Charging and discharging device of battery pack, electric automobile, battery swap station and battery charging and swap bin of battery swap station

Abstract

The invention discloses a charging and discharging device of a battery pack, an electric vehicle, a battery swap station and a charging and swap bin of the battery pack. The charging device comprises a high-voltage control module, and the high-voltage control module comprises a first high-voltage end, a second high-voltage end, a charging circuit, a heating circuit and a heating output end; the first high-voltage end and the second high-voltage end are electrically connected through the charging circuit, one end of the heating circuit is electrically connected with the charging circuit, and the other end of the heating circuit is electrically connected with the heating output end; the first high-voltage end is electrically connected with an external power supply, the second high-voltage end is electrically connected with a high-voltage wiring end of the battery pack, and the heating output end is electrically connected with a heating wiring end of the battery pack. According to the invention, one or more battery packs can be synchronously heated while the battery packs are charged and the external equipment is discharged, so that the heating efficiency is effectively improved, and the heating cost is reduced; in addition, the heating circuit in the device has the advantages of being simple in structure, low in cost and the like.

Description

[0001] This application is a division of a Chinese invention patent with an application date of July 6, 2020, application number 202010643289.4, and name “Battery pack charging and discharging device, electric vehicle, battery swap station and charging and swapping warehouse thereof”. Technical Field

[0002] The present application relates to the field of new energy vehicle technology, and in particular to a battery pack charging and discharging device, an electric vehicle, a battery swap station and a charging and swapping station thereof. Background Art

[0003] Battery packs are mainly used to provide power for new energy electric vehicles, and the power supply capacity of battery packs directly affects the endurance of electric vehicles. However, in low temperature environments, the chemical reaction rate of battery packs will slow down, resulting in a decrease in the available capacity of the battery packs, which cannot meet actual usage needs. Therefore, it is necessary to heat the battery packs when they are at low temperatures to achieve fast and efficient charging of the battery packs.

[0004] At present, the existing heating structures are set inside each battery pack to achieve independent heating function for each battery pack. However, for vehicles equipped with multiple battery packs (such as commercial vehicles), this heating method requires that each battery pack be equipped with a heating structure, which increases the hardware construction cost, manpower investment cost and heating structure cost, resulting in high costs and waste of human resources. In addition, different battery packs have different heating time points and durations, resulting in uneven heating degree and low heating efficiency. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the heating circuit of the battery pack in the prior art, such as high heating cost and low heating efficiency, and the purpose is to provide a battery pack charging and discharging device, an electric car, a battery swap station and a charging and swapping warehouse thereof.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a charging device for a battery pack, wherein the battery pack comprises a high voltage terminal and a heating terminal, wherein the heating terminal is electrically connected to a heating film in the battery pack;

[0008] The charging device includes a high-voltage control module, and the high-voltage control module includes a first high-voltage terminal, a second high-voltage terminal, a charging circuit, a heating circuit, and a heating output terminal; the first high-voltage terminal and the second high-voltage terminal are electrically connected through the charging circuit, one end of the heating circuit is electrically connected to the charging circuit, and the other end of the heating circuit is electrically connected to the heating output terminal;

[0009] The first high-voltage terminal is electrically connected to an external power source, the second high-voltage terminal is electrically connected to the high-voltage terminal of the battery pack, and the heating output terminal is electrically connected to the heating terminal of the battery pack;

[0010] Wherein, when the charging circuit is used to charge the battery pack, the heating circuit is used to heat the battery pack. By providing a heating circuit in the charging device, the battery pack can be heated in a low temperature environment so that it can quickly reach a more ideal temperature range for charging, thereby improving the charging efficiency and reducing the impact of temperature on the charging of the battery pack.

[0011] Preferably, the first high-voltage terminal includes a charging high-voltage positive terminal and a charging high-voltage negative terminal, the second high-voltage terminal includes a battery high-voltage positive terminal and a battery high-voltage negative terminal, and the high-voltage terminal includes a high-voltage positive terminal and a high-voltage negative terminal;

[0012] The battery high voltage positive terminal is electrically connected to the high voltage positive terminal, and the battery high voltage negative terminal is electrically connected to the high voltage negative terminal. The arrangement of each terminal can realize a quick electrical connection between the battery pack, the charging device and the external power source, which is convenient for actual on-site operation and ensures the stability and safety of the connection.

[0013] Preferably, the charging circuit comprises a positive charging relay and a negative charging relay;

[0014] One end of the charging positive relay is electrically connected to the charging high voltage positive terminal, and the other end of the charging positive relay is electrically connected to the first input end of the heating circuit and the battery high voltage positive terminal respectively;

[0015] One end of the charging negative relay is electrically connected to the charging high voltage negative terminal, and the other end of the charging negative relay is electrically connected to the second input terminal of the heating circuit and the battery high voltage negative terminal. By setting a charging positive relay and a charging negative relay in the charging device, the function of charging or stopping charging of the battery pack can be realized, that is, when the charging positive relay and the charging negative relay are both in a closed state, the external power supply charges the battery pack; when the charging positive relay and / or the charging negative relay are in an open state, the external power supply stops charging the battery pack.

[0016] Preferably, the heating circuit comprises a heating positive relay and a heating negative relay;

[0017] One end of the heating positive relay is electrically connected to the other end of the charging positive relay and the high voltage positive end of the battery, respectively, and the other end of the heating positive relay is electrically connected to the heating output end;

[0018] One end of the heating negative relay is electrically connected to the other end of the charging negative relay and the high voltage negative end of the battery, respectively, and the other end of the heating negative relay is electrically connected to the heating output end. By arranging a heating positive relay and a heating negative relay in the heating circuit, the function of starting or stopping the heating of the battery pack can be realized, that is, when the heating positive relay and the heating negative relay are both in a closed state, the battery pack is heated; when the heating positive relay and / or the heating negative relay are in an open state, the heating of the battery pack is stopped.

[0019] Preferably, the heating circuit further comprises a first overload protection switch and a second overload protection switch;

[0020] One end of the first overload protection switch is electrically connected to the other end of the heating positive relay, and the other end of the first overload protection switch is electrically connected to the heating output end;

[0021] One end of the second overload protection switch is electrically connected to the other end of the heating negative relay, and the other end of the second overload protection switch is electrically connected to the heating output end. By arranging the first overload protection switch and the second overload protection switch in the heating circuit, overheat protection of the heating circuit can be achieved, that is, when overheating occurs in the heating circuit, the first overload protection switch and / or the second overload protection switch will automatically disconnect to cut off the heating circuit to avoid continued heating.

[0022] Preferably, the charging device further comprises a low voltage signal control module;

[0023] The high-voltage control module further includes a command receiving terminal, and the battery pack further includes a low-voltage interface terminal;

[0024] The low-voltage signal control module is electrically connected to the heating circuit via the instruction receiving end, and the low-voltage signal control module is communicatively connected to the low-voltage interface end;

[0025] The low-voltage signal control module is used to collect temperature data corresponding to the battery pack through the low-voltage interface end, compare the temperature data with a set threshold, and generate a first trigger instruction when the temperature data is less than the set threshold and send it to the instruction receiving end to trigger the heating positive relay and the heating negative relay to close;

[0026] Wherein, when the heating positive relay and the heating negative relay are both closed, the heating circuit is used to heat the battery pack. By setting a low-voltage signal control module in the charging device, the temperature value of the battery pack can be monitored in real time, and the heating function is automatically turned on when the temperature value is less than the set value, that is, the automation of the heating function is realized, ensuring the timeliness of heating the battery pack.

[0027] Preferably, when the battery pack is heated, the low-voltage signal control module is further used to generate a second trigger instruction when the temperature data is greater than or equal to the set threshold and send it to the instruction receiving end to trigger the heating positive relay and the heating negative relay to be disconnected;

[0028] Wherein, when the heating positive relay and the heating negative relay are both disconnected, the heating circuit is used to stop heating the battery pack. When the low-voltage signal control module detects that the temperature value of the battery pack is greater than or equal to the set value, the heating function is automatically stopped, thereby avoiding the waste of electric energy resources and also avoiding the overheating of the battery pack.

[0029] Preferably, the high voltage control module further comprises a circuit breaker;

[0030] One end of the circuit breaker is electrically connected to one end of the heating positive relay, and the other end of the circuit breaker is electrically connected to the high voltage positive terminal of the battery. The circuit breaker is arranged in the main circuit of the charging device to facilitate disconnecting the main circuit during the actual maintenance process; in addition, the circuit breaker is built with a fuse to play a circuit breaker protection function.

[0031] And / or, the high voltage control module further includes a current sensor;

[0032] One end of the current sensor is electrically connected to one end of the heating negative relay and the other end of the charging negative relay, and the other end of the current sensor is electrically connected to the high voltage negative terminal of the battery. The setting of the current sensor facilitates monitoring of the corresponding charging current size when the battery pack is charged.

