Method and system for controlling temperature rise of balancing resistor

Abstract

A method and system for controlling a temperature rise of a balancing resistor. The method comprises: sending a power-on instruction to a first battery cluster, so as to turn on a first power-on module of the first battery cluster, and acquiring a voltage difference between the first battery cluster and a second battery cluster (S110); when it is determined on the basis of the voltage difference that a balancing condition is met, controlling a balancing module of the second battery cluster to connect a battery pack in the second battery cluster to a busbar (S120); and acquiring the temperature of a balancing resistor in the second battery cluster by means of a temperature monitoring module, and when the temperature of the balancing resistor meets a cooling condition, executing a cooling operation on the balancing resistor (S130).

Description

Equalizing Resistance Temperature Rise Control Method and System

[0001] This application claims priority to Chinese Patent Application No. 202510368668.X, filed with the Chinese Patent Office on March 26, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and for example to a method and system for equalizing resistance temperature rise control. Background Technology

[0003] Cell consistency is unavoidable. As the cells are used repeatedly, the consistency deteriorates, and a voltage difference is formed between the cells. When a load is applied at this time, it will cause circulating current between the cells, resulting in potential problems such as capacity loss, life loss, and increased internal resistance. Related technologies take voltage balancing measures by adding equalization resistors to reduce voltage differences and avoid potential problems. However, when equalizing between battery cells, the temperature of the equalization resistor is too high, which can damage itself or surrounding devices. Summary of the Invention

[0004] This application provides a method and system for controlling the temperature rise of the equalizing resistor, so as to avoid damage to itself or surrounding devices caused by excessively high temperature of the equalizing resistor.

[0005] According to one aspect of this application, a method for controlling the temperature rise of equalizing resistance is provided for use in an equalizing resistance temperature rise control system. The equalizing resistance temperature rise control system includes at least two battery clusters. Each battery cluster includes a battery pack, a temperature monitoring module, an equalizing module, and a first power-on module. The battery pack is connected to a busbar through the first power-on module or the equalizing module. The at least two battery clusters include a first battery cluster and a second battery cluster.

[0006] Methods for controlling temperature rise by equalizing resistance include:

[0007] 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;

[0008] When the equalization condition is met based on the voltage difference, the equalization module of the second battery cluster connects the battery pack in the second battery cluster to the bus. The equalization module includes an equalization resistor.

[0009] The temperature of the equalization resistor in the second battery cluster is obtained through the temperature monitoring module. When the temperature of the equalization resistor meets the cooling conditions, the cooling operation of the equalization resistor is performed.

[0010] According to another aspect of this application, a balanced resistance temperature rise control system is provided, including at least two battery clusters and a main control module. The battery clusters include a battery pack, a temperature monitoring module, a balanced module, and a first power-on module. The battery packs are connected to the bus via the first power-on module or the balanced module.

[0011] The main control module is connected to the temperature monitoring module, the equalization module, and the first power-on module, respectively.

[0012] The main control module is configured to send a power-on command to the first battery cluster to turn on the first power-on module of the first battery cluster, and to obtain the voltage difference between the first battery cluster and the second battery cluster.

[0013] The main control module is also configured to control the equalization module of the second battery cluster to connect the battery pack in the second battery cluster to the bus when the equalization condition is met based on the voltage difference. The equalization module includes an equalization resistor.

[0014] The main control module is also configured to obtain the temperature of the equalization resistor in the second battery cluster through the temperature monitoring module, and to perform a cooling operation on the equalization resistor when the temperature of the equalization resistor meets the cooling conditions.

[0015] The technical solution provided in this application, by setting up a temperature monitoring module to obtain the temperature of the equalizing resistor in the second battery cluster during the equalization of the first and second battery clusters through the equalizing resistor, and monitoring it in real time, and when the equalizing resistor meets the cooling conditions, such as when the temperature of the equalizing resistor is too high, the equalizing resistor is cooled down. In the process of equalization between battery clusters, by monitoring the temperature of the equalizing resistor and cooling it down, the temperature of the equalizing resistor is prevented from becoming too high, thereby avoiding damage to itself or surrounding devices caused by the excessive temperature of the equalizing resistor in related technologies, and effectively improving the system safety, reliability and lifespan of the equalizing resistor. Attached Figure Description

