CN212462837U - Control module, heating circuit and low-voltage battery pack - Google Patents
Control module, heating circuit and low-voltage battery pack Download PDFInfo
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- CN212462837U CN212462837U CN202021228361.9U CN202021228361U CN212462837U CN 212462837 U CN212462837 U CN 212462837U CN 202021228361 U CN202021228361 U CN 202021228361U CN 212462837 U CN212462837 U CN 212462837U
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Abstract
The utility model discloses a control module, heating circuit and low voltage battery group relates to the battery field. The control module includes: the temperature detection unit is used for outputting a first voltage corresponding to a first temperature of the low-voltage battery pack under the condition that the low-voltage battery pack is in a target charging and discharging working condition; the first comparator is used for comparing the first voltage with the first reference voltage to obtain a first comparison result, and controlling the switch unit to be switched on under the condition that the first comparison result represents that the first temperature is lower than a first temperature threshold value; and the switch unit controls the heating module to heat the low-voltage battery pack when the switch unit is switched on. The embodiment of the utility model provides a control module, heating circuit and low pressure group battery can reduce the low pressure group battery because of the lower safe risk of bringing of temperature.
Description
Technical Field
The utility model relates to a battery electric power field especially relates to control module, heating circuit and low voltage battery group.
Background
With the development of new energy, new energy is adopted as power in more and more fields. Due to the advantages of high energy density, cyclic charging, safety, environmental protection and the like, the low-voltage battery pack is widely applied to the fields of new energy automobiles, consumer electronics, energy storage systems and the like.
However, when the temperature of the low-voltage battery pack is excessively low, safety thereof may be affected. Taking a low voltage battery pack including a plurality of lithium batteries as an example, when the temperature is too low, the lithium batteries may have a lithium precipitation phenomenon, which may affect the safety of the lithium batteries. Therefore, a solution for improving the safety of the low-voltage battery pack is required.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a control module, heating circuit and low pressure group battery can reduce the low pressure group battery because of the lower safe risk of bringing of temperature.
In a first aspect, an embodiment of the present invention provides a control module, including: the temperature detection unit is used for outputting a first voltage corresponding to a first temperature of the low-voltage battery pack under the condition that the low-voltage battery pack is in a target charging and discharging working condition; the first comparator is used for comparing the first voltage with the first reference voltage to obtain a first comparison result, and controlling the switch unit to be switched on under the condition that the first comparison result represents that the first temperature is lower than the first temperature threshold; and the first connecting end of the switch unit is connected with one end of a battery monomer set in the low-voltage battery pack, the second connecting end of the switch unit is connected with the other end of the battery monomer set through the heating module, and the switch unit controls the heating module to heat the low-voltage battery pack when being switched on.
In an alternative embodiment, the control module further comprises: and the first control unit is connected with the temperature detection unit and used for controlling the temperature detection unit to output a first voltage when the low-voltage battery pack is determined to be in the target charging and discharging working condition.
In an optional implementation manner, the first control unit specifically includes: the first voltage division subunit is arranged on a power transmission line of the low-voltage battery pack; the first input end of the second comparator is used for obtaining a second voltage from one end of the first voltage dividing subunit, the second input end of the second comparator is used for obtaining a third voltage from the other end of the first voltage dividing subunit, the output end of the second comparator is connected with the first switch subunit, the second comparator is used for comparing the second voltage with the third voltage to obtain a second comparison result, and under the condition that the second comparison result meets a second preset condition, the low-voltage battery pack is determined to be in a target charging and discharging working condition, and the first switch subunit is controlled to be conducted; the first switch subunit is connected with the temperature detection unit, and controls the temperature detection unit to output a first voltage when the first switch subunit is conducted.
In an alternative embodiment, the control module further comprises: and the second control unit is connected with the temperature detection unit and used for controlling the temperature detection unit to output the first voltage under the condition that the low-voltage battery pack is determined to be in the target charging and discharging working condition and the second temperature of the low-voltage battery pack is lower than the second temperature threshold value.
In an optional implementation manner, the second control unit specifically includes: the second voltage division subunit is arranged on a power transmission line of the low-voltage battery pack; the first input end of the third comparator is used for obtaining a fourth voltage from one end of the second voltage-dividing subunit, the second input end of the third comparator is used for obtaining a fifth voltage from the other end of the second voltage-dividing subunit, the output end of the third comparator is connected with the first input end of the logic gate, the third comparator is used for comparing the fourth voltage with the fifth voltage to obtain a third comparison result, and a target level signal is output under the condition that the third comparison result meets a third preset condition and the low-voltage battery pack is determined to be in a target charging and discharging working condition; a temperature detection subunit for outputting a sixth voltage corresponding to the second temperature; a first input end of the fourth comparator is connected with the temperature detection subunit, a second input end of the fourth comparator is used for acquiring a second reference voltage corresponding to the second temperature threshold, an output end of the fourth comparator is connected with a second input end of the logic gate, the fourth comparator is used for comparing the sixth voltage with the second reference voltage to obtain a fourth comparison result, and when the fourth comparison result indicates that the second temperature is lower than the second temperature threshold, the fourth comparator outputs a target level signal; the output end of the logic gate is connected with the control end of the second switch subunit, and the logic gate is used for controlling the second switch subunit to be conducted when the first input end of the logic gate and the second input end of the logic gate both receive the target level signal; and the second switch subunit is connected with the temperature detection unit and controls the temperature detection unit to output the first voltage when being conducted.
