Battery circuit, battery charging method, battery and vehicle

Abstract

The invention provides a battery circuit, a battery charging method, a battery and a vehicle. The battery circuit comprises a charging loop, a discharging loop and a heating loop; the heating loop comprises a heating control switch; the charging loop, the discharging loop and the heating loop are connected in parallel; under the condition that the heating control switch is closed, the heating loop is conducted. According to the invention, the safety of the battery during charging can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery charging, and in particular to a battery circuit, a battery charging method, a battery and a vehicle. Background Art

[0002] In low temperature environments, the conductivity of the electrode materials (such as carbon negative electrodes) of lithium-ion batteries will decrease, and the ion migration rate of the electrolyte will also slow down, resulting in a slowdown in the electrochemical reaction rate inside the battery. At the same time, the activity of lithium metal decreases at low temperatures, causing lithium ions to precipitate at the negative electrode to form lithium metal. In extreme cases, if lithium-ion batteries are energy supply components in electric vehicles, lithium precipitation in the battery cells when charging at low temperatures may cause safety hazards such as battery overheating and fire, thereby threatening the safety of the vehicle and passengers.

[0003] In the related art, electric vehicles’ power battery systems are usually equipped with heating circuits, and the control of the heating circuits is closely related to their high-voltage power distribution schemes. The high-voltage power distribution schemes of power batteries usually adopt an architecture in which a fast-charging circuit and a discharge circuit are connected in series. Under this circuit architecture, the heating and charging processes of the battery system are performed simultaneously in the low-temperature stage. In this way, if the temperature of the battery system does not reach the temperature suitable for charging, charging the battery system will have the risk of lithium deposition during low-temperature charging, which reduces the safety of the battery when charging. Summary of the invention

[0004] Embodiments of the present application provide a battery circuit, a battery charging method, a battery, and a vehicle, which can improve the safety of battery charging.

[0005] The technical solution of the embodiment of the present application is implemented as follows:

[0006] An embodiment of the present application provides a battery circuit, the battery circuit comprising:

[0007] A charging circuit, a discharging circuit and a heating circuit; the heating circuit includes a heating control switch;

[0008] The charging circuit, the discharging circuit and the heating circuit are connected in parallel;

[0009] When the heating control switch is closed, the heating circuit is turned on.

[0010] In the above solution, the heating circuit includes a heating module;

[0011] The heating control switch is connected in series with the heating module;

[0012] When the heating control switch is closed, the heating module is started; when the heating control switch is opened, starting the heating module is prohibited.

[0013] In the above scheme, the heating circuit also includes a circuit controller;

[0014] When it is detected that the battery is in the charging mode and the temperature of the battery cell is less than or equal to the first preset temperature, the circuit controller controls the heating control switch in the heating circuit to close.

[0015] In the above solution, when it is detected that the battery is in charging mode and the temperature of the battery cell rises to a temperature greater than the first preset temperature, the circuit controller controls the charging circuit to be turned on.

[0016] In the above scheme, when the charging positive electrode relay is in a closed state, the circuit controller controls the charging positive electrode circuit in the charging circuit to be turned on;

[0017] When the negative charging electrode relay is in a closed state, the circuit controller controls the negative charging electrode circuit in the charging circuit to be turned on;

[0018] When both the charging positive electrode circuit and the charging negative electrode circuit are in the conducting state, the charging circuit is in the conducting state.

[0019] In the above solution, when it is detected that the battery is in charging mode and the temperature of the battery core rises to a temperature greater than the second preset temperature, the circuit controller controls to disconnect the heating control switch; when the heating control switch is disconnected, the heating circuit is not turned on;

[0020] The charging circuit is in a conducting state.

[0021] In the above scheme, the discharge circuit also includes a pre-charge resistor, a pre-charge relay and a discharge positive relay;

[0022] The pre-charging relay and the pre-charging resistor are connected in series;

[0023] The discharge positive relay is connected in parallel with a series circuit formed by the pre-charging relay and the pre-charging resistor;

[0024] When receiving a discharge instruction, the circuit controller controls the pre-charge relay and the discharge negative relay in the discharge circuit to close, and controls the discharge positive relay to open; when detecting that the discharge current is less than or equal to a preset current, the circuit controller controls the pre-charge relay to open, and controls the discharge positive relay to close;

[0025] When the pre-charging relay is in a closed state, conducting a series circuit formed with the pre-charging resistor;

[0026] When the discharge cathode relay is in a closed state, conducting the discharge cathode circuit in the discharge circuit;

[0027] When the discharge positive electrode relay is in a closed state, the discharge positive electrode circuit in the discharge circuit is turned on.

[0028] In the above solution, the first switch is in an off state, and the first switch is the remaining switch in the battery circuit except the heating control switch.

[0029] An embodiment of the present application provides a battery charging method, the method comprising:

[0030] When it is detected that the battery is in charging mode, the battery cell temperature is detected;

[0031] When the temperature of the battery cell is less than or equal to a first preset temperature, heating the battery cell of the battery;

[0032] When the temperature of the battery cell rises to a temperature greater than the first preset temperature, the battery cell is charged.

[0033] In the above solution, when the temperature of the battery cell is less than or equal to the first preset temperature, heating the battery cell of the battery includes:

[0034] When it is detected that the battery is in charging mode and the temperature of the battery cell is less than or equal to the first preset temperature, closing the heating control switch in the heating circuit;

[0035] When the heating control switch is in a closed state, the heating module in the heating circuit is started;

[0036] The heating module is used to heat the battery cell.

[0037] In the above solution, when the temperature of the battery cell rises to a temperature greater than the first preset temperature, charging the battery cell includes:

[0038] When it is detected that the battery is in charging mode and the temperature of the battery cell rises to a temperature greater than the first preset temperature, closing the positive charging relay and the negative charging relay in the charging circuit;

[0039] When the charging positive electrode relay and the charging negative electrode relay are both in a closed state, turning on the charging circuit;

[0040] The battery cell is charged by utilizing the charging circuit.

[0041] In the above solution, the heating of the battery cell further comprises:

[0042] Disconnecting the positive charging relay and / or the negative charging relay in the charging circuit;

[0043] When the charging positive relay and / or the charging negative relay are in the disconnected state, the charging circuit is not turned on;

[0044] When the charging circuit is not conducting, charging of the battery cell is prohibited.

[0045] In the above solution, charging the battery cell further includes:

[0046] heating the battery cell;

[0047] When the temperature of the battery cell rises to a temperature greater than a second preset temperature, the heating of the battery cell is stopped, and the charging of the battery cell continues.

[0048] In the above solution, stopping heating the battery cell includes:

[0049] Disconnect the heating control switch in the heating circuit;

[0050] When the heating control switch is in the off state, the heating module in the heating circuit is not started;

[0051] When the heating module is not started, the heating of the battery cell is stopped.

