TWI713964B - System and method for equalizing temperatures of battery packs - Google Patents

Abstract

A system and a method for equalizing temperatures of battery packs are provided. The system includes a plurality of battery packs, a plurality of converter circuits, a plurality of processor circuits and a main controller. The battery packs are connected to and stacked on each other. When the main controller compares that a temperature difference between the temperatures of the battery packs is larger than a temperature difference threshold, outputting a reduced current control signal to the processor circuit of the battery pack having a relatively high temperature and an increased current control signal to the processor circuit of the battery pack having a relatively low temperature. The processor circuit instructs the converter circuit to convert a load of the battery pack such that the battery pack outputs a reduced current according to the reduced current control signal, or an increased current according to the increased current control signal.

Description

Battery pack temperature equalization system and method

The present invention relates to a battery pack, and more particularly to a battery pack temperature equalization system and method that enables multiple battery packs to have the same temperature during operation.

Electronic devices that consume more power may need to install more batteries or battery packs encapsulated by multiple batteries. These battery packs are connected in parallel or series, and each battery pack has multiple batteries They are connected in parallel or in series to provide sufficient power to electronic devices. In order to reduce the size of the electronic device, the size of the space for accommodating multiple battery packs in the electronic device is generally roughly the same as the battery size of the battery pack. Therefore, multiple batteries are usually stacked on top of each other when assembled into an electronic device.

It should be noted that the temperature of the battery pack exceeding the tolerable temperature or being at a high temperature for a long time will cause damage to the battery pack, making it necessary to frequently replace the battery pack with a new one. Generally, in actual use, when any one of the multiple battery packs that supply power to the electronic device is damaged, and the electronic device cannot receive sufficient voltage, it usually installs all or all of the battery packs together in the electronic device. Replace the batteries together with another batch of new battery packs. In other words, when some battery packs or batteries are damaged, other battery packs or batteries that can still be used normally need to be replaced together with the damaged battery packs or batteries, which increases the overall cost of the electronic device.

The technical problem to be solved by the present invention is to provide a battery pack temperature equalization system for the shortcomings of the prior art, which includes a plurality of battery packs, a plurality of conversion circuits, a plurality of processing circuits and a main controller. Multiple battery packs are connected to each other and stacked on each other, and each battery pack outputs an initial current in a non-uniform temperature mode. Each battery pack outputs falling current or rising current in the uniform temperature mode. The multiple conversion circuits are respectively connected to multiple battery packs. Each conversion circuit is configured to convert the connected battery pack output down current according to the received down-current processing signal, or convert the connected battery pack output up current according to the received up-current processing signal. The multiple processing circuits are respectively connected to multiple conversion circuits. Each processing circuit outputs a down-current processing signal according to the received down-current control signal, or outputs an up-current processing signal according to the received up-current control signal. The main controller is connected to multiple processing circuits. The main controller is configured to control multiple battery packs to switch from the non-uniform temperature mode to the operation in the uniform temperature mode. The main controller is configured to obtain the temperature of multiple battery packs. When the main controller compares that the temperature difference between the multiple battery packs is greater than the temperature difference threshold, the main controller outputs the down-flow control signal to the processing circuit connected to the battery pack with relatively high temperature among the multiple battery packs, and outputs The up-current control signal is sent to a processing circuit connected to the battery pack with relatively low temperature among the plurality of battery packs.

In addition, the present invention provides a battery pack temperature equalization method, which includes the following steps: stacking and connecting multiple battery packs; using each battery pack to output initial current; configuring a main controller to connect multiple processing circuits, and using the main controller to obtain The temperature of multiple battery packs; use the main controller to compare whether the temperature difference between the battery packs is greater than the temperature difference threshold, if so, use the main controller to output the down-flow control signal to the temperature that is relatively high in the multiple battery packs The processing circuit connected to the battery pack, and output an up-flow control signal to the processing circuit connected to the relatively low temperature of the multiple battery packs, if not, maintain the initial current output of each battery pack; use each processing circuit according to the received The down-current control signal outputs a down-current processing signal, or outputs an up-current processing signal according to the received up-current control signal; and multiple conversion circuits are configured to connect multiple processing circuits and multiple battery packs, and each conversion circuit is used to receive The received down-current processing signal converts the connected battery pack output down current, or according to The received up-current processing signal converts the connected battery pack to output up-current.

As described above, the present invention provides a battery pack temperature equalization system and method. When the temperature difference between multiple battery packs that can be stacked on each other is too large, the load reduction operation is performed on the battery pack with a higher temperature, so that the temperature is relatively low. The power supplied by the high battery pack decreases, so that the temperature of the battery pack gradually drops, and at the same time, the battery pack with a lower temperature can be upgraded, so that the battery pack with a lower temperature can supply more power, which will not affect Under the total power supply of multiple battery packs, all battery packs are adjusted to have the same temperature and the health value of all batteries is averaged, so that multiple batteries are damaged at almost the same time point, extending the overall life of the battery pack.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings about the present invention. However, the provided drawings are only for reference and description, and are not used to limit the present invention.

BP1~BPn: battery pack

B1~B6: battery

It, It1, It2, It3, Itn: initial current

C1~Cn: Conversion circuit

Id, Id1, Id2: falling current

Ir, Irn: rising current

M1~Mn: Processing circuit

MIDS, MIDS1, MIDS2: Downstream processing signal

MIRS, MIRSS2, MIRSn: Upstream processing signal

TC: main controller

TDH: temperature difference threshold

CIDS, CIDS1, CIDS2, CIDSS1: Downflow control signal

CIRS, CIRSS2, CIRSn: Upflow control signal

S1~S3, SS1~SSn: temperature sensor

SE1~SE3: temperature sensing signal

R1, R2, R: output load

BN(1)t, BN(2)t, BN(3)t, BA(1)t, BA(2)t, BA(3)t, BN(1)i, BN(2)i, BN( 3) i, BA(1)i, BA(2)i, BA(3)i: curve

S501~S523, S601~S619, S701~S717: steps

FIG. 1A is a block diagram of multiple battery packs stacked on each other in the battery pack temperature equalization system of the first embodiment of the present invention.