In an alternative embodiment, the temperature sensing unit comprises: one end of the thermistor subunit is connected with a power supply end, and the other end of the thermistor subunit is respectively connected with one end of the third voltage division subunit and the first input end of the first comparator; and the other end of the third voltage division subunit is connected with the reference potential bit.
In a second aspect, an embodiment of the present invention provides a heating circuit, including: the control module provided in the first aspect or any one of the alternative embodiments of the first aspect, and a heating module; wherein, the heating module is used for heating the low-voltage battery pack.
In an optional embodiment, the heating module includes a plurality of heating units connected in parallel, the plurality of heating units connected in parallel are arranged in one-to-one correspondence with the plurality of battery cells of the low-voltage battery pack, and each of the plurality of heating units heats the corresponding arranged battery cell.
In a third aspect, an embodiment of the present invention provides a low voltage battery pack, including: the control module, the heating module, and the at least one battery cell of the first aspect or any alternative embodiment of the first aspect; the heating module is used for heating at least one battery cell.
In an alternative embodiment, a cavity between a box body of the low-voltage battery pack and at least one battery cell is filled with silicone oil, and the silicone oil completely covers the battery cell.
In an alternative embodiment, the volume of silicone oil is not greater than a predetermined percentage of the volume of the cavity, the predetermined percentage being less than 100%.
According to the embodiment of the utility model provides a control module, heating circuit and low pressure group battery, control module include temperature detecting element, first comparator and switch element, and wherein, temperature detecting element can be under the condition that the low pressure group battery is in target charge-discharge operating mode, the first voltage that the first temperature of output and low pressure group battery is corresponding to transmit first voltage to first comparator. The first comparator may obtain a first comparison result indicating that the first temperature is lower than the first temperature threshold by comparing the first voltage with a first reference voltage corresponding to the first temperature threshold, and control the switch unit to be turned on when the first comparison result is obtained, so that the switch unit may control the heating module to heat the voltage battery pack when the switch unit is turned on. Therefore, the embodiment of the utility model provides a control module can judge whether first temperature is less than first temperature threshold value under the condition that the low pressure group battery is in target charge-discharge operating mode to when being less than first temperature threshold value, control heating module heats the low pressure group battery, thereby can heat it when low pressure group battery temperature is low excessively, has reduced the low safe risk that brings because of the temperature of low pressure group battery.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a low-voltage battery pack according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an exemplary low-voltage battery pack according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another exemplary low-voltage battery pack provided in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another exemplary low-voltage battery pack provided in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another exemplary low-voltage battery pack according to an embodiment of the present invention.
Detailed Description
The features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make the objects, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
At this stage, the safety of the low-voltage battery pack may be affected when the temperature of the low-voltage battery pack is too low, for example, a lithium separation phenomenon may also occur when the temperature of the low-voltage battery pack is too low, and particularly, lithium dendrite which easily causes thermal runaway of the battery may be generated after the lithium separation phenomenon continuously occurs, thereby seriously affecting the safety of the low-voltage battery pack. In addition, the life of the battery may be affected by the phenomenon of lithium precipitation.
In addition, when the temperature of the low-voltage battery pack is too low, the low-voltage battery pack may not be charged normally or the discharge capacity may be seriously degraded, which affects the use performance of the low-voltage battery pack.
Therefore, a technical solution for heating the low-voltage battery when the temperature of the battery pack is low is needed.
The embodiment of the utility model provides a control module, heating circuit and low voltage battery group is applicable to and during the scene that low voltage battery group that the temperature was crossed low carries out the heating, especially carries out the specific scene that heats to the lower low pressure lithium cell of temperature. The utility model discloses a temperature detecting element can become positive correlation's first voltage with the temperature according to the temperature conversion of low voltage battery group to utilize the comparator to carry out the comparison to first voltage and the first reference voltage who corresponds first temperature threshold value. And if the comparator is utilized to determine that the temperature of the low-voltage battery pack is lower than the first temperature threshold value, controlling the heating module to heat the low-voltage battery pack. So that the low-voltage battery pack can be heated when its temperature is too low, i.e. below the first temperature threshold.