[0016] Figure 1 is a flowchart of a method for controlling the temperature rise of equalized resistance provided by some implementations of this application;

[0017] Figure 2 is a schematic diagram of a balanced resistance temperature rise control system provided by some implementation methods of this application;

[0018] Figure 3 is a schematic diagram of another equal resistance temperature rise control system provided by some implementation methods of this application;

[0019] Figure 4 is a flowchart of another equal resistance temperature rise control method provided by some implementation methods of this application;

[0020] Figure 5 is a flowchart of another equal resistance temperature rise control method provided by some implementation methods of this application;

[0021] Figure 6 is a schematic diagram of another equal resistance temperature rise control system provided by some implementation methods of this application. Detailed Implementation

[0022] Figure 1 is a flowchart of a method for controlling the temperature rise of an equalizing resistor according to an embodiment of this application. This embodiment is applicable to situations where the temperature of the equalizing resistor is too high during battery equalization. This method is used in an equalizing resistor temperature rise control system. Figure 2 is a schematic diagram of the structure of an equalizing resistor temperature rise control system according to an embodiment of this application. Referring to Figure 2, the equalizing resistor temperature rise control system includes at least two battery clusters. Each 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 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, which are arranged adjacent to each other. The equalizing resistor temperature rise control system also includes a main control module 50, which is 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 configured to execute the equalizing resistor temperature rise control method of this application embodiment.

[0023] Referring to Figure 1, this equalization resistor temperature rise control method includes:

[0024] S110. 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.

[0025] The first power-on module 40 includes a main positive relay.

[0026] For example, a high-voltage power-on command is sent 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, the bus voltages of the first battery cluster A1 and the second battery cluster A2 are obtained by the battery management system, and the voltage difference between them is calculated. For example, the main control module 50 can be the battery management system.

[0027] S120. When the equalization condition is met based on the voltage difference, the equalization module of the second battery cluster connects the battery pack in the second battery cluster to the bus. The equalization module includes an equalization resistor.

[0028] For example, the voltage difference is compared with a voltage range that satisfies the balancing condition to determine if the voltage difference falls within that range. If the voltage difference is within the range, it is determined that the voltage difference satisfies the balancing condition. If the balancing condition is met, the second battery cluster A2 is controlled to activate its balancing circuit; that is, the balancing module 30 of the second battery cluster A2 is controlled to conduct, so that the battery pack in the second battery cluster A2 is connected to the bus L. In other embodiments, the voltage difference can also be compared with a voltage value within the voltage range that satisfies the balancing condition. If the voltage difference is greater than a voltage value within that range, it is determined that the voltage difference satisfies the balancing condition. If the balancing condition is met, the second battery cluster A2 is controlled to activate its balancing circuit; that is, the balancing module 30 of the second battery cluster A2 is controlled to conduct, so that the battery pack in the second battery cluster A2 is connected to the bus L.

[0029] S130. The temperature of the equalization resistor in the second battery cluster is obtained through the temperature monitoring module. When the temperature of the equalization resistor meets the cooling conditions, the cooling operation of the equalization resistor is performed.

[0030] Optionally, the temperature monitoring module includes materials or components with a negative temperature coefficient (NTC), such as an NTC thermistor. In other embodiments, the temperature monitoring module may also be other circuits with temperature acquisition capabilities. The temperature monitoring module is positioned within a certain distance of the balancing resistor to ensure accurate monitoring of the resistor's temperature; exemplaryly, the temperature monitoring module is positioned in contact with the balancing resistor.

[0031] For example, the temperature of the equalizing resistor R in the second battery cluster A2 is obtained by the temperature monitoring module 20. The temperature of the equalizing resistor R in the second battery cluster A2 is compared with a temperature range that meets the cooling conditions to determine whether the temperature of the equalizing resistor R is within the temperature range. If the temperature of the equalizing resistor R is within the temperature range, it is determined that the temperature of the equalizing resistor R meets the cooling conditions, and the equalizing resistor is cooled down if the cooling conditions are met. In other embodiments, the temperature of the equalizing resistor can also be compared with a certain temperature value within the temperature range that meets the cooling conditions. When the temperature of the equalizing resistor is greater than a certain temperature value within the temperature range, it is determined that the temperature of the equalizing resistor R meets the cooling conditions, and the equalizing resistor is cooled down if the cooling conditions are met.