[0033] The present invention also provides a discharge device for a battery pack, the battery pack comprising a high voltage terminal and a heating terminal, the heating terminal being electrically connected to a heating film in the battery pack;

[0034] The discharge device further includes a high-voltage control module, which includes a first high-voltage terminal, a second high-voltage terminal, a discharge circuit, a heating circuit, and a heating output terminal; the first high-voltage terminal and the second high-voltage terminal are electrically connected through the discharge circuit, one end of the heating circuit is electrically connected to the discharge circuit, and the other end of the heating circuit is electrically connected to the heating output terminal;

[0035] The first high-voltage terminal is electrically connected to an external device, the second high-voltage terminal is electrically connected to the high-voltage terminal of the battery pack, and the heating output terminal is electrically connected to the heating terminal of the battery pack;

[0036] Wherein, when the discharge circuit is used to supply power to the external device, the heating circuit is used to heat the battery pack. By providing a heating circuit in the discharge device, the battery pack can be heated in a low temperature environment so that it can quickly reach a more ideal temperature range for discharge, thereby improving the discharge efficiency and reducing the influence of temperature on the discharge of the battery pack.

[0037] Preferably, the first high-voltage terminal includes a discharge high-voltage positive terminal and a discharge high-voltage negative terminal, the second high-voltage terminal includes a battery high-voltage positive terminal and a battery high-voltage negative terminal, and the high-voltage terminal includes a high-voltage positive terminal and a high-voltage negative terminal;

[0038] The battery high voltage positive terminal is electrically connected to the high voltage positive terminal, and the battery high voltage negative terminal is electrically connected to the high voltage negative terminal. The arrangement of each terminal can realize a quick electrical connection between the battery pack, the charging device and the external power source, which is convenient for actual on-site operation and ensures the stability and safety of the connection.

[0039] Preferably, the discharge circuit comprises a discharge positive relay and a discharge negative relay;

[0040] One end of the discharge positive relay is electrically connected to the discharge high voltage positive terminal, and the other end of the discharge positive relay is electrically connected to the first input end of the heating circuit and the battery high voltage positive terminal;

[0041] One end of the discharge negative relay is electrically connected to the discharge high voltage negative terminal, and the other end of the discharge negative relay is electrically connected to the second input terminal of the heating circuit and the battery high voltage negative terminal. By arranging a discharge positive relay and a discharge negative relay in the discharge device, the function of discharging or stopping the discharge of the battery pack can be realized, that is, when the discharge positive relay and the discharge negative relay are both in a closed state, the external power supply discharges the battery pack; when the discharge positive relay and / or the discharge negative relay are in an open state, the external power supply stops discharging the battery pack.

[0042] Preferably, the high voltage control module further comprises a pre-charging relay and a pre-charging resistor;

[0043] One end of the pre-charging relay is electrically connected to the first input end of the heating circuit, the other end of the pre-charging relay is electrically connected to one end of the pre-charging resistor, and the other end of the pre-charging resistor is electrically connected to the discharge high voltage positive end. By providing the pre-charging relay and the pre-charging resistor, the capacitor at the front end of the motor can be charged when the battery pack discharges the vehicle.

[0044] Preferably, the heating circuit includes a heating positive relay and a heating negative relay.

[0045] One end of the heating positive relay is electrically connected to the other end of the discharge positive relay and the high voltage positive end of the battery, respectively, and the other end of the heating positive relay is electrically connected to the heating output end;

[0046] One end of the heating negative relay is electrically connected to the other end of the discharge negative relay and the high voltage negative end of the battery, respectively, and the other end of the heating negative relay is electrically connected to the heating output end. By arranging a heating positive relay and a heating negative relay in the heating circuit, the function of starting or stopping the heating of the battery pack can be realized, that is, when the heating positive relay and the heating negative relay are both in a closed state, the battery pack is heated; when the heating positive relay and / or the heating negative relay are in an open state, the heating of the battery pack is stopped.

[0047] Preferably, the heating circuit further comprises a first overload protection switch and a second overload protection switch;

[0048] One end of the first overload protection switch is electrically connected to the other end of the heating positive relay, and the other end of the first overload protection switch is electrically connected to the heating output end;

[0049] One end of the second overload protection switch is electrically connected to the other end of the heating negative relay, and the other end of the second overload protection switch is electrically connected to the heating output end. By setting the first overload protection switch and the second overload protection switch in the heating circuit, overheating protection of the heating circuit can be achieved, that is, when overheating occurs in the heating circuit, the first overload protection switch and / or the second overload protection switch will automatically disconnect to cut off the heating circuit to avoid continued heating. Preferably, the discharge device also includes a low-voltage signal control module;

[0050] The high-voltage control module further includes a command receiving terminal, and the battery pack further includes a low-voltage interface terminal;

[0051] The low-voltage signal control module is electrically connected to the heating circuit via the instruction receiving end, and the low-voltage signal control module is communicatively connected to the low-voltage interface end;

[0052] The low-voltage signal control module is used to collect temperature data corresponding to the battery pack through the low-voltage interface end, compare the temperature data with a set threshold, and generate a first trigger instruction when the temperature data is less than the set threshold and send it to the instruction receiving end to trigger the heating positive relay and the heating negative relay to close;

[0053] Wherein, when the heating positive relay and the heating negative relay are both closed, the heating circuit is used to heat the battery pack. By setting a low-voltage signal control module in the discharge device, the temperature value of the battery pack can be monitored in real time, and the heating function is automatically turned on when the temperature value is less than the set value, that is, the automation of the heating function is realized, and the timeliness of the heating of the battery pack is ensured. Preferably, when heating the battery pack, the low-voltage signal control module is also used to generate a second trigger instruction when the temperature data is greater than or equal to the set threshold and send it to the instruction receiving end to trigger the heating positive relay and the heating negative relay to disconnect;

[0054] Wherein, when the heating positive relay and the heating negative relay are both disconnected, the heating circuit is used to stop heating the battery pack. When the low-voltage signal control module detects that the temperature value of the battery pack is greater than or equal to the set value, the heating function is automatically stopped, thereby avoiding the waste of electric energy resources and also avoiding the overheating of the battery pack.

[0055] Preferably, the high voltage control module further comprises a circuit breaker;

[0056] One end of the circuit breaker is electrically connected to one end of the heating positive relay, and the other end of the circuit breaker is electrically connected to the high voltage positive terminal of the battery. The circuit breaker is arranged in the main circuit of the discharge device to facilitate disconnecting the main circuit during the actual maintenance process; in addition, the circuit breaker is built with a fuse to play the function of circuit breaker protection.

[0057] And / or, the high voltage control module further includes a current sensor;

[0058] One end of the current sensor is electrically connected to one end of the heating negative relay, and the other end of the current sensor is electrically connected to the high voltage negative terminal of the battery. The setting of the current sensor facilitates monitoring of the corresponding discharge current size when the battery pack is discharged.

[0059] The present invention also provides a charging and discharging device for a battery pack, wherein the battery pack comprises a high voltage terminal and a heating terminal, wherein the heating terminal is electrically connected to a heating film in the battery pack;

[0060] The charging and discharging device comprises a high-voltage control module, and the high-voltage control module comprises a first high-voltage terminal, a second high-voltage terminal, a charging circuit, a discharging circuit, a heating circuit and a heating output terminal;

[0061] The second high-voltage terminal is electrically connected to the high-voltage terminal of the battery pack, and the heating output terminal is electrically connected to the heating terminal of the battery pack;

[0062] When the charging and discharging device is in a charging state, the first high-voltage end is electrically connected to an external power source, the first high-voltage end and the second high-voltage end are electrically connected via the charging circuit, one end of the heating circuit is electrically connected to the charging circuit, and the other end of the heating circuit is electrically connected to the heating output end;

[0063] Wherein, when the charging circuit is used to charge the battery pack, the heating circuit is used to heat the battery pack; the battery pack can be heated in a low temperature environment so that it can quickly reach a more ideal temperature range for charging, improve charging efficiency, and reduce the impact of temperature on the charging of the battery pack. When the charging and discharging device is in a discharging state, the first high-voltage end is electrically connected to an external device, the first high-voltage end and the second high-voltage end are electrically connected through the discharge circuit, one end of the heating circuit is electrically connected to the discharge circuit, and the other end of the heating circuit is electrically connected to the heating output end;

[0064] Wherein, when the discharge circuit is used to supply power to the external device, the heating circuit is used to heat the battery pack. The battery pack can be heated in a low temperature environment so that it can quickly reach a more ideal temperature range for discharge, improve discharge efficiency, and reduce the impact of temperature on battery pack discharge. Preferably, when the charging and discharging device is in a charging state, the first high-voltage end includes a charging high-voltage positive end and a charging high-voltage negative end;

[0065] When the charging and discharging device is in a discharging state, the first high-voltage end includes a discharging high-voltage positive end and a discharging high-voltage negative end;

[0066] The second high-voltage terminal includes a battery high-voltage positive terminal and a battery high-voltage negative terminal, and the high-voltage terminal includes a high-voltage positive terminal and a high-voltage negative terminal;

[0067] The battery high voltage positive terminal is electrically connected to the high voltage positive terminal, and the battery high voltage negative terminal is electrically connected to the high voltage negative terminal. The arrangement of each terminal can realize a quick electrical connection between the battery pack, the charging device and the external power source, which is convenient for actual on-site operation while ensuring the stability and safety of the connection. Preferably, the charging circuit includes a charging positive relay and a charging negative relay;

[0068] One end of the charging positive relay is electrically connected to the charging high voltage positive terminal, and the other end of the charging positive relay is electrically connected to the first input end of the heating circuit and the battery high voltage positive terminal respectively;

[0069] One end of the charging negative relay is electrically connected to the charging high-voltage negative terminal, and the other end of the charging negative relay is electrically connected to the second input terminal of the heating circuit and the battery high-voltage negative terminal respectively; by arranging a charging positive relay and a charging negative relay in the charging device, the function of charging or stopping charging of the battery pack can be realized, that is, when the charging positive relay and the charging negative relay are both in a closed state, the external power supply charges the battery pack; when the charging positive relay and / or the charging negative relay are in a disconnected state, the external power supply stops charging the battery pack.