FIG. 1B is a block diagram of the battery pack temperature equalization system according to the first embodiment of the present invention.

2A is a graph of temperature versus time of multiple battery packs in the non-uniform temperature mode of the battery pack temperature equalization system of the first embodiment of the present invention.

2B is a graph of current versus time of multiple battery packs in the non-uniform temperature mode of the battery pack temperature equalization system of the first embodiment of the present invention.

2C is a graph of temperature versus time of multiple battery packs in the temperature equalization mode of the battery pack temperature equalization system of the first embodiment of the present invention.

2D is a graph of current versus time of multiple battery packs in the temperature equalization mode of the battery pack temperature equalization system of the first embodiment of the present invention.

3A is a block diagram of multiple battery packs stacked on each other in the battery pack temperature equalization system of the second embodiment of the present invention.

3B is a block diagram of the battery pack temperature equalization system according to the second embodiment of the present invention.

4A is a block diagram of a plurality of battery packs stacked on each other in the battery pack temperature equalization system of the third embodiment of the present invention.

4B is a block diagram of a battery pack temperature equalization system according to the third embodiment of the present invention.

FIG. 5 is a flowchart of steps of a method for uniforming temperature of a battery pack according to a fourth embodiment of the present invention.

FIG. 6 is a flowchart of the steps of a method for uniforming temperature of a battery pack according to a fifth embodiment of the present invention.

FIG. 7 is a flowchart of the steps of a method for uniforming temperature of a battery pack according to a sixth embodiment of the present invention.

The following are specific specific examples to illustrate the related implementations disclosed in the present invention, and those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are merely schematic illustrations, and are not drawn according to actual dimensions, and are stated in advance. The following embodiments will further describe the related technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention.

It should be understood that although terms such as “first”, “second”, and “third” may be used herein to describe various elements or signals, these elements or signals should not be limited by these terms. These terms are mainly used to distinguish one element from another, or one signal from another signal. In addition, the term "or" used in this article should, depending on the actual situation, possibly include any one or a combination of more of the associated listed items.

[First Embodiment]

Please refer to FIGS. 1A and 1B. FIG. 1A is a block diagram of multiple battery packs stacked on each other in the battery pack temperature equalization system of the first embodiment of the present invention; FIG. 1B is the battery pack temperature equalization system of the first embodiment of the present invention Block diagram. As shown in Figure 1B, the battery pack temperature equalization system of this embodiment includes multiple battery packs BP1~BP3, multiple conversion circuits C1~C3, multiple processing circuits M1~M3, temperature sensors S1~S3, and a main control器TC.

In this embodiment, when a plurality of battery packs BP1 to BP3 connected in parallel supply current with the same current value, the plurality of battery packs BP1 to BP3 operate in a non-uniform temperature mode. For example, when the temperature of any battery pack of the battery packs BP1~BP3 is different from each other, the battery packs BP1~BP3 are controlled to supply currents with different current values, so that the battery packs BP1~BP3 will operate at a uniform temperature. Mode, the following is a more detailed description.

As shown in FIG. 1A, multiple battery packs BP1 to BP3 are usually stacked on top of each other when they are installed in the battery accommodating space of the same electronic device. The battery pack BP1~BP3 will generate hot air during the power supply process, and the hot air will flow upward due to physical phenomena. As a result, the battery pack BP1 stacked in the uppermost layer among the plurality of battery packs BP1~BP3 has a relatively high temperature, while the battery pack BP3 stacked in the lowermost layer among the plurality of battery packs BP1~BP3 has a relatively low temperature. , And the temperature of the battery pack BP2 is between the temperature of the battery pack BP3 and the temperature of the battery pack BP1, expressed as T1>T2>T3, where T1 is the temperature of the battery pack BP1 and T2 is the temperature of the battery pack BP2 , T3 is the temperature of the battery pack BP3.

It should be noted that, in order to clearly show the configuration relationship between the multiple battery packs BP1~BP3 and the temperature control device, the distance between the multiple battery packs BP1~BP3 shown in Figure 2B is compared with that shown in Figure 2A. It is exaggerated.

In this embodiment, a set of temperature control devices is configured for each of the multiple battery packs BP1 to BP3 connected in parallel. As shown in FIG. 2B, the battery pack BP1 is connected to the conversion circuit C1 and the temperature sensor S1, and the conversion circuit C1 and the temperature sensor S1 are connected to the processing circuit M1. In other words, the temperature sensor S1 can be disposed between the battery pack BP1 and the processing circuit M1.

Another battery pack BP2 is connected to the conversion circuit C2 and the temperature sensor S2, and the conversion circuit C2 and the temperature sensor S2 are connected to the processing circuit M2. In other words, the temperature sensor S2 may be disposed between the battery pack BP2 and the processing circuit M2. Another battery pack BP3 is connected to the conversion circuit C3 and the temperature sensor S3, and the conversion circuit C3 and the temperature sensor S3 are connected to the processing circuit M3. In other words, the temperature sensor S3 may be disposed between the battery pack BP3 and the processing circuit M3. The main controller TC is connected to the processing circuits M1, M2, and M3 corresponding to the battery packs BP1 to BP3, respectively.

