Balancing resistor temperature rise control method and system

Abstract

The invention discloses an equalization resistor temperature rise control method and system. The method comprises the following steps: sending a power-on instruction to a first battery cluster to conduct a first power-on module of the first battery cluster, and obtaining a voltage difference between the first battery cluster and a second battery cluster; when it is determined that an equalization condition is satisfied according to the voltage difference, controlling an equalization module of the second battery cluster to communicate a battery pack in the second battery cluster with a bus; and obtaining the temperature of the equalization resistor in the second battery cluster through a temperature monitoring module, and when the temperature of the equalization resistor meets a cooling condition, executing cooling operation on the equalization resistor. According to the invention, the temperature monitoring module is arranged to obtain the temperature of the equalization resistor and monitor the temperature of the equalization resistor in real time, and when the temperature of the equalization resistor is too high, the equalization resistor is cooled, so that the problem that the temperature of the equalization resistor is too high to damage itself or surrounding devices in the prior art is solved; the system safety and reliability are effectively improved; and the service life of the equalization resistor is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a method and system for controlling the temperature rise of a balancing resistor. Background Art

[0002] The consistency of battery cells is inevitable. As the number of cycles increases, the consistency deteriorates, and a voltage difference is formed between clusters. When power is applied with a load, an inter-cluster circulating current will be induced, causing potential hazards such as capacity loss, life loss, and increased internal resistance. There is already a method of taking voltage balancing measures to avoid the above hazards by increasing a balancing resistor to reduce the voltage difference.

[0003] However, the existing technology has a problem that when balancing between battery clusters, if the temperature of the balancing resistor is too high, it will cause damage to itself or surrounding devices. Summary of the Invention

[0004] The present invention provides a method and system for controlling the temperature rise of a balancing resistor to solve the problem in the existing technology that the too high temperature of the balancing resistor causes damage to itself or surrounding devices.

[0005] According to an aspect of the present invention, there is provided a method for controlling the temperature rise of a balancing resistor for a system for controlling the temperature rise of a balancing resistor. The system for controlling the temperature rise of a balancing resistor includes at least two battery clusters. The battery cluster includes a battery pack, a temperature monitoring module, a balancing module, and a first power-on module. The battery pack is connected to a bus through the first power-on module or the balancing module; the at least two battery clusters include a first battery cluster and a second battery cluster;

[0006] The method for controlling the temperature rise of the balancing resistor includes:

[0007] Sending a power-on instruction to the first battery cluster to turn on the first power-on module of the first battery cluster, and obtaining the voltage difference between the first battery cluster and the second battery cluster;

[0008] When it is determined that the balancing condition is satisfied according to the voltage difference, controlling the balancing module of the second battery cluster to connect the battery pack in the second battery cluster to the bus. The balancing module includes a balancing resistor;

[0009] Obtaining the temperature of the balancing resistor in the second battery cluster through the temperature monitoring module, and performing a temperature reduction operation on the balancing resistor when the temperature of the balancing resistor satisfies the temperature reduction condition.

[0010] Optionally, the battery cluster further includes a temperature reduction module;

[0011] The obtaining the temperature of the balancing resistor in the second battery cluster through the temperature monitoring module, and performing a temperature reduction operation on the balancing resistor when the temperature of the balancing resistor satisfies the temperature reduction condition includes:

[0012] Obtain the temperature of the equalizing resistor in the second battery cluster through the temperature monitoring module, and when the temperature of the equalizing resistor meets the cooling condition, control to turn on the cooling module of the second battery cluster to cool the equalizing resistor.

[0013] Optionally, the equalizing module includes a first switch and the equalizing resistor, and the first switch and the equalizing resistor are connected in series between the battery pack and the busbar;

[0014] When it is determined that the equalizing condition is met according to the voltage difference, controlling the equalizing module of the second battery cluster to connect the battery pack in the second battery cluster to the busbar includes:

[0015] When it is determined that the equalizing condition is met according to the voltage difference, control the first switch of the second battery cluster to close.

[0016] Optionally, the equalizing condition includes that the voltage difference is greater than or equal to a first preset voltage threshold and less than or equal to a second preset voltage threshold; the method for controlling the temperature rise of the equalizing resistor further includes:

[0017] When the voltage difference is less than the first preset voltage threshold, control the first power-on module of the second battery cluster to conduct;

[0018] When the voltage difference is greater than the second preset voltage threshold, control the first battery cluster to power off and the second battery cluster to not operate.

[0019] Optionally, the cooling condition includes that the temperature of the equalizing resistor is greater than or equal to a first preset temperature threshold and less than or equal to a second preset temperature threshold; the method for controlling the temperature rise of the equalizing resistor further includes:

[0020] When the temperature of the equalizing resistor is greater than the second preset temperature threshold, control the first battery cluster and the second battery cluster to power off until the temperature of the equalizing resistor is less than or equal to a third preset temperature threshold, and then execute the step of sending a power-on instruction to the first battery cluster to make the first power-on module of the first battery cluster conduct, and obtain the voltage difference between the first battery cluster and the second battery cluster, where the third preset temperature threshold is less than the second preset temperature threshold;

[0021] When the temperature of the equalizing resistor is less than the first preset temperature threshold, control the cooling module of the second battery cluster to turn off.