[0070] The discharge circuit includes a discharge positive relay and a discharge negative relay;

[0071] One end of the discharge positive relay is electrically connected to the discharge high voltage positive terminal, and the other end of the discharge positive relay is electrically connected to the first input end of the heating circuit and the battery high voltage positive terminal;

[0072] One end of the discharge negative relay is electrically connected to the discharge high voltage negative terminal, and the other end of the discharge negative relay is electrically connected to the second input terminal of the heating circuit and the battery high voltage negative terminal. By arranging a discharge positive relay and a discharge negative relay in the discharge device, the function of discharging or stopping the discharge of the battery pack can be realized, that is, when the discharge positive relay and the discharge negative relay are both in a closed state, the external power supply discharges the battery pack; when the discharge positive relay and / or the discharge negative relay are in an open state, the external power supply stops discharging the battery pack.

[0073] Preferably, the high voltage control module further comprises a pre-charging relay and a pre-charging resistor;

[0074] One end of the pre-charging relay is electrically connected to the first input end of the heating circuit, the other end of the pre-charging relay is electrically connected to one end of the pre-charging resistor, and the other end of the pre-charging resistor is electrically connected to the discharge high voltage positive end. By providing the pre-charging relay and the pre-charging resistor, the capacitor at the front end of the motor can be charged when the battery pack discharges the vehicle.

[0075] Preferably, the heating circuit comprises a heating positive relay and a heating negative relay;

[0076] One end of the heating positive relay is electrically connected to the other end of the charging positive relay, the other end of the discharging positive relay and the high voltage positive end of the battery, and the other end of the heating positive relay is electrically connected to the heating output end;

[0077] One end of the heating negative relay is electrically connected to the other end of the charging negative relay, the other end of the charging negative relay and the high voltage negative end of the battery, respectively, and the other end of the heating negative relay is electrically connected to the heating output end. By arranging a heating positive relay and a heating negative relay in the heating circuit, the function of starting or stopping the heating of the battery pack can be realized, that is, when the heating positive relay and the heating negative relay are both in a closed state, the battery pack is heated; when the heating positive relay and / or the heating negative relay are in an open state, the heating of the battery pack is stopped.

[0078] Preferably, the heating circuit further comprises a first overload protection switch and a second overload protection switch;

[0079] One end of the first overload protection switch is electrically connected to the other end of the heating positive relay, and the other end of the first overload protection switch is electrically connected to the heating output end;

[0080] One end of the second overload protection switch is electrically connected to the other end of the heating negative relay, and the other end of the second overload protection switch is electrically connected to the heating output end. By arranging the first overload protection switch and the second overload protection switch in the heating circuit, overheat protection of the heating circuit can be achieved, that is, when overheating occurs in the heating circuit, the first overload protection switch and / or the second overload protection switch will automatically disconnect to cut off the heating circuit to avoid continued heating.

[0081] Preferably, the charging and discharging device further includes a low voltage signal control module;

[0082] The high-voltage control module further includes a command receiving terminal, and the battery pack further includes a low-voltage interface terminal;

[0083] The low-voltage signal control module is electrically connected to the heating circuit via the instruction receiving end, and the low-voltage signal control module is communicatively connected to the low-voltage interface end;

[0084] The low-voltage signal control module is used to collect temperature data corresponding to the battery pack through the low-voltage interface end, compare the temperature data with a set threshold, and generate a first trigger instruction when the temperature data is less than the set threshold and send it to the instruction receiving end to trigger the heating positive relay and the heating negative relay to close;

[0085] Wherein, when the heating positive relay and the heating negative relay are both closed, the heating circuit is used to heat the battery pack. By setting a low-voltage signal control module in the charging and discharging device, the temperature value of the battery pack can be monitored in real time, and the heating function is automatically turned on when the temperature value is less than the set value, that is, the automation of the heating function is realized, ensuring the timeliness of heating the battery pack.

[0086] Preferably, when the battery pack is heated, the low-voltage signal control module is further used to generate a second trigger instruction when the temperature data is greater than or equal to the set threshold and send it to the instruction receiving end to trigger the heating positive relay and the heating negative relay to be disconnected;

[0087] Wherein, when the heating positive relay and the heating negative relay are both disconnected, the heating circuit is used to stop heating the battery pack. When the low-voltage signal control module detects that the temperature value of the battery pack is greater than or equal to the set value, the heating function is automatically stopped, thereby avoiding the waste of electric energy resources and also avoiding the overheating of the battery pack.

[0088] Preferably, the high voltage control module further comprises a circuit breaker;

[0089] One end of the circuit breaker is electrically connected to one end of the heating positive relay, and the other end of the circuit breaker is electrically connected to the high voltage positive terminal of the battery. The circuit breaker is arranged in the main circuit of the charging and discharging device to facilitate disconnecting the main circuit during the actual maintenance process; in addition, the circuit breaker is built with a fuse to play the function of circuit breaker protection.

[0090] And / or, the high voltage control module further includes a current sensor;

[0091] One end of the current sensor is electrically connected to one end of the heating negative relay, and the other end of the current sensor is electrically connected to the high voltage negative terminal of the battery. The arrangement of the current sensor facilitates monitoring of the corresponding charging current when the battery pack is charged. The present invention also provides an electric vehicle, comprising the above-mentioned discharge device of the battery pack, or the above-mentioned charge and discharge device of the battery pack.

[0092] The present invention also provides a battery charging and swapping station, wherein the charging station includes the charging device of the above-mentioned battery pack, or the charging and discharging device of the above-mentioned battery pack.

[0093] The present invention also provides a battery swap station, which includes the above-mentioned charging and swapping compartment.

[0094] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0095] The positive and progressive effects of the present invention are:

[0096] In the present invention, a heating circuit and a heating output terminal are provided in the charging device, the discharging device and the charging and discharging device of the battery pack. The heating circuit can be electrically connected to multiple battery packs at the same time to realize synchronous heating of the multiple battery packs while the battery packs are charging and discharging. In addition, the temperature data of the battery pack can be collected in real time through the low-voltage signal control module. When the temperature data is lower than the set threshold, the heating circuit is automatically controlled to start in time to perform the synchronous heating function on the multiple battery packs, thereby effectively improving the heating efficiency and reducing the heating cost. In addition, the heating circuit also has the advantages of simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0097] Figure 1 It is a schematic diagram of the structure of the charging device of the battery pack according to the first embodiment of the present invention.

[0098] Figure 2 Schematic diagram of the connection between the charging device and the battery pack of the battery pack according to Embodiment 1 of the present invention.

[0099] Figure 3 This is a circuit structure diagram of a charging device for a battery pack according to Embodiment 2 of the present invention.

[0100] Figure 4 Schematic diagram of the structure of the discharge device of the battery pack of embodiment 3 of the present invention.

[0101] Figure 5 Schematic diagram of the connection between the discharge device and the battery pack of the battery pack of embodiment 3 of the present invention.

[0102] Figure 6 This is a circuit structure diagram of the discharge device of the battery pack according to embodiment 4 of the present invention.

[0103] Figure 7 It is a schematic diagram of the structure of the charging and discharging device of the battery pack of embodiment 5 of the present invention.

[0104] Figure 8 Schematic diagram of the connection between the charging and discharging device of the battery pack and the battery pack of embodiment 5 of the present invention.

[0105] Fig. 9 This is a circuit structure diagram of the charging and discharging device of the battery pack of embodiment 6 of the present invention. DETAILED DESCRIPTION

[0106] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0107] Example 1

[0108] like Figure 1As shown, the charging device of the battery pack in this embodiment includes a high-voltage control module 1, and the high-voltage control module 1 includes a first high-voltage terminal 2, a second high-voltage terminal 3, a charging circuit 4, a heating circuit 5 and a heating output terminal 6.

[0109] The first high-voltage terminal 2 and the second high-voltage terminal 3 are electrically connected via a charging circuit 4 , one end of a heating circuit 5 is electrically connected to the charging circuit 4 , and the other end of the heating circuit 5 is electrically connected to a heating output terminal 6 .

