second resistor R2 may be a resistor having a resistance of 10mΩ. The second resistor R2 is configured to form a small closed loop with the second switching tube Q2 after the second switching tube Q2 is turned off, so as to release the charge in the second switching tube Q2.
In some embodiments of the present utility model, the battery preheating device 10 further includes a current collecting circuit, as shown in fig. 3, and the battery preheating device 10 of the present embodiment, the current collecting circuit 4 in the common battery protection plate collects the current value of the preheating circuit of the battery 20. The current value of the preheating loop is short-circuit current.
The control unit 3 is also electrically connected to the current acquisition circuit 4 for controlling the first switching unit 1 to be opened when the current value exceeds the target current value. In consideration of the fact that the battery temperature is too high and even the battery is damaged when the short-circuit current is too high, the target current value can be set according to the safety requirement of self-heating of the battery by adopting the battery short-circuit current. When the current value of the preheating loop is too large, the situation that the second switching tube Q2 is broken down or the battery 20 is damaged and the like is easy to cause out of control due to pulse short circuit is caused, at this moment, the first switching unit 1 is used as an overcurrent protection unit of the preheating loop, the control unit 3 timely controls the first switching tube Q1 to be turned off, and the battery preheating loop is timely disconnected, so that overcurrent protection of the preheating loop is realized.
In some embodiments of the present utility model, as shown in fig. 3, the current collection circuit 4 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, and a third capacitor C3. The safety requirements for preheating the battery 20 are not limited herein, and the resistance values of the third resistor R3, the fourth resistor R4, and the fifth resistor R5, and the capacitance values of the first capacitor C1, the second capacitor C2, and the third capacitor C3 are set according to the requirements. For example, 2.7mΩ.ltoreq.R3.ltoreq.3.3mΩ may be set, for example, R3 may be set to 2.7mΩ or 2.9mΩ or 3.0mΩ or 3.3mΩ, etc.; setting 90RΩ less than or equal to R4 less than or equal to 90RΩ, for example, R4 can be set to 90RΩ or 95RΩ or 100RΩ or 110RΩ, etc.; setting 90RΩ less than or equal to R5 less than or equal to 90RΩ, for example, R5 can be set to 90RΩ or 95RΩ or 100RΩ or 110RΩ, etc.; and, 0.09 uF.ltoreq.C1.ltoreq.0.11 uF, for example, C1 may be set to 0.09uF or 0.1uF or 0.11uF, etc.; setting 0.09 uF.ltoreq.C2.ltoreq.0.11 uF, for example, C2 may be set to 0.09uF or 0.1uF or 0.11uF, etc.; setting 0.09 uF.ltoreq.C3.ltoreq.0.11 uF, for example, C3 may be set to 0.09uF or 0.1uF or 0.11uF, etc.
Wherein the first end of the third resistor R3 is electrically connected to the second end of the second switching unit 2, and the second end of the third resistor R3 is adapted to be electrically connected to the second pole of the battery 20, preferably, the third resistor R3 may be a resistor having a resistance value of 3mΩ. The first end of the fourth resistor R4 is electrically connected to the first end of the third resistor R3, and the second end of the fourth resistor R4 is electrically connected to the control unit 3, and preferably, the fourth resistor R4 may be a resistor having a resistance value of 100rΩ. The first end of the fifth resistor R5 is electrically connected to the second end of the third resistor R3, and the second end of the fifth resistor R5 is electrically connected to the control unit 3, and preferably, the fifth resistor R5 may be a resistor having a resistance value of 100rΩ. The control unit 3 further collects the current value of the preheating loop of the battery 20 by collecting the voltages at both ends of the third resistor R3.
The first capacitor C1, the second capacitor C2 and the third capacitor C3 may be used for filtering. The first end of the first capacitor C1 is grounded, the second end of the first capacitor C1 is electrically connected to the second end of the fifth resistor R5, and preferably, the first capacitor C1 may be a capacitor with a capacitance of 0.1 uF. The first end of the second capacitor C2 is grounded, and the second end of the second capacitor C2 is electrically connected to the second end of the fourth resistor R4, preferably, the second capacitor C2 may be a capacitor with a capacitance of 0.1 uF. The first end of the third capacitor C3 is electrically connected to the second end of the second capacitor C2 and the second end of the fourth resistor R4, the second end of the third capacitor C3 is electrically connected to the second end of the first capacitor C1 and the second end of the fifth resistor R5, and preferably, the third capacitor C3 may adopt a capacitance with a capacitance value of 0.1 uF.
In some embodiments of the present utility model, as shown in fig. 3, the battery preheating device 10 further includes a fuse 5 for implementing overcurrent protection.