Furthermore, the utility model discloses a temperature detecting element can generate first voltage under the condition that the low voltage group battery is in target charge-discharge operating mode. Therefore, the utility model discloses can heat it when needs are to low-voltage battery group charge-discharge, do not heat it when the low-voltage battery group stews, improve heating efficiency, reduce the heating energy consumption.
The following parts of the utility model will be described in turn with the attached drawings, the embodiment of the invention provides a low-voltage battery pack, a heating circuit and a control module.
Fig. 1 is a schematic structural diagram of a low-voltage battery pack according to an embodiment of the present invention.
As shown in fig. 1, the low voltage battery pack 10 may include a heating device 11 and a battery cell set 12. Alternatively, the low voltage battery pack 10 may be a 12V or 24V low voltage battery, such as a 12V lithium battery pack. If the low-voltage battery pack 10 is installed in a vehicle, the low-voltage battery pack 10 may supply power to low-voltage electric devices in the vehicle, such as a battery management system, a vehicle control unit, and the like.
First, the battery cell assembly 12 will be specifically described below.
The battery cell set 12 includes at least one battery cell 121 to 12N, where N is any positive integer, for convenience of illustration, fig. 1 illustrates the battery cell set 12 by taking N equal to 4 as an example, that is, by taking the battery cell set 12 includes 4 battery cells as an example.
Specifically, with continued reference to fig. 1, the battery cell set 12 may be formed by connecting N cells in series, for example, a 12V lithium battery pack may include 4 lithium battery cells connected in series. In addition, the battery cell set 12 may also be formed by connecting a plurality of lithium battery cells in parallel or in series, which is not limited to this.
Next, the heating device 11 will be specifically described below.
The heating device 11 comprises a heating module 111 and a control module 112 for the heating module. The following portions of the present invention are specifically explained with respect to the heating module 111 and the control module 112, respectively.
The heating module 111 is specifically described below.
The heating module 111 is used for heating the battery cell set 12. The heating module 111 can convert electric energy into thermal energy, and heat the battery cell assembly 12 with the converted thermal energy. Illustratively, the heating module may be a heating film, a heating plate, an electromagnetic heating coil, or the like. Wherein, the heating module can be laminated with the battery monomer, also can keep apart the setting. For example, the heating film may be adhered to the battery cell.
In some embodiments of the present invention, the heating module 111 may include a plurality of heating units J1 to JN connected in parallel. The plurality of parallel heating units J1 to JN are disposed in one-to-one correspondence with the plurality of battery cells 121 to 12N of the low voltage battery pack, and each of the plurality of heating units J1 to JN heats the corresponding disposed battery cell.
Exemplarily, fig. 2 is a schematic structural diagram of an exemplary low-voltage battery pack provided in an embodiment of the present invention. As shown in fig. 2, the heating module 111 includes 4 heating units J1 to J4 connected in parallel. The heating unit J1 is used for heating the battery cell 121, the heating unit J2 is used for heating the battery cell 122, the heating unit J3 is used for heating the battery cell 123, and the heating unit J4 is used for heating the battery cell 124. Each heating unit may be embodied as a heating film, and the heating film is attached to each battery cell to be heated.
In the present embodiment, by providing N heating units connected in parallel, the heating rate of the battery cell assembly 12 can be increased. In addition, each battery cell is correspondingly provided with one heating unit, so that when heating is needed, the plurality of heating units of the heating module 111 can uniformly heat each battery cell, and the heating quality is improved.
After the description of the heating module 111, the following sections of the present invention will provide a detailed explanation of the control module 112 of the heating module 111.
The control module 112 is described in detail below.
The control module 112 is configured to control the heating module 111 to heat the low-voltage battery pack when the low-voltage battery pack 10 is in the target charging and discharging operating condition and the temperature of the low-voltage battery pack is lower than a preset temperature threshold. Specifically, the control module 112 may control the heating module 111 to heat the cell set 12 of the low voltage battery pack 10.
With continued reference to fig. 1, the control module 112 may specifically include: a temperature detection unit 1121, a first comparator Q1, and a switching unit 1122.
In order to fully understand the control module 112, the following portions of the present invention will be explained in detail with reference to the temperature detecting unit 1121, the first comparator Q1 and the switch unit K1 in turn.
First, the temperature detection unit 1121 will be specifically described as follows.
The target charging and discharging working condition may be a charging working condition, or the target charging and discharging working condition may be a discharging working condition, or the target charging and discharging working condition may be a charging working condition or a discharging working condition. The target charging/discharging condition may be set according to a specific heating scenario and a heating requirement, for example, if it is considered that the low-voltage battery pack cannot be charged or is slowly charged when the temperature of the low-voltage battery pack is too low, the control module 112 may control the heating module 111 to heat the low-voltage battery pack 10 when the low-voltage battery pack 10 is in a charging condition and the temperature is low.