[0022] Optionally, after performing the cooling operation on the equalizing resistor when the temperature of the equalizing resistor meets the cooling condition, it further includes:

[0023] Judge whether the voltage difference is less than the first preset voltage threshold;

[0024] If so, control the balancing module of the second battery cluster to disconnect and the first power-on module to close.

[0025] If not, control the first battery cluster to power off and the second battery cluster to do nothing.

[0026] Optionally, the battery cluster further includes a second power-on module. The bus includes a first bus and a second bus. The positive terminal of the battery pack is connected to the first bus through the first power-on module or the balancing module, and the negative terminal of the battery pack is connected to the second bus through the second power-on module.

[0027] The method for controlling the temperature rise of the balancing resistor further includes:

[0028] Send a power-on instruction to the first battery cluster to turn on the second power-on module of the first battery cluster.

[0029] When it is determined that the balancing condition is satisfied according to the voltage difference, control the second power-on module of the second battery cluster to remain on, and control the balancing module of the second battery cluster to connect the battery pack in the second battery cluster to the second bus.

[0030] Optionally, the first battery cluster and the second battery cluster are arranged adjacent to each other.

[0031] According to another aspect of the present invention, there is provided a system for controlling the temperature rise of a balancing resistor, including at least two battery clusters and a main control module. The battery cluster includes a battery pack, a temperature monitoring module, a balancing module, and a first power-on module. The battery pack is connected to the bus through the first power-on module or the balancing module.

[0032] The main control module is respectively connected to the temperature monitoring module, the balancing module, and the first power-on module.

[0033] The main control module is configured to send a power-on instruction to the first battery cluster to turn on the first power-on module of the first battery cluster, and obtain the voltage difference between the first battery cluster and the second battery cluster.

[0034] The main control module is further configured to, when it is determined that the balancing condition is satisfied according to the voltage difference, control the balancing module of the second battery cluster to connect the battery pack in the second battery cluster to the bus. The balancing module includes a balancing resistor.

[0035] The main control module is further configured to obtain the temperature of the balancing resistor in the second battery cluster through the temperature monitoring module, and perform a temperature reduction operation on the balancing resistor when the temperature of the balancing resistor satisfies the temperature reduction condition.

[0036] Optionally, the main control module includes a first-stage control module and a second-stage control module. The first-stage control module is connected to the second-stage control module, and the second-stage control module is provided in one-to-one correspondence with the battery clusters. The battery clusters further include a temperature reduction module and a second power-on module.

[0037] The second-stage control module is connected to the temperature monitoring module, the equalization module, the first power-on module, the temperature reduction module, and the second power-on module corresponding to the battery cluster.

[0038] The first-stage control module is configured to send a power-on instruction to the first battery cluster through the second-stage control module to turn on the first power-on module and the second power-on module of the first battery cluster, and obtain the voltage difference between the first battery cluster and the second battery cluster through the second-stage control module.

[0039] The first-stage control module is further configured to, when determining that the equalization condition is satisfied according to the voltage difference, control the equalization module and the second power-on module of the second battery cluster to connect the battery packs in the second battery cluster to the bus through the second-stage control module.

[0040] The first-stage control module is further configured to obtain the temperature of the equalization resistor in the second battery cluster through the second-stage control module and the temperature monitoring module, and control the temperature reduction module of the second battery cluster to be turned on through the second-stage control module when the temperature of the equalization resistor satisfies the temperature reduction condition.

[0041] In the technical solution provided by the embodiment of the present invention, when equalizing between the first battery cluster and the second battery cluster through an equalization resistor, a temperature monitoring module is provided to obtain the temperature of the equalization resistor in the second battery cluster and perform real-time monitoring on it. When the equalization resistor satisfies the temperature reduction condition, for example, when the temperature of the equalization resistor is too high, the equalization resistor is cooled down, so that during the equalization process between the battery clusters, through the monitoring of the temperature of the equalization resistor and the cooling operation, it is avoided that the temperature of the equalization resistor is too high, thereby solving the problem that the too high temperature of the equalization resistor in the prior art damages itself or surrounding devices, and effectively improving the system safety, reliability and the life of the equalization resistor.

