Battery heating method, apparatus and system, battery pack, battery module heating control circuit, energy storage system and readable medium

Abstract

Disclosed in the present application are a battery heating method, apparatus and system, a battery pack, a battery module heating control circuit, an energy storage system and a readable medium. The battery heating method comprises: receiving a battery heating request which is sent by a second controller of a battery; in response to the battery heating request, acquiring at least one of energy information and management information of an energy supply end of an inverter; if at least one of the energy information and the management information meets a preset heating condition, generating a heating allowance instruction; sending the heating allowance instruction to the second controller of the battery, so that the second controller establishes an electrical connection between a heating apparatus and an output end of the inverter; and controlling the inverter to use the energy supply end to supply power to the heating apparatus, so as to heat the battery. By means of the present application, a battery can be heated in real time, thereby preventing the battery from operating under low-temperature conditions, satisfying the charge / discharge requirements of the battery, saving on photovoltaic energy, and prolonging the service life of the battery.

Description

Battery heating method, device and system, battery pack, battery pack heating control circuit, energy storage system and readable medium Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a battery heating method, device and system, a battery pack, a battery pack heating control circuit, an energy storage system and a readable medium. Background Art

[0002] Inverters paired with batteries for energy storage may not be able to effectively utilize batteries in low-temperature conditions. In some regions, winter temperatures can reach -30°C, rendering batteries inoperable at such temperatures. For example, if a user's home load requires battery discharge to maintain power, or if the inverter's photovoltaic energy needs to be stored in batteries, these batteries cannot function effectively in low-temperature conditions.

[0003] Summary of the Invention

[0004] The battery heating method, device and system, and battery pack provided in the embodiments of the present application can at least heat the battery in real time to ensure the normal operation of the battery.

[0005] According to a first aspect of the present application, a battery heating method is provided, which is applied to a first controller of an inverter, wherein the battery is arranged in a battery pack, and a heating device is provided in the battery pack; the battery heating method comprises: receiving a battery heating request sent by a second controller of the battery, wherein the battery heating request is generated by the second controller when it is determined based on the acquired battery cell temperature that the battery needs to perform a heating operation and the battery does not meet the self-heating condition; in response to the battery heating request, obtaining at least one item of energy information and management information of the energy supply end of the inverter; if at least one item of the energy information and management information meets the preset heating condition, generating a heating permission instruction; sending the heating permission instruction to the second controller of the battery so that the second controller establishes an electrical connection between the heating device and the output end of the inverter; and controlling the inverter to use the energy supply end to power the heating device to heat the battery.

[0006] According to the second aspect of the present application, a battery heating method is also provided, which is applied to the second controller of the battery, the battery and the second controller are arranged in a battery pack, and a heating device is provided in the battery pack; the battery heating method includes: obtaining the battery cell temperature; generating a battery heating request when determining that the battery cell temperature is lower than a second temperature threshold and the battery does not meet the self-heating condition; sending the battery heating request to the first controller of the inverter; receiving a heating permission instruction sent by the first controller; establishing an electrical connection between the heating device and the output end of the inverter according to the heating permission instruction, so that the first controller controls the inverter to use the energy supply end to power the heating device to heat the battery, wherein the heating permission instruction is generated by the first controller when at least one item of the energy information and the management information meets the preset heating condition.

[0007] According to the third aspect of the present application, a battery heating device is also provided, including a first converter, a second converter, an inverter, a relay and a first controller; the first port of the first converter is electrically connected to the photovoltaic panel, the second port of the first converter is electrically connected to the first port of the inverter, the second port of the inverter is electrically connected to the power grid through the relay, the first port of the inverter is electrically connected to the second port of the second converter, and the first port of the second converter is electrically connected to the battery; the first controller is used to execute the battery heating method of the first aspect above.

[0008] According to the fourth aspect of the present application, a battery pack is also provided, comprising: a battery, a heating device, a first switch group, a second switch group, a relay and a second controller of the battery, the heating device being electrically connected to the battery through the first switch group, and the heating device being electrically connected to the interface of the battery pack through the second switch group and the relay; and a second controller for executing the battery heating method of the second aspect above.

[0009] According to a fifth aspect of the present application, a battery heating system is also provided, comprising the battery heating device of the third aspect and the battery pack of the fourth aspect; a first controller is communicatively connected with a second controller.

[0010] According to a sixth aspect of the present application, a non-transitory computer-readable storage medium storing computer instructions is further provided, wherein the computer instructions are used to enable a computer to execute the battery heating method steps of the first and second aspects.

[0011] According to the seventh aspect of the present application, a battery pack heating control circuit is also provided, including: a first external port, a second external port, a third external port, a fourth external port, a heating device, a first switch group, a second switch group, a first temperature sampling circuit, a second temperature sampling circuit and a controller; the controller is electrically connected to the second temperature sampling circuit and the first temperature sampling circuit, respectively, so as to use the second temperature sampling circuit to collect the temperature value of the battery pack, and to use the first temperature sampling circuit to collect the temperature value of the heating device; the controller is electrically connected to the first switch group and the second switch group, respectively, the first switch group is electrically connected to the heating device, the third external port and the first external port, respectively, and the second switch group is electrically connected to the heating device, the fourth external port and the second external port, respectively, so as to use the first switch group and the second switch group to control the power-on status between the first external port, the second external port and the heating device, and to control the power-on status between the third external port, the fourth external port and the heating device.

[0012] According to the eighth aspect of the present application, a battery pack is also provided, comprising a battery pack and the battery pack heating control circuit of the seventh aspect, wherein the battery pack heating control circuit is electrically connected to the battery pack through a third external port and a fourth external port.

[0013] According to the ninth aspect of the present application, an energy storage system is also provided, comprising an energy storage inverter and the battery pack of the eighth aspect, wherein the energy storage inverter is electrically connected to the battery pack via a first external port and a second external port.

[0014] Beneficial effects of the embodiments of the present application:

[0015] The battery heating method of the first aspect of the present application is applied to the first controller of the inverter, the battery is arranged in the battery pack, and the battery pack is also provided with a heating device; the battery heating method comprises: upon receiving a battery heating request, obtaining energy information and / or management information of the energy supply end of the inverter; if the energy information and / or management information meets the preset heating conditions, generating a heating permission instruction, sending the heating permission instruction to the second controller of the battery, so that the second controller establishes an electrical connection between the heating device and the output end of the inverter, and sending a heating preparation completion signal to the first controller; upon receiving the heating preparation completion signal, controlling the inverter to use the energy supply end to power the heating device to heat the battery. The embodiment of the present application can heat the battery in real time, avoid the battery from operating under low temperature conditions, ensure the battery's charging and discharging needs, save photovoltaic energy, and extend the battery's service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other embodiments can be derived from these drawings without inventive effort.

[0017] FIG1 is a flow chart 1 of a battery heating method according to an embodiment of the present application.

[0018] FIG2 is a second flow chart of the battery heating method according to an embodiment of the present application.

[0019] FIG3 is a flow chart of the PCS battery heating function according to an embodiment of the present application.

[0020] FIG4 is a schematic structural diagram of the electronic device of this embodiment.

[0021] FIG5 is a flow chart of the BMS battery heating function according to an embodiment of the present application.

[0022] FIG6 is a wiring diagram of a hybrid energy storage system according to an embodiment of the present application.

[0023] FIG7 is a schematic diagram of the internal circuit of the battery pack according to an embodiment of the present application.

[0024] FIG8 is a schematic diagram of the internal circuit of the PCS according to an embodiment of the present application.

[0025] FIG9 is a circuit diagram of a DC / DC converter in a PCS according to an embodiment of the present application.

[0026] FIG10 is a block diagram of a battery heating voltage control according to an embodiment of the present application.

[0027] FIG11 is a schematic diagram of another internal circuit of a battery pack according to an embodiment of the present application.

[0028] FIG12 is a schematic diagram of the battery pack heating control circuit structure disclosed in this application.

[0029] FIG13 is a heating control circuit diagram disclosed in this application.

[0030] FIG14 is a first schematic diagram of the internal structure of the first switch group and the second switch group disclosed in this application.

[0031] FIG15 is a second schematic diagram of the internal structure of the first switch group and the second switch group disclosed in this application.

[0032] FIG16 is a schematic diagram showing the arrangement of the NTC thermistor disclosed in this application in a battery pack. DETAILED DESCRIPTION

[0033] The following describes embodiments of the present invention in more detail with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0034] As described in the background art, in some areas, the lowest temperature in winter may reach minus 30 degrees Celsius. At such a temperature, the battery cannot work.

[0035] Therefore, to heat the battery in real time and ensure its normal operation, this application provides a battery heating method, device, system, and battery pack. This battery heating method heats the battery to achieve ideal operating conditions at low temperatures, meeting charging and discharging requirements and conserving photovoltaic energy. The battery heating technology also prevents forced discharge of the battery at low temperatures, thus reducing its service life.

[0036] It should be understood that the battery heating method in the embodiments of the present application can also be applied to a battery pack. The following embodiments are only illustrated by taking a battery or a battery pack as an example.

[0037] In an embodiment of the present application, a battery heating method is provided. The battery heating method is applied to the first controller of the inverter. The battery is arranged in a battery pack, and a heating device is also provided in the battery pack. FIG1 is a flowchart of the battery heating method according to an embodiment of the present application. The method steps involved in FIG1 are described below.

[0038] Step S101 : receiving a battery heating request sent by a second controller of the battery, wherein the battery heating request is generated by the second controller when it determines based on the acquired battery cell temperature that the battery needs to perform a heating operation and the battery does not meet a self-heating condition.

[0039] Step S102 : In response to the battery heating request, obtaining at least one of energy information and management information of an energy supply end of the inverter.

