CN111009703A - Heating control device and heating control method for battery - Google Patents

Abstract

The invention discloses a heating control device and a heating control method of a battery, wherein the heating control device comprises at least three heating modules, the heating modules are arranged in one-to-one correspondence with electric core groups, and the heating modules heat electric cores in the corresponding electric core groups when being started; the temperature detection modules are arranged in one-to-one correspondence with the cell groups and detect the real-time temperature of the cells in the corresponding cell groups and generate temperature detection signals; the control module adjusts the opening state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power supply signal, and adjusts the heating power of the corresponding heating module through the first switch according to the received temperature detection signal so that the temperature difference between the electric core group with the maximum temperature and the electric core group with the minimum temperature is smaller than or equal to a set difference. By the technical scheme, the consistency of the cell temperature is improved.

Description

A heating control device for a battery and a heating control method thereof

technical field

Embodiments of the present invention relate to the technical field of batteries, and in particular, to a heating control device for a battery and a heating control method thereof.

Background technique

Batteries such as lithium iron phosphate batteries cannot be charged at low temperatures. For example, after charging lithium iron phosphate batteries, the battery voltage will immediately jump to the full charge voltage at room temperature, and the charging current is also very small, which is easy to cause damage to the battery and cannot be restored. .

In order to solve the above problems, at present, the cells of the battery can be heated before the battery is charged, and the battery can be charged after reaching the temperature that allows the battery to be charged. The traditional heating method is generally to set heating devices on both sides of the battery. However, due to the large difference between the distance between the heating device and the different cells in the battery, the consistency of the temperature of the cells is poor, and the maximum temperature difference between the cells can even reach 25°C, resulting in the battery being used for a period of time. The consistency of the voltage between the cells is getting worse and worse, and the power of the battery depends on the cell with the smallest voltage, which leads to the gradual reduction of the available capacity of the battery, which seriously affects the service life of the battery.

SUMMARY OF THE INVENTION

In view of this, the embodiment of the present invention provides a heating control device for a battery and a heating control method thereof, which avoids the problem that the battery is damaged and cannot be recovered caused by charging the battery at a low temperature, improves the consistency of the temperature of the battery cell, and prolongs the battery life. battery life.

In a first aspect, an embodiment of the present invention provides a heating control device for a battery, the battery includes a plurality of battery cells arranged in layers, the battery cells are divided into at least three battery cell groups, each of the battery cell groups Including a plurality of the battery cells, the difference in the number of battery cells between the battery cell group containing the largest number of battery cells and the battery cell group containing the least number of battery cells is less than or equal to 1;

The heating control device includes:

At least three heating modules, the heating modules are arranged in a one-to-one correspondence with the battery cell groups, and the heating modules are used to heat the cells in the corresponding battery cell groups when turned on;

At least three temperature detection modules, the temperature detection modules are set in a one-to-one correspondence with the cell groups, and the temperature detection modules are used to detect the real-time temperature of the cells in the corresponding cell group and generate temperature detection Signal;

a control module and a first switch corresponding to each of the heating modules, the control module is used to adjust the opening of the corresponding heating module through the first switch according to the temperature detection signal and the received external power supply signal state, and is used to adjust the heating power of the corresponding heating module through the first switch according to the received temperature detection signal to make the difference between the cell group with the largest temperature and the cell group with the smallest temperature The temperature difference between them is less than or equal to the set difference.

Further, along the stacking direction of the battery cells, the heating module and the battery core group are arranged at intervals;

Preferably, the heating module includes a heating film.

Further, the control module includes a heating power signal output terminal and a plurality of pulse adjustment signal output terminals;

The control terminal of the first switch is electrically connected to the corresponding pulse adjustment signal output terminal, the first terminal of the first switch is electrically connected to the heating power signal output terminal, and the second terminal of the first switch is electrically connected It is electrically connected with the corresponding heating module, and the first switch is used to adjust the communication time between the first end and the second end according to the pulse adjustment signal received by the control end to adjust the corresponding heating module. heating power.

Further, the heating control device also includes:

A second switch, the control module is configured to adjust the on state of the corresponding heating module through the first switch and the second switch according to the temperature detection signal and the received external power supply signal.

Further, the control module includes a switch control signal output end, a heating power signal output end and a plurality of pulse adjustment signal output ends;

The control end of the second switch is electrically connected to the switch control signal output end, and the first end of the second switch is electrically connected to the heating power signal output end;

The control terminal of the first switch is electrically connected to the corresponding output terminal of the pulse adjustment signal, the first terminals of all the first switches are short-circuited and are electrically connected to the second terminals of the second switches, and the The second end of a switch is electrically connected to the corresponding heating module, and the first switch is used to adjust the connection time between the first end and the second end according to the pulse adjustment signal received by the control end to adjust the corresponding heating module. The heating power of the heating module.