Wherein a fuse 5 is provided between the first terminal of the first switching unit 1 and the first pole of the battery 20 for I-breaking when the current value exceeds the protection current value. Specifically, the protection current value I may be set according to the requirements at the time of normal charge and discharge of the battery 20, wherein the protection current value I is generally larger than the target current value as the maximum current allowed to pass through the fuse 5, and the overcurrent protection effect of the first switching unit 1 is more accurate as compared to the fuse 5 when the first switching unit 1 is used as the overcurrent protection unit of the preheating circuit. Wherein, 12 A.ltoreq.I.ltoreq.22A may be provided, for example, I may be provided as 12A or 16A or 20A or 22A, etc., which are not limited herein. Preferably, the protection current value I may be set to 15A, and the pulse short-circuit current may be subjected to two-stage protection by the fuse 5.
In some embodiments of the present utility model, as shown in fig. 3, the battery preheating device 10 further includes a temperature acquisition circuit 6, where the temperature acquisition circuit 6 may include at least one thermistor R6, where the resistance of the thermistor R6 may be set according to the safety requirement of preheating the battery 20, for example, 9kΩ R6 may be set to be equal to or less than 11kΩ, for example, R6 may be set to be 9kΩ or 9.5kΩ or 10kΩ or 11kΩ, etc., which is not limited herein. Preferably, the thermistor R6 may be an NTC thermistor NTC (Negative Temperature Coefficient ) of 10kΩ, for acquiring a temperature value of the battery 20, wherein the temperature value of the battery 20 is the cell temperature.
Wherein the control unit 3 is further electrically connected to the temperature acquisition circuit 6 for controlling the first switching unit 1 to be opened when the temperature value exceeds the target temperature value. Specifically, a target temperature value can be set according to the temperature requirement that the battery cell in the battery 20 is charged and discharged normally, when the thermistor R6 detects that the temperature of the battery cell is too high, in order to prevent the battery 20 from being damaged, the first switch unit 1 is used as an overheat protection unit of the preheating loop, and the control unit 3 timely controls the first switch tube Q1 to be turned off so as to rapidly cut off the battery preheating loop, thereby realizing overheat protection of the battery 20.
In some embodiments of the present utility model, as shown in fig. 4, a block diagram of an electronic device according to one embodiment of the present utility model is shown, wherein the electronic device 100 includes the battery preheating device 10 and the battery 20 of any of the above embodiments.
In some embodiments, the electronic device 100 is a notebook or tablet or smartphone or smartwatch, or the like. The battery 20 in the electronic device 100 is typically a lithium battery having a charge and discharge function, and is typically a small battery, and in a low-temperature environment, when the battery 20 is relatively low in temperature, the device is likely to fail to start up, or power consumption is likely to be too high.
As shown in fig. 3, the battery 20 includes a plurality of series-connected cells, wherein the positive electrode of the first cell of the plurality of series-connected cells is the first pole of the battery 20, and the negative electrode of the tail cell of the plurality of series-connected cells is the second pole of the battery 20. That is, when the battery preheating device 10 preheats the battery 20, the internal resistances of the plurality of battery cells are used as the heater, so that the occupation of the space of the battery 20 can be reduced, the heat is directly diffused to the plurality of battery cells, the preheating efficiency is higher, and each battery cell connected in series can be heated uniformly.
The battery preheating device 10 is electrically connected to the battery 20 for preheating the battery 20 when the low-temperature preheating start condition is satisfied. And stops heating the battery 20 when the low-temperature warm-up end condition is satisfied.
In some embodiments of the present utility model, at least one of the current collection circuit 4, the fuse 5, and the temperature collection circuit 6 is provided on the battery protection plate. The battery protection board is an integrated circuit board that protects a rechargeable battery such as a lithium battery, and when the battery 20 is in operation, the battery protection board can protect the battery 20 from overcharge, overdischarge, overcurrent, short-circuit, and the like. Because the battery protection board is provided with the circuit and the fuse for collecting the current and the temperature, the battery preheating device 10 of the embodiment of the utility model shares the current collecting circuit 4 and the fuse 5 in the battery protection board and shares the temperature collecting circuit 6 in the battery protection board, thereby realizing overcurrent and overheat protection of the battery 20.
In addition, in the battery preheating device 10 according to the embodiment of the present utility model, when the current value of the preheating circuit is too high, the temperature of the battery 20 is too high, or the pulse short circuit is out of control, the preheating circuit can be disconnected in time so as to protect the battery 20.