Wherein the first temperature of the low voltage battery pack 10 is used as a measure of the temperature of the low voltage battery pack 10. For example, the first temperature of the low voltage battery pack 10 may be the temperature of a battery cell of the low voltage battery pack 10, and accordingly, the temperature detection unit 1121 may be attached to the surface of the battery cell. Alternatively, the first temperature of the low-voltage battery pack 10 may be an external ambient temperature of the low-voltage battery pack 10, and accordingly, the temperature detection unit 1121 may be disposed outside the case of the low-voltage electromagnetic pack 1. Still alternatively, the first temperature of the low-voltage battery pack 10 may be a temperature inside a case of the low-voltage battery pack 10, and accordingly, the temperature detection unit 1121 may be provided in the case of the low-voltage electromagnetic pack 10.
Wherein the temperature detection unit 1121 is capable of generating voltage information corresponding to the temperature information from the temperature information. The temperature detecting unit 1121 may be a voltage dividing unit composed of a thermistor and a divided voltage, and in this case, the temperature information and the generated voltage information may be in a positive correlation or a negative correlation. The temperature detecting unit 1121 may also be another temperature detecting unit, such as a temperature sensor.
Illustratively, the temperature detection unit 1121 may include a thermistor sub-unit and a third voltage division sub-unit.
Wherein, the resistance of the thermistor subunit can change along with the temperature change, one end of the thermistor subunit is connected with the power supply end, and the other end of the thermistor subunit is respectively connected with one end of the third voltage division subunit and the first input end IN of the first comparator Q11And (4) connecting. Illustratively, the thermistor may be a Negative Temperature Coefficient thermistor (NTC).
And the other end of the third voltage division subunit is connected with the reference potential bit. Illustratively, the third voltage dividing subunit may include one or more resistors.
As a specific example, fig. 3 is a schematic structural diagram of another exemplary low-voltage battery pack according to an embodiment of the present invention. As shown in fig. 3, the temperature detection unit 1121 includes a negative temperature coefficient thermistor NTC1 and a voltage dividing resistor R1. One end of the negative temperature coefficient thermistor NTC1 is connected to a second power supply terminal VCC2, and the other end of the negative temperature coefficient thermistor NTC1 is respectively connected to one end of a voltage dividing resistor R1 and a first input terminal IN of a first comparator Q11The other end of the voltage dividing resistor R1 is connected to the ground terminal GND 2.
Specifically, the lower the first temperature is, the larger the resistance of the negative temperature coefficient thermistor NTC1 is, the larger the voltage division on the negative temperature coefficient thermistor NTC1 is, and accordingly the smaller the voltage division of the voltage division resistor R1 is. Since the voltage of the ground GND2 can be regarded as 0, the first input IN of the first comparator Q11The value of the acquired first voltage is substantially equal to the divided voltage of R1. Therefore, the lower the first temperature, the lower the first voltage, that is, when the thermistor is a negative temperature coefficient thermistor and one end of the thermistor is connected to a power supply terminal, the first temperature is in a positive correlation with the first voltage. Similarly, when the thermistor is a negative temperature coefficient thermistor and one end of the thermistor is connected to the ground, the first temperature and the first voltage are in a negative correlation relationship.
Similarly, when the thermistor is a Positive Temperature Coefficient (PTC) thermistor and one end of the thermistor is connected to a power supply terminal, the first Temperature and the first voltage are in a negative correlation. When the thermistor is a PTC and one end of the thermistor is connected with the ground, the first temperature and the first voltage are in positive-negative correlation.
Next, after the temperature detecting unit 1121 is introduced, the following portions of the embodiments of the present invention describe the first comparator Q1 specifically as follows.
For the first comparator Q1, its first input IN1Is connected to the temperature detection unit 1121. For a specific connection relationship, reference may be made to the related description of the temperature detecting unit 1121 in the above-mentioned portions of the embodiments of the present invention, which is not repeated herein.
First comparisonSecond input IN of Q12For acquiring a first reference voltage connection corresponding to a first temperature threshold. For example, with continued reference to fig. 3, the first comparator Q1 may obtain a first reference voltage from between the voltage-dividing resistor R2 and the voltage-dividing resistor R3. Specifically, the structures of the voltage-dividing resistor R2 and the voltage-dividing resistor R3 include: one end of the voltage dividing resistor R2 is connected to a third power supply terminal VCC3, and the other end of the voltage dividing resistor R2 is respectively connected to one end of the voltage dividing resistor R3 and a second input terminal IN of the first comparator Q12The other end of the voltage dividing resistor R3 is connected to the ground terminal GND 3.
Output terminal OUT of the first comparator Q11And control terminal G of switch unit K11And (4) connecting.
The first comparator Q1 is configured to compare the first voltage with a first reference voltage to obtain a first comparison result, and control the switch unit K1 to turn on when the first comparison result indicates that the first temperature is lower than a first temperature threshold. Specifically, the first comparator Q1 controls the switch unit K1 to be turned on in a manner that the first comparator Q1 provides a control end G of the switch unit K11And outputting a high level signal.