[0040] In this step, the energy supply end is a device that can be used to provide energy to the inverter. For example, the energy supply end can be a power grid or a device that can provide energy such as wind energy, solar energy, etc. The specific type of energy supply end used can be set according to actual needs, and the embodiments of the present application do not specifically limit this. Energy information can be used to describe energy-related information such as the energy intensity and energy status of the energy supply end. Management information can be used to describe the user's management needs. For example, it can include but is not limited to: the time when the user needs to use energy, the user's requirements for the intensity and type of energy, etc. The inverter can be used to convert the energy provided by the energy supply end into alternating current. For example, the direct current provided by the energy supply end is converted into alternating current.

[0041] In this step, the controller used to control the inverter is used as the first controller. The first controller can be in communication with the inverter. The controller used to control the battery is used as the second controller. The second controller can be located within the battery pack, which can also include a heating device. The heating device can be a heating plate or heating wire. The first and second controllers are in communication with each other. The second controller sends a battery heating request to the first controller, which requests the inverter to heat the battery.

[0042] Step S103: If at least one of the energy information and the management information meets the preset heating condition, a heating permission instruction is generated.

[0043] Step S104 : sending a heating permission instruction to the second controller of the battery, so that the second controller establishes an electrical connection between the heating device and the output end of the inverter, and sends a heating preparation completion signal to the first controller.

[0044] When the first controller receives a battery heating request, if the energy information and management information meet the preset heating conditions, it generates a heating permission instruction, and sends the heating permission instruction to the second controller of the battery, so that the second controller controls the battery to establish an electrical connection between the heating device and the output end of the inverter. The preset heating conditions can be used to limit the energy information and / or management information, so as to generate a heating permission instruction when user needs are met and / or when there is sufficient energy at the energy supply end. Afterwards, the instruction is sent to the second controller so that after receiving the heating permission instruction, the second controller can prepare for heating based on the instruction, and after completing the heating preparation, send a heating preparation completion signal to the first controller. When the first controller receives the heating preparation completion signal, it controls the inverter to use the heating device at the energy supply end to supply power to heat the battery.

[0045] It should be understood that the process of the second controller sending a heating preparation completion signal to the first controller is optional. The first controller can also control the inverter to use the energy supply end to power the heating device directly or after a preset time after sending a heating permission instruction to the controller.

[0046] It should be noted that the second controller performs heating preparation, that is, the second controller establishes an electrical connection between the heating device and the output terminal of the inverter. Referring to the internal circuit diagram of the battery pack shown in Figure 7, the battery pack may include a cell group 71, a second controller 72 (shown as a BMS controller 72 in the figure), a first switch S4, a second switch S5, a third switch S6, and a heating device 73. When the second controller 72 performs heating preparation, it can control the first switch S4 and the second switch S5 to be disconnected and the third switch S6 to be closed, thereby connecting the positive and negative poles of the battery pack to the output terminal of the inverter, so that the inverter uses the energy supply end to heat the heating device 73.

[0047] It should be noted that the battery in the embodiment of the present application may be a lithium battery, a sodium battery, or the like, which may be easily affected in normal use by low temperatures.

[0048] In this step, energy and management information from the inverter's energy supply are acquired to provide data support for the subsequent battery heating control process. This information, along with the preset heating conditions, determines whether heating is permitted. This ensures the normal and continuous operation of the heating process, preventing situations such as heating interruption due to insufficient energy from the energy supply or heating without user intent, thus ensuring the continuity and effectiveness of heating.

[0049] Step S105 , upon receiving the heating preparation completion signal, controlling the inverter to utilize the energy supply end heating device to supply power to heat the battery.

[0050] In this step, when the heating preparation completion signal is received, the inverter is controlled to use the energy provided by the energy supply end to power the heating device, thereby increasing the temperature of the heating device. The heating device is set inside the battery pack to achieve heating of the battery.

[0051] In an embodiment of the present application, a battery heating method is provided. The battery heating method is applied to a first controller of an inverter, wherein the battery is disposed in a battery pack, and a heating device is also disposed in the battery pack. The battery heating method comprises: upon receiving a battery heating request, obtaining energy information and management information from an energy supply terminal of the inverter; if the energy information and management information meet preset heating conditions, generating a heating permission instruction, sending the heating permission instruction to a second controller of the battery so that the second controller establishes an electrical connection between the heating device and an output terminal of the inverter, and sending a heating preparation completion signal to the first controller; upon receiving the heating preparation completion signal, controlling the inverter to utilize the energy supply terminal to power the heating device to heat the battery. The embodiment of the present application can heat the battery in real time, avoid the battery from operating under low temperature conditions, ensure the battery's charging and discharging requirements, save photovoltaic energy, and extend the battery's service life.

[0052] In one possible embodiment, when the inverter is in grid-connected mode, the energy supply end includes a photovoltaic panel and a power grid; obtaining management information of the energy supply end of the inverter can be performed according to the following steps: obtaining the grid-connected power information of the photovoltaic panel and the power grid, the battery AC power conversion efficiency information and the battery heating power information, and using the grid-connected power information, the battery AC power conversion efficiency information and the battery heating power information as management information; if the energy information and the management information meet the preset heating conditions, it can be performed according to the following steps: if the product of the grid-connected power information and the battery AC power conversion efficiency information is greater than the battery heating power information, it is determined that the energy information and the management information meet the preset heating conditions; controlling the inverter to use the energy supply end to power the heating device can be performed according to the following steps: controlling the inverter to use the photovoltaic panel to power the heating device.

[0053] In this possible implementation, grid-connected mode involves connecting a distributed energy system (such as a solar photovoltaic system or wind power generation system) to the power grid, enabling it to inject the generated electricity into the grid. In grid-connected mode, the distributed energy system can both supply power to the grid and draw power from it. In this mode, bidirectional power flow can be achieved between the distributed energy system and the grid, balancing the grid's load demand and energy supply.

[0054] In this possible embodiment, a photovoltaic panel, also known as a solar panel or solar photovoltaic panel, is a device that converts sunlight into electricity. It consists of multiple solar cells that convert sunlight into electricity through the photoelectric effect. The power grid is the electrical system consisting of transmission lines, substations, and distribution stations, used to transmit and distribute electricity generated by power plants to various users.

[0055] The grid-connected power information of the photovoltaic panels and the grid, the battery AC power conversion efficiency information, and the battery heating power information are obtained and used as management information. The grid-connected power information of the photovoltaic panels and the grid can be obtained by the inverter through the grid-connected power meter. The battery AC power conversion efficiency information is used to indicate the conversion efficiency of AC power to battery power. The battery AC power conversion efficiency value can be set according to actual needs. The battery heating power information can be obtained from the second controller through communication between the first controller and the second controller.

[0056] In this possible implementation, in grid-connected mode, if the product of the grid-connected power information and the battery AC power conversion efficiency information is greater than the battery heating power information, this indicates that the current PV panel output power converted into AC power, in addition to supplying local loads, the excess grid-connected power can meet the power loss of battery heating. This means that enabling the battery heating function only consumes energy from the PV panel, and the user does not need to spend extra money to purchase electricity for battery heating. At this point, the heating condition is met. When the product of the grid-connected power information and the battery AC power conversion efficiency information is greater than the battery heating power information, the inverter is controlled to use the PV panel to power the heating device.

[0057] In one possible embodiment, when the inverter is in grid-connected mode, the energy supply end includes the power grid; obtaining management information of the energy supply end of the inverter can be performed according to the following steps: obtaining the power supply management information of the power grid, and using the power supply management information as management information; if the energy information and management information meet the preset heating conditions, it can be performed according to the following steps: determining the target heating time period according to the battery heating request, and determining the power supply time period and heating indication information according to the power supply management information; if the target heating time period is within the power supply time period, and the heating indication information is used to indicate that heating is allowed, it is determined that the energy information and management information meet the preset heating conditions; controlling the inverter to use the energy supply end to power the heating device can be performed according to the following steps: controlling the inverter to use the power grid to power the heating device.

[0058] In this possible implementation, the power grid refers to an electric power system consisting of transmission lines, substations, distribution stations, etc., which is used to transmit and distribute electric energy generated by power plants to various users.

[0059] Power supply management information from the power grid is obtained and used as management information. The power supply management information includes a user-set heating time period and indication information indicating whether to draw power from the power grid to heat the battery during the heating time period. It should be noted that other types of management information can also be set according to actual needs and are not specifically limited in this embodiment of the application.

[0060] In this possible implementation, the heating indication information is used to indicate whether the user indicates permission to draw power from the grid for battery heating, or whether the user indicates permission not to draw power from the grid for battery heating. In grid-connected mode, during the user-set heating time period, drawing power from the mains to heat the battery is permitted, and when the heating conditions are met, the target heating time period is determined based on the battery heating request, and the power supply time period and heating indication information are determined based on the power supply management information. If the target heating time period is within the power supply time period and the heating indication information indicates permission for heating, the energy information and management information are determined to meet the preset heating conditions. If the target heating time period is within the power supply time period and the heating indication information indicates permission for heating, the inverter is controlled to use the grid to power the heating device.

[0061] In one possible embodiment, when the inverter is in off-grid mode, the energy supply end includes a photovoltaic panel, and obtaining the energy information of the energy supply end of the inverter can be performed according to the following steps: obtaining the voltage value of the photovoltaic panel, and using the voltage value of the photovoltaic panel as the energy information; if the energy information and management information meet the preset heating conditions, it can be performed according to the following steps: if the voltage value of the photovoltaic panel is greater than the preset voltage threshold, it is determined that the energy information and management information meet the preset heating conditions; controlling the inverter to use the energy supply end to power the heating device can be performed according to the following steps: controlling the inverter to use the photovoltaic panel to power the heating device.

[0062] In this possible embodiment, a photovoltaic panel, also known as a solar panel or solar photovoltaic panel, is a device that can convert sunlight into electrical energy. It is composed of multiple solar cells that convert light energy in sunlight into electrical energy through the photoelectric effect.