[0032] The technical solution provided in this application embodiment, by setting a temperature monitoring module to obtain the temperature of the equalizing resistor in the second battery cluster when the first battery cluster and the second battery cluster are equalized through an equalizing resistor, and monitoring it in real time, when the equalizing resistor meets the cooling conditions, such as when the temperature of the equalizing resistor is too high, the equalizing resistor is cooled down. In the process of equalizing between battery clusters, by monitoring the temperature of the equalizing resistor and cooling down, the temperature of the equalizing resistor is prevented from becoming too high, thereby avoiding damage to itself or surrounding devices caused by the excessive temperature of the equalizing resistor in related technologies, and effectively improving the system safety, reliability and lifespan of the equalizing resistor.

[0033] Figure 3 is a schematic diagram of another equalizing resistance temperature rise control system provided in an embodiment of this application. Referring to Figure 3, optionally, the battery cluster also includes a cooling module 60; S130 includes:

[0034] The temperature of the equalizing resistor in the second battery cluster is obtained through the temperature monitoring module. When the temperature of the equalizing resistor meets the cooling conditions, the cooling module of the second battery cluster is activated to cool the equalizing resistor.

[0035] The cooling module 60 is positioned opposite to the equalizing resistor R, and the cooling module 60 includes components with cooling functions, such as a fan.

[0036] For example, the temperature of the equalizing resistor R in the second battery cluster A2 is obtained through the temperature monitoring module 20. The temperature of the equalizing resistor R in the second battery cluster A2 is compared with a temperature range that meets the cooling conditions. It is determined whether the temperature of the equalizing resistor R in the second battery cluster A2 falls within this temperature range. If the temperature of the equalizing resistor R is within this temperature range, it is determined that the temperature of the equalizing resistor R in the second battery cluster A2 meets the cooling conditions. If the cooling conditions are met, the cooling module 60 in the second battery cluster A2 is activated to cool the equalizing resistor R. In other embodiments, the temperature of the equalizing resistor R in the second battery cluster A2 can also be obtained through the temperature monitoring module 20. The temperature of the equalizing resistor R in the second battery cluster A2 is compared with a certain temperature value within the temperature range that meets the cooling conditions. If the temperature of the equalizing resistor R 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 equalizing resistor R in the second battery cluster A2 meets the cooling conditions. If the cooling conditions are met, the cooling module 60 in the second battery cluster A2 is activated to cool the equalizing resistor R.

[0037] In some optional embodiments, after obtaining the temperature of the equalization resistor in the second battery cluster through the temperature monitoring module, the method further includes: when the temperature of the equalization resistor does not meet the cooling conditions, controlling the first battery cluster and the second battery cluster to intermittently equalize.

[0038] For example, the temperature of the equalizing resistor R in the second battery cluster A2 is obtained by the temperature monitoring module 20. The temperature of the equalizing resistor R in the second battery cluster A2 is compared with the temperature range that meets the cooling conditions. It is determined whether the temperature of the equalizing resistor R in the second battery cluster A2 is within the temperature range. If the temperature of the equalizing resistor R is not within the temperature range, it is determined that the temperature of the equalizing resistor R in the second battery cluster A2 does not meet the cooling conditions. In the case that the cooling conditions are not met, the first battery cluster and the second battery cluster are powered off, and the temperature of the equalizing resistor is allowed to settle to room temperature. After the temperature of the equalizing resistor is allowed to settle to room temperature, step S110 is executed. In other embodiments, the temperature of the equalizing resistor R in the second battery cluster A2 can also be obtained by the temperature monitoring module 20. The temperature of the equalizing resistor R in the second battery cluster A2 is compared with a certain temperature value within the temperature range that meets the cooling conditions. When the temperature of the equalizing resistor in the second battery cluster A2 is less than a certain temperature value within the temperature range, it is determined that the temperature of the equalizing resistor R in the second battery cluster A2 does not meet the cooling conditions. In the case that the cooling conditions are not met, the first battery cluster and the second battery cluster are powered off, and the temperature of the equalizing resistor is allowed to settle to room temperature. After the temperature of the equalizing resistor is allowed to settle to room temperature, step S110 is executed.