[0042] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0044] Figure 1 It is a flowchart of a method for controlling the temperature rise of balanced resistors provided by an embodiment of the present invention;

[0045] Figure 2 It is a schematic structural diagram of a system for controlling the temperature rise of balanced resistors provided by an embodiment of the present invention;

[0046] Figure 3 It is a schematic structural diagram of another system for controlling the temperature rise of balanced resistors provided by an embodiment of the present invention;

[0047] Figure 4 It is a flowchart of another method for controlling the temperature rise of balanced resistors provided by an embodiment of the present invention;

[0048] Figure 5 It is a flowchart of yet another method for controlling the temperature rise of balanced resistors provided by an embodiment of the present invention;

[0049] Figure 6 It is a schematic structural diagram of yet another system for controlling the temperature rise of balanced resistors provided by an embodiment of the present invention. Detailed implementation manners

[0050] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, rather than all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0051] It should be noted that the terms "first", "second", etc. in the specification, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0052] Figure 1 FIG. is a flowchart of an equalizing resistor temperature rise control method provided by an embodiment of the present invention. This embodiment is applicable to the situation where the temperature of the equalizing resistor is too high during the battery equalization process. This method is used for the equalizing resistor temperature rise control system. Figure 2 FIG. is a schematic structural diagram of an equalizing resistor temperature rise control system provided by an embodiment of the present invention. Refer to Figure 2 , the equalizing resistor temperature rise control system includes at least two battery clusters. The battery cluster includes a battery pack 10, a temperature monitoring module 20, an equalizing module 30, and a first power-on module 40. The battery pack 10 in each battery cluster is connected to the bus bar L through the first power-on module 40 or the equalizing module 30; the at least two battery clusters include a first battery cluster A1 and a second battery cluster A2, and the first battery cluster A1 and the second battery cluster A2 are arranged adjacent to each other. The equalizing resistor temperature rise control system further includes a main control module 50. The main control module 50 is respectively connected to the temperature monitoring module 20, the equalizing module 30, and the first power-on module 40. The main control module 50 can be used to execute the equalizing resistor temperature rise control method of the embodiment of the present invention.

[0053] Refer to Figure 1 , the equalizing resistor temperature rise control method includes:

[0054] S110. Send a power-on instruction to the first battery cluster to turn on the first power-on module of the first battery cluster, and obtain the voltage difference between the first battery cluster and the second battery cluster.

[0055] Among them, the first power-on module 40 includes a main positive relay.

[0056] Specifically, send a high-voltage power-on instruction to the first battery cluster A1 to close the main positive relay in the first power-on module 40 of the first battery cluster A1. After the main positive relay in the first power-on module 40 of the first battery cluster A1 is closed, obtain the bus voltages of the first battery cluster A1 and the second battery cluster A2 through the battery management system respectively, and calculate the voltage difference between the two. Exemplarily, the main control module 50 can be the battery management system.

[0057] S120. When it is determined that the equalization condition is met based on the voltage difference, control the equalization module of the second battery cluster to connect the battery packs in the second battery cluster to the bus bar. The equalization module includes an equalization resistor.

[0058] Specifically, compare the voltage difference with the voltage range that satisfies the equalization condition to determine whether the voltage difference is within this voltage range. If so, it is determined that the voltage difference meets the equalization condition. When the equalization condition is met, control the second battery cluster A2 to turn on the equalization circuit, that is, control the equalization module 30 of the second battery cluster A2 to conduct, so that the battery packs in the second battery cluster A2 are connected to the bus bar L. In other embodiments, the voltage difference can also be compared with a certain voltage value within the voltage range that satisfies the equalization condition. When the voltage difference is greater than a certain voltage value within this voltage range, it is determined that the voltage difference meets the equalization condition. When the equalization condition is met, control the second battery cluster A2 to turn on the equalization circuit, that is, control the equalization module 30 of the second battery cluster A2 to conduct, so that the battery packs in the second battery cluster A2 are connected to the bus bar L.

[0059] S130. Obtain the temperature of the equalization resistor in the second battery cluster through the temperature monitoring module, and perform a cooling operation on the equalization resistor when the temperature of the equalization resistor meets the cooling condition.

[0060] Optionally, the temperature monitoring module includes a material or component with a (Negative Temperature Coefficient, NTC) negative temperature coefficient characteristic, for example, an NTC thermistor. In other embodiments, the temperature monitoring module can also be other circuits with temperature acquisition functions. The temperature monitoring module is set at a certain distance from the equalization resistor to ensure that the temperature of the equalization resistor can be accurately monitored. Exemplarily, the temperature monitoring module is set in contact with the equalization resistor.

[0061] Specifically, obtain the temperature of the equalization resistor R in the second battery cluster A2 through the temperature monitoring module 20, compare the temperature of the equalization resistor R in the second battery cluster A2 with the temperature range that satisfies the cooling condition, and determine whether the temperature of the equalization resistor R is within this temperature range. If so, it is determined that the temperature of the equalization resistor R meets the cooling condition. When the cooling condition is met, cool the equalization resistor. In other embodiments, the temperature of the equalization resistor can also be compared with a certain temperature value within the temperature range that satisfies the cooling condition. When the temperature of the equalization resistor is greater than a certain temperature value within this temperature range, it is determined that the temperature of the equalization resistor R meets the cooling condition. When the cooling condition is met, cool the equalization resistor.