[0063] In this possible implementation, off-grid mode refers to disconnecting the distributed energy system from the power grid, enabling it to operate independently, independent of grid power. In off-grid mode, the distributed energy system stores energy using its own energy storage devices (such as batteries and supercapacitors) and provides power when needed. In this mode, the distributed energy system does not interact with the grid and can operate independently.

[0064] The voltage value of the photovoltaic panel is obtained in real time, and the voltage value of the photovoltaic panel is used as energy information to determine whether the photovoltaic panel can provide energy for heating the battery.

[0065] In this possible implementation, when the inverter is in off-grid mode, if photovoltaic energy is detected, the battery heating condition is met. Specifically, if the photovoltaic panel voltage is greater than a preset voltage threshold, the energy information and management information are determined to meet the preset heating condition. The preset voltage threshold can be determined according to the specification. For example, the voltage threshold can be set to 200V.

[0066] When the PV panel voltage exceeds a voltage threshold, the system determines, based on the energy information and management information, that the preset heating conditions are met. At this point, the inverter is controlled to use the PV panel to power the heating device. It should be noted that initiating battery heating causes the PV panel voltage to decrease. If it falls below the voltage threshold, battery heating ceases and, after a certain period of time, reassessment is made to determine whether the preset heating conditions are met.

[0067] In one possible embodiment, controlling the inverter to power the heating device can be performed according to the following steps: obtaining the resistance value of the heating device and the target battery heating power value; calculating the target voltage value based on the resistance value and the target battery heating power value; and controlling the inverter to use the energy supply end to power the heating device according to the target voltage value.

[0068] In this possible implementation, the target battery heating power value may be the minimum heating power value of the battery. The target voltage value may be calculated based on the resistance value and the target battery heating power value according to the following formula: Where U1 represents the target voltage, P1 represents the target battery heating power, and R represents the resistance. The first controller controls the output voltage to a constant voltage U1 to power the heating device and ensure heating stability.

[0069] In a possible implementation, the following steps may also be performed: upon receiving a self-heating request, disconnecting the electrical connection between the output terminal of the inverter and the heating device, and sending a self-heating permission instruction to the second controller.

[0070] In this possible implementation, the self-heating request is used to request that the battery be used as a power source for heating the heating device. Upon receiving the self-heating request, the electrical connection between the inverter output and the heating device is disconnected, thereby enabling the heating device to connect to the battery. A self-heating enable instruction is sent to the second controller. Upon receiving the self-heating enable instruction, the second controller establishes an electrical connection between the battery and the heating device in accordance with the instruction, controlling the battery to power the heating device to heat the battery.

[0071] In one possible implementation, the battery heating request is generated by the second controller when the battery cell temperature is lower than a second temperature threshold; the second controller is further configured to generate a self-heating request when the battery cell temperature is lower than the first temperature threshold and higher than the second temperature threshold.

[0072] Referring to the PCS (Power Conversion System) battery heating function flow chart shown in Figure 3 and the BMS (Battery Management System) battery heating function flow chart shown in Figure 5, the following describes the battery heating control steps using a specific embodiment. It should be noted that in Figure 8, PCS controller 81 is an embodiment of the first controller, and in Figure 7, BMS controller 72 is an embodiment of the second controller.

[0073] First, the battery pack may include batteries, a BMS management system, a heating device and an insulation device. The BMS management system of the battery collects the battery cell temperature in real time and interacts and communicates with the controller of the inverter. When it is detected that the battery temperature in the battery cell is too low, the BMS management system first determines whether the battery itself has the battery heating conditions. When the battery meets its own heating conditions, see Figure 7, the BMS management system controls the closing of the first switch S4, the second switch S5, and the third switch S6 shown in Figure 7, and the battery heats the heating device 73; when the BMS management system determines that the battery itself does not have the heating conditions, the BMS management system controls the disconnection of the first switch S4 and the second switch S5, the closing of the third switch S6, and sends a battery heating request to the inverter, requesting the inverter to heat the heating device 73.

[0074] The inverter heats the battery in the following steps:

[0075] 1. As shown in Figure 8, the inverter can obtain grid-connected power information through the grid-connected side meter, which is recorded as Pac;

[0076] 2. As shown in Figure 9, the inverter can obtain the photovoltaic panel voltage Upv, photovoltaic panel current Ipv, battery voltage Ubat and battery current Ibat through voltage sampling and current sampling, thereby obtaining the panel output power Ppv and battery power Pbat;

[0077] 3. As shown in Figure 6, the PCS controller chip in the inverter can establish a communication connection with the BMS controller chip in the battery through communication to obtain the minimum battery heating power, that is, the target battery heating power value P1;

[0078] 4. Set the conversion efficiency of AC power to battery power and obtain the battery AC power conversion efficiency information, recorded as μ;

[0079] 5. The inverter provides users with the ability to enable the battery heating function and the time period during which electricity is purchased from the mains to heat the battery.

[0080] 6. When the user sets the heating enable, the heating condition is determined;

[0081] 7. In grid-connected mode, when the meter power Pac×μ>P1, the current PV panel output power Ppv is converted to AC power through the DC / DC1 converter and the DC / AC converter. In addition to supplying local loads, the excess grid-connected power Pac can meet the power loss of battery heating. This means that turning on the battery heating function only consumes energy from the PV panel, and users do not need to spend extra money to buy electricity for battery heating. At this time, the heating conditions are met;

[0082] 8. In grid-connected mode, during the user-set heating time period, it is allowed to draw power from the mains to heat the battery, and the heating conditions are met at this time;

[0083] 9. In off-grid mode, if photovoltaic energy is detected, the battery heating conditions are met;

[0084] 10. As shown in Figures 3 and 5, respectively, the PCS battery heating function flow chart and the BMS battery heating flow chart, according to the flow chart, the inverter PCS controller and the battery BMS controller establish a communication connection through the communication line to complete the data exchange of the battery heating function;

[0085] 11. The PCS controller determines whether the battery heating conditions are met. Then, through interactive command information, the BMS controller completes the preparation work for battery heating and connects the heating device to the inverter battery input port through a relay;

[0086] 12. The PCS controller establishes a constant voltage at the battery port by controlling the voltage loop of the DC / DC2 converter, i.e., the target voltage value U1. The voltage U1 is calculated based on the resistance value R of the battery heater and the battery heating power, i.e., the target battery heating power value P1. The calculation formula is:

[0087] It should be noted that the steps for the PCS controller to establish a constant voltage U1 at the battery port are as follows: First, calculate the target value U2 of the Ubus voltage shown in Figure 9. The formula for the target value is U2 = Uac × 1.414 + 30, where Uac is the effective value of the mains voltage. Then, as shown in Figures 8 and 9, when the output voltage Upv of the photovoltaic panel is less than U2, the PCS controller controls the switch tube S7 of the DC / DC1 converter to operate in the high-frequency switching mode, and the DC / DC1 converter operates in the boost mode to make the Ubus voltage equal to the target value U2. When Upv is greater than U2, the PCS controller controls the switch tube S7 of the DC / DC1 converter to turn off, and the DC / DC1 converter operates in the bypass mode to make the Ubus voltage equal to the output voltage Upv of the photovoltaic panel. As shown in the PCS battery heating function flowchart in Figure 3, the PCS controller can be implemented through the DSP chip. When the PCS controller starts to establish the battery heating voltage, the PCS controller turns on the heating voltage control loop and controls the switch tubes S8 and S9 of the DC / DC2 converter to make the battery port voltage Ubat equal to U1. The control loop block diagram is shown in Figure 10. Figure 10 includes a voltage loop controller 120 and a current loop controller 170. The voltage loop controller 120 and the current loop controller 170 are respectively the controller parts in the control algorithms implemented by code in the DSP chip. Combining Figures 9 and 10, the switching states of the switch tubes S8 and S9 are as follows: when d = 1, the switch tube S8 is disconnected and the switch tube S9 is closed; when d = 0, the switch tube S8 is closed and the switch tube S9 is disconnected.

[0088] 13. When the temperature inside the battery rises to a certain value that can meet the charge and discharge capacity of the battery, the BMS controller inside the battery tells the inverter PCS controller to stop heating through communication, and the heating process ends;

[0089] 14. To prevent the temperature of the battery from dropping again, the internal heating device of the battery can be connected to the battery output voltage terminal to switch to self-heating of the battery.

[0090] This application provides a battery heating method, device, system, and battery pack. This method can be applied to heating the battery. The battery is set in the battery pack, and a heating device and a heat preservation device are also installed in the battery pack. The user can set the battery heating enable and the heating time period allowed to draw power from the mains. The inverter comprehensively judges the battery heating conditions by detecting information such as the energy of the photovoltaic panel and the consumption of the user load. The lithium-ion battery and the inverter interact with the heating steps through BMS communication, and the inverter can implement the battery heating voltage control method.

[0091] The present application also provides a battery heating method, which is applied to a second controller of a battery. The battery and the second controller are disposed in a battery pack, which also includes a heating device. FIG2 is a second flowchart of the battery heating method according to the present application embodiment. The method steps involved in FIG2 are described below.

[0092] It should be understood that the above-mentioned battery heating method can also be applied to a battery pack disposed in a battery pack, and the battery pack may include a plurality of batteries.

[0093] Step S201: obtaining the battery cell temperature.

[0094] Step S202 : generating a battery heating request according to the battery cell temperature, that is, generating a battery heating request when it is determined according to the battery cell temperature that the battery needs to be heated and the battery does not meet the self-heating condition.

[0095] In this step, the controller used to control the inverter is used as the first controller. The first controller can be communicatively connected to the inverter. The controller used to control the battery is used as the second controller. The second controller can be located in the battery pack, which can also include a heating device. The heating device can be a heating plate or a heating wire. The first controller and the second controller are communicatively connected. The second controller can monitor the battery cell temperature in real time and generate a battery heating request when the cell temperature reaches a preset temperature threshold. In this step, the battery heating request is used to request the inverter to heat the battery.