Wherein, for the first comparison result, if the first temperature and the first voltage have a positive correlation, the first comparison result includes that the first voltage is smaller than the first reference voltage. Or, if the first temperature and the first voltage are in a negative correlation, the first comparison result comprises that the first voltage is greater than the first reference voltage.
The first comparator Q1 further has two power supply terminals, one of which is connected to the first power supply terminal VCC1, and the other of which is connected to the ground GND 1.
Next, the switch unit K1 will be specifically described below.
First connection L of switch unit K11Is connected to one end of the cell group 12 in the low-voltage battery pack 10. Exemplarily, the first connection L of the switch unit K11May be connected to the positive electrode of the battery cell collection 12.
Second connection L of switch unit K12And is connected to the other end of the battery cell assembly 12 via the heating module 111. Exemplary second connection of switching unit K1Connecting end L2May be connected to the negative electrode of the battery cell assembly 12 via the heating module 111.
When the switch unit K1 is turned on, i.e. the first connection terminal L of the switch unit K11And a second connection terminal L2When the battery cell assembly is connected, the heating module 111 is controlled to heat the battery cell assembly 12. Alternatively, the battery unit K1 may be embodied as a relay or a semiconductor switch.
Illustratively, with continued reference to fig. 3, when the battery unit K1 includes a relay, the control terminal of the battery unit K1 includes a core of the relay, and a coil wound around the core, one end of the coil serving as the control terminal G of the switch unit K11One end of the coil is connected with the output end OUT of the first comparator Q11The other end of the coil is connected to ground GND 4. When the coil passes through the current, the coil with the iron core outputs a corresponding magnetic field to attract the armature, and the first connecting end L is connected through the armature1And a second connection terminal L2And (4) communicating.
Furthermore, considering that the control module 112 needs to control the heating module 111 under the target charging/discharging condition, in some embodiments of the present invention, the control module 2 may further include a control unit 1122 for determining whether the target charging/discharging condition is met.
The following portions of the embodiments of the present invention will be specifically explained for the control unit 1122 included in the control module 112 by two embodiments.
In the first embodiment, the control module 112 further includes a first control unit 1122.
Fig. 4 is a schematic structural diagram of a low-voltage battery pack according to an embodiment of the present invention. As shown in fig. 4, first control unit 1122 is connected to temperature detection unit 1121, and is configured to control temperature detection unit 1121 to output a first voltage when it is determined that low-voltage battery pack 10 is in the target charge/discharge operating condition.
Illustratively, with continued reference to fig. 4, the first control unit 1122 specifically includes a first voltage dividing subunit R4, a second comparator Q2, and a first switching subunit K2.
Wherein, the first voltage dividing subunit R4 is disposed on the power line of the low voltage battery pack 10. The transmission line of the low-voltage battery pack 10 represents a line through which the battery cell set 12 discharges to a load and obtains electric energy from an external power source. Specifically, the first voltage-dividing subunit R4 may be provided on the positive power line or the negative power line of the low-voltage battery pack 10. When current flows through the power line, the voltage across the first voltage-dividing subunit R4 is different. The first voltage-dividing subunit R4 may include one or more resistors.
First input IN of a second comparator Q23For passing from one end P of the first voltage-dividing subunit R41A second input IN of a second comparator Q2 for obtaining a second voltage4For passing from the other end P of the first voltage-dividing subunit R42Obtaining a third voltage, the output OUT of the second comparator Q22Is connected to the first switch subunit K2.
And the second comparator Q2 is used for comparing the second voltage with the third voltage to obtain a second comparison result, and determining that the low-voltage battery pack is in a target charging and discharging working condition and controlling the first switch subunit to be switched on under the condition that the second comparison result meets a second preset condition.
For the second preset condition, if the first voltage dividing subunit R4 is set in the positive power transmission line and the target charging/discharging operating condition is the charging operating condition, or if the first voltage dividing subunit R4 is set in the negative power transmission line and the target charging/discharging operating condition is the discharging operating condition, the second preset condition is that the second voltage is smaller than the third voltage.
Or, if the first voltage-dividing subunit R4 is disposed in the positive power transmission line and the target charging/discharging operating condition is a discharging operating condition, or if the first voltage-dividing subunit R4 is disposed in the negative power transmission line and the target charging/discharging operating condition is a charging operating condition, the second preset condition is that the second voltage is the third voltage.