[0062] In the technical solution provided by the embodiment of the present invention, when balancing between the first battery cluster and the second battery cluster through a balancing resistor, a temperature monitoring module is set to obtain the temperature of the balancing resistor in the second battery cluster and monitor it in real time. When the balancing resistor meets the temperature reduction condition, for example, when the temperature of the balancing resistor is too high, the balancing resistor is cooled down. During the process of balancing between battery clusters, through the monitoring and cooling operation of the temperature of the balancing resistor, the temperature of the balancing resistor will not be too high, thus solving the problem in the prior art that the too high temperature of the balancing resistor damages itself or surrounding devices, and effectively improving the system safety, reliability and the service life of the balancing resistor.

[0063] Figure 3 FIG. 4 is a schematic structural diagram of another balancing resistor temperature rise control system provided by the embodiment of the present invention. The embodiment of the present invention further refines the foregoing embodiment on the basis of the above embodiment. Refer to Figure 3 , optionally, the battery cluster further includes a cooling module 60; S130 specifically includes:

[0064] Obtain the temperature of the balancing resistor in the second battery cluster through the temperature monitoring module. When the temperature of the balancing resistor meets the temperature reduction condition, control to turn on the cooling module of the second battery cluster to cool down the balancing resistor.

[0065] Among them, the cooling module 60 is disposed opposite to the balancing resistor R. The cooling module 60 includes components with a cooling function, for example, a fan.

[0066] Specifically, obtain the temperature of the balancing resistor R in the second battery cluster A2 through the temperature monitoring module 20, compare the temperature of the balancing resistor R in the second battery cluster A2 with the temperature range that meets the temperature reduction condition, and judge whether the temperature of the balancing resistor R in the second battery cluster A2 is within this temperature range. If so, it is determined that the temperature of the balancing resistor R in the second battery cluster A2 meets the temperature reduction condition. In the case of meeting the temperature reduction condition, control to turn on the cooling module 60 in the second battery cluster A2 to cool down the balancing resistor R. In other embodiments, it is also possible to obtain the temperature of the balancing resistor R in the second battery cluster A2 through the temperature monitoring module 20, compare the temperature of the balancing resistor R in the second battery cluster A2 with a certain temperature value within the temperature range that meets the temperature reduction condition. When the temperature of the balancing resistor in the second battery cluster A2 is greater than a certain temperature value within this temperature range, it is determined that the temperature of the balancing resistor R in the second battery cluster A2 meets the temperature reduction condition. In the case of meeting the temperature reduction condition, control to turn on the cooling module 60 in the second battery cluster A2 to cool down the balancing resistor R.

[0067] In some optional embodiments, after obtaining the temperature of the balancing resistor in the second battery cluster through the temperature monitoring module, it further includes: when the temperature of the balancing resistor does not meet the temperature reduction condition, controlling the first battery cluster and the second battery cluster to perform intermittent balancing.

[0068] Specifically, the temperature of the balancing resistor R in the second battery cluster A2 is obtained through the temperature monitoring module 20. The temperature of the balancing resistor R in the second battery cluster A2 is compared with the temperature range that meets the cooling condition to determine whether the temperature of the balancing resistor R in the second battery cluster A2 is within this temperature range. If not, it is determined that the temperature of the balancing resistor R in the second battery cluster A2 does not meet the cooling condition. In the case where the cooling condition is not met, the power-down between the first battery cluster and the second battery cluster is controlled, and the temperature of the balancing resistor is allowed to stand until it reaches room temperature. After the temperature of the balancing resistor stands until it reaches room temperature, step S110 is executed. In other embodiments, the temperature of the balancing resistor R in the second battery cluster A2 can also be obtained through the temperature monitoring module 20. The temperature of the balancing resistor R in the second battery cluster A2 is compared with a certain temperature value within the temperature range that meets the cooling condition. When the temperature of the balancing resistor in the second battery cluster A2 is less than a certain temperature value within this temperature range, it is determined that the temperature of the balancing resistor R in the second battery cluster A2 does not meet the cooling condition. In the case where the cooling condition is not met, the power-down between the first battery cluster and the second battery cluster is controlled, and the temperature of the balancing resistor is allowed to stand until it reaches room temperature. After the temperature of the balancing resistor stands until it reaches room temperature, step S110 is executed.

[0069] The technical solution provided by the embodiment of the present invention obtains the temperature of the balancing resistor in the second battery cluster through the temperature monitoring module. When the temperature of the balancing resistor meets the cooling condition, the cooling module is controlled to be turned on, and the balancing resistor is cooled; when the temperature of the balancing resistor does not meet the cooling condition, the intermittent balancing of the first battery cluster and the second battery cluster is controlled, that is, the power-down between the first battery cluster and the second battery cluster is controlled, and the temperature of the balancing resistor is allowed to stand until it reaches room temperature. After the temperature of the balancing resistor stands until it reaches room temperature, the step of sending a power-on command to the first battery cluster to make the first power-on module of the first battery cluster conduct and obtaining the voltage difference between the first battery cluster and the second battery cluster is re-executed, thereby effectively controlling the temperature rise of the balancing resistor and further effectively improving the system safety, reliability and the life of the balancing resistor.