Further, the heating control device also includes:

At least three current detection modules, the current detection modules are set in a one-to-one correspondence with the heating modules, and the current detection modules are used to detect the real-time current of the corresponding heating modules and generate a current detection signal;

The control module is further configured to adjust the ON state of the heating module through a corresponding switch according to the received current detection signal;

Preferably, the current detection module includes a Hall sensor.

In a second aspect, an embodiment of the present invention further provides a battery heating control method, which is executed by the battery heating control device according to the first aspect, and the battery heating control method includes:

The temperature detection module detects the real-time temperature of the cells in the corresponding cell group and generates a temperature detection signal;

The control module adjusts the ON state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power supply signal;

The control module adjusts the heating power of the corresponding heating module through the first switch according to the received temperature detection signal, so that there is a difference between the cell group with the highest temperature and the cell group with the smallest temperature The temperature difference is less than or equal to the set difference.

Further, the control module adjusting the ON state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power supply signal includes:

When the control module determines, according to the temperature detection signal, that the temperature of the cell group with the lowest temperature is lower than the set temperature and the received external power signal is an effective external power signal, it controls all heating through the first switch. module open;

Before the control module adjusts the heating power of the corresponding heating module through the first switch according to the received temperature detection signal, all the heating modules heat the corresponding cell group with the maximum power.

Further, the control module adjusts the heating power of the corresponding heating module through the first switch according to the received temperature detection signal so as to make the battery cell group with the highest temperature and the battery cell with the minimum temperature The temperature difference between groups is less than or equal to the set difference including:

The control module obtains the battery cell group with the highest temperature according to the received temperature detection signal;

The control module adjusts the pulse adjustment signal output to the first switch of the cell group with the highest temperature and reduces the heating power of the heating module corresponding to the cell group with the highest temperature to a first set heating power;

The control module obtains the battery cell group with the highest temperature again according to the received temperature detection signal every set time;

If the cell group with the highest temperature determined twice before and after is the same cell group, the control module adjusts the pulse adjustment signal output to the first switch of the cell group corresponding to the highest temperature and reduces the temperature of the cell group with the highest temperature. The heating power of the heating module corresponding to the cell group reaches a second set heating power; wherein, the second set heating power is smaller than the first set heating power;

If the cell group with the highest temperature determined twice before and after is a different cell group, the control module adjusts the pulse adjustment signal output to the first switch of the cell group corresponding to the current highest temperature and reduces the maximum temperature The heating power of the heating module corresponding to the battery cell group reaches the first set heating power, and the heating power of the heating module that was reduced last time is restored to the maximum heating power.

Further, the control module adjusting the ON state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power signal further includes:

When the control module determines according to the temperature detection signal that the temperature of the battery cell group with the lowest temperature is greater than or equal to the set temperature, it controls all the heating modules to turn off through the corresponding switches; or,

When the control module determines that the battery supplies power to the heating module according to the received external power signal, it controls all the heating modules to turn off through corresponding switches.

The embodiment of the present invention provides a heating control device for a battery and a heating control method thereof. The control module is configured to adjust the opening of the corresponding heating module through a first switch according to the temperature detection signal fed back by the temperature detection module and the received external power supply signal. The battery can only be charged when the temperature reaches the rechargeable temperature of the battery, which greatly reduces the use limit of the battery in the original low temperature environment, and the battery can be used in relatively extreme working conditions. The following problem is that the battery is damaged and irrecoverable due to charging the battery. In addition, the control module is further configured to adjust the heating power of the corresponding heating module through the first switch according to the received temperature detection signal, until the temperature difference between the cell group with the highest temperature and the cell group with the smallest temperature is less than the set value The difference value, according to the real-time temperature of different cell groups, the heating power of the corresponding heating module is continuously adjusted, and finally the temperature of all cells in the battery is similar, which greatly improves the consistency of the temperature of the cells, and then optimizes the temperature of the cells. The consistency of the voltage between the two slows down the rate of battery decay and prolongs the service life of the battery.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the background technology, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the background technology. Obviously, the drawings in the following description are the For the schematic diagrams of some embodiments of the invention, for those of ordinary skill in the art, other solutions can also be obtained according to these drawings without creative efforts.