[0110] The battery pack of this embodiment includes a high-voltage terminal 7 and a heating terminal 8 , and the heating terminal 8 is electrically connected to the heating film in the battery pack.

[0111] like Figure 2 As shown, the first high-voltage terminal 2 is electrically connected to the external power supply, the second high-voltage terminal 3 is electrically connected to the high-voltage terminal 7 of the battery pack, and the heating output terminal 6 is electrically connected to the heating terminal 8 of the battery pack;

[0112] When the charging circuit 4 is used to charge the battery pack, the heating circuit 5 is used to heat the battery pack. By providing a heating circuit in the charging device, the battery pack can be heated in a low temperature environment so that it can quickly reach a more ideal temperature range for charging, thereby improving the charging efficiency and reducing the impact of temperature on the battery pack charging.

[0113] The charging device of this embodiment can be connected to multiple battery packs to achieve synchronous heating operations on one or more battery packs while charging them, thereby avoiding the situation where the actual usage requirements are not met due to the battery temperature being too low, thereby effectively improving the heating efficiency of the battery pack.

[0114] In the present embodiment, a heating circuit and a heating output terminal are provided in the charging device of the battery pack. The heating circuit can be electrically connected to a plurality of battery packs at the same time to achieve synchronous heating of the battery packs while charging the battery packs, thereby effectively improving the heating efficiency and reducing the heating cost. In addition, the heating circuit in the charging device also has the advantages of simple structure and low cost.

[0115] Example 2

[0116] The battery pack charging device of this embodiment is a further improvement on the embodiment 1, specifically:

[0117] like Figure 3As shown, the first high-voltage terminal 2 includes a charging high-voltage positive terminal 9 and a charging high-voltage negative terminal 10, the second high-voltage terminal 3 includes a battery high-voltage positive terminal 11 and a battery high-voltage negative terminal 12, and the high-voltage terminal 7 includes a high-voltage positive terminal 13 and a high-voltage negative terminal 14. The battery high-voltage positive terminal 11 is electrically connected to the high-voltage positive terminal 13, and the battery high-voltage negative terminal 12 is electrically connected to the high-voltage negative terminal 14. The arrangement of each terminal can realize a fast electrical connection between the battery pack, the charging device and the external power supply, which is convenient for actual on-site operation while ensuring the stability and safety of the connection.

[0118] The charging circuit 4 of this embodiment includes a charging positive relay 15 and a charging negative relay 16, one end of the charging positive relay 15 is electrically connected to the charging high-voltage positive terminal 9, and the other end of the charging positive relay 15 is electrically connected to the first input terminal of the heating circuit 5 and the battery high-voltage positive terminal 11 respectively; one end of the charging negative relay 16 is electrically connected to the charging high-voltage negative terminal 10, and the other end of the charging negative relay 16 is electrically connected to the second input terminal of the heating circuit 5 and the battery high-voltage negative terminal 12 respectively.

[0119] By setting a charging positive relay and a charging negative relay in the charging device, the function of charging or stopping charging the battery pack can be realized, that is, when the charging positive relay and the charging negative relay are both in the closed state, the external power supply charges the battery pack; when the charging positive relay and / or the charging negative relay are in the open state, the external power supply stops charging the battery pack.

[0120] Specifically, the heating circuit 5 includes a heating positive relay 17 , a heating negative relay 18 , a first overload protection switch 19 and a second overload protection switch 20 .

[0121] One end of the heating positive relay 17 is electrically connected to the other end of the charging positive relay 15 and the battery high voltage positive terminal 11 respectively, the other end of the heating positive relay 17 is electrically connected to one end of the first overload protection switch 19, and the other end of the first overload protection switch 19 is electrically connected to the heating output terminal 6;

[0122] One end of the heating negative relay 18 is electrically connected to the other end of the charging negative relay 16 and the battery high voltage negative terminal 12 respectively, the other end of the heating negative relay 18 is electrically connected to one end of the second overload protection switch 20, and the other end of the second overload protection switch 20 is electrically connected to the heating output terminal 6.

[0123] By setting a heating positive relay and a heating negative relay in the heating circuit, the heating function of the battery pack can be turned on or off, that is, the battery pack is heated when the heating positive relay and the heating negative relay are both in the closed state; when the heating positive relay and / or the heating negative relay are in the open state, the heating of the battery pack is stopped.

[0124] By setting a first overload protection switch and a second overload protection switch in the heating circuit, overheating protection of the heating circuit can be achieved. That is, when overheating occurs in the heating circuit, the first overload protection switch and / or the second overload protection switch will automatically disconnect to cut off the heating circuit to avoid continued heating.

[0125] The high voltage control module 1 of this embodiment further includes a circuit breaker 24 and a current sensor 25 .

[0126] Among them, one end of the circuit breaker 24 is electrically connected to one end of the heating positive relay 17, and the other end of the circuit breaker 24 is electrically connected to the battery high voltage positive terminal 11. The circuit breaker is set in the main circuit of the charging device to facilitate disconnecting the main circuit during the actual maintenance process; in addition, the circuit breaker is built with a fuse, which can play the function of circuit breaker protection. One end of the current sensor 25 is electrically connected to one end of the heating negative relay 18 and one end of the charging negative relay 16, respectively, and the other end of the current sensor 25 is electrically connected to the battery high voltage negative terminal 12. The setting of the current sensor facilitates the monitoring of the corresponding charging current size when the battery pack is charged.

[0127] In addition, the charging device of this embodiment further includes a low-voltage signal control module 21 , the high-voltage control module 1 further includes a command receiving terminal 22 , and the battery pack further includes a low-voltage interface terminal 23 .

[0128] The low-voltage signal control module 21 is electrically connected to the heating circuit 5 via the instruction receiving terminal 22 , and the low-voltage signal control module 21 is communicatively connected to the low-voltage interface terminal 23 .

[0129] The low-voltage signal control module 21 is used to collect the temperature data corresponding to the battery pack through the low-voltage interface terminal 23. Specifically, the battery pack is provided with a temperature sensor (such as a thermocouple, an optical fiber temperature sensor, etc.), and the temperature data of the battery pack is obtained through the temperature sensor, and the temperature data is transmitted to the BMS (battery pack management system) of the battery pack. The low-voltage signal control module 21 obtains the temperature data of the battery pack through the low-voltage interface terminal 23 that is connected to the BMS of the battery pack. Then the temperature data is compared with the set threshold value. When the temperature data is less than the set threshold value, a first trigger instruction is generated and sent to the instruction receiving terminal 22 to trigger the heating positive relay 17 and the heating negative relay 18 to close;

[0130] Among them, when the heating positive relay 17 and the heating negative relay 18 are both closed, the heating circuit 5 is used to heat the battery pack, that is, the temperature value of the battery pack is detected in real time through low-voltage signal control, and the heating function of the battery pack is automatically turned on in real time when it is lower than a certain temperature value, that is, the automation of the heating function is realized, which ensures the timeliness of the heating of the battery pack, further improves the heating efficiency, and enhances the charging performance of the battery pack.

[0131] When the battery pack is heated, the low voltage signal control module 21 is also used to generate a second trigger instruction when the temperature data is greater than or equal to a set threshold and send it to the instruction receiving end 22 to trigger the heating positive relay 17 and the heating negative relay 18 to be disconnected;

[0132] Among them, when the heating positive relay 17 and the heating negative relay 18 are both disconnected, the heating circuit 5 is used to stop heating the battery pack, that is, the temperature value of the battery pack is detected in real time through low-voltage signal control, and the heating function of the battery pack is automatically disconnected in real time when the temperature after heating is higher than a certain temperature value, thereby avoiding the waste of electric energy resources and overheating of the battery pack.

[0133] In this embodiment, when the charging device charges the battery pack, the temperature data of the battery pack is collected in real time through the low-voltage signal control module. When the temperature data is lower than the set threshold, the heating circuit is automatically controlled to start in time to perform the synchronous heating function on multiple battery packs, thereby effectively improving the heating efficiency and reducing the heating cost. In addition, the heating circuit also has the advantages of simple structure and low cost.

[0134] Example 3

[0135] like Figure 4 As shown, the discharge device of the battery pack in this embodiment also includes a high-voltage control module 1, and the high-voltage control module 1 includes a first high-voltage terminal 2, a second high-voltage terminal 3, a discharge circuit 26, a heating circuit 5 and a heating output terminal 6.

[0136] The first high-voltage terminal 2 and the second high-voltage terminal 3 are electrically connected via a discharge circuit 26, one end of the heating circuit 5 is electrically connected to the discharge circuit 26, and the other end of the heating circuit 5 is electrically connected to the heating output terminal 6;

[0137] The battery pack of this embodiment includes a high-voltage terminal 7 and a heating terminal 8 , and the heating terminal 8 is electrically connected to the heating film in the battery pack.

[0138] like Figure 5 As shown, the first high-voltage terminal 2 is electrically connected to an external device, the second high-voltage terminal 3 is electrically connected to a high-voltage terminal 7 of the battery pack, and the heating output terminal 6 is electrically connected to a heating terminal 8 of the battery pack.