[0070] Continue to refer to Figure 3 , optionally, the balancing module 30 includes a first switch S1 and a balancing resistor R. The first switch S1 and the balancing resistor R are connected in series between the battery pack and the bus bar L1; S120 specifically includes:

[0071] When it is determined that the balancing condition is met according to the voltage difference, the first switch of the second battery cluster is controlled to close.

[0072] Specifically, the voltage difference is compared with the voltage range that satisfies the equalization condition to determine whether the voltage difference is within this voltage range. If so, it is determined that the voltage difference satisfies the equalization condition. When the equalization condition is satisfied, the equalization circuit of the second battery cluster A2 is controlled to be turned on, that is, the first switch S1 in the equalization module 30 of the second battery cluster A2 is controlled to close, so that the battery packs in the second battery cluster A2 are connected to the bus bar L1. In other embodiments, the voltage difference can also be compared with a certain voltage value within the voltage range that satisfies the equalization condition. When the voltage difference is greater than a certain voltage value within this voltage range, it is determined that the voltage difference satisfies the equalization condition. When the equalization condition is satisfied, the equalization circuit of the second battery cluster A2 is controlled to be turned on, that is, the first switch S1 in the equalization module 30 of the second battery cluster A2 is controlled to close, so that the battery packs in the second battery cluster A2 are connected to the bus bar L1.

[0073] Figure 4 FIG. is a flowchart of another method for controlling the temperature rise of the equalization resistor provided by the embodiment of the present invention. The embodiment of the present invention further refines the foregoing embodiments on the basis of the above embodiments. Refer to Figure 4 Optionally, the equalization condition includes that the voltage difference is greater than or equal to a first preset voltage threshold and less than or equal to a second preset voltage threshold; the first preset voltage threshold is less than the second preset voltage threshold.

[0074] Wherein, the first preset voltage threshold and the second preset voltage threshold can be preset according to the characteristics of the internal components of the battery cluster. The first preset voltage threshold is the voltage that the internal components of the battery cluster may withstand under normal operation, and the second preset voltage threshold is the maximum tolerable voltage that may cause damage to the internal components of the battery cluster.

[0075] The method for controlling the temperature rise of the equalization resistor includes:

[0076] S210. Send a power-on command to the first battery cluster to turn on the first power-on module of the first battery cluster, and obtain the voltage difference between the first battery cluster and the second battery cluster.

[0077] S220. Determine whether the voltage difference satisfies the equalization condition. If so, execute S230; otherwise, execute S240 or S250.

[0078] S230. Control the equalization module of the second battery cluster to connect the battery packs in the second battery cluster to the bus bar. The equalization module includes an equalization resistor.

[0079] S240. When the voltage difference is less than the first preset voltage threshold, control the first power-on module of the second battery cluster to turn on.

[0080] Specifically, when the voltage difference is less than the first preset voltage threshold, it indicates that the voltage difference does not meet the equalization condition, so no equalization is performed. Instead, the second battery cluster is directly energized with high voltage according to the normal power consumption circuit, that is, the first power-on module of the second battery cluster is controlled to conduct, which means controlling the main positive relay of the second battery cluster to close.

[0081] S250. When the voltage difference is greater than the second preset voltage threshold, control the first battery cluster to de-energize and the second battery cluster to remain inactive.

[0082] Specifically, when the voltage difference is greater than the second preset voltage threshold, it indicates that the current voltage difference may cause damage to the internal components of the battery cluster, which is not allowed by the system. At this time, the system will display "equalization failure", and at the same time control the first battery cluster to de-energize and the second battery cluster to remain inactive.

[0083] Optionally, the cooling condition includes that the temperature of the equalization resistor is greater than or equal to the first preset temperature threshold and less than or equal to the second preset temperature threshold; the first preset temperature threshold is less than the second preset temperature threshold.

[0084] Among them, the first preset temperature threshold and the second preset temperature threshold can be preset according to the characteristics of the internal components of the battery cluster. The first preset temperature threshold is the temperature that the internal components of the battery cluster can withstand under normal operation. For example, the first preset temperature threshold is set to 100 °C; the second preset temperature threshold is the maximum tolerable temperature that may cause damage to the internal components of the battery cluster. For example, the first preset temperature threshold is set to 170 °C.

[0085] S260. Determine whether the temperature of the equalization resistor meets the cooling condition. If so, execute S270; otherwise, execute S280 or S290.

[0086] S270. Obtain the temperature of the equalization resistor in the second battery cluster through the temperature monitoring module, and perform the cooling operation on the equalization resistor when the temperature of the equalization resistor meets the cooling condition.