[0096] Step S203: Send the battery heating request to the first controller of the inverter, so that the first controller generates a heating permission instruction when the energy information and management information of the energy supply end of the inverter meet the preset heating conditions.

[0097] In this step, the second controller sends a battery heating request to the first controller, so that when the energy information and management information at the inverter's energy supply end meet preset heating conditions, the first controller generates a heating permission instruction and sends the heating permission instruction to the second controller of the battery. The preset heating conditions can be used to limit the energy information and / or management information, so that the heating permission instruction is generated only when user needs are met and / or when sufficient energy is available at the energy supply end.

[0098] It should be noted that the energy supply end is a device that can be used to provide electrical energy to the inverter. For example, the energy supply end can be a power grid or a device that can convert wind energy, solar energy and other energies into electrical energy. The specific type of energy supply end used can be set according to actual needs, and the embodiments of the present application do not specifically limit this. Energy information can be used to describe energy-related information such as the energy intensity and energy status of the energy supply end. Management information can be used to describe the user's management needs. For example, it can include but is not limited to: the time when the user needs to use energy, the user's requirements for the intensity and type of energy, etc. The inverter can be used to convert the energy provided by the energy supply end into alternating current. For example, the direct current provided by the energy supply end is converted into alternating current.

[0099] Step S204: receiving a heating permission instruction sent by the first controller.

[0100] Step S205: When a heating permission instruction is received, an electrical connection is established between the heating device and the output end of the inverter according to the heating permission instruction, and a heating preparation completion signal is sent to the first controller so that the first controller controls the inverter to use the energy supply end to power the heating device.

[0101] When the second controller receives the instruction to allow heating, it can prepare for heating based on the instruction, and after completing the heating preparation, it sends a heating preparation completion signal to the first controller. The second controller performs heating preparation, that is, establishes an electrical connection between the heating device and the output end of the inverter. Referring to the internal circuit diagram of the battery pack shown in Figure 7, the battery pack may include a cell group 71, a second controller 72 (shown as a BMS controller 72 in the figure), a first switch S4, a second switch S5, a third switch S6 and a heating device 73. When the second controller 72 performs heating preparation, it can control the first switch S4 and the second switch S5 to be disconnected and the third switch S6 to be closed, so that the positive and negative poles of the battery pack are connected to the output end of the inverter, so that the inverter uses the energy supply end to heat the heating device 73.

[0102] It should be noted that the batteries in the embodiments of the present application may be lithium batteries, sodium batteries, etc., which are batteries whose normal use may be affected by low temperatures.

[0103] The battery heating method provided in the embodiment of the present application is applied to the second controller of the battery, and the battery and the second controller are arranged in the battery pack, and the battery pack is also provided with a heating device; the battery heating method includes: obtaining the battery cell temperature, generating a battery heating request according to the battery cell temperature; sending the battery heating request to the first controller of the inverter, so that the first controller generates a heating permission instruction when the energy information and management information of the energy supply end of the inverter meet the preset heating conditions; when the heating permission instruction is received, an electrical connection is established between the heating device and the output end of the inverter, and a heating preparation completion signal is sent to the first controller, so that the first controller controls the inverter to use the energy supply end to power the heating device. The embodiment of the present application can heat the battery in real time, avoid the battery from operating under low temperature conditions, ensure the battery's charging and discharging needs, save photovoltaic energy, and extend the battery's service life.

[0104] In a possible implementation, generating a battery heating request according to the battery cell temperature may be performed according to the following steps: when the battery cell temperature is lower than a second temperature threshold, generating a battery heating request.

[0105] In this step, the second temperature threshold can be determined according to actual needs, and this embodiment of the present application does not specifically limit this. In a possible implementation, for example, the second temperature threshold can be set to any temperature within the range of -5 degrees Celsius to -15 degrees Celsius.

[0106] In a possible embodiment, the following steps can also be performed: when the battery cell temperature is lower than a first temperature threshold and higher than a second temperature threshold, a self-heating request is generated; the self-heating request is sent to the first controller, so that the first controller generates an instruction to allow self-heating based on the self-heating request; the instruction to allow self-heating is received, and an electrical connection is established between the battery and the heating device based on the self-heating instruction, and the battery is controlled to supply power to the heating device to heat the battery.

[0107] In this step, the first temperature threshold and the second temperature threshold can be set according to actual needs and are not specifically limited in the embodiment of the present application. The first temperature is preset to be higher than the second temperature threshold. For example, the first temperature can be preset to any temperature within the range of 0 degrees Celsius to 10 degrees Celsius, and the second temperature threshold can be set to any temperature within the range of -5 degrees Celsius to -15 degrees Celsius.

[0108] When the battery cell temperature is lower than the first temperature threshold and higher than the second temperature threshold, a self-heating request is generated and sent to the first controller, so that the first controller determines whether to allow the battery to self-heat based on the self-heating request. After receiving the self-heating permission instruction from the first controller, the self-heating process is performed, thereby realizing the user's control over the power supply used by the heating device.

[0109] In this step, referring to the schematic diagram of the internal circuit of the battery shown in FIG7 , the battery may include a cell pack 71, a second controller 72 (shown as a BMS controller 72), a first switch S4, a second switch S5, a third switch S6, and a heating device 73. When the second controller 72 controls the battery to supply power to the heating device 73, it may control the first switch S4, the second switch S5, and the third switch S6 to be closed, thereby using the battery as a power source to heat the heating device 73.

[0110] It should be noted that the method may further include: when the battery cell temperature is higher than the first temperature threshold, the second controller generates a heating end request, and sends the heating end request to the first controller to stop the inverter from heating the heating device.

[0111] Based on the above-mentioned battery heating method provided in the embodiment of the present application, the embodiment of the present application also provides a battery heating device, including a first converter, a second converter, an inverter, a relay and a first controller; the first port of the first converter is electrically connected to the photovoltaic panel, the second port of the first converter is electrically connected to the first port of the inverter, the second port of the inverter is electrically connected to the grid through the relay, the first port of the inverter is electrically connected to the second port of the second converter, and the first port of the second converter is electrically connected to the battery; the first controller is used to heat the battery according to the following steps, the battery is arranged in a battery pack, and the battery pack is also provided with a heating device: when receiving a battery heating request, obtaining energy information and management information from the energy supply end of the inverter; if the energy information and management information meet the preset heating conditions, generating a heating permission instruction, and sending the heating permission instruction to the second controller of the battery, so that the second controller establishes an electrical connection between the heating device and the output end of the inverter, and sends a heating preparation completion signal to the first controller; when receiving the heating preparation completion signal, controlling the inverter to use the energy supply end to power the heating device to heat the battery.

[0112] It should be noted that, in this embodiment, the battery heating device refers to a device corresponding to the above-mentioned battery heating method, and does not refer to a heating device in a battery pack.

[0113] In the embodiments of the present application, a port refers to a physical connection point on a device or apparatus, which is used to connect cables, plugs, sockets, etc. to achieve actual physical connection and data transmission. A port can be an input port, an output port, or a bidirectional port, depending on its function and purpose. Different ports set on the same device or apparatus are referred to as a first port or a second port to distinguish the ports. For example, a first converter includes a first port and a second port, and an inverter includes a first port and a second port.

[0114] Referring to FIG8 , the first converter DC / DC1, the second converter DC / DC2, and the inverter DC / AC are shown. The PCS controller 81 in the figure is the first controller, and the relay includes S L and S N .

[0115] FIG9 shows the specific structures of DC / DC1 and DC / DC2, where DC / DC1 includes a first capacitor C1, a first inductor L1, a seventh switch S7, and a diode D1; DC / DC2 includes a second capacitor C2, an eighth switch S8, a ninth switch S9, and a second inductor L2.

[0116] The embodiment of the present application can heat the battery in real time to prevent the battery from operating under low temperature conditions, ensure the battery's charging and discharging needs, save photovoltaic energy, and extend the battery's service life.

[0117] The first controller may also be used to heat the battery according to various implementations corresponding to the battery heating method of the first controller applied to the inverter.

[0118] In one possible embodiment, when the inverter is in grid-connected mode, the energy supply end includes a photovoltaic panel and a power grid; obtaining management information of the energy supply end of the inverter includes: obtaining grid-connected power information of the photovoltaic panel and the power grid, battery AC power conversion efficiency information, and battery heating power information, and using the grid-connected power information, battery AC power conversion efficiency information, and battery heating power information as management information; if the energy information and the management information meet the preset heating conditions, including: if the product of the grid-connected power information and the battery AC power conversion efficiency information is greater than the battery heating power information, then determining that the energy information and the management information meet the preset heating conditions; controlling the inverter to use the energy supply end to power the heating device includes: controlling the inverter to use the photovoltaic panel to power the heating device.

[0119] In one possible embodiment, when the inverter is in grid-connected mode, the energy supply end includes the power grid; obtaining management information of the energy supply end of the inverter includes: obtaining power supply management information of the power grid, and using the power supply management information as management information; if the energy information and management information meet the preset heating conditions, including: determining the target heating time period according to the battery heating request, and determining the power supply time period and heating indication information according to the power supply management information; if the target heating time period is within the power supply time period, and the heating indication information is used to indicate that heating is allowed, then determining that the energy information and management information meet the preset heating conditions; controlling the inverter to use the energy supply end to power the heating device includes: controlling the inverter to use the power grid to power the heating device.

[0120] In one possible embodiment, when the inverter is in off-grid mode, the energy supply end includes a photovoltaic panel, and energy information of the energy supply end of the inverter is obtained, including: obtaining the voltage value of the photovoltaic panel, and using the voltage value of the photovoltaic panel as the energy information; if the energy information and management information meet the preset heating conditions, including: if the voltage value of the photovoltaic panel is greater than the preset voltage threshold, then determining that the energy information and management information meet the preset heating conditions; controlling the inverter to use the energy supply end to power the heating device, including: controlling the inverter to use the photovoltaic panel to power the heating device.