1 is a schematic structural diagram of a heating control device for a battery according to an embodiment of the present invention;

2 is a schematic structural diagram of another battery heating control device provided by an embodiment of the present invention;

FIG. 3 is a schematic flowchart of a heating control method for a battery according to an embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention. Throughout this specification, the same or similar reference numbers represent the same or similar structures, elements or processes. It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict.

FIG. 1 is a schematic structural diagram of a heating control device for a battery according to an embodiment of the present invention. As shown in FIG. 1 , the battery includes a plurality of stacked cells 1 . The cells 1 are divided into at least three cell groups 2 . The difference in the number of cells 1 between the cell group 2 and the cell group 2 containing the least number of cells 1 is less than or equal to 1, and the heating control device includes at least three heating modules 3 , and the heating module 3 is one with the cell group 2 . A corresponding arrangement, the heating module 3 is used to heat the cells 1 in the corresponding cell group 2 when turned on.

That is, when the number of cells 1 corresponding to the number of heating modules 3 can be divided equally, set the number of cells 1 included in all cell groups 2 to be equal, that is, the difference in the number of cells 1 between any cell group 2 equal to zero. When the number of cells 1 corresponding to the number of heating modules 3 cannot be equally divided, the cell 1 can be divided into multiple cell groups 2 in a uniformity-optimized manner, so that the cell group with the largest number of cells 1 The difference in the number of cells 1 between 2 and the cell group 2 containing the least number of cells 1 is equal to 1.

Fig. 1 exemplarily sets that the battery includes thirteen cells 1, and the heating control device includes four heating modules 3, that is, the number of cells 1 corresponding to the number of heating modules 3 cannot be equally divided, so the battery can be divided into four Cell group 2, heating module 3 and cell group 2 are arranged in one-to-one correspondence, three cell groups 2 can be set to include three cells 1, and one cell group 2 includes a fourth cell 1, including four cells. The cell group 2 of each cell 1 may be, for example, the third cell group 2 along the stacking direction.

Exemplarily, as shown in FIG. 1 , the heating module 3 may be set to include a heating film, and along the stacking direction of the cells 1 , the heating module 3 and the cell group 2 are spaced apart to form an integral part of the heating module 3 and the cell group 2 . A corresponding relationship, FIG. 1 is exemplarily set along the stacking direction of the battery cells 1, and the heating module 3 is located below the corresponding battery cell group 2, that is, it is considered that the heating module 3 heats the upper part of it and is in contact with the heating module 3 when it is turned on. For the set of battery cells 2, the heating module 3 can also be set above the corresponding battery core set 2, that is, it is considered that the heating module 3 heats the battery core set 2 below it and is in contact with the heating module 3 when it is turned on. This is not limited in the embodiment of the present invention, and it is sufficient to ensure that the heating module 3 and the battery cell group 2 have a one-to-one correspondence, so that subsequent algorithm operations can be performed.

As shown in FIG. 1 , the heating control device further includes at least three temperature detection modules. The temperature detection modules are set in a one-to-one correspondence with the cell group 2 , and the temperature detection module is used to detect the real-time temperature of the cell 1 in the corresponding cell group 2 And generate a temperature detection signal. Specifically, the temperature detection module is set in a one-to-one correspondence with the cell group 2, the temperature detection module can obtain a temperature detection value corresponding to each cell group 2, and the temperature detection value detected by the temperature detection module by default is the corresponding cell group. The temperature of each cell 1 in 2, that is, it can be considered that the temperature of all cells 1 in the same cell group 2 is the same for subsequent algorithm operations. It should be noted that the embodiment of the present invention does not limit the relative positional relationship between the temperature detection module and its corresponding battery pack 2, as long as the temperature detection module can detect the temperature of the corresponding battery pack 2, for example, it can be heated correspondingly A temperature detection module is set at the location of the membrane.

The heating control device also includes a control module 5 to correspond to the first switch 6 provided by each heating module 3. The control module 5 is used to adjust the corresponding temperature detection signal through the first switch 6 according to the temperature detection signal fed back by the temperature detection module and the received external power supply signal. the ON state of the heating module 3. Specifically, the different temperature detection signals fed back by the temperature detection module include the temperature of the corresponding cell group 2, and the control module 5 can sort the different cell groups 2 according to the temperature according to the temperature detection signals, and then determine which cell group 2 is the cell group 2 with the lowest temperature, and it is determined whether the temperature of the cell group 2 with the lowest temperature is lower than the set temperature. For the power signal, both the battery and the heating module 3 need external power supply. When the external power signal is a valid external power signal, the control module 5 can determine that the external power supply can provide sufficient power for the battery and the heating module 3 at this time. To sum up, when the control module 5 determines that the temperature of the cell group 2 with the lowest temperature is lower than the set temperature, such as zero degrees, and determines that the external power signal is an effective external power signal, the first switch 6 controls all the heating modules 3 to turn on, That is, all the heating modules 3 are controlled to be turned on, and the heating modules 3 heat the corresponding cell groups 2 .