It is assumed that the unused battery packs BP1 to BP3 have the same characteristics, such as the same power supply voltage and the same load. When the battery packs BP1 to BP3 connected in parallel start to supply power, the battery packs BP1 to BP3 all supply an initial current It with the same current value to the electronic device. The temperature of the battery packs BP1 to BP3 will gradually increase as the time for supplying the initial current It increases. Due to the stacking configuration of the battery packs BP1~BP3, the battery packs BP1~BP3 are operating in the non-uniform temperature mode at this time, that is, the temperature of the battery packs BP1~BP3 is different from each other, especially, the battery pack BP1 stacked on the top layer has Relatively high temperature.

While the battery packs BP1 to BP3 are supplying power, the temperature sensor S1 continues to sense the temperature of the battery pack BP1, the sensor S2 continues to sense the temperature of the battery pack BP2, and the sensor S3 continues to sense the temperature of the battery pack BP3.

The temperature sensor S1 can output a corresponding temperature sensing signal SE1 to the processing circuit M1 according to the temperature of the battery pack BP1, and transmit it to the main controller TC through the processing circuit M1. The temperature sensor S2 can output a corresponding temperature sensing signal SE2 to the processing circuit M2 according to the temperature of the battery pack BP2, and transmit it to the main controller TC through the processing circuit M2. The temperature sensor S3 can output a corresponding temperature sensing signal SE3 to the processing circuit M3 according to the temperature of the battery pack BP3, and transmit it to the main controller TC through the processing circuit M3.

The main controller TC can obtain the temperature of the battery pack BP1~BP3 from the processing circuits M1~M3, respectively. The main controller TC can then compare the temperature difference between the temperatures of the battery packs BP1~BP3, that is, compare The temperature difference between the battery pack BP1 and the battery pack BP2, the temperature difference between the battery pack BP2 and the battery pack BP3, and the temperature difference between the battery pack BP1 and the battery pack BP3 are calculated. It is worth noting that when the main controller TC compares any temperature difference between the multiple battery packs BP1~BP3 to be greater than the temperature difference threshold TDH, the main controller TC controls the multiple battery packs BP1~BP3 from the non-uniform temperature mode Switch to operating in uniform temperature mode.

Specifically, the main controller TC outputs the down-flow control signal CIDS to the processing circuit M1 connected to the battery pack BP1 with a relatively high temperature among the battery packs BP1 to BP3. In addition, the main controller TC outputs the up-flow control signal CIRS to the processing circuit M3 connected to the battery pack BP3 with a relatively low temperature among the battery packs BP3.

Then, the processing circuit M1 outputs the corresponding down-current processing signal MIDS to the conversion circuit C1 connected to the battery pack BP1 according to the down-current control signal CIDS received from the main controller TC. On the other hand, the processing circuit M3 outputs the corresponding up-flow processing signal MIRS to the conversion circuit C3 connected to the battery pack BP3 according to the up-flow control signal CIRS received from the main controller TC.

The conversion circuit C1 converts the connected battery pack BP1 according to the received down-current processing signal MIDS, so that the battery pack BP1 is converted to output the down current Id instead of the initial current It. On the other hand, the conversion circuit C3 converts the connected battery pack BP3 according to the received up-current processing signal MIRS, so that the battery pack BP1 is converted to output a rising current Ir instead of the initial current It.

For example, the conversion circuit C1 reduces the load of the battery pack C1 in the high temperature area, so that the battery pack BP1 is converted to supply a falling current Id that is less than the initial current It. At the same time, the conversion circuit C1 increases the load of the battery pack C3 in the low temperature area, so that the battery pack BP3 is converted to supply a rising current Ir that is greater than the initial current It.

In order to make the total supply current of the battery packs BP1~BP3 operating in the equal temperature mode the same as the total supply current of the battery packs BP1~BP3 operating in the non-equal temperature mode, the electronic devices receiving the battery packs BP1~BP3 can receive enough And the stable voltage keeps normal operation. Therefore, in this embodiment, the initial current It of the relatively low temperature battery pack BP3 is adjusted to the adjustment range of the rising current Ir (ie The difference between the rising current Ir and the initial current It) is equal to/depending on the adjustment range of the initial current It of the relatively high temperature battery pack BP1 adjusted to the falling current Id (that is, the difference between the falling current Id and the initial current It).

In this way, in the non-uniform temperature mode, the multiple initial currents It outputted by the multiple battery packs BP1 to BP3 are respectively output. The total current value of the total current is equal to the falling current Id and the battery output of the battery pack BP1 in the uniform temperature mode. The total current value of the rising current Ir output by the group BP3 in the uniform temperature mode and the initial current It output by the battery group BP2 in the uniform temperature mode plus the total current.

Furthermore, the adjustment range of the current supplied by the battery packs BP1 to BP3 may depend on the target temperature of the battery packs BP1 to BP3 operating in the uniform temperature mode. For example, the target temperature of the battery pack BP1 to BP3 in the uniform temperature mode may be equal to the temperature of the battery pack BP2 in the non-uniform temperature mode. When the temperature difference between multiple battery packs BP1~BP3 is greater than the temperature difference threshold TDH, the main controller TC uses the temperature of the battery pack BP2 with the temperature in the middle value (ie stacked in the middle layer) among the multiple battery packs BP1~BP3. As a reference temperature for adjustment.

The main controller TC compares the temperature of the other battery packs BP1 and BP3 with the adjustment reference temperature (that is, the temperature of the battery pack BP2 in the non-uniform temperature mode and the uniform temperature mode), and determines the temperature of the battery pack BP1, BP3 accordingly. The current adjustment range is to output the corresponding down-current control signal CIDS to the battery pack BP1 and output the up-current control signal CIRS to the battery pack BP3, so that in the equalizing mode, the temperature of each battery pack BP1~BP3 is the same, that is, both Equal to adjust the reference temperature.