[0139] Among them, when the discharge circuit 26 is used to supply power to an external device, the heating circuit 5 is used to heat the battery pack. By providing a heating circuit in the discharge device, the battery pack can be heated in a low temperature environment so that it can quickly reach a more ideal temperature range for discharge, improve the discharge efficiency, and reduce the impact of temperature on the discharge of the battery pack. The discharge device of this embodiment can be connected to multiple battery packs to achieve synchronous heating operations while discharging one or more battery packs, thereby avoiding the situation where the actual use requirements are not met due to the battery temperature being too low, thereby effectively improving the heating efficiency of the battery pack.

[0140] In this embodiment, a heating circuit and a heating output terminal are provided in the discharge device of the battery pack. The heating circuit can be electrically connected to multiple battery packs at the same time to achieve synchronous heating of the battery pack while discharging to an external device, thereby effectively improving the heating efficiency and reducing the heating cost. In addition, the heating circuit in the charging device also has the advantages of simple structure and low cost.

[0141] Example 4

[0142] The discharge device of the battery pack of this embodiment is a further improvement on the embodiment 3, specifically:

[0143] like Figure 6 As shown, the first high-voltage terminal 2 includes a discharge high-voltage positive terminal 90 and a discharge high-voltage negative terminal 100, the second high-voltage terminal 3 includes a battery high-voltage positive terminal 11 and a battery high-voltage negative terminal 12, and the high-voltage terminal 7 includes a high-voltage positive terminal 13 and a high-voltage negative terminal 14; the arrangement of each terminal can realize a fast electrical connection between a battery pack, a charging device and an external power source, while facilitating actual on-site operation and ensuring the stability and safety of the connection.

[0144] The battery high voltage positive terminal 11 is electrically connected to the high voltage positive wiring terminal 13 , and the battery high voltage negative terminal 12 is electrically connected to the high voltage negative wiring terminal 14 .

[0145] The discharge circuit 26 of this embodiment includes a discharge positive relay 27 and a discharge negative relay 28, one end of the discharge positive relay 27 is electrically connected to the discharge high voltage positive terminal 90, and the other end of the discharge positive relay 27 is electrically connected to the first input terminal of the heating circuit 5 and the battery high voltage positive terminal 11; one end of the discharge negative relay 28 is electrically connected to the discharge high voltage negative terminal 100, and the other end of the discharge negative relay 28 is electrically connected to the second input terminal of the heating circuit 5 and the battery high voltage negative terminal 12.

[0146] By arranging a discharge positive relay and a discharge negative relay in the discharge device, the function of discharging or stopping the discharge of the battery pack can be realized, that is, when the discharge positive relay and the discharge negative relay are both in the closed state, the external power supply discharges the battery pack; when the discharge positive relay and / or the discharge negative relay are in the open state, the external power supply stops discharging the battery pack.

[0147] The high-voltage control module 1 also includes a pre-charging relay 29 and a pre-charging resistor 30, one end of the pre-charging relay 29 is electrically connected to the first input end of the heating circuit 5, the other end of the pre-charging relay 29 is electrically connected to one end of the pre-charging resistor 30, and the other end of the pre-charging resistor 30 is electrically connected to the discharge high-voltage positive terminal 90.

[0148] By setting the pre-charging relay and pre-charging resistor, the capacitor at the front end of the motor can be charged before the battery pack discharges the vehicle, that is, before starting the motor. When the voltage of the capacitor is close to the battery pack voltage, the battery pack and the motor are connected to prevent damage to the motor.

[0149] Specifically, the heating circuit 5 includes a heating positive relay 17 , a heating negative relay 18 , a first overload protection switch 19 and a second overload protection switch 20 .

[0150] Among them, one end of the heating positive relay 17 is electrically connected to the other end of the discharge positive relay 27 and the battery high voltage positive terminal 11 respectively, the other end of the heating positive relay 17 is electrically connected to one end of the first overload protection switch 19, and the other end of the first overload protection switch 19 is electrically connected to the heating output terminal 6;

[0151] One end of the heating negative relay 18 is electrically connected to the other end of the discharging negative relay 28 and the battery high voltage negative terminal 12 respectively, the other end of the heating negative relay 18 is electrically connected to one end of the second overload protection switch 20, and the other end of the second overload protection switch 20 is electrically connected to the heating output terminal 6.

[0152] By setting a heating positive relay and a heating negative relay in the heating circuit, the heating function of the battery pack can be turned on or off, that is, the battery pack is heated when the heating positive relay and the heating negative relay are both in the closed state; when the heating positive relay and / or the heating negative relay are in the open state, the heating of the battery pack is stopped.

[0153] By providing a first overload protection switch and a second overload protection switch in the heating circuit, overheat protection of the heating circuit is realized, that is, when overheating occurs in the heating circuit, the first overload protection switch and / or the second overload protection switch will automatically disconnect to cut off the heating circuit to avoid continued heating. The high-voltage control module 1 of this embodiment also includes a circuit breaker 24 and a current sensor 25.

[0154] Among them, one end of the circuit breaker 24 is electrically connected to one end of the heating positive relay 17, and the other end of the circuit breaker 24 is electrically connected to the battery high voltage positive terminal 11. The circuit breaker is arranged in the main circuit of the discharge device to facilitate disconnecting the main circuit during the actual maintenance process; in addition, the circuit breaker is built with a fuse, which can play the function of circuit breaker protection.

[0155] One end of the current sensor 25 is electrically connected to one end of the heating negative relay 18, and the other end of the current sensor 25 is electrically connected to the battery high voltage negative terminal 12. The setting of the current sensor facilitates the monitoring of the corresponding discharge current size when the battery pack is discharged.

[0156] In addition, the charging device of this embodiment further includes a low-voltage signal control module 21 , the high-voltage control module 1 further includes a command receiving terminal 22 , and the battery pack further includes a low-voltage interface terminal 23 .

[0157] The low-voltage signal control module 21 is electrically connected to the heating circuit 5 via the instruction receiving terminal 22, and the low-voltage signal control module 21 is communicatively connected to the low-voltage interface terminal 23;

[0158] The low-voltage signal control module 21 is used to collect the temperature data corresponding to the battery pack through the low-voltage interface terminal 23. Specifically, the battery pack is provided with a temperature sensor (such as a thermocouple, an optical fiber temperature sensor, etc.), and the temperature data of the battery pack is obtained through the temperature sensor, and the temperature data is transmitted to the BMS (battery pack management system) of the battery pack. The low-voltage signal control module 21 obtains the temperature data of the battery pack through the low-voltage interface terminal 23 that is connected to the BMS of the battery pack. Then the temperature data is compared with the set threshold value. When the temperature data is less than the set threshold value, a first trigger instruction is generated and sent to the instruction receiving terminal 22 to trigger the heating positive relay 17 and the heating negative relay 18 to close;

[0159] Among them, when the heating positive relay 17 and the heating negative relay 18 are both closed, the heating circuit 5 is used to heat the battery pack, that is, the temperature value of the battery pack is detected in real time through low-voltage signal control, and the heating function is automatically turned on when it is lower than a certain temperature value, that is, the heating function is automated, ensuring the timeliness of the heating of the battery pack.

[0160] When the battery pack is heated, the low-voltage signal control module 21 is also used to generate a second trigger instruction when the temperature data is greater than or equal to a set threshold and send it to the instruction receiving end 22 to trigger the heating positive relay 17 and the heating negative relay 18 to be disconnected, that is, the temperature value of the battery pack is detected in real time through low-voltage signal control, and the heating function is automatically stopped when the temperature after heating is higher than a certain temperature value, thereby avoiding waste of electric energy resources and overheating of the battery pack.

[0161] When the heating positive relay 17 and the heating negative relay 18 are both disconnected, the heating circuit 5 is used to stop heating the battery pack.

[0162] In this embodiment, when the discharge device discharges to an external device, the temperature data of the battery pack is collected in real time through the low-voltage signal control module. When the temperature data is lower than the set threshold, the heating circuit is automatically controlled to start in time to perform synchronous heating function on multiple battery packs, thereby effectively improving the heating efficiency and reducing the heating cost. In addition, the heating circuit also has the advantages of simple structure and low cost.

[0163] Example 5

[0164] like Figure 7 As shown, the charging and discharging device of the battery pack of this embodiment includes a high-voltage control module 1, and the high-voltage control module 1 includes a first high-voltage terminal 2, a second high-voltage terminal 3, a charging circuit 4, a discharging circuit 26, a heating circuit 5 and a heating output terminal 6.

[0165] The battery pack of this embodiment includes a high-voltage terminal 7 and a heating terminal 8 , and the heating terminal 8 is electrically connected to the heating film in the battery pack.