[0087] S280. When the temperature of the equalization resistor is greater than the second preset temperature threshold, control the first battery cluster and the second battery cluster to de-energize until the temperature of the equalization resistor is less than or equal to the third preset temperature threshold, and then execute step S210. The third preset temperature threshold is less than the second preset temperature threshold.

[0088] Exemplarily, when the temperature of the balancing resistor is greater than 170°C, the first battery cluster and the second battery cluster are controlled to power off. That is, the main positive relay in the first power-on module of the first battery cluster is controlled to disconnect, and the first switch in the balancing module of the second battery cluster is controlled to disconnect. After the temperature of the balancing resistor is allowed to stand until it is less than or equal to the third preset temperature threshold, a power-on command is sent to the first battery cluster again to turn on the first power-on module of the first battery cluster, and the voltage difference between the first battery cluster and the second battery cluster is obtained. Among them, the third preset temperature threshold is preset according to the room temperature.

[0089] S290. When the temperature of the balancing resistor is less than the first preset temperature threshold, the cooling module of the second battery cluster is controlled to turn off.

[0090] Exemplarily, when the temperature of the balancing resistor is less than 100°C, there is no need to cool the balancing resistor, that is, the cooling module of the second battery cluster is controlled to turn off.

[0091] The technical solution provided by the embodiments of the present invention compares the voltage difference with the first preset voltage threshold and the second preset voltage threshold. When the voltage difference satisfies the balancing condition, that is, the voltage difference is greater than or equal to the first preset voltage threshold and less than or equal to the second preset voltage threshold, the balancing module of the second battery cluster is controlled to connect the battery pack in the second battery cluster to the busbar; when the voltage difference is less than the first preset voltage threshold, the first power-on module of the second battery cluster is controlled to turn on; when the voltage difference is greater than the second preset voltage threshold, the first battery cluster is controlled to power off and the second battery cluster does not operate. By comparing the temperature of the balancing resistor with the first preset temperature threshold and the second preset temperature threshold, when the temperature of the balancing resistor satisfies the cooling condition, that is, the temperature of the balancing resistor is greater than or equal to the first preset temperature threshold and less than or equal to the second preset temperature threshold, a cooling operation on the balancing resistor is performed; when the temperature of the balancing resistor is greater than the second preset temperature threshold, the first battery cluster and the second battery cluster are controlled for intermittent balancing, that is, the first battery cluster and the second battery cluster are controlled to power off, and the temperature of the balancing resistor is allowed to stand until it reaches room temperature. After the temperature of the balancing resistor is allowed to stand until it reaches room temperature, the step of sending a power-on command to the first battery cluster again to turn on the first power-on module of the first battery cluster and obtaining the voltage difference between the first battery cluster and the second battery cluster is performed again; when the temperature of the balancing resistor is less than the first preset temperature threshold, the cooling module of the second battery cluster is controlled to turn off. According to the different control strategies corresponding to the above different temperatures, the effective control of the temperature rise of the balancing resistor is realized, and further the system safety, reliability and the life of the balancing resistor are effectively improved.

[0092] Figure 5 This is a flowchart of another method for controlling the temperature rise of the balancing resistor provided by the embodiments of the present invention. The embodiments of the present invention further refine the foregoing embodiments on the basis of the above embodiments. Refer to Figure 5, optionally, after S270, it further includes:

[0093] S310. Determine whether the voltage difference is less than the first preset voltage threshold.

[0094] If yes, execute S320; if no, execute S250.

[0095] S320. Control the disconnection of the balancing module of the second battery cluster and the closing of the first power-on module.

[0096] Specifically, determine whether the voltage difference is less than the first preset voltage threshold; if yes, no balancing is required, the balancing module of the second battery cluster needs to be disconnected, and high-voltage power is applied to the second battery cluster according to the normal power consumption circuit, that is, after disconnecting the balancing module of the second battery cluster, control the closing of the first power-on module of the second battery cluster, that is, control the closing of the main positive relay of the second battery cluster.

[0097] Continue to refer to Figure 3 , optionally, the battery cluster further includes a second power-on module 70, the bus includes a first bus L1 and a second bus L2, the positive terminal of the battery pack is connected to the first bus L1 through the first power-on module 40 or the balancing module 30, and the negative terminal of the battery pack is connected to the second bus L2 through the second power-on module 70.

[0098] The method for controlling the temperature rise of the balancing resistor further includes:

[0099] Send a power-on instruction to the first battery cluster to make the second power-on module of the first battery cluster conduct;

[0100] Among them, the second power-on module includes a main negative relay.

[0101] When it is determined that the balancing condition is met according to the voltage difference, control the second power-on module of the second battery cluster to remain conducting, and control the balancing module of the second battery cluster to connect the battery packs in the second battery cluster to the second bus.

[0102] It should be noted that when the first battery cluster is powered on, both the main positive relay of the first power-on module and the main negative relay of the second power-on module of the first battery cluster are closed, and when the second battery cluster is powered on, both the first switch in the balancing module of the second battery cluster and the main negative relay of the second power-on module are closed.