Exemplarily, before the temperature difference control strategy is started, the control module 5 can control all the heating modules 3 to heat the corresponding cell group 2 with the maximum power through the first switch 6, so that the cell group 2 can heat the corresponding cell group 2 at the fastest speed. The speed is raised to a set temperature, such as zero degrees, in preparation for entering the differential temperature control process.

The control module 5 is further configured to adjust the heating power of the corresponding heating module 3 through the first switch 6 according to the received temperature detection signal to make the temperature difference between the cell group 2 with the highest temperature and the cell group 2 with the smallest temperature Less than or equal to the set difference, for example, the set difference can be zero or a value close to zero, that is, the control module 5 adjusts the power of the corresponding heating module 3 so that the temperature of all the cell groups 2 is the same in the end, or the temperature of all the power cells is the same. The temperature of core group 2 is close.

Exemplarily, the control module 5 can be set to obtain the cell group 2 with the highest temperature according to the received temperature detection signal, and the control module 5 adjusts the pulse adjustment signal output to the first switch 6 of the cell group 2 corresponding to the highest temperature and uses the pulse adjustment signal. The heating power of the heating module 3 corresponding to the cell group 2 with the highest temperature is reduced to the first set heating power, and the control module 5 obtains the cell group 2 with the highest temperature again according to the received temperature detection signal every set time interval.

If the cell group 2 with the highest temperature determined twice before and after is the same cell group 2, the control module 5 adjusts the pulse adjustment signal output to the first switch 6 of the corresponding cell group 2 with the highest temperature and reduces the temperature of the cell group 2 with the highest temperature. The heating power of the heating module 3 corresponding to the core group 2 reaches the second set heating power, and the second set heating power is smaller than the first set heating power. If the cell group 2 with the highest temperature determined twice before and after is a different cell group 2, the control module 5 adjusts the pulse adjustment signal output to the first switch 6 of the cell group 2 corresponding to the current highest temperature and reduces the temperature of the cell group 2 with the highest temperature. The heating power of the heating module 3 corresponding to the cell group 2 reaches the first set heating power, and the heating power of the heating module 3 that was reduced last time is restored to the maximum heating power.

Exemplarily, the pulse adjustment signal may be a PWM (pulse width modulation) signal, that is, the control module 5 obtains the temperature of each cell group 2 through the temperature detection module, and determines which cell group 2 is the cell group 2 with the highest temperature, And determine the heating module 3 corresponding to the cell group 2, by adjusting the pulse adjustment signal output to the corresponding first switch 6, that is, the PWM signal to adjust the proportion of the conduction time of the first switch 6, thereby reducing the corresponding temperature of the highest temperature. The heating power of the heating module 3 of the core group 2 reaches the first set heating power, for example, the heating power is reduced to 50% of the original heating power. Set the time interval, for example, after 3 minutes, the control module 5 re-acquires the temperature of each cell group 2 through the temperature detection module, and determines which cell group 2 is the highest temperature cell group 2 at the current moment, and determines the corresponding cell group 2. The heating module 3 of the cell group 2.

If the cell group 2 with the highest temperature determined twice before and after is the same cell group 2, the control module 5 continues to adjust the aforementioned first switch 6 by adjusting the pulse adjustment signal output to the corresponding first switch 6, that is, the PWM signal Then reduce the heating power of the heating module 3 of the cell group 2 with the highest temperature to the second set heating power, for example, reduce the heating power to 50% of the original heating power and then continue to reduce it by 50% , the remaining heating modules 3 always maintain the maximum heating power during this process.

If the cell group 2 with the highest temperature determined twice before and after is a different cell group 2, the control module 5 determines the heating module 3 corresponding to the cell group 2 with the highest current temperature, and adjusts the output to the corresponding first switch 6 The pulse adjustment signal, that is, the PWM signal adjusts the proportion of the conduction time of the first switch 6, thereby reducing the heating power of the heating module 3 corresponding to the cell group 2 with the highest current temperature to the first set heating power, for example, the heating power It is reduced to 50% of the original heating power, and by adjusting the pulse adjustment signal output to the corresponding first switch 6, that is, the PWM signal, to adjust the corresponding heating module 3 corresponding to the previous heating power reduction to the first set heating power The power of the heating module 3 to the maximum heating power. Repeat the above steps until the control module 5 determines according to the received temperature detection signal that the temperature difference between the cell group 2 with the highest temperature and the cell group 2 with the smallest temperature is less than or equal to the set difference, then the above temperature difference control is ended. process.