[0166] like Figure 8 As shown, when the charging and discharging device is in a charging state, the first high-voltage terminal 2 and the second high-voltage terminal 3 are electrically connected through the charging circuit 4, one end of the heating circuit 5 is electrically connected to the charging circuit 4, and the other end of the heating circuit 5 is electrically connected to the heating output terminal 6; the first high-voltage terminal 2 is electrically connected to an external power source, the second high-voltage terminal 3 is electrically connected to the high-voltage terminal 7 of the battery pack, and the heating output terminal 6 is electrically connected to the heating terminal 8 of the battery pack;

[0167] Among them, when the charging circuit 4 is used to charge the battery pack, the heating circuit 5 is used to heat the battery pack; that is, the battery pack can be heated in a low temperature environment so that it can quickly reach a more ideal temperature range for charging, thereby improving the charging efficiency and reducing the impact of temperature on the battery pack charging.

[0168] When the charging and discharging device is in a discharging state, the first high-voltage terminal 2 and the second high-voltage terminal 3 are electrically connected through the discharge circuit 26, one end of the heating circuit 5 is electrically connected to the discharge circuit 26, and the other end of the heating circuit 5 is electrically connected to the heating output terminal 6; the first high-voltage terminal 2 is electrically connected to an external device, the second high-voltage terminal 3 is electrically connected to the high-voltage terminal 7 of the battery pack, and the heating output terminal 6 is electrically connected to the heating terminal 8 of the battery pack.

[0169] Among them, when the discharge circuit 26 is used to supply power to an external device, the heating circuit 5 is used to heat the battery pack. That is, the battery pack can be heated in a low temperature environment so that it can quickly reach a more ideal temperature range for discharge, improve the discharge efficiency, and reduce the impact of temperature on the discharge of the battery pack. The charging and discharging device of this embodiment can be connected to multiple battery packs to achieve synchronous heating of the battery pack while charging one or more battery packs or discharging to an external device, thereby avoiding the situation where the actual use requirements are not met due to the battery temperature being too low, thereby effectively improving the heating efficiency of the battery pack.

[0170] In the present embodiment, a heating circuit and a heating output terminal are provided in the charging and discharging device of the battery pack. The heating circuit can be electrically connected to a plurality of battery packs at the same time to achieve synchronous heating of the battery pack while charging the battery pack or discharging to an external device, thereby effectively improving the heating efficiency and reducing the heating cost. In addition, the heating circuit in the charging device also has the advantages of simple structure and low cost.

[0171] Example 6

[0172] The charging and discharging device of the battery pack of this embodiment is a further improvement on the embodiment 5, specifically:

[0173] like Fig. 9 As shown, when the charging and discharging device is in a charging state, the first high-voltage terminal 2 includes a charging high-voltage positive terminal 9 and a charging high-voltage negative terminal 10. When the charging and discharging device is in a discharging state, the first high-voltage terminal 2 includes a discharging high-voltage positive terminal 90 and a discharging high-voltage negative terminal 100. The arrangement of each terminal can realize a fast electrical connection between the battery pack, the charging device and the external power supply, and ensure the stability and safety of the connection while facilitating actual on-site operation.

[0174] The second high-voltage terminal 3 includes a battery high-voltage positive terminal 11 and a battery high-voltage negative terminal 12, and the high-voltage terminal 7 includes a high-voltage positive terminal 13 and a high-voltage negative terminal 14;

[0175] The battery high voltage positive terminal 11 is electrically connected to the high voltage positive wiring terminal 13 , and the battery high voltage negative terminal 12 is electrically connected to the high voltage negative wiring terminal 14 .

[0176] The charging circuit 4 of this embodiment includes a charging positive relay 15 and a charging negative relay 16, one end of the charging positive relay 15 is electrically connected to the charging high-voltage positive terminal 9, and the other end of the charging positive relay 15 is electrically connected to the first input end of the heating circuit 5 and the battery high-voltage positive terminal 11 respectively; one end of the charging negative relay 16 is electrically connected to the charging high-voltage negative terminal 10, and the other end of the charging negative relay 16 is electrically connected to the second input end of the heating circuit 5 and the battery high-voltage negative terminal 12 respectively; by arranging the charging positive relay and the charging negative relay in the charging device, the function of charging or stopping charging of the battery pack is realized, that is, when the charging positive relay and the charging negative relay are both in a closed state, the external power supply charges the battery pack; when the charging positive relay and / or the charging negative relay are in a disconnected state, the external power supply stops charging the battery pack.

[0177] The discharge circuit 26 of this embodiment includes a discharge positive relay 27 and a discharge negative relay 28, one end of the discharge positive relay 27 is electrically connected to the discharge high voltage positive terminal 90, and the other end of the discharge positive relay 27 is electrically connected to the first input terminal of the heating circuit 5 and the battery high voltage positive terminal 11; one end of the discharge negative relay 28 is electrically connected to the discharge high voltage negative terminal 100, and the other end of the discharge negative relay 28 is electrically connected to the second input terminal of the heating circuit 5 and the battery high voltage negative terminal 12.

[0178] By arranging a discharge positive relay and a discharge negative relay in the discharge device, the function of discharging or stopping the discharge of the battery pack can be realized, that is, when the discharge positive relay and the discharge negative relay are both in the closed state, the external power supply discharges the battery pack; when the discharge positive relay and / or the discharge negative relay are in the open state, the external power supply stops discharging the battery pack.

[0179] When the charging and discharging device is in the discharging state, the high-voltage control module 1 also includes a pre-charging relay 29 and a pre-charging resistor. One end of the pre-charging relay 29 is electrically connected to the first input end of the heating circuit 5, and the other end of the pre-charging relay 29 is electrically connected to one end of the pre-charging resistor 30. The other end of the pre-charging resistor 30 is electrically connected to the discharge high-voltage positive terminal 90.

[0180] By setting the pre-charging relay and pre-charging resistor, the capacitor at the front end of the motor can be charged before the battery pack discharges the vehicle, that is, before starting the motor. When the voltage of the capacitor is close to the battery pack voltage, the battery pack and the motor are connected to prevent damage to the motor.

[0181] Specifically, the heating circuit 5 of the present embodiment includes a heating positive relay 17 , a heating negative relay 18 , a first overload protection switch 19 and a second overload protection switch 20 .

[0182] When the charging and discharging device is in a charging state, one end of the heating positive relay 17 is electrically connected to the other end of the charging positive relay 15 and the battery high voltage positive terminal 11 respectively, the other end of the heating positive relay 17 is electrically connected to one end of the first overload protection switch 19, and the other end of the first overload protection switch 19 is electrically connected to the heating output terminal 6;

[0183] One end of the heating negative relay 18 is electrically connected to the other end of the charging negative relay 16 and the battery high voltage negative terminal 12 respectively, the other end of the heating negative relay 18 is electrically connected to one end of the second overload protection switch 20, and the other end of the second overload protection switch 20 is electrically connected to the heating output terminal 6.

[0184] When the charging and discharging device is in the discharging state, one end of the heating positive relay 17 is electrically connected to the other end of the discharging positive relay 27 and the battery high voltage positive terminal 11 respectively, the other end of the heating positive relay 17 is electrically connected to one end of the first overload protection switch 19, and the other end of the first overload protection switch 19 is electrically connected to the heating output terminal 6;

[0185] One end of the heating negative relay 18 is electrically connected to the other end of the discharging negative relay 28 and the battery high voltage negative terminal 12 respectively, the other end of the heating negative relay 18 is electrically connected to one end of the second overload protection switch 20, and the other end of the second overload protection switch 20 is electrically connected to the heating output terminal 6.

[0186] By setting a heating positive relay and a heating negative relay in the heating circuit, the heating function of the battery pack can be turned on or off, that is, the battery pack is heated when the heating positive relay and the heating negative relay are both in the closed state; when the heating positive relay and / or the heating negative relay are in the open state, the heating of the battery pack is stopped.

[0187] By setting a first overload protection switch and a second overload protection switch in the heating circuit, overheating protection of the heating circuit can be achieved. That is, when overheating occurs in the heating circuit, the first overload protection switch and / or the second overload protection switch will automatically disconnect to cut off the heating circuit to avoid continued heating.

[0188] The charging device of this embodiment further includes a low-voltage signal control module 21 , the high-voltage control module 1 further includes a command receiving terminal 22 , and the battery pack further includes a low-voltage interface terminal 23 .

[0189] The low-voltage signal control module 21 is electrically connected to the heating circuit 5 via the instruction receiving terminal 22, and the low-voltage signal control module 21 is communicatively connected to the low-voltage interface terminal 23;

[0190] The low-voltage signal control module 21 is used to collect the temperature data corresponding to the battery pack through the low-voltage interface terminal 23. Specifically, the battery pack is provided with a temperature sensor (such as a thermocouple, an optical fiber temperature sensor, etc.), and the temperature data of the battery pack is obtained through the temperature sensor, and the temperature data is transmitted to the BMS (battery pack management system) of the battery pack. The low-voltage signal control module 21 obtains the temperature data of the battery pack through the low-voltage interface terminal 23 that is connected to the BMS of the battery pack. Then the temperature data is compared with the set threshold value. When the temperature data is less than the set threshold value, a first trigger instruction is generated and sent to the instruction receiving terminal 22 to trigger the heating positive relay 17 and the heating negative relay 18 to close;

[0191] Among them, when the heating positive relay 17 and the heating negative relay 18 are both closed, the heating circuit 5 is used to heat the battery pack, that is, the temperature value of the battery pack is detected in real time through low-voltage signal control, and the heating function is automatically turned on when it is lower than a certain temperature value, that is, the heating function is automated, ensuring the timeliness of the heating of the battery pack.