[0052] In the above solution, after charging the battery cell, the method further includes:

[0053] When receiving a discharge instruction, closing the pre-charge relay in the discharge circuit and the discharge negative relay in the discharge circuit, and disconnecting the discharge positive relay in the discharge circuit;

[0054] When the pre-charging relay and the discharge cathode relay are closed and it is detected that the discharge current in the discharge circuit is less than or equal to a preset current, the pre-charging relay is disconnected and the discharge cathode relay is closed;

[0055] When the pre-charging relay is in an open state and the discharge positive relay is in a closed state, the discharge circuit is in a conducting state;

[0056] When the discharge circuit is in a conducting state, the battery is discharged by using the discharge circuit.

[0057] An embodiment of the present application provides a computer-readable storage medium storing a computer program or computer-executable instructions for implementing the battery charging method provided in the embodiment of the present application when executed by a processor.

[0058] An embodiment of the present application provides a battery, and the battery includes the battery circuit described above.

[0059] An embodiment of the present application provides a vehicle, comprising the battery described above.

[0060] The embodiments of the present application have the following beneficial effects: the battery circuit includes a heating circuit, and the heating circuit, the charging circuit and the discharging circuit are all parallel circuits. The heating circuit also includes a heating control switch, and the heating circuit is controlled by the heating control switch to be turned on and off. The heating circuit and the charging circuit are also connected in parallel, so that decoupling control can be achieved between the charging circuit and the heating circuit. That is, when the battery cell temperature is insufficient, the heating control switch can be used to turn on the heating circuit to heat the battery cell. When the temperature of the battery cell rises to a level where there is no risk of lithium deposition, the charging circuit can be used to charge the battery cell, thereby avoiding the risk of lithium deposition when the battery is charged at low temperature, thereby improving the safety of the battery during charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 is a structural schematic diagram of a battery circuit provided in an embodiment of the present application;

[0062] Figure 2 is a schematic structural diagram of an exemplary battery circuit provided in an embodiment of the present application;

[0063] Figure 3 is a flow chart of a battery charging method provided in an embodiment of the present application;

[0064] Figure 4 This is a flow chart of an exemplary battery charging method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0066] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it can be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0067] In the embodiments of the present application, the term "module" or "unit" refers to a computer program or a part of a computer program with a predetermined function, and works together with other related parts to achieve a predetermined goal, and can be implemented in whole or in part by using software, hardware (such as processing circuits or memories) or a combination thereof. Similarly, a processor (or multiple processors or memories) can be used to implement one or more modules or units. In addition, each module or unit can be part of an overall module or unit that includes the function of the module or unit.

[0068] Unless otherwise defined, all technical and scientific terms used in the embodiments of the present application have the same meanings as those commonly understood by those skilled in the art. The terms used in the embodiments of the present application are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0069] The relevant data collection and processing in the embodiments of this application should be strictly in accordance with the requirements of relevant national laws and regulations when applied in examples, obtain the informed consent or separate consent of the personal information subject, and carry out subsequent data use and processing within the scope of authorization of laws and regulations and the personal information subject.

[0070] The present application embodiment provides a battery circuit, such as Figure 1 As shown; the battery circuit includes:

[0071] A charging circuit 11, a discharging circuit 12 and a heating circuit 13; the heating circuit 13 includes a heating control switch 131;

[0072] The charging circuit 11, the discharging circuit 12 and the heating circuit 13 are connected in parallel;

[0073] When the heating control switch 131 is closed, the heating circuit 13 is turned on.

[0074] A battery circuit provided in an embodiment of the present application is suitable for charging a lithium battery.

[0075] In the embodiments of the present application, Figure 1 As shown, the battery circuit further includes a battery cell 14 .

[0076] In the embodiment of the present application, the battery cell may be a lithium battery cell.

[0077] In the embodiment of the present application, if the battery is a lithium battery, the charging circuit is a circuit for providing electrical energy to the lithium battery, the discharging circuit is a circuit for outputting electrical energy from the lithium battery, and the heating circuit is a circuit for heating the battery cells of the lithium battery.

[0078] For example, if the lithium battery is an energy supply component in a car, the charging circuit is a circuit for charging the lithium battery using a vehicle charging pile, the discharging circuit is a circuit for the lithium battery to output electrical energy to the vehicle, and the heating circuit is a circuit for heating the lithium battery cell.

[0079] In Example 1, the heating circuit can heat the outer shell of the battery pack, thereby heating the battery pack. Specifically, when the heating control switch is closed, the heating circuit is turned on. When the heating circuit is turned on, the outer shell of the battery pack is heated by the heating circuit, and the battery is heated by heating the outer shell of the battery pack until the battery temperature rises to the highest temperature at which the lithium battery can be heated while charging.

[0080] In Example 2, the heating circuit can heat the bottom plate of the battery pack, thereby heating the battery. Specifically, when the heating control switch is closed, the heating circuit is turned on. When the heating circuit is turned on, the bottom plate of the battery pack is heated by the heating circuit, and the battery is heated by heating the bottom plate of the battery pack until the battery temperature rises to the highest temperature at which the lithium battery can be heated while charging.

[0081] In Example 3, the heating circuit can heat the bracket for fixing the battery cells inside the battery pack, thereby heating the battery. Specifically, when the heating control switch is closed, the heating circuit is turned on. When the heating circuit is turned on, the bracket for fixing the battery cells inside the battery pack is heated by the heating circuit, and the battery is heated by heating the bracket for fixing the battery cells inside the battery pack until the battery temperature rises to the highest temperature at which the lithium battery can be heated while being charged.

[0082] In Example 4, the heating circuit can heat the busbar and / or the conductive rail (the busbar and the conductive rail are used to connect the battery module to transmit electrical energy), thereby heating the battery. Specifically, when the heating control switch is closed, the heating circuit is turned on. When the heating circuit is turned on, the busbar and / or the conductive rail are heated by the heating circuit, and the battery is heated by heating the busbar and / or the conductive rail until the battery temperature rises to the highest temperature at which the lithium battery can be heated while charging.

[0083] In the embodiment of the present application, the circuit structure of the charging circuit can be determined according to actual conditions, and the embodiment of the present application does not limit this.

[0084] In the embodiment of the present application, the circuit structure of the discharge circuit can be determined according to actual conditions, and the embodiment of the present application does not limit this.

[0085] In the embodiment of the present application, the charging circuit and the discharging circuit are connected in parallel, the charging circuit and the heating circuit are connected in parallel, and the heating circuit and the discharging circuit are also connected in parallel.

[0086] It should be noted that the charging circuit is a fast charging circuit. Using the fast charging circuit to charge the battery cell can shorten the charging time of the battery cell.