In this way, it is beneficial to use the heating module 3 to heat the cells 1 in the battery when the temperature is low, and to start charging the battery when the temperature reaches the rechargeable temperature of the battery, so that the battery can be used in the original low temperature environment. Reduced, the battery can be used in more extreme working conditions, the battery application range is expanded, and the problem of battery damage and irrecoverable caused by charging the battery at low temperature is avoided. At the same time, the temperature feedback mechanism is used. The real-time temperature of the battery continuously adjusts the heating power of the corresponding heating module 3, and finally makes the temperature of all the cells 1 in the battery similar, which greatly improves the consistency of the core temperature, thereby optimizing the consistency of the voltage between the cells 1, slowing down the It reduces the speed of battery decay and prolongs the service life of the battery.

In addition, with respect to each cell 1 in the corresponding battery, a corresponding first switch 6 , a heating module 3 and a temperature detection module are provided, and the first switch 6 , the heating module 3 and the temperature detection module are set in the same way as the cell group 2 . A corresponding arrangement, each battery cell group 2 includes a plurality of battery cells 1, while achieving the above beneficial effects, it is beneficial to reduce the number of the first switch 6, the heating module 3 and the temperature detection module, and reduce the heating control device of the battery. cost.

Optionally, as shown in FIG. 1, the control module 5 can be set to include a heating power signal output terminal A1 and a plurality of pulse adjustment signal output terminals A2, and the control terminal b1 of the first switch 6 is electrically connected to the corresponding pulse adjustment signal output terminal A2. connection, the first end b2 of the first switch 6 is electrically connected to the heating power signal output end A1, the second end b3 of the first switch 6 is electrically connected to the corresponding heating module 3, and the first switch 6 is used to control the terminal b1 according to its The received pulse adjustment signal adjusts the communication time between the first end b2 and the second end b3 to adjust the heating power of the corresponding heating module 3 .

Exemplarily, the first switch 6 may be a MOS tube, the gate of the MOS tube is the control terminal b1 of the first switch 6, the source of the MOS tube is the first terminal b2 of the first switch 6, and the The drain is the second terminal b3 of the first switch 6, and the control module 5 outputs the pulse adjustment signal, that is, the PWM signal, to the control terminal b1 of the first switch 6 through the pulse adjustment signal output terminal A2, and the first switch 6 corresponds to the received During the high and low level period in the pulse adjustment signal, the first end b2 and the second end b3 are connected or disconnected. When the first end b2 and the second end b3 are connected, the control module 5 outputs the output through the heating power signal output end A1 The heating power signal is sent to the corresponding heating module 3 to adjust the heating power of the corresponding heating module 3 by controlling the proportion of the connection time between the first end b2 and the second end b3 of the first switch 6 .

FIG. 2 is a schematic structural diagram of another battery heating control device according to an embodiment of the present invention. On the basis of the heating control device with the structure shown in FIG. 1 , the heating control device shown in FIG. 2 further includes a second switch 7 , and the control module 5 is used to pass the first switch 6 according to the temperature detection signal and the received external power supply signal. The ON state of the heating module 3 corresponding to the second switch 7 is adjusted. Referring to the above-mentioned embodiment, that is, if the control module 5 wants to control whether the heating module 3 is turned on, it needs to control the first switch 6 and the second switch 7 at the same time. 6 and the second switch 7 are both turned on, the heating module 3 is turned on to heat the corresponding cell group 2 .

Optionally, as shown in FIG. 2 , the control module 5 can be set to include a switch control signal output terminal A3, a heating power signal output terminal A1 and a plurality of pulse adjustment signal output terminals A2, and the control terminal b1 of the second switch 7 is connected to the switch control terminal b1. The signal output terminal A3 is electrically connected, the first terminal b2 of the second switch 7 is electrically connected to the heating power signal output terminal A1, the control terminal b1 of the first switch 6 is electrically connected to the corresponding pulse adjustment signal output terminal A2, and all the first switches The first end b2 of the first switch 6 is short-circuited and electrically connected to the second end b3 of the second switch 7, the second end b3 of the first switch 6 is electrically connected to the corresponding heating module 3, and the first switch 6 is used to control the The pulse adjustment signal received by b1 adjusts the communication time between the first end b2 and the second end b3 to adjust the heating power of the corresponding heating module 3 .