In addition, if the target charge-discharge operating condition is a discharge operating condition and a charge operating condition, two comparators Q2 and an or gate may be provided, wherein the first input terminal of the first comparator Q2 and the terminal P of the first voltage-dividing subunit R41Is connected with its second input terminal to the other end P of the first voltage-dividing subunit R42And (4) connecting. Second comparator Q2 and the other end P of the first voltage dividing subunit R42Connected with a second input terminal to one terminal P of a first voltage-dividing subunit R41And (4) connecting. The output terminals of the two second comparators Q2 are connected to the input terminal of the OR gate, and the output terminal of the OR gate is connected to the control terminal G of the first switch subunit K22。
The first switch subunit K2 is connected to the temperature detecting unit 1121, and the first switch subunit K2 controls the temperature detecting unit 1121 to output the first voltage when being turned on. The first switch subunit may be a semiconductor switch, such as a triode, a metal oxide semiconductor, or the like, or may be a relay.
Illustratively, with continued reference to fig. 4, a first switch subunit K2 is disposed between the other ends of the third voltage-dividing subunit R1. When the first switch subunit K2 is turned off, the voltage between the thermistor subunit NTC1 and the third voltage-dividing subunit R1 is always equal to the voltage of the second power source terminal VCC 2. When the second switch subunit K2 is turned on, the first voltage is equal to the divided voltage of the third voltage-dividing subunit R1, and the first voltage varies with the first temperature variation.
In the second embodiment, the control module 112 further comprises a second control unit 1123.
Fig. 5 is a schematic structural diagram of another exemplary low-voltage battery pack according to an embodiment of the present invention. As shown in fig. 5, the second control unit 1123 is connected to the temperature detection unit 1211, and is configured to control the temperature detection unit 1121 to output the first voltage if it is determined that the low-voltage battery pack 10 is in the target charge and discharge condition and the second temperature of the low-voltage battery pack 10 is lower than the second temperature threshold value.
The relevant content of the second temperature can be referred to the relevant description of the first temperature in the above embodiments of the present invention, and is not repeated herein. Alternatively, the first temperature and the second temperature may be collected at the same position of the low voltage battery pack 10, and at this time, the temperature detection subunit collecting the second temperature may be regarded as a redundant design of the temperature detection unit 1121. Alternatively, the first temperature and the second temperature may be collected at different positions of the low voltage battery pack 10, and in this case, the temperatures at different positions may be collected in consideration of the fact that the low voltage battery pack 10 may have a local temperature distribution that is not uniform, so that the low voltage battery pack 10 may be heated when the local temperature distribution is not uniform.
Exemplarily, with continued reference to fig. 5, the second control unit 1123 specifically includes a second voltage dividing subunit R5, a third comparator Q3, a temperature detecting subunit D1, a fourth comparator Q4, a logic gate & and a second switching subunit K3.
Wherein, the second voltage dividing subunit R5 is disposed on the power line of the low-voltage battery pack. For the details of the second voltage dividing subunit R5, reference may be made to the description of the first voltage dividing subunit R4 in the above embodiments of the present invention, and details are not repeated herein.
Wherein the first input terminal IN of the third comparator Q35For passing from one end P of the second voltage-dividing sub-unit R53A fourth voltage is obtained. Second input IN of third comparator Q36For passing from the other end P of the second voltage-dividing subunit R54A fifth voltage is obtained. The output OUT of the third comparator Q33AND logic gate&First input terminal IN of9And (4) connecting.
And the third comparator Q3 is used for comparing the fourth voltage with the fifth voltage to obtain a third comparison result, and outputting a target level signal under the condition that the third comparison result meets a third preset condition and the low-voltage battery pack is determined to be in a target charging and discharging working condition. Illustratively, the target level signal may be a high level signal. In addition, other contents of the third comparator Q3 can be referred to the related description of the second comparator Q2 in the above embodiments of the present invention, and are not repeated herein.
The temperature detecting subunit D1 is configured to output a sixth voltage corresponding to the second temperature. With continued reference to fig. 5, the temperature detection sub-unit D1 may include a thermistor NTC2 and a voltage dividing resistor R6. For other contents of the temperature detecting subunit D1, reference may be made to the related description of the temperature detecting unit 1121 in the above embodiments of the present invention, which is not repeated herein.
First input IN of a fourth comparator Q47Is connected with a temperature detection subunit D1. Illustratively, with continued reference to FIG. 5, the temperature may be determined from a thermistor NTC2 and a voltage divider resistorA sixth voltage is taken between R6.
Second input IN of fourth comparator Q48For obtaining a second reference voltage corresponding to a second temperature threshold. Illustratively, with continued reference to fig. 5, a second reference voltage may be collected from voltage divider subunit D2. The voltage dividing subunit comprises a voltage dividing resistor R7 and a voltage dividing resistor R8, one end of the voltage dividing resistor R7 is connected with a sixth power supply terminal VCC6, and the other end of the voltage dividing resistor R7 is respectively connected with a second input terminal IN of a fourth comparator Q48And one end of a voltage dividing resistor R8. The other end of the divider resistor R8 is connected to the ground GND 6.
Output terminal OUT of the fourth comparator Q44AND logic gate&Second input terminal IN of10And (4) connecting.