That is, in this embodiment, the conversion circuit C2 connected to the battery pack BP2 with the intermediate temperature value does not perform the conversion of the initial current It, so that the battery pack BP2 whose temperature is at the intermediate value among the plurality of battery packs BP1 to BP3 The temperature outputs the initial current It in both the uniform temperature mode and the non-uniform temperature mode.

However, it should be understood that the adjusted reference temperature is not limited to the temperature of the battery pack BP2 whose temperature is at an intermediate value among the plurality of battery packs BP1 to BP3. In fact, the adjusted reference temperature can be replaced with a preset stored in the main controller TC in advance. Temperature value. In this case, when the main controller TC compares multiple battery packs Any temperature difference between BP1~BP3 is greater than the temperature difference threshold TDH, and then the temperature of any one of the battery packs BP1~BP3 is not equal to the preset temperature value, the main controller TC controls the processing circuit M1 as described above ~M3 respectively instructs the conversion circuits C1~C3 to respectively convert the current output by the battery pack BP1~BP3 whose temperature is not equal to the preset temperature value.

Please refer to FIGS. 2A and 2B. FIG. 2A is a graph of temperature versus time of a plurality of battery packs in the non-uniform temperature mode of the battery pack temperature equalization system of the first embodiment of the present invention; FIG. 2B is the first embodiment of the present invention The graph of the current versus time of multiple battery packs in the uniform temperature mode of the battery pack non-uniform temperature system of the example.

As shown in Figure 2B, BN(1)i represents the current versus time curve supplied by the battery pack BP1 in the non-uniform temperature mode, and BN(2)i represents the current versus time supplied by the battery pack BP2 in the non-uniform temperature mode. The curve, BN(3)i represents the curve of the current supplied by the battery pack BP3 in the non-uniform temperature mode versus time. Accordingly, in the non-uniform temperature mode, the battery packs BP1 to BP3 with the same characteristics supply the same initial current It.

As shown in Figure 2A, BN(1)t represents the temperature versus time curve of the battery pack BP1 in the non-uniform temperature mode, and BN(2)t represents the temperature versus time curve of the battery pack BP2 in the non-uniform temperature mode, BN(3)t represents the temperature versus time curve of the battery pack BP3 in the non-uniform temperature mode. Accordingly, the temperature of the battery pack BP1~BP3 will increase with time. When the battery packs BP1~BP3 supply the same current, the temperature relationship between the battery packs BP1~BP3 depends on the stacking method of the battery packs BP1~BP3, and the battery pack BP1 stacked on the top has the relatively highest temperature. , The battery pack BP3 stacked at the bottom has the relatively lowest temperature.

Please refer to FIGS. 2C and 2D. FIG. 2C is a graph of temperature versus time of multiple battery packs in the temperature equalization mode of the battery pack temperature equalization system according to the first embodiment of the present invention; FIG. 2D is the first embodiment of the present invention The curve diagram of current versus time of multiple battery packs in the uniform temperature mode of the battery pack temperature system.

As shown in Figure 2D, BA(1)i represents the curve of the current supplied by the battery pack BP1 in the temperature equalization mode versus time, and BA(2)i represents the curve of the current supplied by the battery pack BP2 in the temperature equalization mode against time The line, BA(3)i represents the curve of the current supplied by the battery pack BP3 in the uniform temperature mode versus time. After the load reduction operation is performed, the output current of the battery pack BP1 drops. After the load increase operation is performed, the output current of the battery pack BP3 increases. The load of the battery pack BP2 is not adjusted, so the output current does not change.

Thus, as shown in Figure 2C, BA(1)t, BA(2)t, BA(3)t respectively represent the temperature versus time curve of the battery pack BP1~BP3 in the uniform temperature mode. After a period of time after the load reduction operation, the temperature of the battery pack BP1~BP3 will gradually become the same.

For example, before the load is adjusted, that is, when the battery packs BP1~BP3 shown in FIG. 1 are operated in the non-uniform temperature mode, the output currents of the battery packs BP1~BP3 are the same, for example, 10A, and the battery pack BP1 The temperature relationship of ~BP3 is: the temperature of the battery pack BP1, for example, 45°C> the temperature of the battery pack BP2, for example, 35°C, the temperature of the battery pack BP3, for example, 25°C.

After the load-up and load-down operations, when the battery packs BP1~BP3 are operated in the uniform temperature mode, the output current relationship of the battery packs BP1~BP3 is: the output current of the battery pack BP3, for example, 15A> the output current of the battery pack BP2 For example, 10A>the output current of the battery pack BP1 is, for example, 5A, and the temperature of the battery packs BP1 to BP3 are the same as each other, for example, 35°C.

[Second Embodiment]

Please refer to FIGS. 3A and 3B. FIG. 3A is a block diagram of a stack of multiple battery packs of a battery pack temperature equalization system according to a second embodiment of the present invention; FIG. 3B is a block diagram of a battery pack temperature equalization system of the second embodiment of the present invention Block diagram. As shown in FIG. 3B, the battery pack temperature equalization system of this embodiment includes a plurality of battery packs BP1~BPn, a plurality of conversion circuits C1~Cn, a plurality of processing circuits M1~Mn, and a main controller TC. The processing circuits M1 to Mn are connected to the battery packs BP1 to BPn, the conversion circuits C1 to Cn, and the main controller TC.