Exemplarily, the first switch 6 and the second switch 7 can be both MOS transistors, the gate of the MOS transistor is the control terminal b1 of the corresponding switch, the source of the MOS transistor is the first terminal b2 of the corresponding switch, and the MOS transistor is the first terminal b2 of the corresponding switch. The drain of the tube is the second end b3 of the corresponding switch. The control module 5 adjusts the second switch 7 to be connected or turned off by adjusting the switch control signal output from the switch control signal output end A3 to the control end b1 of the second switch 7. When the two switches 7 are connected, the control module 5 outputs the heating power signal to the first terminals b2 of all the first switches 6 through the heating power signal output terminal A1, and the control module 5 outputs the control module 5 to the first switch 6 through the pulse adjustment signal output terminal A2. The pulse adjustment signal at the terminal b1 is the PWM signal. The first switch 6 corresponds to the high and low level periods in the received pulse adjustment signal. When the second end b3 is connected, the heating power signal is transmitted to the corresponding heating module 3, and the corresponding heating module 3 is heated by controlling the proportion of the connection time between the first end b2 and the second end b3 of the first switch 6. Power regulation.

Optionally, in conjunction with FIG. 1 and FIG. 2 , the heating control device may also include at least three current detection modules, the current detection modules are set in one-to-one correspondence with the heating modules 3 , and the current detection modules are used to detect the real-time current of the corresponding heating module 3 . A current detection signal is generated, and the control module 5 is further configured to adjust the ON state of the heating module 3 through a corresponding switch according to the received current detection signal.

Exemplarily, the current detection module may include a Hall sensor, the current detection module can detect the real-time current of the corresponding heating module 3, and when the heating modules 3 are all turned on, when the control module 5 determines according to the circuit detection signal fed back by the current detection module. When the real-time current of any heating module 3 exceeds the normal current range of the heating module 3, the control module 5 determines that the heating module 3 is faulty, and the control module 5 turns off the corresponding switch, and then turns off all the heating modules 3, corresponding to the structure shown in FIG. 1 . The heating control device, the control module 5 can turn off all the first switches 6 and then turn off all the heating modules 3, corresponding to the heating control device of the structure shown in FIG. 2, the control module 5 can only turn off the second switch 7 and then turn off all the heating control devices The heating module 3 is installed to avoid overheating of the battery cell 1 due to the continuous operation of the heating module 3 and affecting the working performance of the battery.

The embodiment of the present invention also provides a heating control method for a battery. The heating control method can be executed by the battery heating control device of the above embodiment, and can be applied to an application scenario where the heating process of the battery needs to be controlled. FIG. 3 is a schematic flowchart of a heating control method for a battery according to an embodiment of the present invention. As shown in Figure 3, the heating control method of the battery includes:

S110. The temperature detection module detects the real-time temperature of the cells in the corresponding cell group and generates a temperature detection signal.

S120, the control module adjusts the on state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power supply signal.

Optionally, in conjunction with FIG. 1 and FIG. 2 , when the control module 5 determines that the temperature of the cell group 2 with the lowest temperature is less than or equal to the set temperature according to the temperature detection signal, and the received external power signal is an effective external power signal, the A switch 6 controls all heating modules 3 to be turned on. Before the control module 5 adjusts the heating power of the corresponding heating module 3 through the first switch 6 according to the received temperature detection signal, all the heating films heat the corresponding cell group 2 with the maximum power.

Optionally, in conjunction with FIG. 1 and FIG. 2 , when the control module 5 determines that the temperature of the battery cell group 2 with the lowest temperature is greater than or equal to the set temperature according to the temperature detection signal, it controls all the heating modules 3 to turn off through the corresponding switches; or, controls When the module 5 determines that the battery supplies power to the heating modules 3 according to the received external power signal, it controls all the heating modules 3 to turn off through the corresponding switches.

Specifically, when the control module 5 determines, according to the temperature detection signal fed back by the temperature detection module, that the temperature of the battery cell group 2 with the lowest temperature is greater than or equal to the set temperature, and the set temperature is, for example, 5°C, it means that the battery has met the charging conditions at this time. , Turn off the heating film, because the battery also has a certain temperature rise during the charging process, when the heating film is turned off at this time, the temperature of the battery cell will not drop quickly, avoiding the waste of electric energy. . Alternatively, when the control module 5 determines that the temperature difference between the cell with the highest temperature and the cell with the lowest temperature in the battery is greater than 12°C according to the temperature detection signal fed back by the temperature detection module, it means that the battery is abnormal, and the control module 5 can Turn off all the heating modules 3 through the corresponding switches, corresponding to the heating control device shown in FIG. 1 , the control module 5 can turn off all the heating modules 3 by turning off the first switch 6 , corresponding to the heating control device shown in FIG. 2 , control The module 5 can turn off all the heating modules 3 by disconnecting the second switch 7 , so that the process of turning off the heating modules 3 is relatively simple, and all the heating modules 3 can still be turned off when the failure of the first switch 6 is reported.