[0121] In one possible embodiment, controlling the inverter to utilize the energy supply end to power the heating device includes: obtaining the resistance value of the heating device and the target battery heating power value; calculating the target voltage value based on the resistance value and the target battery heating power value; and controlling the inverter to utilize the energy supply end to power the heating device according to the target voltage value.

[0122] In one possible embodiment, the battery heating method further includes: upon receiving a self-heating request, disconnecting the electrical connection between the output end of the inverter and the heating device, and sending a self-heating permission instruction to the second controller, so that the second controller establishes an electrical connection between the battery and the heating device according to the self-heating instruction, and controls the battery to supply power to the heating device to heat the battery.

[0123] In one possible implementation, the battery heating request is generated by the second controller when the battery cell temperature is lower than a second temperature threshold; the second controller is further configured to generate a self-heating request when the battery cell temperature is lower than the first temperature threshold and higher than the second temperature threshold.

[0124] The present application provides a battery heating control circuit structure, including: a heating device, a first switch group, a second switch group and a controller, wherein the controller is connected to the first switch group, and is also connected to the second switch group, the heating device is connected to the first switch group, and is also connected to the second switch group, and the controller controls the heating device to be electrically connected to the battery (or battery pack) or to an external power supply through the first switch group and the second switch group.

[0125] Based on the above-mentioned battery heating method provided in the embodiment of the present application, the embodiment of the present application also provides a battery pack, including a battery and a heating control circuit structure. The heating control circuit structure includes a heating device, a first switch group, a second switch group, a relay, and a second controller of the battery. The heating device is electrically connected to the battery through the first switch group, and the heating device is electrically connected to the interface of the battery pack through the second switch group and the relay; the second controller is used to heat the battery according to the following steps: obtaining the battery cell temperature and generating a battery heating request based on the battery cell temperature; sending the battery heating request to the first controller of the inverter, so that the first controller generates a heating permission instruction when the energy information and management information of the energy supply end of the inverter meet the preset heating conditions; upon receiving the heating permission instruction, establishing an electrical connection between the heating device and the output end of the inverter, and sending a heating preparation completion signal to the first controller, so that the first controller controls the inverter to use the energy supply end to power the heating device.

[0126] In an embodiment of the present application, FIG7 illustrates a possible implementation of a battery pack. The first port of the heating device is electrically connected to the first port of the battery via a third switch and the first switch. The second port of the heating device is electrically connected to the second port of the battery via the second switch. The first port of the heating device is electrically connected to the first interface of the battery pack via a third switch and a relay. The second port of the heating device is electrically connected to the second interface of the battery pack via a relay. In FIG7 , the cell group represents the battery. The first switch S4, the second switch S5, and the third switch S6 constitute the first switch group. The third switch S6 constitutes the second switch group. Relays are not shown in the figure. The "+" and "-" represent the interfaces of the battery pack, which are used to electrically connect to the output of the inverter.

[0127] Refer to Figure 11, which shows another possible implementation of the battery pack. In Figure 11, the lithium battery module represents the battery, the heating control relay KM3 and the total positive control relay KM1 constitute the first switch group, the total negative control relay KM2 and the total positive control relay KM1 constitute the second switch group, and the circuit breaker AK is connected to the interface of the battery pack, wherein "BAT+" and "BAT-" represent the interface of the battery pack.

[0128] The embodiment of the present application can heat the battery in real time to prevent the battery from operating under low temperature conditions, ensure the battery's charging and discharging needs, save photovoltaic energy, and extend the battery's service life.

[0129] The second controller may also be used to heat the battery according to various implementations corresponding to the battery heating method of the second controller applied to the battery.

[0130] In a possible implementation, generating a battery heating request according to the battery cell temperature includes: generating a battery heating request when the battery cell temperature is lower than a second temperature threshold.

[0131] In a possible embodiment, the above-mentioned battery heating method also includes: generating a self-heating request when the battery cell temperature is lower than a first temperature threshold and higher than a second temperature threshold; sending the self-heating request to the first controller, so that the first controller generates an instruction to allow self-heating according to the self-heating request; receiving the instruction to allow self-heating, establishing an electrical connection between the battery and the heating device according to the self-heating instruction, and controlling the battery to supply power to the heating device to heat the battery.

[0132] An embodiment of the present application further provides a battery heating system, comprising the above-mentioned inverter and the above-mentioned battery pack; a first controller is communicatively connected with a second controller.

[0133] In an embodiment of the present application, referring to the wiring diagram of the hybrid energy storage system shown in FIG6 , FIG6 shows a possible wiring situation of a photovoltaic panel 61 , a power grid 62 , an inverter 63 and a battery pack 64 .

[0134] An embodiment of the present application further provides an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor. The memory stores a computer program executable by the at least one processor, wherein the computer program, when executed by the at least one processor, causes the electronic device to perform the method of the embodiment of the present application.

[0135] An embodiment of the present application further provides a non-transitory machine-readable medium storing a computer program, wherein the computer program, when executed by a processor of a computer, is used to cause the computer to execute the method of the embodiment of the present application.

[0136] An embodiment of the present application further provides a computer program product, including a computer program, wherein the computer program, when executed by a processor of a computer, is used to cause the computer to execute the method of the embodiment of the present application.

[0137] With reference to Figure 4, the structural block diagram of the electronic device that can be used as the server or client of the embodiment of the present application will now be described, which is an example of the hardware device that can be applied to various aspects of the present application. The electronic device is intended to represent various forms of digital electronic computer equipment, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present application described and / or required herein.

[0138] As shown in Figure 4, the electronic device includes a computing unit 401, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 402 or a computer program loaded from a storage unit 408 into a random access memory (RAM) 403. In RAM 403, various programs and data required for the operation of the electronic device can also be stored. The computing unit 401, ROM 402, and RAM 403 are connected to each other via a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0139] Multiple components within the electronic device are connected to the I / O interface 405, including an input unit 406, an output unit 407, a storage unit 408, and a communication unit 409. The input unit 406 can be any type of device capable of inputting information into the electronic device. The input unit 406 can receive input numeric or character information and generate key signal inputs related to user settings and / or function control of the electronic device. The output unit 407 can be any type of device capable of presenting information and can include, but is not limited to, a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 408 can include, but is not limited to, a magnetic disk or an optical disk. The communication unit 409 allows the electronic device to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks, and can include, but is not limited to, a modem, a network card, an infrared communication device, a wireless communication transceiver, and / or a chipset, such as a Bluetooth device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0140] The computing unit 401 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 401 include, but are not limited to, a CPU, a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units for running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 401 performs the various methods and processes described above. For example, in some embodiments, the method embodiments of the present application may be implemented as a computer program, which is tangibly contained in a machine-readable medium, such as a storage unit 408. In some embodiments, part or all of the computer program may be loaded and / or installed on an electronic device via ROM 402 and / or communication unit 409. In some embodiments, the computing unit 401 may be configured to perform the above-described method in any other appropriate manner (e.g., by means of firmware).

[0141] The computer programs for implementing the methods of the embodiments of the present application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor or controller, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program can be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0142] In the context of the present application embodiment, machine-readable medium can be a tangible medium that can contain or store a program for use by an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. Machine-readable signal medium can include but is not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium can include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0143] Furthermore, with the development of the battery industry, the application scenarios for energy storage batteries are expanding. In common applications, energy storage batteries are primarily installed outdoors alongside photovoltaic energy storage inverters. However, energy storage batteries are generally unable to charge or discharge at low temperatures, significantly impacting their application in cold regions and the utilization rate of photovoltaic energy storage in winter. Existing energy storage batteries primarily rely on the cell's inherent low-temperature resistance, enabling low-current discharge between 0 and -20°C, but are still unable to charge. This results in an inability to store energy when the weather is too cold but photovoltaic energy is sufficient, resulting in a waste of resources.

[0144] Another object of the present application is to provide a battery pack heating control circuit, battery pack and energy storage system, which can at least use the battery pack or external power supply to power the heating device, thereby increasing the ambient temperature of the battery pack and ensuring the normal use of the battery pack; and use the collected temperature value to control the heating temperature of the battery pack heating control circuit to improve the safety of heating.

[0145] In order to achieve the above-mentioned purpose, the present application also provides a battery pack heating control circuit structure, including: a heating device, a first switch group, a second switch group and a controller, the controller is connected to the first switch group, and the controller is also connected to the second switch group, the heating device is connected to the first switch group, and the heating device is also connected to the second switch group, and the controller controls the heating device to be electrically connected to the battery pack or to an external power supply through the first switch group and the second switch group.

[0146] Referring to the schematic structural diagram of the battery pack heating control circuit shown in FIG12 , the battery pack heating control circuit is described below.

[0147] The battery pack heating control circuit includes: a first external port 101, a second external port 102, a third external port 103, a fourth external port 104, a heating device 105, a first switch group 106, a second switch group 107 and a controller 110; the controller 110 is electrically connected to the first switch group 106 and the second switch group 107 respectively, the first switch group 106 is electrically connected to the heating device 105, the third external port 103 and the first external port 101 respectively, and the second switch group 107 is electrically connected to the heating device 105, the fourth external port 104 and the second external port 102 respectively, so as to use the first switch group 106 and the second switch group 107 to control the power supply status between the first external port 101, the second external port 102 and the heating device 105, and to control the power supply status between the third external port 103, the fourth external port 104 and the heating device 105.

[0148] Optionally, as another embodiment, the battery pack heating control circuit further includes a first temperature sampling circuit 108 and a second temperature sampling circuit 109, and the controller 110 is further electrically connected to the second temperature sampling circuit and the first temperature sampling circuit, respectively, so as to use the second temperature sampling circuit 109 to collect the temperature value of the battery pack, and to use the first temperature sampling circuit 108 to collect the temperature value of the heating device 105.