[0087] In the embodiment of the present application, the heating control switch is a switch in the heating circuit. When the heating control switch is in a closed state, the heating circuit is conductive; when the heating control switch is in an open state, the heating circuit is also not conductive.

[0088] In the embodiment of the present application, the heating control switch can be a relay, the heating control switch can also be a diode, the heating control switch can also be other forms of switches. The specific heating control switch can be determined according to actual conditions, and the embodiment of the present application does not limit this.

[0089] Optionally, the heating control switch 131 is a heating control relay.

[0090] Optional, such as Figure 1 As shown, the heating circuit 13 includes a heating module 132;

[0091] The heating control switch 131 is connected in series with the heating module 132;

[0092] When the heating control switch 131 is closed, the heating module 132 is started; when the heating control switch 131 is opened, starting the heating module 132 is prohibited.

[0093] In the embodiment of the present application, when the heating module is started, the heating module heats the battery cell 14 , and when the heating module is not started (ie, the heating module is prohibited from starting), the heating module stops heating the battery cell 14 .

[0094] In the embodiment of the present application, the heating module can be a thermal resistor, a heating film (also called an electric heating film), a heat pipe or liquid heating, etc. The heating module can also be other electronic devices that can provide thermal energy. The specific heating module can be determined according to actual conditions, and the embodiment of the present application does not limit this.

[0095] Thermal resistors have the advantages of high measurement accuracy, stable performance, wide application range, small size, good mechanical properties, vibration and shock resistance, easy installation and long life. Specific:

[0096] High measurement accuracy: Platinum resistance thermometers have extremely high measurement accuracy and are widely used in situations that require high-precision temperature measurement.

[0097] In terms of stable performance: thermal resistors can maintain high measurement accuracy under various environmental conditions and show good stability.

[0098] Wide range of applications: Metal thermal resistors are suitable for temperature measurement in the range of -200 to 500°C, and are often used in temperature detection and control of household appliances and automobiles; the temperature measurement range of semiconductor thermistors is around -50 to 300°C, and they have the characteristics of accurate measurement, good stability and reliable performance.

[0099] Small size and good mechanical properties: There is no air gap inside the thermal resistor, small thermal inertia, small measurement hysteresis, and it is resistant to vibration and shock, and is easy to install.

[0100] Long life: The thermal resistor has a long service life and can meet the needs of long-term stable measurement.

[0101] In an embodiment of the present application, the heating circuit includes a heating module and a heating control switch, and the heating control switch is connected in series with the heating module. When the heating control switch is closed, the heating circuit is turned on, that is, a complete closed circuit is formed between the heating circuit and the charging pile (it can also be other equipment that can provide electrical energy, and the specific embodiment of the present application is not limited to this), and the heating module is in an enabled state, and can provide thermal energy for the battery cell to heat the battery cell. When the heating control switch is disconnected, the heating circuit is not turned on, that is, a complete closed circuit cannot be formed between the heating circuit and the charging pile, and the heating module is in an inoperative state, and cannot provide thermal energy for the battery cell, and cannot heat the battery cell.

[0102] In the embodiment of the present application, by connecting the heating control switch in series with the heating module, it is possible to achieve unified control, simplify circuit design, improve efficiency, have safety, facilitate troubleshooting, have effective thermal management, reduce interference, and reduce costs. Specifically:

[0103] Unified control: Connecting the heating control switch in series with the heating module can ensure that the heating module is under the direct control of the heating control switch, thereby achieving precise control of the heating process.

[0104] Simplified circuit design: Series connection can simplify the design of the heating circuit because all components in the heating circuit are on the same circuit path, which is easy to manage and maintain.

[0105] Improved efficiency: In a series circuit, the current is the same in all components of the heating circuit, which helps to improve energy efficiency because the current is not dispersed in different branches.

[0106] Safety aspect: Series connection can provide an extra layer of safety because if the heating control switch (such as a circuit breaker or contactor) is closed, the entire heating system will stop working, preventing overheating or fire risks.

[0107] Easy troubleshooting: In a series circuit, if there is a problem with the heating module, troubleshooting and repair are relatively simple because the current path is single.

[0108] With effective thermal management aspects: In a series circuit, the thermal resistance of the heating module is added to the thermal resistance of the heating control switch, which helps to more accurately calculate the thermal resistance of the entire power supply loop, thereby performing effective thermal management.

[0109] Reduced Interference: Series connections help reduce electromagnetic interference between different circuits because all components work on the same circuit path.

[0110] Cost reduction: Series designs may reduce costs in some cases because series circuits eliminate additional parallel components and complexity.

[0111] Optionally, the heating circuit further includes a circuit controller;

[0112] When it is detected that the battery is in the charging mode and the temperature of the battery cell is less than or equal to the first preset temperature, the circuit controller controls the heating control switch in the heating circuit to close.

[0113] In the embodiment of the present application, the circuit controller may be a battery monitoring and management system (BMS).

[0114] In the embodiment of the present application, the circuit controller determines that it is in the charging mode when it receives the charging signal transmitted by the charging pile; the circuit controller may also detect whether it is in the charging mode in other ways. The specific situation in which the circuit controller detects whether it is in the charging mode can be determined based on actual conditions, and the embodiment of the present application is not limited to this.

[0115] In the embodiment of the present application, the temperature of the battery cell can be detected by a circuit controller, or by other detection units. The specific method of detecting the problem of the battery cell can be determined according to the actual situation, and the embodiment of the present application is not limited to this.

[0116] In an embodiment of the present application, the first preset temperature may be a temperature configured in the battery circuit, or may be a temperature transmitted to the battery circuit by other devices. The specific manner in which the battery circuit obtains the first preset temperature may be determined based on actual conditions, and the embodiment of the present application does not limit this.

[0117] It should be noted that the first preset temperature is the temperature boundary between the lithium ion battery that will deposit lithium when charged and the lithium ion battery that will not deposit lithium when charged. That is, when the battery cell temperature is less than or equal to the first preset temperature, the lithium ion battery will deposit lithium when charged, and when the battery cell temperature is greater than the first preset temperature, the lithium ion battery will not deposit lithium when charged.

[0118] In an embodiment of the present application, after the heating control switch in the heating circuit is closed, a complete closed circuit is formed between the heating circuit and the charging pile (it can also be other equipment that can provide electrical energy, and the specific embodiment of the present application is not limited to this), and the heating module is in an enabled state, which can provide thermal energy for the battery cell and heat the battery cell.

[0119] It should be noted that the charging model may be a DC charging mode.

[0120] Optionally, when it is detected that the battery is in charging mode and the temperature of the battery cell rises to a temperature greater than the first preset temperature, the circuit controller controls the charging circuit to be turned on.