[0039] The technical solution provided in this application embodiment obtains the temperature of the equalizing resistor in the second battery cluster through a temperature monitoring module. When the temperature of the equalizing resistor meets the cooling conditions, the cooling module is activated to cool the equalizing resistor. When the temperature of the equalizing resistor does not meet the cooling conditions, the first and second battery clusters are intermittently equalized. That is, the first and second battery clusters are powered off, and the temperature of the equalizing resistor is allowed to settle to room temperature. After the temperature of the equalizing resistor has settled to room temperature, the step of sending a power-on command to the first battery cluster is re-executed to turn on the first power-on module of the first battery cluster and to obtain the voltage difference between the first and second battery clusters is executed. This achieves effective control of the temperature rise of the equalizing resistor, effectively improving the system safety, reliability, and lifespan of the equalizing resistor.

[0040] Referring again to Figure 3, optionally, the equalization module 30 includes a first switch S1 and an equalization resistor R, which are connected in series between the battery pack and the bus L1; S120 includes:

[0041] When the voltage difference determines that the equilibrium condition is met, the first switch of the second battery cluster is closed.

[0042] For example, the voltage difference is compared with a voltage range that satisfies the balancing condition to determine if the voltage difference falls within that range. If the voltage difference falls within that range, it is determined that the voltage difference satisfies the balancing condition. If the balancing condition is met, the second battery cluster A2 is controlled to open its balancing circuit; that is, the first switch S1 in the balancing module 30 of the second battery cluster A2 is closed to connect the battery pack in the second battery cluster A2 to the bus L1. In other embodiments, the voltage difference can also be compared with a voltage value within the voltage range that satisfies the balancing condition. If the voltage difference is greater than a voltage value within that range, it is determined that the voltage difference satisfies the balancing condition. If the balancing condition is met, the second battery cluster A2 is controlled to open its balancing circuit; that is, the first switch S1 in the balancing module 30 of the second battery cluster A2 is closed to connect the battery pack in the second battery cluster A2 to the bus L1.

[0043] Figure 4 is a flowchart of another equalization resistor temperature rise control method provided in the embodiment of this application. Referring to Figure 4, optionally, the equalization conditions include a voltage difference 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.

[0044] 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 withstand voltage that may cause damage to the internal components of the battery cluster.

[0045] The equalization resistor temperature rise control method includes:

[0046] 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.

[0047] S220. Determine whether the voltage difference meets the balancing condition. If the voltage difference meets the balancing condition, execute S230; if the voltage difference does not meet the balancing condition, execute S240 or S250.

[0048] S230, The equalization module controlling the second battery cluster connects the battery pack in the second battery cluster to the bus. The equalization module includes an equalization resistor.

[0049] 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 be turned on.

[0050] For example, when the voltage difference is less than the first preset voltage threshold, it means that the voltage difference does not meet the balancing condition. Therefore, no balancing is performed, and the second battery cluster is directly powered by high voltage according to the normal power circuit. That is, the first power-on module of the second battery cluster is turned on, which means the main positive relay of the second battery cluster is closed.

[0051] S250: When the voltage difference is greater than the second preset voltage threshold, control the first battery cluster to power down and the second battery cluster to remain inactive.

[0052] For example, when the voltage difference is greater than the second preset voltage threshold, it indicates that the voltage difference at this moment 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 "balance fault" and control the first battery cluster to power down and the second battery cluster to not operate.

[0053] S260: Obtain the temperature of the equalizing resistor in the second battery cluster through the temperature monitoring module, and determine whether the temperature of the equalizing resistor meets the cooling conditions. If the temperature of the equalizing resistor meets the cooling conditions, then execute S270. If the temperature of the equalizing resistor does not meet the cooling conditions, then execute S280 or S290.

[0054] Optionally, the cooling conditions include the temperature of the equalizing resistor being greater than or equal to a first preset temperature threshold and less than or equal to a second preset temperature threshold; where the first preset temperature threshold is less than the second preset temperature threshold.

[0055] 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℃. The second preset temperature threshold is the maximum temperature that may cause damage to the internal components of the battery cluster. For example, the second preset temperature threshold is set to 170℃.

[0056] S270, Perform a cooling operation on the equalization resistor.