[0192] When the battery pack is heated, the low voltage signal control module 21 is also used to generate a second trigger instruction when the temperature data is greater than or equal to a set threshold and send it to the instruction receiving end 22 to trigger the heating positive relay 17 and the heating negative relay 18 to be disconnected;

[0193] Among them, when the heating positive relay 17 and the heating negative relay 18 are both disconnected, the heating circuit 5 is used to stop heating the battery pack, that is, the temperature value of the battery pack is detected in real time through low-voltage signal control, and the heating function is automatically stopped when the temperature after heating is higher than a certain temperature value, thereby avoiding the waste of electric energy resources and overheating of the battery pack.

[0194] In addition, the high voltage control module 1 further includes a circuit breaker 24 and a current sensor 25 .

[0195] Among them, one end of the circuit breaker 24 is electrically connected to one end of the heating positive relay 17, and the other end of the circuit breaker 24 is electrically connected to the battery high voltage positive terminal 11. The circuit breaker is arranged in the main circuit of the charging and discharging device to facilitate disconnecting the main circuit during the actual maintenance process; in addition, the circuit breaker has a built-in fuse, which can play the function of circuit breaker protection.

[0196] One end of the current sensor 25 is electrically connected to one end of the heating negative relay 18, and the other end of the current sensor 25 is electrically connected to the battery high voltage negative terminal 12. The setting of the current sensor facilitates monitoring of the corresponding charging current size when the battery pack is charged.

[0197] In this embodiment, when the charging and discharging device discharges the external equipment or charges the battery pack, the temperature data of the battery pack is collected in real time through the low-voltage signal control module. When the temperature data is lower than the set threshold, the heating circuit is automatically controlled to start in time to perform the synchronous heating function on multiple battery packs, thereby effectively improving the heating efficiency and reducing the heating cost. In addition, the heating circuit has the advantages of simple structure and low cost.

[0198] Example 7

[0199] The electric vehicle of this embodiment includes the discharge device of the battery pack in embodiment 3 or 4, or includes the charge and discharge device of the battery pack in embodiment 5 or 6.

[0200] The electric vehicle of this embodiment includes a discharge device or a charge and discharge device, which can realize synchronous heating of multiple battery packs while charging the battery packs and discharging to external equipment, thereby effectively improving the heating efficiency and the heating performance of the battery packs.

[0201] Example 8

[0202] The charging and swapping compartment of this embodiment includes the charging device of the battery pack in embodiment 1 or 2, or includes the charging and discharging device of the battery pack in embodiment 5 or 6.

[0203] The charging and swapping compartment of this embodiment includes a charging device or a charging and discharging device, which can realize synchronous heating of multiple battery packs while charging the battery packs and discharging to external equipment, thereby effectively improving the heating efficiency and improving the heating performance of the battery packs.

[0204] Example 9

[0205] The battery swap station of this embodiment includes the charging and swapping compartment in Example 8.

[0206] The battery swap station of this embodiment includes a charging and swapping compartment, which includes a charging device or a charging and discharging device, which can realize synchronous heating of multiple battery packs while charging the battery packs and discharging to external equipment, thereby effectively improving the heating efficiency and improving the heating performance of the battery packs.

[0207] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A battery pack charging device, characterized in that: The battery pack includes a high voltage terminal and a heating terminal, and the heating terminal is electrically connected to a heating film in the battery pack; The charging device includes a high-voltage control module, and the high-voltage control module includes a first high-voltage terminal, a second high-voltage terminal, a charging circuit, a heating circuit, and a heating output terminal; the first high-voltage terminal and the second high-voltage terminal are electrically connected through the charging circuit, one end of the heating circuit is electrically connected to the charging circuit, and the other end of the heating circuit is electrically connected to the heating output terminal; The first high-voltage terminal is electrically connected to an external power source, the second high-voltage terminal is electrically connected to the high-voltage terminal of the battery pack, and the heating output terminal is electrically connected to the heating terminal of the battery pack; Wherein, when the charging circuit is used to charge the battery pack, the heating circuit is used to heat the battery pack.

2. The battery pack charging device according to claim 1, characterized in that: The first high-voltage terminal includes a charging high-voltage positive terminal and a charging high-voltage negative terminal, the second high-voltage terminal includes a battery high-voltage positive terminal and a battery high-voltage negative terminal, and the high-voltage terminal includes a high-voltage positive terminal and a high-voltage negative terminal; Wherein, the battery high voltage positive terminal is electrically connected to the high voltage positive terminal, and the battery high voltage negative terminal is electrically connected to the high voltage negative terminal; Preferably, the charging circuit includes a charging positive relay and a charging negative relay; One end of the charging positive relay is electrically connected to the charging high voltage positive terminal, and the other end of the charging positive relay is electrically connected to the first input end of the heating circuit and the battery high voltage positive terminal respectively; One end of the charging negative relay is electrically connected to the charging high-voltage negative terminal, and the other end of the charging negative relay is electrically connected to the second input end of the heating circuit and the battery high-voltage negative terminal.

3. The battery pack charging device according to claim 2, characterized in that: The heating circuit includes a heating positive relay and a heating negative relay; One end of the heating positive relay is electrically connected to the other end of the charging positive relay and the high voltage positive end of the battery, respectively, and the other end of the heating positive relay is electrically connected to the heating output end; One end of the heating negative relay is electrically connected to the other end of the charging negative relay and the high voltage negative end of the battery, respectively, and the other end of the heating negative relay is electrically connected to the heating output end; Preferably, the high voltage control module further includes a circuit breaker; One end of the circuit breaker is electrically connected to one end of the heating positive relay, and the other end of the circuit breaker is electrically connected to the high voltage positive terminal of the battery; and / or, the high voltage control module further includes a current sensor; One end of the current sensor is electrically connected to one end of the heating negative relay and the other end of the charging negative relay respectively, and the other end of the current sensor is electrically connected to the high voltage negative terminal of the battery; And / or, the heating circuit further includes a first overload protection switch and a second overload protection switch; One end of the first overload protection switch is electrically connected to the other end of the heating positive relay, and the other end of the first overload protection switch is electrically connected to the heating output end; One end of the second overload protection switch is electrically connected to the other end of the heating negative relay, and the other end of the second overload protection switch is electrically connected to the heating output end; Preferably, the charging device further includes a low voltage signal control module; The high-voltage control module further includes a command receiving terminal, and the battery pack further includes a low-voltage interface terminal; The low-voltage signal control module is electrically connected to the heating circuit via the instruction receiving end, and the low-voltage signal control module is communicatively connected to the low-voltage interface end; The low-voltage signal control module is used to collect temperature data corresponding to the battery pack through the low-voltage interface end, compare the temperature data with a set threshold, and generate a first trigger instruction when the temperature data is less than the set threshold and send it to the instruction receiving end to trigger the heating positive relay and the heating negative relay to close; Wherein, when the heating positive relay and the heating negative relay are both closed, the heating circuit is used to heat the battery pack; Preferably, when the battery pack is heated, the low-voltage signal control module is further used to generate a second trigger instruction when the temperature data is greater than or equal to the set threshold and send it to the instruction receiving end to trigger the heating positive relay and the heating negative relay to be disconnected; Wherein, when the heating positive relay and the heating negative relay are both disconnected, the heating circuit is used to stop heating the battery pack.

4. A discharge device for a battery pack, characterized in that: The battery pack includes a high voltage terminal and a heating terminal, and the heating terminal is electrically connected to a heating film in the battery pack; The discharge device further includes a high-voltage control module, which includes a first high-voltage terminal, a second high-voltage terminal, a discharge circuit, a heating circuit, and a heating output terminal; the first high-voltage terminal and the second high-voltage terminal are electrically connected through the discharge circuit, one end of the heating circuit is electrically connected to the discharge circuit, and the other end of the heating circuit is electrically connected to the heating output terminal; The first high-voltage terminal is electrically connected to an external device, the second high-voltage terminal is electrically connected to the high-voltage terminal of the battery pack, and the heating output terminal is electrically connected to the heating terminal of the battery pack; Wherein, when the discharge circuit is used to supply power to the external device, the heating circuit is used to heat the battery pack.