[0121] Optionally, when the positive charging relay is in a closed state, the circuit controller controls the positive charging circuit in the charging circuit to be turned on; when the negative charging relay is in a closed state, the circuit controller controls the negative charging circuit in the charging circuit to be turned on; when both the positive charging circuit and the negative charging circuit are in a conducting state, the charging circuit is in a conducting state.

[0122] In an embodiment of the present application, the charging circuit includes a positive charging circuit and a negative charging circuit. The positive charging circuit includes a positive charging relay, and the negative charging circuit includes a negative charging relay.

[0123] In the embodiment of the present application, the positive charging circuit may include a Hall sensor and a fuse in addition to the positive charging relay. The specific components included in the positive charging circuit may be determined based on actual conditions, and the embodiment of the present application does not limit this.

[0124] It should be noted that the fuse is used to disconnect the positive charging circuit when the current in the positive charging circuit is greater than or equal to the limiting current, thereby improving the safety during charging. Specifically, the Hall sensor is used to quickly detect small currents. When the detected current is greater than or equal to the limiting current, the controller is used to control the fuse to melt, thereby increasing the melting speed of the circuit, thereby protecting other electronic components in the circuit from damage and preventing the circuit from generating too much heat to cause fire or other safety accidents.

[0125] It should be noted that the limiting current is a current value determined according to the critical melting value of the fuse.

[0126] In the embodiment of the present application, the negative charging circuit may include a current sensor (SHUNT) in addition to the negative charging relay. The specific components included in the negative charging circuit may be determined based on actual conditions, and the embodiment of the present application does not limit this.

[0127] It should be noted that both the Hall sensor and the current sensor are used to detect current. Specifically, the Hall sensor is used to detect the current in the positive charging circuit, and the current sensor is used to detect the current in the negative charging circuit.

[0128] In the embodiment of the present application, the positive charging circuit, the negative charging circuit, the battery cell and the charging pile (which may also be other devices that can provide electrical energy, and the specific embodiment of the present application is not limited to this) form a complete charging circuit. Among them, the positive electrode of the battery cell is connected to the first end of the positive charging circuit, and the second end of the positive charging circuit is connected to the positive electrode of the charging pile; the negative electrode of the battery cell is connected to the first end of the negative charging circuit, and the second end of the negative charging circuit is connected to the negative electrode of the charging pile.

[0129] In the embodiment of the present application, when the positive charging relay is in a closed state, the positive charging circuit in the charging circuit is conductive; when the positive charging relay is in a disconnected state, the positive charging circuit in the charging circuit is not conductive.

[0130] In the embodiment of the present application, when the negative charging electrode relay is in a closed state, the negative charging electrode circuit in the charging circuit is conductive; when the negative charging electrode relay is in an open state, the negative charging electrode circuit in the charging circuit is not conductive.

[0131] It should be noted that the charging positive relay and the charging negative relay can be closed at the same time; the charging positive relay can be closed first, and then the charging negative relay; the charging negative relay can be closed first and then the charging positive relay; the specific closing order can be determined according to actual conditions, and the embodiments of the present application do not limit this.

[0132] Optionally, the heating control switch is in a closed state.

[0133] In an embodiment of the present application, when it is detected that the battery is in charging mode and the temperature of the battery cell rises to a temperature greater than the first preset temperature, the positive charging relay in the charging circuit and the negative charging relay in the charging circuit are closed, and at the same time, the heating control switch is also in a closed state.

[0134] Optionally, when it is detected that the battery is in charging mode and the temperature of the battery core rises to a temperature greater than a second preset temperature, the circuit controller controls to disconnect the heating control switch; when the heating control switch is disconnected, the heating circuit is not turned on;

[0135] The charging circuit is in a conducting state.

[0136] In the embodiment of the present application, when the charging positive electrode relay and the charging negative electrode relay are both in a closed state, the charging circuit is in a conducting state.

[0137] In an embodiment of the present application, the second preset temperature may be a temperature configured in the battery circuit, or may be a temperature transmitted to the battery circuit by other devices. The specific method in which the battery circuit obtains the second preset temperature may be determined based on actual conditions, and the embodiment of the present application does not limit this.

[0138] It should be noted that the second preset temperature is the maximum temperature at which the lithium battery can be heated while charging. Therefore, when the battery cell temperature is greater than the second preset temperature, the circuit controller will disconnect the heating control switch, that is, disconnect the heating circuit, to prevent the heating module from continuing to heat the battery cell.

[0139] In an embodiment of the present application, when it is detected that the battery is in charging mode and the temperature of the battery cell rises to a temperature greater than a second preset temperature, the heating control switch is disconnected. At this time, the lithium battery may not have been fully charged. Therefore, the charging positive relay and the charging negative relay are both in a closed state, and the charging positive circuit and the charging negative circuit are turned on, that is, the charging circuit is turned on, and the charging pile is used to continue charging the lithium battery until the charging of the lithium battery is completed.

[0140] Optionally, the discharge circuit further includes a pre-charge resistor, a pre-charge relay and a discharge positive relay;

[0141] The pre-charging relay and the pre-charging resistor are connected in series;

[0142] The discharge positive relay is connected in parallel with a series circuit formed by the pre-charging relay and the pre-charging resistor;

[0143] When receiving a discharge instruction, the circuit controller controls the pre-charge relay and the discharge negative relay in the discharge circuit to close, and controls the discharge positive relay to open; when detecting that the discharge current is less than or equal to a preset current, the circuit controller controls the pre-charge relay to open, and controls the discharge positive relay to close;

[0144] When the pre-charging relay is in a closed state, conducting a series circuit formed with the pre-charging resistor;

[0145] When the discharge cathode relay is in a closed state, conducting the discharge cathode circuit in the discharge circuit;

[0146] When the discharge positive electrode relay is in a closed state, the discharge positive electrode circuit in the discharge circuit is turned on.

[0147] In an embodiment of the present application, the pre-charging resistor may be a resistor having a resistance value greater than or equal to a preset resistance value.

[0148] It should be noted that the pre-charge relay is a relay provided for pre-charging resistance.

[0149] In an embodiment of the present application, when the discharge positive relay is connected in parallel with the series circuit formed by the pre-charging relay and the pre-charging resistor, the discharge positive circuit can be turned on when the discharge positive relay is closed; the discharge positive circuit can also be turned on when the pre-charging relay is closed, that is, when either the discharge positive relay or the pre-charging relay is in a closed state, the discharge positive circuit can be turned on; when both the discharge positive relay and the pre-charging relay are in a disconnected state, the discharge positive circuit is not turned on.

[0150] In the embodiment of the present application, when the discharge cathode relay is in a closed state, the discharge cathode loop in the discharge circuit is conductive; when the discharge cathode relay is in an open state, the discharge cathode loop in the discharge circuit is not conductive.