[0057] S280: When the temperature of the equalizing resistor is greater than the second preset temperature threshold, control the first and second battery clusters to power off until the temperature of the equalizing resistor is less than or equal to the third preset temperature threshold, then execute step S210. The third preset temperature threshold is less than the second preset temperature threshold.

[0058] For example, when the temperature of the balancing resistor exceeds 170°C, the first and second battery clusters are powered down. Specifically, the first battery cluster disconnects the main positive relay in the first power-on module, and the second battery cluster disconnects the first switch in the balancing module. The balancing resistor is then allowed to cool until its temperature is less than or equal to a third preset temperature threshold. Afterward, a power-on command is sent back to the first battery cluster to activate its first power-on module, and the voltage difference between the first and second battery clusters is obtained. The third preset temperature threshold is preset based on room temperature.

[0059] S290. When the temperature of the equalization resistor is less than the first preset temperature threshold, the cooling module of the second battery cluster is turned off.

[0060] For example, when the temperature of the equalizing resistor is less than 100°C, there is no need to cool the equalizing resistor, that is, the cooling module of the second battery cluster is turned off.

[0061] The technical solution provided in this application compares the voltage difference with a first preset voltage threshold and a second preset voltage threshold. When the voltage difference meets 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 bus. 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 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 not operated. By comparing the temperature of the balancing resistor with a first preset temperature threshold and a second preset temperature threshold, a cooling operation is performed on the balancing resistor when its temperature meets the cooling condition (i.e., 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). When the temperature of the balancing resistor is greater than the second preset temperature threshold, the first and second battery clusters are intermittently balanced; that is, the first and second battery clusters are powered off, and the temperature of the balancing resistor is allowed to settle to room temperature. After the temperature of the balancing resistor has settled to room temperature, a power-on command is sent to the first battery cluster to turn on the first power-on module of the first battery cluster and the voltage difference between the first and second battery clusters is obtained. When the temperature of the balancing resistor is less than the first preset temperature threshold, the cooling module of the second battery cluster is turned off. Based on the different control strategies corresponding to different temperatures, effective control of the temperature rise of the balancing resistor is achieved, effectively improving system safety, reliability, and the lifespan of the balancing resistor.

[0062] Figure 5 is a flowchart of another equalizing resistance temperature rise control method provided in an embodiment of this application. Referring to Figure 5, optionally, after S270, the method further includes:

[0063] S310. Determine whether the voltage difference is less than the first preset voltage threshold.

[0064] If the voltage difference is less than the first preset voltage threshold, then execute S320; if the voltage difference is greater than the second preset voltage threshold, then execute S250.

[0065] S320: The equalization module of the second battery cluster is disconnected, and the first power-on module is closed.

[0066] For example, it is determined whether the voltage difference is less than the first preset voltage threshold. If the voltage difference is less than the first preset voltage threshold, no balancing is performed. The balancing module of the second battery cluster needs to be disconnected, and the second battery cluster is powered on with high voltage according to the normal power circuit. That is, after disconnecting the balancing module of the second battery cluster, the first power-on module of the second battery cluster is controlled to close, which means controlling the main positive relay of the second battery cluster to close.

[0067] Referring again to Figure 3, optionally, the battery pack also includes a second power-on module 70, and 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 equalization module 30, and the negative terminal of the battery pack is connected to the second bus L2 through the second power-on module 70.

[0068] The equalization resistance temperature rise control method also includes:

[0069] Send a power-on command to the first battery cluster to turn on the second power-on module of the first battery cluster;

[0070] The second power-on module includes a main negative relay.

[0071] When the voltage difference determines that the equalization condition is met, the second power-on module of the second battery cluster is kept on, and the equalization module of the second battery cluster is controlled to connect the battery pack in the second battery cluster to the second bus.

[0072] 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. When the second battery cluster is powered on, both the first switch in the equalization module of the second battery cluster and the main negative relay of the second power-on module are closed.

[0073] Referring to Figure 2, the system includes at least two battery clusters and a main control module 50. The battery clusters include a battery pack 10, a temperature monitoring module 20, an equalization module 30, and a first power-on module 40. The battery pack 10 is connected to the bus via the first power-on module 40 or the equalization module 30. The main control module 50 is connected to the temperature monitoring module 20, the equalization module 30, and the first power-on module 40, respectively.