As shown in FIG. 3A, n battery packs BP1~BPn are stacked on each other, and the number of battery packs BP1~BPn and the number of batteries included in each battery pack BP1~BPn may depend on the power consumption of the electronic device. The number of conversion circuits C1~Cn and processing circuits M1~Mn can depend on the use of electronic devices. The number of battery packs BP1~BPn used. That is, in this embodiment, the number of the battery packs BP1~BPn, the conversion circuits C1~Cn, and the processing circuits M1~Mn are the same (all n) to achieve individual control of the battery packs BP1~BPn. However, in implementation, part or all of the battery packs BP1 BPn may also share the same conversion circuit C1 ˜Cn and the processing circuit M1 ˜Mn.

It should be noted that, in order to clearly show the configuration relationship between the multiple battery packs BP1~BP3 and the temperature control device, the distance between the multiple battery packs BP1~BP3 shown in Figure 3B is compared with that shown in FIG. 3A It is exaggerated.

The difference from the first embodiment is that the sensor S1 in the first embodiment is arranged between the battery pack BP1 and the processing circuit M1, and the sensor S2 is arranged between the battery pack BP2 and the processing circuit M2, and the sensor The sensor S3 is arranged between the battery pack BP3 and the processing circuit M3, but in this embodiment, in order to save the space of the electronic device occupied by the battery pack temperature equalization system, the sensors S1~Sn are respectively arranged inside the processing circuit M1~Mn.

It is worth noting that in the first embodiment, the number of battery packs BP1 to BP3 is an odd number, and the temperatures of the battery packs BP1 to BP3 are different from each other between performing load-up and load-down operations, except for stacking in the middle layer Except that the output current of one battery pack BP2 is not adjusted, the output currents of the other battery packs BP1 and BP3 are all adjusted. However, in this embodiment, the number of battery packs BP1 to BPn may be even or odd, that is, the number of battery packs BP1 to BPn in the middle layer may be more than one.

Furthermore, assuming that n battery packs BP1~BPn stacked on top of each other supply the same initial current It1~Itn, according to the physical phenomenon of the upward flow of heat, the temperature of the battery pack BP1~BPn may be: battery pack BP1 The temperature of the battery pack BP2> the temperature of the battery pack BP3> the temperature of the battery pack BPn-1> the temperature of the battery pack BPn. However, the n battery packs BP1 to BPn stacked on each other may have different characteristics, such as having loads of the same or different sizes, and can supply initial currents It1 to Itn of different sizes.

As a result, in fact, the temperature of adjacent battery packs in the battery packs BP1 to BPn, such as the battery packs of two or more layers in the middle, may be the same. Therefore, in this embodiment, the temperature of more than one battery pack in the battery packs BP1 to BPn may not need to be adjusted, that is, the output current of more than one battery pack may not need to be adjusted.

Specifically, the processing circuits M1 to Mn can respectively sense the temperature of the battery packs BP1 to BPn through the internal sensors S1 to Sn. The main controller TC obtains the temperature of the battery pack BP1~BPn from the processing circuit M1~Mn, compares the temperature of the battery pack BP1~BPn, and sorts and classifies the battery pack BP1~BPn according to the temperature of the battery pack BP1~BPn.

When the main controller TC compares and finds that the temperatures of the battery packs BP1~BPn are all different, the main controller TC can determine which one or more of the battery packs BP1~BPn has an intermediate temperature value, that is, the temperature is greater than the intermediate temperature value. The number of other battery packs with a temperature value is the same as the number of other battery packs with a temperature lower than the intermediate temperature value. The main controller TC can determine the intermediate temperature value or the preset temperature value as the adjustment reference temperature, and control the processing circuit M1~Mn to instruct the conversion circuit C1~Cn to respectively convert the load of the battery pack BP1~BPn, such as load up or down , If the intermediate temperature value is used as the adjustment reference temperature, the battery pack with the intermediate temperature value does not need to adjust the load size.

In this way, before the load is adjusted, the battery packs BP1~BPn respectively output initial currents It1~Itn with the same current value, and after the load is adjusted, the battery packs BP1~BPn respectively output currents with different current values such as falling currents Id1, Id2, etc., or rising current Irn, etc., in which the battery pack BP3 (or more battery packs) that has not adjusted the load keeps outputting the initial current It3, etc. Finally, the operating temperatures of the battery packs BP1 to BPn are all the same to achieve the effect of uniform temperature of the battery packs.

Please refer to FIGS. 4A and 4B. FIG. 4A is a block diagram of a stack of multiple battery packs in a battery pack temperature equalization system according to a third embodiment of the present invention; FIG. 4B is a block diagram of a battery pack temperature equalization system according to the third embodiment of the present invention Block diagram. As shown in FIG. 4B, the battery pack temperature equalization system of this embodiment includes a plurality of batteries BP1, BP2 and a main controller TC. The battery pack BP1 includes a plurality of batteries B1 to B3, and the battery pack BP2 Contains multiple batteries B4~B6. In addition, depending on the number of all batteries B1 to B6 in all battery packs BP1, the battery pack temperature equalization system further includes multiple conversion circuits C1 to C6 and multiple processing circuits M1 to M6. The multiple processing circuits M1 to M6 are respectively connected to the multiple conversion circuits C1 to C6 and to the main controller TC. The plurality of conversion circuits C1 to C6 are respectively connected to the plurality of batteries B1 to B6.

The first embodiment and the second embodiment both adjust the overall temperature of the battery packs stacked on each other, but in fact, except for the battery packs stacked on each other. According to usage requirements, such as the configuration of the space for accommodating the battery pack in the electronic device, multiple batteries of different battery packs may also be stacked on each other, or multiple batteries contained in the same battery pack may also be stacked on each other.