[0103] Continue to refer to Figure 2 , the system includes at least two battery clusters and a main control module 50, the battery cluster includes a battery pack 10, a temperature monitoring module 20, a balancing module 30 and a first power-on module 40, the battery pack 10 is connected to the bus through the first power-on module 40 or the balancing module 30, and the main control module 50 is respectively connected to the temperature monitoring module 20, the balancing module 30 and the first power-on module 40.

[0104] The main control module 50 is used to send a power-on instruction to the first battery cluster A1 to turn on the first power-on module 40 of the first battery cluster A1, and obtain the voltage difference between the first battery cluster A1 and the second battery cluster A2.

[0105] The main control module 50 is further used to control the balancing module 30 of the second battery cluster A2 to connect the battery packs in the second battery cluster A2 to the bus when the balancing condition is met according to the voltage difference. The balancing module includes a balancing resistor R.

[0106] The main control module 50 is further used to obtain the temperature of the balancing resistor R in the second battery cluster A2 through the temperature monitoring module 20, and perform a cooling operation on the balancing resistor R when the temperature of the balancing resistor R meets the cooling condition.

[0107] The balancing resistor temperature rise control system provided by the embodiment of the present invention can execute the balancing resistor temperature rise control method provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing the method.

[0108] Figure 6 It is a structural schematic diagram of another balancing resistor temperature rise control system provided by the embodiment of the present invention. The embodiment of the present invention further refines the foregoing embodiment on the basis of the above embodiment. Refer to Figure 6 The main control module 50 includes a first-stage control module 51 and a second-stage control module 52. The first-stage control module 51 is connected to the second-stage control module 52, and the second-stage control module 52 is provided corresponding to each battery cluster; the battery cluster further includes a cooling module 60 and a second power-on module 70; the second-stage control module 52 is connected to the temperature monitoring module 20, the balancing module 30, the first power-on module 40, the cooling module 60 and the second power-on module 70 of the corresponding battery cluster.

[0109] The first-stage control module 51 is used to send a power-on instruction to the first battery cluster through the second-stage control module 52 to turn on the first power-on module 40 and the second power-on module 70 of the first battery cluster, and obtain the voltage difference between the first battery cluster A1 and the second battery cluster A2 through the second-stage control module 52.

[0110] The first-stage control module 51 is further used to control the balancing module 30 and the second power-on module 70 of the second battery cluster A2 to connect the battery packs in the second battery cluster A2 to the bus through the second-stage control module 52 when the balancing condition is met according to the voltage difference;

[0111] The first-stage control module 51 is further used to obtain the temperature of the balancing resistor R in the second battery cluster A2 through the second-stage control module 52 and the temperature monitoring module 20, and control to turn on the cooling module 60 of the second battery cluster A2 through the second-stage control module 52 when the temperature of the balancing resistor R meets the cooling condition.

[0112] It should be understood that the various forms of processes shown above can be used, with steps reordered, added or deleted. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is imposed herein.

[0113] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for controlling temperature rise of a balanced resistor, characterized in that: Used for a balancing resistor temperature rise control system, the balancing resistor temperature rise control system comprises at least two battery clusters, the battery cluster comprises a battery pack, a temperature monitoring module, a balancing module and a first power-on module, the battery pack is connected to a bus bar through the first power-on module or the balancing module; the at least two battery clusters comprise a first battery cluster and a second battery cluster; The equalizing resistor temperature rise control method comprises: sending a power-on instruction to the first battery cluster to turn on a first power-on module of the first battery cluster, and obtaining a voltage difference between the first battery cluster and the second battery cluster; When it is determined according to the voltage difference that a balancing condition is met, controlling the balancing module of the second battery cluster to connect the battery group in the second battery cluster to the bus bar, the balancing module comprising a balancing resistor; The temperature of the balancing resistor in the second battery cluster is acquired through the temperature monitoring module, and when the temperature of the balancing resistor meets a temperature reduction condition, a temperature reduction operation is performed on the balancing resistor.

2. The method for controlling the temperature rise of a balancing resistor according to claim 1, characterized in that: The battery cluster also includes a cooling module; The step of acquiring the temperature of the balancing resistor in the second battery cluster by the temperature monitoring module and performing a cooling operation on the balancing resistor when the temperature of the balancing resistor meets a cooling condition includes: The temperature of the balancing resistor in the second battery cluster is obtained through the temperature monitoring module. When the temperature of the balancing resistor meets the cooling condition, the cooling module of the second battery cluster is controlled to start to cool the balancing resistor.

3. The method for controlling the temperature rise of a balancing resistor according to claim 1, characterized in that: The balancing module includes a first switch and the balancing resistor, wherein the first switch and the balancing resistor are connected in series between the battery pack and the bus bar; When it is determined according to the voltage difference that the balancing condition is satisfied, controlling the balancing module of the second battery cluster to connect the battery group in the second battery cluster to the bus bar comprises: When it is determined according to the voltage difference that a balancing condition is met, the first switch of the second battery cluster is controlled to be closed.