[0074] The main control module 50 is configured to send a power-on command to the first battery cluster A1 to turn on the first power-on module 40 of the first battery cluster A1, and to obtain the voltage difference between the first battery cluster A1 and the second battery cluster A2.

[0075] The main control module 50 is also configured to control the equalization module 30 of the second battery cluster A2 to connect the battery pack in the second battery cluster A2 to the bus when the equalization condition is met based on the voltage difference. The equalization module includes an equalization resistor R.

[0076] The main control module 50 is also configured to obtain the temperature of the equalization resistor R in the second battery cluster A2 through the temperature monitoring module 20, and to perform a cooling operation on the equalization resistor R when the temperature of the equalization resistor R meets the cooling conditions.

[0077] The equal resistance temperature rise control system provided in this application can execute the equal resistance temperature rise control method provided in any embodiment of this application, and has the corresponding functional modules and technical effects of the method.

[0078] Figure 6 is a schematic diagram of another equalization resistance temperature rise control system provided in an embodiment of this application. Referring to Figure 6, the main control module 50 includes a first-level control module 51 and a second-level control module 52. The first-level control module 51 is connected to the second-level control module 52, and the second-level control module 52 is set up one-to-one with the battery clusters. The battery clusters also include a cooling module 60 and a second power-on module 70. The second-level control module 52 is connected to the temperature monitoring module 20, equalization module 30, first power-on module 40, cooling module 60 and second power-on module 70 of the corresponding battery clusters.

[0079] The first-level control module 51 is configured to send a power-on command to the first battery cluster through the second-level control module 52 to enable the first power-on module 40 and the second power-on module 70 of the first battery cluster to be turned on, and to obtain the voltage difference between the first battery cluster A1 and the second battery cluster A2 through the second-level control module 52.

[0080] The first-level control module 51 is also configured to, when the equalization condition is met based on the voltage difference, control the equalization module 30 and the second power-on module 70 of the second battery cluster A2 to connect the battery pack in the second battery cluster A2 to the bus through the second-level control module 52.

[0081] The first-level control module 51 is also configured to obtain the temperature of the equalization resistor R in the second battery cluster A2 through the second-level control module 52 and the temperature monitoring module 20. When the temperature of the equalization resistor R meets the cooling conditions, the second-level control module 52 controls the cooling module 60 of the second battery cluster A2 to be turned on.

[0082] It should be understood that the various processes shown above can be used to rearrange, add, or delete steps. For example, the multiple steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this application can be achieved, and this is not limited herein.

Claims

1. A method for controlling the temperature rise of equalizing resistance, used in an equalizing resistance temperature rise control system, the equalizing resistance temperature rise control system comprising at least two battery clusters, each battery cluster comprising a battery pack, a temperature monitoring module, an equalizing module, and a first power-on module, the battery pack being connected to a bus via the first power-on module or the equalizing module; the at least two battery clusters comprising a first battery cluster and a second battery cluster; The equalization resistance temperature rise control method includes: 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; When the equalization condition is met based on the voltage difference, the equalization module of the second battery cluster controls the battery pack in the second battery cluster to connect to the bus. The equalization module includes an equalization resistor. The temperature of the equalizing resistor in the second battery cluster is obtained through the temperature monitoring module. When the temperature of the equalizing resistor meets the cooling conditions, a cooling operation is performed on the equalizing resistor.

2. The method for controlling temperature rise of equalizing resistance according to claim 1, wherein, The battery cluster also includes a cooling module; The step of obtaining the temperature of the equalizing resistor in the second battery cluster through the temperature monitoring module, and performing a cooling operation on the equalizing resistor when the temperature of the equalizing resistor meets the cooling conditions, includes: The temperature of the equalizing resistor in the second battery cluster is obtained through the temperature monitoring module. When the temperature of the equalizing resistor meets the cooling conditions, the cooling module of the second battery cluster is activated to cool the equalizing resistor.

3. The method for controlling temperature rise of equalizing resistance according to claim 1, wherein, The equalization module includes a first switch and an equalization resistor, which are connected in series between the battery pack and the bus. When the equalization condition is determined to be met based on the voltage difference, controlling the equalization module of the second battery cluster to connect the battery pack in the second battery cluster to the bus includes: When the voltage difference determines that the equalization condition is met, the first switch of the second battery cluster is controlled to close.