Or, when the control module 5 determines that the battery supplies power to the heating module 3 according to the received external power signal, for example, it determines that the discharge current is greater than or equal to the current of the heating module 3, the discharge current is the discharge current of the battery, and the pumping current of the heating module 3 is all The sum of the current drawn by the heating module 3, if the former is greater than or equal to the latter, it means that the external power supply no longer supplies power to the heating module 3, or there is an external load that draws current from the battery, based on the principle that the heating module 3 does not draw electricity from the battery , at this time, the control module 5 can turn off all the heating modules 3 through the corresponding switches, corresponding to the heating control device shown in FIG. The heating control device shown, the control module 5 can close all the heating modules 3 by disconnecting the second switch 7, so that the process of closing the heating modules 3 is relatively simple, and can still close all the heating modules when the first switch 6 is faulty. 3.

S130. The control module adjusts the heating power of the corresponding heating module through the first switch according to the received temperature detection signal, so that the temperature difference between the cell group with the highest temperature and the cell group with the smallest temperature is less than or equal to the set difference value .

Optionally, with reference to FIG. 1 and FIG. 2 , the control module 5 obtains the battery cell group 2 with the highest temperature according to the received temperature detection signal. The control module 5 adjusts the pulse adjustment signal output to the first switch 6 of the cell group 2 with the highest temperature and reduces the heating power of the heating module 3 corresponding to the cell group 2 with the highest temperature to the first set heating power. The control module 5 obtains the battery cell group 2 with the highest temperature again according to the received temperature detection signal every set time.

If the cell group 2 with the highest temperature determined twice before and after is the same cell group 2, the control module 5 adjusts the pulse adjustment signal output to the first switch 6 of the corresponding cell group 2 with the highest temperature and reduces the temperature of the cell group 2 with the highest temperature. The heating power of the heating module 3 corresponding to the core group 2 reaches the second set heating power; wherein, the second set heating power is smaller than the first set heating power; if the cell group 2 with the highest temperature determined twice before and after is different For cell group 2, the control module 5 adjusts the pulse adjustment signal output to the first switch 6 of the cell group 2 with the highest current temperature and reduces the heating power of the heating module 3 corresponding to the cell group 2 with the highest temperature to the first Set the heating power, and restore the heating power of the heating module 3 that was reduced last time to the maximum heating power.

The embodiment of the present invention realizes that the battery starts to be charged only when the temperature reaches the rechargeable temperature of the battery, so that the use restriction of the battery in the original low temperature environment is greatly reduced, the battery can be applied in a relatively extreme working condition environment, and the battery application range is expanded. The problem of battery damage and irrecoverable damage caused by charging the battery at low temperature is avoided. In addition, the control module continuously adjusts the heating power of the corresponding heating module according to the feedback real-time temperature of different cell groups, and finally makes the temperature of all cells in the battery similar, which greatly improves the consistency of the cell temperature and optimizes the cell temperature. The consistency of the voltage between them slows down the rate of battery decay and prolongs the service life of the battery.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention. The scope is determined by the scope of the appended claims.

Claims (10)