[0151] It should be noted that the preset current can be the current configured in the battery circuit, the preset current can also be the current transmitted to the battery circuit by other devices, and the preset current can also be the current obtained by the battery circuit through other means. The specific way in which the battery circuit obtains the preset current can be determined based on actual conditions, and the embodiments of the present application do not limit this.

[0152] In the embodiment of the present application, at the moment of battery discharge, the current in the discharge circuit will be relatively large, which is easy to break down the discharge positive relay. In order to protect the discharge positive relay, the pre-charge relay and the discharge negative relay can be closed first during discharge to turn on the discharge circuit. The discharge positive relay is not closed, and the pre-charge resistor is used to stabilize the discharge current in the discharge circuit at a level less than or equal to the preset current. Then the discharge positive relay is closed, and the discharge positive relay and the discharge negative relay are used to turn on the discharge circuit.

[0153] Optionally, the first switch is in an off state, and the first switch is a remaining switch in the battery circuit except the heating control switch.

[0154] In the embodiment of the present application, the number of switches in the first switch is at least one. The specific number of switches in the first switch can be determined according to actual conditions, and the embodiment of the present application does not limit this.

[0155] It should be noted that the first switch includes the remaining relays in the battery circuit except the heating control relay.

[0156] In the embodiment of the present application, an exemplary battery circuit is as follows Figure 2 As shown: including heating control relay (heating relay) KX1, discharge positive relay (main positive relay) K1, discharge negative relay (main negative relay) K2, pre-charge relay K3, charge positive relay (fast charge positive relay) K4, charge negative relay (fast charge negative relay) K5, pre-charge resistor, heating module, Hall sensor, fuse, current sensor (SHUNT), battery cell (battery cell +, battery cell -), charging positive (+) interface, charging negative (-) interface, discharge positive (+) interface, discharge negative (-) interface. When it is detected that it is in charging mode and the battery cell temperature is less than or equal to the first preset temperature, the heating control relay in the heating circuit is closed, thereby turning on the heating circuit, and the heating module in the heating circuit is in an enabled state. The heating module can provide heat energy for the battery cell to heat the battery cell. At this time, the remaining relays in the battery circuit except the heating control relay are in a disconnected state. At this stage, only the battery cell is heated and not charged. When it is detected that the battery is in charging mode and the temperature of the battery cell rises to a temperature greater than the first preset temperature, the positive charging relay in the charging circuit and the negative charging relay in the charging circuit are closed, and the positive charging circuit in the charging circuit and the negative charging circuit in the charging circuit are turned on, that is, the charging circuit is turned on to charge the battery cell through the charging interface (charging +, charging -) using the charging pile. At this time, the heating control switch is in a closed state, the heating circuit is turned on, and the heating module in the heating circuit is also heating the battery cell, that is, heating the battery cell and charging are carried out simultaneously at this stage. When it is detected that the battery is in charging mode and the temperature of the battery cell rises to a temperature greater than the second preset temperature, the heating control switch is turned off, and the heating module is stopped from heating the battery cell. At this time, the positive charging relay and the negative charging relay are both in a closed state. That is, only charging is performed at this stage without heating the battery cell. Among them, the positive discharge relay K1 and the negative discharge relay K2 are switches for controlling the discharge circuit, which can realize the high voltage power on and off at the vehicle end.

[0157] It should be noted that when the battery is powered on, the current is too large. The resistance is increased by the pre-charge relay K3 and the pre-charge resistor to protect the power battery and avoid damage to the battery due to excessive instantaneous current.

[0158] For example, Figure 3As shown: the circuit controller detects whether it is in the DC charging mode. If so, it detects the cell temperature of the battery cell. When the cell temperature is less than the third preset temperature (T0), the heating control switch in the heating circuit is closed (the heating relay KX1 is closed). At this time, the battery is only in the heating mode. The circuit controller (BMS) uses the charging pile to provide power to the heating circuit, and the heating module in the heating circuit provides heat energy to the cell. Then it detects whether the cell temperature is greater than the first preset temperature (whether the cell temperature is higher than T1). If so, the charging positive relay K4 in the charging circuit and the charging negative relay K5 in the charging circuit are closed. When K4 and K5 are closed, the charging circuit is in the on state. At this time, KX1 is also in the closed state. At this time, the battery is in the heating and charging mode. The BMS uses the charging pile to charge the battery while continuing to heat the cell and charge it. Then it detects whether the cell temperature is greater than the second preset temperature (whether the cell temperature is higher than T2). If so, KX1 is disconnected and K4 and K5 are not disconnected, that is, the heating of the cell is stopped, and the battery continues to be charged. At this time, the battery is only in the charging mode. When it is detected that the battery cell temperature is less than or equal to the second preset temperature (the battery cell temperature is not higher than T2), K4 and K5 continue to be closed, that is, the charging circuit is turned on, and the heating circuit is turned on at the same time. The BMS uses the charging pile to charge the battery while continuing to heat the battery cell until the battery cell temperature rises to a temperature greater than the second preset temperature. When it is detected that the battery cell temperature is less than or equal to the first preset temperature, KX1 is closed. At this time, the battery is only in the heating mode. The BMS uses the charging pile to provide electrical energy to the heating circuit, and the heating module in the heating circuit provides thermal energy to the battery cell until the battery cell temperature is greater than the first preset temperature. When the battery cell temperature is greater than or equal to the third preset temperature, the DC charging mode is directly turned on. If the circuit controller detects that it is not in the DC charging mode, it directly exits the charging mode and stops charging.

[0159] It should be noted that the third preset temperature is lower than the first preset temperature.

[0160] An embodiment of the present application provides a battery, which includes the battery circuit described above.

[0161] An embodiment of the present application provides a vehicle, which includes the battery described above.

[0162] It can be understood that the battery circuit includes a heating circuit, and the heating circuit, the charging circuit and the discharging circuit are all parallel circuits. The heating circuit also includes a heating control switch, which is used to control the conduction and disconnection of the heating circuit. The heating circuit and the charging circuit are also connected in parallel, so that decoupling control can be achieved between the charging circuit and the heating circuit. That is, when the battery cell temperature is insufficient, the heating control switch can be used to turn on the heating circuit to heat the battery cell. When the temperature of the battery cell rises to a level where there is no risk of lithium deposition, the charging circuit can be used to charge the battery cell, thereby avoiding the risk of lithium deposition when the battery is charged at low temperature, thereby improving the safety of the battery during charging.

[0163] The present application embodiment provides a battery charging method, a battery charging method applied to a battery circuit, Figure 4 A flow chart of a battery charging method provided in an embodiment of the present application is as follows: Figure 4 As shown, the battery charging method may include:

[0164] S101 : When it is detected that the battery is in charging mode, detect the battery cell temperature.