As shown in FIG. 4B, the battery pack BP1 is connected in parallel to the battery pack BP2. The batteries B1 to B3 of the battery pack BP1 are connected in series with each other. The batteries B4 to B6 of the battery pack BP2 are connected in series. As shown in FIG. 4A, in order to reduce the volume of the electronic device incorporating the batteries B1 to B6, the batteries B1 to B3 of the battery pack BP1 are stacked on each other, and the batteries B4 to B6 of the battery pack BP2 are stacked on each other. It should be noted that, in order to clearly show the configuration relationship between the multiple batteries B1~B6 and the temperature control device, the distance between the multiple batteries B1~B6 as shown in Figure 4B is exaggerated compared to that shown in Figure 4A. Illustrated.

It should be understood that different battery packs on the market have different battery packaging methods. In this embodiment, it is assumed that the packaging of the battery packs BP1 and BP2 can be used by the sensor to sense the temperature of each battery B1~B6 and output to the main controller TC through the transmission circuits M1~M6 respectively. The sensors can be arranged inside the processing circuits M1 to M6 or additionally arranged as described above. In this embodiment, for example, a plurality of sensors are arranged in the plurality of conversion circuits C1 to C6, but the invention is not limited thereto.

For example, the sensor can sense the temperature of the positive terminal or the negative terminal of the batteries B4 to B6, and the temperature measurement points of the batteries B4 to B6 can be changed according to actual requirements. In fact, multiple batteries B1 to B3 of the same battery group BP1 or multiple batteries B4 to B6 of the same battery group BP2 can share the same processing circuit and the same conversion circuit.

As shown in FIG. 4B, the batteries B1 to B3 of the battery pack BP1 are connected in series. If battery B1~B3 If the batteries are the same (for example, the same model) and have the same load with each other, the voltages supplied by the batteries B1 to B3 are basically the same.

However, before the load adjustment is performed, the temperature of the batteries B1~B3 of the battery pack BP1 measured by the sensor on the upper layer is higher, that is, the temperature of battery B1>the temperature of battery B2>the temperature of battery B3 . In addition, the temperature of the battery B4 in the battery pack BP2 measured by the sensor>the temperature of the battery B5>the temperature of the battery B6.

After the main controller TC obtains the temperatures of all batteries B1 to B6, the main controller TC can compare the temperature of each battery B1 to B6 with the temperature threshold value. For example, when the main controller TC determines that the temperature of any one of the batteries B1~B3 of the mutual battery pack BP1 is greater than the temperature threshold and the temperature difference with the temperature threshold is greater than the temperature difference threshold, the main controller TC can output an upflow The control signal CIRSS2 is connected to the processing circuit M2 of the battery pack BP2 whose temperature is lower than that of the battery pack BP1. The processing circuit M2 outputs a corresponding up-current processing signal MIRSS2 according to the up-current control signal CIRSS2 to instruct the conversion circuit C2 to control the battery pack BP2 to perform an up-load operation to increase the power supply current of the battery pack BP2.

It is worth noting that as the supply current of the battery pack BP1 increases, the overall supply current of all the battery packs BP1 and BP2 increases. In order to keep the supply current of the whole circuit constant and reduce the operating temperature of the battery pack BP1, the main controller TC can be based on the increase in the load of the battery pack BP2 and the temperature between the batteries B1~B3 of the battery pack BP1. The temperature relationship and the difference with the temperature threshold value, output the down-current control signal CIDSS1 to the processing circuit M1 to control the processing circuit M1 to output the down-current processing signal MIDSS1 to indicate that the conversion circuit C1 controls the battery pack BP1 to supply a smaller current as a whole , The operating temperature of the battery pack BP1 drops.

In this way, the total supply current value of the battery pack BP1 and the battery pack BP2 can be kept unchanged, the same and sufficient current can be maintained to supply the electronic device, and the battery pack BP1 and the battery pack BP2 connected in parallel can have the same temperature.

[Third Embodiment]

Please refer to FIG. 5, which is a flowchart of the steps of the method for uniforming the temperature of the battery pack according to the fourth embodiment of the present invention. As shown in the figure, the battery pack temperature equalization system of this embodiment includes the following steps S501 to S523.

Step S501: Stack multiple battery packs on each other and connect to each other.

Step S503: Use the battery pack to output the initial current.

Step S505: Configure the main controller to connect to multiple processing circuits, and use the main controller to obtain the temperatures of multiple battery packs.

Step S507: Use the main controller to compare whether the temperature difference between the battery packs is greater than the temperature difference threshold, if not, execute step S503, if yes, execute steps S509 to S523 in sequence.

Step S509: Use the main controller to compare the battery packs with relatively low temperature among the plurality of battery packs.

Step S511: Utilize the main controller to output the up-current control signal to the processing circuit connected to the battery pack with relatively low temperature among the plurality of battery packs.

Step S513: Utilize the processing circuit to output the up-current processing signal to a conversion circuit connected to the battery pack with a relatively low temperature according to the up-current control signal received from the main controller.

Step S515: Use the conversion circuit to convert the initial current of the connected battery pack to the rising current according to the up-current processing signal received from the connected processing circuit. For example, the battery pack with a relatively low temperature is subjected to load-up operation to make the battery pack The group output current value increases.

Step S517: Use the main controller to compare the battery packs with relatively high temperature among the plurality of battery packs.

Step S519: Utilize the main controller to output the down-flow control signal to the processing circuit connected to the battery pack with relatively high temperature among the battery packs.

Step S521: Utilize the processing circuit to output the down-current processing signal to the conversion circuit connected to the battery pack with relatively high temperature according to the down-current control signal received from the main controller.