1. A heating control device for a battery, characterized in that the battery comprises a plurality of battery cells arranged in layers, the battery cells are divided into at least three battery cell groups, and each of the battery cell groups comprises a plurality of battery cells. For the battery cells, the difference in the number of cells between the battery cell group containing the largest number of cells and the battery cell group containing the least number of cells is less than or equal to 1; The heating control device includes: At least three heating modules, the heating modules are arranged in a one-to-one correspondence with the battery cell groups, and the heating modules are used to heat the cells in the corresponding battery cell groups when turned on; At least three temperature detection modules, the temperature detection modules are set in a one-to-one correspondence with the cell groups, and the temperature detection modules are used to detect the real-time temperature of the cells in the corresponding cell group and generate temperature detection Signal; a control module and a first switch corresponding to each of the heating modules, the control module is used to adjust the opening of the corresponding heating module through the first switch according to the temperature detection signal and the received external power supply signal state, and is used to adjust the heating power of the corresponding heating module through the first switch according to the received temperature detection signal to make the difference between the cell group with the largest temperature and the cell group with the smallest temperature The temperature difference between them is less than or equal to the set difference. 2 . The heating control device according to claim 1 , wherein, along the stacking direction of the battery cells, the heating module and the battery cell group are arranged at intervals; 3 . Preferably, the heating module includes a heating film. 3. The heating control device according to claim 1, wherein the control module comprises a heating power signal output terminal and a plurality of pulse adjustment signal output terminals; The control terminal of the first switch is electrically connected to the corresponding pulse adjustment signal output terminal, the first terminal of the first switch is electrically connected to the heating power signal output terminal, and the second terminal of the first switch is electrically connected It is electrically connected with the corresponding heating module, and the first switch is used to adjust the communication time between the first end and the second end according to the pulse adjustment signal received by the control end to adjust the corresponding heating module. heating power. 4. The heating control device according to claim 1, further comprising: A second switch, the control module is configured to adjust the on state of the corresponding heating module through the first switch and the second switch according to the temperature detection signal and the received external power supply signal. 5. The heating control device according to claim 4, wherein the control module comprises a switch control signal output end, a heating power signal output end and a plurality of pulse adjustment signal output ends; The control end of the second switch is electrically connected to the switch control signal output end, and the first end of the second switch is electrically connected to the heating power signal output end; The control terminal of the first switch is electrically connected to the corresponding output terminal of the pulse adjustment signal, the first terminals of all the first switches are short-circuited and are electrically connected to the second terminals of the second switches, and the The second end of a switch is electrically connected to the corresponding heating module, and the first switch is used to adjust the connection time between the first end and the second end according to the pulse adjustment signal received by the control end to adjust the corresponding heating module. The heating power of the heating module. 6. The heating control device according to claim 4 or 5, characterized in that, further comprising: At least three current detection modules, the current detection modules are set in a one-to-one correspondence with the heating modules, and the current detection modules are used to detect the real-time current of the corresponding heating modules and generate a current detection signal; The control module is further configured to adjust the ON state of the heating module through a corresponding switch according to the received current detection signal; Preferably, the current detection module includes a Hall sensor. 7. A battery heating control method, characterized in that, executed by the battery heating control device according to any one of claims 1-6, the battery heating control method comprising: The temperature detection module detects the real-time temperature of the cells in the corresponding cell group and generates a temperature detection signal; The control module adjusts the ON state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power supply signal; The control module adjusts the heating power of the corresponding heating module through the first switch according to the received temperature detection signal, so that there is a difference between the cell group with the highest temperature and the cell group with the smallest temperature The temperature difference is less than or equal to the set difference. 8 . The heating control method according to claim 7 , wherein the control module adjusts the ON state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power signal. 9 . include: When the control module determines, according to the temperature detection signal, that the temperature of the cell group with the lowest temperature is lower than the set temperature and the received external power signal is an effective external power signal, it controls all heating through the first switch. module open; Before the control module adjusts the heating power of the corresponding heating module through the first switch according to the received temperature detection signal, all the heating modules heat the corresponding cell group with the maximum power. 9 . The heating control method according to claim 7 , wherein the control module adjusts the heating power of the corresponding heating module through the first switch according to the received temperature detection signal to maximize the temperature. 10 . The temperature difference between the cell group with the lowest temperature and the cell group with the smallest temperature is less than or equal to the set difference including: The control module obtains the battery cell group with the highest temperature according to the received temperature detection signal; The control module adjusts the pulse adjustment signal output to the first switch of the cell group with the highest temperature and reduces the heating power of the heating module corresponding to the cell group with the highest temperature to a first set heating power; The control module obtains the battery cell group with the highest temperature again according to the received temperature detection signal every set time; If the cell group with the highest temperature determined twice before and after is the same cell group, the control module adjusts the pulse adjustment signal output to the first switch of the cell group corresponding to the highest temperature and reduces the temperature of the cell group with the highest temperature. The heating power of the heating module corresponding to the cell group reaches a second set heating power; wherein, the second set heating power is smaller than the first set heating power; If the cell group with the highest temperature determined twice before and after is a different cell group, the control module adjusts the pulse adjustment signal output to the first switch of the cell group corresponding to the current highest temperature and reduces the maximum temperature The heating power of the heating module corresponding to the battery cell group reaches the first set heating power, and the heating power of the heating module that was reduced last time is restored to the maximum heating power. 10 . The heating control method according to claim 7 , wherein the control module adjusts the ON state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power signal. 11 . Also includes: When the control module determines, according to the temperature detection signal, that the temperature of the battery cell group with the lowest temperature is greater than or equal to the set temperature, it controls all the heating modules to turn off through corresponding switches; or, When the control module determines, according to the received external power signal, that the battery supplies power to the heating modules, it controls all the heating modules to turn off through corresponding switches.

Images