4. The method for controlling the temperature rise of a balancing resistor according to claim 1, characterized in that: The equilibrium condition includes that the voltage difference is greater than or equal to a first preset voltage threshold and less than or equal to a second preset voltage threshold; The equalizing resistor temperature rise control method further includes: When the voltage difference is less than the first preset voltage threshold, controlling the first power-on module of the second battery cluster to be turned on; When the voltage difference is greater than the second preset voltage threshold, the first battery cluster is controlled to be powered off and the second battery cluster is controlled to be inactive.

5. The method for controlling the temperature rise of a balancing resistor according to claim 1, characterized in that: The temperature drop condition includes that the temperature of the balancing resistor is greater than or equal to a first preset temperature threshold and less than or equal to a second preset temperature threshold; The equalizing resistor temperature rise control method further includes: When the temperature of the balancing resistor is greater than the second preset temperature threshold, controlling the first battery cluster and the second battery cluster to be powered off, until the temperature of the balancing resistor is less than or equal to a third preset temperature threshold, executing the step of sending a power-on instruction to the first battery cluster to turn on the first power-on module of the first battery cluster, and obtaining the voltage difference between the first battery cluster and the second battery cluster, wherein the third preset temperature threshold is less than the second preset temperature threshold; When the temperature of the balancing resistor is lower than the first preset temperature threshold, the cooling module of the second battery cluster is controlled to be turned off.

6. The method for controlling the temperature rise of a balancing resistor according to claim 1, characterized in that: When the temperature of the balancing resistor meets the temperature reduction condition, after performing the temperature reduction operation on the balancing resistor, the method further includes: Determining whether the voltage difference is less than a first preset voltage threshold; If yes, control the balancing module of the second battery cluster to be disconnected and the first power-on module to be closed; If not, the first battery cluster is controlled to be powered off and the second battery cluster is controlled to be inactive.

7. The method for controlling the temperature rise of a balancing resistor according to claim 1, characterized in that: The battery cluster further includes a second power-on module, the busbar includes a first busbar and a second busbar, the positive terminal of the battery pack is connected to the first busbar through the first power-on module or the balancing module, and the negative terminal of the battery pack is connected to the second busbar through the second power-on module; The equalizing resistor temperature rise control method further includes: sending a power-on instruction to the first battery cluster to turn on the second power-on module of the first battery cluster; When it is determined according to the voltage difference that the balancing condition is met, the second power-on module of the second battery cluster is controlled to remain turned on, and the balancing module of the second battery cluster is controlled to connect the battery groups in the second battery cluster to the second bus bar.

8. The method for controlling the temperature rise of a balancing resistor according to claim 1, characterized in that: The first battery cluster and the second battery cluster are disposed adjacent to each other.

9. A balanced resistance temperature rise control system, characterized in that: The invention comprises at least two battery clusters and a main control module, wherein the battery cluster comprises a battery group, a temperature monitoring module, a balancing module and a first power-on module, and the battery group is connected to a bus bar through the first power-on module or the balancing module; The main control module is connected to the temperature monitoring module, the balancing module and the first power-on module respectively; The main control module is used to send a power-on instruction to the first battery cluster to turn on the first power-on module of the first battery cluster and obtain a voltage difference between the first battery cluster and the second battery cluster; The main control module is further configured to control the balancing module of the second battery cluster to connect the battery group in the second battery cluster to the bus bar when it is determined according to the voltage difference that a balancing condition is met, wherein the balancing module includes a balancing resistor; The main control module is further configured to obtain the temperature of the balancing resistor in the second battery cluster through the temperature monitoring module, and execute a cooling operation on the balancing resistor when the temperature of the balancing resistor meets a cooling condition.

10. The balanced resistance temperature rise control system according to claim 9, characterized in that: The main control module includes a first-level control module and a second-level control module, the first-level control module is connected to the second-level control module, and the second-level control module is arranged in a one-to-one correspondence with the battery cluster; the battery cluster also includes a cooling module and a second power-on module; The second-level control module is connected to the temperature monitoring module, the balancing module, the first power-on module, the cooling module and the second power-on module corresponding to the battery cluster; The first-level control module is used to send a power-on instruction to the first battery cluster through the second-level control module to turn on the first power-on module and the second power-on module of the first battery cluster, and obtain the voltage difference between the first battery cluster and the second battery cluster through the second-level control module; The first-level control module is further configured to control the balancing module and the second power-on module of the second battery cluster to connect the battery group in the second battery cluster to the bus bar through the second-level control module when determining that the balancing condition is met according to the voltage difference; The first-level control module is also used to obtain the temperature of the balancing resistor in the second battery cluster through the second-level control module and the temperature monitoring module, and when the temperature of the balancing resistor meets the cooling condition, control the cooling module of the second battery cluster to be turned on through the second-level control module.

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