Step S523: Use the conversion circuit to convert the connected electrical signals according to the down-current processing signal. The initial current of the battery pack is a decreasing current. For example, a relatively high temperature battery pack is subjected to a load reduction operation to reduce the output current value of the battery pack, thereby causing the temperature of the battery pack to gradually drop over time. In this way, the total current supplied by all the battery packs is kept unchanged, so that the temperature of all the battery packs is the same, and the effect of uniforming the temperature of the battery packs is achieved.

[Fourth Embodiment]

Please refer to FIG. 6, which is a flowchart of the steps of the method for uniforming the temperature of the battery pack according to the fifth embodiment of the present invention. As shown in the figure, the battery pack temperature equalization system of this embodiment includes the following steps S601 to S619.

Step S601: Stack multiple battery packs on each other and connect them in parallel.

Step S603: Utilize multiple battery packs to output the same initial current respectively.

Step S605: multiple sensors are configured, and the multiple sensors are used to respectively sense the temperature of multiple battery packs.

Step S607: Use the main controller to obtain the temperatures of the multiple battery packs from the multiple sensors, and compare whether the temperature difference between the multiple battery packs is greater than the temperature difference threshold, if not, execute step S603, if yes, execute step S609.

Step S609: Use the main controller to compare the battery packs with an intermediate temperature value among the multiple battery packs, and use the temperature of the battery pack with the intermediate temperature value as the adjustment reference temperature.

Step S611: Use the main controller to compare other battery packs, that is, whether the temperature of the upper battery pack or the lower battery pack of the battery pack stacked in the middle layer is lower than the regulation reference temperature of the battery pack in the middle layer, if not, execute sequentially Steps S613 and S615, if yes, execute steps S617 and S619.

Step S613: Utilize the main controller to output the down-current control signal to control the processing circuit to output the down-current processing signal to the conversion circuit of the battery pack with relatively high temperature (ie, the battery pack stacked on the upper layer of the battery pack in the middle layer).

Step S615: Use the conversion circuit to compare the upper battery pack, that is, the battery in the high temperature zone The group performs load reduction operations to convert the battery pack to output a reduced current, so that the temperature of the battery pack gradually decreases, and the temperature of the upper battery pack becomes the same as the temperature of the middle battery pack.

Step S617: Utilize the main controller to output the up-current control signal to control the processing circuit to output the up-current processing signal to the conversion circuit of the battery pack with relatively low temperature (ie, the battery pack stacked on the lower layer of the battery pack in the middle layer).

Step S619: Use the conversion circuit to perform the lifting operation on the battery pack in the lower layer, that is, the battery pack in the low temperature zone, so that the battery pack is converted to output rising current, so that the temperature of the lower battery pack gradually rises, so that the lower battery pack The temperature becomes the same as the temperature of the battery pack in the middle layer.

[Fifth Embodiment]

Please refer to FIG. 7, which is a flowchart of the steps of the method for uniforming the temperature of the battery pack according to the sixth embodiment of the present invention. As shown in the figure, the battery pack temperature uniformity method of this embodiment includes the following steps S701 to S717.

Step S701: Stack multiple battery packs on each other and connect them in parallel.

Step S703: Utilize multiple battery packs to respectively output the same initial current.

Step S705: Configure multiple sensors, and use the multiple sensors to sense the temperature of the multiple battery packs.

Step S707: Use the main controller to obtain the temperature of multiple battery packs from multiple sensors, and compare whether the temperature of each battery pack is equal to the temperature threshold or the temperature preset value, if yes, go to step S703, if not, Step S709 is executed.

Step S709: Use the main controller to calculate the difference between the temperature of the battery pack and the temperature threshold to determine the current adjustment range.

Step S711: Utilize the main controller to output the up-current control signal to control the processing circuit to output the up-current processing signal to the conversion circuit of the battery pack with a relatively low temperature.

Step S713: Use the conversion circuit to perform load-up operations on the battery pack in the low-temperature area, so that the battery pack with a lower temperature can output a rising current, so that the temperature of the battery pack rises to, for example, the temperature Threshold/temperature preset value.

Step S715: Utilize the main controller to output the down-current control signal to control the processing circuit to output the down-current processing signal to the conversion circuit of the battery pack with relatively high temperature.

Step S717: Use the conversion circuit to perform a load reduction operation on the battery pack in the high temperature zone, so that the battery pack outputs a reduced current, so that the temperature of the battery pack drops to, for example, a temperature threshold value/temperature preset value.

[Beneficial effects of the embodiment]

One of the beneficial effects of the present invention is that the battery pack temperature equalization system and method provided by the present invention perform load reduction on a battery pack with a higher temperature when the temperature difference between a plurality of battery packs that can be stacked is too large The operation reduces the power supply of the battery pack with a higher temperature, so that the temperature of the battery pack gradually decreases, and at the same time, the battery pack with a lower temperature can be upgraded to make the battery pack with a lower temperature supply more power. In this way, without affecting the total power supply of multiple battery packs, all battery packs are adjusted to have the same temperature, and the health value of all batteries is averaged, so that multiple batteries are damaged at almost the same time, and the entire battery pack is extended. Life.

The content disclosed above is only a preferred and feasible embodiment of the present invention, and does not limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the description and schematic content of the present invention are included in the application of the present invention. Within the scope of the patent.