According to the electronic apparatus 100 according to the embodiment of the present utility model, by adopting the battery preheating device 10 of the above embodiment, it is possible to achieve the preheating of the battery 20 by the pulse short circuit and also to protect the battery 20 during the preheating of the battery 20.
Other constructions and operations of the battery preheating apparatus 10 and the electronic device 100, etc. according to the embodiment of the present utility model are known to those skilled in the art, and will not be described in detail herein.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A battery preheating device, characterized by comprising:
a first switching unit having a first end electrically connected to a first pole of the battery for closing when the battery is preheated;
a second switching unit having a first end electrically connected to a second end of the first switching unit, the second end adapted to be electrically connected to a second pole of the battery for switching on and off at a target frequency at the time of warm-up;
and the control unit is electrically connected with the control end of the first switch unit and the control end of the second switch unit respectively and is used for controlling the first switch unit to be disconnected if the second switch unit is detected to be invalid during preheating.
2. The battery warming-up apparatus according to claim 1, wherein the first switching unit includes:
the first end of the first switching tube is suitable for being electrically connected with the first pole of the battery, the second end of the first switching tube is electrically connected with the second switching unit, and the control end of the first switching tube is electrically connected with the control unit.
3. The battery warming-up apparatus according to claim 2, wherein the first switching unit further comprises:
the first end of the first resistor is electrically connected with the first end of the first switching tube, and the second end of the first resistor is electrically connected with the control end of the first switching tube.
4. The battery warming-up apparatus according to claim 2, wherein the second switching unit includes:
the first end of the second switching tube is electrically connected with the second end of the first switching tube, the second end of the second switching tube is electrically connected with the second pole of the battery, and the control end of the second switching tube is electrically connected with the control unit;
the first end of the second resistor is electrically connected with the second end of the second switching tube, and the second end of the second resistor is electrically connected with the control end of the second switching tube.
5. The battery preheating device according to claim 1, wherein,
the battery preheating device further comprises a current acquisition circuit, wherein the current acquisition circuit is used for acquiring a current value of a preheating loop of the battery;
the control unit is also electrically connected with the current acquisition circuit and used for controlling the first switch unit to be disconnected when the current value exceeds a target current value.
6. The battery preheating device of claim 5, wherein the current acquisition circuit comprises:
a third resistor, a first end of the third resistor being electrically connected to a second end of the second switching unit, a second end of the third resistor being adapted to be electrically connected to a second pole of the battery;
a fourth resistor, wherein a first end of the fourth resistor is electrically connected with a first end of the third resistor, and a second end of the fourth resistor is electrically connected with the control unit;
a fifth resistor, wherein a first end of the fifth resistor is electrically connected with a second end of the third resistor, and a second end of the fifth resistor is electrically connected with the control unit;
the first end of the first capacitor is grounded, and the second end of the first capacitor is electrically connected with the second end of the fifth resistor;
the first end of the second capacitor is grounded, and the second end of the second capacitor is electrically connected with the second end of the fourth resistor;
and the first end of the third capacitor is electrically connected with the second end of the second capacitor and the second end of the fourth resistor, and the second end of the third capacitor is electrically connected with the second end of the first capacitor and the second end of the fifth resistor.
7. The battery warming-up apparatus according to claim 5, further comprising:
and a fuse disposed between the first end of the first switching unit and the first pole of the battery.
8. The battery warming-up apparatus according to claim 1 or 5 or 7, wherein,
the battery preheating device further comprises a temperature acquisition circuit, wherein the temperature acquisition circuit is used for acquiring the temperature value of the battery;
the control unit is also electrically connected with the temperature acquisition circuit and used for controlling the first switch unit to be disconnected when the temperature value exceeds a target temperature value.
9. An electronic device comprising a battery and the battery preheating device of any one of claims 1-8, the battery preheating device being electrically connected to the battery.
10. The electronic device of claim 9, wherein the battery comprises a plurality of series-connected cells, a positive electrode of a first cell of the plurality of series-connected cells being a first pole of the battery, and a negative electrode of a trailing cell of the plurality of series-connected cells being a second pole of the battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222599192.5U CN218919057U (en) | 2022-09-29 | 2022-09-29 | Battery preheating device and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222599192.5U CN218919057U (en) | 2022-09-29 | 2022-09-29 | Battery preheating device and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN218919057U true CN218919057U (en) | 2023-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222599192.5U Active CN218919057U (en) | 2022-09-29 | 2022-09-29 | Battery preheating device and electronic equipment |
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| CN (1) | CN218919057U (en) |
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- 2022-09-29 CN CN202222599192.5U patent/CN218919057U/en active Active
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