[0165] A battery charging method provided in an embodiment of the present application is suitable for charging a lithium battery.

[0166] In the embodiment of the present application, the battery circuit includes a circuit controller, and the circuit controller can be used to detect whether it is in a charging mode.

[0167] In the embodiment of the present application, the circuit controller may be a BMS.

[0168] In the embodiment of the present application, the circuit controller determines that it is in the charging mode when it receives the charging signal transmitted by the charging pile; the circuit controller may also detect whether it is in the charging mode in other ways. The specific situation in which the circuit controller detects whether it is in the charging mode can be determined based on actual conditions, and the embodiment of the present application is not limited to this.

[0169] In the embodiment of the present application, the temperature of the battery cell can be detected by a circuit controller, or by other detection units. The specific method of detecting the problem of the battery cell can be determined according to the actual situation, and the embodiment of the present application is not limited to this.

[0170] In the embodiment of the present application, the battery may be a lithium battery, and the battery cell may be a battery cell of a lithium battery.

[0171] In an embodiment of the present application, the battery circuit includes a charging circuit, a discharging circuit, a heating circuit and a battery cell. The heating circuit includes a heating control switch; the heating control switch is used to turn on the heating circuit; the charging circuit, the discharging circuit and the heating circuit are connected in parallel.

[0172] Specifically, the charging circuit and the discharging circuit are connected in parallel, the charging circuit and the heating circuit are connected in parallel, and the heating circuit and the discharging circuit are also connected in parallel.

[0173] In the embodiment of the present application, if the battery is a lithium battery, the charging circuit is a circuit for providing electrical energy to the lithium battery, the discharging circuit is a circuit for outputting electrical energy from the lithium battery, and the heating circuit is a circuit for heating the battery cells of the lithium battery.

[0174] For example, if the lithium battery is an energy supply component in a car, the charging circuit is a circuit for charging the lithium battery using a vehicle charging pile, the discharging circuit is a circuit for the lithium battery to output electrical energy to the vehicle, and the heating circuit is a circuit for heating the lithium battery cell.

[0175] In the embodiment of the present application, the heating control switch is a switch in the heating circuit. When the heating control switch is in a closed state, the heating circuit is conductive; when the heating control switch is in an open state, the heating circuit is also not conductive.

[0176] In the embodiment of the present application, the heating control switch can be a relay, the heating control switch can also be a diode, the heating control switch can also be other forms of switches. The specific heating control switch can be determined according to actual conditions, and the embodiment of the present application does not limit this.

[0177] S102 : When the battery cell temperature is less than or equal to a first preset temperature, heat the battery cell.

[0178] In the embodiment of the present application, after the battery circuit detects the battery cell temperature, if it is determined that the battery cell temperature is less than or equal to the first preset temperature, the battery cell is heated.

[0179] In an embodiment of the present application, when it is detected that the battery is in charging mode and the battery cell temperature is less than or equal to a first preset temperature, the heating control switch in the heating circuit is closed, thereby enabling the heating circuit, that is, the heating module in the heating circuit starts working to heat the battery cell.

[0180] In an embodiment of the present application, the first preset temperature may be a temperature configured in the battery circuit, or may be a temperature transmitted to the battery circuit by other devices. The specific manner in which the battery circuit obtains the first preset temperature may be determined based on actual conditions, and the embodiment of the present application does not limit this.

[0181] It should be noted that the first preset temperature is the temperature boundary between the lithium ion battery that will deposit lithium when charged and the lithium ion battery that will not deposit lithium when charged. That is, when the battery cell temperature is less than or equal to the first preset temperature, the lithium ion battery will deposit lithium when charged, and when the battery cell temperature is greater than the first preset temperature, the lithium ion battery will not deposit lithium when charged.

[0182] In an embodiment of the present application, the process of heating the battery cell by the battery circuit when the battery cell temperature is less than or equal to a first preset temperature includes: closing the heating control switch in the heating circuit when it is detected that the battery is in a charging mode and the battery cell temperature is less than or equal to the first preset temperature; starting the heating module in the heating circuit when the heating control switch is in a closed state; and heating the battery cell by using the heating module.

[0183] In an embodiment of the present application, after the heating control switch in the heating circuit is closed, a complete closed circuit is formed between the heating circuit and the charging pile (it can also be other equipment that can provide electrical energy, and the specific embodiment of the present application is not limited to this), and the heating module is in an enabled state (that is, the heating module is started), and then it can provide thermal energy to the battery cell to heat the battery cell.

[0184] It should be noted that the charging model may be a DC charging mode.

[0185] In an embodiment of the present application, the process of the battery circuit heating the battery cell also includes: disconnecting the positive charging relay and / or the negative charging relay in the charging circuit; when the positive charging relay and / or the negative charging relay are in the disconnected state, the charging circuit is not turned on; when the charging circuit is not turned on, charging of the battery cell is prohibited.

[0186] It should be noted that when the battery cell temperature is less than or equal to the first preset temperature, the battery cell is only heated but not charged.

[0187] In the embodiment of the present application, when any one of the positive charging relay and the negative charging relay in the charging circuit is in the disconnected state, the charging circuit is not conductive. When the charging circuit is not conductive, the battery cell cannot be charged, that is, charging of the battery cell is prohibited.

[0188] S103 . When the temperature of the battery cell rises to a temperature greater than a first preset temperature, charge the battery cell.

[0189] In the embodiment of the present application, after the battery circuit heats the battery cell, when the temperature of the battery cell rises to a temperature greater than the first preset temperature, the battery cell is charged.

[0190] In an embodiment of the present application, the charging circuit includes a positive charging circuit and a negative charging circuit. The positive charging circuit includes a positive charging relay, and the negative charging circuit includes a negative charging relay.

[0191] In the embodiment of the present application, the positive charging circuit may include a Hall sensor and a fuse in addition to the positive charging relay. The specific components included in the positive charging circuit may be determined based on actual conditions, and the embodiment of the present application does not limit this.

[0192] It should be noted that the fuse is used to disconnect the positive charging circuit when the current in the positive charging circuit is greater than or equal to the limiting current, thereby improving the safety during charging. Specifically, the Hall sensor is used to quickly detect small currents. When the detected current is greater than or equal to the limiting current, the controller is used to control the fuse to melt, thereby increasing the melting speed of the circuit, thereby protecting other electronic components in the circuit from damage and preventing the circuit from generating too much heat to cause fire or other safety accidents.

[0193] It should be noted that the limiting current is a current value determined according to the critical melting value of the fuse.

[0194] In the embodiment of the present application, the negative charging circuit may include a current sensor (SHUNT) in addition to the negative charging relay. The specific components included in the negative charging circuit may be determined based on actual conditions, and the embodiment of the present application does not limit this.