5. The discharge device of the battery pack as claimed in claim 4, characterized in that: The first high-voltage terminal includes a discharge high-voltage positive terminal and a discharge high-voltage negative terminal, the second high-voltage terminal includes a battery high-voltage positive terminal and a battery high-voltage negative terminal, and the high-voltage terminal includes a high-voltage positive terminal and a high-voltage negative terminal; Wherein, the battery high voltage positive terminal is electrically connected to the high voltage positive terminal, and the battery high voltage negative terminal is electrically connected to the high voltage negative terminal; Preferably, the discharge circuit comprises a discharge positive relay and a discharge negative relay; One end of the discharge positive relay is electrically connected to the discharge high voltage positive terminal, and the other end of the discharge positive relay is electrically connected to the first input end of the heating circuit and the battery high voltage positive terminal; One end of the discharge negative relay is electrically connected to the discharge high voltage negative terminal, and the other end of the discharge negative relay is electrically connected to the second input end of the heating circuit and the battery high voltage negative terminal; Preferably, the high voltage control module further comprises a pre-charge relay and a pre-charge resistor; One end of the pre-charging relay is electrically connected to the first input end of the heating circuit, the other end of the pre-charging relay is electrically connected to one end of the pre-charging resistor, and the other end of the pre-charging resistor is electrically connected to the discharge high voltage positive end.

6. The discharge device of the battery pack as claimed in claim 5, characterized in that: The heating circuit includes a heating positive relay and a heating negative relay. One end of the heating positive relay is electrically connected to the other end of the discharge positive relay and the high voltage positive end of the battery, respectively, and the other end of the heating positive relay is electrically connected to the heating output end; One end of the heating negative relay is electrically connected to the other end of the discharge negative relay and the high voltage negative end of the battery, respectively, and the other end of the heating negative relay is electrically connected to the heating output end; Preferably, the high voltage control module further includes a circuit breaker; One end of the circuit breaker is electrically connected to one end of the heating positive relay, and the other end of the circuit breaker is electrically connected to the high voltage positive end of the battery; and / or, The high voltage control module also includes a current sensor; One end of the current sensor is electrically connected to one end of the heating negative relay, and the other end of the current sensor is electrically connected to the high voltage negative end of the battery; And / or, the heating circuit further includes a first overload protection switch and a second overload protection switch; One end of the first overload protection switch is electrically connected to the other end of the heating positive relay, and the other end of the first overload protection switch is electrically connected to the heating output end; One end of the second overload protection switch is electrically connected to the other end of the heating negative relay, and the other end of the second overload protection switch is electrically connected to the heating output end; Preferably, the discharge device further includes a low voltage signal control module; The high-voltage control module further includes a command receiving terminal, and the battery pack further includes a low-voltage interface terminal; The low-voltage signal control module is electrically connected to the heating circuit via the instruction receiving end, and the low-voltage signal control module is communicatively connected to the low-voltage interface end; The low-voltage signal control module is used to collect temperature data corresponding to the battery pack through the low-voltage interface end, compare the temperature data with a set threshold, and generate a first trigger instruction when the temperature data is less than the set threshold and send it to the instruction receiving end to trigger the heating positive relay and the heating negative relay to close; Wherein, when the heating positive relay and the heating negative relay are both closed, the heating circuit is used to heat the battery pack; Preferably, when the battery pack is heated, the low-voltage signal control module is further used to generate a second trigger instruction when the temperature data is greater than or equal to the set threshold and send it to the instruction receiving end to trigger the heating positive relay and the heating negative relay to be disconnected; Wherein, when the heating positive relay and the heating negative relay are both disconnected, the heating circuit is used to stop heating the battery pack.

7. A battery pack charging and discharging device, characterized in that: The battery pack includes a high voltage terminal and a heating terminal, and the heating terminal is electrically connected to a heating film in the battery pack; The charging and discharging device comprises a high-voltage control module, and the high-voltage control module comprises a first high-voltage terminal, a second high-voltage terminal, a charging circuit, a discharging circuit, a heating circuit and a heating output terminal; The second high-voltage terminal is electrically connected to the high-voltage terminal of the battery pack, and the heating output terminal is electrically connected to the heating terminal of the battery pack; When the charging and discharging device is in a charging state, the first high-voltage end is electrically connected to an external power source, the first high-voltage end and the second high-voltage end are electrically connected via the charging circuit, one end of the heating circuit is electrically connected to the charging circuit, and the other end of the heating circuit is electrically connected to the heating output end; Wherein, when the charging circuit is used to charge the battery pack, the heating circuit is used to heat the battery pack; When the charging and discharging device is in a discharging state, the first high-voltage end is electrically connected to an external device, the first high-voltage end and the second high-voltage end are electrically connected via the discharging circuit, one end of the heating circuit is electrically connected to the discharging circuit, and the other end of the heating circuit is electrically connected to the heating output end; Wherein, when the discharge circuit is used to supply power to the external device, the heating circuit is used to heat the battery pack.

8. The charging and discharging device of the battery pack according to claim 7, characterized in that: When the charging and discharging device is in a charging state, the first high-voltage end includes a charging high-voltage positive end and a charging high-voltage negative end; When the charging and discharging device is in a discharging state, the first high-voltage end includes a discharging high-voltage positive end and a discharging high-voltage negative end; The second high-voltage terminal includes a battery high-voltage positive terminal and a battery high-voltage negative terminal, and the high-voltage terminal includes a high-voltage positive terminal and a high-voltage negative terminal; Wherein, the battery high voltage positive terminal is electrically connected to the high voltage positive terminal, and the battery high voltage negative terminal is electrically connected to the high voltage negative terminal; Preferably, the charging circuit includes a charging positive relay and a charging negative relay; One end of the charging positive relay is electrically connected to the charging high voltage positive terminal, and the other end of the charging positive relay is electrically connected to the first input end of the heating circuit and the battery high voltage positive terminal respectively; One end of the charging negative relay is electrically connected to the charging high-voltage negative terminal, and the other end of the charging negative relay is electrically connected to the second input end of the heating circuit and the battery high-voltage negative terminal; The discharge circuit includes a discharge positive relay and a discharge negative relay; One end of the discharge positive relay is electrically connected to the discharge high voltage positive terminal, and the other end of the discharge positive relay is electrically connected to the first input end of the heating circuit and the battery high voltage positive terminal; One end of the discharge negative relay is electrically connected to the discharge high voltage negative terminal, and the other end of the discharge negative relay is electrically connected to the second input end of the heating circuit and the battery high voltage negative terminal; Preferably, the high voltage control module further includes a pre-charging relay and a pre-charging resistor; One end of the pre-charging relay is electrically connected to the first input end of the heating circuit, the other end of the pre-charging relay is electrically connected to one end of the pre-charging resistor, and the other end of the pre-charging resistor is electrically connected to the discharge high voltage positive end.

9. The charging and discharging device of the battery pack according to claim 8, characterized in that: The heating circuit includes a heating positive relay and a heating negative relay; One end of the heating positive relay is electrically connected to the other end of the charging positive relay, the other end of the discharging positive relay and the high voltage positive end of the battery, and the other end of the heating positive relay is electrically connected to the heating output end; One end of the heating negative relay is electrically connected to the other end of the charging negative relay, the other end of the charging negative relay and the high voltage negative end of the battery, and the other end of the heating negative relay is electrically connected to the heating output end; Preferably, the high voltage control module further includes a circuit breaker; One end of the circuit breaker is electrically connected to one end of the heating positive relay, and the other end of the circuit breaker is electrically connected to the high voltage positive end of the battery; and / or, The high voltage control module also includes a current sensor; One end of the current sensor is electrically connected to one end of the heating negative relay, and the other end of the current sensor is electrically connected to the high voltage negative end of the battery; And / or, the heating circuit further includes a first overload protection switch and a second overload protection switch; One end of the first overload protection switch is electrically connected to the other end of the heating positive relay, and the other end of the first overload protection switch is electrically connected to the heating output end; One end of the second overload protection switch is electrically connected to the other end of the heating negative relay, and the other end of the second overload protection switch is electrically connected to the heating output end; Preferably, the charging and discharging device further includes a low voltage signal control module; The high-voltage control module further includes a command receiving terminal, and the battery pack further includes a low-voltage interface terminal; The low-voltage signal control module is electrically connected to the heating circuit via the instruction receiving end, and the low-voltage signal control module is communicatively connected to the low-voltage interface end; The low-voltage signal control module is used to collect temperature data corresponding to the battery pack through the low-voltage interface end, compare the temperature data with a set threshold, and generate a first trigger instruction when the temperature data is less than the set threshold and send it to the instruction receiving end to trigger the heating positive relay and the heating negative relay to close; Wherein, when the heating positive relay and the heating negative relay are both closed, the heating circuit is used to heat the battery pack; Preferably, when the battery pack is heated, the low-voltage signal control module is further used to generate a second trigger instruction when the temperature data is greater than or equal to the set threshold and send it to the instruction receiving end to trigger the heating positive relay and the heating negative relay to be disconnected; Wherein, when the heating positive relay and the heating negative relay are both disconnected, the heating circuit is used to stop heating the battery pack.

10. An electric vehicle, characterized in that: The electric vehicle comprises a discharge device for a battery pack as described in any one of claims 4 to 6, or a charge and discharge device for a battery pack as described in any one of claims 7 to 9.

11. A battery charging and swapping warehouse, characterized in that: The charging station comprises a charging device for a battery pack as described in any one of claims 1 to 3, or a charging and discharging device for a battery pack as described in any one of claims 7 to 9.

12. A battery swap station, characterized in that: The battery swap station includes the charging and swapping compartment described in claim 11.

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