[0149] Optionally, as another embodiment, the controller 110 may also execute the battery heating method described in the embodiment of FIG2 . It should be understood that the controller 110 may be the second controller in the embodiment of FIG2 .

[0150] The present application can utilize a battery pack or an external power supply to power the heating device 105 to realize the switching of the heating power supply; and utilize the collected temperature value to control the heating temperature of the battery pack heating control circuit to improve the safety of heating.

[0151] In the embodiment of the present application, the models of the first external port 101, the second external port 102, the third external port 103, and the fourth external port 104 can be selected based on actual needs. For example, the first external port 101 and the second external port 102 can be selected to be compatible with a battery pack for electrical connection to the battery pack to be heated; the third connection port 103 and the fourth connection port 104 can be selected to be compatible with an inverter or other energy storage device for electrical connection to the inverter or other energy storage device.

[0152] The heating device can adopt a heating film, a heating plate or other structures. Preferably, the heating film can be a polyimide PI heating film, a silicone film heating film, or a PTC self-limiting temperature heating film. The heating device can be set near the battery pack to be heated. The controller 110 controls the first switch group 106 and the second switch group 107 so that the power connected to the first external port 101 and the second external port 102 supplies power to the heating device 105 or the power connected to the third external port 103 and the fourth external port 104 supplies power to the heating device 105. After the heating device 105 is powered on, it generates heat to supply power to the battery pack to be heated. For example, the distance between the heating device 105 and the battery pack to be heated can be less than a specified distance value, thereby improving the heating efficiency of the battery pack by the heating device 105.

[0153] To prevent overheating, the controller 110 is electrically connected to the second temperature sampling circuit 109 and the first temperature sampling circuit 108, respectively, so that the second temperature sampling circuit 109 can collect the temperature of the battery pack, and the first temperature sampling circuit 108 can collect the temperature of the heating device 105. Based on the temperature values ​​of the battery pack and the heating device 105, the controller 110 generates a control instruction. This control instruction can control the first switch group 106 and the second switch group 107 to open, thereby stopping the heating device 105 from heating, achieving control over the heating temperature and improving heating safety.

[0154] The controller 110 is electrically connected to the first switch group 106 and the second switch group 107, respectively. The first switch group 106 is electrically connected to the heating device 105, the third external port 103, and the first external port 101, respectively. The second switch group 107 is electrically connected to the heating device 105, the fourth external port 104, and the second external port 102, respectively. The first switch group 106 may include one or more switches, and the second switch group 107 may include one or more switches. The controller 110 can control the state of each switch in the first switch group 106 and the second switch group 107 to be closed or open, thereby controlling the power supply state between the first external port 101, the second external port 102 and the heating device 105, and the power supply state between the third external port 103, the fourth external port 104 and the heating device 105 using the first switch group 106 and the second switch group 107. When the power supply between the first external port 101, the second external port 102 and the heating device 105 is in a flow state, the power supply electrically connected to the first external port 101 and the second external port 102 can be used to power the heating device 105; when the power supply between the third external port 103, the fourth external port 104 and the heating device 105 is in a flow state, the power supply electrically connected to the third external port 103 and the fourth external port 104 can be used to power the heating device 105, thereby realizing powering the heating device 105 with different power supplies and realizing free selection and switching of power supply sources.

[0155] In the present application, the battery pack heating control circuit includes: a first external port 101, a second external port 102, a third external port 103, a fourth external port 104, a heating device 105, a first switch group 106, a second switch group 107, a first temperature sampling circuit 108, a second temperature sampling circuit 109 and a controller 110; the controller 110 is electrically connected to the second temperature sampling circuit 109 and the first temperature sampling circuit 108 respectively, so as to use the second temperature sampling circuit 109 to collect the temperature value of the battery pack and use the first temperature sampling circuit 108 to collect the temperature value of the heating device; the controller 110 is electrically connected to the second temperature sampling circuit 109 and the first temperature sampling circuit 108 respectively, so as to use the second temperature sampling circuit 109 to collect the temperature value of the battery pack and use the first temperature sampling circuit 108 to collect the temperature value of the heating device; 0 is electrically connected to the first switch group 106 and the second switch group 107, respectively. The first switch group 106 is electrically connected to the heating device 105, the third external port 103, and the first external port 101, respectively. The second switch group 107 is electrically connected to the heating device 105, the fourth external port 104, and the second external port 102, respectively. The first switch group 106 and the second switch group 107 are used to control the power supply status between the first external port 101, the second external port 102 and the heating device 105, and to control the power supply status between the third external port 103, the fourth external port 104 and the heating device 105. The controller 110 of the present application can use the first switch group 106 and the second switch group 107 to control the power-on status between the first external port 101, the second external port 102 and the heating device 105, and control the power-on status between the third external port 103, the fourth external port 104 and the heating device 105, and the third external port 103 and the fourth external port 104 can be electrically connected to the battery pack, and the first external port 101 and the second external port 102 can be electrically connected to other power sources, so that the battery pack or the external power supply can be used to power the heating device 105, thereby realizing the switching of the heating power supply; in addition, based on the first temperature sampling circuit 108 collecting the temperature value of the heating device, and using the second temperature sampling circuit 109 to collect the temperature value of the battery pack, the controller 110 uses the collected temperature value to control the heating temperature of the battery pack heating control circuit, thereby improving the safety of heating.

[0156] In one possible embodiment, as shown in Figures 12 and 14, the first switch group 106 includes a first switch S1 and a third switch S3; the first port of the first switch S1 is electrically connected to the third external port 103, the second port of the first switch S1 is electrically connected to the first port of the third switch S3 and the first external port 101 respectively, and the second port of the third switch S3 is electrically connected to the heating device 105.

[0157] In an embodiment of the present application, referring to the first schematic diagram of the internal structure of the first switch group 106 and the second switch group 107 shown in Figure 14, the first switch group 106 includes a first switch S1 and a third switch S3. The controller 110 can control the working status of the first switch S1 and the third switch S3, as well as the working status of the second switch group 107, thereby connecting the heating device 105 to a designated power supply.

[0158] In a possible implementation, the second switch group includes a second switch S2 ; a first port of the second switch S2 is electrically connected to the fourth external port 104 , and a second port of the second switch S2 is electrically connected to the second port of the heating device 105 and the second external port 102 .

[0159] Referring to Figure 14 , the battery pack includes a battery pack heating control circuit 1410 and a battery cell group 1420. In the embodiment of the present application, referring to the first schematic diagram of the internal structure of the first switch group 106 and the second switch group 107 shown in Figure 14 , the second switch group 107 includes a second switch S2. The controller 110 connects the heating device 105 to a designated power supply by controlling the operating states of the first switch S1, the second switch S2, and the third switch S3.

[0160] In a possible implementation, the second switch group 107 includes a second switch S2 ; a first port of the second switch S2 is electrically connected to the fourth external port 104 and the second port of the heating device 105 , respectively; and a second port of the second switch S2 is electrically connected to the second external port 102 .

[0161] Referring to Figure 15, the battery pack includes a battery pack heating control circuit 1510 and a battery cell group 1520. In the embodiment of the present application, referring to the second schematic diagram of the internal structure of the first switch group 106 and the second switch group 107 shown in Figure 15, the second switch group 107 includes a second switch S2, and the controller 110 connects the heating device 105 to the designated power supply by controlling the working states of the first switch S1, the second switch S2 and the third switch S3. The second switch S2 is set between the second end of the heating device 105 and the second external port 102, so that the connection state of the heating device 105 and the battery cell group (or battery pack) can be controlled by the first switch S1 and the third switch S3, and the connection state of the heating device 105 and the external power supply can be controlled by the third switch S3 and the second switch S2. When any power supply is used, dual control can be performed through the two switches to avoid the situation where the continuous heating caused by the adhesion of the switches causes thermal runaway of the battery cell.

[0162] In a possible embodiment, the battery pack includes a plurality of battery cells; the heating device includes a plurality of heating films; and one or more heated films are respectively provided on the surface of one or more battery cells.

[0163] In an embodiment of the present application, one or more heating films are respectively provided on the surface of one or more battery cells, and multiple battery cells in a battery pack provided with multiple heating films are heated to ensure uniform and efficient heating.

[0164] In a possible implementation, the first temperature sampling circuit 108 includes one or more NTC (Negative Temperature Coefficient) thermistors, and the one or more NTC thermistors are disposed on the surface of the heating device 105 .

[0165] In the embodiment of the present application, the NTC thermistor is a thermally sensitive ceramic component made of transition metal oxide as the main raw material and using electronic ceramic technology. Its resistance value decreases with increasing temperature. This characteristic can be used as a temperature measurement, temperature compensation and temperature control component.

[0166] Preferably, a plurality of NTC thermistors can be dispersed and evenly arranged on the surface of the heating device 105. For example, a heating temperature sampling component is provided on the heating film to serve as a reference for controlling the temperature of the heating film.

[0167] In a possible implementation, the second temperature sampling circuit 109 includes one or more NTC thermistors, and the one or more NTC thermistors are disposed between the battery cells of the battery pack.

[0168] In an embodiment of the present application, multiple NTC thermistors can be dispersedly arranged between the cells of the battery pack. Referring to FIG16 , a schematic diagram of the arrangement of the NTC thermistors in the battery pack is shown, which includes battery pack A (Pack A) and battery pack B (Pack B). Battery pack A includes a heating film, batteries (Bat01-Bat16) and NTC thermistors (NTC1-NTC3), and battery pack B includes a heating film and batteries (Bat17-Bat32) and NTC thermistors (NTC4-NTC6). The figure shows the arrangement of the NTC thermistors at intervals of multiple batteries. The NTC thermistors are not limited to the arrangement shown in the figure, and the number of uses and the layout position can be adjusted according to the actual thermal simulation results.