The fourth comparator Q4 is configured to compare the sixth voltage with the second reference voltage to obtain a fourth comparison result, and output a target level signal if the fourth comparison result indicates that the second temperature is lower than the second temperature threshold. For other contents of the fourth comparator Q4, reference may be made to the description of the first comparator Q1 in the above embodiments of the present invention, and details are not repeated here.
Logic gate&The output terminal OUT5 and the control terminal G of the second switch subunit K33And (4) connecting. Logic gate&For in logic gates&First input terminal IN of9And logic gate&Second input terminal IN of10And when the target level signal is received, the second switch subunit is controlled to be conducted. Illustratively, if logic gates&First input terminal IN of9And logic gate&Second input terminal IN of10All receive the high level signal, then to the control terminal G of the second switch subunit K33And outputting a high level signal. On the contrary, if the logic gate&First input terminal IN of9And logic gate&Second input terminal IN of10At least one terminal receiving low level signal is connected to control terminal G of second switch subunit K33And outputting a low level signal.
The second switch subunit K3 is connected to the temperature detecting unit 1121, and the second switch subunit K3 controls the temperature detecting unit 1121 to output the first voltage when being turned on. For other contents of the second switch subunit K3, refer to the description of the first switch subunit K2 in the above embodiments of the present invention, which is not repeated herein.
According to the embodiment of the utility model provides a control module, heating circuit and low pressure group battery, control module include temperature detecting element, first comparator and switch element, and wherein, temperature detecting element can be under the condition that the low pressure group battery is in target charge-discharge operating mode, the first voltage that the first temperature of output and low pressure group battery is corresponding to transmit first voltage to first comparator. The first comparator may obtain a first comparison result indicating that the first temperature is lower than the first temperature threshold by comparing the first voltage with a first reference voltage corresponding to the first temperature threshold, and control the switch unit to be turned on when the first comparison result is obtained, so that the switch unit may control the heating module to heat the voltage battery pack when the switch unit is turned on. Therefore, the embodiment of the utility model provides a control module can judge whether first temperature is less than first temperature threshold value under the condition that the low pressure group battery is in target charge-discharge operating mode to when being less than first temperature threshold value, control heating module heats the low pressure group battery, thereby can heat it when low pressure group battery temperature is low excessively, has reduced the low safe risk that brings because of the temperature of low pressure group battery.
In addition, the heating of the low-voltage Battery pack can be realized by utilizing the control module, and the control modules such as a Battery Management System (BMS) and the like do not need to be additionally arranged, so that the structure of the low-voltage Battery pack is simplified, and the volume of the low-voltage Battery pack is reduced.
Finally, the utility model discloses above-mentioned embodiment has introduced in detail if the improvement because of the lower safety risk that brings of low-voltage battery package temperature. In addition, there is a safety risk due to the high temperature of the low-voltage battery pack in the actual process.
In some embodiments of the present invention, in order to solve the above problem, a cavity between the box of the low voltage battery pack 10 and the at least one battery cell 121 to 12N is filled with silicone oil, and the silicone oil completely covers the battery cell. That is, the space between the case of the low-voltage battery pack 10 and each battery cell is filled with silicone oil.
Since the silicone oil has good heat conductivity and heat dissipation performance, the silicone oil is filled in the gap between the box body of the low-voltage battery pack 10 and each battery cell, and when the temperature of the low-voltage battery pack 10 rises, the silicone oil can help the low-voltage battery pack 10 to conduct heat and dissipate heat, thereby preventing the low-voltage battery pack 10 from overheating.
In addition, when the low-voltage battery pack 10 is too high, the silicone oil completely coats the battery monomer, so that the battery monomer can be isolated from air, and the safety risks of smoke, fire and the like of the low-voltage battery pack 10 are avoided.
Alternatively, in order to prevent the low-voltage battery pack 10 from mechanical expansion, the volume of the silicone oil filled in the low-voltage battery pack is not more than a predetermined percentage of the volume of the cavity, the predetermined percentage being less than 100%. That is, when the low voltage battery pack is placed upright, there is a gap between the level of the silicone oil and the top cover assembly of the tank of the low voltage battery pack.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The method embodiment is described in a simpler way, and for the relevant points, reference is made to the description of the system embodiment. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications, and additions or change the order between the steps after appreciating the spirit of the invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The functional blocks in the above embodiments may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like.
Claims (11)
1. A control module, characterized in that the control module comprises:
the temperature detection unit is used for outputting a first voltage corresponding to a first temperature of the low-voltage battery pack under the condition that the low-voltage battery pack is in a target charging and discharging working condition;
a first comparator, a first input end of which is connected to the temperature detection unit, a second input end of which is used to obtain a first reference voltage corresponding to a first temperature threshold, an output end of which is connected to a control end of a switch unit, and the first comparator is used to compare the first voltage with the first reference voltage to obtain a first comparison result, and control the switch unit to be turned on when the first comparison result indicates that the first temperature is lower than the first temperature threshold;
the first connecting end of the switch unit is connected with one end of a single battery set in the low-voltage battery pack, the second connecting end of the switch unit is connected with the other end of the single battery set through a heating module, and the switch unit controls the heating module to heat the low-voltage battery pack when being conducted.