[0195] It should be noted that both the Hall sensor and the current sensor are used to detect current. Specifically, the Hall sensor is used to detect the current in the positive charging circuit, and the current sensor is used to detect the current in the negative charging circuit.

[0196] In the embodiment of the present application, the positive charging circuit, the negative charging circuit, the battery cell and the charging pile (which may also be other devices that can provide electrical energy, and the specific embodiment of the present application is not limited to this) form a complete charging circuit. Among them, the positive electrode of the battery cell is connected to the first end of the positive charging circuit, and the second end of the positive charging circuit is connected to the positive electrode of the charging pile; the negative electrode of the battery cell is connected to the first end of the negative charging circuit, and the second end of the negative charging circuit is connected to the negative electrode of the charging pile.

[0197] In the embodiment of the present application, when the positive charging relay is in a closed state, the positive charging circuit in the charging circuit is conductive; when the positive charging relay is in a disconnected state, the positive charging circuit in the charging circuit is not conductive.

[0198] In the embodiment of the present application, when the negative charging electrode relay is in a closed state, the negative charging electrode circuit in the charging circuit is conductive; when the negative charging electrode relay is in an open state, the negative charging electrode circuit in the charging circuit is not conductive.

[0199] In the embodiment of the present application, by controlling the negative charging relay and the positive charging relay to be closed, the negative charging circuit and the positive charging circuit are turned on, that is, the charging circuit is turned on to charge the battery cell.

[0200] In an embodiment of the present application, the process of charging the battery cell by the battery circuit when the temperature of the battery cell rises to a temperature greater than the first preset temperature includes: closing the positive charging relay and the negative charging relay in the charging circuit when it is detected that the battery cell is in a charging mode and the temperature of the battery cell rises to a temperature greater than the first preset temperature; turning on the charging circuit when both the positive charging relay and the negative charging relay are in a closed state; and charging the battery cell using the charging circuit.

[0201] In the embodiment of the present application, when the positive charging relay and the negative charging relay are both in a closed state, the charging circuit is turned on, and the charging circuit can be used to charge the battery cell.

[0202] It should be noted that the charging positive relay and the charging negative relay can be closed at the same time; the charging positive relay can be closed first, and then the charging negative relay; the charging negative relay can be closed first and then the charging positive relay; the specific closing order can be determined according to actual conditions, and the embodiments of the present application do not limit this.

[0203] In an embodiment of the present application, the process of charging the battery cell by the battery circuit further includes: heating the battery cell; when the temperature of the battery cell rises to a temperature greater than a second preset temperature, stopping heating the battery cell and continuing to charge the battery cell.

[0204] In an embodiment of the present application, when it is detected that the battery is in charging mode and the temperature of the battery cell rises to a temperature greater than the first preset temperature, the positive charging relay in the charging circuit and the negative charging relay in the charging circuit are closed, and at the same time, the heating control switch is also in a closed state, thereby controlling the heating of the battery cell.

[0205] In the embodiment of the present application, when it is detected that the battery is in the charging mode and the temperature of the battery core rises to a temperature greater than the second preset temperature, the heating control switch is turned off;

[0206] The positive charging relay and the negative charging relay are both in a closed state.

[0207] In an embodiment of the present application, the second preset temperature may be a temperature configured in the battery circuit, or may be a temperature transmitted to the battery circuit by other devices. The specific method in which the battery circuit obtains the second preset temperature may be determined based on actual conditions, and the embodiment of the present application does not limit this.

[0208] It should be noted that the second preset temperature is the maximum temperature at which the lithium battery can be heated while charging. Therefore, when the battery cell temperature is greater than the second preset temperature, the circuit controller will disconnect the heating control switch, that is, disconnect the heating circuit, to prevent the heating module from continuing to heat the battery cell.

[0209] In an embodiment of the present application, when it is detected that the battery is in charging mode and the temperature of the battery cell rises to a temperature greater than a second preset temperature, the heating control switch is disconnected. At this time, the lithium battery may not have been fully charged. Therefore, the charging positive relay and the charging negative relay are both in a closed state, and the charging positive circuit and the charging negative circuit are turned on, that is, the charging circuit is turned on, and the charging pile is used to continue charging the lithium battery until the charging of the lithium battery is completed.

[0210] In an embodiment of the present application, the process of the battery circuit stopping heating the battery cell includes: disconnecting the heating control switch in the heating circuit; when the heating control switch is in the disconnected state, the heating module in the heating circuit is not started; when the heating module is not started, stopping heating the battery cell.

[0211] In the embodiment of the present application, when the heating control switch is in the off state, the heating module in the heating circuit cannot be started; when the heating module is not started, the heating module cannot be used to heat the battery cell, that is, the heating of the battery cell is stopped.

[0212] In an embodiment of the present application, after the battery circuit charges the battery cell, upon receiving a discharge instruction, the pre-charge relay in the discharge circuit and the discharge negative pole relay in the discharge circuit are closed, and the discharge positive pole relay in the discharge circuit is disconnected; when the pre-charge relay and the discharge negative pole relay are closed and it is detected that the discharge current in the discharge circuit is less than or equal to a preset current, the pre-charge relay is disconnected and the discharge positive pole relay is closed; when the pre-charge relay is in an disconnected state and the discharge positive pole relay is in a closed state, the discharge circuit is in an on state; when the discharge circuit is in an on state, the battery is discharged using the discharge circuit.

[0213] In an embodiment of the present application, the pre-charging resistor may be a resistor having a resistance value greater than or equal to a preset resistance value.

[0214] It should be noted that the pre-charge relay is a relay provided for pre-charging resistance.

[0215] In an embodiment of the present application, when the discharge positive relay is connected in parallel with the series circuit formed by the pre-charging relay and the pre-charging resistor, the discharge positive circuit can be turned on when the discharge positive relay is closed; the discharge positive circuit can also be turned on when the pre-charging relay is closed, that is, when either the discharge positive relay or the pre-charging relay is in a closed state, the discharge positive circuit can be turned on; when both the discharge positive relay and the pre-charging relay are in a disconnected state, the discharge positive circuit is not turned on.

[0216] In the embodiment of the present application, when the discharge cathode relay is in a closed state, the discharge cathode loop in the discharge circuit is conductive; when the discharge cathode relay is in an open state, the discharge cathode loop in the discharge circuit is not conductive.

[0217] It should be noted that the preset current can be the current configured in the battery circuit, the preset current can also be the current transmitted to the battery circuit by other devices, and the preset current can also be the current obtained by the battery circuit through other means. The specific way in which the battery circuit obtains the preset current can be determined based on actual conditions, and the embodiments of the present application do not limit this.