BP1~BPn: battery pack

C1~Cn: Conversion circuit

It1~Itn: initial current

Id1, Id2: falling current

Irn: rising current

M1~Mn: Processing circuit

MIDS1, MIDS2: Downstream processing signal

MIRSn: Upstream processing signal

TC: main controller

TDH: temperature difference threshold

CIDS1, CIDS2: Downflow control signal

CIRSn: Upflow control signal

SS1~SSn: Temperature sensor

R2: output load

Claims (4)

A battery pack temperature equalization system, comprising: a plurality of battery packs connected to each other and stacked on each other, the plurality of battery packs have the same load in a non-uniform temperature mode and respectively output the same multiple initial currents The battery pack stacked in the uppermost layer of the plurality of battery packs has a relatively highest temperature in the non-uniform temperature mode, and the battery pack stacked in the middle layer has an intermediate temperature in the non-uniform temperature mode, and the battery pack is stacked at the highest temperature. The battery pack in the lower layer has a relatively lowest temperature in the non-uniform temperature mode, the battery pack stacked in the uppermost layer outputs a falling current in a temperature equalization mode, and the battery pack stacked in the bottom layer is in the temperature equalization mode. A rising current is output, and the battery pack stacked in the middle layer outputs the initial current in the uniform temperature mode; a plurality of conversion circuits are respectively connected to the plurality of battery packs, among which the battery pack stacked on the uppermost layer is connected The conversion circuit is configured to reduce the load of the battery pack stacked on the uppermost layer according to a received down-current processing signal, so that the battery pack stacked on the uppermost layer is converted to output the falling current instead of the initial current, and The conversion circuit connected to the battery pack stacked in the lowermost layer is configured to upgrade the battery pack stacked in the lowermost layer according to a received up-current processing signal, so that the battery pack stacked in the lowermost layer is converted into The rising current is output instead of the initial current, and the battery pack stacked in the middle layer does not perform the conversion of the initial current through the connected conversion circuit, and does not adjust the load size, wherein the falling current is less than the initial current, the rising The current is greater than the initial current, and the difference between the falling current and the initial current is equal to the difference between the rising current and the initial current; a plurality of temperature sensors are respectively connected to the plurality of battery packs, and each temperature sensor is configured To sense the temperature of the connected battery pack to output a corresponding temperature sensing signal; a plurality of processing circuits are respectively connected to the plurality of conversion circuits and to the plurality of Temperature sensors, each of the processing circuits is configured to receive and transmit the temperature sensing signal from the connected temperature sensor, and output the downflow processing signal according to a received downflow control signal, or according to the received An up-current control signal to output the up-current processing signal; and a main controller, connected to the plurality of processing circuits, configured to control the plurality of battery packs to switch from the non-uniform temperature mode to operating in the uniform temperature mode, the main controller The controller is configured to receive the temperature sensing signal from the plurality of processing circuits to obtain the temperature of the plurality of battery packs; wherein when the main controller compares the temperature difference between the plurality of battery packs greater than a temperature difference threshold The main controller uses the temperature of the battery pack with an intermediate temperature value among the plurality of battery packs as an adjustment reference temperature, compares the temperature of the other battery packs with the adjustment reference temperature, and determines accordingly The current adjustment range of each of the other battery packs is to output the corresponding down-current control signal to the processing circuit connected to the battery pack with the highest temperature among the plurality of battery packs, and to output the corresponding up-current control signal to the The processing circuit connected to the battery pack with the lowest temperature among the plurality of battery packs to enter the uniform temperature mode, the plurality of battery packs connected in parallel have the same temperature with each other, and the temperature of each battery pack is equal to the adjustment reference temperature ; Wherein in the non-uniform temperature mode, the plurality of battery packs respectively output the initial current sum of the total current value is equal to the lower current output of the battery pack stacked on the uppermost layer in the uniform temperature mode , The total current value of the sum of the rising current output by the battery pack stacked in the lowermost layer and the initial current output by the battery pack stacked in the middle layer. The battery pack temperature equalization system described in item 1 of the scope of patent application, wherein a total current summed by the multiple initial currents respectively output by the multiple battery packs in the non-uniform temperature mode has a total current value; In the uniform temperature mode, one or more of the rising currents output by the plurality of battery packs, The total current of one or more of the down currents and one or more of the initial currents has the total current value. A battery pack temperature equalization method is suitable for the battery pack temperature equalization system described in item 1 of the scope of patent application. The battery pack temperature equalization method includes the following steps: stacking and connecting a plurality of battery packs; The battery pack outputs the initial current; each of the temperature sensors is used to sense the temperature of the connected battery pack to output the corresponding temperature sensing signal; each of the processing circuits is used to receive and connect the temperature sensor Transmitting the temperature sensing signal; using the main controller to receive the temperature sensing signal from the processing circuits to obtain the temperature of the battery packs; using the main controller to compare the temperature difference between the battery packs If the value is greater than the temperature difference threshold, if so, the main controller is used to output the down-flow control signal to the processing circuit connected to the battery pack with a relatively high temperature among the plurality of battery packs, and output the up-flow control signal To the processing circuit connected to the relatively low temperature of the plurality of battery packs, if not, maintain each battery pack to output the initial current; use each of the processing circuits to output the down current according to the received down current control signal Process the signal, or output an up-current processing signal according to the received up-current control signal; and use each of the conversion circuits to convert the connected battery pack to output the down current according to the received down-current processing signal, or according to the received The received up-current processing signal is converted and connected to the battery pack to output the up current, so that the multiple battery packs connected in parallel have the same temperature. As described in item 3 of the scope of patent application, the battery pack temperature equalization method, wherein the initial currents output by the plurality of battery packs in the non-uniform temperature mode are a sum of The total current has a total current value; in the uniform temperature mode, one or more of the rising current, one or more of the falling current, and the total of one or more of the initial currents output by the plurality of battery packs The current has this total current value.

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