[0169] In a possible implementation, the battery pack heating control circuit further includes a circuit breaker; the first switch group 106 is electrically connected to the first external port 101 through the circuit breaker, and the second switch group 107 is electrically connected to the second external port 102 through the circuit breaker.

[0170] In the embodiment of the present application, a circuit breaker is used to achieve the effect of short circuit protection to ensure the safety of circuit operation. The model of the circuit breaker can be selected according to actual needs and is not specifically limited in this application.

[0171] The following describes the battery pack heating control circuit using a specific embodiment. Referring to the heating control circuit diagram shown in FIG13 , in a specific implementation, the battery pack heating control circuit may include a circuit breaker AK, a total positive control relay KM1, a total negative control relay KM2, a heating control relay KM3, a controller 110, a heating film 131, a first temperature sampling circuit 108, and a second temperature sampling circuit 109.

[0172] In an embodiment of the present application, the battery pack heating control circuit includes a circuit breaker AK (short-circuit protection), a total positive control relay KM1, a total negative control relay KM2 connected in series on the main circuit of the lithium battery, a heating control relay KM3 connected in parallel on the lithium battery circuit, and a heating film 131 installed on the battery module 130, as well as a partial temperature sampling component of the battery module (the second temperature sampling circuit 109) and a partial temperature sampling component of the heating film (the first temperature sampling circuit 108) on the detection circuit.

[0173] The heating function of the energy storage lithium battery pack in the embodiment of the present application is achieved by designing the lithium battery module 130 within the battery pack with a heating film 131 attached to the front or side of each lithium battery cell within the module. When the heating film 131 receives energy, it emits heat to continuously heat the lithium battery cell, thereby raising the temperature of the lithium battery cell to above 0°C. Temperature sampling components are also provided on the lithium battery cells within the module to implement lithium battery temperature sampling to prevent overheating caused by self-heating during charging and discharging and continuous heating by the heating film 131.

[0174] In this embodiment of the present application, the controller 110 controls the closing or opening of the main positive control relay KM1, the main negative control relay KM2, and the heating relay KM3 to respectively realize that the photovoltaic energy storage inverter 140 or the household energy storage lithium battery pack provides the required energy for heating, and achieves dual protection backup, greatly avoiding the occurrence of abnormal situations and improving safety performance. The heating control circuit of the lithium battery pack 130 can control the heating process according to the following scenarios:

[0175] 1. When the photovoltaic energy storage inverter 140 provides power to control the heating film 131 to heat the household energy storage lithium battery module, the total negative control relay KM2 and the heating control relay KM3 are closed, so that the heating film 131 uses the power provided by the photovoltaic energy storage inverter 140 to perform heating work, heating the lithium battery to a temperature environment suitable for operation;

[0176] Preferably, in order to extend the service life of the heating relay KM3, it is possible to consider first closing the heating control relay KM3 with a low load capacity. At this time, the heating circuit is not formed, and the heating relay KM3 is closed without load. Then, the total negative control relay KM2 with a high load capacity is closed. At this time, the heating circuit is formed by the total negative control relay KM2 closing with load, thereby greatly extending the service life of the heating control relay KM3 with a low load capacity.

[0177] 2. When the household energy storage lithium battery pack provides power to control the heating film 131 to heat the lithium battery module 130, the total positive control relay KM1 and the heating control relay KM3 are closed, so that the heating film 131 uses the power provided by the household energy storage lithium battery pack to heat the lithium battery to a temperature environment suitable for operation;

[0178] Preferably, in order to extend the service life of the heating relay KM3, it is possible to consider first closing the heating control relay KM3 with low load capacity. At this time, the heating circuit is not formed, and the heating relay KM3 is closed without load. Then, the total positive control relay KM1 with high load capacity is closed. At this time, the heating circuit is formed by the total positive control relay KM1 closed with load, thereby greatly extending the service life of the heating control relay KM3 with low load capacity.

[0179] 3. When the photovoltaic energy storage inverter 140 is charging the household energy storage lithium battery pack, the photovoltaic energy storage inverter 140 can provide power to control the heating film 131 to heat the lithium battery module 130. The total positive control relay KM1, the total negative control relay KM2, and the heating control relay KM3 are closed. The photovoltaic energy storage inverter 140 provides the charging energy for the household energy storage lithium battery pack and the energy required to heat the heating film 131. The surplus photovoltaic energy is fully utilized, and the heating film 131 uses the power provided by the photovoltaic energy storage inverter 140 to heat the lithium battery to a temperature environment suitable for operation.

[0180] Preferably, in order to extend the service life of the heating relay KM3, it is possible to consider first closing the heating control relay KM3 with a low load capacity. At this time, the heating circuit is not formed, and the heating relay KM3 is closed without load. Then, the total positive control relay KM1 and the total negative control relay KM2 with high load capacity are closed. At this time, the heating circuit is formed by the total positive control relay KM1 or the total negative control relay KM2 being closed with load, thereby greatly extending the service life of the heating control relay KM3 with a low load capacity.

[0181] 4. When the photovoltaic energy storage inverter 140 discharges the household energy storage lithium battery pack, the household energy storage lithium battery pack can provide power to control the heating film 131 to heat the lithium battery module 130. The total positive control relay KM1, the total negative control relay KM2, and the heating control relay KM3 are closed. The household energy storage lithium battery pack provides the load energy of the photovoltaic energy storage inverter 140 and the energy required for heating the heating film 131, so that the lithium battery can quickly raise its own temperature to a suitable working temperature environment;

[0182] 5. If the temperature value obtained by the temperature sampling component on the lithium battery module 130 is within the suitable operating temperature range, the total positive control relay KM1, the total negative control relay KM2 and the heating control relay KM3 are actively disconnected to disconnect the power supply circuit of the heating film 131 and stop the active heating function;

[0183] Preferably, in order to extend the service life of the heating relay KM3, it can be considered to first disconnect the total positive control relay KM1 and the total negative control relay KM2 with higher load capacity. At this time, the total positive control relay KM1 and the total negative control relay KM2 are disconnected with load, and the heating circuit is disconnected with load by the total positive control relay KM1 or the total negative control relay KM2. Then, the heating relay KM3 with lower load capacity is disconnected, thereby greatly extending the service life of the heating control relay KM3 with lower load capacity.

[0184] 6. When the temperature value obtained by the temperature sampling component set on the heating film 131 is higher than the warning threshold, or the temperature value obtained by the temperature sampling component on the lithium battery module 130 is higher than the warning threshold, the total positive control relay KM1, the total negative control relay KM2 and the heating relay KM3 should be disconnected in time to avoid abnormal temperature rise and thus cause thermal runaway of the lithium battery module 130, thereby playing an overheating protection function.

[0185] The present application relates to the heating function of household energy storage lithium battery packs, which improves the environmental adaptability of household energy storage battery packs, facilitates installation and use in cold areas, makes full use of photovoltaic energy in various environments to avoid waste, and ensures the continuous supply of energy to household loads in low temperature environments. The present application designs a heating film on the battery cell module, which can be controlled by the hardware circuit to realize that the household energy storage inverter provides heating energy or the battery's own power is used as the heating energy source, and realizes heating temperature control based on the temperature sampling set on the heating film and the temperature sampling set on the battery cell module, avoiding the situation where continuous overheating causes thermal runaway of the lithium battery, and realizing the dual backup of the main positive and main negative relays and the heating control relay, avoiding the situation where continuous heating caused by adhesion of the heating control relay causes thermal runaway of the battery cell; realizing the effect that the source of the power supply energy of the heating film can be controlled, the dual backup of the control circuit improves safety, and the dual backup of the sampling circuit improves safety.

[0186] In another aspect, embodiments of the present application further provide a battery pack comprising a battery pack and the aforementioned battery pack heating control circuit, wherein the heating control circuit is electrically connected to the battery pack via a third external port and a fourth external port. Therefore, the battery pack includes all the technical effects of the aforementioned battery pack heating control circuit. Since the technical effects of the battery pack heating control circuit have been described in detail above, they will not be repeated here.

[0187] In another aspect, embodiments of the present application further provide an energy storage system comprising an energy storage inverter and the aforementioned battery pack, the energy storage inverter being electrically connected to the battery pack via a first external port and a second external port. The battery pack incorporates all the technical effects of the aforementioned battery pack heating control circuit. Since the technical effects of the battery pack heating control circuit have been described in detail above, they will not be repeated here.

[0188] It should be noted that the term "including" and its variations used in the embodiments of the present application are open inclusions, that is, "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of the present application are illustrative and not restrictive. Those skilled in the art should understand that unless the context clearly indicates otherwise, it should be understood as "one or more".

[0189] The user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in the embodiments of this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0190] The various steps described in the method implementation schemes provided in the embodiments of the present application can be performed in different orders and / or in parallel. In addition, the method implementation schemes may include additional steps and / or omit the steps shown. The scope of protection of the present application is not limited in this respect.

[0191] The term "embodiment" in this specification refers to specific features, structures or characteristics described in conjunction with the embodiment that can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. The various embodiments in this specification are described in a related manner, and the same or similar parts between the various embodiments are referenced to each other. In particular, for the device, equipment, and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts are referred to the partial description of the method embodiment.

[0192] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0193] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0194] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of patent protection. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A battery heating method, characterized in that: A first controller applied to an inverter, wherein the battery is arranged in a battery pack, and a heating device is arranged in the battery pack; and the battery heating method comprises: receiving a battery heating request sent by a second controller of the battery, wherein the battery heating request is generated by the second controller when it is determined based on the acquired battery cell temperature that the battery needs to perform a heating operation and the battery does not meet a self-heating condition; In response to the battery heating request, obtaining at least one of energy information and management information of an energy supply end of the inverter; If at least one of the energy information and the management information meets the preset heating condition, generating a heating permission instruction; sending the heating permission instruction to the second controller of the battery so that the second controller establishes an electrical connection between the heating device and the output terminal of the inverter; The inverter is controlled to utilize the energy supply end to supply power to the heating device, so as to heat the battery.