[0218] In the embodiment of the present application, at the moment of battery discharge, the current in the discharge circuit will be relatively large, which is easy to break down the discharge positive relay. In order to protect the discharge positive relay, the pre-charge relay and the discharge negative relay can be closed first during discharge to turn on the discharge circuit. The discharge positive relay is not closed, and the pre-charge resistor is used to stabilize the discharge current in the discharge circuit at a level less than or equal to the preset current. Then the discharge positive relay is closed, and the discharge positive relay and the discharge negative relay are used to turn on the discharge circuit.

[0219] It can be understood that when the battery circuit detects that it is in charging mode, it first detects the battery cell temperature. When the battery cell temperature is insufficient, that is, the battery cell temperature is less than or equal to the first preset temperature, the battery cell is heated. When the battery cell temperature rises to a level where there is no risk of lithium deposition, that is, the battery cell temperature rises to a level greater than the first preset temperature, the battery cell is charged, thereby avoiding the risk of lithium deposition when the battery is charged at a low temperature and improving the safety of the battery during charging.

[0220] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of hardware embodiments, software embodiments, or embodiments in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0221] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0222] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0223] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0224] The above is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the present application are included in the protection scope of the present application.

Claims

1. A battery circuit, characterized in that: The battery circuit comprises: A charging circuit, a discharging circuit and a heating circuit; the heating circuit includes a heating control switch; The charging circuit, the discharging circuit and the heating circuit are connected in parallel; When the heating control switch is closed, the heating circuit is turned on.

2. The circuit according to claim 1, characterized in that The heating circuit includes a heating module; The heating control switch is connected in series with the heating module; When the heating control switch is closed, starting the heating module; When the heating control switch is turned off, starting the heating module is prohibited.

3. The circuit according to claim 1 or 2, characterized in that: The heating circuit also includes a circuit controller; When it is detected that the battery is in the charging mode and the temperature of the battery cell is less than or equal to the first preset temperature, the circuit controller controls the heating control switch in the heating circuit to close.

4. The circuit according to claim 3, characterized in that When it is detected that the battery is in charging mode and the temperature of the battery cell rises to a temperature greater than the first preset temperature, the circuit controller controls the charging circuit to be turned on.

5. The circuit according to claim 4, characterized in that When the charging positive electrode relay is in a closed state, the circuit controller controls the charging positive electrode circuit in the charging circuit to be turned on; When the negative charging electrode relay is in a closed state, the circuit controller controls the negative charging electrode circuit in the charging circuit to be turned on; When both the charging positive electrode circuit and the charging negative electrode circuit are in the conducting state, the charging circuit is in the conducting state.

6. The circuit according to any one of claims 3 to 5, characterized in that: When it is detected that the battery is in charging mode and the temperature of the battery core rises to a temperature greater than a second preset temperature, the circuit controller controls to turn off the heating control switch; When the heating control switch is disconnected, the heating circuit is not turned on; The charging circuit is in a conducting state.

7. The circuit according to any one of claims 3 to 6, characterized in that: The discharge circuit also includes a pre-charge resistor, a pre-charge relay and a discharge positive relay; The pre-charging relay and the pre-charging resistor are connected in series; The discharge positive relay is connected in parallel with a series circuit formed by the pre-charging relay and the pre-charging resistor; When receiving a discharge instruction, the circuit controller controls the pre-charge relay and the discharge negative relay in the discharge circuit to close, and controls the discharge positive relay to open; when detecting that the discharge current is less than or equal to a preset current, the circuit controller controls the pre-charge relay to open, and controls the discharge positive relay to close; When the pre-charging relay is in a closed state, conducting a series circuit formed with the pre-charging resistor; When the discharge cathode relay is in a closed state, conducting the discharge cathode circuit in the discharge circuit; When the discharge positive electrode relay is in a closed state, the discharge positive electrode circuit in the discharge circuit is turned on.

8. The circuit according to any one of claims 3 to 7, characterized in that: The first switch is in an off state, and the first switch is a remaining switch in the battery circuit except the heating control switch.

9. A battery charging method, characterized in that: The method comprises: When it is detected that the battery is in charging mode, the battery cell temperature is detected; When the temperature of the battery cell is less than or equal to a first preset temperature, heating the battery cell of the battery; When the temperature of the battery cell rises to a temperature greater than the first preset temperature, the battery cell is charged.

10. The method according to claim 9, characterized in that When the temperature of the battery cell is less than or equal to a first preset temperature, heating the battery cell of the battery comprises: When it is detected that the battery is in charging mode and the temperature of the battery cell is less than or equal to the first preset temperature, closing the heating control switch in the heating circuit; When the heating control switch is in a closed state, the heating module in the heating circuit is started; The heating module is used to heat the battery cell.

11. The method according to claim 9, characterized in that When the temperature of the battery cell rises to a temperature greater than the first preset temperature, charging the battery cell comprises: When it is detected that the battery is in charging mode and the temperature of the battery cell rises to a temperature greater than the first preset temperature, closing the positive charging relay and the negative charging relay in the charging circuit; When the charging positive electrode relay and the charging negative electrode relay are both in a closed state, turning on the charging circuit; The battery cell is charged by utilizing the charging circuit.

12. The method according to any one of claims 9 to 10, characterized in that: The heating of the battery cell further comprises: Disconnecting the positive charging relay and / or the negative charging relay in the charging circuit; When the charging positive relay and / or the charging negative relay are in the disconnected state, the charging circuit is not turned on; When the charging circuit is not conducting, charging of the battery cell is prohibited.

13. The method according to claim 9, characterized in that The charging of the battery cell further comprises: heating the battery cell; When the temperature of the battery cell rises to a temperature greater than a second preset temperature, the heating of the battery cell is stopped, and the charging of the battery cell continues.

14. The method according to claim 13, characterized in that The step of stopping heating the battery cell comprises: Disconnect the heating control switch in the heating circuit; When the heating control switch is in the off state, the heating module in the heating circuit is not started; When the heating module is not started, the heating of the battery cell is stopped.

15. The method according to any one of claims 9 to 14, characterized in that: After charging the battery cell, the method further includes: When receiving a discharge instruction, closing the pre-charge relay in the discharge circuit and the discharge negative relay in the discharge circuit, and disconnecting the discharge positive relay in the discharge circuit; When the pre-charging relay and the discharge cathode relay are closed and it is detected that the discharge current in the discharge circuit is less than or equal to a preset current, the pre-charging relay is disconnected and the discharge cathode relay is closed; When the pre-charging relay is in an open state and the discharge positive relay is in a closed state, the discharge circuit is in a conducting state; When the discharge circuit is in a conducting state, the battery is discharged by using the discharge circuit.

16. A battery, characterized in that: The battery comprises a battery circuit as claimed in any one of claims 1 to 8.

17. A vehicle, characterized in that: The vehicle includes the battery of claim 16.

Images