4. The method for controlling temperature rise of equalizing resistance according to claim 1, wherein, The equalization condition includes the voltage difference being greater than or equal to a first preset voltage threshold and less than or equal to a second preset voltage threshold. The equalization resistance temperature rise control method also includes: When the voltage difference is less than the first preset voltage threshold, the first power-on module of the second battery cluster is turned on. When the voltage difference is greater than the second preset voltage threshold, the first battery cluster is powered down and the second battery cluster is not activated.

5. The method for controlling temperature rise of equalizing resistance according to claim 1, wherein, The cooling conditions include the temperature of the equalizing resistor being greater than or equal to a first preset temperature threshold and less than or equal to a second preset temperature threshold. The equalization resistance temperature rise control method also includes: When the temperature of the equalizing resistor is greater than the second preset temperature threshold, the first battery cluster and the second battery cluster are powered down until the temperature of the equalizing resistor is less than or equal to the third preset temperature threshold. Then, a power-on command is sent to the first battery cluster 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. The third preset temperature threshold is less than the second preset temperature threshold. When the temperature of the equalizing resistor is lower than the first preset temperature threshold, the cooling module of the second battery cluster is controlled to shut down.

6. The equalizing resistor temperature rise control method according to claim 1, after performing a cooling operation on the equalizing resistor when the temperature of the equalizing resistor meets the cooling condition, further includes: Determine whether the voltage difference is less than a first preset voltage threshold; In response to the determination that the voltage difference is less than a first preset voltage threshold, the equalization module of the second battery cluster is disconnected and the first power-on module is closed. In response to the determination that the voltage difference is greater than the second preset voltage threshold, the first battery cluster is powered down and the second battery cluster is not activated.

7. The method for controlling temperature rise of equalizing resistance according to claim 1, wherein, The battery pack also includes a second power-on module, and 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 equalization module, and the negative terminal of the battery pack is connected to the second bus through the second power-on module. The equalization resistance temperature rise control method also includes: Send a power-on command to the first battery cluster to turn on the second power-on module of the first battery cluster; When the equalization condition is met based on the voltage difference, the second power-on module of the second battery cluster is kept on, and the equalization module of the second battery cluster is controlled to connect the battery pack in the second battery cluster to the second bus.

8. The method for controlling temperature rise of equalizing resistance according to claim 1, wherein, The first battery cluster and the second battery cluster are arranged adjacent to each other.

9. A balanced resistance temperature rise control system, comprising at least two battery clusters and a main control module, wherein the battery clusters include a battery pack, a temperature monitoring module, a balancing module and a first power-on module, and the battery pack is connected to a bus via the first power-on module or the balancing module; The main control module is connected to the temperature monitoring module, the equalization module and the first power-on module respectively; The main control module is configured to send a power-on command to the first battery cluster to turn on the first power-on module of the first battery cluster, and to obtain the voltage difference between the first battery cluster and the second battery cluster. The main control module is further configured to control the equalization module of the second battery cluster to connect the battery pack in the second battery cluster to the bus when the equalization condition is met based on the voltage difference. The equalization module includes an equalization resistor. The main control module is further configured to obtain the temperature of the equalizing resistor in the second battery cluster through the temperature monitoring module, and to perform a cooling operation on the equalizing resistor when the temperature of the equalizing resistor meets the cooling conditions.

10. The equalization resistance temperature rise control system according to claim 9, wherein, 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 configured to correspond one-to-one 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 equalization module, the first power-on module, the cooling module, and the second power-on module of the corresponding battery cluster. The first-level control module is configured to send a power-on command to the first battery cluster through the second-level control module to enable the first power-on module and the second power-on module of the first battery cluster to be turned on, and to 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 also configured to, when determining that the equalization condition is met based on the voltage difference, control the equalization module and the second power-on module of the second battery cluster to connect the battery pack in the second battery cluster to the bus via the second-level control module; The first-level control module is further configured to obtain the temperature of the equalizing resistor in the second battery cluster through the second-level control module and the temperature monitoring module, and when the temperature of the equalizing resistor meets the cooling conditions, control the second-level control module to turn on the cooling module of the second battery cluster.

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