2. The battery heating method according to claim 1, characterized in that: Also includes: receiving a self-heating request sent by the second controller, wherein the self-heating request is generated by the second controller when a cell temperature of the battery is higher than a second temperature threshold and lower than a first temperature threshold during a process in which the inverter heats the battery; Disconnect the electrical connection between the output end of the inverter and the heating device, and send a self-heating permission instruction to the second controller, so that the second controller establishes an electrical connection between the battery and the heating device according to the self-heating permission instruction, and controls the battery to supply power to the heating device to heat the battery.

3. The battery heating method according to claim 1 or 2, characterized in that: When the inverter is in grid-connected mode, the energy supply end includes a photovoltaic panel and a grid; Wherein, the acquiring at least one of the energy information and the management information of the energy supply end of the inverter comprises: Obtaining grid-connected power information of the photovoltaic panel and the grid, battery AC power conversion efficiency information, and battery heating power information, and using the grid-connected power information, the battery AC power conversion efficiency information, and the battery heating power information as management information; If at least one of the energy information and the management information satisfies a preset heating condition, generating a heating permission instruction includes: If the product of the grid-connected power information and the battery AC power conversion efficiency information is greater than the battery heating power information, generating the heating permission instruction; Wherein, controlling the inverter to use the energy supply end to power the heating device includes: The inverter is controlled to utilize the photovoltaic panel to power the heating device.

4. The battery heating method according to any one of claims 1 to 3, characterized in that: When the inverter is in grid-connected mode, the energy supply end includes a grid; Wherein, the acquiring at least one of the energy information and the management information of the energy supply end of the inverter comprises: Acquire power supply management information of the power grid, and use the power supply management information as management information; If at least one of the energy information and the management information satisfies a preset heating condition, generating a heating permission instruction includes: determining a target heating time period according to the battery heating request, and determining a power supply time period and heating instruction information according to the power supply management information; If the target heating time period is within the power supply time period, and the heating instruction information is used to indicate that heating is permitted, generating the heating permission instruction; Wherein, controlling the inverter to use the energy supply end to power the heating device includes: The inverter is controlled to utilize the power grid to supply power to the heating device.

5. The method according to any one of claims 1 to 4, characterized in that When the inverter is in off-grid mode, the energy supply end includes a photovoltaic panel, The acquiring at least one of the energy information and management information of the energy supply end of the inverter comprises: Acquiring a voltage value of the photovoltaic panel, and using the voltage value of the photovoltaic panel as energy information; If at least one of the energy information and the management information meets a preset heating condition, generating a heating permission instruction includes: If the voltage value of the photovoltaic panel is greater than a preset voltage threshold, the heating permission instruction is generated; Wherein, controlling the inverter to use the energy supply end to power the heating device includes: The inverter is controlled to utilize the photovoltaic panel to power the heating device.

6. The method according to any one of claims 1 to 5, characterized in that The step of controlling the inverter to supply power to the heating device using the energy supply end includes: Obtaining a resistance value of the heating device and a target battery heating power value; calculating a target voltage value based on the resistance value and the target battery heating power value; The inverter is controlled to utilize the energy supply end to supply power to the heating device according to the target voltage value.

7. The battery heating method according to any one of claims 1 to 6, characterized in that: Before controlling the inverter to use the energy supply end to power the heating device, the battery heating method further includes: Receive a heating preparation completion signal sent by the second controller.

8. A battery heating method, characterized in that: A second controller applied to a battery, wherein the battery and the second controller are arranged in a battery pack, and a heating device is arranged in the battery pack; the battery heating method comprises: Obtaining a cell temperature of the battery; generating a battery heating request when it is determined, according to the battery cell temperature of the battery, that the battery needs to perform a heating operation and the battery does not meet a self-heating condition; sending the battery heating request to a first controller of the inverter; receiving a heating permission instruction sent by the first controller; According to the heating permission instruction, an electrical connection is established between the heating device and the output end of the inverter so that the first controller controls the inverter to use the energy supply end to power the heating device to heat the battery, wherein the heating permission instruction is generated by the first controller when at least one item of the energy information and the management information meets the preset heating condition.

9. The method according to claim 8, characterized in that Also includes: During the process of the inverter heating the battery, determining that the cell temperature of the battery is higher than the second temperature threshold and lower than the first temperature threshold, generating a self-heating request, and sending it to the first controller; receiving a self-heating permission instruction sent by the first controller; establishing an electrical connection between the battery and the heating device according to the self-heating permission instruction; The battery is controlled to supply power to the heating device to heat the battery, wherein the instruction to allow self-heating is generated after the first controller disconnects the electrical connection between the output terminal of the inverter and the heating device according to the self-heating request.

10. The battery heating method according to claim 8 or 9, characterized in that: After establishing the electrical connection between the heating device and the output terminal of the inverter, the battery heating method further includes: A heating preparation completion signal is sent to the first controller.

11. A battery heating device, characterized in that: It includes a first converter, a second converter, an inverter, a relay and a first controller; the first port of the first converter is electrically connected to the photovoltaic panel, the second port of the first converter is electrically connected to the first port of the inverter, the second port of the inverter is electrically connected to the power grid through the relay, the first port of the inverter is electrically connected to the second port of the second converter, and the first port of the second converter is electrically connected to the battery; the first controller is used to execute the battery heating method as described in any one of claims 1 to 7.

12. A battery pack, characterized in that: The invention comprises a battery, a heating device, a first switch group, a second switch group, a relay and a second controller of the battery, wherein the heating device is electrically connected to the battery through the first switch group, and the heating device is electrically connected to the interface of the battery pack through the second switch group and the relay; the second controller is used to execute the battery heating method as described in any one of claims 8 to 10.

13. The battery pack according to claim 12, characterized in that: Also includes: a first external port, a second external port, a third external port, a fourth external port, a first temperature sampling circuit, and a second temperature sampling circuit, Wherein, the second controller is electrically connected to the second temperature sampling circuit and the first temperature sampling circuit respectively, so as to collect the temperature value of the battery pack by using the second temperature sampling circuit, and to collect the temperature value of the heating device by using the first temperature sampling circuit; The second controller is electrically connected to the first switch group and the second switch group, respectively; the first switch group is electrically connected to the heating device, the third external port, and the first external port, respectively; the second switch group is electrically connected to the heating device, the fourth external port, and the second external port, respectively, so as to utilize the first switch group and the second switch group to control the power-on state between the first external port, the second external port and the heating device, and to control the power-on state between the third external port, the fourth external port and the heating device.

14. A battery heating system, characterized in that: It comprises the battery heating device according to claim 11 and the battery pack according to claim 12 or 13; the first controller is communicatively connected with the second controller.

15. A non-transitory machine-readable medium storing computer instructions, characterized in that: The computer instructions are used to cause the computer to execute the battery heating method according to any one of claims 1 to 10.

16. A battery pack heating control circuit, characterized in that: include: A first external port, a second external port, a third external port, a fourth external port, a heating device, a first switch group, a second switch group, a first temperature sampling circuit, a second temperature sampling circuit and a controller; The controller is electrically connected to the second temperature sampling circuit and the first temperature sampling circuit respectively, so as to collect the temperature value of the battery pack by using the second temperature sampling circuit, and to collect the temperature value of the heating device by using the first temperature sampling circuit; The controller is electrically connected to the first switch group and the second switch group, respectively; the first switch group is electrically connected to the heating device, the third external port, and the first external port, respectively; the second switch group is electrically connected to the heating device, the fourth external port, and the second external port, respectively, so as to utilize the first switch group and the second switch group to control the power-on state between the first external port, the second external port and the heating device, and to control the power-on state between the third external port, the fourth external port and the heating device.

17. The battery pack heating control circuit according to claim 16, characterized in that: The first switch group includes a first switch and a third switch; The first port of the first switch is electrically connected to the third external port, the second port of the first switch is electrically connected to the first port of the third switch and the first external port respectively, and the second port of the third switch is electrically connected to the heating device.

18. The battery pack heating control circuit according to claim 17, characterized in that: The second switch group includes a second switch; The first port of the second switch is electrically connected to the fourth external port, and the second port of the second switch is electrically connected to the second port of the heating device and the second external port respectively.

19. The battery pack heating control circuit according to claim 17, characterized in that: The second switch group includes a second switch; The first port of the second switch is electrically connected to the fourth external port and the second port of the heating device respectively, and the second port of the second switch is electrically connected to the second external port.

20. The battery pack heating control circuit according to claim 16, characterized in that: The battery pack includes a plurality of battery cells; the heating device includes a plurality of heating films; and one or more heating films are respectively provided on the surface of one or more of the battery cells.

21. The battery pack heating control circuit according to claim 16, characterized in that: The first temperature sampling circuit includes one or more NTC thermistors, and the one or more NTC thermistors are arranged on the surface of the heating device.

22. The battery pack heating control circuit according to claim 16, characterized in that: The second temperature sampling circuit includes one or more NTC thermistors, and the one or more NTC thermistors are arranged between the battery cells of the battery pack.

23. The battery pack heating control circuit according to any one of claims 16 to 22, characterized in that: It also includes a circuit breaker; the first switch group is electrically connected to the first external port through the circuit breaker, and the second switch group is electrically connected to the second external port through the circuit breaker.

24. A battery pack, characterized in that: The invention comprises a battery pack and the battery pack heating control circuit according to any one of claims 16 to 23, wherein the battery pack heating control circuit is electrically connected to the battery pack through the third external connection port and the fourth external connection port.

25. An energy storage system, characterized in that: It includes an energy storage inverter and the battery pack as claimed in claim 24, wherein the energy storage inverter is electrically connected to the battery pack through the first external port and the second external port.

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