2. The control module of claim 1, further comprising:
and the first control unit is connected with the temperature detection unit and used for controlling the temperature detection unit to output the first voltage when the low-voltage battery pack is determined to be in a target charging and discharging working condition.
3. The control module according to claim 2, wherein the first control unit specifically comprises:
a first voltage-dividing subunit disposed on a power transmission line of the low-voltage battery pack;
a first input end of the second comparator is used for obtaining a second voltage from one end of the first voltage-dividing subunit, a second input end of the second comparator is used for obtaining a third voltage from the other end of the first voltage-dividing subunit, an output end of the second comparator is connected with the first switch subunit, the second comparator is used for comparing the second voltage with the third voltage to obtain a second comparison result, and when the second comparison result meets a second preset condition, the low-voltage battery pack is determined to be in a target charging and discharging working condition, and the first switch subunit is controlled to be switched on;
the first switch subunit is connected with the temperature detection unit and controls the temperature detection unit to output the first voltage when the first switch subunit is conducted.
4. The control module of claim 1, further comprising:
and the second control unit is connected with the temperature detection unit and used for controlling the temperature detection unit to output the first voltage under the condition that the low-voltage battery pack is determined to be in the target charging and discharging working condition and the second temperature of the low-voltage battery pack is lower than a second temperature threshold value.
5. The control module according to claim 4, wherein the second control unit specifically comprises:
the second voltage division subunit is arranged on a power transmission line of the low-voltage battery pack;
a first input end of the third comparator is used for obtaining a fourth voltage from one end of the second voltage-dividing subunit, a second input end of the third comparator is used for obtaining a fifth voltage from the other end of the second voltage-dividing subunit, an output end of the third comparator is connected with a first input end of a logic gate, the third comparator is used for comparing the fourth voltage with the fifth voltage to obtain a third comparison result, and a target level signal is output under the condition that the third comparison result meets a third preset condition and the low-voltage battery pack is determined to be in a target charging and discharging working condition;
a temperature detection subunit for outputting a sixth voltage corresponding to the second temperature;
a fourth comparator, a first input end of which is connected to the temperature detection subunit, a second input end of which is configured to obtain a second reference voltage corresponding to a second temperature threshold, an output end of which is connected to a second input end of the logic gate, and which is configured to compare the sixth voltage with the second reference voltage to obtain a fourth comparison result, and output a target level signal when the fourth comparison result indicates that the second temperature is lower than the second temperature threshold;
the output end of the logic gate is connected with the control end of the second switch subunit, and the logic gate is used for controlling the second switch subunit to be conducted when the first input end of the logic gate and the second input end of the logic gate both receive the target level signal;
the second switch subunit, the second switch subunit with the temperature detection unit is connected, the second switch subunit controls when switching on the temperature detection unit output first voltage.
6. The control module of claim 1, wherein the temperature detection unit comprises:
one end of the thermistor subunit is connected with a power supply end, and the other end of the thermistor subunit is respectively connected with one end of the third voltage division subunit and the first input end of the first comparator;
and the other end of the third voltage division subunit is connected with a reference potential bit.
7. A heating circuit, characterized in that the heating circuit comprises:
a control module as claimed in any one of claims 1 to 6, and a heating module;
the heating module is used for heating the low-voltage battery pack.
8. The heating circuit of claim 7,
the heating module comprises a plurality of heating units which are connected in parallel, the plurality of heating units which are connected in parallel are arranged in one-to-one correspondence with the plurality of battery monomers of the low-voltage battery pack, and each heating unit in the plurality of heating units heats the corresponding battery monomer.
9. A low voltage battery, comprising:
the control module, heating module and at least one battery cell of any of claims 1 to 6;
wherein, the heating module is used for heating the at least one battery cell.
10. The low voltage battery pack according to claim 9,
and silicone oil is filled in a cavity between the box body of the low-voltage battery pack and the at least one battery monomer, and the battery monomer is completely coated by the silicone oil.
11. The low voltage battery pack according to claim 10,
the volume of the silicone oil is not greater than a predetermined percentage of the volume of the cavity, the predetermined percentage being less than 100%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021228361.9U CN212462837U (en) | 2020-06-29 | 2020-06-29 | Control module, heating circuit and low-voltage battery pack |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021228361.9U CN212462837U (en) | 2020-06-29 | 2020-06-29 | Control module, heating circuit and low-voltage battery pack |
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| CN212462837U true CN212462837U (en) | 2021-02-02 |
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